Input: add support for SuperH MigoR touchscreen (885c316d) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/input/touchscreen/Kconfig

+11 −0

Original line number	Original line	Diff line number	Diff line
	@@ -146,6 +146,17 @@ config TOUCHSCREEN_PENMOUNT
	To compile this driver as a module, choose M here: the		To compile this driver as a module, choose M here: the
	module will be called penmount.		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		config TOUCHSCREEN_TOUCHRIGHT
	tristate "Touchright serial touchscreen"		tristate "Touchright serial touchscreen"
	select SERIO		select SERIO

drivers/input/touchscreen/Makefile

+1 −0

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

drivers/input/touchscreen/migor_ts.c

0 → 100644

+250 −0

Original line number	Original line	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);