Input: ili210x - add support for Ilitek ILI210x based touchscreens
The driver supports chipsets ILI2102, ILI2102s, ILI2103, ILI2103s and
ILI2105. Such kind of controllers can be found in Amazon Kindle Fire
devices.
Reviewed-by: Jan Paesmans <jan.paesmans@gmail.com>
Reviewed-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Olivier Sobrie <olivier@sobrie.be>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
new file mode 100644
index 0000000..c004417
--- /dev/null
+++ b/drivers/input/touchscreen/ili210x.c
@@ -0,0 +1,360 @@
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/delay.h>
+#include <linux/workqueue.h>
+#include <linux/input/ili210x.h>
+
+#define MAX_TOUCHES 2
+#define DEFAULT_POLL_PERIOD 20
+
+/* Touchscreen commands */
+#define REG_TOUCHDATA 0x10
+#define REG_PANEL_INFO 0x20
+#define REG_FIRMWARE_VERSION 0x40
+#define REG_CALIBRATE 0xcc
+
+struct finger {
+ u8 x_low;
+ u8 x_high;
+ u8 y_low;
+ u8 y_high;
+} __packed;
+
+struct touchdata {
+ u8 status;
+ struct finger finger[MAX_TOUCHES];
+} __packed;
+
+struct panel_info {
+ struct finger finger_max;
+ u8 xchannel_num;
+ u8 ychannel_num;
+} __packed;
+
+struct firmware_version {
+ u8 id;
+ u8 major;
+ u8 minor;
+} __packed;
+
+struct ili210x {
+ struct i2c_client *client;
+ struct input_dev *input;
+ bool (*get_pendown_state)(void);
+ unsigned int poll_period;
+ struct delayed_work dwork;
+};
+
+static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
+ size_t len)
+{
+ struct i2c_msg msg[2] = {
+ {
+ .addr = client->addr,
+ .flags = 0,
+ .len = 1,
+ .buf = ®,
+ },
+ {
+ .addr = client->addr,
+ .flags = I2C_M_RD,
+ .len = len,
+ .buf = buf,
+ }
+ };
+
+ if (i2c_transfer(client->adapter, msg, 2) != 2) {
+ dev_err(&client->dev, "i2c transfer failed\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static void ili210x_report_events(struct input_dev *input,
+ const struct touchdata *touchdata)
+{
+ int i;
+ bool touch;
+ unsigned int x, y;
+ const struct finger *finger;
+
+ for (i = 0; i < MAX_TOUCHES; i++) {
+ input_mt_slot(input, i);
+
+ finger = &touchdata->finger[i];
+
+ touch = touchdata->status & (1 << i);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
+ if (touch) {
+ x = finger->x_low | (finger->x_high << 8);
+ y = finger->y_low | (finger->y_high << 8);
+
+ input_report_abs(input, ABS_MT_POSITION_X, x);
+ input_report_abs(input, ABS_MT_POSITION_Y, y);
+ }
+ }
+
+ input_mt_report_pointer_emulation(input, false);
+ input_sync(input);
+}
+
+static bool get_pendown_state(const struct ili210x *priv)
+{
+ bool state = false;
+
+ if (priv->get_pendown_state)
+ state = priv->get_pendown_state();
+
+ return state;
+}
+
+static void ili210x_work(struct work_struct *work)
+{
+ struct ili210x *priv = container_of(work, struct ili210x,
+ dwork.work);
+ struct i2c_client *client = priv->client;
+ struct touchdata touchdata;
+ int error;
+
+ error = ili210x_read_reg(client, REG_TOUCHDATA,
+ &touchdata, sizeof(touchdata));
+ if (error) {
+ dev_err(&client->dev,
+ "Unable to get touchdata, err = %d\n", error);
+ return;
+ }
+
+ ili210x_report_events(priv->input, &touchdata);
+
+ if ((touchdata.status & 0xf3) || get_pendown_state(priv))
+ schedule_delayed_work(&priv->dwork,
+ msecs_to_jiffies(priv->poll_period));
+}
+
+static irqreturn_t ili210x_irq(int irq, void *irq_data)
+{
+ struct ili210x *priv = irq_data;
+
+ schedule_delayed_work(&priv->dwork, 0);
+
+ 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, 0644, NULL, ili210x_calibrate);
+
+static struct attribute *ili210x_attributes[] = {
+ &dev_attr_calibrate.attr,
+ NULL,
+};
+
+static const struct attribute_group ili210x_attr_group = {
+ .attrs = ili210x_attributes,
+};
+
+static int __devinit ili210x_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ const struct ili210x_platform_data *pdata = dev->platform_data;
+ struct ili210x *priv;
+ struct input_dev *input;
+ struct panel_info panel;
+ struct firmware_version firmware;
+ int xmax, ymax;
+ int error;
+
+ dev_dbg(dev, "Probing for ILI210X I2C Touschreen driver");
+
+ if (!pdata) {
+ dev_err(dev, "No platform data!\n");
+ return -EINVAL;
+ }
+
+ if (client->irq <= 0) {
+ dev_err(dev, "No IRQ!\n");
+ return -EINVAL;
+ }
+
+ /* Get firmware version */
+ error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,
+ &firmware, sizeof(firmware));
+ if (error) {
+ dev_err(dev, "Failed to get firmware version, err: %d\n",
+ error);
+ return error;
+ }
+
+ /* get panel info */
+ error = ili210x_read_reg(client, REG_PANEL_INFO, &panel, sizeof(panel));
+ if (error) {
+ dev_err(dev, "Failed to get panel informations, err: %d\n",
+ error);
+ return error;
+ }
+
+ xmax = panel.finger_max.x_low | (panel.finger_max.x_high << 8);
+ ymax = panel.finger_max.y_low | (panel.finger_max.y_high << 8);
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ input = input_allocate_device();
+ if (!priv || !input) {
+ error = -ENOMEM;
+ goto err_free_mem;
+ }
+
+ priv->client = client;
+ priv->input = input;
+ priv->get_pendown_state = pdata->get_pendown_state;
+ priv->poll_period = pdata->poll_period ? : DEFAULT_POLL_PERIOD;
+ INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
+
+ /* Setup input device */
+ input->name = "ILI210x Touchscreen";
+ input->id.bustype = BUS_I2C;
+ input->dev.parent = dev;
+
+ __set_bit(EV_SYN, input->evbit);
+ __set_bit(EV_KEY, input->evbit);
+ __set_bit(EV_ABS, input->evbit);
+ __set_bit(BTN_TOUCH, input->keybit);
+
+ /* Single touch */
+ input_set_abs_params(input, ABS_X, 0, xmax, 0, 0);
+ input_set_abs_params(input, ABS_Y, 0, ymax, 0, 0);
+
+ /* Multi touch */
+ input_mt_init_slots(input, MAX_TOUCHES);
+ 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);
+
+ input_set_drvdata(input, priv);
+ i2c_set_clientdata(client, priv);
+
+ error = request_irq(client->irq, ili210x_irq, pdata->irq_flags,
+ client->name, priv);
+ if (error) {
+ dev_err(dev, "Unable to request touchscreen IRQ, err: %d\n",
+ error);
+ goto err_free_mem;
+ }
+
+ error = sysfs_create_group(&dev->kobj, &ili210x_attr_group);
+ if (error) {
+ dev_err(dev, "Unable to create sysfs attributes, err: %d\n",
+ error);
+ goto err_free_irq;
+ }
+
+ error = input_register_device(priv->input);
+ if (error) {
+ dev_err(dev, "Cannot regiser input device, err: %d\n", error);
+ goto err_remove_sysfs;
+ }
+
+ device_init_wakeup(&client->dev, 1);
+
+ dev_dbg(dev,
+ "ILI210x initialized (IRQ: %d), firmware version %d.%d.%d",
+ client->irq, firmware.id, firmware.major, firmware.minor);
+
+ return 0;
+
+err_remove_sysfs:
+ sysfs_remove_group(&dev->kobj, &ili210x_attr_group);
+err_free_irq:
+ free_irq(client->irq, priv);
+err_free_mem:
+ input_free_device(input);
+ kfree(priv);
+ return error;
+}
+
+static int __devexit ili210x_i2c_remove(struct i2c_client *client)
+{
+ struct ili210x *priv = i2c_get_clientdata(client);
+
+ sysfs_remove_group(&client->dev.kobj, &ili210x_attr_group);
+ free_irq(priv->client->irq, priv);
+ cancel_delayed_work_sync(&priv->dwork);
+ input_unregister_device(priv->input);
+ kfree(priv);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int ili210x_i2c_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (device_may_wakeup(&client->dev))
+ enable_irq_wake(client->irq);
+
+ return 0;
+}
+
+static int ili210x_i2c_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ if (device_may_wakeup(&client->dev))
+ disable_irq_wake(client->irq);
+
+ return 0;
+}
+#endif
+
+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 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ili210x_i2c_id);
+
+static struct i2c_driver ili210x_ts_driver = {
+ .driver = {
+ .name = "ili210x_i2c",
+ .owner = THIS_MODULE,
+ .pm = &ili210x_i2c_pm,
+ },
+ .id_table = ili210x_i2c_id,
+ .probe = ili210x_i2c_probe,
+ .remove = __devexit_p(ili210x_i2c_remove),
+};
+
+module_i2c_driver(ili210x_ts_driver);
+
+MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
+MODULE_DESCRIPTION("ILI210X I2C Touchscreen Driver");
+MODULE_LICENSE("GPL");