Input: cy8ctmg110 - capacitive touchscreen support

Add support for the cy8ctmg110 capacitive touchscreen used on some
embedded devices.

(Some clean up by Alan Cox)

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

3 files changed, 379 insertions, 1 deletions

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 7bfcfdff6cf8..61f35184f76c 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -98,6 +98,20 @@ config TOUCHSCREEN_BITSY
           To compile this driver as a module, choose M here: the
           module will be called h3600_ts_input.
 
+config TOUCHSCREEN_CY8CTMG110
+        tristate "cy8ctmg110 touchscreen"
+        depends on I2C
+        depends on GPIOLIB
+
+        help
+          Say Y here if you have a cy8ctmg110 capacitive touchscreen on
+          an AAVA device.
+
+          If unsure, say N.
+
+          To compile this driver as a module, choose M here: the
+          module will be called cy8ctmg110_ts.
+
 config TOUCHSCREEN_DA9034
         tristate "Touchscreen support for Dialog Semiconductor DA9034"
         depends on PMIC_DA903X
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 779de0d9d413..bd6f30b4ff70 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -14,6 +14,8 @@ obj-$(CONFIG_TOUCHSCREEN_AD7879_SPI)	+= ad7879-spi.o
 obj-$(CONFIG_TOUCHSCREEN_ADS7846)       += ads7846.o
 obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC)  += atmel_tsadcc.o
 obj-$(CONFIG_TOUCHSCREEN_BITSY)         += h3600_ts_input.o
+obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110)    += cy8ctmg110_ts.o
+obj-$(CONFIG_TOUCHSCREEN_DA9034)        += da9034-ts.o
 obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)       += dynapro.o
 obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)     += hampshire.o
 obj-$(CONFIG_TOUCHSCREEN_GUNZE)         += gunze.o
@@ -41,7 +43,6 @@ obj-$(CONFIG_TOUCHSCREEN_TSC2007)	+= tsc2007.o
 obj-$(CONFIG_TOUCHSCREEN_UCB1400)       += ucb1400_ts.o
 obj-$(CONFIG_TOUCHSCREEN_WACOM_W8001)   += wacom_w8001.o
 obj-$(CONFIG_TOUCHSCREEN_WM97XX)        += wm97xx-ts.o
-obj-$(CONFIG_TOUCHSCREEN_DA9034)        += da9034-ts.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705)  += wm9705.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712)  += wm9712.o
 wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713)  += wm9713.o
diff --git a/drivers/input/touchscreen/cy8ctmg110_ts.c b/drivers/input/touchscreen/cy8ctmg110_ts.c
new file mode 100644
index 000000000000..4eb7df0b7f87
--- /dev/null
+++ b/drivers/input/touchscreen/cy8ctmg110_ts.c
@@ -0,0 +1,363 @@
+/*
+ * Driver for cypress touch screen controller
+ *
+ * Copyright (c) 2009 Aava Mobile
+ *
+ * Some cleanups by Alan Cox <alan@linux.intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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 program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/input/cy8ctmg110_pdata.h>
+
+#define CY8CTMG110_DRIVER_NAME      "cy8ctmg110"
+
+/* Touch coordinates */
+#define CY8CTMG110_X_MIN                0
+#define CY8CTMG110_Y_MIN                0
+#define CY8CTMG110_X_MAX                759
+#define CY8CTMG110_Y_MAX                465
+
+
+/* cy8ctmg110 register definitions */
+#define CY8CTMG110_TOUCH_WAKEUP_TIME    0
+#define CY8CTMG110_TOUCH_SLEEP_TIME     2
+#define CY8CTMG110_TOUCH_X1             3
+#define CY8CTMG110_TOUCH_Y1             5
+#define CY8CTMG110_TOUCH_X2             7
+#define CY8CTMG110_TOUCH_Y2             9
+#define CY8CTMG110_FINGERS              11
+#define CY8CTMG110_GESTURE              12
+#define CY8CTMG110_REG_MAX              13
+
+
+/*
+ * The touch driver structure.
+ */
+struct cy8ctmg110 {
+        struct input_dev *input;
+        char phys[32];
+        struct i2c_client *client;
+        int reset_pin;
+        int irq_pin;
+};
+
+/*
+ * cy8ctmg110_power is the routine that is called when touch hardware
+ * will powered off or on.
+ */
+static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
+{
+        if (ts->reset_pin)
+                gpio_direction_output(ts->reset_pin, 1 - poweron);
+}
+
+static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
+                unsigned char len, unsigned char *value)
+{
+        struct i2c_client *client = tsc->client;
+        unsigned int ret;
+        unsigned char i2c_data[6];
+
+        BUG_ON(len > 5);
+
+        i2c_data[0] = reg;
+        memcpy(i2c_data + 1, value, len);
+
+        ret = i2c_master_send(client, i2c_data, len + 1);
+        if (ret != 1) {
+                dev_err(&client->dev, "i2c write data cmd failed\n");
+                return ret;
+        }
+
+        return 0;
+}
+
+static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
+                unsigned char *data, unsigned char len, unsigned char cmd)
+{
+        struct i2c_client *client = tsc->client;
+        unsigned int ret;
+        struct i2c_msg msg[2] = {
+                /* first write slave position to i2c devices */
+                { client->addr, 0, 1, &cmd },
+                /* Second read data from position */
+                { client->addr, I2C_M_RD, len, data }
+        };
+
+        ret = i2c_transfer(client->adapter, msg, 2);
+        if (ret < 0)
+                return ret;
+
+        return 0;
+}
+
+static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
+{
+        struct input_dev *input = tsc->input;
+        unsigned char reg_p[CY8CTMG110_REG_MAX];
+        int x, y;
+
+        memset(reg_p, 0, CY8CTMG110_REG_MAX);
+
+        /* Reading coordinates */
+        if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
+                return -EIO;
+
+        y = reg_p[2] << 8 | reg_p[3];
+        x = reg_p[0] << 8 | reg_p[1];
+
+        /* Number of touch */
+        if (reg_p[8] == 0) {
+                input_report_key(input, BTN_TOUCH, 0);
+        } else  {
+                input_report_key(input, BTN_TOUCH, 1);
+                input_report_abs(input, ABS_X, x);
+                input_report_abs(input, ABS_Y, y);
+        }
+
+        input_sync(input);
+
+        return 0;
+}
+
+static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
+{
+        unsigned char reg_p[3];
+
+        if (sleep) {
+                reg_p[0] = 0x00;
+                reg_p[1] = 0xff;
+                reg_p[2] = 5;
+        } else {
+                reg_p[0] = 0x10;
+                reg_p[1] = 0xff;
+                reg_p[2] = 0;
+        }
+
+        return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
+}
+
+static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
+{
+        struct cy8ctmg110 *tsc = dev_id;
+
+        cy8ctmg110_touch_pos(tsc);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit cy8ctmg110_probe(struct i2c_client *client,
+                                        const struct i2c_device_id *id)
+{
+        const struct cy8ctmg110_pdata *pdata = client->dev.platform_data;
+        struct cy8ctmg110 *ts;
+        struct input_dev *input_dev;
+        int err;
+
+        /* No pdata no way forward */
+        if (pdata == NULL) {
+                dev_err(&client->dev, "no pdata\n");
+                return -ENODEV;
+        }
+
+        if (!i2c_check_functionality(client->adapter,
+                                        I2C_FUNC_SMBUS_READ_WORD_DATA))
+                return -EIO;
+
+        ts = kzalloc(sizeof(struct cy8ctmg110), GFP_KERNEL);
+        input_dev = input_allocate_device();
+        if (!ts || !input_dev) {
+                err = -ENOMEM;
+                goto err_free_mem;
+        }
+
+        ts->client = client;
+        ts->input = input_dev;
+
+        snprintf(ts->phys, sizeof(ts->phys),
+                 "%s/input0", dev_name(&client->dev));
+
+        input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
+        input_dev->phys = ts->phys;
+        input_dev->id.bustype = BUS_I2C;
+        input_dev->dev.parent = &client->dev;
+
+        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
+        input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+        input_set_abs_params(input_dev, ABS_X,
+                        CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 0, 0);
+        input_set_abs_params(input_dev, ABS_Y,
+                        CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 0, 0);
+
+        if (ts->reset_pin) {
+                err = gpio_request(ts->reset_pin, NULL);
+                if (err) {
+                        dev_err(&client->dev,
+                                "Unable to request GPIO pin %d.\n",
+                                ts->reset_pin);
+                        goto err_free_mem;
+                }
+        }
+
+        cy8ctmg110_power(ts, true);
+        cy8ctmg110_set_sleepmode(ts, false);
+
+        err = gpio_request(ts->irq_pin, "touch_irq_key");
+        if (err < 0) {
+                dev_err(&client->dev,
+                        "Failed to request GPIO %d, error %d\n",
+                        ts->irq_pin, err);
+                goto err_shutoff_device;
+        }
+
+        err = gpio_direction_input(ts->irq_pin);
+        if (err < 0) {
+                dev_err(&client->dev,
+                        "Failed to configure input direction for GPIO %d, error %d\n",
+                        ts->irq_pin, err);
+                goto err_free_irq_gpio;
+        }
+
+        client->irq = gpio_to_irq(ts->irq_pin);
+        if (client->irq < 0) {
+                err = client->irq;
+                dev_err(&client->dev,
+                        "Unable to get irq number for GPIO %d, error %d\n",
+                        ts->irq_pin, err);
+                goto err_free_irq_gpio;
+        }
+
+        err = request_threaded_irq(client->irq, NULL, cy8ctmg110_irq_thread,
+                                   IRQF_TRIGGER_RISING, "touch_reset_key", ts);
+        if (err < 0) {
+                dev_err(&client->dev,
+                        "irq %d busy? error %d\n", client->irq, err);
+                goto err_free_irq_gpio;
+        }
+
+        err = input_register_device(input_dev);
+        if (err)
+                goto err_free_irq;
+
+        i2c_set_clientdata(client, ts);
+        device_init_wakeup(&client->dev, 1);
+        return 0;
+
+err_free_irq:
+        free_irq(client->irq, ts);
+err_free_irq_gpio:
+        gpio_free(ts->irq_pin);
+err_shutoff_device:
+        cy8ctmg110_set_sleepmode(ts, true);
+        cy8ctmg110_power(ts, false);
+        if (ts->reset_pin)
+                gpio_free(ts->reset_pin);
+err_free_mem:
+        input_free_device(input_dev);
+        kfree(ts);
+        return err;
+}
+
+#ifdef CONFIG_PM
+static int cy8ctmg110_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+        struct cy8ctmg110 *ts = i2c_get_clientdata(client);
+
+        if (device_may_wakeup(&client->dev))
+                enable_irq_wake(client->irq);
+        else {
+                cy8ctmg110_set_sleepmode(ts, true);
+                cy8ctmg110_power(ts, false);
+        }
+        return 0;
+}
+
+static int cy8ctmg110_resume(struct i2c_client *client)
+{
+        struct cy8ctmg110 *ts = i2c_get_clientdata(client);
+
+        if (device_may_wakeup(&client->dev))
+                disable_irq_wake(client->irq);
+        else {
+                cy8ctmg110_power(ts, true);
+                cy8ctmg110_set_sleepmode(ts, false);
+        }
+        return 0;
+}
+#endif
+
+static int __devexit cy8ctmg110_remove(struct i2c_client *client)
+{
+        struct cy8ctmg110 *ts = i2c_get_clientdata(client);
+
+        cy8ctmg110_set_sleepmode(ts, true);
+        cy8ctmg110_power(ts, false);
+
+        free_irq(client->irq, ts);
+        input_unregister_device(ts->input);
+        gpio_free(ts->irq_pin);
+        if (ts->reset_pin)
+                gpio_free(ts->reset_pin);
+        kfree(ts);
+
+        return 0;
+}
+
+static struct i2c_device_id cy8ctmg110_idtable[] = {
+        { CY8CTMG110_DRIVER_NAME, 1 },
+        { }
+};
+
+MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
+
+static struct i2c_driver cy8ctmg110_driver = {
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = CY8CTMG110_DRIVER_NAME,
+        },
+        .id_table       = cy8ctmg110_idtable,
+        .probe          = cy8ctmg110_probe,
+        .remove         = __devexit_p(cy8ctmg110_remove),
+#ifdef CONFIG_PM
+        .suspend        = cy8ctmg110_suspend,
+        .resume         = cy8ctmg110_resume,
+#endif
+};
+
+static int __init cy8ctmg110_init(void)
+{
+        return i2c_add_driver(&cy8ctmg110_driver);
+}
+
+static void __exit cy8ctmg110_exit(void)
+{
+        i2c_del_driver(&cy8ctmg110_driver);
+}
+
+module_init(cy8ctmg110_init);
+module_exit(cy8ctmg110_exit);
+
+MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
+MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
+MODULE_LICENSE("GPL v2");