Subject: [FOR COMMENT] cy8ctmg110 for review
From: Samuli Konttila <[email protected]>
Add support for the cy8ctmg110 capacitive touchscreen used on some embedded
devices.
(Some clean up by Alan Cox)
(No signed off, not yet ready to go in)
---
drivers/input/touchscreen/Kconfig | 12 +
drivers/input/touchscreen/Makefile | 3
drivers/input/touchscreen/cy8ctmg110_ts.c | 521 +++++++++++++++++++++++++++++
3 files changed, 535 insertions(+), 1 deletions(-)
create mode 100644 drivers/input/touchscreen/cy8ctmg110_ts.c
diff --git a/drivers/input/touchscreen/Kconfig
b/drivers/input/touchscreen/Kconfig
index b3ba374..89a3eb1 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -591,4 +591,16 @@ config TOUCHSCREEN_TPS6507X
To compile this driver as a module, choose M here: the
module will be called tps6507x_ts.
+config TOUCHSCREEN_CY8CTMG110
+ tristate "cy8ctmg110 touchscreen"
+ depends on I2C
+ help
+ Say Y here if you have a cy8ctmg110 touchscreen capacitive
+ touchscreen
+
+ If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cy8ctmg110_ts.
+
endif
diff --git a/drivers/input/touchscreen/Makefile
b/drivers/input/touchscreen/Makefile
index dfb7239..c7acb65 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -1,5 +1,5 @@
#
-# Makefile for the touchscreen drivers.
+# Makefile for the touchscreen drivers.mororor
#
# Each configuration option enables a list of files.
@@ -12,6 +12,7 @@ obj-$(CONFIG_TOUCHSCREEN_AD7879) += ad7879.o
obj-$(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_DYNAPRO) += dynapro.o
obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
diff --git a/drivers/input/touchscreen/cy8ctmg110_ts.c
b/drivers/input/touchscreen/cy8ctmg110_ts.c
new file mode 100644
index 0000000..4adbe87
--- /dev/null
+++ b/drivers/input/touchscreen/cy8ctmg110_ts.c
@@ -0,0 +1,521 @@
+/*
+ * cy8ctmg110_ts.c Driver for cypress touch screen controller
+ * Copyright (c) 2009 Aava Mobile
+ *
+ * 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 <asm/io.h>
+#include <linux/i2c.h>
+#include <linux/timer.h>
+#include <linux/gpio.h>
+#include <linux/hrtimer.h>
+
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <asm/ioctl.h>
+#include <asm/uaccess.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <asm/ioctl.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+
+
+#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
+
+
+/*HW definations*/
+#define CY8CTMG110_RESET_PIN_GPIO 43
+#define CY8CTMG110_IRQ_PIN_GPIO 59
+#define CY8CTMG110_I2C_ADDR 0x38
+#define CY8CTMG110_I2C_ADDR_EXT 0x39
+#define CY8CTMG110_I2C_ADDR_ 0x2 /*i2c address first sample */
+#define CY8CTMG110_I2C_ADDR__ 53 /*i2c address to FW where irq support
missing */
+#define CY8CTMG110_TOUCH_IRQ 21
+#define CY8CTMG110_TOUCH_LENGHT 9787
+#define CY8CTMG110_SCREEN_LENGHT 8424
+
+
+/*Touch coordinates*/
+#define CY8CTMG110_X_MIN 0
+#define CY8CTMG110_Y_MIN 0
+#define CY8CTMG110_X_MAX 864
+#define CY8CTMG110_Y_MAX 480
+
+
+/*cy8ctmg110 registers defination*/
+#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
+
+#define CY8CTMG110_POLL_TIMER_DELAY 1000*1000*100
+#define TOUCH_MAX_I2C_FAILS 50
+
+/* Scale factors for coordinates */
+#define X_SCALE_FACTOR 9387/8424
+#define Y_SCALE_FACTOR 97/100
+
+/* For tracing */
+static int g_y_trace_coord = 0;
+module_param(g_y_trace_coord, int, 0600);
+
+/* Polling mode */
+static int polling = 0;
+module_param(polling, int, 0);
+MODULE_PARM_DESC(polling, "Set to enabling polling of the touchscreen");
+
+
+/*
+ * The touch position structure.
+ */
+struct ts_event {
+ int x1;
+ int y1;
+ int x2;
+ int y2;
+ bool event_sended;
+};
+
+/*
+ * The touch driver structure.
+ */
+struct cy8ctmg110 {
+ struct input_dev *input;
+ char phys[32];
+ struct ts_event tc;
+ struct i2c_client *client;
+ bool pending;
+ spinlock_t lock;
+ bool initController;
+ bool sleepmode;
+ int i2c_fail_count;
+ struct hrtimer timer;
+};
+
+/*
+ * cy8ctmg110_poweroff is the routine that is called when touch hardware
+ * will powered off
+ */
+static void cy8ctmg110_power(bool poweron)
+{
+ if (poweron)
+ gpio_direction_output(CY8CTMG110_RESET_PIN_GPIO, 0);
+ else
+ gpio_direction_output(CY8CTMG110_RESET_PIN_GPIO, 1);
+}
+
+/*
+ * cy8ctmg110_write_req write regs to the i2c devices
+ *
+ */
+static int cy8ctmg110_write_req(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[] = { 0, 0, 0, 0, 0, 0 };
+ struct i2c_msg msg[] = {
+ {client->addr, 0, len + 1, i2c_data},
+ };
+
+ i2c_data[0] = reg;
+ memcpy(i2c_data + 1, value, len);
+
+ ret = i2c_transfer(client->adapter, msg, 1);
+ if (ret != 1) {
+ printk("cy8ctmg110 touch : i2c write data cmd failed \n");
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * cy8ctmg110_read_req read regs from i2c devise
+ *
+ */
+
+static int cy8ctmg110_read_req(struct cy8ctmg110 *tsc,
+ unsigned char *i2c_data, unsigned char len, unsigned char cmd)
+{
+ struct i2c_client *client = tsc->client;
+ unsigned int ret;
+ unsigned char regs_cmd[2] = { 0, 0 };
+ struct i2c_msg msg1[] = {
+ {client->addr, 0, 1, regs_cmd},
+ };
+ struct i2c_msg msg2[] = {
+ {client->addr, I2C_M_RD, len, i2c_data},
+ };
+
+ regs_cmd[0] = cmd;
+
+ /* first write slave position to i2c devices */
+ ret = i2c_transfer(client->adapter, msg1, 1);
+ if (ret != 1) {
+ tsc->i2c_fail_count++;
+ return ret;
+ }
+
+ /* Second read data from position */
+ ret = i2c_transfer(client->adapter, msg2, 1);
+ if (ret != 1) {
+ tsc->i2c_fail_count++;
+ return ret;
+ }
+ return 0;
+}
+
+/*
+ * cy8ctmg110_send_event delevery touch event to the userpace
+ * function use normal input interface
+ */
+static void cy8ctmg110_send_event(void *tsc)
+{
+ struct cy8ctmg110 *ts = tsc;
+ struct input_dev *input = ts->input;
+ u16 x, y;
+ u16 x2, y2;
+
+ x = ts->tc.x1;
+ y = ts->tc.y1;
+
+ if (ts->tc.event_sended == false) {
+ input_report_key(input, BTN_TOUCH, 1);
+ ts->pending = true;
+ x2 = (u16) (y * X_SCALE_FACTOR);
+ y2 = (u16) (x * Y_SCALE_FACTOR);
+ input_report_abs(input, ABS_X, x2);
+ input_report_abs(input, ABS_Y, y2);
+ input_sync(input);
+ if (g_y_trace_coord)
+ printk("cy8ctmg110 touch position X:%d (was = %d) Y:%d
(was = %d)\n", x2, y, y2, x);
+ }
+
+}
+
+/*
+ * cy8ctmg110_touch_pos check touch position from i2c devices
+ *
+ */
+static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
+{
+ unsigned char reg_p[CY8CTMG110_REG_MAX];
+ int x, y;
+
+ memset(reg_p, 0, CY8CTMG110_REG_MAX);
+
+ /*Reading coordinates */
+ if (cy8ctmg110_read_req(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) {
+ if (tsc->pending == true) {
+ struct input_dev *input = tsc->input;
+
+ input_report_key(input, BTN_TOUCH, 0);
+ tsc->tc.event_sended = true;
+ tsc->pending = false;
+ }
+ } else if (tsc->tc.x1 != x || tsc->tc.y1 != y) {
+ tsc->tc.y1 = y;
+ tsc->tc.x1 = x;
+ tsc->tc.event_sended = false;
+ cy8ctmg110_send_event(tsc);
+ }
+ return 0;
+}
+
+/*
+ * if interrupt isn't in use the touch positions can reads by polling
+ *
+ */
+static enum hrtimer_restart cy8ctmg110_timer(struct hrtimer *handle)
+{
+ struct cy8ctmg110 *ts = container_of(handle, struct cy8ctmg110, timer);
+ unsigned long flags;
+
+ spin_lock_irqsave(&ts->lock, flags);
+
+ cy8ctmg110_touch_pos(ts);
+ if (ts->i2c_fail_count < TOUCH_MAX_I2C_FAILS)
+ hrtimer_start(&ts->timer, ktime_set(0,
CY8CTMG110_POLL_TIMER_DELAY), HRTIMER_MODE_REL);
+
+ spin_unlock_irqrestore(&ts->lock, flags);
+ return HRTIMER_NORESTART;
+}
+
+/*
+ * cy8ctmg110_init_controller set init value to touchcontroller
+ *
+ */
+static bool cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts)
+{
+ unsigned char reg_p[3];
+
+ if (ts->sleepmode == true) {
+ 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;
+ }
+
+ if (cy8ctmg110_write_req(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p))
+ return false;
+
+ ts->initController = true;
+ return true;
+}
+
+/*
+ * cy8ctmg110_irq_handler irq handling function
+ *
+ */
+
+static irqreturn_t cy8ctmg110_irq_handler(int irq, void *dev_id)
+{
+ struct cy8ctmg110 *tsc = (struct cy8ctmg110 *) dev_id;
+
+ if (tsc->initController == false) {
+ if (cy8ctmg110_set_sleepmode(tsc) == true)
+ tsc->initController = true;
+ } else
+ cy8ctmg110_touch_pos(tsc);
+
+ /* if interrupt supported in the touch controller
+ timer polling need to stop */
+ tsc->i2c_fail_count = TOUCH_MAX_I2C_FAILS;
+ return IRQ_HANDLED;
+}
+
+
+static int cy8ctmg110_probe(struct i2c_client *client, const struct
i2c_device_id *id)
+{
+ struct cy8ctmg110 *ts;
+ struct input_dev *input_dev;
+ int err;
+ client->irq = CY8CTMG110_TOUCH_IRQ;
+
+ 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;
+ i2c_set_clientdata(client, ts);
+
+ ts->input = input_dev;
+ ts->pending = false;
+ ts->sleepmode = false;
+
+ 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;
+
+ spin_lock_init(&ts->lock);
+
+ input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP) |
+ BIT_MASK(EV_REL) | BIT_MASK(EV_ABS);
+ input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
+
+ input_set_capability(input_dev, EV_KEY, KEY_F);
+
+ 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);
+
+ err = gpio_request(CY8CTMG110_RESET_PIN_GPIO, NULL);
+
+ if (err) {
+ dev_err(&client->dev, "cy8ctmg110_ts: Unable to request GPIO
pin %d.\n",
+ CY8CTMG110_RESET_PIN_GPIO);
+ goto err_free_irq;
+ }
+ cy8ctmg110_power(true);
+
+ ts->initController = false;
+ ts->i2c_fail_count = 0;
+
+ hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+ ts->timer.function = cy8ctmg110_timer;
+
+ if (polling)
+ hrtimer_start(&ts->timer, ktime_set(10, 0), HRTIMER_MODE_REL);
+
+ /* Can we fall back to polling if these bits fail - something to look
+ at for robustness */
+
+ err = gpio_request(CY8CTMG110_IRQ_PIN_GPIO, "touch_irq_key");
+ if (err < 0) {
+ dev_err(&client->dev,
+ "cy8ctmg110_ts: failed to request GPIO %d, error %d\n",
+ CY8CTMG110_IRQ_PIN_GPIO, err);
+ goto err_free_timer;
+ }
+
+ err = gpio_direction_input(CY8CTMG110_IRQ_PIN_GPIO);
+
+ if (err < 0) {
+ dev_err(&client->dev,
+ "cy8ctmg110_ts: failed to configure input direction for
GPIO %d, error %d\n",
+ CY8CTMG110_IRQ_PIN_GPIO, err);
+ goto err_free_gpio;
+ }
+ client->irq = gpio_to_irq(CY8CTMG110_IRQ_PIN_GPIO);
+
+ if (client->irq < 0) {
+ err = client->irq;
+ dev_err(&client->dev,
+ "cy8ctmg110_ts: Unable to get irq number" " for GPIO %d, error %d\n",
+ CY8CTMG110_IRQ_PIN_GPIO, err);
+ goto err_free_gpio;
+ }
+ err = request_irq(client->irq, cy8ctmg110_irq_handler,
IRQF_TRIGGER_RISING | IRQF_SHARED, "touch_reset_key", ts);
+ if (err < 0) {
+ dev_err(&client->dev,
+ "cy8ctmg110 irq %d busy? error %d\n",
+ client->irq, err);
+ goto err_free_gpio;
+ }
+
+ err = input_register_device(input_dev);
+ if (!err)
+ return 0;
+err_free_gpio:
+ gpio_free(CY8CTMG110_IRQ_PIN_GPIO);
+err_free_timer:
+ if (polling)
+ hrtimer_cancel(&ts->timer);
+err_free_irq:
+ free_irq(client->irq, ts);
+err_free_mem:
+ input_free_device(input_dev);
+ kfree(ts);
+ return err;
+}
+
+/*
+ * cy8ctmg110_suspend
+ *
+ */
+
+static int cy8ctmg110_suspend(struct i2c_client *client, pm_message_t mesg)
+{
+ if (device_may_wakeup(&client->dev))
+ enable_irq_wake(client->irq);
+
+ return 0;
+}
+
+/*
+ * cy8ctmg110_resume
+ *
+ */
+
+static int cy8ctmg110_resume(struct i2c_client *client)
+{
+ if (device_may_wakeup(&client->dev))
+ disable_irq_wake(client->irq);
+
+ return 0;
+}
+
+/*
+ * cy8ctmg110_remove
+ *
+ */
+
+static int cy8ctmg110_remove(struct i2c_client *client)
+{
+ struct cy8ctmg110 *ts = i2c_get_clientdata(client);
+
+ cy8ctmg110_power(false);
+
+ if (polling)
+ hrtimer_cancel(&ts->timer);
+ free_irq(client->irq, ts);
+ input_unregister_device(ts->input);
+ /* FIXME: Do we need to free the GPIO ? */
+ 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,
+ .bus = &i2c_bus_type,
+ },
+ .id_table = cy8ctmg110_idtable,
+ .probe = cy8ctmg110_probe,
+ .remove = cy8ctmg110_remove,
+ .suspend = cy8ctmg110_suspend,
+ .resume = cy8ctmg110_resume,
+};
+
+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 <[email protected]>");
+MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
+MODULE_LICENSE("GPL v2");
--
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