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path: root/drivers/input/touchscreen/ili210x.c
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Diffstat (limited to 'drivers/input/touchscreen/ili210x.c')
-rw-r--r--drivers/input/touchscreen/ili210x.c520
1 files changed, 520 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
new file mode 100644
index 000000000..f437eefec
--- /dev/null
+++ b/drivers/input/touchscreen/ili210x.c
@@ -0,0 +1,520 @@
+// 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,
+ unsigned int *z);
+ bool (*continue_polling)(const u8 *data, bool touch);
+ unsigned int max_touches;
+ unsigned int resolution;
+ bool has_calibrate_reg;
+ bool has_pressure_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,
+ unsigned int *z)
+{
+ 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,
+ unsigned int *z)
+{
+ 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,
+ unsigned int *z)
+{
+ 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,
+ unsigned int *z)
+{
+ 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);
+ *z = touchdata[1 + (finger * 5) + 4];
+
+ 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,
+ .has_pressure_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, z = 0;
+
+ for (i = 0; i < priv->chip->max_touches; i++) {
+ touch = priv->chip->parse_touch_data(touchdata, i, &x, &y, &z);
+
+ 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);
+ if (priv->chip->has_pressure_reg)
+ input_report_abs(input, ABS_MT_PRESSURE, z);
+ 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(12000, 15000);
+ gpiod_set_value_cansleep(reset_gpio, 0);
+ msleep(160);
+ }
+
+ 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);
+ if (priv->chip->has_pressure_reg)
+ input_set_abs_params(input, ABS_MT_PRESSURE, 0, 0xa, 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");