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1660 lines
40 KiB
1660 lines
40 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Elan Microelectronics touch panels with I2C interface |
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* |
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* Copyright (C) 2014 Elan Microelectronics Corporation. |
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* Scott Liu <[email protected]> |
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* |
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* This code is partly based on hid-multitouch.c: |
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* |
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* Copyright (c) 2010-2012 Stephane Chatty <[email protected]> |
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* Copyright (c) 2010-2012 Benjamin Tissoires <[email protected]> |
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* Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France |
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* |
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* This code is partly based on i2c-hid.c: |
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* |
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* Copyright (c) 2012 Benjamin Tissoires <[email protected]> |
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* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France |
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* Copyright (c) 2012 Red Hat, Inc |
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*/ |
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#include <linux/bits.h> |
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#include <linux/module.h> |
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#include <linux/input.h> |
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#include <linux/interrupt.h> |
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#include <linux/irq.h> |
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#include <linux/platform_device.h> |
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#include <linux/async.h> |
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#include <linux/i2c.h> |
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#include <linux/delay.h> |
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#include <linux/uaccess.h> |
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#include <linux/buffer_head.h> |
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#include <linux/slab.h> |
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#include <linux/firmware.h> |
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#include <linux/input/mt.h> |
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#include <linux/input/touchscreen.h> |
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#include <linux/acpi.h> |
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#include <linux/of.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/uuid.h> |
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#include <asm/unaligned.h> |
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/* Device, Driver information */ |
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#define DEVICE_NAME "elants_i2c" |
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|
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/* Convert from rows or columns into resolution */ |
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#define ELAN_TS_RESOLUTION(n, m) (((n) - 1) * (m)) |
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|
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/* FW header data */ |
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#define HEADER_SIZE 4 |
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#define FW_HDR_TYPE 0 |
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#define FW_HDR_COUNT 1 |
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#define FW_HDR_LENGTH 2 |
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|
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/* Buffer mode Queue Header information */ |
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#define QUEUE_HEADER_SINGLE 0x62 |
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#define QUEUE_HEADER_NORMAL 0X63 |
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#define QUEUE_HEADER_WAIT 0x64 |
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#define QUEUE_HEADER_NORMAL2 0x66 |
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|
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/* Command header definition */ |
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#define CMD_HEADER_WRITE 0x54 |
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#define CMD_HEADER_READ 0x53 |
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#define CMD_HEADER_6B_READ 0x5B |
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#define CMD_HEADER_ROM_READ 0x96 |
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#define CMD_HEADER_RESP 0x52 |
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#define CMD_HEADER_6B_RESP 0x9B |
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#define CMD_HEADER_ROM_RESP 0x95 |
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#define CMD_HEADER_HELLO 0x55 |
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#define CMD_HEADER_REK 0x66 |
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|
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/* FW position data */ |
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#define PACKET_SIZE_OLD 40 |
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#define PACKET_SIZE 55 |
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#define MAX_CONTACT_NUM 10 |
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#define FW_POS_HEADER 0 |
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#define FW_POS_STATE 1 |
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#define FW_POS_TOTAL 2 |
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#define FW_POS_XY 3 |
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#define FW_POS_TOOL_TYPE 33 |
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#define FW_POS_CHECKSUM 34 |
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#define FW_POS_WIDTH 35 |
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#define FW_POS_PRESSURE 45 |
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#define HEADER_REPORT_10_FINGER 0x62 |
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|
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/* Header (4 bytes) plus 3 full 10-finger packets */ |
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#define MAX_PACKET_SIZE 169 |
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#define BOOT_TIME_DELAY_MS 50 |
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/* FW read command, 0x53 0x?? 0x0, 0x01 */ |
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#define E_ELAN_INFO_FW_VER 0x00 |
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#define E_ELAN_INFO_BC_VER 0x10 |
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#define E_ELAN_INFO_X_RES 0x60 |
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#define E_ELAN_INFO_Y_RES 0x63 |
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#define E_ELAN_INFO_REK 0xD0 |
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#define E_ELAN_INFO_TEST_VER 0xE0 |
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#define E_ELAN_INFO_FW_ID 0xF0 |
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#define E_INFO_OSR 0xD6 |
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#define E_INFO_PHY_SCAN 0xD7 |
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#define E_INFO_PHY_DRIVER 0xD8 |
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/* FW write command, 0x54 0x?? 0x0, 0x01 */ |
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#define E_POWER_STATE_SLEEP 0x50 |
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#define E_POWER_STATE_RESUME 0x58 |
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#define MAX_RETRIES 3 |
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#define MAX_FW_UPDATE_RETRIES 30 |
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#define ELAN_FW_PAGESIZE 132 |
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/* calibration timeout definition */ |
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#define ELAN_CALI_TIMEOUT_MSEC 12000 |
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#define ELAN_POWERON_DELAY_USEC 500 |
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#define ELAN_RESET_DELAY_MSEC 20 |
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enum elants_chip_id { |
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EKTH3500, |
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EKTF3624, |
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}; |
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enum elants_state { |
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ELAN_STATE_NORMAL, |
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ELAN_WAIT_QUEUE_HEADER, |
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ELAN_WAIT_RECALIBRATION, |
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}; |
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enum elants_iap_mode { |
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ELAN_IAP_OPERATIONAL, |
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ELAN_IAP_RECOVERY, |
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}; |
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/* struct elants_data - represents state of Elan touchscreen device */ |
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struct elants_data { |
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struct i2c_client *client; |
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struct input_dev *input; |
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struct regulator *vcc33; |
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struct regulator *vccio; |
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struct gpio_desc *reset_gpio; |
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u16 fw_version; |
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u8 test_version; |
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u8 solution_version; |
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u8 bc_version; |
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u8 iap_version; |
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u16 hw_version; |
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u8 major_res; |
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unsigned int x_res; /* resolution in units/mm */ |
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unsigned int y_res; |
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unsigned int x_max; |
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unsigned int y_max; |
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unsigned int phy_x; |
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unsigned int phy_y; |
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struct touchscreen_properties prop; |
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enum elants_state state; |
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enum elants_chip_id chip_id; |
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enum elants_iap_mode iap_mode; |
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/* Guards against concurrent access to the device via sysfs */ |
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struct mutex sysfs_mutex; |
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u8 cmd_resp[HEADER_SIZE]; |
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struct completion cmd_done; |
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bool wake_irq_enabled; |
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bool keep_power_in_suspend; |
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/* Must be last to be used for DMA operations */ |
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u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned; |
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}; |
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static int elants_i2c_send(struct i2c_client *client, |
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const void *data, size_t size) |
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{ |
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int ret; |
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ret = i2c_master_send(client, data, size); |
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if (ret == size) |
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return 0; |
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if (ret >= 0) |
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ret = -EIO; |
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dev_err(&client->dev, "%s failed (%*ph): %d\n", |
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__func__, (int)size, data, ret); |
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return ret; |
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} |
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static int elants_i2c_read(struct i2c_client *client, void *data, size_t size) |
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{ |
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int ret; |
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ret = i2c_master_recv(client, data, size); |
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if (ret == size) |
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return 0; |
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if (ret >= 0) |
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ret = -EIO; |
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dev_err(&client->dev, "%s failed: %d\n", __func__, ret); |
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return ret; |
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} |
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static int elants_i2c_execute_command(struct i2c_client *client, |
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const u8 *cmd, size_t cmd_size, |
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u8 *resp, size_t resp_size, |
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int retries, const char *cmd_name) |
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{ |
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struct i2c_msg msgs[2]; |
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int ret; |
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u8 expected_response; |
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switch (cmd[0]) { |
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case CMD_HEADER_READ: |
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expected_response = CMD_HEADER_RESP; |
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break; |
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case CMD_HEADER_6B_READ: |
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expected_response = CMD_HEADER_6B_RESP; |
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break; |
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case CMD_HEADER_ROM_READ: |
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expected_response = CMD_HEADER_ROM_RESP; |
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break; |
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default: |
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dev_err(&client->dev, "(%s): invalid command: %*ph\n", |
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cmd_name, (int)cmd_size, cmd); |
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return -EINVAL; |
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} |
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for (;;) { |
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msgs[0].addr = client->addr; |
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msgs[0].flags = client->flags & I2C_M_TEN; |
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msgs[0].len = cmd_size; |
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msgs[0].buf = (u8 *)cmd; |
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msgs[1].addr = client->addr; |
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msgs[1].flags = (client->flags & I2C_M_TEN) | I2C_M_RD; |
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msgs[1].flags |= I2C_M_RD; |
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msgs[1].len = resp_size; |
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msgs[1].buf = resp; |
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ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
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if (ret < 0) { |
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if (--retries > 0) { |
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dev_dbg(&client->dev, |
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"(%s) I2C transfer failed: %pe (retrying)\n", |
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cmd_name, ERR_PTR(ret)); |
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continue; |
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} |
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dev_err(&client->dev, |
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"(%s) I2C transfer failed: %pe\n", |
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cmd_name, ERR_PTR(ret)); |
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return ret; |
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} |
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if (ret != ARRAY_SIZE(msgs) || |
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resp[FW_HDR_TYPE] != expected_response) { |
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if (--retries > 0) { |
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dev_dbg(&client->dev, |
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"(%s) unexpected response: %*ph (retrying)\n", |
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cmd_name, ret, resp); |
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continue; |
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} |
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dev_err(&client->dev, |
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"(%s) unexpected response: %*ph\n", |
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cmd_name, ret, resp); |
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return -EIO; |
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} |
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return 0; |
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} |
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} |
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static int elants_i2c_calibrate(struct elants_data *ts) |
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{ |
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struct i2c_client *client = ts->client; |
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int ret, error; |
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static const u8 w_flashkey[] = { CMD_HEADER_WRITE, 0xC0, 0xE1, 0x5A }; |
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static const u8 rek[] = { CMD_HEADER_WRITE, 0x29, 0x00, 0x01 }; |
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static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 }; |
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disable_irq(client->irq); |
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ts->state = ELAN_WAIT_RECALIBRATION; |
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reinit_completion(&ts->cmd_done); |
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elants_i2c_send(client, w_flashkey, sizeof(w_flashkey)); |
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elants_i2c_send(client, rek, sizeof(rek)); |
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enable_irq(client->irq); |
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ret = wait_for_completion_interruptible_timeout(&ts->cmd_done, |
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msecs_to_jiffies(ELAN_CALI_TIMEOUT_MSEC)); |
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ts->state = ELAN_STATE_NORMAL; |
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if (ret <= 0) { |
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error = ret < 0 ? ret : -ETIMEDOUT; |
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dev_err(&client->dev, |
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"error while waiting for calibration to complete: %d\n", |
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error); |
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return error; |
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} |
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if (memcmp(rek_resp, ts->cmd_resp, sizeof(rek_resp))) { |
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dev_err(&client->dev, |
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"unexpected calibration response: %*ph\n", |
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(int)sizeof(ts->cmd_resp), ts->cmd_resp); |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int elants_i2c_sw_reset(struct i2c_client *client) |
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{ |
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const u8 soft_rst_cmd[] = { 0x77, 0x77, 0x77, 0x77 }; |
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int error; |
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error = elants_i2c_send(client, soft_rst_cmd, |
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sizeof(soft_rst_cmd)); |
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if (error) { |
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dev_err(&client->dev, "software reset failed: %d\n", error); |
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return error; |
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} |
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/* |
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* We should wait at least 10 msec (but no more than 40) before |
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* sending fastboot or IAP command to the device. |
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*/ |
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msleep(30); |
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return 0; |
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} |
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static u16 elants_i2c_parse_version(u8 *buf) |
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{ |
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return get_unaligned_be32(buf) >> 4; |
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} |
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static int elants_i2c_query_hw_version(struct elants_data *ts) |
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{ |
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struct i2c_client *client = ts->client; |
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int retry_cnt = MAX_RETRIES; |
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const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 }; |
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u8 resp[HEADER_SIZE]; |
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int error; |
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while (retry_cnt--) { |
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error = elants_i2c_execute_command(client, cmd, sizeof(cmd), |
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resp, sizeof(resp), 1, |
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"read fw id"); |
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if (error) |
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return error; |
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ts->hw_version = elants_i2c_parse_version(resp); |
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if (ts->hw_version != 0xffff) |
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return 0; |
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} |
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dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version); |
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return -EINVAL; |
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} |
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static int elants_i2c_query_fw_version(struct elants_data *ts) |
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{ |
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struct i2c_client *client = ts->client; |
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int retry_cnt = MAX_RETRIES; |
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const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 }; |
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u8 resp[HEADER_SIZE]; |
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int error; |
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while (retry_cnt--) { |
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error = elants_i2c_execute_command(client, cmd, sizeof(cmd), |
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resp, sizeof(resp), 1, |
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"read fw version"); |
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if (error) |
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return error; |
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ts->fw_version = elants_i2c_parse_version(resp); |
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if (ts->fw_version != 0x0000 && ts->fw_version != 0xffff) |
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return 0; |
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dev_dbg(&client->dev, "(read fw version) resp %*phC\n", |
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(int)sizeof(resp), resp); |
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} |
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dev_err(&client->dev, "Invalid fw ver: %#04x\n", ts->fw_version); |
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return -EINVAL; |
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} |
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static int elants_i2c_query_test_version(struct elants_data *ts) |
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{ |
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struct i2c_client *client = ts->client; |
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int error; |
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u16 version; |
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const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 }; |
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u8 resp[HEADER_SIZE]; |
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error = elants_i2c_execute_command(client, cmd, sizeof(cmd), |
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resp, sizeof(resp), MAX_RETRIES, |
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"read test version"); |
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if (error) { |
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dev_err(&client->dev, "Failed to read test version\n"); |
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return error; |
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} |
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version = elants_i2c_parse_version(resp); |
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ts->test_version = version >> 8; |
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ts->solution_version = version & 0xff; |
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return 0; |
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} |
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static int elants_i2c_query_bc_version(struct elants_data *ts) |
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{ |
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struct i2c_client *client = ts->client; |
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const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_BC_VER, 0x00, 0x01 }; |
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u8 resp[HEADER_SIZE]; |
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u16 version; |
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int error; |
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error = elants_i2c_execute_command(client, cmd, sizeof(cmd), |
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resp, sizeof(resp), 1, |
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"read BC version"); |
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if (error) |
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return error; |
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version = elants_i2c_parse_version(resp); |
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ts->bc_version = version >> 8; |
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ts->iap_version = version & 0xff; |
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return 0; |
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} |
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static int elants_i2c_query_ts_info_ektf(struct elants_data *ts) |
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{ |
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struct i2c_client *client = ts->client; |
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int error; |
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u8 resp[4]; |
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u16 phy_x, phy_y; |
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const u8 get_xres_cmd[] = { |
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CMD_HEADER_READ, E_ELAN_INFO_X_RES, 0x00, 0x00 |
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}; |
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const u8 get_yres_cmd[] = { |
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CMD_HEADER_READ, E_ELAN_INFO_Y_RES, 0x00, 0x00 |
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}; |
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/* Get X/Y size in mm */ |
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error = elants_i2c_execute_command(client, get_xres_cmd, |
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sizeof(get_xres_cmd), |
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resp, sizeof(resp), 1, |
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"get X size"); |
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if (error) |
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return error; |
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phy_x = resp[2] | ((resp[3] & 0xF0) << 4); |
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error = elants_i2c_execute_command(client, get_yres_cmd, |
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sizeof(get_yres_cmd), |
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resp, sizeof(resp), 1, |
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"get Y size"); |
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if (error) |
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return error; |
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phy_y = resp[2] | ((resp[3] & 0xF0) << 4); |
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dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); |
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|
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ts->phy_x = phy_x; |
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ts->phy_y = phy_y; |
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|
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/* eKTF doesn't report max size, set it to default values */ |
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ts->x_max = 2240 - 1; |
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ts->y_max = 1408 - 1; |
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|
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return 0; |
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} |
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|
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static int elants_i2c_query_ts_info_ekth(struct elants_data *ts) |
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{ |
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struct i2c_client *client = ts->client; |
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int error; |
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u8 resp[17]; |
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u16 phy_x, phy_y, rows, cols, osr; |
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const u8 get_resolution_cmd[] = { |
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CMD_HEADER_6B_READ, 0x00, 0x00, 0x00, 0x00, 0x00 |
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}; |
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const u8 get_osr_cmd[] = { |
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CMD_HEADER_READ, E_INFO_OSR, 0x00, 0x01 |
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}; |
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const u8 get_physical_scan_cmd[] = { |
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CMD_HEADER_READ, E_INFO_PHY_SCAN, 0x00, 0x01 |
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}; |
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const u8 get_physical_drive_cmd[] = { |
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CMD_HEADER_READ, E_INFO_PHY_DRIVER, 0x00, 0x01 |
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}; |
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|
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/* Get trace number */ |
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error = elants_i2c_execute_command(client, |
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get_resolution_cmd, |
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sizeof(get_resolution_cmd), |
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resp, sizeof(resp), 1, |
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"get resolution"); |
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if (error) |
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return error; |
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|
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rows = resp[2] + resp[6] + resp[10]; |
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cols = resp[3] + resp[7] + resp[11]; |
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|
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/* Get report resolution value of ABS_MT_TOUCH_MAJOR */ |
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ts->major_res = resp[16]; |
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|
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/* Process mm_to_pixel information */ |
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error = elants_i2c_execute_command(client, |
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get_osr_cmd, sizeof(get_osr_cmd), |
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resp, sizeof(resp), 1, "get osr"); |
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if (error) |
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return error; |
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|
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osr = resp[3]; |
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|
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error = elants_i2c_execute_command(client, |
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get_physical_scan_cmd, |
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sizeof(get_physical_scan_cmd), |
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resp, sizeof(resp), 1, |
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"get physical scan"); |
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if (error) |
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return error; |
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|
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phy_x = get_unaligned_be16(&resp[2]); |
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|
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error = elants_i2c_execute_command(client, |
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get_physical_drive_cmd, |
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sizeof(get_physical_drive_cmd), |
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resp, sizeof(resp), 1, |
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"get physical drive"); |
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if (error) |
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return error; |
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|
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phy_y = get_unaligned_be16(&resp[2]); |
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|
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dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y); |
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|
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if (rows == 0 || cols == 0 || osr == 0) { |
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dev_warn(&client->dev, |
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"invalid trace number data: %d, %d, %d\n", |
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rows, cols, osr); |
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} else { |
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/* translate trace number to TS resolution */ |
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ts->x_max = ELAN_TS_RESOLUTION(rows, osr); |
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ts->x_res = DIV_ROUND_CLOSEST(ts->x_max, phy_x); |
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ts->y_max = ELAN_TS_RESOLUTION(cols, osr); |
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ts->y_res = DIV_ROUND_CLOSEST(ts->y_max, phy_y); |
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ts->phy_x = phy_x; |
|
ts->phy_y = phy_y; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int elants_i2c_fastboot(struct i2c_client *client) |
|
{ |
|
const u8 boot_cmd[] = { 0x4D, 0x61, 0x69, 0x6E }; |
|
int error; |
|
|
|
error = elants_i2c_send(client, boot_cmd, sizeof(boot_cmd)); |
|
if (error) { |
|
dev_err(&client->dev, "boot failed: %d\n", error); |
|
return error; |
|
} |
|
|
|
dev_dbg(&client->dev, "boot success -- 0x%x\n", client->addr); |
|
return 0; |
|
} |
|
|
|
static int elants_i2c_initialize(struct elants_data *ts) |
|
{ |
|
struct i2c_client *client = ts->client; |
|
int error, error2, retry_cnt; |
|
const u8 hello_packet[] = { 0x55, 0x55, 0x55, 0x55 }; |
|
const u8 recov_packet[] = { 0x55, 0x55, 0x80, 0x80 }; |
|
u8 buf[HEADER_SIZE]; |
|
|
|
for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { |
|
error = elants_i2c_sw_reset(client); |
|
if (error) { |
|
/* Continue initializing if it's the last try */ |
|
if (retry_cnt < MAX_RETRIES - 1) |
|
continue; |
|
} |
|
|
|
error = elants_i2c_fastboot(client); |
|
if (error) { |
|
/* Continue initializing if it's the last try */ |
|
if (retry_cnt < MAX_RETRIES - 1) |
|
continue; |
|
} |
|
|
|
/* Wait for Hello packet */ |
|
msleep(BOOT_TIME_DELAY_MS); |
|
|
|
error = elants_i2c_read(client, buf, sizeof(buf)); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to read 'hello' packet: %d\n", error); |
|
} else if (!memcmp(buf, hello_packet, sizeof(hello_packet))) { |
|
ts->iap_mode = ELAN_IAP_OPERATIONAL; |
|
break; |
|
} else if (!memcmp(buf, recov_packet, sizeof(recov_packet))) { |
|
/* |
|
* Setting error code will mark device |
|
* in recovery mode below. |
|
*/ |
|
error = -EIO; |
|
break; |
|
} else { |
|
error = -EINVAL; |
|
dev_err(&client->dev, |
|
"invalid 'hello' packet: %*ph\n", |
|
(int)sizeof(buf), buf); |
|
} |
|
} |
|
|
|
/* hw version is available even if device in recovery state */ |
|
error2 = elants_i2c_query_hw_version(ts); |
|
if (!error2) |
|
error2 = elants_i2c_query_bc_version(ts); |
|
if (!error) |
|
error = error2; |
|
|
|
if (!error) |
|
error = elants_i2c_query_fw_version(ts); |
|
if (!error) |
|
error = elants_i2c_query_test_version(ts); |
|
|
|
switch (ts->chip_id) { |
|
case EKTH3500: |
|
if (!error) |
|
error = elants_i2c_query_ts_info_ekth(ts); |
|
break; |
|
case EKTF3624: |
|
if (!error) |
|
error = elants_i2c_query_ts_info_ektf(ts); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
|
|
if (error) |
|
ts->iap_mode = ELAN_IAP_RECOVERY; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Firmware update interface. |
|
*/ |
|
|
|
static int elants_i2c_fw_write_page(struct i2c_client *client, |
|
const void *page) |
|
{ |
|
const u8 ack_ok[] = { 0xaa, 0xaa }; |
|
u8 buf[2]; |
|
int retry; |
|
int error; |
|
|
|
for (retry = 0; retry < MAX_FW_UPDATE_RETRIES; retry++) { |
|
error = elants_i2c_send(client, page, ELAN_FW_PAGESIZE); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"IAP Write Page failed: %d\n", error); |
|
continue; |
|
} |
|
|
|
error = elants_i2c_read(client, buf, 2); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"IAP Ack read failed: %d\n", error); |
|
return error; |
|
} |
|
|
|
if (!memcmp(buf, ack_ok, sizeof(ack_ok))) |
|
return 0; |
|
|
|
error = -EIO; |
|
dev_err(&client->dev, |
|
"IAP Get Ack Error [%02x:%02x]\n", |
|
buf[0], buf[1]); |
|
} |
|
|
|
return error; |
|
} |
|
|
|
static int elants_i2c_validate_remark_id(struct elants_data *ts, |
|
const struct firmware *fw) |
|
{ |
|
struct i2c_client *client = ts->client; |
|
int error; |
|
const u8 cmd[] = { CMD_HEADER_ROM_READ, 0x80, 0x1F, 0x00, 0x00, 0x21 }; |
|
u8 resp[6] = { 0 }; |
|
u16 ts_remark_id = 0; |
|
u16 fw_remark_id = 0; |
|
|
|
/* Compare TS Remark ID and FW Remark ID */ |
|
error = elants_i2c_execute_command(client, cmd, sizeof(cmd), |
|
resp, sizeof(resp), |
|
1, "read Remark ID"); |
|
if (error) |
|
return error; |
|
|
|
ts_remark_id = get_unaligned_be16(&resp[3]); |
|
|
|
fw_remark_id = get_unaligned_le16(&fw->data[fw->size - 4]); |
|
|
|
if (fw_remark_id != ts_remark_id) { |
|
dev_err(&client->dev, |
|
"Remark ID Mismatched: ts_remark_id=0x%04x, fw_remark_id=0x%04x.\n", |
|
ts_remark_id, fw_remark_id); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int elants_i2c_do_update_firmware(struct i2c_client *client, |
|
const struct firmware *fw, |
|
bool force) |
|
{ |
|
struct elants_data *ts = i2c_get_clientdata(client); |
|
const u8 enter_iap[] = { 0x45, 0x49, 0x41, 0x50 }; |
|
const u8 enter_iap2[] = { 0x54, 0x00, 0x12, 0x34 }; |
|
const u8 iap_ack[] = { 0x55, 0xaa, 0x33, 0xcc }; |
|
const u8 close_idle[] = { 0x54, 0x2c, 0x01, 0x01 }; |
|
u8 buf[HEADER_SIZE]; |
|
u16 send_id; |
|
int page, n_fw_pages; |
|
int error; |
|
bool check_remark_id = ts->iap_version >= 0x60; |
|
|
|
/* Recovery mode detection! */ |
|
if (force) { |
|
dev_dbg(&client->dev, "Recovery mode procedure\n"); |
|
|
|
if (check_remark_id) { |
|
error = elants_i2c_validate_remark_id(ts, fw); |
|
if (error) |
|
return error; |
|
} |
|
|
|
error = elants_i2c_send(client, enter_iap2, sizeof(enter_iap2)); |
|
if (error) { |
|
dev_err(&client->dev, "failed to enter IAP mode: %d\n", |
|
error); |
|
return error; |
|
} |
|
} else { |
|
/* Start IAP Procedure */ |
|
dev_dbg(&client->dev, "Normal IAP procedure\n"); |
|
|
|
/* Close idle mode */ |
|
error = elants_i2c_send(client, close_idle, sizeof(close_idle)); |
|
if (error) |
|
dev_err(&client->dev, "Failed close idle: %d\n", error); |
|
msleep(60); |
|
|
|
elants_i2c_sw_reset(client); |
|
msleep(20); |
|
|
|
if (check_remark_id) { |
|
error = elants_i2c_validate_remark_id(ts, fw); |
|
if (error) |
|
return error; |
|
} |
|
|
|
error = elants_i2c_send(client, enter_iap, sizeof(enter_iap)); |
|
if (error) { |
|
dev_err(&client->dev, "failed to enter IAP mode: %d\n", |
|
error); |
|
return error; |
|
} |
|
} |
|
|
|
msleep(20); |
|
|
|
/* check IAP state */ |
|
error = elants_i2c_read(client, buf, 4); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to read IAP acknowledgement: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
if (memcmp(buf, iap_ack, sizeof(iap_ack))) { |
|
dev_err(&client->dev, |
|
"failed to enter IAP: %*ph (expected %*ph)\n", |
|
(int)sizeof(buf), buf, (int)sizeof(iap_ack), iap_ack); |
|
return -EIO; |
|
} |
|
|
|
dev_info(&client->dev, "successfully entered IAP mode"); |
|
|
|
send_id = client->addr; |
|
error = elants_i2c_send(client, &send_id, 1); |
|
if (error) { |
|
dev_err(&client->dev, "sending dummy byte failed: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
/* Clear the last page of Master */ |
|
error = elants_i2c_send(client, fw->data, ELAN_FW_PAGESIZE); |
|
if (error) { |
|
dev_err(&client->dev, "clearing of the last page failed: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
error = elants_i2c_read(client, buf, 2); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to read ACK for clearing the last page: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
n_fw_pages = fw->size / ELAN_FW_PAGESIZE; |
|
dev_dbg(&client->dev, "IAP Pages = %d\n", n_fw_pages); |
|
|
|
for (page = 0; page < n_fw_pages; page++) { |
|
error = elants_i2c_fw_write_page(client, |
|
fw->data + page * ELAN_FW_PAGESIZE); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to write FW page %d: %d\n", |
|
page, error); |
|
return error; |
|
} |
|
} |
|
|
|
/* Old iap needs to wait 200ms for WDT and rest is for hello packets */ |
|
msleep(300); |
|
|
|
dev_info(&client->dev, "firmware update completed\n"); |
|
return 0; |
|
} |
|
|
|
static int elants_i2c_fw_update(struct elants_data *ts) |
|
{ |
|
struct i2c_client *client = ts->client; |
|
const struct firmware *fw; |
|
char *fw_name; |
|
int error; |
|
|
|
fw_name = kasprintf(GFP_KERNEL, "elants_i2c_%04x.bin", ts->hw_version); |
|
if (!fw_name) |
|
return -ENOMEM; |
|
|
|
dev_info(&client->dev, "requesting fw name = %s\n", fw_name); |
|
error = request_firmware(&fw, fw_name, &client->dev); |
|
kfree(fw_name); |
|
if (error) { |
|
dev_err(&client->dev, "failed to request firmware: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
if (fw->size % ELAN_FW_PAGESIZE) { |
|
dev_err(&client->dev, "invalid firmware length: %zu\n", |
|
fw->size); |
|
error = -EINVAL; |
|
goto out; |
|
} |
|
|
|
disable_irq(client->irq); |
|
|
|
error = elants_i2c_do_update_firmware(client, fw, |
|
ts->iap_mode == ELAN_IAP_RECOVERY); |
|
if (error) { |
|
dev_err(&client->dev, "firmware update failed: %d\n", error); |
|
ts->iap_mode = ELAN_IAP_RECOVERY; |
|
goto out_enable_irq; |
|
} |
|
|
|
error = elants_i2c_initialize(ts); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to initialize device after firmware update: %d\n", |
|
error); |
|
ts->iap_mode = ELAN_IAP_RECOVERY; |
|
goto out_enable_irq; |
|
} |
|
|
|
ts->iap_mode = ELAN_IAP_OPERATIONAL; |
|
|
|
out_enable_irq: |
|
ts->state = ELAN_STATE_NORMAL; |
|
enable_irq(client->irq); |
|
msleep(100); |
|
|
|
if (!error) |
|
elants_i2c_calibrate(ts); |
|
out: |
|
release_firmware(fw); |
|
return error; |
|
} |
|
|
|
/* |
|
* Event reporting. |
|
*/ |
|
|
|
static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf, |
|
size_t packet_size) |
|
{ |
|
struct input_dev *input = ts->input; |
|
unsigned int n_fingers; |
|
unsigned int tool_type; |
|
u16 finger_state; |
|
int i; |
|
|
|
n_fingers = buf[FW_POS_STATE + 1] & 0x0f; |
|
finger_state = ((buf[FW_POS_STATE + 1] & 0x30) << 4) | |
|
buf[FW_POS_STATE]; |
|
|
|
dev_dbg(&ts->client->dev, |
|
"n_fingers: %u, state: %04x\n", n_fingers, finger_state); |
|
|
|
/* Note: all fingers have the same tool type */ |
|
tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ? |
|
MT_TOOL_FINGER : MT_TOOL_PALM; |
|
|
|
for (i = 0; i < MAX_CONTACT_NUM && n_fingers; i++) { |
|
if (finger_state & 1) { |
|
unsigned int x, y, p, w; |
|
u8 *pos; |
|
|
|
pos = &buf[FW_POS_XY + i * 3]; |
|
x = (((u16)pos[0] & 0xf0) << 4) | pos[1]; |
|
y = (((u16)pos[0] & 0x0f) << 8) | pos[2]; |
|
|
|
/* |
|
* eKTF3624 may have use "old" touch-report format, |
|
* depending on a device and TS firmware version. |
|
* For example, ASUS Transformer devices use the "old" |
|
* format, while ASUS Nexus 7 uses the "new" formant. |
|
*/ |
|
if (packet_size == PACKET_SIZE_OLD && |
|
ts->chip_id == EKTF3624) { |
|
w = buf[FW_POS_WIDTH + i / 2]; |
|
w >>= 4 * (~i & 1); |
|
w |= w << 4; |
|
w |= !w; |
|
p = w; |
|
} else { |
|
p = buf[FW_POS_PRESSURE + i]; |
|
w = buf[FW_POS_WIDTH + i]; |
|
} |
|
|
|
dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n", |
|
i, x, y, p, w); |
|
|
|
input_mt_slot(input, i); |
|
input_mt_report_slot_state(input, tool_type, true); |
|
touchscreen_report_pos(input, &ts->prop, x, y, true); |
|
input_event(input, EV_ABS, ABS_MT_PRESSURE, p); |
|
input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w); |
|
|
|
n_fingers--; |
|
} |
|
|
|
finger_state >>= 1; |
|
} |
|
|
|
input_mt_sync_frame(input); |
|
input_sync(input); |
|
} |
|
|
|
static u8 elants_i2c_calculate_checksum(u8 *buf) |
|
{ |
|
u8 checksum = 0; |
|
u8 i; |
|
|
|
for (i = 0; i < FW_POS_CHECKSUM; i++) |
|
checksum += buf[i]; |
|
|
|
return checksum; |
|
} |
|
|
|
static void elants_i2c_event(struct elants_data *ts, u8 *buf, |
|
size_t packet_size) |
|
{ |
|
u8 checksum = elants_i2c_calculate_checksum(buf); |
|
|
|
if (unlikely(buf[FW_POS_CHECKSUM] != checksum)) |
|
dev_warn(&ts->client->dev, |
|
"%s: invalid checksum for packet %02x: %02x vs. %02x\n", |
|
__func__, buf[FW_POS_HEADER], |
|
checksum, buf[FW_POS_CHECKSUM]); |
|
else if (unlikely(buf[FW_POS_HEADER] != HEADER_REPORT_10_FINGER)) |
|
dev_warn(&ts->client->dev, |
|
"%s: unknown packet type: %02x\n", |
|
__func__, buf[FW_POS_HEADER]); |
|
else |
|
elants_i2c_mt_event(ts, buf, packet_size); |
|
} |
|
|
|
static irqreturn_t elants_i2c_irq(int irq, void *_dev) |
|
{ |
|
const u8 wait_packet[] = { 0x64, 0x64, 0x64, 0x64 }; |
|
struct elants_data *ts = _dev; |
|
struct i2c_client *client = ts->client; |
|
int report_count, report_len; |
|
int i; |
|
int len; |
|
|
|
len = i2c_master_recv_dmasafe(client, ts->buf, sizeof(ts->buf)); |
|
if (len < 0) { |
|
dev_err(&client->dev, "%s: failed to read data: %d\n", |
|
__func__, len); |
|
goto out; |
|
} |
|
|
|
dev_dbg(&client->dev, "%s: packet %*ph\n", |
|
__func__, HEADER_SIZE, ts->buf); |
|
|
|
switch (ts->state) { |
|
case ELAN_WAIT_RECALIBRATION: |
|
if (ts->buf[FW_HDR_TYPE] == CMD_HEADER_REK) { |
|
memcpy(ts->cmd_resp, ts->buf, sizeof(ts->cmd_resp)); |
|
complete(&ts->cmd_done); |
|
ts->state = ELAN_STATE_NORMAL; |
|
} |
|
break; |
|
|
|
case ELAN_WAIT_QUEUE_HEADER: |
|
if (ts->buf[FW_HDR_TYPE] != QUEUE_HEADER_NORMAL) |
|
break; |
|
|
|
ts->state = ELAN_STATE_NORMAL; |
|
fallthrough; |
|
|
|
case ELAN_STATE_NORMAL: |
|
|
|
switch (ts->buf[FW_HDR_TYPE]) { |
|
case CMD_HEADER_HELLO: |
|
case CMD_HEADER_RESP: |
|
break; |
|
|
|
case QUEUE_HEADER_WAIT: |
|
if (memcmp(ts->buf, wait_packet, sizeof(wait_packet))) { |
|
dev_err(&client->dev, |
|
"invalid wait packet %*ph\n", |
|
HEADER_SIZE, ts->buf); |
|
} else { |
|
ts->state = ELAN_WAIT_QUEUE_HEADER; |
|
udelay(30); |
|
} |
|
break; |
|
|
|
case QUEUE_HEADER_SINGLE: |
|
elants_i2c_event(ts, &ts->buf[HEADER_SIZE], |
|
ts->buf[FW_HDR_LENGTH]); |
|
break; |
|
|
|
case QUEUE_HEADER_NORMAL2: /* CMD_HEADER_REK */ |
|
/* |
|
* Depending on firmware version, eKTF3624 touchscreens |
|
* may utilize one of these opcodes for the touch events: |
|
* 0x63 (NORMAL) and 0x66 (NORMAL2). The 0x63 is used by |
|
* older firmware version and differs from 0x66 such that |
|
* touch pressure value needs to be adjusted. The 0x66 |
|
* opcode of newer firmware is equal to 0x63 of eKTH3500. |
|
*/ |
|
if (ts->chip_id != EKTF3624) |
|
break; |
|
|
|
fallthrough; |
|
|
|
case QUEUE_HEADER_NORMAL: |
|
report_count = ts->buf[FW_HDR_COUNT]; |
|
if (report_count == 0 || report_count > 3) { |
|
dev_err(&client->dev, |
|
"bad report count: %*ph\n", |
|
HEADER_SIZE, ts->buf); |
|
break; |
|
} |
|
|
|
report_len = ts->buf[FW_HDR_LENGTH] / report_count; |
|
|
|
if (report_len == PACKET_SIZE_OLD && |
|
ts->chip_id == EKTF3624) { |
|
dev_dbg_once(&client->dev, |
|
"using old report format\n"); |
|
} else if (report_len != PACKET_SIZE) { |
|
dev_err(&client->dev, |
|
"mismatching report length: %*ph\n", |
|
HEADER_SIZE, ts->buf); |
|
break; |
|
} |
|
|
|
for (i = 0; i < report_count; i++) { |
|
u8 *buf = ts->buf + HEADER_SIZE + |
|
i * report_len; |
|
elants_i2c_event(ts, buf, report_len); |
|
} |
|
break; |
|
|
|
default: |
|
dev_err(&client->dev, "unknown packet %*ph\n", |
|
HEADER_SIZE, ts->buf); |
|
break; |
|
} |
|
break; |
|
} |
|
|
|
out: |
|
return IRQ_HANDLED; |
|
} |
|
|
|
/* |
|
* sysfs interface |
|
*/ |
|
static ssize_t calibrate_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct elants_data *ts = i2c_get_clientdata(client); |
|
int error; |
|
|
|
error = mutex_lock_interruptible(&ts->sysfs_mutex); |
|
if (error) |
|
return error; |
|
|
|
error = elants_i2c_calibrate(ts); |
|
|
|
mutex_unlock(&ts->sysfs_mutex); |
|
return error ?: count; |
|
} |
|
|
|
static ssize_t write_update_fw(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct elants_data *ts = i2c_get_clientdata(client); |
|
int error; |
|
|
|
error = mutex_lock_interruptible(&ts->sysfs_mutex); |
|
if (error) |
|
return error; |
|
|
|
error = elants_i2c_fw_update(ts); |
|
dev_dbg(dev, "firmware update result: %d\n", error); |
|
|
|
mutex_unlock(&ts->sysfs_mutex); |
|
return error ?: count; |
|
} |
|
|
|
static ssize_t show_iap_mode(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct elants_data *ts = i2c_get_clientdata(client); |
|
|
|
return sprintf(buf, "%s\n", |
|
ts->iap_mode == ELAN_IAP_OPERATIONAL ? |
|
"Normal" : "Recovery"); |
|
} |
|
|
|
static ssize_t show_calibration_count(struct device *dev, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_REK, 0x00, 0x01 }; |
|
u8 resp[HEADER_SIZE]; |
|
u16 rek_count; |
|
int error; |
|
|
|
error = elants_i2c_execute_command(client, cmd, sizeof(cmd), |
|
resp, sizeof(resp), 1, |
|
"read ReK status"); |
|
if (error) |
|
return sprintf(buf, "%d\n", error); |
|
|
|
rek_count = get_unaligned_be16(&resp[2]); |
|
return sprintf(buf, "0x%04x\n", rek_count); |
|
} |
|
|
|
static DEVICE_ATTR_WO(calibrate); |
|
static DEVICE_ATTR(iap_mode, S_IRUGO, show_iap_mode, NULL); |
|
static DEVICE_ATTR(calibration_count, S_IRUGO, show_calibration_count, NULL); |
|
static DEVICE_ATTR(update_fw, S_IWUSR, NULL, write_update_fw); |
|
|
|
struct elants_version_attribute { |
|
struct device_attribute dattr; |
|
size_t field_offset; |
|
size_t field_size; |
|
}; |
|
|
|
#define __ELANTS_FIELD_SIZE(_field) \ |
|
sizeof(((struct elants_data *)NULL)->_field) |
|
#define __ELANTS_VERIFY_SIZE(_field) \ |
|
(BUILD_BUG_ON_ZERO(__ELANTS_FIELD_SIZE(_field) > 2) + \ |
|
__ELANTS_FIELD_SIZE(_field)) |
|
#define ELANTS_VERSION_ATTR(_field) \ |
|
struct elants_version_attribute elants_ver_attr_##_field = { \ |
|
.dattr = __ATTR(_field, S_IRUGO, \ |
|
elants_version_attribute_show, NULL), \ |
|
.field_offset = offsetof(struct elants_data, _field), \ |
|
.field_size = __ELANTS_VERIFY_SIZE(_field), \ |
|
} |
|
|
|
static ssize_t elants_version_attribute_show(struct device *dev, |
|
struct device_attribute *dattr, |
|
char *buf) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct elants_data *ts = i2c_get_clientdata(client); |
|
struct elants_version_attribute *attr = |
|
container_of(dattr, struct elants_version_attribute, dattr); |
|
u8 *field = (u8 *)((char *)ts + attr->field_offset); |
|
unsigned int fmt_size; |
|
unsigned int val; |
|
|
|
if (attr->field_size == 1) { |
|
val = *field; |
|
fmt_size = 2; /* 2 HEX digits */ |
|
} else { |
|
val = *(u16 *)field; |
|
fmt_size = 4; /* 4 HEX digits */ |
|
} |
|
|
|
return sprintf(buf, "%0*x\n", fmt_size, val); |
|
} |
|
|
|
static ELANTS_VERSION_ATTR(fw_version); |
|
static ELANTS_VERSION_ATTR(hw_version); |
|
static ELANTS_VERSION_ATTR(test_version); |
|
static ELANTS_VERSION_ATTR(solution_version); |
|
static ELANTS_VERSION_ATTR(bc_version); |
|
static ELANTS_VERSION_ATTR(iap_version); |
|
|
|
static struct attribute *elants_attributes[] = { |
|
&dev_attr_calibrate.attr, |
|
&dev_attr_update_fw.attr, |
|
&dev_attr_iap_mode.attr, |
|
&dev_attr_calibration_count.attr, |
|
|
|
&elants_ver_attr_fw_version.dattr.attr, |
|
&elants_ver_attr_hw_version.dattr.attr, |
|
&elants_ver_attr_test_version.dattr.attr, |
|
&elants_ver_attr_solution_version.dattr.attr, |
|
&elants_ver_attr_bc_version.dattr.attr, |
|
&elants_ver_attr_iap_version.dattr.attr, |
|
NULL |
|
}; |
|
|
|
static const struct attribute_group elants_attribute_group = { |
|
.attrs = elants_attributes, |
|
}; |
|
|
|
static int elants_i2c_power_on(struct elants_data *ts) |
|
{ |
|
int error; |
|
|
|
/* |
|
* If we do not have reset gpio assume platform firmware |
|
* controls regulators and does power them on for us. |
|
*/ |
|
if (IS_ERR_OR_NULL(ts->reset_gpio)) |
|
return 0; |
|
|
|
gpiod_set_value_cansleep(ts->reset_gpio, 1); |
|
|
|
error = regulator_enable(ts->vcc33); |
|
if (error) { |
|
dev_err(&ts->client->dev, |
|
"failed to enable vcc33 regulator: %d\n", |
|
error); |
|
goto release_reset_gpio; |
|
} |
|
|
|
error = regulator_enable(ts->vccio); |
|
if (error) { |
|
dev_err(&ts->client->dev, |
|
"failed to enable vccio regulator: %d\n", |
|
error); |
|
regulator_disable(ts->vcc33); |
|
goto release_reset_gpio; |
|
} |
|
|
|
/* |
|
* We need to wait a bit after powering on controller before |
|
* we are allowed to release reset GPIO. |
|
*/ |
|
udelay(ELAN_POWERON_DELAY_USEC); |
|
|
|
release_reset_gpio: |
|
gpiod_set_value_cansleep(ts->reset_gpio, 0); |
|
if (error) |
|
return error; |
|
|
|
msleep(ELAN_RESET_DELAY_MSEC); |
|
|
|
return 0; |
|
} |
|
|
|
static void elants_i2c_power_off(void *_data) |
|
{ |
|
struct elants_data *ts = _data; |
|
|
|
if (!IS_ERR_OR_NULL(ts->reset_gpio)) { |
|
/* |
|
* Activate reset gpio to prevent leakage through the |
|
* pin once we shut off power to the controller. |
|
*/ |
|
gpiod_set_value_cansleep(ts->reset_gpio, 1); |
|
regulator_disable(ts->vccio); |
|
regulator_disable(ts->vcc33); |
|
} |
|
} |
|
|
|
#ifdef CONFIG_ACPI |
|
static const struct acpi_device_id i2c_hid_ids[] = { |
|
{"ACPI0C50", 0 }, |
|
{"PNP0C50", 0 }, |
|
{ }, |
|
}; |
|
|
|
static const guid_t i2c_hid_guid = |
|
GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555, |
|
0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE); |
|
|
|
static bool elants_acpi_is_hid_device(struct device *dev) |
|
{ |
|
acpi_handle handle = ACPI_HANDLE(dev); |
|
union acpi_object *obj; |
|
|
|
if (acpi_match_device_ids(ACPI_COMPANION(dev), i2c_hid_ids)) |
|
return false; |
|
|
|
obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL, ACPI_TYPE_INTEGER); |
|
if (obj) { |
|
ACPI_FREE(obj); |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
#else |
|
static bool elants_acpi_is_hid_device(struct device *dev) |
|
{ |
|
return false; |
|
} |
|
#endif |
|
|
|
static int elants_i2c_probe(struct i2c_client *client) |
|
{ |
|
union i2c_smbus_data dummy; |
|
struct elants_data *ts; |
|
unsigned long irqflags; |
|
int error; |
|
|
|
/* Don't bind to i2c-hid compatible devices, these are handled by the i2c-hid drv. */ |
|
if (elants_acpi_is_hid_device(&client->dev)) { |
|
dev_warn(&client->dev, "This device appears to be an I2C-HID device, not binding\n"); |
|
return -ENODEV; |
|
} |
|
|
|
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
|
dev_err(&client->dev, "I2C check functionality error\n"); |
|
return -ENXIO; |
|
} |
|
|
|
ts = devm_kzalloc(&client->dev, sizeof(struct elants_data), GFP_KERNEL); |
|
if (!ts) |
|
return -ENOMEM; |
|
|
|
mutex_init(&ts->sysfs_mutex); |
|
init_completion(&ts->cmd_done); |
|
|
|
ts->client = client; |
|
ts->chip_id = (enum elants_chip_id)(uintptr_t)device_get_match_data(&client->dev); |
|
i2c_set_clientdata(client, ts); |
|
|
|
ts->vcc33 = devm_regulator_get(&client->dev, "vcc33"); |
|
if (IS_ERR(ts->vcc33)) { |
|
error = PTR_ERR(ts->vcc33); |
|
if (error != -EPROBE_DEFER) |
|
dev_err(&client->dev, |
|
"Failed to get 'vcc33' regulator: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
ts->vccio = devm_regulator_get(&client->dev, "vccio"); |
|
if (IS_ERR(ts->vccio)) { |
|
error = PTR_ERR(ts->vccio); |
|
if (error != -EPROBE_DEFER) |
|
dev_err(&client->dev, |
|
"Failed to get 'vccio' regulator: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
ts->reset_gpio = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_LOW); |
|
if (IS_ERR(ts->reset_gpio)) { |
|
error = PTR_ERR(ts->reset_gpio); |
|
|
|
if (error == -EPROBE_DEFER) |
|
return error; |
|
|
|
if (error != -ENOENT && error != -ENOSYS) { |
|
dev_err(&client->dev, |
|
"failed to get reset gpio: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
ts->keep_power_in_suspend = true; |
|
} |
|
|
|
error = elants_i2c_power_on(ts); |
|
if (error) |
|
return error; |
|
|
|
error = devm_add_action(&client->dev, elants_i2c_power_off, ts); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to install power off action: %d\n", error); |
|
elants_i2c_power_off(ts); |
|
return error; |
|
} |
|
|
|
/* Make sure there is something at this address */ |
|
if (i2c_smbus_xfer(client->adapter, client->addr, 0, |
|
I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { |
|
dev_err(&client->dev, "nothing at this address\n"); |
|
return -ENXIO; |
|
} |
|
|
|
error = elants_i2c_initialize(ts); |
|
if (error) { |
|
dev_err(&client->dev, "failed to initialize: %d\n", error); |
|
return error; |
|
} |
|
|
|
ts->input = devm_input_allocate_device(&client->dev); |
|
if (!ts->input) { |
|
dev_err(&client->dev, "Failed to allocate input device\n"); |
|
return -ENOMEM; |
|
} |
|
|
|
ts->input->name = "Elan Touchscreen"; |
|
ts->input->id.bustype = BUS_I2C; |
|
|
|
/* Multitouch input params setup */ |
|
|
|
input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0); |
|
input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0); |
|
input_set_abs_params(ts->input, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); |
|
input_set_abs_params(ts->input, ABS_MT_PRESSURE, 0, 255, 0, 0); |
|
input_set_abs_params(ts->input, ABS_MT_TOOL_TYPE, |
|
0, MT_TOOL_PALM, 0, 0); |
|
|
|
touchscreen_parse_properties(ts->input, true, &ts->prop); |
|
|
|
if (ts->chip_id == EKTF3624 && ts->phy_x && ts->phy_y) { |
|
/* calculate resolution from size */ |
|
ts->x_res = DIV_ROUND_CLOSEST(ts->prop.max_x, ts->phy_x); |
|
ts->y_res = DIV_ROUND_CLOSEST(ts->prop.max_y, ts->phy_y); |
|
} |
|
|
|
input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->x_res); |
|
input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res); |
|
input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, ts->major_res); |
|
|
|
error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM, |
|
INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to initialize MT slots: %d\n", error); |
|
return error; |
|
} |
|
|
|
error = input_register_device(ts->input); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"unable to register input device: %d\n", error); |
|
return error; |
|
} |
|
|
|
/* |
|
* Platform code (ACPI, DTS) should normally set up interrupt |
|
* for us, but in case it did not let's fall back to using falling |
|
* edge to be compatible with older Chromebooks. |
|
*/ |
|
irqflags = irq_get_trigger_type(client->irq); |
|
if (!irqflags) |
|
irqflags = IRQF_TRIGGER_FALLING; |
|
|
|
error = devm_request_threaded_irq(&client->dev, client->irq, |
|
NULL, elants_i2c_irq, |
|
irqflags | IRQF_ONESHOT, |
|
client->name, ts); |
|
if (error) { |
|
dev_err(&client->dev, "Failed to register interrupt\n"); |
|
return error; |
|
} |
|
|
|
/* |
|
* Systems using device tree should set up wakeup via DTS, |
|
* the rest will configure device as wakeup source by default. |
|
*/ |
|
if (!client->dev.of_node) |
|
device_init_wakeup(&client->dev, true); |
|
|
|
error = devm_device_add_group(&client->dev, &elants_attribute_group); |
|
if (error) { |
|
dev_err(&client->dev, "failed to create sysfs attributes: %d\n", |
|
error); |
|
return error; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused elants_i2c_suspend(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct elants_data *ts = i2c_get_clientdata(client); |
|
const u8 set_sleep_cmd[] = { |
|
CMD_HEADER_WRITE, E_POWER_STATE_SLEEP, 0x00, 0x01 |
|
}; |
|
int retry_cnt; |
|
int error; |
|
|
|
/* Command not support in IAP recovery mode */ |
|
if (ts->iap_mode != ELAN_IAP_OPERATIONAL) |
|
return -EBUSY; |
|
|
|
disable_irq(client->irq); |
|
|
|
if (device_may_wakeup(dev)) { |
|
/* |
|
* The device will automatically enter idle mode |
|
* that has reduced power consumption. |
|
*/ |
|
ts->wake_irq_enabled = (enable_irq_wake(client->irq) == 0); |
|
} else if (ts->keep_power_in_suspend) { |
|
for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { |
|
error = elants_i2c_send(client, set_sleep_cmd, |
|
sizeof(set_sleep_cmd)); |
|
if (!error) |
|
break; |
|
|
|
dev_err(&client->dev, |
|
"suspend command failed: %d\n", error); |
|
} |
|
} else { |
|
elants_i2c_power_off(ts); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused elants_i2c_resume(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct elants_data *ts = i2c_get_clientdata(client); |
|
const u8 set_active_cmd[] = { |
|
CMD_HEADER_WRITE, E_POWER_STATE_RESUME, 0x00, 0x01 |
|
}; |
|
int retry_cnt; |
|
int error; |
|
|
|
if (device_may_wakeup(dev)) { |
|
if (ts->wake_irq_enabled) |
|
disable_irq_wake(client->irq); |
|
elants_i2c_sw_reset(client); |
|
} else if (ts->keep_power_in_suspend) { |
|
for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) { |
|
error = elants_i2c_send(client, set_active_cmd, |
|
sizeof(set_active_cmd)); |
|
if (!error) |
|
break; |
|
|
|
dev_err(&client->dev, |
|
"resume command failed: %d\n", error); |
|
} |
|
} else { |
|
elants_i2c_power_on(ts); |
|
elants_i2c_initialize(ts); |
|
} |
|
|
|
ts->state = ELAN_STATE_NORMAL; |
|
enable_irq(client->irq); |
|
|
|
return 0; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(elants_i2c_pm_ops, |
|
elants_i2c_suspend, elants_i2c_resume); |
|
|
|
static const struct i2c_device_id elants_i2c_id[] = { |
|
{ DEVICE_NAME, EKTH3500 }, |
|
{ "ekth3500", EKTH3500 }, |
|
{ "ektf3624", EKTF3624 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, elants_i2c_id); |
|
|
|
#ifdef CONFIG_ACPI |
|
static const struct acpi_device_id elants_acpi_id[] = { |
|
{ "ELAN0001", EKTH3500 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(acpi, elants_acpi_id); |
|
#endif |
|
|
|
#ifdef CONFIG_OF |
|
static const struct of_device_id elants_of_match[] = { |
|
{ .compatible = "elan,ekth3500", .data = (void *)EKTH3500 }, |
|
{ .compatible = "elan,ektf3624", .data = (void *)EKTF3624 }, |
|
{ /* sentinel */ } |
|
}; |
|
MODULE_DEVICE_TABLE(of, elants_of_match); |
|
#endif |
|
|
|
static struct i2c_driver elants_i2c_driver = { |
|
.probe_new = elants_i2c_probe, |
|
.id_table = elants_i2c_id, |
|
.driver = { |
|
.name = DEVICE_NAME, |
|
.pm = &elants_i2c_pm_ops, |
|
.acpi_match_table = ACPI_PTR(elants_acpi_id), |
|
.of_match_table = of_match_ptr(elants_of_match), |
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS, |
|
}, |
|
}; |
|
module_i2c_driver(elants_i2c_driver); |
|
|
|
MODULE_AUTHOR("Scott Liu <[email protected]>"); |
|
MODULE_DESCRIPTION("Elan I2c Touchscreen driver"); |
|
MODULE_LICENSE("GPL");
|
|
|