mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
283 lines
6.8 KiB
283 lines
6.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Driver for EETI eGalax Multiple Touch Controller |
|
* |
|
* Copyright (C) 2011 Freescale Semiconductor, Inc. |
|
* |
|
* based on max11801_ts.c |
|
*/ |
|
|
|
/* 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; |
|
} |
|
|
|
/* 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 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; |
|
} |
|
|
|
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; |
|
|
|
if (device_may_wakeup(dev)) |
|
return enable_irq_wake(client->irq); |
|
|
|
ret = i2c_master_send(client, suspend_cmd, MAX_I2C_DATA_LEN); |
|
return ret > 0 ? 0 : ret; |
|
} |
|
|
|
static int __maybe_unused egalax_ts_resume(struct device *dev) |
|
{ |
|
struct i2c_client *client = to_i2c_client(dev); |
|
|
|
if (device_may_wakeup(dev)) |
|
return disable_irq_wake(client->irq); |
|
|
|
return egalax_wake_up_device(client); |
|
} |
|
|
|
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");
|
|
|