From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755476Ab0DNN0k (ORCPT ); Wed, 14 Apr 2010 09:26:40 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:34991 "EHLO bob.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750939Ab0DNN0h (ORCPT ); Wed, 14 Apr 2010 09:26:37 -0400 From: Alan Cox To: linux-i2c@vger.kernel.org, khali@linux-fr.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 14 Apr 2010 13:54:02 +0100 Message-ID: <20100414125234.23507.42816.stgit@localhost.localdomain> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Subject: [FOR COMMENT] cy8ctmg110 for review From: Samuli Konttila 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + + +#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 "); +MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver"); +MODULE_LICENSE("GPL v2");