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406 lines
8.5 KiB
406 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Elo serial touchscreen driver |
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* |
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* Copyright (c) 2004 Vojtech Pavlik |
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*/ |
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/* |
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* This driver can handle serial Elo touchscreens using either the Elo standard |
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* 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo |
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* legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol. |
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*/ |
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#include <linux/errno.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/input.h> |
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#include <linux/serio.h> |
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#include <linux/ctype.h> |
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#define DRIVER_DESC "Elo serial touchscreen driver" |
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MODULE_AUTHOR("Vojtech Pavlik <[email protected]>"); |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL"); |
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/* |
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* Definitions & global arrays. |
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*/ |
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#define ELO_MAX_LENGTH 10 |
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#define ELO10_PACKET_LEN 8 |
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#define ELO10_TOUCH 0x03 |
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#define ELO10_PRESSURE 0x80 |
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#define ELO10_LEAD_BYTE 'U' |
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#define ELO10_ID_CMD 'i' |
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#define ELO10_TOUCH_PACKET 'T' |
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#define ELO10_ACK_PACKET 'A' |
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#define ELI10_ID_PACKET 'I' |
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/* |
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* Per-touchscreen data. |
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*/ |
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struct elo { |
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struct input_dev *dev; |
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struct serio *serio; |
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struct mutex cmd_mutex; |
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struct completion cmd_done; |
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int id; |
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int idx; |
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unsigned char expected_packet; |
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unsigned char csum; |
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unsigned char data[ELO_MAX_LENGTH]; |
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unsigned char response[ELO10_PACKET_LEN]; |
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char phys[32]; |
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}; |
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static void elo_process_data_10(struct elo *elo, unsigned char data) |
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{ |
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struct input_dev *dev = elo->dev; |
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elo->data[elo->idx] = data; |
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switch (elo->idx++) { |
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case 0: |
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elo->csum = 0xaa; |
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if (data != ELO10_LEAD_BYTE) { |
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dev_dbg(&elo->serio->dev, |
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"unsynchronized data: 0x%02x\n", data); |
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elo->idx = 0; |
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} |
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break; |
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case 9: |
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elo->idx = 0; |
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if (data != elo->csum) { |
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dev_dbg(&elo->serio->dev, |
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"bad checksum: 0x%02x, expected 0x%02x\n", |
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data, elo->csum); |
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break; |
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} |
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if (elo->data[1] != elo->expected_packet) { |
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if (elo->data[1] != ELO10_TOUCH_PACKET) |
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dev_dbg(&elo->serio->dev, |
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"unexpected packet: 0x%02x\n", |
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elo->data[1]); |
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break; |
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} |
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if (likely(elo->data[1] == ELO10_TOUCH_PACKET)) { |
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input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]); |
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input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]); |
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if (elo->data[2] & ELO10_PRESSURE) |
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input_report_abs(dev, ABS_PRESSURE, |
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(elo->data[8] << 8) | elo->data[7]); |
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input_report_key(dev, BTN_TOUCH, elo->data[2] & ELO10_TOUCH); |
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input_sync(dev); |
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} else if (elo->data[1] == ELO10_ACK_PACKET) { |
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if (elo->data[2] == '0') |
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elo->expected_packet = ELO10_TOUCH_PACKET; |
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complete(&elo->cmd_done); |
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} else { |
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memcpy(elo->response, &elo->data[1], ELO10_PACKET_LEN); |
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elo->expected_packet = ELO10_ACK_PACKET; |
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} |
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break; |
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} |
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elo->csum += data; |
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} |
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static void elo_process_data_6(struct elo *elo, unsigned char data) |
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{ |
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struct input_dev *dev = elo->dev; |
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elo->data[elo->idx] = data; |
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switch (elo->idx++) { |
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case 0: |
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if ((data & 0xc0) != 0xc0) |
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elo->idx = 0; |
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break; |
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case 1: |
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if ((data & 0xc0) != 0x80) |
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elo->idx = 0; |
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break; |
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case 2: |
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if ((data & 0xc0) != 0x40) |
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elo->idx = 0; |
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break; |
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case 3: |
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if (data & 0xc0) { |
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elo->idx = 0; |
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break; |
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} |
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input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f)); |
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input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f)); |
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if (elo->id == 2) { |
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input_report_key(dev, BTN_TOUCH, 1); |
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input_sync(dev); |
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elo->idx = 0; |
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} |
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break; |
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case 4: |
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if (data) { |
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input_sync(dev); |
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elo->idx = 0; |
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} |
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break; |
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case 5: |
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if ((data & 0xf0) == 0) { |
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input_report_abs(dev, ABS_PRESSURE, elo->data[5]); |
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input_report_key(dev, BTN_TOUCH, !!elo->data[5]); |
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} |
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input_sync(dev); |
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elo->idx = 0; |
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break; |
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} |
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} |
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static void elo_process_data_3(struct elo *elo, unsigned char data) |
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{ |
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struct input_dev *dev = elo->dev; |
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elo->data[elo->idx] = data; |
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switch (elo->idx++) { |
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case 0: |
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if ((data & 0x7f) != 0x01) |
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elo->idx = 0; |
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break; |
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case 2: |
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input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80)); |
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input_report_abs(dev, ABS_X, elo->data[1]); |
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input_report_abs(dev, ABS_Y, elo->data[2]); |
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input_sync(dev); |
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elo->idx = 0; |
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break; |
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} |
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} |
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static irqreturn_t elo_interrupt(struct serio *serio, |
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unsigned char data, unsigned int flags) |
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{ |
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struct elo *elo = serio_get_drvdata(serio); |
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switch (elo->id) { |
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case 0: |
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elo_process_data_10(elo, data); |
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break; |
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case 1: |
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case 2: |
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elo_process_data_6(elo, data); |
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break; |
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case 3: |
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elo_process_data_3(elo, data); |
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break; |
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} |
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return IRQ_HANDLED; |
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} |
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static int elo_command_10(struct elo *elo, unsigned char *packet) |
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{ |
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int rc = -1; |
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int i; |
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unsigned char csum = 0xaa + ELO10_LEAD_BYTE; |
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mutex_lock(&elo->cmd_mutex); |
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serio_pause_rx(elo->serio); |
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elo->expected_packet = toupper(packet[0]); |
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init_completion(&elo->cmd_done); |
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serio_continue_rx(elo->serio); |
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if (serio_write(elo->serio, ELO10_LEAD_BYTE)) |
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goto out; |
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for (i = 0; i < ELO10_PACKET_LEN; i++) { |
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csum += packet[i]; |
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if (serio_write(elo->serio, packet[i])) |
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goto out; |
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} |
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if (serio_write(elo->serio, csum)) |
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goto out; |
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wait_for_completion_timeout(&elo->cmd_done, HZ); |
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if (elo->expected_packet == ELO10_TOUCH_PACKET) { |
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/* We are back in reporting mode, the command was ACKed */ |
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memcpy(packet, elo->response, ELO10_PACKET_LEN); |
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rc = 0; |
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} |
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out: |
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mutex_unlock(&elo->cmd_mutex); |
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return rc; |
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} |
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static int elo_setup_10(struct elo *elo) |
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{ |
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static const char *elo_types[] = { "Accu", "Dura", "Intelli", "Carroll" }; |
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struct input_dev *dev = elo->dev; |
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unsigned char packet[ELO10_PACKET_LEN] = { ELO10_ID_CMD }; |
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if (elo_command_10(elo, packet)) |
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return -1; |
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dev->id.version = (packet[5] << 8) | packet[4]; |
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input_set_abs_params(dev, ABS_X, 96, 4000, 0, 0); |
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input_set_abs_params(dev, ABS_Y, 96, 4000, 0, 0); |
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if (packet[3] & ELO10_PRESSURE) |
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input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0); |
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dev_info(&elo->serio->dev, |
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"%sTouch touchscreen, fw: %02x.%02x, features: 0x%02x, controller: 0x%02x\n", |
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elo_types[(packet[1] -'0') & 0x03], |
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packet[5], packet[4], packet[3], packet[7]); |
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return 0; |
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} |
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/* |
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* elo_disconnect() is the opposite of elo_connect() |
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*/ |
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static void elo_disconnect(struct serio *serio) |
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{ |
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struct elo *elo = serio_get_drvdata(serio); |
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input_get_device(elo->dev); |
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input_unregister_device(elo->dev); |
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serio_close(serio); |
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serio_set_drvdata(serio, NULL); |
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input_put_device(elo->dev); |
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kfree(elo); |
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} |
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/* |
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* elo_connect() is the routine that is called when someone adds a |
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* new serio device that supports Gunze protocol and registers it as |
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* an input device. |
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*/ |
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static int elo_connect(struct serio *serio, struct serio_driver *drv) |
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{ |
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struct elo *elo; |
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struct input_dev *input_dev; |
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int err; |
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elo = kzalloc(sizeof(struct elo), GFP_KERNEL); |
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input_dev = input_allocate_device(); |
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if (!elo || !input_dev) { |
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err = -ENOMEM; |
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goto fail1; |
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} |
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elo->serio = serio; |
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elo->id = serio->id.id; |
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elo->dev = input_dev; |
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elo->expected_packet = ELO10_TOUCH_PACKET; |
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mutex_init(&elo->cmd_mutex); |
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init_completion(&elo->cmd_done); |
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snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys); |
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input_dev->name = "Elo Serial TouchScreen"; |
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input_dev->phys = elo->phys; |
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input_dev->id.bustype = BUS_RS232; |
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input_dev->id.vendor = SERIO_ELO; |
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input_dev->id.product = elo->id; |
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input_dev->id.version = 0x0100; |
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input_dev->dev.parent = &serio->dev; |
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
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serio_set_drvdata(serio, elo); |
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err = serio_open(serio, drv); |
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if (err) |
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goto fail2; |
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switch (elo->id) { |
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case 0: /* 10-byte protocol */ |
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if (elo_setup_10(elo)) { |
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err = -EIO; |
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goto fail3; |
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} |
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break; |
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case 1: /* 6-byte protocol */ |
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0); |
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fallthrough; |
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case 2: /* 4-byte protocol */ |
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input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0); |
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input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0); |
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break; |
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case 3: /* 3-byte protocol */ |
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input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0); |
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input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0); |
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break; |
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} |
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err = input_register_device(elo->dev); |
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if (err) |
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goto fail3; |
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return 0; |
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fail3: serio_close(serio); |
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fail2: serio_set_drvdata(serio, NULL); |
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fail1: input_free_device(input_dev); |
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kfree(elo); |
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return err; |
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} |
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/* |
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* The serio driver structure. |
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*/ |
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static const struct serio_device_id elo_serio_ids[] = { |
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{ |
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.type = SERIO_RS232, |
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.proto = SERIO_ELO, |
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.id = SERIO_ANY, |
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.extra = SERIO_ANY, |
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}, |
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{ 0 } |
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}; |
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MODULE_DEVICE_TABLE(serio, elo_serio_ids); |
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static struct serio_driver elo_drv = { |
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.driver = { |
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.name = "elo", |
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}, |
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.description = DRIVER_DESC, |
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.id_table = elo_serio_ids, |
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.interrupt = elo_interrupt, |
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.connect = elo_connect, |
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.disconnect = elo_disconnect, |
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}; |
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module_serio_driver(elo_drv);
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