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().
Changes since V1:
- added cancel_delayed_work_sync()
- added interrupt handler comment
Signed-off-by: Magnus Damm <damm@xxxxxxxxxx>
---
drivers/input/touchscreen/Kconfig | 12 +
drivers/input/touchscreen/Makefile | 1
drivers/input/touchscreen/migor_ts.c | 213 ++++++++++++++++++++++++++++++++++
3 files changed, 226 insertions(+)
--- 0001/drivers/input/touchscreen/Kconfig
+++ work/drivers/input/touchscreen/Kconfig 2008-03-28 15:19:11.000000000 +0900
@@ -134,6 +134,18 @@ config TOUCHSCREEN_HP7XX
To compile this driver as a module, choose M here: the
module will be called jornada720_ts.
+config TOUCHSCREEN_MIGOR
+ tristate "Renesas MIGO-R touchscreen"
+ depends on SH_MIGOR
+ default n
+ 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_PENMOUNT
tristate "Penmount serial touchscreen"
select SERIO
--- 0001/drivers/input/touchscreen/Makefile
+++ work/drivers/input/touchscreen/Makefile 2008-03-28 15:19:11.000000000 +0900
@@ -19,3 +19,4 @@ obj-$(CONFIG_TOUCHSCREEN_PENMOUNT) += pe
obj-$(CONFIG_TOUCHSCREEN_TOUCHRIGHT) += touchright.o
obj-$(CONFIG_TOUCHSCREEN_TOUCHWIN) += touchwin.o
obj-$(CONFIG_TOUCHSCREEN_UCB1400) += ucb1400_ts.o
+obj-$(CONFIG_TOUCHSCREEN_MIGOR) += migor_ts.o
--- /dev/null
+++ work/drivers/input/touchscreen/migor_ts.c 2008-03-28 16:19:02.000000000 +0900
@@ -0,0 +1,213 @@
+/*
+ * Touch Screen driver for Renesas MIGO-R Platform
+ *
+ * Copyright (c) 2008 Magnus Damm
+ * Copyright (c) 2007 Ujjwal Pande <ujjwal@xxxxxxxxxx>,
+ * 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_report_abs(priv->input, ABS_PRESSURE, 120);
+ input_sync(priv->input);
+ } else if (event == EVENT_PENUP) {
+ input_report_abs(priv->input, ABS_PRESSURE, 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_probe(struct i2c_client *client)
+{
+ struct migor_ts_priv *priv;
+ int res = 0;
+
+ priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+ if (priv == NULL) {
+ dev_err(&client->dev, "failed to allocate driver data\n");
+ res = -ENOMEM;
+ goto err0;
+ }
+
+ dev_set_drvdata(&client->dev, priv);
+ priv->client = client;
+ INIT_DELAYED_WORK(&priv->work, migor_ts_poscheck);
+ priv->irq = client->irq;
+
+ priv->input = input_allocate_device();
+ if (!priv->input) {
+ dev_err(&client->dev, "Failed to allocate input device.\n");
+ res = -ENOMEM;
+ goto err1;
+ }
+
+ priv->input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+ priv->input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+ input_set_abs_params(priv->input, ABS_X, 95, 955, 0, 0);
+ input_set_abs_params(priv->input, ABS_Y, 85, 935, 0, 0);
+ input_set_abs_params(priv->input, ABS_PRESSURE, 0, 0, 0, 0);
+
+ priv->input->name = client->driver_name;
+ priv->input->phys = "input/event0";
+ priv->input->id.bustype = BUS_ISA;
+
+ res = input_register_device(priv->input);
+ if (res) {
+ input_free_device(priv->input);
+ goto err1;
+ }
+
+ if (request_irq(priv->irq, migor_ts_isr, IRQF_TRIGGER_LOW,
+ client->driver_name, priv)) {
+ dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+ res = -EBUSY;
+ goto err2;
+ }
+
+ /* enable controller */
+ if (i2c_master_send(client, migor_ts_ena_seq, sizeof(migor_ts_ena_seq))
+ == sizeof(migor_ts_ena_seq))
+ return 0;
+
+ dev_err(&client->dev, "Unable to enable touchscreen.\n");
+
+ free_irq(priv->irq, priv);
+ err2:
+ input_unregister_device(priv->input);
+ err1:
+ kfree(priv);
+ err0:
+ return res;
+}
+
+static int migor_ts_remove(struct i2c_client *client)
+{
+ struct migor_ts_priv *priv = dev_get_drvdata(&client->dev);
+ int ret;
+
+ /* cancel pending work and wait for migor_ts_poscheck() to finish */
+ ret = cancel_delayed_work_sync(&priv->work);
+ if (ret)
+ return ret;
+
+ /* disable controller */
+ i2c_master_send(client, migor_ts_dis_seq, sizeof(migor_ts_dis_seq));
+
+ free_irq(priv->irq, priv);
+ input_unregister_device(priv->input);
+ kfree(priv);
+ return ret;
+}
+
+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@xxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
+
+module_init(migor_ts_init);
+module_exit(migor_ts_exit);
--
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