This driver adds support for Silead touchscreens. It has been tested
with GSL1680 and GSL3680 touch panels.
It supports ACPI and device tree enumeration. For ACPI you need ACPI 5.1+
in order to be able to use named GPIOs. In device tree you can use 'interrupts'
or a named GPIO for IRQ.
Screen resolution, the maximum number of fingers supported and firmware name
are configurable using ACPI/DT properties.
Signed-off-by: Robert Dolca <robert.dolca@xxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 12 +
drivers/input/touchscreen/Makefile | 1 +
drivers/input/touchscreen/silead.c | 596 +++++++++++++++++++++++++++++++++++++
3 files changed, 609 insertions(+)
create mode 100644 drivers/input/touchscreen/silead.c
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 547f67d65..dd12f36 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1025,4 +1025,16 @@ config TOUCHSCREEN_ZFORCE
To compile this driver as a module, choose M here: the
module will be called zforce_ts.
+config TOUCHSCREEN_SILEAD
+ tristate "Silead I2C touchscreen"
+ depends on I2C
+ help
+ Say Y here if you have the Silead touchscreen connected to
+ your system.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called silead.
+
endif
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 44deea7..2c6beaa 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -84,3 +84,4 @@ obj-$(CONFIG_TOUCHSCREEN_W90X900) += w90p910_ts.o
obj-$(CONFIG_TOUCHSCREEN_SX8654) += sx8654.o
obj-$(CONFIG_TOUCHSCREEN_TPS6507X) += tps6507x-ts.o
obj-$(CONFIG_TOUCHSCREEN_ZFORCE) += zforce_ts.o
+obj-$(CONFIG_TOUCHSCREEN_SILEAD) += silead.o
diff --git a/drivers/input/touchscreen/silead.c b/drivers/input/touchscreen/silead.c
new file mode 100644
index 0000000..b7da344
--- /dev/null
+++ b/drivers/input/touchscreen/silead.c
@@ -0,0 +1,596 @@
+/* -------------------------------------------------------------------------
+ * Copyright (C) 2014-2015, Intel Corporation
+ *
+ * Derived from:
+ * gslX68X.c
+ * Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ * ------------------------------------------------------------------------- */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <linux/interrupt.h>
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/pm.h>
+#include <linux/irq.h>
+
+#define SILEAD_TS_NAME "silead_ts"
+
+#define SILEAD_REG_RESET 0xE0
+#define SILEAD_REG_DATA 0x80
+#define SILEAD_REG_TOUCH_NR 0x80
+#define SILEAD_REG_POWER 0xBC
+#define SILEAD_REG_CLOCK 0xE4
+#define SILEAD_REG_STATUS 0xB0
+#define SILEAD_REG_ID 0xFC
+#define SILEAD_REG_MEM_CHECK 0xB0
+
+#define SILEAD_STATUS_OK 0x5A5A5A5A
+#define SILEAD_TS_DATA_LEN 44
+#define SILEAD_CLOCK 0x04
+
+#define SILEAD_CMD_RESET 0x88
+#define SILEAD_CMD_START 0x00
+
+#define SILEAD_POINT_DATA_LEN 0x04
+#define SILEAD_POINT_X_OFF 0x02
+#define SILEAD_POINT_ID_OFF 0x03
+#define SILEAD_X_HSB_MASK 0xF0
+#define SILEAD_TOUCH_ID_MASK 0x0F
+
+#define SILEAD_DP_X_MAX "resolution-x"
+#define SILEAD_DP_Y_MAX "resolution-y"
+#define SILEAD_DP_MAX_FINGERS "max-fingers"
+#define SILEAD_DP_FW_NAME "fw-name"
+#define SILEAD_PWR_GPIO_NAME "power"
+
+#define SILEAD_CMD_SLEEP_MIN 10000
+#define SILEAD_CMD_SLEEP_MAX 20000
+#define SILEAD_POWER_SLEEP 20
+#define SILEAD_STARTUP_SLEEP 30
+
+enum silead_ts_power {
+ SILEAD_POWER_ON = 1,
+ SILEAD_POWER_OFF = 0
+};
+
+struct silead_ts_data {
+ struct i2c_client *client;
+ struct gpio_desc *gpio_power;
+ struct input_dev *input;
+ const char *custom_fw_name;
+ char fw_name[I2C_NAME_SIZE];
+ u16 x_max;
+ u16 y_max;
+ u8 max_fingers;
+ u32 chip_id;
+};
+
+struct silead_fw_data {
+ u32 offset;
+ u32 val;
+};
+
+static int silead_ts_request_input_dev(struct silead_ts_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+
+ data->input = devm_input_allocate_device(dev);
+ if (!data->input) {
+ dev_err(dev,
+ "Failed to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ input_set_capability(data->input, EV_ABS, ABS_X);
+ input_set_capability(data->input, EV_ABS, ABS_Y);
+
+ input_set_abs_params(data->input, ABS_MT_POSITION_X, 0,
+ data->x_max, 0, 0);
+ input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0,
+ data->y_max, 0, 0);
+
+ input_mt_init_slots(data->input, data->max_fingers,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+
+ data->input->name = SILEAD_TS_NAME;
+ data->input->phys = "input/ts";
+ data->input->id.bustype = BUS_I2C;
+
+ ret = input_register_device(data->input);
+ if (ret) {
+ dev_err(dev, "Failed to register input device: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void silead_ts_report_touch(struct silead_ts_data *data, u16 x, u16 y,
+ u8 id)
+{
+ input_mt_slot(data->input, id);
+ input_mt_report_slot_state(data->input, MT_TOOL_FINGER, true);
+ input_report_abs(data->input, ABS_MT_POSITION_X, x);
+ input_report_abs(data->input, ABS_MT_POSITION_Y, y);
+}
+
+static void silead_ts_set_power(struct i2c_client *client,
+ enum silead_ts_power state)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+
+ gpiod_set_value_cansleep(data->gpio_power, state);
+ msleep(SILEAD_POWER_SLEEP);
+}
+
+static void silead_ts_read_data(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+ u8 buf[SILEAD_TS_DATA_LEN];
+ int x, y, id, touch_nr, ret, i, offset;
+
+ ret = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
+ SILEAD_TS_DATA_LEN, buf);
+ if (ret < 0) {
+ dev_err(dev, "Data read error %d\n", ret);
+ return;
+ }
+
+ touch_nr = buf[0];
+
+ if (touch_nr < 0)
+ return;
+
+ dev_dbg(dev, "Touch number: %d\n", touch_nr);
+
+ for (i = 1; i <= touch_nr; i++) {
+ offset = i * SILEAD_POINT_DATA_LEN;
+
+ /* The last 4 bits are the touch id */
+ id = buf[offset + SILEAD_POINT_ID_OFF] & SILEAD_TOUCH_ID_MASK;
+
+ /* The 1st 4 bits are part of X */
+ buf[offset + SILEAD_POINT_ID_OFF] =
+ (buf[offset + SILEAD_POINT_ID_OFF] & SILEAD_X_HSB_MASK)
+ >> 4;
+
+ y = le16_to_cpup((__le16 *)(buf + offset));
+ x = le16_to_cpup((__le16 *)(buf + offset + SILEAD_POINT_X_OFF));
+
+ dev_dbg(dev, "x=%d y=%d id=%d\n", x, y, id);
+ silead_ts_report_touch(data, x, y, id);
+ }
+
+ input_mt_sync_frame(data->input);
+ input_sync(data->input);
+}
+
+static int silead_ts_init(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_RESET);
+ if (ret)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ ret = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
+ data->max_fingers);
+ if (ret)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ ret = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, SILEAD_CLOCK);
+ if (ret)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ ret = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_START);
+ if (ret)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ return 0;
+
+i2c_write_err:
+ dev_err(&client->dev, "Registers clear error %d\n", ret);
+ return ret;
+}
+
+static int silead_ts_reset(struct i2c_client *client)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_RESET);
+ if (ret)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ ret = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, SILEAD_CLOCK);
+ if (ret)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ ret = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
+ SILEAD_CMD_START);
+ if (ret)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ return 0;
+
+i2c_write_err:
+ dev_err(&client->dev, "Chip reset error %d\n", ret);
+ return ret;
+}
+
+static int silead_ts_startup(struct i2c_client *client)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
+ if (ret) {
+ dev_err(&client->dev, "Startup error %d\n", ret);
+ return ret;
+ }
+ msleep(SILEAD_STARTUP_SLEEP);
+
+ return 0;
+}
+
+static int silead_ts_load_fw(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ unsigned int fw_size, i;
+ const struct firmware *fw;
+ struct silead_fw_data *fw_data;
+ int ret;
+
+ dev_dbg(dev, "Firmware file name: %s", data->fw_name);
+
+ if (data->custom_fw_name)
+ ret = request_firmware(&fw, data->custom_fw_name, dev);
+ else
+ ret = request_firmware(&fw, data->fw_name, dev);
+
+ if (ret) {
+ dev_err(dev, "Firmware request error %d\n", ret);
+ return ret;
+ }
+
+ fw_size = fw->size / sizeof(*fw_data);
+ fw_data = (struct silead_fw_data *)fw->data;
+
+ for (i = 0; i < fw_size; i++) {
+ ret = i2c_smbus_write_i2c_block_data(client, fw_data[i].offset,
+ 4, (u8 *)&fw_data[i].val);
+ if (ret) {
+ dev_err(dev, "Firmware load error %d\n", ret);
+ goto release_fw_err;
+ }
+ }
+
+ release_firmware(fw);
+ return 0;
+
+release_fw_err:
+ release_firmware(fw);
+ return ret;
+}
+
+static u32 silead_ts_get_status(struct i2c_client *client)
+{
+ int ret;
+ u32 status;
+
+ ret = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS, 4,
+ (u8 *)&status);
+ if (ret < 0) {
+ dev_err(&client->dev, "Status read error %d\n", ret);
+ return ret;
+ }
+
+ return status;
+}
+
+static int silead_ts_get_id(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID, 4,
+ (u8 *)&data->chip_id);
+ if (ret < 0) {
+ dev_err(&client->dev, "Chip ID read error %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int silead_ts_setup(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+ int ret;
+ u32 status;
+
+ silead_ts_set_power(client, SILEAD_POWER_OFF);
+ silead_ts_set_power(client, SILEAD_POWER_ON);
+
+ ret = silead_ts_get_id(client);
+ if (ret)
+ return ret;
+ dev_dbg(dev, "Chip ID: 0x%8X", data->chip_id);
+
+ ret = silead_ts_init(client);
+ if (ret)
+ return ret;
+
+ ret = silead_ts_reset(client);
+ if (ret)
+ return ret;
+
+ ret = silead_ts_load_fw(client);
+ if (ret)
+ return ret;
+
+ ret = silead_ts_startup(client);
+ if (ret)
+ return ret;
+
+ status = silead_ts_get_status(client);
+ if (status != SILEAD_STATUS_OK) {
+ dev_err(dev, "Initialization error, status: 0x%X\n", status);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
+{
+ struct silead_ts_data *data = (struct silead_ts_data *)id;
+ struct i2c_client *client = data->client;
+
+ silead_ts_read_data(client);
+
+ return IRQ_HANDLED;
+}
+
+static int silead_ts_read_props(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+ int ret;
+
+ ret = device_property_read_u16(dev, SILEAD_DP_X_MAX, &data->x_max);
+ if (ret) {
+ dev_err(dev, "Resolution X read error %d\n", ret);
+ goto error;
+ }
+
+ ret = device_property_read_u16(dev, SILEAD_DP_Y_MAX, &data->y_max);
+ if (ret) {
+ dev_err(dev, "Resolution Y read error %d\n", ret);
+ goto error;
+ }
+
+ ret = device_property_read_u8(dev, SILEAD_DP_MAX_FINGERS,
+ &data->max_fingers);
+ if (ret) {
+ dev_err(dev, "Max fingers read error %d\n", ret);
+ goto error;
+ }
+
+ ret = device_property_read_string(dev, SILEAD_DP_FW_NAME,
+ &data->custom_fw_name);
+ if (ret)
+ dev_info(dev, "Firmware file name read error. Using default.");
+
+ dev_dbg(dev, "X max = %d, Y max = %d, max fingers = %d",
+ data->x_max, data->y_max, data->max_fingers);
+
+ return 0;
+
+error:
+ return ret;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id silead_ts_acpi_match[];
+
+static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
+ const struct i2c_device_id *id)
+{
+ const struct acpi_device_id *acpi_id;
+ struct device *dev = &data->client->dev;
+ int i;
+
+ if (ACPI_HANDLE(dev)) {
+ acpi_id = acpi_match_device(silead_ts_acpi_match, dev);
+ if (!acpi_id)
+ return -ENODEV;
+
+ sprintf(data->fw_name, "%s.fw", acpi_id->id);
+
+ for (i = 0; i < strlen(data->fw_name); i++)
+ data->fw_name[i] = tolower(data->fw_name[i]);
+ } else {
+ sprintf(data->fw_name, "%s.fw", id->name);
+ }
+
+ return 0;
+}
+#else
+static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
+ const struct i2c_device_id *id)
+{
+ sprintf(data->fw_name, "%s.fw", id->name);
+ return 0;
+}
+#endif
+
+static int silead_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct silead_ts_data *data;
+ struct device *dev = &client->dev;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_I2C |
+ I2C_FUNC_SMBUS_READ_I2C_BLOCK |
+ I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
+ dev_err(dev, "I2C functionality check failed\n");
+ return -ENXIO;
+ }
+
+ data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, data);
+ data->client = client;
+
+ ret = silead_ts_set_default_fw_name(data, id);
+ if (ret)
+ return ret;
+
+ /* If the IRQ is not filled by DT or ACPI subsytem
+ * we can't continue without it */
+ if (client->irq <= 0)
+ return -ENODEV;
+
+ /* Power GPIO pin */
+ data->gpio_power = devm_gpiod_get(dev, SILEAD_PWR_GPIO_NAME,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(data->gpio_power)) {
+ dev_err(dev, "Shutdown GPIO request failed\n");
+ return PTR_ERR(data->gpio_power);
+ }
+
+ ret = silead_ts_read_props(client);
+ if (ret)
+ return ret;
+
+ ret = silead_ts_setup(client);
+ if (ret)
+ return ret;
+
+ ret = silead_ts_request_input_dev(data);
+ if (ret)
+ return ret;
+
+ ret = devm_request_threaded_irq(dev, client->irq, NULL,
+ silead_ts_threaded_irq_handler,
+ IRQF_ONESHOT | IRQ_TYPE_EDGE_RISING,
+ client->name, data);
+ if (ret) {
+ dev_err(dev, "IRQ request failed %d\n", ret);
+ return ret;
+ }
+
+ dev_dbg(dev, "Probing succeded\n");
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int silead_ts_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+
+ silead_ts_set_power(client, SILEAD_POWER_OFF);
+ return 0;
+}
+
+static int silead_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret, status;
+
+ silead_ts_set_power(client, SILEAD_POWER_ON);
+
+ ret = silead_ts_reset(client);
+ if (ret)
+ return ret;
+
+ ret = silead_ts_startup(client);
+ if (ret)
+ return ret;
+
+ status = silead_ts_get_status(client);
+ if (status != SILEAD_STATUS_OK) {
+ dev_err(dev, "Resume error, status: 0x%X\n", status);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
+#endif
+
+static const struct i2c_device_id silead_ts_id[] = {
+ { "gsl1680", 0 },
+ { "gsl1688", 0 },
+ { "gsl3670", 0 },
+ { "gsl3675", 0 },
+ { "gsl3692", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, silead_ts_id);
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id silead_ts_acpi_match[] = {
+ { "GSL1680", 0 },
+ { "GSL1688", 0 },
+ { "GSL3670", 0 },
+ { "GSL3675", 0 },
+ { "GSL3692", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
+#endif
+
+static struct i2c_driver silead_ts_driver = {
+ .probe = silead_ts_probe,
+ .id_table = silead_ts_id,
+ .driver = {
+ .name = SILEAD_TS_NAME,
+ .owner = THIS_MODULE,
+#ifdef CONFIG_ACPI
+ .acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
+#endif
+#ifdef CONFIG_PM_SLEEP
+ .pm = &silead_ts_pm,
+#endif
+ },
+};
+module_i2c_driver(silead_ts_driver);
+
+MODULE_AUTHOR("Robert Dolca <robert.dolca@xxxxxxxxx>");
+MODULE_DESCRIPTION("Silead I2C touchscreen driver");
+MODULE_LICENSE("GPL");
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
