| Message ID | 1449473161-3535-3-git-send-email-plaes@plaes.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hey Priit, On Mon, 2015-12-07 at 09:26 +0200, Priit Laes wrote: > This patch adds Goodix GT801 2+1 touchscreen controller support. > > GT801 2+1 is a 10-finger touch controller consisting of > ARM controller interfacing two GT801 5-finger controllers. This would implement support for the "Guitar" protocol used by a few more variants of the GT80x devices. Can you rename the driver/docs to that effect? <snip> > + > +static const struct i2c_device_id gt801x_ts_id[] = { > + { "GDIX1001:00", 0 }, This clashes with the ID used in the goodix.c driver. Cheers
On Mon, Dec 07, 2015 at 09:26:01AM +0200, Priit Laes wrote: > This patch adds Goodix GT801 2+1 touchscreen controller support. > > GT801 2+1 is a 10-finger touch controller consisting of > ARM controller interfacing two GT801 5-finger controllers. > > Signed-off-by: Priit Laes <plaes@plaes.org> > --- > .../bindings/input/touchscreen/gt801_2plus1.txt | 23 ++ For the binding: Acked-by: Rob Herring <robh@kernel.org> > MAINTAINERS | 6 + > drivers/input/touchscreen/Kconfig | 19 +- > drivers/input/touchscreen/Makefile | 1 + > drivers/input/touchscreen/gt801_2plus1.c | 375 +++++++++++++++++++++ > 5 files changed, 421 insertions(+), 3 deletions(-) > create mode 100644 Documentation/devicetree/bindings/input/touchscreen/gt801_2plus1.txt > create mode 100644 drivers/input/touchscreen/gt801_2plus1.c > > diff --git a/Documentation/devicetree/bindings/input/touchscreen/gt801_2plus1.txt b/Documentation/devicetree/bindings/input/touchscreen/gt801_2plus1.txt > new file mode 100644 > index 0000000..070ff5b > --- /dev/null > +++ b/Documentation/devicetree/bindings/input/touchscreen/gt801_2plus1.txt > @@ -0,0 +1,23 @@ > +Device tree bindings for Goodix GT801 2+1 series touchscreen controller > + > +Required properties: > + > + - compatible : Should be "goodix,gt801_2plus1" > + - reg : I2C address of the chip. Should be 0x55 > + - interrupt-parent : Interrupt controller to which the chip is connected > + - interrupts : Interrupt to which the chip is connected > + > +Example: > + > + i2c@00000000 { > + /* ... */ > + > + touchscreen@55 { > + compatible = "goodix,gt801_2plus1"; > + reg = <0x55>; > + interrupt-parent = <&gpio>; > + interrupts = <0 0>; > + }; > + > + /* ... */ > + }; > diff --git a/MAINTAINERS b/MAINTAINERS > index cba790b..e292126 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -4743,6 +4743,12 @@ L: linux-input@vger.kernel.org > S: Maintained > F: drivers/input/touchscreen/goodix.c > > +GOODIX GT801 2PLUS1 TOUCHSCREEN > +M: Priit Laes <plaes@plaes.org> > +L: linux-input@vger.kernel.org > +S: Maintained > +F: drivers/input/touchscreen/gt801_2plus1.c > + > GPIO SUBSYSTEM > M: Linus Walleij <linus.walleij@linaro.org> > M: Alexandre Courbot <gnurou@gmail.com> > diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig > index ae33da7..c7c3324 100644 > --- a/drivers/input/touchscreen/Kconfig > +++ b/drivers/input/touchscreen/Kconfig > @@ -322,11 +322,11 @@ config TOUCHSCREEN_FUJITSU > module will be called fujitsu-ts. > > config TOUCHSCREEN_GOODIX > - tristate "Goodix I2C touchscreen" > + tristate "Goodix GT9xx I2C touchscreen" > depends on I2C > help > - Say Y here if you have the Goodix touchscreen (such as one > - installed in Onda v975w tablets) connected to your > + Say Y here if you have one of the Goodix GT9xx touchscreens > + (such as one installed in Onda v975w tablet) connected to your > system. It also supports 5-finger chip models, which can be > found on ARM tablets, like Wexler TAB7200 and MSI Primo73. > > @@ -335,6 +335,19 @@ config TOUCHSCREEN_GOODIX > To compile this driver as a module, choose M here: the > module will be called goodix. > > +config TOUCHSCREEN_GT801_2PLUS1 > + tristate "Goodix GT801 2+1 I2C touchscreen" > + depends on I2C > + help > + Say Y here if you have the Goodix GT801 2+1 touchscreen. > + This controller is found on some older ARM tablets like > + (Gemei G9 and Zareason Zatab). > + > + If unsure, say N. > + > + To compile this driver as a module, choose M here: the > + module will be called gt801_2plus1. > + > config TOUCHSCREEN_ILI210X > tristate "Ilitek ILI210X based touchscreen" > depends on I2C > diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile > index cbaa6ab..ff25d1b4 100644 > --- a/drivers/input/touchscreen/Makefile > +++ b/drivers/input/touchscreen/Makefile > @@ -38,6 +38,7 @@ obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o > obj-$(CONFIG_TOUCHSCREEN_FT6236) += ft6236.o > obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o > obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o > +obj-$(CONFIG_TOUCHSCREEN_GT801_2PLUS1) += gt801_2plus1.o > obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o > obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC) += imx6ul_tsc.o > obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o > diff --git a/drivers/input/touchscreen/gt801_2plus1.c b/drivers/input/touchscreen/gt801_2plus1.c > new file mode 100644 > index 0000000..e2be479 > --- /dev/null > +++ b/drivers/input/touchscreen/gt801_2plus1.c > @@ -0,0 +1,375 @@ > +/* > + * Driver for Goodix GT801 2+1 ARM touchscreen controllers > + * > + * Copyright (c) 2015 Priit Laes <plaes@plaes.org>. > + * > + * This code is based on goodix.c driver (c) 2014 Red Hat Inc, > + * various Android codedumps (c) 2010 - 2012 Goodix Technology > + * and cleanups done by Emilio López (turl) for linux-sunxi. > + * > + * 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; version 2 of the License. > + */ > +#include <asm/unaligned.h> > +#include <linux/delay.h> > +#include <linux/i2c.h> > +#include <linux/irq.h> > +#include <linux/module.h> > +#include <linux/interrupt.h> > +#include <linux/input/mt.h> > + > +struct gt801x_ts_data { > + struct i2c_client *client; > + struct input_dev *input_dev; > + int abs_x_max; > + int abs_y_max; > + unsigned int max_touch_num; > + unsigned int int_trigger_type; > +}; > + > +#define GOODIX_MAX_HEIGHT 4096 > +#define GOODIX_MAX_WIDTH 4096 > +#define GOODIX_INT_TRIGGER 1 > +#define GOODIX_MAX_CONTACTS 10 > +#define MAX_CONTACTS_LOC 5 > +#define RESOLUTION_LOC 1 > +#define TRIGGER_LOC 6 > + > +/* Register defines */ > +#define GT801X_COOR_ADDR 0x01 > +#define GT801X_CONFIG_DATA 0x65 > +#define GT801X_REG_ID 0xf0 > + > +/* Device specific defines */ > +#define GT801X_CONFIG_MAX_LENGTH 7 > +#define GT801X_CONTACT_SIZE 5 > + > +static const unsigned long goodix_irq_flags[] = { > + IRQ_TYPE_EDGE_RISING, > + IRQ_TYPE_EDGE_FALLING, > + IRQ_TYPE_LEVEL_LOW, > + IRQ_TYPE_LEVEL_HIGH, > +}; > + > +/** > + * gt801x_i2c_read - read data from a register of the i2c slave device. > + * > + * @client: i2c device. > + * @reg: the register to read from. > + * @buf: raw write data buffer. > + * @len: length of the buffer to write > + */ > +static int gt801x_i2c_read(struct i2c_client *client, > + u8 reg, u8 *buf, int len) > +{ > + struct i2c_msg msgs[2]; > + int ret; > + > + msgs[0].flags = 0; > + msgs[0].addr = client->addr; > + msgs[0].len = 1; > + msgs[0].buf = ® > + > + msgs[1].flags = I2C_M_RD; > + msgs[1].addr = client->addr; > + msgs[1].len = len; > + msgs[1].buf = buf; > + > + ret = i2c_transfer(client->adapter, msgs, 2); > + return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0); > +} > + > +/** > + * gt801x_process_events - Process incoming events > + * > + * @ts: our gt801x_ts_data pointer > + * > + * Called when the IRQ is triggered. Read the current device state, and push > + * the input events to the user space. > + */ > +static void gt801x_process_events(struct gt801x_ts_data *ts) > +{ > + u8 point_data[3 + GT801X_CONTACT_SIZE * GOODIX_MAX_CONTACTS]; > + u8 touch_map[GOODIX_MAX_CONTACTS] = {0}; > + int input_x, input_y, input_w; > + u8 checksum = 0; > + u16 touch_raw; > + u8 touch_num; > + int error; > + int loc; > + int i; > + > + error = gt801x_i2c_read(ts->client, GT801X_COOR_ADDR, > + point_data, sizeof(point_data)); > + if (error) { > + dev_err(&ts->client->dev, "I2C transfer error: %d\n", error); > + return; > + } > + > + /* Fetch touch mapping bits */ > + touch_raw = get_unaligned_le16(&point_data[0]); > + if (!touch_raw) > + return; > + > + /* Build touch map */ > + touch_num = 0; > + for (i = 0; (touch_raw != 0) && (i < ts->max_touch_num); i++) { > + if (touch_raw & 1) > + touch_map[touch_num++] = i; > + touch_raw >>= 1; > + } > + > + /* Calculate checksum */ > + for (i = 0; i < (touch_num*GT801X_CONTACT_SIZE + 3); i++) > + checksum += point_data[i]; > + if (checksum != 0) > + return; > + > + /* Report touches */ > + for (i = 0; i < touch_num; i++) { > + loc = 2 + GT801X_CONTACT_SIZE * i; > + input_x = get_unaligned_be16(&point_data[loc]); > + input_y = get_unaligned_be16(&point_data[loc + 2]); > + input_w = point_data[loc + 4]; > + > + input_mt_slot(ts->input_dev, i); > + input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); > + input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x); > + input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, input_y); > + input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w); > + input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w); > + } > + > + input_mt_sync_frame(ts->input_dev); > + input_sync(ts->input_dev); > +} > + > +/** > + * gt801x_ts_irq_handler - The IRQ handler > + * > + * @irq: interrupt number. > + * @dev_id: private data pointer. > + */ > +static irqreturn_t gt801x_ts_irq_handler(int irq, void *dev_id) > +{ > + gt801x_process_events((struct gt801x_ts_data *)dev_id); > + > + return IRQ_HANDLED; > +} > + > +/** > + * gt801x_read_config - Read the embedded configuration of the panel > + * > + * @ts: our gt801x_ts_data pointer > + * > + * Must be called during probe > + */ > +static void gt801x_read_config(struct gt801x_ts_data *ts) > +{ > + u8 config[GT801X_CONFIG_MAX_LENGTH]; > + int error; > + > + error = gt801x_i2c_read(ts->client, GT801X_CONFIG_DATA, > + config, > + GT801X_CONFIG_MAX_LENGTH); > + if (error) { > + dev_warn(&ts->client->dev, > + "Error reading config (%d), using defaults\n", > + error); > + ts->abs_x_max = GOODIX_MAX_WIDTH; > + ts->abs_y_max = GOODIX_MAX_HEIGHT; > + ts->int_trigger_type = GOODIX_INT_TRIGGER; > + ts->max_touch_num = GOODIX_MAX_CONTACTS; > + return; > + } > + > + ts->abs_x_max = get_unaligned_be16(&config[RESOLUTION_LOC]); > + ts->abs_y_max = get_unaligned_be16(&config[RESOLUTION_LOC + 2]); > + ts->int_trigger_type = config[TRIGGER_LOC] & 0x03; > + ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f; > + if (!ts->abs_x_max || !ts->abs_y_max || !ts->max_touch_num) { > + dev_err(&ts->client->dev, > + "Invalid config, using defaults\n"); > + ts->abs_x_max = GOODIX_MAX_WIDTH; > + ts->abs_y_max = GOODIX_MAX_HEIGHT; > + ts->max_touch_num = GOODIX_MAX_CONTACTS; > + } > +} > + > +/** > + * gt801x_read_version - Read GT801 2+1 touchscreen version > + * > + * @client: the i2c client > + * @version: output buffer containing the version on success > + * @id: output buffer containing the id on success > + */ > +static int gt801x_read_version(struct i2c_client *client, u16 *version, u16 *id) > +{ > + int error; > + u8 buf[16]; > + > + error = gt801x_i2c_read(client, GT801X_REG_ID, buf, sizeof(buf)); > + if (error) { > + dev_err(&client->dev, "read version failed: %d\n", error); > + return error; > + } > + /* TODO: version info contains 'GT801NI_3R15_1AV' */ > + print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, ARRAY_SIZE(buf)); > + *id = 0x802; > + *version = 0x15; > + dev_info(&client->dev, "ID %d, version: %04x\n", *id, *version); > + return 0; > +} > + > +/** > + * gt801x_i2c_test - I2C test function to check if the device answers. > + * > + * @client: the i2c client > + */ > +static int gt801x_i2c_test(struct i2c_client *client) > +{ > + int retry = 0; > + int error; > + u8 test; > + > + while (retry++ < 2) { > + error = gt801x_i2c_read(client, GT801X_CONFIG_DATA, > + &test, 1); > + if (!error) > + return 0; > + > + dev_err(&client->dev, "i2c test failed attempt %d: %d\n", > + retry, error); > + msleep(20); > + } > + > + return error; > +} > + > +/** > + * gt801x_request_input_dev - Allocate, populate and register the input device > + * > + * @ts: our gt801x_ts_data pointer > + * @version: device firmware version > + * @id: device ID > + * > + * Must be called during probe > + */ > +static int gt801x_request_input_dev(struct gt801x_ts_data *ts, > + u16 version, u16 id) > +{ > + int error; > + > + ts->input_dev = devm_input_allocate_device(&ts->client->dev); > + if (!ts->input_dev) { > + dev_err(&ts->client->dev, "Failed to allocate input device."); > + return -ENOMEM; > + } > + > + input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X, > + 0, ts->abs_x_max, 0, 0); > + input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y, > + 0, ts->abs_y_max, 0, 0); > + input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0); > + input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); > + > + input_mt_init_slots(ts->input_dev, ts->max_touch_num, > + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); > + > + ts->input_dev->name = "Goodix Capacitive TouchScreen (GT801 2+1)"; > + ts->input_dev->phys = "input/ts"; > + ts->input_dev->id.bustype = BUS_I2C; > + ts->input_dev->id.vendor = 0x0416; > + ts->input_dev->id.product = id; > + ts->input_dev->id.version = version; > + > + error = input_register_device(ts->input_dev); > + if (error) { > + dev_err(&ts->client->dev, > + "Failed to register input device: %d", error); > + return error; > + } > + > + return 0; > +} > + > +static int gt801x_ts_probe(struct i2c_client *client, > + const struct i2c_device_id *id) > +{ > + struct gt801x_ts_data *ts; > + unsigned long irq_flags; > + int error; > + u16 version_info, id_info; > + > + dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr); > + > + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { > + dev_err(&client->dev, "I2C check functionality failed.\n"); > + return -ENXIO; > + } > + > + ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); > + if (!ts) > + return -ENOMEM; > + > + ts->client = client; > + i2c_set_clientdata(client, ts); > + > + error = gt801x_i2c_test(client); > + if (error) { > + dev_err(&client->dev, "I2C communication failure: %d\n", error); > + return error; > + } > + > + error = gt801x_read_version(client, &version_info, &id_info); > + if (error) { > + dev_err(&client->dev, "Read version failed.\n"); > + return error; > + } > + > + gt801x_read_config(ts); > + > + error = gt801x_request_input_dev(ts, version_info, id_info); > + if (error) > + return error; > + > + irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT; > + error = devm_request_threaded_irq(&ts->client->dev, client->irq, > + NULL, gt801x_ts_irq_handler, > + irq_flags, client->name, ts); > + if (error) { > + dev_err(&client->dev, "request IRQ failed: %d\n", error); > + return error; > + } > + > + return 0; > +} > + > +static const struct i2c_device_id gt801x_ts_id[] = { > + { "GDIX1001:00", 0 }, > + { } > +}; > +MODULE_DEVICE_TABLE(i2c, gt801x_ts_id); > + > +#ifdef CONFIG_OF > +static const struct of_device_id gt801x_of_match[] = { > + { .compatible = "goodix,gt801_2plus1" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, gt801x_of_match); > +#endif > + > +static struct i2c_driver gt801x_ts_driver = { > + .probe = gt801x_ts_probe, > + .id_table = gt801x_ts_id, > + .driver = { > + .name = "Goodix-TS", > + .of_match_table = of_match_ptr(gt801x_of_match), > + }, > +}; > +module_i2c_driver(gt801x_ts_driver); > + > +MODULE_AUTHOR("Priit Laes <plaes@plaes.org>"); > +MODULE_DESCRIPTION("Goodix GT801 2+1 touchscreen driver"); > +MODULE_LICENSE("GPL v2"); > -- > 2.6.3 >
diff --git a/Documentation/devicetree/bindings/input/touchscreen/gt801_2plus1.txt b/Documentation/devicetree/bindings/input/touchscreen/gt801_2plus1.txt new file mode 100644 index 0000000..070ff5b --- /dev/null +++ b/Documentation/devicetree/bindings/input/touchscreen/gt801_2plus1.txt @@ -0,0 +1,23 @@ +Device tree bindings for Goodix GT801 2+1 series touchscreen controller + +Required properties: + + - compatible : Should be "goodix,gt801_2plus1" + - reg : I2C address of the chip. Should be 0x55 + - interrupt-parent : Interrupt controller to which the chip is connected + - interrupts : Interrupt to which the chip is connected + +Example: + + i2c@00000000 { + /* ... */ + + touchscreen@55 { + compatible = "goodix,gt801_2plus1"; + reg = <0x55>; + interrupt-parent = <&gpio>; + interrupts = <0 0>; + }; + + /* ... */ + }; diff --git a/MAINTAINERS b/MAINTAINERS index cba790b..e292126 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -4743,6 +4743,12 @@ L: linux-input@vger.kernel.org S: Maintained F: drivers/input/touchscreen/goodix.c +GOODIX GT801 2PLUS1 TOUCHSCREEN +M: Priit Laes <plaes@plaes.org> +L: linux-input@vger.kernel.org +S: Maintained +F: drivers/input/touchscreen/gt801_2plus1.c + GPIO SUBSYSTEM M: Linus Walleij <linus.walleij@linaro.org> M: Alexandre Courbot <gnurou@gmail.com> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index ae33da7..c7c3324 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -322,11 +322,11 @@ config TOUCHSCREEN_FUJITSU module will be called fujitsu-ts. config TOUCHSCREEN_GOODIX - tristate "Goodix I2C touchscreen" + tristate "Goodix GT9xx I2C touchscreen" depends on I2C help - Say Y here if you have the Goodix touchscreen (such as one - installed in Onda v975w tablets) connected to your + Say Y here if you have one of the Goodix GT9xx touchscreens + (such as one installed in Onda v975w tablet) connected to your system. It also supports 5-finger chip models, which can be found on ARM tablets, like Wexler TAB7200 and MSI Primo73. @@ -335,6 +335,19 @@ config TOUCHSCREEN_GOODIX To compile this driver as a module, choose M here: the module will be called goodix. +config TOUCHSCREEN_GT801_2PLUS1 + tristate "Goodix GT801 2+1 I2C touchscreen" + depends on I2C + help + Say Y here if you have the Goodix GT801 2+1 touchscreen. + This controller is found on some older ARM tablets like + (Gemei G9 and Zareason Zatab). + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called gt801_2plus1. + config TOUCHSCREEN_ILI210X tristate "Ilitek ILI210X based touchscreen" depends on I2C diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index cbaa6ab..ff25d1b4 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -38,6 +38,7 @@ obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o obj-$(CONFIG_TOUCHSCREEN_FT6236) += ft6236.o obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o +obj-$(CONFIG_TOUCHSCREEN_GT801_2PLUS1) += gt801_2plus1.o obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC) += imx6ul_tsc.o obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o diff --git a/drivers/input/touchscreen/gt801_2plus1.c b/drivers/input/touchscreen/gt801_2plus1.c new file mode 100644 index 0000000..e2be479 --- /dev/null +++ b/drivers/input/touchscreen/gt801_2plus1.c @@ -0,0 +1,375 @@ +/* + * Driver for Goodix GT801 2+1 ARM touchscreen controllers + * + * Copyright (c) 2015 Priit Laes <plaes@plaes.org>. + * + * This code is based on goodix.c driver (c) 2014 Red Hat Inc, + * various Android codedumps (c) 2010 - 2012 Goodix Technology + * and cleanups done by Emilio López (turl) for linux-sunxi. + * + * 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; version 2 of the License. + */ +#include <asm/unaligned.h> +#include <linux/delay.h> +#include <linux/i2c.h> +#include <linux/irq.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/input/mt.h> + +struct gt801x_ts_data { + struct i2c_client *client; + struct input_dev *input_dev; + int abs_x_max; + int abs_y_max; + unsigned int max_touch_num; + unsigned int int_trigger_type; +}; + +#define GOODIX_MAX_HEIGHT 4096 +#define GOODIX_MAX_WIDTH 4096 +#define GOODIX_INT_TRIGGER 1 +#define GOODIX_MAX_CONTACTS 10 +#define MAX_CONTACTS_LOC 5 +#define RESOLUTION_LOC 1 +#define TRIGGER_LOC 6 + +/* Register defines */ +#define GT801X_COOR_ADDR 0x01 +#define GT801X_CONFIG_DATA 0x65 +#define GT801X_REG_ID 0xf0 + +/* Device specific defines */ +#define GT801X_CONFIG_MAX_LENGTH 7 +#define GT801X_CONTACT_SIZE 5 + +static const unsigned long goodix_irq_flags[] = { + IRQ_TYPE_EDGE_RISING, + IRQ_TYPE_EDGE_FALLING, + IRQ_TYPE_LEVEL_LOW, + IRQ_TYPE_LEVEL_HIGH, +}; + +/** + * gt801x_i2c_read - read data from a register of the i2c slave device. + * + * @client: i2c device. + * @reg: the register to read from. + * @buf: raw write data buffer. + * @len: length of the buffer to write + */ +static int gt801x_i2c_read(struct i2c_client *client, + u8 reg, u8 *buf, int len) +{ + struct i2c_msg msgs[2]; + int ret; + + msgs[0].flags = 0; + msgs[0].addr = client->addr; + msgs[0].len = 1; + msgs[0].buf = ® + + msgs[1].flags = I2C_M_RD; + msgs[1].addr = client->addr; + msgs[1].len = len; + msgs[1].buf = buf; + + ret = i2c_transfer(client->adapter, msgs, 2); + return ret < 0 ? ret : (ret != ARRAY_SIZE(msgs) ? -EIO : 0); +} + +/** + * gt801x_process_events - Process incoming events + * + * @ts: our gt801x_ts_data pointer + * + * Called when the IRQ is triggered. Read the current device state, and push + * the input events to the user space. + */ +static void gt801x_process_events(struct gt801x_ts_data *ts) +{ + u8 point_data[3 + GT801X_CONTACT_SIZE * GOODIX_MAX_CONTACTS]; + u8 touch_map[GOODIX_MAX_CONTACTS] = {0}; + int input_x, input_y, input_w; + u8 checksum = 0; + u16 touch_raw; + u8 touch_num; + int error; + int loc; + int i; + + error = gt801x_i2c_read(ts->client, GT801X_COOR_ADDR, + point_data, sizeof(point_data)); + if (error) { + dev_err(&ts->client->dev, "I2C transfer error: %d\n", error); + return; + } + + /* Fetch touch mapping bits */ + touch_raw = get_unaligned_le16(&point_data[0]); + if (!touch_raw) + return; + + /* Build touch map */ + touch_num = 0; + for (i = 0; (touch_raw != 0) && (i < ts->max_touch_num); i++) { + if (touch_raw & 1) + touch_map[touch_num++] = i; + touch_raw >>= 1; + } + + /* Calculate checksum */ + for (i = 0; i < (touch_num*GT801X_CONTACT_SIZE + 3); i++) + checksum += point_data[i]; + if (checksum != 0) + return; + + /* Report touches */ + for (i = 0; i < touch_num; i++) { + loc = 2 + GT801X_CONTACT_SIZE * i; + input_x = get_unaligned_be16(&point_data[loc]); + input_y = get_unaligned_be16(&point_data[loc + 2]); + input_w = point_data[loc + 4]; + + input_mt_slot(ts->input_dev, i); + input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true); + input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x); + input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, input_y); + input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w); + input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w); + } + + input_mt_sync_frame(ts->input_dev); + input_sync(ts->input_dev); +} + +/** + * gt801x_ts_irq_handler - The IRQ handler + * + * @irq: interrupt number. + * @dev_id: private data pointer. + */ +static irqreturn_t gt801x_ts_irq_handler(int irq, void *dev_id) +{ + gt801x_process_events((struct gt801x_ts_data *)dev_id); + + return IRQ_HANDLED; +} + +/** + * gt801x_read_config - Read the embedded configuration of the panel + * + * @ts: our gt801x_ts_data pointer + * + * Must be called during probe + */ +static void gt801x_read_config(struct gt801x_ts_data *ts) +{ + u8 config[GT801X_CONFIG_MAX_LENGTH]; + int error; + + error = gt801x_i2c_read(ts->client, GT801X_CONFIG_DATA, + config, + GT801X_CONFIG_MAX_LENGTH); + if (error) { + dev_warn(&ts->client->dev, + "Error reading config (%d), using defaults\n", + error); + ts->abs_x_max = GOODIX_MAX_WIDTH; + ts->abs_y_max = GOODIX_MAX_HEIGHT; + ts->int_trigger_type = GOODIX_INT_TRIGGER; + ts->max_touch_num = GOODIX_MAX_CONTACTS; + return; + } + + ts->abs_x_max = get_unaligned_be16(&config[RESOLUTION_LOC]); + ts->abs_y_max = get_unaligned_be16(&config[RESOLUTION_LOC + 2]); + ts->int_trigger_type = config[TRIGGER_LOC] & 0x03; + ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f; + if (!ts->abs_x_max || !ts->abs_y_max || !ts->max_touch_num) { + dev_err(&ts->client->dev, + "Invalid config, using defaults\n"); + ts->abs_x_max = GOODIX_MAX_WIDTH; + ts->abs_y_max = GOODIX_MAX_HEIGHT; + ts->max_touch_num = GOODIX_MAX_CONTACTS; + } +} + +/** + * gt801x_read_version - Read GT801 2+1 touchscreen version + * + * @client: the i2c client + * @version: output buffer containing the version on success + * @id: output buffer containing the id on success + */ +static int gt801x_read_version(struct i2c_client *client, u16 *version, u16 *id) +{ + int error; + u8 buf[16]; + + error = gt801x_i2c_read(client, GT801X_REG_ID, buf, sizeof(buf)); + if (error) { + dev_err(&client->dev, "read version failed: %d\n", error); + return error; + } + /* TODO: version info contains 'GT801NI_3R15_1AV' */ + print_hex_dump_bytes("", DUMP_PREFIX_NONE, buf, ARRAY_SIZE(buf)); + *id = 0x802; + *version = 0x15; + dev_info(&client->dev, "ID %d, version: %04x\n", *id, *version); + return 0; +} + +/** + * gt801x_i2c_test - I2C test function to check if the device answers. + * + * @client: the i2c client + */ +static int gt801x_i2c_test(struct i2c_client *client) +{ + int retry = 0; + int error; + u8 test; + + while (retry++ < 2) { + error = gt801x_i2c_read(client, GT801X_CONFIG_DATA, + &test, 1); + if (!error) + return 0; + + dev_err(&client->dev, "i2c test failed attempt %d: %d\n", + retry, error); + msleep(20); + } + + return error; +} + +/** + * gt801x_request_input_dev - Allocate, populate and register the input device + * + * @ts: our gt801x_ts_data pointer + * @version: device firmware version + * @id: device ID + * + * Must be called during probe + */ +static int gt801x_request_input_dev(struct gt801x_ts_data *ts, + u16 version, u16 id) +{ + int error; + + ts->input_dev = devm_input_allocate_device(&ts->client->dev); + if (!ts->input_dev) { + dev_err(&ts->client->dev, "Failed to allocate input device."); + return -ENOMEM; + } + + input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X, + 0, ts->abs_x_max, 0, 0); + input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y, + 0, ts->abs_y_max, 0, 0); + input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0); + input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); + + input_mt_init_slots(ts->input_dev, ts->max_touch_num, + INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); + + ts->input_dev->name = "Goodix Capacitive TouchScreen (GT801 2+1)"; + ts->input_dev->phys = "input/ts"; + ts->input_dev->id.bustype = BUS_I2C; + ts->input_dev->id.vendor = 0x0416; + ts->input_dev->id.product = id; + ts->input_dev->id.version = version; + + error = input_register_device(ts->input_dev); + if (error) { + dev_err(&ts->client->dev, + "Failed to register input device: %d", error); + return error; + } + + return 0; +} + +static int gt801x_ts_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct gt801x_ts_data *ts; + unsigned long irq_flags; + int error; + u16 version_info, id_info; + + dev_dbg(&client->dev, "I2C Address: 0x%02x\n", client->addr); + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(&client->dev, "I2C check functionality failed.\n"); + return -ENXIO; + } + + ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); + if (!ts) + return -ENOMEM; + + ts->client = client; + i2c_set_clientdata(client, ts); + + error = gt801x_i2c_test(client); + if (error) { + dev_err(&client->dev, "I2C communication failure: %d\n", error); + return error; + } + + error = gt801x_read_version(client, &version_info, &id_info); + if (error) { + dev_err(&client->dev, "Read version failed.\n"); + return error; + } + + gt801x_read_config(ts); + + error = gt801x_request_input_dev(ts, version_info, id_info); + if (error) + return error; + + irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT; + error = devm_request_threaded_irq(&ts->client->dev, client->irq, + NULL, gt801x_ts_irq_handler, + irq_flags, client->name, ts); + if (error) { + dev_err(&client->dev, "request IRQ failed: %d\n", error); + return error; + } + + return 0; +} + +static const struct i2c_device_id gt801x_ts_id[] = { + { "GDIX1001:00", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, gt801x_ts_id); + +#ifdef CONFIG_OF +static const struct of_device_id gt801x_of_match[] = { + { .compatible = "goodix,gt801_2plus1" }, + { } +}; +MODULE_DEVICE_TABLE(of, gt801x_of_match); +#endif + +static struct i2c_driver gt801x_ts_driver = { + .probe = gt801x_ts_probe, + .id_table = gt801x_ts_id, + .driver = { + .name = "Goodix-TS", + .of_match_table = of_match_ptr(gt801x_of_match), + }, +}; +module_i2c_driver(gt801x_ts_driver); + +MODULE_AUTHOR("Priit Laes <plaes@plaes.org>"); +MODULE_DESCRIPTION("Goodix GT801 2+1 touchscreen driver"); +MODULE_LICENSE("GPL v2");
This patch adds Goodix GT801 2+1 touchscreen controller support. GT801 2+1 is a 10-finger touch controller consisting of ARM controller interfacing two GT801 5-finger controllers. Signed-off-by: Priit Laes <plaes@plaes.org> --- .../bindings/input/touchscreen/gt801_2plus1.txt | 23 ++ MAINTAINERS | 6 + drivers/input/touchscreen/Kconfig | 19 +- drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/gt801_2plus1.c | 375 +++++++++++++++++++++ 5 files changed, 421 insertions(+), 3 deletions(-) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/gt801_2plus1.txt create mode 100644 drivers/input/touchscreen/gt801_2plus1.c