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authorLinus Torvalds <torvalds@linux-foundation.org>2016-08-06 03:24:15 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-06 03:24:15 (GMT)
commit39fada55274241d50e27eb961cc9280b5b6121fb (patch)
tree217ac8f085728251a45e2ac9bbcc6c79d4c53b8a /drivers/input/touchscreen
parentf72035fad84c9b51a45fd8afc8024f3df0ba8848 (diff)
parent22fe874f380336315dd0440dad475ff326784b22 (diff)
downloadlinux-39fada55274241d50e27eb961cc9280b5b6121fb.tar.xz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Pull more input updates from Dmitry Torokhov: "Two new drivers for touchscreen controllers: - Silead touchscreen controllers - SiS 9200 family touchscreen controllers and a few driver fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: silead - remove some dead code Input: sis-i2c - select CONFIG_CRC_ITU_T Input: add driver for SiS 9200 family I2C touchscreen controllers Input: ili210x - fix permissions on "calibrate" attribute Input: elan_i2c - properly wake up touchpad on ASUS laptops Input: add driver for Silead touchscreens Input: elantech - fix debug dump of the current packet Input: rotary_encoder - support binary encoding of states Input: xpad - power off wireless 360 controllers on suspend Input: i8042 - break load dependency between atkbd/psmouse and i8042 Input: synaptics-rmi4 - do not check for NULL when calling of_node_put() Input: cros_ec_keyb - cleanup use of dev
Diffstat (limited to 'drivers/input/touchscreen')
-rw-r--r--drivers/input/touchscreen/Kconfig25
-rw-r--r--drivers/input/touchscreen/Makefile2
-rw-r--r--drivers/input/touchscreen/ili210x.c2
-rw-r--r--drivers/input/touchscreen/silead.c565
-rw-r--r--drivers/input/touchscreen/sis_i2c.c413
5 files changed, 1006 insertions, 1 deletions
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index ee02dc7..2fb1f43 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -1059,6 +1059,31 @@ config TOUCHSCREEN_RM_TS
To compile this driver as a module, choose M here: the
module will be called raydium_i2c_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.
+
+config TOUCHSCREEN_SIS_I2C
+ tristate "SiS 9200 family I2C touchscreen"
+ depends on I2C
+ select CRC_ITU_T
+ depends on GPIOLIB || COMPILE_TEST
+ help
+ This enables support for SiS 9200 family over I2C based touchscreens.
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called sis_i2c.
+
config TOUCHSCREEN_ST1232
tristate "Sitronix ST1232 touchscreen controllers"
depends on I2C
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 3315882..b4373d6 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -64,6 +64,8 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
obj-$(CONFIG_TOUCHSCREEN_PIXCIR) += pixcir_i2c_ts.o
obj-$(CONFIG_TOUCHSCREEN_RM_TS) += raydium_i2c_ts.o
obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
+obj-$(CONFIG_TOUCHSCREEN_SILEAD) += silead.o
+obj-$(CONFIG_TOUCHSCREEN_SIS_I2C) += sis_i2c.o
obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o
obj-$(CONFIG_TOUCHSCREEN_SUN4I) += sun4i-ts.o
diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
index ddf694b..fe4848b 100644
--- a/drivers/input/touchscreen/ili210x.c
+++ b/drivers/input/touchscreen/ili210x.c
@@ -169,7 +169,7 @@ static ssize_t ili210x_calibrate(struct device *dev,
return count;
}
-static DEVICE_ATTR(calibrate, 0644, NULL, ili210x_calibrate);
+static DEVICE_ATTR(calibrate, S_IWUSR, NULL, ili210x_calibrate);
static struct attribute *ili210x_attributes[] = {
&dev_attr_calibrate.attr,
diff --git a/drivers/input/touchscreen/silead.c b/drivers/input/touchscreen/silead.c
new file mode 100644
index 0000000..7379fe1
--- /dev/null
+++ b/drivers/input/touchscreen/silead.c
@@ -0,0 +1,565 @@
+/* -------------------------------------------------------------------------
+ * 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/input/touchscreen.h>
+#include <linux/pm.h>
+#include <linux/irq.h>
+
+#include <asm/unaligned.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_Y_OFF 0x00
+#define SILEAD_POINT_Y_MSB_OFF 0x01
+#define SILEAD_POINT_X_OFF 0x02
+#define SILEAD_POINT_X_MSB_OFF 0x03
+#define SILEAD_TOUCH_ID_MASK 0xF0
+
+#define SILEAD_CMD_SLEEP_MIN 10000
+#define SILEAD_CMD_SLEEP_MAX 20000
+#define SILEAD_POWER_SLEEP 20
+#define SILEAD_STARTUP_SLEEP 30
+
+#define SILEAD_MAX_FINGERS 10
+
+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;
+ char fw_name[64];
+ struct touchscreen_properties prop;
+ u32 max_fingers;
+ u32 chip_id;
+ struct input_mt_pos pos[SILEAD_MAX_FINGERS];
+ int slots[SILEAD_MAX_FINGERS];
+ int id[SILEAD_MAX_FINGERS];
+};
+
+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 error;
+
+ data->input = devm_input_allocate_device(dev);
+ if (!data->input) {
+ dev_err(dev,
+ "Failed to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
+ input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
+ touchscreen_parse_properties(data->input, true, &data->prop);
+
+ input_mt_init_slots(data->input, data->max_fingers,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
+ INPUT_MT_TRACK);
+
+ data->input->name = SILEAD_TS_NAME;
+ data->input->phys = "input/ts";
+ data->input->id.bustype = BUS_I2C;
+
+ error = input_register_device(data->input);
+ if (error) {
+ dev_err(dev, "Failed to register input device: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static void silead_ts_set_power(struct i2c_client *client,
+ enum silead_ts_power state)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+
+ if (data->gpio_power) {
+ 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 input_dev *input = data->input;
+ struct device *dev = &client->dev;
+ u8 *bufp, buf[SILEAD_TS_DATA_LEN];
+ int touch_nr, error, i;
+
+ error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
+ SILEAD_TS_DATA_LEN, buf);
+ if (error < 0) {
+ dev_err(dev, "Data read error %d\n", error);
+ return;
+ }
+
+ touch_nr = buf[0];
+ if (touch_nr > data->max_fingers) {
+ dev_warn(dev, "More touches reported then supported %d > %d\n",
+ touch_nr, data->max_fingers);
+ touch_nr = data->max_fingers;
+ }
+
+ bufp = buf + SILEAD_POINT_DATA_LEN;
+ for (i = 0; i < touch_nr; i++, bufp += SILEAD_POINT_DATA_LEN) {
+ /* Bits 4-7 are the touch id */
+ data->id[i] = (bufp[SILEAD_POINT_X_MSB_OFF] &
+ SILEAD_TOUCH_ID_MASK) >> 4;
+ touchscreen_set_mt_pos(&data->pos[i], &data->prop,
+ get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
+ get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
+ }
+
+ input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
+
+ for (i = 0; i < touch_nr; i++) {
+ input_mt_slot(input, data->slots[i]);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
+ input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
+ input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
+
+ dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
+ data->pos[i].y, data->id[i], data->slots[i]);
+ }
+
+ input_mt_sync_frame(input);
+ input_sync(input);
+}
+
+static int silead_ts_init(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ int error;
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_RESET);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
+ data->max_fingers);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
+ SILEAD_CLOCK);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_START);
+ if (error)
+ 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", error);
+ return error;
+}
+
+static int silead_ts_reset(struct i2c_client *client)
+{
+ int error;
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
+ SILEAD_CMD_RESET);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
+ SILEAD_CLOCK);
+ if (error)
+ goto i2c_write_err;
+ usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
+ SILEAD_CMD_START);
+ if (error)
+ 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", error);
+ return error;
+}
+
+static int silead_ts_startup(struct i2c_client *client)
+{
+ int error;
+
+ error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
+ if (error) {
+ dev_err(&client->dev, "Startup error %d\n", error);
+ return error;
+ }
+
+ 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 error;
+
+ dev_dbg(dev, "Firmware file name: %s", data->fw_name);
+
+ error = request_firmware(&fw, data->fw_name, dev);
+ if (error) {
+ dev_err(dev, "Firmware request error %d\n", error);
+ return error;
+ }
+
+ fw_size = fw->size / sizeof(*fw_data);
+ fw_data = (struct silead_fw_data *)fw->data;
+
+ for (i = 0; i < fw_size; i++) {
+ error = i2c_smbus_write_i2c_block_data(client,
+ fw_data[i].offset,
+ 4,
+ (u8 *)&fw_data[i].val);
+ if (error) {
+ dev_err(dev, "Firmware load error %d\n", error);
+ break;
+ }
+ }
+
+ release_firmware(fw);
+ return error ?: 0;
+}
+
+static u32 silead_ts_get_status(struct i2c_client *client)
+{
+ int error;
+ __le32 status;
+
+ error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
+ sizeof(status), (u8 *)&status);
+ if (error < 0) {
+ dev_err(&client->dev, "Status read error %d\n", error);
+ return error;
+ }
+
+ return le32_to_cpu(status);
+}
+
+static int silead_ts_get_id(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ __le32 chip_id;
+ int error;
+
+ error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
+ sizeof(chip_id), (u8 *)&chip_id);
+ if (error < 0) {
+ dev_err(&client->dev, "Chip ID read error %d\n", error);
+ return error;
+ }
+
+ data->chip_id = le32_to_cpu(chip_id);
+ dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
+
+ return 0;
+}
+
+static int silead_ts_setup(struct i2c_client *client)
+{
+ int error;
+ u32 status;
+
+ silead_ts_set_power(client, SILEAD_POWER_OFF);
+ silead_ts_set_power(client, SILEAD_POWER_ON);
+
+ error = silead_ts_get_id(client);
+ if (error)
+ return error;
+
+ error = silead_ts_init(client);
+ if (error)
+ return error;
+
+ error = silead_ts_reset(client);
+ if (error)
+ return error;
+
+ error = silead_ts_load_fw(client);
+ if (error)
+ return error;
+
+ error = silead_ts_startup(client);
+ if (error)
+ return error;
+
+ status = silead_ts_get_status(client);
+ if (status != SILEAD_STATUS_OK) {
+ dev_err(&client->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 = id;
+ struct i2c_client *client = data->client;
+
+ silead_ts_read_data(client);
+
+ return IRQ_HANDLED;
+}
+
+static void silead_ts_read_props(struct i2c_client *client)
+{
+ struct silead_ts_data *data = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+ const char *str;
+ int error;
+
+ error = device_property_read_u32(dev, "silead,max-fingers",
+ &data->max_fingers);
+ if (error) {
+ dev_dbg(dev, "Max fingers read error %d\n", error);
+ data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
+ }
+
+ error = device_property_read_string(dev, "touchscreen-fw-name", &str);
+ if (!error)
+ snprintf(data->fw_name, sizeof(data->fw_name), "%s", str);
+ else
+ dev_dbg(dev, "Firmware file name read error. Using default.");
+}
+
+#ifdef CONFIG_ACPI
+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(dev->driver->acpi_match_table, dev);
+ if (!acpi_id)
+ return -ENODEV;
+
+ snprintf(data->fw_name, sizeof(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 {
+ snprintf(data->fw_name, sizeof(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)
+{
+ snprintf(data->fw_name, sizeof(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 error;
+
+ 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;
+
+ error = silead_ts_set_default_fw_name(data, id);
+ if (error)
+ return error;
+
+ silead_ts_read_props(client);
+
+ /* We must have the IRQ provided by DT or ACPI subsytem */
+ if (client->irq <= 0)
+ return -ENODEV;
+
+ /* Power GPIO pin */
+ data->gpio_power = gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
+ if (IS_ERR(data->gpio_power)) {
+ if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
+ dev_err(dev, "Shutdown GPIO request failed\n");
+ return PTR_ERR(data->gpio_power);
+ }
+
+ error = silead_ts_setup(client);
+ if (error)
+ return error;
+
+ error = silead_ts_request_input_dev(data);
+ if (error)
+ return error;
+
+ error = devm_request_threaded_irq(dev, client->irq,
+ NULL, silead_ts_threaded_irq_handler,
+ IRQF_ONESHOT, client->name, data);
+ if (error) {
+ if (error != -EPROBE_DEFER)
+ dev_err(dev, "IRQ request failed %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+static int __maybe_unused 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 __maybe_unused silead_ts_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int error, status;
+
+ silead_ts_set_power(client, SILEAD_POWER_ON);
+
+ error = silead_ts_reset(client);
+ if (error)
+ return error;
+
+ error = silead_ts_startup(client);
+ if (error)
+ return error;
+
+ status = silead_ts_get_status(client);
+ if (status != SILEAD_STATUS_OK) {
+ dev_err(dev, "Resume error, status: 0x%02x\n", status);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
+
+static const struct i2c_device_id silead_ts_id[] = {
+ { "gsl1680", 0 },
+ { "gsl1688", 0 },
+ { "gsl3670", 0 },
+ { "gsl3675", 0 },
+ { "gsl3692", 0 },
+ { "mssl1680", 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 },
+ { "MSSL1680", 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,
+ .acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
+ .pm = &silead_ts_pm,
+ },
+};
+module_i2c_driver(silead_ts_driver);
+
+MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
+MODULE_DESCRIPTION("Silead I2C touchscreen driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/input/touchscreen/sis_i2c.c b/drivers/input/touchscreen/sis_i2c.c
new file mode 100644
index 0000000..8d93f8c
--- /dev/null
+++ b/drivers/input/touchscreen/sis_i2c.c
@@ -0,0 +1,413 @@
+/*
+ * Touch Screen driver for SiS 9200 family I2C Touch panels
+ *
+ * Copyright (C) 2015 SiS, Inc.
+ * Copyright (C) 2016 Nextfour Group
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/crc-itu-t.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/interrupt.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <asm/unaligned.h>
+
+#define SIS_I2C_NAME "sis_i2c_ts"
+
+/*
+ * The I2C packet format:
+ * le16 byte count
+ * u8 Report ID
+ * <contact data - variable length>
+ * u8 Number of contacts
+ * le16 Scan Time (optional)
+ * le16 CRC
+ *
+ * One touch point information consists of 6+ bytes, the order is:
+ * u8 contact state
+ * u8 finger id
+ * le16 x axis
+ * le16 y axis
+ * u8 contact width (optional)
+ * u8 contact height (optional)
+ * u8 pressure (optional)
+ *
+ * Maximum amount of data transmitted in one shot is 64 bytes, if controller
+ * needs to report more contacts than fit in one packet it will send true
+ * number of contacts in first packet and 0 as number of contacts in second
+ * packet.
+ */
+
+#define SIS_MAX_PACKET_SIZE 64
+
+#define SIS_PKT_LEN_OFFSET 0
+#define SIS_PKT_REPORT_OFFSET 2 /* Report ID/type */
+#define SIS_PKT_CONTACT_OFFSET 3 /* First contact */
+
+#define SIS_SCAN_TIME_LEN 2
+
+/* Supported report types */
+#define SIS_ALL_IN_ONE_PACKAGE 0x10
+#define SIS_PKT_IS_TOUCH(x) (((x) & 0x0f) == 0x01)
+#define SIS_PKT_IS_HIDI2C(x) (((x) & 0x0f) == 0x06)
+
+/* Contact properties within report */
+#define SIS_PKT_HAS_AREA(x) ((x) & BIT(4))
+#define SIS_PKT_HAS_PRESSURE(x) ((x) & BIT(5))
+#define SIS_PKT_HAS_SCANTIME(x) ((x) & BIT(6))
+
+/* Contact size */
+#define SIS_BASE_LEN_PER_CONTACT 6
+#define SIS_AREA_LEN_PER_CONTACT 2
+#define SIS_PRESSURE_LEN_PER_CONTACT 1
+
+/* Offsets within contact data */
+#define SIS_CONTACT_STATUS_OFFSET 0
+#define SIS_CONTACT_ID_OFFSET 1 /* Contact ID */
+#define SIS_CONTACT_X_OFFSET 2
+#define SIS_CONTACT_Y_OFFSET 4
+#define SIS_CONTACT_WIDTH_OFFSET 6
+#define SIS_CONTACT_HEIGHT_OFFSET 7
+#define SIS_CONTACT_PRESSURE_OFFSET(id) (SIS_PKT_HAS_AREA(id) ? 8 : 6)
+
+/* Individual contact state */
+#define SIS_STATUS_UP 0x0
+#define SIS_STATUS_DOWN 0x3
+
+/* Touchscreen parameters */
+#define SIS_MAX_FINGERS 10
+#define SIS_MAX_X 4095
+#define SIS_MAX_Y 4095
+#define SIS_MAX_PRESSURE 255
+
+/* Resolution diagonal */
+#define SIS_AREA_LENGTH_LONGER 5792
+/*((SIS_MAX_X^2) + (SIS_MAX_Y^2))^0.5*/
+#define SIS_AREA_LENGTH_SHORT 5792
+#define SIS_AREA_UNIT (5792 / 32)
+
+struct sis_ts_data {
+ struct i2c_client *client;
+ struct input_dev *input;
+
+ struct gpio_desc *attn_gpio;
+ struct gpio_desc *reset_gpio;
+
+ u8 packet[SIS_MAX_PACKET_SIZE];
+};
+
+static int sis_read_packet(struct i2c_client *client, u8 *buf,
+ unsigned int *num_contacts,
+ unsigned int *contact_size)
+{
+ int count_idx;
+ int ret;
+ u16 len;
+ u16 crc, pkg_crc;
+ u8 report_id;
+
+ ret = i2c_master_recv(client, buf, SIS_MAX_PACKET_SIZE);
+ if (ret <= 0)
+ return -EIO;
+
+ len = get_unaligned_le16(&buf[SIS_PKT_LEN_OFFSET]);
+ if (len > SIS_MAX_PACKET_SIZE) {
+ dev_err(&client->dev,
+ "%s: invalid packet length (%d vs %d)\n",
+ __func__, len, SIS_MAX_PACKET_SIZE);
+ return -E2BIG;
+ }
+
+ if (len < 10)
+ return -EINVAL;
+
+ report_id = buf[SIS_PKT_REPORT_OFFSET];
+ count_idx = len - 1;
+ *contact_size = SIS_BASE_LEN_PER_CONTACT;
+
+ if (report_id != SIS_ALL_IN_ONE_PACKAGE) {
+ if (SIS_PKT_IS_TOUCH(report_id)) {
+ /*
+ * Calculate CRC ignoring packet length
+ * in the beginning and CRC transmitted
+ * at the end of the packet.
+ */
+ crc = crc_itu_t(0, buf + 2, len - 2 - 2);
+ pkg_crc = get_unaligned_le16(&buf[len - 2]);
+
+ if (crc != pkg_crc) {
+ dev_err(&client->dev,
+ "%s: CRC Error (%d vs %d)\n",
+ __func__, crc, pkg_crc);
+ return -EINVAL;
+ }
+
+ count_idx -= 2;
+
+ } else if (!SIS_PKT_IS_HIDI2C(report_id)) {
+ dev_err(&client->dev,
+ "%s: invalid packet ID %#02x\n",
+ __func__, report_id);
+ return -EINVAL;
+ }
+
+ if (SIS_PKT_HAS_SCANTIME(report_id))
+ count_idx -= SIS_SCAN_TIME_LEN;
+
+ if (SIS_PKT_HAS_AREA(report_id))
+ *contact_size += SIS_AREA_LEN_PER_CONTACT;
+ if (SIS_PKT_HAS_PRESSURE(report_id))
+ *contact_size += SIS_PRESSURE_LEN_PER_CONTACT;
+ }
+
+ *num_contacts = buf[count_idx];
+ return 0;
+}
+
+static int sis_ts_report_contact(struct sis_ts_data *ts, const u8 *data, u8 id)
+{
+ struct input_dev *input = ts->input;
+ int slot;
+ u8 status = data[SIS_CONTACT_STATUS_OFFSET];
+ u8 pressure;
+ u8 height, width;
+ u16 x, y;
+
+ if (status != SIS_STATUS_DOWN && status != SIS_STATUS_UP) {
+ dev_err(&ts->client->dev, "Unexpected touch status: %#02x\n",
+ data[SIS_CONTACT_STATUS_OFFSET]);
+ return -EINVAL;
+ }
+
+ slot = input_mt_get_slot_by_key(input, data[SIS_CONTACT_ID_OFFSET]);
+ if (slot < 0)
+ return -ENOENT;
+
+ input_mt_slot(input, slot);
+ input_mt_report_slot_state(input, MT_TOOL_FINGER,
+ status == SIS_STATUS_DOWN);
+
+ if (status == SIS_STATUS_DOWN) {
+ pressure = height = width = 1;
+ if (id != SIS_ALL_IN_ONE_PACKAGE) {
+ if (SIS_PKT_HAS_AREA(id)) {
+ width = data[SIS_CONTACT_WIDTH_OFFSET];
+ height = data[SIS_CONTACT_HEIGHT_OFFSET];
+ }
+
+ if (SIS_PKT_HAS_PRESSURE(id))
+ pressure =
+ data[SIS_CONTACT_PRESSURE_OFFSET(id)];
+ }
+
+ x = get_unaligned_le16(&data[SIS_CONTACT_X_OFFSET]);
+ y = get_unaligned_le16(&data[SIS_CONTACT_Y_OFFSET]);
+
+ input_report_abs(input, ABS_MT_TOUCH_MAJOR,
+ width * SIS_AREA_UNIT);
+ input_report_abs(input, ABS_MT_TOUCH_MINOR,
+ height * SIS_AREA_UNIT);
+ input_report_abs(input, ABS_MT_PRESSURE, pressure);
+ input_report_abs(input, ABS_MT_POSITION_X, x);
+ input_report_abs(input, ABS_MT_POSITION_Y, y);
+ }
+
+ return 0;
+}
+
+static void sis_ts_handle_packet(struct sis_ts_data *ts)
+{
+ const u8 *contact;
+ unsigned int num_to_report = 0;
+ unsigned int num_contacts;
+ unsigned int num_reported;
+ unsigned int contact_size;
+ int error;
+ u8 report_id;
+
+ do {
+ error = sis_read_packet(ts->client, ts->packet,
+ &num_contacts, &contact_size);
+ if (error)
+ break;
+
+ if (num_to_report == 0) {
+ num_to_report = num_contacts;
+ } else if (num_contacts != 0) {
+ dev_err(&ts->client->dev,
+ "%s: nonzero (%d) point count in tail packet\n",
+ __func__, num_contacts);
+ break;
+ }
+
+ report_id = ts->packet[SIS_PKT_REPORT_OFFSET];
+ contact = &ts->packet[SIS_PKT_CONTACT_OFFSET];
+ num_reported = 0;
+
+ while (num_to_report > 0) {
+ error = sis_ts_report_contact(ts, contact, report_id);
+ if (error)
+ break;
+
+ contact += contact_size;
+ num_to_report--;
+ num_reported++;
+
+ if (report_id != SIS_ALL_IN_ONE_PACKAGE &&
+ num_reported >= 5) {
+ /*
+ * The remainder of contacts is sent
+ * in the 2nd packet.
+ */
+ break;
+ }
+ }
+ } while (num_to_report > 0);
+
+ input_mt_sync_frame(ts->input);
+ input_sync(ts->input);
+}
+
+static irqreturn_t sis_ts_irq_handler(int irq, void *dev_id)
+{
+ struct sis_ts_data *ts = dev_id;
+
+ do {
+ sis_ts_handle_packet(ts);
+ } while (ts->attn_gpio && gpiod_get_value_cansleep(ts->attn_gpio));
+
+ return IRQ_HANDLED;
+}
+
+static void sis_ts_reset(struct sis_ts_data *ts)
+{
+ if (ts->reset_gpio) {
+ /* Get out of reset */
+ usleep_range(1000, 2000);
+ gpiod_set_value(ts->reset_gpio, 1);
+ usleep_range(1000, 2000);
+ gpiod_set_value(ts->reset_gpio, 0);
+ msleep(100);
+ }
+}
+
+static int sis_ts_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct sis_ts_data *ts;
+ struct input_dev *input;
+ int error;
+
+ ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->client = client;
+ i2c_set_clientdata(client, ts);
+
+ ts->attn_gpio = devm_gpiod_get_optional(&client->dev,
+ "attn", GPIOD_IN);
+ if (IS_ERR(ts->attn_gpio)) {
+ error = PTR_ERR(ts->attn_gpio);
+ if (error != -EPROBE_DEFER)
+ dev_err(&client->dev,
+ "Failed to get attention GPIO: %d\n", error);
+ return error;
+ }
+
+ ts->reset_gpio = devm_gpiod_get_optional(&client->dev,
+ "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(ts->reset_gpio)) {
+ error = PTR_ERR(ts->reset_gpio);
+ if (error != -EPROBE_DEFER)
+ dev_err(&client->dev,
+ "Failed to get reset GPIO: %d\n", error);
+ return error;
+ }
+
+ sis_ts_reset(ts);
+
+ ts->input = input = devm_input_allocate_device(&client->dev);
+ if (!input) {
+ dev_err(&client->dev, "Failed to allocate input device\n");
+ return -ENOMEM;
+ }
+
+ input->name = "SiS Touchscreen";
+ input->id.bustype = BUS_I2C;
+
+ input_set_abs_params(input, ABS_MT_POSITION_X, 0, SIS_MAX_X, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y, 0, SIS_MAX_Y, 0, 0);
+ input_set_abs_params(input, ABS_MT_PRESSURE, 0, SIS_MAX_PRESSURE, 0, 0);
+ input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
+ 0, SIS_AREA_LENGTH_LONGER, 0, 0);
+ input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
+ 0, SIS_AREA_LENGTH_SHORT, 0, 0);
+
+ error = input_mt_init_slots(input, SIS_MAX_FINGERS, INPUT_MT_DIRECT);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to initialize MT slots: %d\n", error);
+ return error;
+ }
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, sis_ts_irq_handler,
+ IRQF_ONESHOT,
+ client->name, ts);
+ if (error) {
+ dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
+ return error;
+ }
+
+ error = input_register_device(ts->input);
+ if (error) {
+ dev_err(&client->dev,
+ "Failed to register input device: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id sis_ts_dt_ids[] = {
+ { .compatible = "sis,9200-ts" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sis_ts_dt_ids);
+#endif
+
+static const struct i2c_device_id sis_ts_id[] = {
+ { SIS_I2C_NAME, 0 },
+ { "9200-ts", 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, sis_ts_id);
+
+static struct i2c_driver sis_ts_driver = {
+ .driver = {
+ .name = SIS_I2C_NAME,
+ .of_match_table = of_match_ptr(sis_ts_dt_ids),
+ },
+ .probe = sis_ts_probe,
+ .id_table = sis_ts_id,
+};
+module_i2c_driver(sis_ts_driver);
+
+MODULE_DESCRIPTION("SiS 9200 Family Touchscreen Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Mika Penttilä <mika.penttila@nextfour.com>");