blob: 199cf3daec10661d13e248cec654b3fddd3b4ae6 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/sizes.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#define ILI2XXX_POLL_PERIOD 20
#define ILI210X_DATA_SIZE 64
#define ILI211X_DATA_SIZE 43
#define ILI251X_DATA_SIZE1 31
#define ILI251X_DATA_SIZE2 20
/* Touchscreen commands */
#define REG_TOUCHDATA 0x10
#define REG_PANEL_INFO 0x20
#define REG_CALIBRATE 0xcc
struct ili2xxx_chip {
int (*read_reg)(struct i2c_client *client, u8 reg,
void *buf, size_t len);
int (*get_touch_data)(struct i2c_client *client, u8 *data);
bool (*parse_touch_data)(const u8 *data, unsigned int finger,
unsigned int *x, unsigned int *y);
bool (*continue_polling)(const u8 *data, bool touch);
unsigned int max_touches;
unsigned int resolution;
bool has_calibrate_reg;
};
struct ili210x {
struct i2c_client *client;
struct input_dev *input;
struct gpio_desc *reset_gpio;
struct touchscreen_properties prop;
const struct ili2xxx_chip *chip;
bool stop;
};
static int ili210x_read_reg(struct i2c_client *client,
u8 reg, void *buf, size_t len)
{
struct i2c_msg msg[] = {
{
.addr = client->addr,
.flags = 0,
.len = 1,
.buf = &reg,
},
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = buf,
}
};
int error, ret;
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
if (ret != ARRAY_SIZE(msg)) {
error = ret < 0 ? ret : -EIO;
dev_err(&client->dev, "%s failed: %d\n", __func__, error);
return error;
}
return 0;
}
static int ili210x_read_touch_data(struct i2c_client *client, u8 *data)
{
return ili210x_read_reg(client, REG_TOUCHDATA,
data, ILI210X_DATA_SIZE);
}
static bool ili210x_touchdata_to_coords(const u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y)
{
if (touchdata[0] & BIT(finger))
return false;
*x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);
*y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2);
return true;
}
static bool ili210x_check_continue_polling(const u8 *data, bool touch)
{
return data[0] & 0xf3;
}
static const struct ili2xxx_chip ili210x_chip = {
.read_reg = ili210x_read_reg,
.get_touch_data = ili210x_read_touch_data,
.parse_touch_data = ili210x_touchdata_to_coords,
.continue_polling = ili210x_check_continue_polling,
.max_touches = 2,
.has_calibrate_reg = true,
};
static int ili211x_read_touch_data(struct i2c_client *client, u8 *data)
{
s16 sum = 0;
int error;
int ret;
int i;
ret = i2c_master_recv(client, data, ILI211X_DATA_SIZE);
if (ret != ILI211X_DATA_SIZE) {
error = ret < 0 ? ret : -EIO;
dev_err(&client->dev, "%s failed: %d\n", __func__, error);
return error;
}
/* This chip uses custom checksum at the end of data */
for (i = 0; i < ILI211X_DATA_SIZE - 1; i++)
sum = (sum + data[i]) & 0xff;
if ((-sum & 0xff) != data[ILI211X_DATA_SIZE - 1]) {
dev_err(&client->dev,
"CRC error (crc=0x%02x expected=0x%02x)\n",
sum, data[ILI211X_DATA_SIZE - 1]);
return -EIO;
}
return 0;
}
static bool ili211x_touchdata_to_coords(const u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y)
{
u32 data;
data = get_unaligned_be32(touchdata + 1 + (finger * 4) + 0);
if (data == 0xffffffff) /* Finger up */
return false;
*x = ((touchdata[1 + (finger * 4) + 0] & 0xf0) << 4) |
touchdata[1 + (finger * 4) + 1];
*y = ((touchdata[1 + (finger * 4) + 0] & 0x0f) << 8) |
touchdata[1 + (finger * 4) + 2];
return true;
}
static bool ili211x_decline_polling(const u8 *data, bool touch)
{
return false;
}
static const struct ili2xxx_chip ili211x_chip = {
.read_reg = ili210x_read_reg,
.get_touch_data = ili211x_read_touch_data,
.parse_touch_data = ili211x_touchdata_to_coords,
.continue_polling = ili211x_decline_polling,
.max_touches = 10,
.resolution = 2048,
};
static bool ili212x_touchdata_to_coords(const u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y)
{
u16 val;
val = get_unaligned_be16(touchdata + 3 + (finger * 5) + 0);
if (!(val & BIT(15))) /* Touch indication */
return false;
*x = val & 0x3fff;
*y = get_unaligned_be16(touchdata + 3 + (finger * 5) + 2);
return true;
}
static bool ili212x_check_continue_polling(const u8 *data, bool touch)
{
return touch;
}
static const struct ili2xxx_chip ili212x_chip = {
.read_reg = ili210x_read_reg,
.get_touch_data = ili210x_read_touch_data,
.parse_touch_data = ili212x_touchdata_to_coords,
.continue_polling = ili212x_check_continue_polling,
.max_touches = 10,
.has_calibrate_reg = true,
};
static int ili251x_read_reg(struct i2c_client *client,
u8 reg, void *buf, size_t len)
{
int error;
int ret;
ret = i2c_master_send(client, &reg, 1);
if (ret == 1) {
usleep_range(5000, 5500);
ret = i2c_master_recv(client, buf, len);
if (ret == len)
return 0;
}
error = ret < 0 ? ret : -EIO;
dev_err(&client->dev, "%s failed: %d\n", __func__, error);
return ret;
}
static int ili251x_read_touch_data(struct i2c_client *client, u8 *data)
{
int error;
error = ili251x_read_reg(client, REG_TOUCHDATA,
data, ILI251X_DATA_SIZE1);
if (!error && data[0] == 2) {
error = i2c_master_recv(client, data + ILI251X_DATA_SIZE1,
ILI251X_DATA_SIZE2);
if (error >= 0 && error != ILI251X_DATA_SIZE2)
error = -EIO;
}
return error;
}
static bool ili251x_touchdata_to_coords(const u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y)
{
u16 val;
val = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0);
if (!(val & BIT(15))) /* Touch indication */
return false;
*x = val & 0x3fff;
*y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2);
return true;
}
static bool ili251x_check_continue_polling(const u8 *data, bool touch)
{
return touch;
}
static const struct ili2xxx_chip ili251x_chip = {
.read_reg = ili251x_read_reg,
.get_touch_data = ili251x_read_touch_data,
.parse_touch_data = ili251x_touchdata_to_coords,
.continue_polling = ili251x_check_continue_polling,
.max_touches = 10,
.has_calibrate_reg = true,
};
static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
{
struct input_dev *input = priv->input;
int i;
bool contact = false, touch;
unsigned int x = 0, y = 0;
for (i = 0; i < priv->chip->max_touches; i++) {
touch = priv->chip->parse_touch_data(touchdata, i, &x, &y);
input_mt_slot(input, i);
if (input_mt_report_slot_state(input, MT_TOOL_FINGER, touch)) {
touchscreen_report_pos(input, &priv->prop, x, y, true);
contact = true;
}
}
input_mt_report_pointer_emulation(input, false);
input_sync(input);
return contact;
}
static irqreturn_t ili210x_irq(int irq, void *irq_data)
{
struct ili210x *priv = irq_data;
struct i2c_client *client = priv->client;
const struct ili2xxx_chip *chip = priv->chip;
u8 touchdata[ILI210X_DATA_SIZE] = { 0 };
bool keep_polling;
bool touch;
int error;
do {
error = chip->get_touch_data(client, touchdata);
if (error) {
dev_err(&client->dev,
"Unable to get touch data: %d\n", error);
break;
}
touch = ili210x_report_events(priv, touchdata);
keep_polling = chip->continue_polling(touchdata, touch);
if (keep_polling)
msleep(ILI2XXX_POLL_PERIOD);
} while (!priv->stop && keep_polling);
return IRQ_HANDLED;
}
static ssize_t ili210x_calibrate(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
unsigned long calibrate;
int rc;
u8 cmd = REG_CALIBRATE;
if (kstrtoul(buf, 10, &calibrate))
return -EINVAL;
if (calibrate > 1)
return -EINVAL;
if (calibrate) {
rc = i2c_master_send(priv->client, &cmd, sizeof(cmd));
if (rc != sizeof(cmd))
return -EIO;
}
return count;
}
static DEVICE_ATTR(calibrate, S_IWUSR, NULL, ili210x_calibrate);
static struct attribute *ili210x_attributes[] = {
&dev_attr_calibrate.attr,
NULL,
};
static umode_t ili210x_calibrate_visible(struct kobject *kobj,
struct attribute *attr, int index)
{
struct device *dev = kobj_to_dev(kobj);
struct i2c_client *client = to_i2c_client(dev);
struct ili210x *priv = i2c_get_clientdata(client);
return priv->chip->has_calibrate_reg ? attr->mode : 0;
}
static const struct attribute_group ili210x_attr_group = {
.attrs = ili210x_attributes,
.is_visible = ili210x_calibrate_visible,
};
static void ili210x_power_down(void *data)
{
struct gpio_desc *reset_gpio = data;
gpiod_set_value_cansleep(reset_gpio, 1);
}
static void ili210x_stop(void *data)
{
struct ili210x *priv = data;
/* Tell ISR to quit even if there is a contact. */
priv->stop = true;
}
static int ili210x_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
const struct ili2xxx_chip *chip;
struct ili210x *priv;
struct gpio_desc *reset_gpio;
struct input_dev *input;
int error;
unsigned int max_xy;
dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
chip = device_get_match_data(dev);
if (!chip && id)
chip = (const struct ili2xxx_chip *)id->driver_data;
if (!chip) {
dev_err(&client->dev, "unknown device model\n");
return -ENODEV;
}
if (client->irq <= 0) {
dev_err(dev, "No IRQ!\n");
return -EINVAL;
}
reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(reset_gpio))
return PTR_ERR(reset_gpio);
if (reset_gpio) {
error = devm_add_action_or_reset(dev, ili210x_power_down,
reset_gpio);
if (error)
return error;
usleep_range(50, 100);
gpiod_set_value_cansleep(reset_gpio, 0);
msleep(100);
}
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
priv->client = client;
priv->input = input;
priv->reset_gpio = reset_gpio;
priv->chip = chip;
i2c_set_clientdata(client, priv);
/* Setup input device */
input->name = "ILI210x Touchscreen";
input->id.bustype = BUS_I2C;
/* Multi touch */
max_xy = (chip->resolution ?: SZ_64K) - 1;
input_set_abs_params(input, ABS_MT_POSITION_X, 0, max_xy, 0, 0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, max_xy, 0, 0);
touchscreen_parse_properties(input, true, &priv->prop);
error = input_mt_init_slots(input, priv->chip->max_touches,
INPUT_MT_DIRECT);
if (error) {
dev_err(dev, "Unable to set up slots, err: %d\n", error);
return error;
}
error = devm_request_threaded_irq(dev, client->irq, NULL, ili210x_irq,
IRQF_ONESHOT, client->name, priv);
if (error) {
dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
error);
return error;
}
error = devm_add_action_or_reset(dev, ili210x_stop, priv);
if (error)
return error;
error = devm_device_add_group(dev, &ili210x_attr_group);
if (error) {
dev_err(dev, "Unable to create sysfs attributes, err: %d\n",
error);
return error;
}
error = input_register_device(priv->input);
if (error) {
dev_err(dev, "Cannot register input device, err: %d\n", error);
return error;
}
return 0;
}
static const struct i2c_device_id ili210x_i2c_id[] = {
{ "ili210x", (long)&ili210x_chip },
{ "ili2117", (long)&ili211x_chip },
{ "ili2120", (long)&ili212x_chip },
{ "ili251x", (long)&ili251x_chip },
{ }
};
MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
static const struct of_device_id ili210x_dt_ids[] = {
{ .compatible = "ilitek,ili210x", .data = &ili210x_chip },
{ .compatible = "ilitek,ili2117", .data = &ili211x_chip },
{ .compatible = "ilitek,ili2120", .data = &ili212x_chip },
{ .compatible = "ilitek,ili251x", .data = &ili251x_chip },
{ }
};
MODULE_DEVICE_TABLE(of, ili210x_dt_ids);
static struct i2c_driver ili210x_ts_driver = {
.driver = {
.name = "ili210x_i2c",
.of_match_table = ili210x_dt_ids,
},
.id_table = ili210x_i2c_id,
.probe = ili210x_i2c_probe,
};
module_i2c_driver(ili210x_ts_driver);
MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver");
MODULE_LICENSE("GPL");