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632 lines
16 KiB
632 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) ST-Ericsson SA 2010 |
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* Author: Naveen Kumar G <[email protected]> for ST-Ericsson |
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*/ |
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#include <linux/bitops.h> |
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#include <linux/delay.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/i2c.h> |
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#include <linux/input.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/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/property.h> |
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#include <linux/regulator/consumer.h> |
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#include <linux/slab.h> |
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#include <linux/types.h> |
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#define MAX_FINGERS 2 |
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#define RESET_DELAY 30 |
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#define PENUP_TIMEOUT (10) |
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#define DELTA_MIN 16 |
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#define MASK_BITS 0x03 |
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#define SHIFT_8 8 |
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#define SHIFT_2 2 |
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#define LENGTH_OF_BUFFER 11 |
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#define I2C_RETRY_COUNT 5 |
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#define BU21013_SENSORS_BTN_0_7_REG 0x70 |
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#define BU21013_SENSORS_BTN_8_15_REG 0x71 |
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#define BU21013_SENSORS_BTN_16_23_REG 0x72 |
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#define BU21013_X1_POS_MSB_REG 0x73 |
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#define BU21013_X1_POS_LSB_REG 0x74 |
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#define BU21013_Y1_POS_MSB_REG 0x75 |
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#define BU21013_Y1_POS_LSB_REG 0x76 |
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#define BU21013_X2_POS_MSB_REG 0x77 |
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#define BU21013_X2_POS_LSB_REG 0x78 |
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#define BU21013_Y2_POS_MSB_REG 0x79 |
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#define BU21013_Y2_POS_LSB_REG 0x7A |
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#define BU21013_INT_CLR_REG 0xE8 |
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#define BU21013_INT_MODE_REG 0xE9 |
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#define BU21013_GAIN_REG 0xEA |
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#define BU21013_OFFSET_MODE_REG 0xEB |
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#define BU21013_XY_EDGE_REG 0xEC |
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#define BU21013_RESET_REG 0xED |
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#define BU21013_CALIB_REG 0xEE |
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#define BU21013_DONE_REG 0xEF |
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#define BU21013_SENSOR_0_7_REG 0xF0 |
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#define BU21013_SENSOR_8_15_REG 0xF1 |
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#define BU21013_SENSOR_16_23_REG 0xF2 |
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#define BU21013_POS_MODE1_REG 0xF3 |
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#define BU21013_POS_MODE2_REG 0xF4 |
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#define BU21013_CLK_MODE_REG 0xF5 |
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#define BU21013_IDLE_REG 0xFA |
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#define BU21013_FILTER_REG 0xFB |
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#define BU21013_TH_ON_REG 0xFC |
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#define BU21013_TH_OFF_REG 0xFD |
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#define BU21013_RESET_ENABLE 0x01 |
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#define BU21013_SENSORS_EN_0_7 0x3F |
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#define BU21013_SENSORS_EN_8_15 0xFC |
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#define BU21013_SENSORS_EN_16_23 0x1F |
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#define BU21013_POS_MODE1_0 0x02 |
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#define BU21013_POS_MODE1_1 0x04 |
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#define BU21013_POS_MODE1_2 0x08 |
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#define BU21013_POS_MODE2_ZERO 0x01 |
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#define BU21013_POS_MODE2_AVG1 0x02 |
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#define BU21013_POS_MODE2_AVG2 0x04 |
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#define BU21013_POS_MODE2_EN_XY 0x08 |
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#define BU21013_POS_MODE2_EN_RAW 0x10 |
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#define BU21013_POS_MODE2_MULTI 0x80 |
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#define BU21013_CLK_MODE_DIV 0x01 |
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#define BU21013_CLK_MODE_EXT 0x02 |
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#define BU21013_CLK_MODE_CALIB 0x80 |
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#define BU21013_IDLET_0 0x01 |
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#define BU21013_IDLET_1 0x02 |
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#define BU21013_IDLET_2 0x04 |
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#define BU21013_IDLET_3 0x08 |
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#define BU21013_IDLE_INTERMIT_EN 0x10 |
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#define BU21013_DELTA_0_6 0x7F |
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#define BU21013_FILTER_EN 0x80 |
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#define BU21013_INT_MODE_LEVEL 0x00 |
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#define BU21013_INT_MODE_EDGE 0x01 |
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#define BU21013_GAIN_0 0x01 |
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#define BU21013_GAIN_1 0x02 |
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#define BU21013_GAIN_2 0x04 |
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#define BU21013_OFFSET_MODE_DEFAULT 0x00 |
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#define BU21013_OFFSET_MODE_MOVE 0x01 |
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#define BU21013_OFFSET_MODE_DISABLE 0x02 |
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#define BU21013_TH_ON_0 0x01 |
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#define BU21013_TH_ON_1 0x02 |
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#define BU21013_TH_ON_2 0x04 |
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#define BU21013_TH_ON_3 0x08 |
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#define BU21013_TH_ON_4 0x10 |
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#define BU21013_TH_ON_5 0x20 |
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#define BU21013_TH_ON_6 0x40 |
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#define BU21013_TH_ON_7 0x80 |
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#define BU21013_TH_ON_MAX 0xFF |
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#define BU21013_TH_OFF_0 0x01 |
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#define BU21013_TH_OFF_1 0x02 |
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#define BU21013_TH_OFF_2 0x04 |
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#define BU21013_TH_OFF_3 0x08 |
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#define BU21013_TH_OFF_4 0x10 |
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#define BU21013_TH_OFF_5 0x20 |
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#define BU21013_TH_OFF_6 0x40 |
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#define BU21013_TH_OFF_7 0x80 |
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#define BU21013_TH_OFF_MAX 0xFF |
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#define BU21013_X_EDGE_0 0x01 |
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#define BU21013_X_EDGE_1 0x02 |
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#define BU21013_X_EDGE_2 0x04 |
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#define BU21013_X_EDGE_3 0x08 |
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#define BU21013_Y_EDGE_0 0x10 |
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#define BU21013_Y_EDGE_1 0x20 |
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#define BU21013_Y_EDGE_2 0x40 |
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#define BU21013_Y_EDGE_3 0x80 |
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#define BU21013_DONE 0x01 |
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#define BU21013_NUMBER_OF_X_SENSORS (6) |
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#define BU21013_NUMBER_OF_Y_SENSORS (11) |
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#define DRIVER_TP "bu21013_tp" |
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/** |
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* struct bu21013_ts - touch panel data structure |
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* @client: pointer to the i2c client |
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* @in_dev: pointer to the input device structure |
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* @props: the device coordinate transformation properties |
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* @regulator: pointer to the Regulator used for touch screen |
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* @cs_gpiod: chip select GPIO line |
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* @int_gpiod: touch interrupt GPIO line |
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* @touch_x_max: maximum X coordinate reported by the device |
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* @touch_y_max: maximum Y coordinate reported by the device |
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* @x_flip: indicates that the driver should invert X coordinate before |
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* reporting |
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* @y_flip: indicates that the driver should invert Y coordinate before |
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* reporting |
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* @touch_stopped: touch stop flag |
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* |
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* Touch panel device data structure |
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*/ |
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struct bu21013_ts { |
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struct i2c_client *client; |
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struct input_dev *in_dev; |
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struct touchscreen_properties props; |
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struct regulator *regulator; |
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struct gpio_desc *cs_gpiod; |
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struct gpio_desc *int_gpiod; |
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u32 touch_x_max; |
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u32 touch_y_max; |
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bool x_flip; |
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bool y_flip; |
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bool touch_stopped; |
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}; |
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static int bu21013_read_block_data(struct bu21013_ts *ts, u8 *buf) |
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{ |
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int ret, i; |
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for (i = 0; i < I2C_RETRY_COUNT; i++) { |
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ret = i2c_smbus_read_i2c_block_data(ts->client, |
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BU21013_SENSORS_BTN_0_7_REG, |
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LENGTH_OF_BUFFER, buf); |
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if (ret == LENGTH_OF_BUFFER) |
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return 0; |
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} |
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return -EINVAL; |
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} |
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static int bu21013_do_touch_report(struct bu21013_ts *ts) |
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{ |
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struct input_dev *input = ts->in_dev; |
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struct input_mt_pos pos[MAX_FINGERS]; |
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int slots[MAX_FINGERS]; |
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u8 buf[LENGTH_OF_BUFFER]; |
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bool has_x_sensors, has_y_sensors; |
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int finger_down_count = 0; |
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int i; |
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if (bu21013_read_block_data(ts, buf) < 0) |
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return -EINVAL; |
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has_x_sensors = hweight32(buf[0] & BU21013_SENSORS_EN_0_7); |
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has_y_sensors = hweight32(((buf[1] & BU21013_SENSORS_EN_8_15) | |
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((buf[2] & BU21013_SENSORS_EN_16_23) << SHIFT_8)) >> SHIFT_2); |
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if (!has_x_sensors || !has_y_sensors) |
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return 0; |
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for (i = 0; i < MAX_FINGERS; i++) { |
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const u8 *data = &buf[4 * i + 3]; |
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unsigned int x, y; |
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x = data[0] << SHIFT_2 | (data[1] & MASK_BITS); |
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y = data[2] << SHIFT_2 | (data[3] & MASK_BITS); |
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if (x != 0 && y != 0) |
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touchscreen_set_mt_pos(&pos[finger_down_count++], |
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&ts->props, x, y); |
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} |
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if (finger_down_count == 2 && |
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(abs(pos[0].x - pos[1].x) < DELTA_MIN || |
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abs(pos[0].y - pos[1].y) < DELTA_MIN)) { |
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return 0; |
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} |
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input_mt_assign_slots(input, slots, pos, finger_down_count, DELTA_MIN); |
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for (i = 0; i < finger_down_count; i++) { |
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input_mt_slot(input, slots[i]); |
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input_mt_report_slot_state(input, MT_TOOL_FINGER, true); |
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input_report_abs(input, ABS_MT_POSITION_X, pos[i].x); |
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input_report_abs(input, ABS_MT_POSITION_Y, pos[i].y); |
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} |
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input_mt_sync_frame(input); |
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input_sync(input); |
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return 0; |
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} |
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static irqreturn_t bu21013_gpio_irq(int irq, void *device_data) |
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{ |
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struct bu21013_ts *ts = device_data; |
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int keep_polling; |
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int error; |
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do { |
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error = bu21013_do_touch_report(ts); |
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if (error) { |
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dev_err(&ts->client->dev, "%s failed\n", __func__); |
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break; |
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} |
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if (unlikely(ts->touch_stopped)) |
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break; |
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keep_polling = ts->int_gpiod ? |
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gpiod_get_value(ts->int_gpiod) : false; |
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if (keep_polling) |
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usleep_range(2000, 2500); |
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} while (keep_polling); |
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return IRQ_HANDLED; |
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} |
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static int bu21013_init_chip(struct bu21013_ts *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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error = i2c_smbus_write_byte_data(client, BU21013_RESET_REG, |
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BU21013_RESET_ENABLE); |
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if (error) { |
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dev_err(&client->dev, "BU21013_RESET reg write failed\n"); |
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return error; |
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} |
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msleep(RESET_DELAY); |
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error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_0_7_REG, |
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BU21013_SENSORS_EN_0_7); |
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if (error) { |
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dev_err(&client->dev, "BU21013_SENSOR_0_7 reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_8_15_REG, |
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BU21013_SENSORS_EN_8_15); |
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if (error) { |
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dev_err(&client->dev, "BU21013_SENSOR_8_15 reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_SENSOR_16_23_REG, |
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BU21013_SENSORS_EN_16_23); |
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if (error) { |
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dev_err(&client->dev, "BU21013_SENSOR_16_23 reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE1_REG, |
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BU21013_POS_MODE1_0 | |
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BU21013_POS_MODE1_1); |
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if (error) { |
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dev_err(&client->dev, "BU21013_POS_MODE1 reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_POS_MODE2_REG, |
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BU21013_POS_MODE2_ZERO | |
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BU21013_POS_MODE2_AVG1 | |
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BU21013_POS_MODE2_AVG2 | |
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BU21013_POS_MODE2_EN_RAW | |
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BU21013_POS_MODE2_MULTI); |
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if (error) { |
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dev_err(&client->dev, "BU21013_POS_MODE2 reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_CLK_MODE_REG, |
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BU21013_CLK_MODE_DIV | |
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BU21013_CLK_MODE_CALIB); |
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if (error) { |
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dev_err(&client->dev, "BU21013_CLK_MODE reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_IDLE_REG, |
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BU21013_IDLET_0 | |
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BU21013_IDLE_INTERMIT_EN); |
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if (error) { |
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dev_err(&client->dev, "BU21013_IDLE reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_INT_MODE_REG, |
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BU21013_INT_MODE_LEVEL); |
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if (error) { |
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dev_err(&client->dev, "BU21013_INT_MODE reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_FILTER_REG, |
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BU21013_DELTA_0_6 | |
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BU21013_FILTER_EN); |
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if (error) { |
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dev_err(&client->dev, "BU21013_FILTER reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_TH_ON_REG, |
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BU21013_TH_ON_5); |
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if (error) { |
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dev_err(&client->dev, "BU21013_TH_ON reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_TH_OFF_REG, |
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BU21013_TH_OFF_4 | BU21013_TH_OFF_3); |
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if (error) { |
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dev_err(&client->dev, "BU21013_TH_OFF reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_GAIN_REG, |
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BU21013_GAIN_0 | BU21013_GAIN_1); |
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if (error) { |
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dev_err(&client->dev, "BU21013_GAIN reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_OFFSET_MODE_REG, |
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BU21013_OFFSET_MODE_DEFAULT); |
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if (error) { |
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dev_err(&client->dev, "BU21013_OFFSET_MODE reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_XY_EDGE_REG, |
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BU21013_X_EDGE_0 | |
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BU21013_X_EDGE_2 | |
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BU21013_Y_EDGE_1 | |
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BU21013_Y_EDGE_3); |
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if (error) { |
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dev_err(&client->dev, "BU21013_XY_EDGE reg write failed\n"); |
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return error; |
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} |
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error = i2c_smbus_write_byte_data(client, BU21013_DONE_REG, |
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BU21013_DONE); |
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if (error) { |
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dev_err(&client->dev, "BU21013_REG_DONE reg write failed\n"); |
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return error; |
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} |
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return 0; |
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} |
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static void bu21013_power_off(void *_ts) |
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{ |
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struct bu21013_ts *ts = _ts; |
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regulator_disable(ts->regulator); |
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} |
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static void bu21013_disable_chip(void *_ts) |
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{ |
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struct bu21013_ts *ts = _ts; |
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gpiod_set_value(ts->cs_gpiod, 0); |
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} |
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static int bu21013_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct bu21013_ts *ts; |
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struct input_dev *in_dev; |
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struct input_absinfo *info; |
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u32 max_x = 0, max_y = 0; |
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int error; |
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if (!i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_BYTE_DATA)) { |
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dev_err(&client->dev, "i2c smbus byte data not supported\n"); |
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return -EIO; |
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} |
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if (!client->irq) { |
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dev_err(&client->dev, "No IRQ set up\n"); |
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return -EINVAL; |
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} |
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ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); |
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if (!ts) |
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return -ENOMEM; |
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ts->client = client; |
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ts->x_flip = device_property_read_bool(&client->dev, "rohm,flip-x"); |
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ts->y_flip = device_property_read_bool(&client->dev, "rohm,flip-y"); |
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in_dev = devm_input_allocate_device(&client->dev); |
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if (!in_dev) { |
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dev_err(&client->dev, "device memory alloc failed\n"); |
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return -ENOMEM; |
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} |
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ts->in_dev = in_dev; |
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input_set_drvdata(in_dev, ts); |
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/* register the device to input subsystem */ |
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in_dev->name = DRIVER_TP; |
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in_dev->id.bustype = BUS_I2C; |
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device_property_read_u32(&client->dev, "rohm,touch-max-x", &max_x); |
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device_property_read_u32(&client->dev, "rohm,touch-max-y", &max_y); |
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input_set_abs_params(in_dev, ABS_MT_POSITION_X, 0, max_x, 0, 0); |
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input_set_abs_params(in_dev, ABS_MT_POSITION_Y, 0, max_y, 0, 0); |
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touchscreen_parse_properties(in_dev, true, &ts->props); |
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/* Adjust for the legacy "flip" properties, if present */ |
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if (!ts->props.invert_x && |
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device_property_read_bool(&client->dev, "rohm,flip-x")) { |
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info = &in_dev->absinfo[ABS_MT_POSITION_X]; |
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info->maximum -= info->minimum; |
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info->minimum = 0; |
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} |
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if (!ts->props.invert_y && |
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device_property_read_bool(&client->dev, "rohm,flip-y")) { |
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info = &in_dev->absinfo[ABS_MT_POSITION_Y]; |
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info->maximum -= info->minimum; |
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info->minimum = 0; |
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} |
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error = input_mt_init_slots(in_dev, MAX_FINGERS, |
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INPUT_MT_DIRECT | INPUT_MT_TRACK | |
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INPUT_MT_DROP_UNUSED); |
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if (error) { |
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dev_err(&client->dev, "failed to initialize MT slots"); |
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return error; |
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} |
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ts->regulator = devm_regulator_get(&client->dev, "avdd"); |
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if (IS_ERR(ts->regulator)) { |
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dev_err(&client->dev, "regulator_get failed\n"); |
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return PTR_ERR(ts->regulator); |
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} |
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error = regulator_enable(ts->regulator); |
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if (error) { |
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dev_err(&client->dev, "regulator enable failed\n"); |
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return error; |
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} |
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error = devm_add_action_or_reset(&client->dev, bu21013_power_off, ts); |
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if (error) { |
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dev_err(&client->dev, "failed to install power off handler\n"); |
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return error; |
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} |
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/* Named "CS" on the chip, DT binding is "reset" */ |
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ts->cs_gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH); |
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error = PTR_ERR_OR_ZERO(ts->cs_gpiod); |
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if (error) { |
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if (error != -EPROBE_DEFER) |
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dev_err(&client->dev, "failed to get CS GPIO\n"); |
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return error; |
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} |
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gpiod_set_consumer_name(ts->cs_gpiod, "BU21013 CS"); |
|
|
|
error = devm_add_action_or_reset(&client->dev, |
|
bu21013_disable_chip, ts); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to install chip disable handler\n"); |
|
return error; |
|
} |
|
|
|
/* Named "INT" on the chip, DT binding is "touch" */ |
|
ts->int_gpiod = devm_gpiod_get_optional(&client->dev, |
|
"touch", GPIOD_IN); |
|
error = PTR_ERR_OR_ZERO(ts->int_gpiod); |
|
if (error) { |
|
if (error != -EPROBE_DEFER) |
|
dev_err(&client->dev, "failed to get INT GPIO\n"); |
|
return error; |
|
} |
|
|
|
if (ts->int_gpiod) |
|
gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT"); |
|
|
|
/* configure the touch panel controller */ |
|
error = bu21013_init_chip(ts); |
|
if (error) { |
|
dev_err(&client->dev, "error in bu21013 config\n"); |
|
return error; |
|
} |
|
|
|
error = devm_request_threaded_irq(&client->dev, client->irq, |
|
NULL, bu21013_gpio_irq, |
|
IRQF_ONESHOT, DRIVER_TP, ts); |
|
if (error) { |
|
dev_err(&client->dev, "request irq %d failed\n", |
|
client->irq); |
|
return error; |
|
} |
|
|
|
error = input_register_device(in_dev); |
|
if (error) { |
|
dev_err(&client->dev, "failed to register input device\n"); |
|
return error; |
|
} |
|
|
|
i2c_set_clientdata(client, ts); |
|
|
|
return 0; |
|
} |
|
|
|
static int bu21013_remove(struct i2c_client *client) |
|
{ |
|
struct bu21013_ts *ts = i2c_get_clientdata(client); |
|
|
|
/* Make sure IRQ will exit quickly even if there is contact */ |
|
ts->touch_stopped = true; |
|
/* The resources will be freed by devm */ |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused bu21013_suspend(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct bu21013_ts *ts = i2c_get_clientdata(client); |
|
|
|
ts->touch_stopped = true; |
|
mb(); |
|
disable_irq(client->irq); |
|
|
|
if (!device_may_wakeup(&client->dev)) |
|
regulator_disable(ts->regulator); |
|
|
|
return 0; |
|
} |
|
|
|
static int __maybe_unused bu21013_resume(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
struct bu21013_ts *ts = i2c_get_clientdata(client); |
|
int error; |
|
|
|
if (!device_may_wakeup(&client->dev)) { |
|
error = regulator_enable(ts->regulator); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to re-enable regulator when resuming\n"); |
|
return error; |
|
} |
|
|
|
error = bu21013_init_chip(ts); |
|
if (error) { |
|
dev_err(&client->dev, |
|
"failed to reinitialize chip when resuming\n"); |
|
return error; |
|
} |
|
} |
|
|
|
ts->touch_stopped = false; |
|
mb(); |
|
enable_irq(client->irq); |
|
|
|
return 0; |
|
} |
|
|
|
static SIMPLE_DEV_PM_OPS(bu21013_dev_pm_ops, bu21013_suspend, bu21013_resume); |
|
|
|
static const struct i2c_device_id bu21013_id[] = { |
|
{ DRIVER_TP, 0 }, |
|
{ } |
|
}; |
|
MODULE_DEVICE_TABLE(i2c, bu21013_id); |
|
|
|
static struct i2c_driver bu21013_driver = { |
|
.driver = { |
|
.name = DRIVER_TP, |
|
.pm = &bu21013_dev_pm_ops, |
|
}, |
|
.probe = bu21013_probe, |
|
.remove = bu21013_remove, |
|
.id_table = bu21013_id, |
|
}; |
|
|
|
module_i2c_driver(bu21013_driver); |
|
|
|
MODULE_LICENSE("GPL v2"); |
|
MODULE_AUTHOR("Naveen Kumar G <[email protected]>"); |
|
MODULE_DESCRIPTION("bu21013 touch screen controller driver");
|
|
|