Input: add driver for the Goodix touchpanel (ca96ea86) · Commits · 戴 / test

MAINTAINERS

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		@@ -4062,6 +4062,12 @@ L: linux-media@vger.kernel.org
		S: Maintained
		F: drivers/media/usb/go7007/

		GOODIX TOUCHSCREEN
		M: Bastien Nocera <hadess@hadess.net>
		L: linux-input@vger.kernel.org
		S: Maintained
		F: drivers/input/touchscreen/goodix.c

		GPIO SUBSYSTEM
		M: Linus Walleij <linus.walleij@linaro.org>
		M: Alexandre Courbot <gnurou@gmail.com>

drivers/input/touchscreen/Kconfig

+13 −0

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		@@ -295,6 +295,19 @@ config TOUCHSCREEN_FUJITSU
		To compile this driver as a module, choose M here: the
		module will be called fujitsu-ts.

		config TOUCHSCREEN_GOODIX
		tristate "Goodix I2C touchscreen"
		depends on I2C && ACPI
		help
		Say Y here if you have the Goodix touchscreen (such as one
		installed in Onda v975w tablets) connected to your
		system.

		If unsure, say N.

		To compile this driver as a module, choose M here: the
		module will be called goodix.

		config TOUCHSCREEN_ILI210X
		tristate "Ilitek ILI210X based touchscreen"
		depends on I2C

drivers/input/touchscreen/Makefile

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		@@ -34,6 +34,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
		obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
		obj-$(CONFIG_TOUCHSCREEN_EGALAX) += egalax_ts.o
		obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
		obj-$(CONFIG_TOUCHSCREEN_GOODIX) += goodix.o
		obj-$(CONFIG_TOUCHSCREEN_ILI210X) += ili210x.o
		obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o
		obj-$(CONFIG_TOUCHSCREEN_INTEL_MID) += intel-mid-touch.o

drivers/input/touchscreen/goodix.c

0 → 100644

+395 −0

Original line number	Diff line number	Diff line
		/*
		* Driver for Goodix Touchscreens
		*
		* Copyright (c) 2014 Red Hat Inc.
		*
		* This code is based on gt9xx.c authored by andrew@goodix.com:
		*
		* 2010 - 2012 Goodix Technology.
		*/

		/*
		* 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 <linux/kernel.h>
		#include <linux/i2c.h>
		#include <linux/input.h>
		#include <linux/input/mt.h>
		#include <linux/module.h>
		#include <linux/delay.h>
		#include <linux/irq.h>
		#include <linux/interrupt.h>
		#include <linux/slab.h>
		#include <asm/unaligned.h>

		struct goodix_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_CONTACT_SIZE 8
		#define GOODIX_MAX_CONTACTS 10

		#define GOODIX_CONFIG_MAX_LENGTH 240

		/* Register defines */
		#define GOODIX_READ_COOR_ADDR 0x814E
		#define GOODIX_REG_CONFIG_DATA 0x8047
		#define GOODIX_REG_VERSION 0x8140

		#define RESOLUTION_LOC 1
		#define TRIGGER_LOC 6

		static const unsigned long goodix_irq_flags[] = {
		IRQ_TYPE_EDGE_RISING,
		IRQ_TYPE_EDGE_FALLING,
		IRQ_TYPE_LEVEL_LOW,
		IRQ_TYPE_LEVEL_HIGH,
		};

		/**
		* goodix_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 goodix_i2c_read(struct i2c_client *client,
		u16 reg, u8 *buf, int len)
		{
		struct i2c_msg msgs[2];
		u16 wbuf = cpu_to_be16(reg);
		int ret;

		msgs[0].flags = 0;
		msgs[0].addr = client->addr;
		msgs[0].len = 2;
		msgs[0].buf = (u8 *) &wbuf;

		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);
		}

		static int goodix_ts_read_input_report(struct goodix_ts_data ts, u8 data)
		{
		int touch_num;
		int error;

		error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR, data,
		GOODIX_CONTACT_SIZE + 1);
		if (error) {
		dev_err(&ts->client->dev, "I2C transfer error: %d\n", error);
		return error;
		}

		touch_num = data[0] & 0x0f;
		if (touch_num > GOODIX_MAX_CONTACTS)
		return -EPROTO;

		if (touch_num > 1) {
		data += 1 + GOODIX_CONTACT_SIZE;
		error = goodix_i2c_read(ts->client,
		GOODIX_READ_COOR_ADDR +
		1 + GOODIX_CONTACT_SIZE,
		data,
		GOODIX_CONTACT_SIZE * (touch_num - 1));
		if (error)
		return error;
		}

		return touch_num;
		}

		static void goodix_ts_report_touch(struct goodix_ts_data ts, u8 coor_data)
		{
		int id = coor_data[0] & 0x0F;
		int input_x = get_unaligned_le16(&coor_data[1]);
		int input_y = get_unaligned_le16(&coor_data[3]);
		int input_w = get_unaligned_le16(&coor_data[5]);

		input_mt_slot(ts->input_dev, id);
		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);
		}

		/**
		* goodix_process_events - Process incoming events
		*
		* @ts: our goodix_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 goodix_process_events(struct goodix_ts_data *ts)
		{
		u8 point_data[1 + GOODIX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
		int touch_num;
		int i;

		touch_num = goodix_ts_read_input_report(ts, point_data);
		if (touch_num < 0)
		return;

		for (i = 0; i < touch_num; i++)
		goodix_ts_report_touch(ts,
		&point_data[1 + GOODIX_CONTACT_SIZE * i]);

		input_mt_sync_frame(ts->input_dev);
		input_sync(ts->input_dev);
		}

		/**
		* goodix_ts_irq_handler - The IRQ handler
		*
		* @irq: interrupt number.
		* @dev_id: private data pointer.
		*/
		static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
		{
		static const u8 end_cmd[] = {
		GOODIX_READ_COOR_ADDR >> 8,
		GOODIX_READ_COOR_ADDR & 0xff,
		0
		};
		struct goodix_ts_data *ts = dev_id;

		goodix_process_events(ts);

		if (i2c_master_send(ts->client, end_cmd, sizeof(end_cmd)) < 0)
		dev_err(&ts->client->dev, "I2C write end_cmd error\n");

		return IRQ_HANDLED;
		}

		/**
		* goodix_read_config - Read the embedded configuration of the panel
		*
		* @ts: our goodix_ts_data pointer
		*
		* Must be called during probe
		*/
		static void goodix_read_config(struct goodix_ts_data *ts)
		{
		u8 config[GOODIX_CONFIG_MAX_LENGTH];
		int error;

		error = goodix_i2c_read(ts->client, GOODIX_REG_CONFIG_DATA,
		config,
		GOODIX_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;
		return;
		}

		ts->abs_x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
		ts->abs_y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
		ts->int_trigger_type = (config[TRIGGER_LOC]) & 0x03;
		if (!ts->abs_x_max \|\| !ts->abs_y_max) {
		dev_err(&ts->client->dev,
		"Invalid config, using defaults\n");
		ts->abs_x_max = GOODIX_MAX_WIDTH;
		ts->abs_y_max = GOODIX_MAX_HEIGHT;
		}
		}


		/**
		* goodix_read_version - Read goodix touchscreen version
		*
		* @client: the i2c client
		* @version: output buffer containing the version on success
		*/
		static int goodix_read_version(struct i2c_client client, u16 version)
		{
		int error;
		u8 buf[6];

		error = goodix_i2c_read(client, GOODIX_REG_VERSION, buf, sizeof(buf));
		if (error) {
		dev_err(&client->dev, "read version failed: %d\n", error);
		return error;
		}

		if (version)
		*version = get_unaligned_le16(&buf[4]);

		dev_info(&client->dev, "IC VERSION: %6ph\n", buf);

		return 0;
		}

		/**
		* goodix_i2c_test - I2C test function to check if the device answers.
		*
		* @client: the i2c client
		*/
		static int goodix_i2c_test(struct i2c_client *client)
		{
		int retry = 0;
		int error;
		u8 test;

		while (retry++ < 2) {
		error = goodix_i2c_read(client, GOODIX_REG_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;
		}

		/**
		* goodix_request_input_dev - Allocate, populate and register the input device
		*
		* @ts: our goodix_ts_data pointer
		*
		* Must be called during probe
		*/
		static int goodix_request_input_dev(struct goodix_ts_data *ts)
		{
		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;
		}

		ts->input_dev->evbit[0] = BIT_MASK(EV_SYN) \|
		BIT_MASK(EV_KEY) \|
		BIT_MASK(EV_ABS);

		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, GOODIX_MAX_CONTACTS,
		INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);

		ts->input_dev->name = "Goodix Capacitive TouchScreen";
		ts->input_dev->phys = "input/ts";
		ts->input_dev->id.bustype = BUS_I2C;
		ts->input_dev->id.vendor = 0x0416;
		ts->input_dev->id.product = 0x1001;
		ts->input_dev->id.version = 10427;

		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 goodix_ts_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct goodix_ts_data *ts;
		unsigned long irq_flags;
		int error;
		u16 version_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 = goodix_i2c_test(client);
		if (error) {
		dev_err(&client->dev, "I2C communication failure: %d\n", error);
		return error;
		}

		error = goodix_read_version(client, &version_info);
		if (error) {
		dev_err(&client->dev, "Read version failed.\n");
		return error;
		}

		goodix_read_config(ts);

		error = goodix_request_input_dev(ts);
		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, goodix_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 goodix_ts_id[] = {
		{ "GDIX1001:00", 0 },
		{ }
		};

		static const struct acpi_device_id goodix_acpi_match[] = {
		{ "GDIX1001", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(acpi, goodix_acpi_match);

		static struct i2c_driver goodix_ts_driver = {
		.probe = goodix_ts_probe,
		.id_table = goodix_ts_id,
		.driver = {
		.name = "Goodix-TS",
		.owner = THIS_MODULE,
		.acpi_match_table = goodix_acpi_match,
		},
		};
		module_i2c_driver(goodix_ts_driver);

		MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
		MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
		MODULE_DESCRIPTION("Goodix touchscreen driver");
		MODULE_LICENSE("GPL v2");

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