From 7f90a049d8ddcb6c485e2a6889cb3b5d4a5be1c0 Mon Sep 17 00:00:00 2001 From: Nelson Castillo Date: Sat, 24 Oct 2009 03:04:40 -0500 Subject: Add s3c2410ts Add the ts and the relevant files. Signed-off-by: Nelson Castillo --- arch/arm/mach-s3c2410/include/mach/ts.h | 35 ++ arch/arm/plat-s3c/include/plat/devs.h | 2 + arch/arm/plat-s3c24xx/devs.c | 20 ++ drivers/input/touchscreen/Kconfig | 18 ++ drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/s3c2410_ts.c | 552 ++++++++++++++++++++++++++++++++ 6 files changed, 628 insertions(+) create mode 100644 arch/arm/mach-s3c2410/include/mach/ts.h create mode 100644 drivers/input/touchscreen/s3c2410_ts.c diff --git a/arch/arm/mach-s3c2410/include/mach/ts.h b/arch/arm/mach-s3c2410/include/mach/ts.h new file mode 100644 index 00000000000..ffd73d5bda2 --- /dev/null +++ b/arch/arm/mach-s3c2410/include/mach/ts.h @@ -0,0 +1,35 @@ +/* arch/arm/mach-s3c2410/include/mach/ts.h + * + * Copyright (c) 2005 Arnaud Patard + * + * + * 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. + * + * + * Changelog: + * 24-Mar-2005 RTP Created file + * 03-Aug-2005 RTP Renamed to ts.h + */ + +#ifndef __ASM_ARM_TS_H +#define __ASM_ARM_TS_H + +#include <../drivers/input/touchscreen/ts_filter.h> + +struct s3c2410_ts_mach_info { + /* Touchscreen delay. */ + int delay; + /* Prescaler value. */ + int presc; + /* + * Null-terminated array of pointers to filter APIs and configurations + * we want to use. In the same order they will be applied. + */ + const struct ts_filter_chain_configuration *filter_config; +}; + +void set_s3c2410ts_info(const struct s3c2410_ts_mach_info *hard_s3c2410ts_info); + +#endif /* __ASM_ARM_TS_H */ diff --git a/arch/arm/plat-s3c/include/plat/devs.h b/arch/arm/plat-s3c/include/plat/devs.h index 0f540ea1e99..50d50a2f086 100644 --- a/arch/arm/plat-s3c/include/plat/devs.h +++ b/arch/arm/plat-s3c/include/plat/devs.h @@ -53,6 +53,8 @@ extern struct platform_device s3c_device_nand; extern struct platform_device s3c_device_usbgadget; extern struct platform_device s3c_device_usb_hsotg; +extern struct platform_device s3c_device_ts; + /* s3c2440 specific devices */ #ifdef CONFIG_CPU_S3C2440 diff --git a/arch/arm/plat-s3c24xx/devs.c b/arch/arm/plat-s3c24xx/devs.c index f52a92ce8dd..9ef0e97d56e 100644 --- a/arch/arm/plat-s3c24xx/devs.c +++ b/arch/arm/plat-s3c24xx/devs.c @@ -30,6 +30,8 @@ #include #include +#include + #include #include @@ -182,6 +184,24 @@ void __init s3c24xx_fb_set_platdata(struct s3c2410fb_mach_info *pd) } } +/* Touchscreen */ + +struct platform_device s3c_device_ts = { + .name = "s3c2410-ts", + .id = -1, + .dev.parent = &s3c_device_adc.dev, +}; + +static struct s3c2410_ts_mach_info s3c2410ts_info; + +void set_s3c2410ts_info(const struct s3c2410_ts_mach_info *hard_s3c2410ts_info) +{ + memcpy(&s3c2410ts_info, hard_s3c2410ts_info, + sizeof(struct s3c2410_ts_mach_info)); + s3c_device_ts.dev.platform_data = &s3c2410ts_info; +} +EXPORT_SYMBOL(set_s3c2410ts_info); + /* USB Device (Gadget)*/ static struct resource s3c_usbgadget_resource[] = { diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index faf929e5454..835bb5172be 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -55,6 +55,24 @@ config TOUCHSCREEN_FILTER_LINEAR Say Y here if you want to use the Linear touchscreen filter, it enables the use of calibration data for the touchscreen. +config TOUCHSCREEN_S3C2410 + tristate "Samsung S3C2410 touchscreen input driver" + depends on ARCH_S3C2410 && INPUT && INPUT_TOUCHSCREEN + select SERIO + help + Say Y here if you have the s3c2410 touchscreen. + + If unsure, say N. + + To compile this driver as a module, choose M here: the + module will be called s3c2410_ts. + +config TOUCHSCREEN_S3C2410_DEBUG + boolean "Samsung S3C2410 touchscreen debug messages" + depends on TOUCHSCREEN_S3C2410 + help + Select this if you want debug messages + config TOUCHSCREEN_ADS7846 tristate "ADS7846/TSC2046 and ADS7843 based touchscreens" depends on SPI_MASTER diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 322df12bb30..453477fe012 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -47,3 +47,4 @@ obj-$(CONFIG_TOUCHSCREEN_FILTER_GROUP) += ts_filter_group.o obj-$(CONFIG_TOUCHSCREEN_FILTER_LINEAR) += ts_filter_linear.o obj-$(CONFIG_TOUCHSCREEN_FILTER_MEDIAN) += ts_filter_median.o obj-$(CONFIG_TOUCHSCREEN_FILTER_MEAN) += ts_filter_mean.o +obj-$(CONFIG_TOUCHSCREEN_S3C2410) += s3c2410_ts.o diff --git a/drivers/input/touchscreen/s3c2410_ts.c b/drivers/input/touchscreen/s3c2410_ts.c new file mode 100644 index 00000000000..caccc83cd12 --- /dev/null +++ b/drivers/input/touchscreen/s3c2410_ts.c @@ -0,0 +1,552 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Copyright (c) 2004 Arnaud Patard + * iPAQ H1940 touchscreen support + * + * ChangeLog + * + * 2004-09-05: Herbert Pötzl + * - Added clock (de-)allocation code + * + * 2005-03-06: Arnaud Patard + * - h1940_ -> s3c2410 (this driver is now also used on the n30 + * machines :P) + * - Debug messages are now enabled with the config option + * TOUCHSCREEN_S3C2410_DEBUG + * - Changed the way the value are read + * - Input subsystem should now work + * - Use ioremap and readl/writel + * + * 2005-03-23: Arnaud Patard + * - Make use of some undocumented features of the touchscreen + * controller + * + * 2007-05-23: Harald Welte + * - Add proper support for S32440 + * + * 2008-06-23: Andy Green + * - Removed averaging system + * - Added generic Touchscreen filter stuff + * + * 2008-11-27: Nelson Castillo + * - Improve interrupt handling + * + * 2009-04-09: Nelson Castillo + * - Use s3c-adc API (Vasily Khoruzhick provided + * a working example for a simpler version of this driver). + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "ts_filter_chain.h" + +/* For ts.dev.id.version */ +#define S3C2410TSVERSION 0x0101 + +#define WAIT4INT(x) (((x)<<8) | \ + S3C2410_ADCTSC_YM_SEN | \ + S3C2410_ADCTSC_YP_SEN | \ + S3C2410_ADCTSC_XP_SEN | \ + S3C2410_ADCTSC_XY_PST(3)) + +#define TSPRINTK(fmt, args...) \ + printk(KERN_DEBUG "%s: " fmt, __func__ , ## args) +#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG +# define DPRINTK TSPRINTK +#else +# define DPRINTK(fmt, args...) +#endif + + +MODULE_AUTHOR("Arnaud Patard "); +MODULE_DESCRIPTION("s3c2410 touchscreen driver"); +MODULE_LICENSE("GPL"); + +/* + * Definitions & global arrays. + */ + +static char *s3c2410ts_name = "s3c2410 TouchScreen"; + +#define TS_RELEASE_TIMEOUT (HZ >> 7 ? HZ >> 7 : 1) /* 8ms (5ms if HZ is 200) */ +#define TS_EVENT_FIFO_SIZE (2 << 6) /* Must be a power of 2. */ + +/* + * Per-touchscreen data. + */ + +enum ts_state {TS_STATE_STANDBY, TS_STATE_PRESSED, TS_STATE_RELEASE_PENDING, + TS_STATE_RELEASE}; + +struct s3c2410ts { + struct input_dev *dev; + struct ts_filter_chain *chain; + enum ts_state state; + int is_down; + struct kfifo *event_fifo; + struct s3c_adc_client *adc_client; + unsigned adc_selected; +}; + +static struct s3c2410ts ts; + +static void __iomem *base_addr; + +/* + * A few low level functions. + */ + +static inline void s3c2410_ts_connect(void) +{ + s3c2410_gpio_cfgpin(S3C2410_GPG(12), S3C2410_GPG12_XMON); + s3c2410_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPG13_nXPON); + s3c2410_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPG14_YMON); + s3c2410_gpio_cfgpin(S3C2410_GPG(15), S3C2410_GPG15_nYPON); +} + +/* + * Code that starts ADC conversions. + */ + +static void ts_adc_timer_f(unsigned long data); +static struct timer_list ts_adc_timer = TIMER_INITIALIZER(ts_adc_timer_f, 0, 0); + +static void ts_adc_timer_f(unsigned long data) +{ + if (s3c_adc_start(ts.adc_client, 0, 1)) + mod_timer(&ts_adc_timer, jiffies + 1); +} + +static void s3c2410_ts_start_adc_conversion(void) +{ + if (ts.adc_selected) + mod_timer(&ts_adc_timer, jiffies + 1); + else + ts_adc_timer_f(0); +} + +/* Callback for the s3c-adc API. */ +void adc_selected_f(unsigned selected) +{ + ts.adc_selected = selected; +} + +/* + * Just send the input events. + */ + +enum ts_input_event {IE_DOWN = 0, IE_UP}; + +static void ts_input_report(int event, int coords[]) +{ +#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG + static char *s[] = {"down", "up"}; + struct timeval tv; + + do_gettimeofday(&tv); +#endif + + if (event == IE_DOWN) { + input_report_abs(ts.dev, ABS_X, coords[0]); + input_report_abs(ts.dev, ABS_Y, coords[1]); + input_report_key(ts.dev, BTN_TOUCH, 1); + input_report_abs(ts.dev, ABS_PRESSURE, 1); + + DPRINTK("T:%06d %6s (X:%03d, Y:%03d)\n", + (int)tv.tv_usec, s[event], coords[0], coords[1]); + } else { + input_report_key(ts.dev, BTN_TOUCH, 0); + input_report_abs(ts.dev, ABS_PRESSURE, 0); + + DPRINTK("T:%06d %6s\n", + (int)tv.tv_usec, s[event]); + } + + input_sync(ts.dev); +} + +/* + * Manage the state of the touchscreen. + */ + +static void event_send_timer_f(unsigned long data); + +static struct timer_list event_send_timer = + TIMER_INITIALIZER(event_send_timer_f, 0, 0); + +static void event_send_timer_f(unsigned long data) +{ + static int noop_counter; + int event_type; + + while (__kfifo_get(ts.event_fifo, (unsigned char *)&event_type, + sizeof(int))) { + int buf[2]; + + switch (event_type) { + case 'D': + if (ts.state == TS_STATE_RELEASE_PENDING) + /* Ignore short UP event. */ + ts.state = TS_STATE_PRESSED; + break; + + case 'U': + ts.state = TS_STATE_RELEASE_PENDING; + break; + + case 'P': + if (ts.is_down) /* Stylus_action needs a conversion. */ + s3c2410_ts_start_adc_conversion(); + + if (unlikely(__kfifo_get(ts.event_fifo, + (unsigned char *)buf, + sizeof(int) * 2) + != sizeof(int) * 2)) { + /* This will only happen if we have a bug. */ + TSPRINTK("Invalid packet\n"); + return; + } + + ts_input_report(IE_DOWN, buf); + ts.state = TS_STATE_PRESSED; + break; + } + + noop_counter = 0; + } + + if (noop_counter++ >= 1) { + noop_counter = 0; + if (ts.state == TS_STATE_RELEASE_PENDING) { + /* + * We delay the UP event for a while to avoid jitter. + * If we get a DOWN event we do not send it. + */ + ts_input_report(IE_UP, NULL); + ts.state = TS_STATE_STANDBY; + + ts_filter_chain_clear(ts.chain); + } + } else { + mod_timer(&event_send_timer, jiffies + TS_RELEASE_TIMEOUT); + } +} + +/* + * Manage interrupts. + */ + +static irqreturn_t stylus_updown(int irq, void *dev_id) +{ + unsigned long data0; + unsigned long data1; + int event_type; + + data0 = readl(base_addr + S3C2410_ADCDAT0); + data1 = readl(base_addr + S3C2410_ADCDAT1); + + ts.is_down = !(data0 & S3C2410_ADCDAT0_UPDOWN) && + !(data1 & S3C2410_ADCDAT0_UPDOWN); + + event_type = ts.is_down ? 'D' : 'U'; + + if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)&event_type, + sizeof(int)) != sizeof(int))) + /* Only happens if we have a bug. */ + TSPRINTK("FIFO full\n"); + + if (ts.is_down) + s3c2410_ts_start_adc_conversion(); + else + writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC); + + mod_timer(&event_send_timer, jiffies + 1); + + return IRQ_HANDLED; +} + +static void stylus_adc_action(unsigned p0, unsigned p1, unsigned *conv_left) +{ + int buf[3]; + + /* TODO: Do we really need this? */ + if (p0 & S3C2410_ADCDAT0_AUTO_PST || + p1 & S3C2410_ADCDAT1_AUTO_PST) { + *conv_left = 1; + return; + } + + buf[1] = p0; + buf[2] = p1; + + switch (ts_filter_chain_feed(ts.chain, &buf[1])) { + case 0: + /* The filter wants more points. */ + *conv_left = 1; + return; + case 1: + /* We have a point from the filters or no filtering enabled. */ + buf[0] = 'P'; + break; + default: + TSPRINTK("invalid return value\n"); + case -1: + /* Too much noise. Ignore the event. */ + ts_filter_chain_clear(ts.chain); + writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC); + return; + }; + + if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)buf, + sizeof(int) * 3) != sizeof(int) * 3)) + /* This will only happen if we have a bug. */ + TSPRINTK("FIFO full\n"); + + writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC); + mod_timer(&event_send_timer, jiffies + 1); + + return; +} + +/* + * The functions for inserting/removing us as a module. + */ + +static int __init s3c2410ts_probe(struct platform_device *pdev) +{ + int rc; + struct s3c2410_ts_mach_info *info; + struct input_dev *input_dev; + int ret = 0; + + dev_info(&pdev->dev, "Starting\n"); + + info = (struct s3c2410_ts_mach_info *)pdev->dev.platform_data; + + if (!info) { + dev_err(&pdev->dev, "No platform data\n"); + return -EINVAL; + } + + base_addr = ioremap(S3C2410_PA_ADC, 0x20); + if (base_addr == NULL) { + dev_err(&pdev->dev, "Failed to remap register block\n"); + ret = -ENOMEM; + goto bail0; + } + + /* If we acutally are a S3C2410: Configure GPIOs */ + if (!strcmp(pdev->name, "s3c2410-ts")) + s3c2410_ts_connect(); + + writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC); + + /* Initialise input stuff */ + memset(&ts, 0, sizeof(struct s3c2410ts)); + + ts.adc_client = + s3c_adc_register(pdev, adc_selected_f, stylus_adc_action, 1); + if (!ts.adc_client) { + dev_err(&pdev->dev, + "Unable to register s3c2410_ts as s3_adc client\n"); + iounmap(base_addr); + ret = -EIO; + goto bail0; + } + + input_dev = input_allocate_device(); + if (!input_dev) { + dev_err(&pdev->dev, "Unable to allocate the input device\n"); + ret = -ENOMEM; + goto bail1; + } + + ts.dev = input_dev; + ts.dev->evbit[0] = BIT_MASK(EV_SYN) | BIT_MASK(EV_KEY) | + BIT_MASK(EV_ABS); + ts.dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); + input_set_abs_params(ts.dev, ABS_X, 0, 0x3FF, 0, 0); + input_set_abs_params(ts.dev, ABS_Y, 0, 0x3FF, 0, 0); + input_set_abs_params(ts.dev, ABS_PRESSURE, 0, 1, 0, 0); + + ts.dev->name = s3c2410ts_name; + ts.dev->id.bustype = BUS_RS232; + ts.dev->id.vendor = 0xDEAD; + ts.dev->id.product = 0xBEEF; + ts.dev->id.version = S3C2410TSVERSION; + ts.state = TS_STATE_STANDBY; + ts.event_fifo = kfifo_alloc(TS_EVENT_FIFO_SIZE, GFP_KERNEL, NULL); + if (IS_ERR(ts.event_fifo)) { + ret = -EIO; + goto bail2; + } + + /* Create the filter chain set up for the 2 coordinates we produce. */ + ts.chain = ts_filter_chain_create(pdev, info->filter_config, 2); + + if (IS_ERR(ts.chain)) + goto bail2; + + ts_filter_chain_clear(ts.chain); + + /* Get IRQ. */ + if (request_irq(IRQ_TC, stylus_updown, 0, "s3c2410_action", ts.dev)) { + dev_err(&pdev->dev, "Could not allocate ts IRQ_TC !\n"); + iounmap(base_addr); + ret = -EIO; + goto bail3; + } + + dev_info(&pdev->dev, "Successfully loaded\n"); + + /* All went ok. Register to the input system. */ + rc = input_register_device(ts.dev); + if (rc) { + dev_info(&pdev->dev, "Could not register input device\n"); + ret = -EIO; + goto bail4; + } + + return 0; + +bail4: + free_irq(IRQ_TC, ts.dev); + iounmap(base_addr); + disable_irq(IRQ_TC); +bail3: + ts_filter_chain_destroy(ts.chain); + kfifo_free(ts.event_fifo); +bail2: + input_unregister_device(ts.dev); +bail1: + iounmap(base_addr); +bail0: + + return ret; +} + +static int s3c2410ts_remove(struct platform_device *pdev) +{ + disable_irq(IRQ_TC); + free_irq(IRQ_TC, ts.dev); + + s3c_adc_release(ts.adc_client); + input_unregister_device(ts.dev); + iounmap(base_addr); + + ts_filter_chain_destroy(ts.chain); + + kfifo_free(ts.event_fifo); + + return 0; +} + +#ifdef CONFIG_PM + +#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE | \ + S3C2410_ADCTSC_XY_PST(0)) + +static int s3c2410ts_suspend(struct platform_device *pdev, pm_message_t state) +{ + writel(TSC_SLEEP, base_addr + S3C2410_ADCTSC); + writel(readl(base_addr + S3C2410_ADCCON) | S3C2410_ADCCON_STDBM, + base_addr + S3C2410_ADCCON); + disable_irq(IRQ_TC); + + return 0; +} + +static int s3c2410ts_resume(struct platform_device *pdev) +{ + ts_filter_chain_clear(ts.chain); + enable_irq(IRQ_TC); + writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC); + + return 0; +} + +#else +#define s3c2410ts_suspend NULL +#define s3c2410ts_resume NULL +#endif + +static struct platform_driver s3c2410ts_driver = { + .driver = { + .name = "s3c2410-ts", + .owner = THIS_MODULE, + }, + .probe = s3c2410ts_probe, + .remove = s3c2410ts_remove, + .suspend = s3c2410ts_suspend, + .resume = s3c2410ts_resume, +}; + +static struct platform_driver s3c2440ts_driver = { + .driver = { + .name = "s3c2440-ts", + .owner = THIS_MODULE, + }, + .probe = s3c2410ts_probe, + .remove = s3c2410ts_remove, + .suspend = s3c2410ts_suspend, + .resume = s3c2410ts_resume, +}; + +static int __init s3c2410ts_init(void) +{ + int rc; + + rc = platform_driver_register(&s3c2410ts_driver); + if (rc < 0) + return rc; + + rc = platform_driver_register(&s3c2440ts_driver); + if (rc < 0) + platform_driver_unregister(&s3c2410ts_driver); + + return rc; +} + +static void __exit s3c2410ts_exit(void) +{ + platform_driver_unregister(&s3c2440ts_driver); + platform_driver_unregister(&s3c2410ts_driver); +} + +module_init(s3c2410ts_init); +module_exit(s3c2410ts_exit); + -- cgit v1.2.3