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Release 4.11 drivers/input/touchscreen/egalax_ts.c

/*
 * 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/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; }

Contributors

PersonTokensPropCommitsCommitProp
Jiejing Zhang308100.00%1100.00%
Total308100.00%1100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jiejing Zhang7965.29%150.00%
Jason (Hui) Wang4234.71%150.00%
Total121100.00%2100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Jiejing Zhang57100.00%1100.00%
Total57100.00%1100.00%


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 error; ts = devm_kzalloc(&client->dev, sizeof(struct egalax_ts), GFP_KERNEL); if (!ts) { dev_err(&client->dev, "Failed to allocate memory\n"); return -ENOMEM; } input_dev = devm_input_allocate_device(&client->dev); if (!input_dev) { dev_err(&client->dev, "Failed to allocate memory\n"); return -ENOMEM; } 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"); return error; } error = egalax_firmware_version(client); if (error < 0) { dev_err(&client->dev, "Failed to read firmware version\n"); return error; } input_dev->name = "EETI eGalax Touch Screen"; input_dev->id.bustype = BUS_I2C; __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); error = devm_request_threaded_irq(&client->dev, 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"); return error; } error = input_register_device(ts->input_dev); if (error) return error; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Jiejing Zhang29184.84%120.00%
Andy Shevchenko319.04%120.00%
Jason (Hui) Wang185.25%120.00%
Henrik Rydberg20.58%120.00%
Heiko Abraham10.29%120.00%
Total343100.00%5100.00%

static const struct i2c_device_id egalax_ts_id[] = { { "egalax_ts", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, egalax_ts_id);
static int __maybe_unused 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; }

Contributors

PersonTokensPropCommitsCommitProp
Jiejing Zhang7498.67%150.00%
Jingoo Han11.33%150.00%
Total75100.00%2100.00%


static int __maybe_unused egalax_ts_resume(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); return egalax_wake_up_device(client); }

Contributors

PersonTokensPropCommitsCommitProp
Jiejing Zhang2796.43%150.00%
Jingoo Han13.57%150.00%
Total28100.00%2100.00%

static SIMPLE_DEV_PM_OPS(egalax_ts_pm_ops, egalax_ts_suspend, egalax_ts_resume); static const struct of_device_id egalax_ts_dt_ids[] = { { .compatible = "eeti,egalax_ts" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, egalax_ts_dt_ids); static struct i2c_driver egalax_ts_driver = { .driver = { .name = "egalax_ts", .pm = &egalax_ts_pm_ops, .of_match_table = egalax_ts_dt_ids, }, .id_table = egalax_ts_id, .probe = egalax_ts_probe, }; module_i2c_driver(egalax_ts_driver); MODULE_AUTHOR("Freescale Semiconductor, Inc."); MODULE_DESCRIPTION("Touchscreen driver for EETI eGalax touch controller"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Jiejing Zhang102988.55%111.11%
Jason (Hui) Wang877.49%111.11%
Andy Shevchenko312.67%111.11%
Javier Martinez Canillas70.60%111.11%
Jingoo Han30.26%222.22%
Henrik Rydberg20.17%111.11%
Axel Lin20.17%111.11%
Heiko Abraham10.09%111.11%
Total1162100.00%9100.00%
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