Input: add support for SuperH MigoR touchscreen

This is V2 of the MigoR touch screen driver. The chip we interface to
is unfortunately a custom designed microcontroller speaking some
undocumented protocol over i2c.

The board specific code is expected to register this device as an i2c
chip using struct i2c_board_info [] and i2c_register_board_info().

[dtor@mail.ru: don't enable touchscreen if there are no users]
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 262 insertions, 0 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 565ec711c2ee..2cb4df0e0a7b 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -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
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 3c096d75651d..30e86816cd41 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -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
diff --git a/drivers/input/touchscreen/migor_ts.c b/drivers/input/touchscreen/migor_ts.c
new file mode 100644
index 000000000000..c1cd99d58981
--- /dev/null
+++ b/drivers/input/touchscreen/migor_ts.c
@@ -0,0 +1,250 @@
+/*
+ * 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);