Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755234AbYLBNjb (ORCPT ); Tue, 2 Dec 2008 08:39:31 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754836AbYLBNjJ (ORCPT ); Tue, 2 Dec 2008 08:39:09 -0500 Received: from fg-out-1718.google.com ([72.14.220.158]:36401 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754223AbYLBNjF (ORCPT ); Tue, 2 Dec 2008 08:39:05 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:mime-version:content-type :content-transfer-encoding:content-disposition; b=oWVVl7qY5bv5jAHZeMBjD3qNW3QyHNEY2xWlpkySAkNRpg7SrZnJYoKxzmFrqaUzH7 6iLbNIc5yc28+lJ9dmULnI8UhAqdKajTTMT78hBYvoCTeuCcwTFtu5gZZjzzJcLY+z4P wElYC+AoK/x2veewoR3iwz861ITkpoKsPN9e8= Message-ID: <483a38b80812020539v2323a784h7f202749687764db@mail.gmail.com> Date: Tue, 2 Dec 2008 22:39:03 +0900 From: "Kwangwoo Lee" To: dmitry.torokhov@gmail.com Subject: [PATCH] Add tsc2007 based touchscreen driver. Cc: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 14080 Lines: 549 Hello, I'm newbie and I tested this driver on my ARM9 based SoC - MV86XX. But the platform codes are not submitted yet. The example of platform specific codes are followed: /* TSC2007 Touchscreen */ #ifdef CONFIG_LCD_CT024TN02 /* GPIO13:GINT3 = PENIRQ */ #define TS_PENIRQ_GPIO GPIO13 #define TS_CHAINED_GPIO 3 #else /* GPIO5:GINT1 = PENIRQ */ #define TS_PENIRQ_GPIO GPIO5 #define TS_CHAINED_GPIO 1 #endif static int mv_get_pendown_state(void) { int val = 0; mv_gpio_set_direction(TS_PENIRQ_GPIO, 0); mv_gpio_mux_ctrl(TS_PENIRQ_GPIO, GPIO_PIN_MODE_GPIO); val = mv_gpio_get_value(TS_PENIRQ_GPIO); mv_gpio_mux_ctrl(TS_PENIRQ_GPIO, GPIO_PIN_MODE_INT); val = val ? 0 : 1; return val; } static void mv_clear_penirq(void) { mv_gpio_int_clear(TS_CHAINED_GPIO); } static int mv_init_ts(void) { mv_gpio_set_direction(TS_PENIRQ_GPIO, 0); /* input */ mv_gpio_mux_ctrl(TS_PENIRQ_GPIO, GPIO_PIN_MODE_INT); mv_gpio_int_mode(TS_CHAINED_GPIO, GPIO_INT_FALLING_EDGE); mv_gpio_int_clear(TS_CHAINED_GPIO); mv_gpio_int_unmask(TS_CHAINED_GPIO); return 0; } static void mv_exit_ts(void) { mv_gpio_mux_ctrl(TS_PENIRQ_GPIO, GPIO_PIN_MODE_GPIO); mv_gpio_int_mask(TS_CHAINED_GPIO); } struct tsc2007_platform_data mv_tsc2007_data = { .model = 2007, .x_plate_ohms = 180, .get_pendown_state = mv_get_pendown_state, .clear_penirq = mv_clear_penirq, .init_platform_hw = mv_init_ts, .exit_platform_hw = mv_exit_ts, }; /* I2C clients */ static struct i2c_board_info __initdata mv_i2c_clients[] = { [0] = { I2C_BOARD_INFO("tsc2007", 0x90), .type = "tsc2007", .platform_data = &mv_tsc2007_data, .irq = IRQ_GPIO, }, }; i2c_register_board_info() should be used. Signed-off-by: Kwangwoo Lee --- drivers/input/touchscreen/Kconfig | 9 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/tsc2007.c | 398 +++++++++++++++++++++++++++++++++++ include/linux/i2c/tsc2007.h | 17 ++ 4 files changed, 425 insertions(+), 0 deletions(-) create mode 100644 drivers/input/touchscreen/tsc2007.c create mode 100644 include/linux/i2c/tsc2007.h diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 3d1ab8f..78abdfb 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -376,4 +376,13 @@ config TOUCHSCREEN_TOUCHIT213 To compile this driver as a module, choose M here: the module will be called touchit213. +config TOUCHSCREEN_TSC2007 + tristate "TSC2007 based touchscreens" + depends on I2C + help + Say Y here if you have a TSC2007 based touchscreens. + + To compile this driver as a module, choose M here: the + module will be called tsc2007. + endif diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 15cf290..824999c 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -31,3 +31,4 @@ wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9705) += wm9705.o wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9712) += wm9712.o wm97xx-ts-$(CONFIG_TOUCHSCREEN_WM9713) += wm9713.o obj-$(CONFIG_TOUCHSCREEN_WM97XX_MAINSTONE) += mainstone-wm97xx.o +obj-$(CONFIG_TOUCHSCREEN_TSC2007) += tsc2007.o diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c new file mode 100644 index 0000000..85fb520 --- /dev/null +++ b/drivers/input/touchscreen/tsc2007.c @@ -0,0 +1,398 @@ +/* + * drivers/input/touchscreen/tsc2007.c + * + * Copyright (c) 2008 MtekVision Co., Ltd. + * Kwangwoo Lee + * + * Using code from: + * - ads7846.c + * Copyright (c) 2005 David Brownell + * Copyright (c) 2006 Nokia Corporation + * - corgi_ts.c + * Copyright (C) 2004-2005 Richard Purdie + * - omap_ts.[hc], ads7846.h, ts_osk.c + * Copyright (C) 2002 MontaVista Software + * Copyright (C) 2004 Texas Instruments + * Copyright (C) 2005 Dirk Behme + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define TS_POLL_DELAY (10 * 1000) /* ns delay before the first sample */ +#define TS_POLL_PERIOD (5 * 1000) /* ns delay between samples */ + +#define TSC2007_MEASURE_TEMP0 (0x0 << 4) +#define TSC2007_MEASURE_AUX (0x2 << 4) +#define TSC2007_MEASURE_TEMP1 (0x4 << 4) +#define TSC2007_ACTIVATE_XN (0x8 << 4) +#define TSC2007_ACTIVATE_YN (0x9 << 4) +#define TSC2007_ACTIVATE_YP_XN (0xa << 4) +#define TSC2007_SETUP (0xb << 4) +#define TSC2007_MEASURE_X (0xc << 4) +#define TSC2007_MEASURE_Y (0xd << 4) +#define TSC2007_MEASURE_Z1 (0xe << 4) +#define TSC2007_MEASURE_Z2 (0xf << 4) + +#define TSC2007_POWER_OFF_IRQ_EN (0x0 << 2) +#define TSC2007_ADC_ON_IRQ_DIS0 (0x1 << 2) +#define TSC2007_ADC_OFF_IRQ_EN (0x2 << 2) +#define TSC2007_ADC_ON_IRQ_DIS1 (0x3 << 2) + +#define TSC2007_12BIT (0x0 << 1) +#define TSC2007_8BIT (0x1 << 1) + +#define MAX_12BIT ((1 << 12) - 1) + +#define ADC_ON_12BIT (TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0) + +#define READ_Y (ADC_ON_12BIT | TSC2007_MEASURE_Y) +#define READ_Z1 (ADC_ON_12BIT | TSC2007_MEASURE_Z1) +#define READ_Z2 (ADC_ON_12BIT | TSC2007_MEASURE_Z2) +#define READ_X (ADC_ON_12BIT | TSC2007_MEASURE_X) +#define PWRDOWN (TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN) + +struct ts_event { + u16 x; + u16 y; + u16 z1, z2; +}; + +struct tsc2007 { + struct input_dev *input; + char phys[32]; + struct hrtimer timer; + struct ts_event tc; + + struct i2c_client *client; + + spinlock_t lock; + + u16 model; + u16 x_plate_ohms; + + unsigned pendown; + int irq; + + int (*get_pendown_state)(void); + void (*clear_penirq)(void); +}; + +static int tsc2007_xfer(void *tsc, unsigned char cmd) +{ + struct tsc2007 *ts = tsc; + struct i2c_client *client = ts->client; + + unsigned char rbuf[2]; + unsigned short val; + int result; + + result = i2c_master_send(client, &cmd, 1); + if (result != 1) { + dev_err(&client->dev, "send failed, cmd 0x%x\n", cmd); + goto cmd_fail; + } + + result = i2c_master_recv(client, rbuf, 2); + if (result != 2) { + dev_err(&client->dev, "recv failed, cmd 0x%x\n", cmd); + goto cmd_fail; + } + + rbuf[1] = (rbuf[1] >> 4) | ((rbuf[0] & 0x0f) << 4); + rbuf[0] = rbuf[0] >> 4; + + val = *((unsigned short *) rbuf); + val = be16_to_cpu(val); + + dev_dbg(&client->dev, "cmd [0x%x], rbuf [0x%x, 0x%x] => val [%u]\n", + cmd, rbuf[0], rbuf[1], val); + + return (int) val; + +cmd_fail: + return -EIO; +} + +static void tsc2007_send_event(void *tsc) +{ + struct tsc2007 *ts = tsc; + u32 Rt; + u16 x, y, z1, z2; + + x = ts->tc.x; + y = ts->tc.y; + z1 = ts->tc.z1; + z2 = ts->tc.z2; + + /* range filtering */ + if (x == MAX_12BIT) + x = 0; + + if (likely(x && z1)) { + /* compute touch pressure resistance using equation #1 */ + Rt = z2; + Rt -= z1; + Rt *= x; + Rt *= ts->x_plate_ohms; + Rt /= z1; + Rt = (Rt + 2047) >> 12; + } else + Rt = 0; + + /* Sample found inconsistent by debouncing or pressure is beyond + * the maximum. Don't report it to user space, repeat at least + * once more the measurement + */ + if (Rt > MAX_12BIT) { + dev_dbg(&ts->client->dev, "ignored pressure %d\n", Rt); + + hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), + HRTIMER_MODE_REL); + return; + } + + /* NOTE: We can't rely on the pressure to determine the pen down + * state, even this controller has a pressure sensor. The pressure + * value can fluctuate for quite a while after lifting the pen and + * in some cases may not even settle at the expected value. + * + * The only safe way to check for the pen up condition is in the + * timer by reading the pen signal state (it's a GPIO _and_ IRQ). + */ + if (Rt) { + struct input_dev *input = ts->input; + + if (!ts->pendown) { + dev_dbg(&ts->client->dev, "DOWN\n"); + + input_report_key(input, BTN_TOUCH, 1); + ts->pendown = 1; + } + + input_report_abs(input, ABS_X, x); + input_report_abs(input, ABS_Y, y); + input_report_abs(input, ABS_PRESSURE, Rt); + + input_sync(input); + + dev_dbg(&ts->client->dev, "point(%4d,%4d), pressure (%4u)\n", + x, y, Rt); + } + + hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD), + HRTIMER_MODE_REL); +} + +static int tsc2007_read_values(struct tsc2007 *tsc) +{ + struct tsc2007 *ts = tsc; + + /* y- still on; turn on only y+ (and ADC) */ + ts->tc.y = tsc2007_xfer(ts, READ_Y); + + /* turn y- off, x+ on, then leave in lowpower */ + ts->tc.x = tsc2007_xfer(ts, READ_X); + + /* turn y+ off, x- on; we'll use formula #1 */ + ts->tc.z1 = tsc2007_xfer(ts, READ_Z1); + ts->tc.z2 = tsc2007_xfer(ts, READ_Z2); + + /* power down */ + tsc2007_xfer(ts, PWRDOWN); + return 0; +} + +static enum hrtimer_restart tsc2007_timer(struct hrtimer *handle) +{ + struct tsc2007 *ts = container_of(handle, struct tsc2007, timer); + + spin_lock_irq(&ts->lock); + + if (unlikely(!ts->get_pendown_state() && ts->pendown)) { + struct input_dev *input = ts->input; + + dev_dbg(&ts->client->dev, "UP\n"); + + input_report_key(input, BTN_TOUCH, 0); + input_report_abs(input, ABS_PRESSURE, 0); + input_sync(input); + + ts->pendown = 0; + enable_irq(ts->irq); + } else { + /* pen is still down, continue with the measurement */ + dev_dbg(&ts->client->dev, "pen is still down\n"); + + tsc2007_read_values(ts); + tsc2007_send_event(ts); + } + + spin_unlock_irq(&ts->lock); + return HRTIMER_NORESTART; +} + +static irqreturn_t tsc2007_irq(int irq, void *handle) +{ + struct tsc2007 *ts = handle; + unsigned long flags; + + spin_lock_irqsave(&ts->lock, flags); + if (likely(ts->get_pendown_state())) { + disable_irq(ts->irq); + hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY), + HRTIMER_MODE_REL); + } + + if (ts->clear_penirq) + ts->clear_penirq(); + + spin_unlock_irqrestore(&ts->lock, flags); + + return IRQ_HANDLED; +} + +static int tsc2007_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + struct tsc2007 *ts; + struct tsc2007_platform_data *pdata; + struct input_dev *input_dev; + int err; + + pdata = client->dev.platform_data; + if (pdata == NULL) { + dev_err(&client->dev, "platform data is required!\n"); + return -EINVAL; + } + + if (!i2c_check_functionality(adapter, + I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) + return -EIO; + + ts = kzalloc(sizeof(struct tsc2007), 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; + + hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + ts->timer.function = tsc2007_timer; + + spin_lock_init(&ts->lock); + + ts->model = pdata->model; + ts->x_plate_ohms = pdata->x_plate_ohms; + ts->get_pendown_state = pdata->get_pendown_state; + ts->clear_penirq = pdata->clear_penirq; + + pdata->init_platform_hw(); + + snprintf(ts->phys, sizeof(ts->phys), "%s/input0", client->dev.bus_id); + + input_dev->name = "TSC2007 Touchscreen"; + input_dev->phys = ts->phys; + + 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, 0, MAX_12BIT, 0, 0); + input_set_abs_params(input_dev, ABS_Y, 0, MAX_12BIT, 0, 0); + input_set_abs_params(input_dev, ABS_PRESSURE, 0, MAX_12BIT, 0, 0); + + tsc2007_read_values(ts); + + ts->irq = client->irq; + if (request_irq(ts->irq, tsc2007_irq, 0, + client->dev.driver->name, ts)) { + dev_err(&client->dev, "irq %d busy?\n", ts->irq); + err = -EBUSY; + goto err_free_mem; + } + + err = input_register_device(input_dev); + if (err) + goto err_free_irq; + + dev_info(&client->dev, "registered with irq (%d)\n", ts->irq); + + return 0; + + err_free_irq: + free_irq(ts->irq, ts); + err_free_mem: + input_free_device(input_dev); + kfree(ts); + return err; +} + +static int tsc2007_remove(struct i2c_client *client) +{ + struct tsc2007 *ts = i2c_get_clientdata(client); + struct tsc2007_platform_data *pdata; + + pdata = client->dev.platform_data; + pdata->exit_platform_hw(); + + input_unregister_device(ts->input); + free_irq(ts->irq, ts); + kfree(ts); + + dev_info(&client->dev, "unregistered\n"); + return 0; +} + +static struct i2c_device_id tsc2007_idtable[] = { + { "tsc2007", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(i2c, tsc2007_idtable); + +static struct i2c_driver tsc2007_driver = { + .driver = { + .owner = THIS_MODULE, + .name = "tsc2007" + }, + .id_table = tsc2007_idtable, + .probe = tsc2007_probe, + .remove = tsc2007_remove, +}; + +static int __init tsc2007_init(void) +{ + return i2c_add_driver(&tsc2007_driver); +} + +static void __exit tsc2007_exit(void) +{ + i2c_del_driver(&tsc2007_driver); +} + +module_init(tsc2007_init); +module_exit(tsc2007_exit); + +MODULE_AUTHOR("Kwangwoo Lee "); +MODULE_DESCRIPTION("TSC2007 TouchScreen Driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/i2c/tsc2007.h b/include/linux/i2c/tsc2007.h new file mode 100644 index 0000000..c6361fb --- /dev/null +++ b/include/linux/i2c/tsc2007.h @@ -0,0 +1,17 @@ +#ifndef __LINUX_I2C_TSC2007_H +#define __LINUX_I2C_TSC2007_H + +/* linux/i2c/tsc2007.h */ + +struct tsc2007_platform_data { + u16 model; /* 2007. */ + u16 x_plate_ohms; + + int (*get_pendown_state)(void); + void (*clear_penirq)(void); /* If needed, clear 2nd level + interrupt source */ + int (*init_platform_hw)(void); + void (*exit_platform_hw)(void); +}; + +#endif -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/