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");
On Wed, 14 Apr 2010 13:54:02 +0100, Alan Cox wrote:
> 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
I confirm, not yet ready to go in ;)
> #
>
> # 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>
What a mess. Countless duplicates includes... Seriously, I'm not even
reviewing further.
--
Jean Delvare
On Wed, 14 Apr 2010 13:54:02 +0100 Alan Cox wrote:
> 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
depends on GPIOLIB
depends on INPUT
Does it build when CONFIG_PM is disabled?
> + help
> + Say Y here if you have a cy8ctmg110 touchscreen capacitive
> + touchscreen
drop first "touchscreen" and end with '.'.
> +
> + 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/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>
wow. Some of them are there 3 times. :(
> +
> +#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
> +
> +
> +/*HW definations*/
definitions
> +#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*/
definition
> +#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
better to use parens on expressions: (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
use parens. Oops, probably can't do that here, since:
+ y2 = (u16) (x * Y_SCALE_FACTOR);
you (== the code) want (x * 97) / 100.
Otherwise (with parens) it would be x * 0.
oh well.
> +
> +/* 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");
s/enabling/enable/
> +
> +
> +/*
> + * The touch position structure.
> + */
> +struct ts_event {
> + int x1;
> + int y1;
> + int x2;
> + int y2;
> + bool event_sended;
bool event_sent;
> +};
> +
> +/*
> + * 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");
Better to use DRIVER_NAME as prefix in messages.
> + 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
can be read
> + *
> + */
> +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,
> +};
---
~Randy
On Wed, 2010-04-14 at 13:54 +0100, Alan Cox wrote:
> 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)
Some more cleanups. Still not signed.
Cleanup includes
Cleanup typos
Remove a few used-once #defines
Cleanup logging
drivers/input/touchscreen/cy8ctmg110_ts.c | 145 ++++++++++++----------------
1 files changed, 62 insertions(+), 83 deletions(-)
diff --git a/drivers/input/touchscreen/cy8ctmg110_ts.c b/drivers/input/touchscreen/cy8ctmg110_ts.c
index 4adbe87..ea41f97 100644
--- a/drivers/input/touchscreen/cy8ctmg110_ts.c
+++ b/drivers/input/touchscreen/cy8ctmg110_ts.c
@@ -16,57 +16,48 @@
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#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/init.h>
#include <linux/device.h>
-#include <linux/module.h>
+#include <linux/miscdevice.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>
-
+#include <linux/io.h>
+#include <linux/ioctl.h>
+#include <linux/uaccess.h>
#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
-
-/*HW definations*/
+/* HW definitions */
#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_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
-
+#define CY8CTMG110_TOUCH_LENGTH 9787
+#define CY8CTMG110_SCREEN_LENGTH 8424
-/*Touch coordinates*/
+/* 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*/
+/* cy8ctmg110 registers definition */
#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
#define CY8CTMG110_TOUCH_SLEEP_TIME 2
#define CY8CTMG110_TOUCH_X1 3
@@ -77,21 +68,17 @@
#define CY8CTMG110_GESTURE 12
#define CY8CTMG110_REG_MAX 13
-#define CY8CTMG110_POLL_TIMER_DELAY 1000*1000*100
+#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;
+static int g_y_trace_coord;
module_param(g_y_trace_coord, int, 0600);
/* Polling mode */
-static int polling = 0;
+static int polling;
module_param(polling, int, 0);
-MODULE_PARM_DESC(polling, "Set to enabling polling of the touchscreen");
+MODULE_PARM_DESC(polling, "Set to enable polling of the touchscreen");
/*
@@ -102,7 +89,7 @@ struct ts_event {
int y1;
int x2;
int y2;
- bool event_sended;
+ bool event_sent;
};
/*
@@ -122,8 +109,8 @@ struct cy8ctmg110 {
};
/*
- * cy8ctmg110_poweroff is the routine that is called when touch hardware
- * will powered off
+ * cy8ctmg110_poweroff is the routine that is called
+ * when touch hardware will be powered off
*/
static void cy8ctmg110_power(bool poweron)
{
@@ -135,7 +122,6 @@ static void cy8ctmg110_power(bool poweron)
/*
* 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)
@@ -152,7 +138,7 @@ static int cy8ctmg110_write_req(struct cy8ctmg110 *tsc, unsigned char reg,
ret = i2c_transfer(client->adapter, msg, 1);
if (ret != 1) {
- printk("cy8ctmg110 touch : i2c write data cmd failed \n");
+ pr_err("i2c write data cmd failed\n");
return ret;
}
return 0;
@@ -160,9 +146,7 @@ static int cy8ctmg110_write_req(struct cy8ctmg110 *tsc, unsigned char reg,
/*
* 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)
{
@@ -208,23 +192,23 @@ static void cy8ctmg110_send_event(void *tsc)
x = ts->tc.x1;
y = ts->tc.y1;
- if (ts->tc.event_sended == false) {
+ if (!ts->tc.event_sent) {
input_report_key(input, BTN_TOUCH, 1);
ts->pending = true;
- x2 = (u16) (y * X_SCALE_FACTOR);
- y2 = (u16) (x * Y_SCALE_FACTOR);
+ x2 = (u16)(y * 9387 / 8424);
+ y2 = (u16)(x * 97 / 100);
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);
+ pr_info("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)
{
@@ -236,30 +220,29 @@ static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
/*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) {
+ if (tsc->pending) {
struct input_dev *input = tsc->input;
input_report_key(input, BTN_TOUCH, 0);
- tsc->tc.event_sended = true;
+ tsc->tc.event_sent = 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;
+ tsc->tc.event_sent = false;
cy8ctmg110_send_event(tsc);
}
return 0;
}
/*
- * if interrupt isn't in use the touch positions can reads by polling
- *
+ * if interrupt isn't in use the touch positions can be read by polling
*/
static enum hrtimer_restart cy8ctmg110_timer(struct hrtimer *handle)
{
@@ -270,7 +253,9 @@ static enum hrtimer_restart cy8ctmg110_timer(struct hrtimer *handle)
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);
+ hrtimer_start(&ts->timer,
+ ktime_set(0, CY8CTMG110_POLL_TIMER_DELAY),
+ HRTIMER_MODE_REL);
spin_unlock_irqrestore(&ts->lock, flags);
return HRTIMER_NORESTART;
@@ -278,13 +263,12 @@ static enum hrtimer_restart cy8ctmg110_timer(struct hrtimer *handle)
/*
* 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) {
+ if (ts->sleepmode) {
reg_p[0] = 0x00;
reg_p[1] = 0xff;
reg_p[2] = 5;
@@ -303,15 +287,13 @@ static bool cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts)
/*
* 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)
+ if (!tsc->initController) {
+ if (cy8ctmg110_set_sleepmode(tsc))
tsc->initController = true;
} else
cy8ctmg110_touch_pos(tsc);
@@ -322,8 +304,8 @@ static irqreturn_t cy8ctmg110_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
-
-static int cy8ctmg110_probe(struct i2c_client *client, const struct i2c_device_id *id)
+static int cy8ctmg110_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
{
struct cy8ctmg110 *ts;
struct input_dev *input_dev;
@@ -350,7 +332,7 @@ static int cy8ctmg110_probe(struct i2c_client *client, const struct i2c_device_i
ts->sleepmode = false;
snprintf(ts->phys, sizeof(ts->phys), "%s/input0",
- dev_name(&client->dev));
+ dev_name(&client->dev));
input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
input_dev->phys = ts->phys;
@@ -358,20 +340,22 @@ static int cy8ctmg110_probe(struct i2c_client *client, const struct i2c_device_i
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->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);
+ 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);
+ dev_err(&client->dev, "Unable to request GPIO pin %d\n",
+ CY8CTMG110_RESET_PIN_GPIO);
goto err_free_irq;
}
cy8ctmg110_power(true);
@@ -385,14 +369,14 @@ static int cy8ctmg110_probe(struct i2c_client *client, const struct i2c_device_i
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 */
+ /* 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);
+ "failed to request GPIO %d, error %d\n",
+ CY8CTMG110_IRQ_PIN_GPIO, err);
goto err_free_timer;
}
@@ -400,8 +384,8 @@ static int cy8ctmg110_probe(struct i2c_client *client, const struct i2c_device_i
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);
+ "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);
@@ -409,15 +393,16 @@ static int cy8ctmg110_probe(struct i2c_client *client, const struct i2c_device_i
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);
+ "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);
+ 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);
+ "cy8ctmg110 irq %d busy? error %d\n", client->irq, err);
goto err_free_gpio;
}
@@ -439,9 +424,7 @@ err_free_mem:
/*
* cy8ctmg110_suspend
- *
*/
-
static int cy8ctmg110_suspend(struct i2c_client *client, pm_message_t mesg)
{
if (device_may_wakeup(&client->dev))
@@ -451,10 +434,8 @@ static int cy8ctmg110_suspend(struct i2c_client *client, pm_message_t mesg)
}
/*
- * cy8ctmg110_resume
- *
+ * cy8ctmg110_resume
*/
-
static int cy8ctmg110_resume(struct i2c_client *client)
{
if (device_may_wakeup(&client->dev))
@@ -465,9 +446,7 @@ static int cy8ctmg110_resume(struct i2c_client *client)
/*
* cy8ctmg110_remove
- *
*/
-
static int cy8ctmg110_remove(struct i2c_client *client)
{
struct cy8ctmg110 *ts = i2c_get_clientdata(client);
On Wed, Apr 14, 2010 at 01:54:02PM +0100, Alan Cox wrote:
> 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) {
We set "event_sended" to false immediately before calling
cy8ctmg110_send_event() so I do not see the point of this flag.
> + 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);
Do we really need this? Seems to be early development diagnostic.
> + }
> +
> +}
> +
> +/*
> + * 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;
> + }
Just do input_report_key(input, BTN_TOUCH, 0); and let input core take
care of filtering duplicates. This will allow you get rid of bunch of
flags. Also input_sync() is missing here.
> + } 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);
> +
So device simply dies after so many errors?
> + spin_unlock_irqrestore(&ts->lock, flags);
The timer handler is the only user for the spinlock, what is the point?
> + return HRTIMER_NORESTART;
> +}
> +
> +/*
> + *
> + */
> +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);
Initalizing device from interrupt handler is quite novel concept...
> +
> + /* 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) |
You usually do not set up autorepeat for pointingt devices.
> + BIT_MASK(EV_REL) | BIT_MASK(EV_ABS);
The device does not emit relative events.
> + input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
> +
> + input_set_capability(input_dev, EV_KEY, KEY_F);
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);
> +
Polling mode shoudl be controlled by platform data, not kernel module I think.
> + /* 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)
> +{
Stop timer here? Also power down the device?
> + 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);
Implement close() method and move the code above there? Also do open().
> + 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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> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
Dmitry
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
>> + if (ts->tc.event_sended == false) {
>
> We set "event_sended" to false immediately before calling
> cy8ctmg110_send_event() so I do not see the point of this flag.
On that note:
$ git grep -n sended
drivers/net/eth16i.c:1295:
how many packets there is to be sended */
drivers/net/wan/sbni.c:638:
/* if frame was sended but not ACK'ed - resend it */
drivers/net/wan/sbni.c:659:
* frame sended then in prepare_to_send next frame
drivers/usb/serial/aircable.c:13:
* next two bytes must say how much data will be sended.
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On Thu, Apr 15, 2010 at 07:41:22PM -0400, Rafi Rubin wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> >> + if (ts->tc.event_sended == false) {
> >
> > We set "event_sended" to false immediately before calling
> > cy8ctmg110_send_event() so I do not see the point of this flag.
>
> On that note:
>
> $ git grep -n sended
> drivers/net/eth16i.c:1295:
> how many packets there is to be sended */
> drivers/net/wan/sbni.c:638:
> /* if frame was sended but not ACK'ed - resend it */
> drivers/net/wan/sbni.c:659:
> * frame sended then in prepare_to_send next frame
> drivers/usb/serial/aircable.c:13:
> * next two bytes must say how much data will be sended.
>
Well, if you want to go down that path...
[dtor@hammer work]$ grep -r -e "\(setted\|setuped\|split\+ed\)" . | wc -l
54
[dtor@hammer work]$
--
Dmitry