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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: Marek Vasut <[email protected]> Signed-off-by: Dmitry Torokhov <[email protected]>
This commit is contained in:
Marek Vasut
Dmitry Torokhov
parent
c5d0e4b515
commit
4958891764
1 changed files with 103 additions and 15 deletions
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@ -7,9 +7,11 @@
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#include <linux/delay.h>
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#include <linux/workqueue.h>
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#include <linux/gpio/consumer.h>
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#include <linux/of_device.h>
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#include <asm/unaligned.h>
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#define MAX_TOUCHES 2
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#define ILI210X_TOUCHES 2
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#define ILI251X_TOUCHES 10
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#define DEFAULT_POLL_PERIOD 20
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/* Touchscreen commands */
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@ -33,17 +35,25 @@ struct firmware_version {
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u8 minor;
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} __packed;
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enum ili2xxx_model {
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MODEL_ILI210X,
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MODEL_ILI251X,
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};
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struct ili210x {
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struct i2c_client *client;
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struct input_dev *input;
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unsigned int poll_period;
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struct delayed_work dwork;
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struct gpio_desc *reset_gpio;
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enum ili2xxx_model model;
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unsigned int max_touches;
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};
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static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
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size_t len)
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{
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struct ili210x *priv = i2c_get_clientdata(client);
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struct i2c_msg msg[2] = {
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{
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.addr = client->addr,
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@ -59,7 +69,38 @@ static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
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}
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};
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if (i2c_transfer(client->adapter, msg, 2) != 2) {
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if (priv->model == MODEL_ILI251X) {
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if (i2c_transfer(client->adapter, msg, 1) != 1) {
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dev_err(&client->dev, "i2c transfer failed\n");
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return -EIO;
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}
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usleep_range(5000, 5500);
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if (i2c_transfer(client->adapter, msg + 1, 1) != 1) {
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dev_err(&client->dev, "i2c transfer failed\n");
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return -EIO;
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}
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} else {
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if (i2c_transfer(client->adapter, msg, 2) != 2) {
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dev_err(&client->dev, "i2c transfer failed\n");
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return -EIO;
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}
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}
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return 0;
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}
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static int ili210x_read(struct i2c_client *client, void *buf, size_t len)
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{
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struct i2c_msg msg = {
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.addr = client->addr,
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.flags = I2C_M_RD,
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.len = len,
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.buf = buf,
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};
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if (i2c_transfer(client->adapter, &msg, 1) != 1) {
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dev_err(&client->dev, "i2c transfer failed\n");
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return -EIO;
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}
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@ -71,7 +112,7 @@ static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
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unsigned int finger,
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unsigned int *x, unsigned int *y)
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{
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if (finger >= MAX_TOUCHES)
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if (finger >= ILI210X_TOUCHES)
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return false;
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if (touchdata[0] & BIT(finger))
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@ -83,17 +124,43 @@ static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
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return true;
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}
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static bool ili251x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
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unsigned int finger,
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unsigned int *x, unsigned int *y)
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{
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if (finger >= ILI251X_TOUCHES)
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return false;
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*x = get_unaligned_be16(touchdata + 1 + (finger * 5) + 0);
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if (!(*x & BIT(15))) /* Touch indication */
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return false;
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*x &= 0x3fff;
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*y = get_unaligned_be16(touchdata + 1 + (finger * 5) + 2);
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return true;
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}
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static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
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{
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struct input_dev *input = priv->input;
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int i;
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bool touch;
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unsigned int x, y;
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bool contact = false, touch = false;
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unsigned int x = 0, y = 0;
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for (i = 0; i < MAX_TOUCHES; i++) {
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for (i = 0; i < priv->max_touches; i++) {
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input_mt_slot(input, i);
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touch = ili210x_touchdata_to_coords(priv, touchdata, i, &x, &y);
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if (priv->model == MODEL_ILI210X) {
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touch = ili210x_touchdata_to_coords(priv, touchdata,
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i, &x, &y);
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} else if (priv->model == MODEL_ILI251X) {
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touch = ili251x_touchdata_to_coords(priv, touchdata,
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i, &x, &y);
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if (touch)
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contact = true;
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}
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input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
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if (touch) {
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input_report_abs(input, ABS_MT_POSITION_X, x);
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@ -104,7 +171,10 @@ static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
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input_mt_report_pointer_emulation(input, false);
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input_sync(input);
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return touchdata[0] & 0xf3;
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if (priv->model == MODEL_ILI210X)
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contact = touchdata[0] & 0xf3;
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return contact;
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}
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static void ili210x_work(struct work_struct *work)
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@ -112,12 +182,20 @@ static void ili210x_work(struct work_struct *work)
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struct ili210x *priv = container_of(work, struct ili210x,
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dwork.work);
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struct i2c_client *client = priv->client;
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u8 touchdata[1 + 4 * MAX_TOUCHES];
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u8 touchdata[64] = { 0 };
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bool touch;
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int error;
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int error = -EINVAL;
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if (priv->model == MODEL_ILI210X) {
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error = ili210x_read_reg(client, REG_TOUCHDATA,
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touchdata, sizeof(touchdata));
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} else if (priv->model == MODEL_ILI251X) {
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error = ili210x_read_reg(client, REG_TOUCHDATA,
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touchdata, 31);
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if (!error && touchdata[0] == 2)
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error = ili210x_read(client, &touchdata[31], 20);
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}
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error = ili210x_read_reg(client, REG_TOUCHDATA,
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touchdata, sizeof(touchdata));
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if (error) {
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dev_err(&client->dev,
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"Unable to get touchdata, err = %d\n", error);
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@ -198,9 +276,12 @@ static int ili210x_i2c_probe(struct i2c_client *client,
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struct input_dev *input;
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struct panel_info panel;
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struct firmware_version firmware;
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enum ili2xxx_model model;
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int xmax, ymax;
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int error;
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model = (enum ili2xxx_model)id->driver_data;
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dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
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if (client->irq <= 0) {
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@ -236,6 +317,11 @@ static int ili210x_i2c_probe(struct i2c_client *client,
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priv->poll_period = DEFAULT_POLL_PERIOD;
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INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
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priv->reset_gpio = reset_gpio;
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priv->model = model;
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if (model == MODEL_ILI210X)
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priv->max_touches = ILI210X_TOUCHES;
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if (model == MODEL_ILI251X)
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priv->max_touches = ILI251X_TOUCHES;
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i2c_set_clientdata(client, priv);
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@ -274,7 +360,7 @@ static int ili210x_i2c_probe(struct i2c_client *client,
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input_set_abs_params(input, ABS_Y, 0, ymax, 0, 0);
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/* Multi touch */
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input_mt_init_slots(input, MAX_TOUCHES, 0);
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input_mt_init_slots(input, priv->max_touches, 0);
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input_set_abs_params(input, ABS_MT_POSITION_X, 0, xmax, 0, 0);
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input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ymax, 0, 0);
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@ -347,13 +433,15 @@ static SIMPLE_DEV_PM_OPS(ili210x_i2c_pm,
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ili210x_i2c_suspend, ili210x_i2c_resume);
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static const struct i2c_device_id ili210x_i2c_id[] = {
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{ "ili210x", 0 },
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{ "ili210x", MODEL_ILI210X },
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{ "ili251x", MODEL_ILI251X },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
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static const struct of_device_id ili210x_dt_ids[] = {
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{ .compatible = "ilitek,ili210x", },
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{ .compatible = "ilitek,ili210x", .data = (void *)MODEL_ILI210X },
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{ .compatible = "ilitek,ili251x", .data = (void *)MODEL_ILI251X },
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{ },
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};
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MODULE_DEVICE_TABLE(of, ili210x_dt_ids);
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