diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/input/touchscreen/ili210x.c | 520 |
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 = ®, + }, + { + .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, ®, 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"); |