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author | Samuli Konttila <samuli.konttila@aavamobile.com> | 2010-07-30 18:02:43 +0200 |
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committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-07-31 11:37:17 +0200 |
commit | 60347c194acec7ff1b4291ac8e62a5345244c2ee (patch) | |
tree | 29f94dbc1dc2a950f6e1b6b03fab1ad2ed17eafa /drivers/input/touchscreen/cy8ctmg110_ts.c | |
parent | Input: keyboard - also match braille-only keyboards (diff) | |
download | linux-60347c194acec7ff1b4291ac8e62a5345244c2ee.tar.xz linux-60347c194acec7ff1b4291ac8e62a5345244c2ee.zip |
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>
Diffstat (limited to 'drivers/input/touchscreen/cy8ctmg110_ts.c')
-rw-r--r-- | drivers/input/touchscreen/cy8ctmg110_ts.c | 363 |
1 files changed, 363 insertions, 0 deletions
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"); |