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Diffstat (limited to 'target/linux/s3c24xx/files-2.6.30/drivers/input/touchscreen/s3c2410_ts.c')
-rw-r--r--target/linux/s3c24xx/files-2.6.30/drivers/input/touchscreen/s3c2410_ts.c593
1 files changed, 593 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/files-2.6.30/drivers/input/touchscreen/s3c2410_ts.c b/target/linux/s3c24xx/files-2.6.30/drivers/input/touchscreen/s3c2410_ts.c
new file mode 100644
index 000000000..93163ff50
--- /dev/null
+++ b/target/linux/s3c24xx/files-2.6.30/drivers/input/touchscreen/s3c2410_ts.c
@@ -0,0 +1,593 @@
+/*
+ * 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 <arnaud.patard@rtp-net.org>
+ * iPAQ H1940 touchscreen support
+ *
+ * ChangeLog
+ *
+ * 2004-09-05: Herbert Pötzl <herbert@13thfloor.at>
+ * - added clock (de-)allocation code
+ *
+ * 2005-03-06: Arnaud Patard <arnaud.patard@rtp-net.org>
+ * - 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 <arnaud.patard@rtp-net.org>
+ * - Make use of some undocumented features of the touchscreen
+ * controller
+ *
+ * 2007-05-23: Harald Welte <laforge@openmoko.org>
+ * - Add proper support for S32440
+ *
+ * 2008-06-23: Andy Green <andy@openmoko.com>
+ * - removed averaging system
+ * - added generic Touchscreen filter stuff
+ *
+ * 2008-11-27: Nelson Castillo <arhuaco@freaks-unidos.net>
+ * - improve interrupt handling
+ */
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/input.h>
+#include <linux/init.h>
+#include <linux/serio.h>
+#include <linux/timer.h>
+#include <linux/kfifo.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+#include <mach/regs-gpio.h>
+#include <mach/ts.h>
+#include <mach/hardware.h>
+#include <plat/regs-adc.h>
+
+#include <linux/touchscreen/ts_filter_chain.h>
+
+/* For ts.dev.id.version */
+#define S3C2410TSVERSION 0x0101
+
+#define TSC_SLEEP (S3C2410_ADCTSC_PULL_UP_DISABLE | S3C2410_ADCTSC_XY_PST(0))
+
+#define WAIT4INT(x) (((x)<<8) | \
+ S3C2410_ADCTSC_YM_SEN | \
+ S3C2410_ADCTSC_YP_SEN | \
+ S3C2410_ADCTSC_XP_SEN | \
+ S3C2410_ADCTSC_XY_PST(3))
+
+#define AUTOPST (S3C2410_ADCTSC_YM_SEN | \
+ S3C2410_ADCTSC_YP_SEN | \
+ S3C2410_ADCTSC_XP_SEN | \
+ S3C2410_ADCTSC_AUTO_PST | \
+ S3C2410_ADCTSC_XY_PST(0))
+
+#define DEBUG_LVL KERN_DEBUG
+
+MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
+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 */
+
+#define TS_STATE_STANDBY 0 /* initial state */
+#define TS_STATE_PRESSED 1
+#define TS_STATE_RELEASE_PENDING 2
+#define TS_STATE_RELEASE 3
+
+/*
+ * Per-touchscreen data.
+ */
+
+struct s3c2410ts {
+ struct input_dev *dev;
+ struct ts_filter_chain *chain;
+ int is_down;
+ int state;
+ struct kfifo *event_fifo;
+};
+
+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_GPG12, S3C2410_GPG12_XMON);
+ s3c2410_gpio_cfgpin(S3C2410_GPG13, S3C2410_GPG13_nXPON);
+ s3c2410_gpio_cfgpin(S3C2410_GPG14, S3C2410_GPG14_YMON);
+ s3c2410_gpio_cfgpin(S3C2410_GPG15, S3C2410_GPG15_nYPON);
+}
+
+static void s3c2410_ts_start_adc_conversion(void)
+{
+ writel(S3C2410_ADCTSC_PULL_UP_DISABLE | AUTOPST,
+ base_addr + S3C2410_ADCTSC);
+ writel(readl(base_addr + S3C2410_ADCCON) | S3C2410_ADCCON_ENABLE_START,
+ base_addr + S3C2410_ADCCON);
+}
+
+/*
+ * 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);
+
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+ printk(DEBUG_LVL "T:%06d %6s (X:%03d, Y:%03d)\n",
+ (int)tv.tv_usec, s[event], coords[0], coords[1]);
+#endif
+ } else {
+ input_report_key(ts.dev, BTN_TOUCH, 0);
+ input_report_abs(ts.dev, ABS_PRESSURE, 0);
+
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+ printk(DEBUG_LVL "T:%06d %6s\n",
+ (int)tv.tv_usec, s[event]);
+#endif
+ }
+
+ 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))
+ goto ts_exit_error;
+
+ ts_input_report(IE_DOWN, buf);
+ ts.state = TS_STATE_PRESSED;
+ break;
+
+ default:
+ goto ts_exit_error;
+ }
+
+ 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);
+ }
+
+ return;
+
+ts_exit_error: /* should not happen unless we have a bug */
+ printk(KERN_ERR __FILE__ ": event_send_timer_f failed\n");
+}
+
+/*
+ * 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))) /* should not happen */
+ printk(KERN_ERR __FILE__": stylus_updown lost event!\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 irqreturn_t stylus_action(int irq, void *dev_id)
+{
+ int buf[3];
+
+ /* Grab the ADC results. */
+ buf[1] = readl(base_addr + S3C2410_ADCDAT0) &
+ S3C2410_ADCDAT0_XPDATA_MASK;
+ buf[2] = readl(base_addr + S3C2410_ADCDAT1) &
+ S3C2410_ADCDAT1_YPDATA_MASK;
+
+ switch (ts_filter_chain_feed(ts.chain, &buf[1])) {
+ case 0:
+ /* The filter wants more points. */
+ s3c2410_ts_start_adc_conversion();
+ return IRQ_HANDLED;
+ case 1:
+ /* We have a point from the filters or no filtering enabled. */
+ buf[0] = 'P';
+ break;
+ default:
+ printk(KERN_ERR __FILE__
+ ":%d Invalid ts_filter_chain_feed return value.\n",
+ __LINE__);
+ case -1:
+ /* Error. Ignore the event. */
+ ts_filter_chain_clear(ts.chain);
+ writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC);
+ return IRQ_HANDLED;
+ };
+
+ if (unlikely(__kfifo_put(ts.event_fifo, (unsigned char *)buf,
+ sizeof(int) * 3) != sizeof(int) * 3))
+ printk(KERN_ERR __FILE__":stylus_action bug.\n");
+
+ writel(WAIT4INT(1), base_addr + S3C2410_ADCTSC);
+ mod_timer(&event_send_timer, jiffies + 1);
+
+ return IRQ_HANDLED;
+}
+
+static struct clk *adc_clock;
+
+/*
+ * 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, "Hm... too bad: no platform data for ts\n");
+ return -EINVAL;
+ }
+
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+ printk(DEBUG_LVL "Entering s3c2410ts_init\n");
+#endif
+
+ adc_clock = clk_get(NULL, "adc");
+ if (!adc_clock) {
+ dev_err(&pdev->dev, "failed to get adc clock source\n");
+ return -ENOENT;
+ }
+ clk_enable(adc_clock);
+
+#ifdef CONFIG_TOUCHSCREEN_S3C2410_DEBUG
+ printk(DEBUG_LVL "got and enabled clock\n");
+#endif
+
+ 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();
+
+ if ((info->presc & 0xff) > 0)
+ writel(S3C2410_ADCCON_PRSCEN |
+ S3C2410_ADCCON_PRSCVL(info->presc&0xFF),
+ base_addr + S3C2410_ADCCON);
+ else
+ writel(0, base_addr+S3C2410_ADCCON);
+
+ /* Initialise registers */
+ if ((info->delay & 0xffff) > 0)
+ writel(info->delay & 0xffff, base_addr + S3C2410_ADCDLY);
+
+ writel(WAIT4INT(0), base_addr + S3C2410_ADCTSC);
+
+ /* Initialise input stuff */
+ memset(&ts, 0, sizeof(struct s3c2410ts));
+ 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 irqs */
+ if (request_irq(IRQ_ADC, stylus_action, 0,
+ "s3c2410_action", ts.dev)) {
+ dev_err(&pdev->dev, "Could not allocate ts IRQ_ADC !\n");
+ iounmap(base_addr);
+ ret = -EIO;
+ goto bail3;
+ }
+ if (request_irq(IRQ_TC, stylus_updown, 0,
+ "s3c2410_action", ts.dev)) {
+ dev_err(&pdev->dev, "Could not allocate ts IRQ_TC !\n");
+ free_irq(IRQ_ADC, ts.dev);
+ iounmap(base_addr);
+ ret = -EIO;
+ goto bail4;
+ }
+
+ dev_info(&pdev->dev, "Successfully loaded\n");
+
+ /* All went ok, so register to the input system */
+ rc = input_register_device(ts.dev);
+ if (rc) {
+ ret = -EIO;
+ goto bail5;
+ }
+
+ return 0;
+
+bail5:
+ free_irq(IRQ_TC, ts.dev);
+ free_irq(IRQ_ADC, ts.dev);
+ clk_disable(adc_clock);
+ iounmap(base_addr);
+ disable_irq(IRQ_TC);
+bail4:
+ disable_irq(IRQ_ADC);
+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_ADC);
+ disable_irq(IRQ_TC);
+ free_irq(IRQ_TC,ts.dev);
+ free_irq(IRQ_ADC,ts.dev);
+
+ if (adc_clock) {
+ clk_disable(adc_clock);
+ clk_put(adc_clock);
+ adc_clock = NULL;
+ }
+
+ input_unregister_device(ts.dev);
+ iounmap(base_addr);
+
+ ts_filter_chain_destroy(ts.chain);
+
+ kfifo_free(ts.event_fifo);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+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_ADC);
+ disable_irq(IRQ_TC);
+
+ clk_disable(adc_clock);
+
+ return 0;
+}
+
+static int s3c2410ts_resume(struct platform_device *pdev)
+{
+ struct s3c2410_ts_mach_info *info =
+ ( struct s3c2410_ts_mach_info *)pdev->dev.platform_data;
+
+ clk_enable(adc_clock);
+ mdelay(1);
+
+ ts_filter_chain_clear(ts.chain);
+
+ enable_irq(IRQ_ADC);
+ enable_irq(IRQ_TC);
+
+ if ((info->presc&0xff) > 0)
+ writel(S3C2410_ADCCON_PRSCEN |
+ S3C2410_ADCCON_PRSCVL(info->presc&0xFF),
+ base_addr+S3C2410_ADCCON);
+ else
+ writel(0,base_addr+S3C2410_ADCCON);
+
+ /* Initialise registers */
+ if ((info->delay & 0xffff) > 0)
+ writel(info->delay & 0xffff, base_addr+S3C2410_ADCDLY);
+
+ 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);
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-06 07:02:29 +0000