| /* |
| * Driver for EETI eGalax Multiple Touch Controller |
| * |
| * Copyright (C) 2011 Freescale Semiconductor, Inc. |
| * |
| * based on max11801_ts.c |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| /* EETI eGalax serial touch screen controller is a I2C based multiple |
| * touch screen controller, it supports 5 point multiple touch. */ |
| |
| /* TODO: |
| - auto idle mode support |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/i2c.h> |
| #include <linux/interrupt.h> |
| #include <linux/input.h> |
| #include <linux/irq.h> |
| #include <linux/gpio.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/bitops.h> |
| #include <linux/input/mt.h> |
| #include <linux/of_gpio.h> |
| |
| /* |
| * Mouse Mode: some panel may configure the controller to mouse mode, |
| * which can only report one point at a given time. |
| * This driver will ignore events in this mode. |
| */ |
| #define REPORT_MODE_MOUSE 0x1 |
| /* |
| * Vendor Mode: this mode is used to transfer some vendor specific |
| * messages. |
| * This driver will ignore events in this mode. |
| */ |
| #define REPORT_MODE_VENDOR 0x3 |
| /* Multiple Touch Mode */ |
| #define REPORT_MODE_MTTOUCH 0x4 |
| |
| #define MAX_SUPPORT_POINTS 5 |
| |
| #define EVENT_VALID_OFFSET 7 |
| #define EVENT_VALID_MASK (0x1 << EVENT_VALID_OFFSET) |
| #define EVENT_ID_OFFSET 2 |
| #define EVENT_ID_MASK (0xf << EVENT_ID_OFFSET) |
| #define EVENT_IN_RANGE (0x1 << 1) |
| #define EVENT_DOWN_UP (0X1 << 0) |
| |
| #define MAX_I2C_DATA_LEN 10 |
| |
| #define EGALAX_MAX_X 32760 |
| #define EGALAX_MAX_Y 32760 |
| #define EGALAX_MAX_TRIES 100 |
| |
| struct egalax_ts { |
| struct i2c_client *client; |
| struct input_dev *input_dev; |
| }; |
| |
| static irqreturn_t egalax_ts_interrupt(int irq, void *dev_id) |
| { |
| struct egalax_ts *ts = dev_id; |
| struct input_dev *input_dev = ts->input_dev; |
| struct i2c_client *client = ts->client; |
| u8 buf[MAX_I2C_DATA_LEN]; |
| int id, ret, x, y, z; |
| int tries = 0; |
| bool down, valid; |
| u8 state; |
| |
| do { |
| ret = i2c_master_recv(client, buf, MAX_I2C_DATA_LEN); |
| } while (ret == -EAGAIN && tries++ < EGALAX_MAX_TRIES); |
| |
| if (ret < 0) |
| return IRQ_HANDLED; |
| |
| if (buf[0] != REPORT_MODE_MTTOUCH) { |
| /* ignore mouse events and vendor events */ |
| return IRQ_HANDLED; |
| } |
| |
| state = buf[1]; |
| x = (buf[3] << 8) | buf[2]; |
| y = (buf[5] << 8) | buf[4]; |
| z = (buf[7] << 8) | buf[6]; |
| |
| valid = state & EVENT_VALID_MASK; |
| id = (state & EVENT_ID_MASK) >> EVENT_ID_OFFSET; |
| down = state & EVENT_DOWN_UP; |
| |
| if (!valid || id > MAX_SUPPORT_POINTS) { |
| dev_dbg(&client->dev, "point invalid\n"); |
| return IRQ_HANDLED; |
| } |
| |
| input_mt_slot(input_dev, id); |
| input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, down); |
| |
| dev_dbg(&client->dev, "%s id:%d x:%d y:%d z:%d", |
| down ? "down" : "up", id, x, y, z); |
| |
| if (down) { |
| input_report_abs(input_dev, ABS_MT_POSITION_X, x); |
| input_report_abs(input_dev, ABS_MT_POSITION_Y, y); |
| input_report_abs(input_dev, ABS_MT_PRESSURE, z); |
| } |
| |
| input_mt_report_pointer_emulation(input_dev, true); |
| input_sync(input_dev); |
| |
| return IRQ_HANDLED; |
| } |
| |
| /* wake up controller by an falling edge of interrupt gpio. */ |
| static int egalax_wake_up_device(struct i2c_client *client) |
| { |
| struct device_node *np = client->dev.of_node; |
| int gpio; |
| int ret; |
| |
| if (!np) |
| return -ENODEV; |
| |
| gpio = of_get_named_gpio(np, "wakeup-gpios", 0); |
| if (!gpio_is_valid(gpio)) |
| return -ENODEV; |
| |
| ret = gpio_request(gpio, "egalax_irq"); |
| if (ret < 0) { |
| dev_err(&client->dev, |
| "request gpio failed, cannot wake up controller: %d\n", |
| ret); |
| return ret; |
| } |
| |
| /* wake up controller via an falling edge on IRQ gpio. */ |
| gpio_direction_output(gpio, 0); |
| gpio_set_value(gpio, 1); |
| |
| /* controller should be waken up, return irq. */ |
| gpio_direction_input(gpio); |
| gpio_free(gpio); |
| |
| return 0; |
| } |
| |
| static int egalax_firmware_version(struct i2c_client *client) |
| { |
| static const u8 cmd[MAX_I2C_DATA_LEN] = { 0x03, 0x03, 0xa, 0x01, 0x41 }; |
| int ret; |
| |
| ret = i2c_master_send(client, cmd, MAX_I2C_DATA_LEN); |
| if (ret < 0) |
| return ret; |
| |
| return 0; |
| } |
| |
| static int egalax_ts_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| struct egalax_ts *ts; |
| struct input_dev *input_dev; |
| int ret; |
| int error; |
| |
| ts = kzalloc(sizeof(struct egalax_ts), GFP_KERNEL); |
| if (!ts) { |
| dev_err(&client->dev, "Failed to allocate memory\n"); |
| return -ENOMEM; |
| } |
| |
| input_dev = input_allocate_device(); |
| if (!input_dev) { |
| dev_err(&client->dev, "Failed to allocate memory\n"); |
| error = -ENOMEM; |
| goto err_free_ts; |
| } |
| |
| ts->client = client; |
| ts->input_dev = input_dev; |
| |
| /* controller may be in sleep, wake it up. */ |
| error = egalax_wake_up_device(client); |
| if (error) { |
| dev_err(&client->dev, "Failed to wake up the controller\n"); |
| goto err_free_dev; |
| } |
| |
| ret = egalax_firmware_version(client); |
| if (ret < 0) { |
| dev_err(&client->dev, "Failed to read firmware version\n"); |
| error = -EIO; |
| goto err_free_dev; |
| } |
| |
| input_dev->name = "EETI eGalax Touch Screen"; |
| input_dev->id.bustype = BUS_I2C; |
| input_dev->dev.parent = &client->dev; |
| |
| __set_bit(EV_ABS, input_dev->evbit); |
| __set_bit(EV_KEY, input_dev->evbit); |
| __set_bit(BTN_TOUCH, input_dev->keybit); |
| |
| input_set_abs_params(input_dev, ABS_X, 0, EGALAX_MAX_X, 0, 0); |
| input_set_abs_params(input_dev, ABS_Y, 0, EGALAX_MAX_Y, 0, 0); |
| input_set_abs_params(input_dev, |
| ABS_MT_POSITION_X, 0, EGALAX_MAX_X, 0, 0); |
| input_set_abs_params(input_dev, |
| ABS_MT_POSITION_Y, 0, EGALAX_MAX_Y, 0, 0); |
| input_mt_init_slots(input_dev, MAX_SUPPORT_POINTS, 0); |
| |
| input_set_drvdata(input_dev, ts); |
| |
| error = request_threaded_irq(client->irq, NULL, egalax_ts_interrupt, |
| IRQF_TRIGGER_LOW | IRQF_ONESHOT, |
| "egalax_ts", ts); |
| if (error < 0) { |
| dev_err(&client->dev, "Failed to register interrupt\n"); |
| goto err_free_dev; |
| } |
| |
| error = input_register_device(ts->input_dev); |
| if (error) |
| goto err_free_irq; |
| |
| i2c_set_clientdata(client, ts); |
| return 0; |
| |
| err_free_irq: |
| free_irq(client->irq, ts); |
| err_free_dev: |
| input_free_device(input_dev); |
| err_free_ts: |
| kfree(ts); |
| |
| return error; |
| } |
| |
| static int egalax_ts_remove(struct i2c_client *client) |
| { |
| struct egalax_ts *ts = i2c_get_clientdata(client); |
| |
| free_irq(client->irq, ts); |
| |
| input_unregister_device(ts->input_dev); |
| kfree(ts); |
| |
| return 0; |
| } |
| |
| static const struct i2c_device_id egalax_ts_id[] = { |
| { "egalax_ts", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, egalax_ts_id); |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int egalax_ts_suspend(struct device *dev) |
| { |
| static const u8 suspend_cmd[MAX_I2C_DATA_LEN] = { |
| 0x3, 0x6, 0xa, 0x3, 0x36, 0x3f, 0x2, 0, 0, 0 |
| }; |
| struct i2c_client *client = to_i2c_client(dev); |
| int ret; |
| |
| ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN); |
| return ret > 0 ? 0 : ret; |
| } |
| |
| static int egalax_ts_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| |
| return egalax_wake_up_device(client); |
| } |
| #endif |
| |
| static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume); |
| |
| static struct of_device_id egalax_ts_dt_ids[] = { |
| { .compatible = "eeti,egalax_ts" }, |
| { /* sentinel */ } |
| }; |
| |
| static struct i2c_driver egalax_ts_driver = { |
| .driver = { |
| .name = "egalax_ts", |
| .owner = THIS_MODULE, |
| .pm = &egalax_ts_pm_ops, |
| .of_match_table = of_match_ptr(egalax_ts_dt_ids), |
| }, |
| .id_table = egalax_ts_id, |
| .probe = egalax_ts_probe, |
| .remove = egalax_ts_remove, |
| }; |
| |
| module_i2c_driver(egalax_ts_driver); |
| |
| MODULE_AUTHOR("Freescale Semiconductor, Inc."); |
| MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller"); |
| MODULE_LICENSE("GPL"); |