Input: add driver for pixcir i2c touchscreens (36a281e2) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/input/touchscreen/Kconfig

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		@@ -458,6 +458,18 @@ config TOUCHSCREEN_UCB1400
		To compile this driver as a module, choose M here: the
		module will be called ucb1400_ts.

		config TOUCHSCREEN_PIXCIR
		tristate "PIXCIR I2C touchscreens"
		depends on I2C
		help
		Say Y here if you have a pixcir i2c touchscreen
		controller.

		If unsure, say N.

		To compile this driver as a module, choose M here: the
		module will be called pixcir_i2c_ts.

		config TOUCHSCREEN_WM831X
		tristate "Support for WM831x touchscreen controllers"
		depends on MFD_WM831X

drivers/input/touchscreen/Makefile

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		@@ -41,6 +41,7 @@ obj-$(CONFIG_TOUCHSCREEN_HTCPEN) += htcpen.o
		obj-$(CONFIG_TOUCHSCREEN_USB_COMPOSITE) += usbtouchscreen.o
		obj-$(CONFIG_TOUCHSCREEN_PCAP) += pcap_ts.o
		obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += penmount.o
		obj-$(CONFIG_TOUCHSCREEN_PIXCIR) += pixcir_i2c_ts.o
		obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o
		obj-$(CONFIG_TOUCHSCREEN_ST1232) += st1232.o
		obj-$(CONFIG_TOUCHSCREEN_STMPE) += stmpe-ts.o

drivers/input/touchscreen/pixcir_i2c_ts.c

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		/*
		* Driver for Pixcir I2C touchscreen controllers.
		*
		* Copyright (C) 2010-2011 Pixcir, Inc.
		*
		* 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.
		*
		* You should have received a copy of the GNU General Public
		* License along with this library; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/delay.h>
		#include <linux/module.h>
		#include <linux/interrupt.h>
		#include <linux/slab.h>
		#include <linux/i2c.h>
		#include <linux/input.h>
		#include <linux/input/pixcir_ts.h>

		struct pixcir_i2c_ts_data {
		struct i2c_client *client;
		struct input_dev *input;
		const struct pixcir_ts_platform_data *chip;
		bool exiting;
		};

		static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
		{
		struct pixcir_i2c_ts_data *tsdata = data;
		u8 rdbuf[10], wrbuf[1] = { 0 };
		u8 touch;
		int ret;

		ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
		if (ret != sizeof(wrbuf)) {
		dev_err(&tsdata->client->dev,
		"%s: i2c_master_send failed(), ret=%d\n",
		__func__, ret);
		return;
		}

		ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
		if (ret != sizeof(rdbuf)) {
		dev_err(&tsdata->client->dev,
		"%s: i2c_master_recv failed(), ret=%d\n",
		__func__, ret);
		return;
		}

		touch = rdbuf[0];
		if (touch) {
		u16 posx1 = (rdbuf[3] << 8) \| rdbuf[2];
		u16 posy1 = (rdbuf[5] << 8) \| rdbuf[4];
		u16 posx2 = (rdbuf[7] << 8) \| rdbuf[6];
		u16 posy2 = (rdbuf[9] << 8) \| rdbuf[8];

		input_report_key(tsdata->input, BTN_TOUCH, 1);
		input_report_abs(tsdata->input, ABS_X, posx1);
		input_report_abs(tsdata->input, ABS_Y, posy1);

		input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1);
		input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1);
		input_mt_sync(tsdata->input);

		if (touch == 2) {
		input_report_abs(tsdata->input,
		ABS_MT_POSITION_X, posx2);
		input_report_abs(tsdata->input,
		ABS_MT_POSITION_Y, posy2);
		input_mt_sync(tsdata->input);
		}
		} else {
		input_report_key(tsdata->input, BTN_TOUCH, 0);
		}

		input_sync(tsdata->input);
		}

		static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
		{
		struct pixcir_i2c_ts_data *tsdata = dev_id;

		while (!tsdata->exiting) {
		pixcir_ts_poscheck(tsdata);

		if (tsdata->chip->attb_read_val())
		break;

		msleep(20);
		}

		return IRQ_HANDLED;
		}

		#ifdef CONFIG_PM_SLEEP
		static int pixcir_i2c_ts_suspend(struct device *dev)
		{
		struct i2c_client *client = to_i2c_client(dev);

		if (device_may_wakeup(&client->dev))
		enable_irq_wake(client->irq);

		return 0;
		}

		static int pixcir_i2c_ts_resume(struct device *dev)
		{
		struct i2c_client *client = to_i2c_client(dev);

		if (device_may_wakeup(&client->dev))
		disable_irq_wake(client->irq);

		return 0;
		}
		#endif

		static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
		pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);

		static int __devinit pixcir_i2c_ts_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		const struct pixcir_ts_platform_data *pdata = client->dev.platform_data;
		struct pixcir_i2c_ts_data *tsdata;
		struct input_dev *input;
		int error;

		if (!pdata) {
		dev_err(&client->dev, "platform data not defined\n");
		return -EINVAL;
		}

		tsdata = kzalloc(sizeof(*tsdata), GFP_KERNEL);
		input = input_allocate_device();
		if (!tsdata \|\| !input) {
		dev_err(&client->dev, "Failed to allocate driver data!\n");
		error = -ENOMEM;
		goto err_free_mem;
		}

		tsdata->client = client;
		tsdata->input = input;
		tsdata->chip = pdata;

		input->name = client->name;
		input->id.bustype = BUS_I2C;
		input->dev.parent = &client->dev;

		__set_bit(EV_KEY, input->evbit);
		__set_bit(EV_ABS, input->evbit);
		__set_bit(BTN_TOUCH, input->keybit);
		input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
		input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
		input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
		input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);

		input_set_drvdata(input, tsdata);

		error = request_threaded_irq(client->irq, NULL, pixcir_ts_isr,
		IRQF_TRIGGER_FALLING,
		client->name, tsdata);
		if (error) {
		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
		goto err_free_mem;
		}

		error = input_register_device(input);
		if (error)
		goto err_free_irq;

		i2c_set_clientdata(client, tsdata);
		device_init_wakeup(&client->dev, 1);

		return 0;

		err_free_irq:
		free_irq(client->irq, tsdata);
		err_free_mem:
		input_free_device(input);
		kfree(tsdata);
		return error;
		}

		static int __devexit pixcir_i2c_ts_remove(struct i2c_client *client)
		{
		struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client);

		device_init_wakeup(&client->dev, 0);

		tsdata->exiting = true;
		mb();
		free_irq(client->irq, tsdata);

		input_unregister_device(tsdata->input);
		kfree(tsdata);

		return 0;
		}

		static const struct i2c_device_id pixcir_i2c_ts_id[] = {
		{ "pixcir_ts", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);

		static struct i2c_driver pixcir_i2c_ts_driver = {
		.driver = {
		.owner = THIS_MODULE,
		.name = "pixcir_ts",
		.pm = &pixcir_dev_pm_ops,
		},
		.probe = pixcir_i2c_ts_probe,
		.remove = __devexit_p(pixcir_i2c_ts_remove),
		.id_table = pixcir_i2c_ts_id,
		};

		static int __init pixcir_i2c_ts_init(void)
		{
		return i2c_add_driver(&pixcir_i2c_ts_driver);
		}
		module_init(pixcir_i2c_ts_init);

		static void __exit pixcir_i2c_ts_exit(void)
		{
		i2c_del_driver(&pixcir_i2c_ts_driver);
		}
		module_exit(pixcir_i2c_ts_exit);

		MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
		MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
		MODULE_LICENSE("GPL");

include/linux/input/pixcir_ts.h

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		#ifndef _PIXCIR_I2C_TS_H
		#define _PIXCIR_I2C_TS_H

		struct pixcir_ts_platform_data {
		int (*attb_read_val)(void);
		int x_max;
		int y_max;
		};

		#endif