Input: add support for SuperH MigoR touchscreen (885c316d) · Commits · 戴 / test

drivers/input/touchscreen/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -146,6 +146,17 @@ config TOUCHSCREEN_PENMOUNT
		To compile this driver as a module, choose M here: the
		module will be called penmount.

		config TOUCHSCREEN_MIGOR
		tristate "Renesas MIGO-R touchscreen"
		depends on SH_MIGOR && I2C
		help
		Say Y here to enable MIGO-R touchscreen support.

		If unsure, say N.

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

		config TOUCHSCREEN_TOUCHRIGHT
		tristate "Touchright serial touchscreen"
		select SERIO

drivers/input/touchscreen/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -12,6 +12,7 @@ obj-$(CONFIG_TOUCHSCREEN_CORGI) += corgi_ts.o
		obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
		obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
		obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
		obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o
		obj-$(CONFIG_TOUCHSCREEN_MTOUCH) += mtouch.o
		obj-$(CONFIG_TOUCHSCREEN_MK712) += mk712.o
		obj-$(CONFIG_TOUCHSCREEN_HP600) += hp680_ts_input.o

drivers/input/touchscreen/migor_ts.c

0 → 100644

+250 −0

Original line number	Diff line number	Diff line
		/*
		* Touch Screen driver for Renesas MIGO-R Platform
		*
		* Copyright (c) 2008 Magnus Damm
		* Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>,
		* Kenati Technologies Pvt Ltd.
		*
		* This file 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 file 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/module.h>
		#include <linux/kernel.h>
		#include <linux/input.h>
		#include <linux/interrupt.h>
		#include <asm/io.h>
		#include <linux/i2c.h>
		#include <linux/timer.h>

		#define EVENT_PENDOWN 1
		#define EVENT_REPEAT 2
		#define EVENT_PENUP 3

		struct migor_ts_priv {
		struct i2c_client *client;
		struct input_dev *input;
		struct delayed_work work;
		int irq;
		};

		static const u_int8_t migor_ts_ena_seq[17] = { 0x33, 0x22, 0x11,
		0x01, 0x06, 0x07, };
		static const u_int8_t migor_ts_dis_seq[17] = { };

		static void migor_ts_poscheck(struct work_struct *work)
		{
		struct migor_ts_priv *priv = container_of(work,
		struct migor_ts_priv,
		work.work);
		unsigned short xpos, ypos;
		unsigned char event;
		u_int8_t buf[16];

		memset(buf, 0, sizeof(buf));

		/* Set Index 0 */
		buf[0] = 0;
		if (i2c_master_send(priv->client, buf, 1) != 1) {
		dev_err(&priv->client->dev, "Unable to write i2c index\n");
		goto out;
		}

		/* Now do Page Read */
		if (i2c_master_recv(priv->client, buf, sizeof(buf)) != sizeof(buf)) {
		dev_err(&priv->client->dev, "Unable to read i2c page\n");
		goto out;
		}

		ypos = ((buf[9] & 0x03) << 8 \| buf[8]);
		xpos = ((buf[11] & 0x03) << 8 \| buf[10]);
		event = buf[12];

		if (event == EVENT_PENDOWN \|\| event == EVENT_REPEAT) {
		input_report_key(priv->input, BTN_TOUCH, 1);
		input_report_abs(priv->input, ABS_X, ypos); /X-Y swap/
		input_report_abs(priv->input, ABS_Y, xpos);
		input_sync(priv->input);
		} else if (event == EVENT_PENUP) {
		input_report_key(priv->input, BTN_TOUCH, 0);
		input_sync(priv->input);
		}
		out:
		enable_irq(priv->irq);
		}

		static irqreturn_t migor_ts_isr(int irq, void *dev_id)
		{
		struct migor_ts_priv *priv = dev_id;

		/* the touch screen controller chip is hooked up to the cpu
		* using i2c and a single interrupt line. the interrupt line
		* is pulled low whenever someone taps the screen. to deassert
		* the interrupt line we need to acknowledge the interrupt by
		* communicating with the controller over the slow i2c bus.
		*
		* we can't acknowledge from interrupt context since the i2c
		* bus controller may sleep, so we just disable the interrupt
		* here and handle the acknowledge using delayed work.
		*/

		disable_irq_nosync(irq);
		schedule_delayed_work(&priv->work, HZ / 20);

		return IRQ_HANDLED;
		}


		static int migor_ts_open(struct input_dev *dev)
		{
		struct migor_ts_priv *priv = input_get_drvdata(dev);
		struct i2c_client *client = priv->client;
		int count;

		/* enable controller */
		count = i2c_master_send(client, migor_ts_ena_seq,
		sizeof(migor_ts_ena_seq));
		if (count != sizeof(migor_ts_ena_seq)) {
		dev_err(&client->dev, "Unable to enable touchscreen.\n");
		return -ENXIO;
		}

		return 0;
		}

		static void migor_ts_close(struct input_dev *dev)
		{
		struct migor_ts_priv *priv = input_get_drvdata(dev);
		struct i2c_client *client = priv->client;

		disable_irq(priv->irq);

		/* cancel pending work and wait for migor_ts_poscheck() to finish */
		if (cancel_delayed_work_sync(&priv->work)) {
		/*
		* if migor_ts_poscheck was canceled we need to enable IRQ
		* here to balance disable done in migor_ts_isr.
		*/
		enable_irq(priv->irq);
		}

		/* disable controller */
		i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));

		enable_irq(priv->irq);
		}

		static int migor_ts_probe(struct i2c_client *client,
		const struct i2c_device_id *idp)
		{
		struct migor_ts_priv *priv;
		struct input_dev *input;
		int error;

		priv = kzalloc(sizeof(*priv), GFP_KERNEL);
		if (!priv) {
		dev_err(&client->dev, "failed to allocate driver data\n");
		error = -ENOMEM;
		goto err0;
		}

		dev_set_drvdata(&client->dev, priv);

		input = input_allocate_device();
		if (!input) {
		dev_err(&client->dev, "Failed to allocate input device.\n");
		error = -ENOMEM;
		goto err1;
		}

		input->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
		input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

		input_set_abs_params(input, ABS_X, 95, 955, 0, 0);
		input_set_abs_params(input, ABS_Y, 85, 935, 0, 0);

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

		input->open = migor_ts_open;
		input->close = migor_ts_close;

		input_set_drvdata(input, priv);

		priv->client = client;
		priv->input = input;
		INIT_DELAYED_WORK(&priv->work, migor_ts_poscheck);
		priv->irq = client->irq;

		error = input_register_device(input);
		if (error)
		goto err1;

		error = request_irq(priv->irq, migor_ts_isr, IRQF_TRIGGER_LOW,
		client->driver_name, priv);
		if (error) {
		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
		goto err2;
		}

		return 0;

		err2:
		input_unregister_device(input);
		input = NULL; /* so we dont try to free it below */
		err1:
		input_free_device(input);
		kfree(priv);
		err0:
		dev_set_drvdata(&client->dev, NULL);
		return error;
		}

		static int migor_ts_remove(struct i2c_client *client)
		{
		struct migor_ts_priv *priv = dev_get_drvdata(&client->dev);

		free_irq(priv->irq, priv);
		input_unregister_device(priv->input);
		kfree(priv);

		dev_set_drvdata(&client->dev, NULL);

		return 0;
		}

		static struct i2c_driver migor_ts_driver = {
		.driver = {
		.name = "migor_ts",
		},
		.probe = migor_ts_probe,
		.remove = migor_ts_remove,
		};

		static int __init migor_ts_init(void)
		{
		return i2c_add_driver(&migor_ts_driver);
		}

		static void __exit migor_ts_exit(void)
		{
		i2c_del_driver(&migor_ts_driver);
		}

		MODULE_DESCRIPTION("MigoR Touchscreen driver");
		MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
		MODULE_LICENSE("GPL");

		module_init(migor_ts_init);
		module_exit(migor_ts_exit);

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