Commit 49588917 authored by Marek Vasut's avatar Marek Vasut Committed by Dmitry Torokhov

Input: ili210x - add ILI251X support

Add support for ILI251x touch controller. This controller is similar
to the ILI210x, except for the following differences:
- Does not support I2C R-W transfer, Read must be followed by an
  obscenely long delay, and then followed by Write
- Does support 10 simultaneous touch inputs.
- Touch data format is slightly different, pressure reporting does not
  work although the touch data contain such information.
Signed-off-by: default avatarMarek Vasut <marex@denx.de>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent c5d0e4b5
......@@ -7,9 +7,11 @@
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/gpio/consumer.h>
#include <linux/of_device.h>
#include <asm/unaligned.h>
#define MAX_TOUCHES 2
#define ILI210X_TOUCHES 2
#define ILI251X_TOUCHES 10
#define DEFAULT_POLL_PERIOD 20
/* Touchscreen commands */
......@@ -33,17 +35,25 @@ struct firmware_version {
u8 minor;
} __packed;
enum ili2xxx_model {
MODEL_ILI210X,
MODEL_ILI251X,
};
struct ili210x {
struct i2c_client *client;
struct input_dev *input;
unsigned int poll_period;
struct delayed_work dwork;
struct gpio_desc *reset_gpio;
enum ili2xxx_model model;
unsigned int max_touches;
};
static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
size_t len)
{
struct ili210x *priv = i2c_get_clientdata(client);
struct i2c_msg msg[2] = {
{
.addr = client->addr,
......@@ -59,7 +69,38 @@ static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
}
};
if (i2c_transfer(client->adapter, msg, 2) != 2) {
if (priv->model == MODEL_ILI251X) {
if (i2c_transfer(client->adapter, msg, 1) != 1) {
dev_err(&client->dev, "i2c transfer failed\n");
return -EIO;
}
usleep_range(5000, 5500);
if (i2c_transfer(client->adapter, msg + 1, 1) != 1) {
dev_err(&client->dev, "i2c transfer failed\n");
return -EIO;
}
} else {
if (i2c_transfer(client->adapter, msg, 2) != 2) {
dev_err(&client->dev, "i2c transfer failed\n");
return -EIO;
}
}
return 0;
}
static int ili210x_read(struct i2c_client *client, void *buf, size_t len)
{
struct i2c_msg msg = {
.addr = client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = buf,
};
if (i2c_transfer(client->adapter, &msg, 1) != 1) {
dev_err(&client->dev, "i2c transfer failed\n");
return -EIO;
}
......@@ -71,7 +112,7 @@ static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y)
{
if (finger >= MAX_TOUCHES)
if (finger >= ILI210X_TOUCHES)
return false;
if (touchdata[0] & BIT(finger))
......@@ -83,17 +124,43 @@ static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
return true;
}
static bool ili251x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
unsigned int finger,
unsigned int *x, unsigned int *y)
{
if (finger >= ILI251X_TOUCHES)
return false;
*x = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0);
if (!(*x & BIT(15))) /* Touch indication */
return false;
*x &= 0x3fff;
*y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2);
return true;
}
static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
{
struct input_dev *input = priv->input;
int i;
bool touch;
unsigned int x, y;
bool contact = false, touch = false;
unsigned int x = 0, y = 0;
for (i = 0; i < MAX_TOUCHES; i++) {
for (i = 0; i < priv->max_touches; i++) {
input_mt_slot(input, i);
touch = ili210x_touchdata_to_coords(priv, touchdata, i, &x, &y);
if (priv->model == MODEL_ILI210X) {
touch = ili210x_touchdata_to_coords(priv, touchdata,
i, &x, &y);
} else if (priv->model == MODEL_ILI251X) {
touch = ili251x_touchdata_to_coords(priv, touchdata,
i, &x, &y);
if (touch)
contact = true;
}
input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
if (touch) {
input_report_abs(input, ABS_MT_POSITION_X, x);
......@@ -104,7 +171,10 @@ static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
input_mt_report_pointer_emulation(input, false);
input_sync(input);
return touchdata[0] & 0xf3;
if (priv->model == MODEL_ILI210X)
contact = touchdata[0] & 0xf3;
return contact;
}
static void ili210x_work(struct work_struct *work)
......@@ -112,12 +182,20 @@ static void ili210x_work(struct work_struct *work)
struct ili210x *priv = container_of(work, struct ili210x,
dwork.work);
struct i2c_client *client = priv->client;
u8 touchdata[1 + 4 * MAX_TOUCHES];
u8 touchdata[64] = { 0 };
bool touch;
int error;
int error = -EINVAL;
if (priv->model == MODEL_ILI210X) {
error = ili210x_read_reg(client, REG_TOUCHDATA,
touchdata, sizeof(touchdata));
} else if (priv->model == MODEL_ILI251X) {
error = ili210x_read_reg(client, REG_TOUCHDATA,
touchdata, 31);
if (!error && touchdata[0] == 2)
error = ili210x_read(client, &touchdata[31], 20);
}
error = ili210x_read_reg(client, REG_TOUCHDATA,
touchdata, sizeof(touchdata));
if (error) {
dev_err(&client->dev,
"Unable to get touchdata, err = %d\n", error);
......@@ -198,9 +276,12 @@ static int ili210x_i2c_probe(struct i2c_client *client,
struct input_dev *input;
struct panel_info panel;
struct firmware_version firmware;
enum ili2xxx_model model;
int xmax, ymax;
int error;
model = (enum ili2xxx_model)id->driver_data;
dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
if (client->irq <= 0) {
......@@ -236,6 +317,11 @@ static int ili210x_i2c_probe(struct i2c_client *client,
priv->poll_period = DEFAULT_POLL_PERIOD;
INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
priv->reset_gpio = reset_gpio;
priv->model = model;
if (model == MODEL_ILI210X)
priv->max_touches = ILI210X_TOUCHES;
if (model == MODEL_ILI251X)
priv->max_touches = ILI251X_TOUCHES;
i2c_set_clientdata(client, priv);
......@@ -274,7 +360,7 @@ static int ili210x_i2c_probe(struct i2c_client *client,
input_set_abs_params(input, ABS_Y, 0, ymax, 0, 0);
/* Multi touch */
input_mt_init_slots(input, MAX_TOUCHES, 0);
input_mt_init_slots(input, priv->max_touches, 0);
input_set_abs_params(input, ABS_MT_POSITION_X, 0, xmax, 0, 0);
input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ymax, 0, 0);
......@@ -347,13 +433,15 @@ static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm,
ili210x_i2c_suspend, ili210x_i2c_resume);
static const struct i2c_device_id ili210x_i2c_id[] = {
{ "ili210x", 0 },
{ "ili210x", MODEL_ILI210X },
{ "ili251x", MODEL_ILI251X },
{ }
};
MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
static const struct of_device_id ili210x_dt_ids[] = {
{ .compatible = "ilitek,ili210x", },
{ .compatible = "ilitek,ili210x", .data = (void *)MODEL_ILI210X },
{ .compatible = "ilitek,ili251x", .data = (void *)MODEL_ILI251X },
{ },
};
MODULE_DEVICE_TABLE(of, ili210x_dt_ids);
......
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