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linux/drivers/input/touchscreen/st1232.c

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// SPDX-License-Identifier: GPL-2.0
/*
* ST1232 Touchscreen Controller Driver
*
* Copyright (C) 2010 Renesas Solutions Corp.
* Tony SIM <chinyeow.sim.xt@renesas.com>
*
* Using code from:
* - android.git.kernel.org: projects/kernel/common.git: synaptics_i2c_rmi.c
* Copyright (C) 2007 Google, Inc.
*/
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/input/touchscreen.h>
#define ST1232_TS_NAME "st1232-ts"
#define ST1633_TS_NAME "st1633-ts"
struct st1232_ts_finger {
u16 x;
u16 y;
u8 t;
bool is_valid;
};
struct st_chip_info {
bool have_z;
u16 max_x;
u16 max_y;
u16 max_area;
u16 max_fingers;
u8 start_reg;
};
struct st1232_ts_data {
struct i2c_client *client;
struct input_dev *input_dev;
struct touchscreen_properties prop;
struct dev_pm_qos_request low_latency_req;
struct gpio_desc *reset_gpio;
const struct st_chip_info *chip_info;
int read_buf_len;
u8 *read_buf;
struct st1232_ts_finger *finger;
};
static int st1232_ts_read_data(struct st1232_ts_data *ts)
{
struct st1232_ts_finger *finger = ts->finger;
struct i2c_client *client = ts->client;
struct i2c_msg msg[2];
int error;
int i, y;
u8 start_reg = ts->chip_info->start_reg;
u8 *buf = ts->read_buf;
/* read touchscreen data */
msg[0].addr = client->addr;
msg[0].flags = 0;
msg[0].len = 1;
msg[0].buf = &start_reg;
msg[1].addr = ts->client->addr;
msg[1].flags = I2C_M_RD;
msg[1].len = ts->read_buf_len;
msg[1].buf = buf;
error = i2c_transfer(client->adapter, msg, 2);
if (error < 0)
return error;
for (i = 0, y = 0; i < ts->chip_info->max_fingers; i++, y += 3) {
finger[i].is_valid = buf[i + y] >> 7;
if (finger[i].is_valid) {
finger[i].x = ((buf[i + y] & 0x0070) << 4) | buf[i + 1];
finger[i].y = ((buf[i + y] & 0x0007) << 8) | buf[i + 2];
/* st1232 includes a z-axis / touch strength */
if (ts->chip_info->have_z)
finger[i].t = buf[i + 6];
}
}
return 0;
}
static irqreturn_t st1232_ts_irq_handler(int irq, void *dev_id)
{
struct st1232_ts_data *ts = dev_id;
struct st1232_ts_finger *finger = ts->finger;
struct input_dev *input_dev = ts->input_dev;
int count = 0;
int i, ret;
ret = st1232_ts_read_data(ts);
if (ret < 0)
goto end;
/* multi touch protocol */
for (i = 0; i < ts->chip_info->max_fingers; i++) {
if (!finger[i].is_valid)
continue;
if (ts->chip_info->have_z)
input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR,
finger[i].t);
touchscreen_report_pos(input_dev, &ts->prop,
finger[i].x, finger[i].y, true);
input_mt_sync(input_dev);
count++;
}
/* SYN_MT_REPORT only if no contact */
if (!count) {
input_mt_sync(input_dev);
if (ts->low_latency_req.dev) {
dev_pm_qos_remove_request(&ts->low_latency_req);
ts->low_latency_req.dev = NULL;
}
} else if (!ts->low_latency_req.dev) {
/* First contact, request 100 us latency. */
dev_pm_qos_add_ancestor_request(&ts->client->dev,
&ts->low_latency_req,
DEV_PM_QOS_RESUME_LATENCY, 100);
}
/* SYN_REPORT */
input_sync(input_dev);
end:
return IRQ_HANDLED;
}
static void st1232_ts_power(struct st1232_ts_data *ts, bool poweron)
{
if (ts->reset_gpio)
gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
}
static const struct st_chip_info st1232_chip_info = {
.have_z = true,
.max_x = 0x31f, /* 800 - 1 */
.max_y = 0x1df, /* 480 -1 */
.max_area = 0xff,
.max_fingers = 2,
.start_reg = 0x12,
};
static const struct st_chip_info st1633_chip_info = {
.have_z = false,
.max_x = 0x13f, /* 320 - 1 */
.max_y = 0x1df, /* 480 -1 */
.max_area = 0x00,
.max_fingers = 5,
.start_reg = 0x12,
};
static int st1232_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const struct st_chip_info *match;
struct st1232_ts_data *ts;
struct st1232_ts_finger *finger;
struct input_dev *input_dev;
int error;
match = device_get_match_data(&client->dev);
if (!match && id)
match = (const void *)id->driver_data;
if (!match) {
dev_err(&client->dev, "unknown device model\n");
return -ENODEV;
}
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
dev_err(&client->dev, "need I2C_FUNC_I2C\n");
return -EIO;
}
if (!client->irq) {
dev_err(&client->dev, "no IRQ?\n");
return -EINVAL;
}
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
ts->chip_info = match;
ts->finger = devm_kcalloc(&client->dev,
ts->chip_info->max_fingers, sizeof(*finger),
GFP_KERNEL);
if (!ts->finger)
return -ENOMEM;
/* allocate a buffer according to the number of registers to read */
ts->read_buf_len = ts->chip_info->max_fingers * 4;
ts->read_buf = devm_kzalloc(&client->dev, ts->read_buf_len, GFP_KERNEL);
if (!ts->read_buf)
return -ENOMEM;
input_dev = devm_input_allocate_device(&client->dev);
if (!input_dev)
return -ENOMEM;
ts->client = client;
ts->input_dev = input_dev;
ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
GPIOD_OUT_HIGH);
if (IS_ERR(ts->reset_gpio)) {
error = PTR_ERR(ts->reset_gpio);
dev_err(&client->dev, "Unable to request GPIO pin: %d.\n",
error);
return error;
}
st1232_ts_power(ts, true);
input_dev->name = "st1232-touchscreen";
input_dev->id.bustype = BUS_I2C;
input_dev->dev.parent = &client->dev;
__set_bit(INPUT_PROP_DIRECT, input_dev->propbit);
__set_bit(EV_SYN, input_dev->evbit);
__set_bit(EV_KEY, input_dev->evbit);
__set_bit(EV_ABS, input_dev->evbit);
if (ts->chip_info->have_z)
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0,
ts->chip_info->max_area, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_X,
0, ts->chip_info->max_x, 0, 0);
input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
0, ts->chip_info->max_y, 0, 0);
touchscreen_parse_properties(input_dev, true, &ts->prop);
error = devm_request_threaded_irq(&client->dev, client->irq,
NULL, st1232_ts_irq_handler,
IRQF_ONESHOT,
client->name, ts);
if (error) {
dev_err(&client->dev, "Failed to register interrupt\n");
return error;
}
error = input_register_device(ts->input_dev);
if (error) {
dev_err(&client->dev, "Unable to register %s input device\n",
input_dev->name);
return error;
}
i2c_set_clientdata(client, ts);
device_init_wakeup(&client->dev, 1);
return 0;
}
static int st1232_ts_remove(struct i2c_client *client)
{
struct st1232_ts_data *ts = i2c_get_clientdata(client);
st1232_ts_power(ts, false);
return 0;
}
static int __maybe_unused st1232_ts_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct st1232_ts_data *ts = i2c_get_clientdata(client);
if (device_may_wakeup(&client->dev)) {
enable_irq_wake(client->irq);
} else {
disable_irq(client->irq);
st1232_ts_power(ts, false);
}
return 0;
}
static int __maybe_unused st1232_ts_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct st1232_ts_data *ts = i2c_get_clientdata(client);
if (device_may_wakeup(&client->dev)) {
disable_irq_wake(client->irq);
} else {
st1232_ts_power(ts, true);
enable_irq(client->irq);
}
return 0;
}
static SIMPLE_DEV_PM_OPS(st1232_ts_pm_ops,
st1232_ts_suspend, st1232_ts_resume);
static const struct i2c_device_id st1232_ts_id[] = {
{ ST1232_TS_NAME, (unsigned long)&st1232_chip_info },
{ ST1633_TS_NAME, (unsigned long)&st1633_chip_info },
{ }
};
MODULE_DEVICE_TABLE(i2c, st1232_ts_id);
static const struct of_device_id st1232_ts_dt_ids[] = {
{ .compatible = "sitronix,st1232", .data = &st1232_chip_info },
{ .compatible = "sitronix,st1633", .data = &st1633_chip_info },
{ }
};
MODULE_DEVICE_TABLE(of, st1232_ts_dt_ids);
static struct i2c_driver st1232_ts_driver = {
.probe = st1232_ts_probe,
.remove = st1232_ts_remove,
.id_table = st1232_ts_id,
.driver = {
.name = ST1232_TS_NAME,
.of_match_table = st1232_ts_dt_ids,
.pm = &st1232_ts_pm_ops,
},
};
module_i2c_driver(st1232_ts_driver);
MODULE_AUTHOR("Tony SIM <chinyeow.sim.xt@renesas.com>");
MODULE_AUTHOR("Martin Kepplinger <martin.kepplinger@ginzinger.com>");
MODULE_DESCRIPTION("SITRONIX ST1232 Touchscreen Controller Driver");
MODULE_LICENSE("GPL v2");
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