+++ /dev/null
-/*
- * TSC2046 Touchscreen driver
- *
- * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
- *
- * Communication details from original TI driver
- * Copyright (C) 2004-2005 Texas Instruments, Inc.
- *
- * Structure based heavily on TSC2301 driver
- * Copyright (C) 2005-2006 Nokia Corporation
- *
- * 2007 (c) MontaVista Software, Inc. This file is licensed under
- * the terms of the GNU General Public License version 2. This program
- * is licensed "as is" without any warranty of any kind, whether express
- * or implied.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/spi/spi.h>
-
-#ifdef CONFIG_ARCH_OMAP
-#include <asm/arch/gpio.h>
-#endif
-
-#include <linux/spi/tsc2046.h>
-
-/* TSC2046 commands */
-#define START_BYTE 0x8000
-#define X_CMDWD 0xd300
-#define Y_CMDWD 0x9300
-#define Z1_CMDWD 0xb300
-#define Z2_CMDWD 0xc300
-
-#define TSC2046_TS_SCAN_TIME 1
-#define MAX_12BIT ((1 << 12) - 1)
-
-struct tsc2046_ts {
- struct input_dev *idev;
- char phys[32];
- struct timer_list timer;
- spinlock_t lock;
-
- struct spi_transfer read_xfer[3];
- struct spi_message read_msg;
- struct spi_message enable_msg;
- u16 data[5];
-
- u16 x;
- u16 y;
- u16 p;
- int sample_cnt;
-
- int ignore_last : 1;
- u16 x_plate_ohm;
- int max_pressure;
- int touch_pressure;
- int pressure_limit;
-
- u16 irq_enabled:1;
- u16 pen_down:1;
- u16 disabled:1;
- u16 pending:1;
-
- s16 dav_gpio;
- int irq;
-};
-
-static const u16 tsc2046_ts_cmd_data[] = {
- START_BYTE, X_CMDWD, Y_CMDWD, Z1_CMDWD, Z2_CMDWD,
-};
-
-static int device_suspended(struct device *dev)
-{
- struct tsc2046 *tsc = dev_get_drvdata(dev);
- return dev->power.power_state.event != PM_EVENT_ON || tsc->ts->disabled;
-}
-
-static void update_pen_state(struct tsc2046 *tsc, int x, int y, int pressure)
-{
- struct tsc2046_ts *ts = tsc->ts;
- int sync = 0;
-
- if (pressure) {
- input_report_abs(ts->idev, ABS_X, x);
- input_report_abs(ts->idev, ABS_Y, y);
- input_report_abs(ts->idev, ABS_PRESSURE, pressure);
- if (!ts->pen_down)
- input_report_key(ts->idev, BTN_TOUCH, 1);
- sync = 1;
- } else if (ts->pen_down) {
- input_report_abs(ts->idev, ABS_PRESSURE, 0);
- input_report_key(ts->idev, BTN_TOUCH, 0);
- sync = 1;
- }
-
- if (sync)
- input_sync(ts->idev);
-
- ts->pen_down = pressure ? 1 : 0;
-
-#ifdef VERBOSE
- dev_dbg(&tsc->spi->dev, "x %4d y %4d p %4d\n", x, y, pressure);
-#endif
-}
-
-#define CONV_DATA(d1, d2) \
- (((d1 & 0x7f) << 5) | ((d2 >> 11) & 0x1f))
-
-/*
- * This procedure is called by the SPI framework after the coordinates
- * have been read from TSC2046
- */
-static void tsc2046_ts_rx(void *arg)
-{
- struct tsc2046 *tsc = arg;
- struct tsc2046_ts *ts = tsc->ts;
- unsigned int x, y, z1, z2, pressure;
-
- x = CONV_DATA(ts->data[2], ts->data[3]);
- y = CONV_DATA(ts->data[1], ts->data[2]);
- z1 = CONV_DATA(ts->data[3], ts->data[4]);
- z2 = CONV_DATA(ts->data[4], 0);
-
- if (z1) {
- pressure = ts->x_plate_ohm * x;
- pressure /= 4096;
- pressure *= z2 - z1;
- pressure /= z1;
- } else
- pressure = 0;
-
- /*
- * If pressure value is above a preset limit (pen is barely
- * touching the screen) we can't trust the coordinate values.
- */
- if (pressure < ts->pressure_limit && x < MAX_12BIT && y < MAX_12BIT) {
- ts->pressure_limit = ts->max_pressure;
- if (ts->ignore_last) {
- if (ts->sample_cnt)
- update_pen_state(tsc, ts->x, ts->y, ts->p);
- ts->x = x;
- ts->y = y;
- ts->p = pressure;
- } else
- update_pen_state(tsc, x, y, pressure);
- ts->sample_cnt++;
- }
-
- mod_timer(&ts->timer,
- jiffies + msecs_to_jiffies(TSC2046_TS_SCAN_TIME));
-}
-
-static int is_pen_down(struct tsc2046_ts *ts)
-{
- return ts->pen_down;
-}
-
-/*
- * Timer is called every TSC2046_TS_SCAN_TIME when the pen is down
- */
-static void tsc2046_ts_timer(unsigned long arg)
-{
- struct tsc2046 *tsc = (void *) arg;
- struct tsc2046_ts *ts = tsc->ts;
- unsigned long flags;
- int ndav;
- int r;
-
- spin_lock_irqsave(&ts->lock, flags);
- ndav = omap_get_gpio_datain(ts->dav_gpio);
- if (ndav || device_suspended(&tsc->spi->dev)) {
- /* Pen has been lifted */
- if (!device_suspended(&tsc->spi->dev) &&
- !ts->irq_enabled) {
- ts->irq_enabled = 1;
- enable_irq(ts->irq);
- }
- update_pen_state(tsc, 0, 0, 0);
- ts->pending = 0;
- spin_unlock_irqrestore(&ts->lock, flags);
-
- } else {
- ts->pen_down = 1;
- spin_unlock_irqrestore(&ts->lock, flags);
-
- r = spi_async(tsc->spi, &ts->read_msg);
- if (r)
- dev_err(&tsc->spi->dev, "ts: spi_async() failed");
- }
-}
-
-/*
- * This interrupt is called when pen is down and first coordinates are
- * available. That is indicated by a falling edge on DEV line. IRQ is
- * disabled here because while the pen is down the coordinates are
- * read by a timer.
- */
-static irqreturn_t tsc2046_ts_irq_handler(int irq, void *dev_id)
-{
- struct tsc2046 *tsc = dev_id;
- struct tsc2046_ts *ts = tsc->ts;
- unsigned long flags;
-
- spin_lock_irqsave(&ts->lock, flags);
- if (ts->irq_enabled) {
- ts->irq_enabled = 0;
- disable_irq(ts->irq);
- ts->pending = 1;
- ts->pressure_limit = ts->touch_pressure;
- ts->sample_cnt = 0;
- mod_timer(&ts->timer,
- jiffies + msecs_to_jiffies(TSC2046_TS_SCAN_TIME));
- }
- spin_unlock_irqrestore(&ts->lock, flags);
-
- return IRQ_HANDLED;
-}
-
-/* Must be called with ts->lock held */
-static void tsc2046_ts_disable(struct tsc2046 *tsc)
-{
- struct tsc2046_ts *ts = tsc->ts;
-
- if (ts->disabled)
- return;
-
- ts->disabled = 1;
- if (!ts->pending) {
- ts->irq_enabled = 0;
- disable_irq(ts->irq);
- } else {
- while (ts->pending) {
- spin_unlock_irq(&ts->lock);
- msleep(1);
- spin_lock_irq(&ts->lock);
- }
- }
-}
-
-static void tsc2046_ts_enable(struct tsc2046 *tsc)
-{
- struct tsc2046_ts *ts = tsc->ts;
-
- if (!ts->disabled)
- return;
-
- ts->disabled = 0;
- ts->irq_enabled = 1;
- enable_irq(ts->irq);
-}
-
-#ifdef CONFIG_PM
-static int tsc2046_suspend(struct spi_device *spi, pm_message_t mesg)
-{
- struct tsc2046 *tsc = dev_get_drvdata(&spi->dev);
- struct tsc2046_ts *ts = tsc->ts;
-
- spin_lock_irq(&ts->lock);
- tsc2046_ts_disable(tsc);
- spin_unlock_irq(&ts->lock);
-
- return 0;
-}
-
-static int tsc2046_resume(struct spi_device *spi)
-{
- struct tsc2046 *tsc = dev_get_drvdata(&spi->dev);
- struct tsc2046_ts *ts = tsc->ts;
-
- spin_lock_irq(&ts->lock);
- tsc2046_ts_enable(tsc);
- spin_unlock_irq(&ts->lock);
-
- return 0;
-}
-#endif
-
-static void tsc2046_ts_setup_spi_xfer(struct tsc2046 *tsc)
-{
- struct tsc2046_ts *ts = tsc->ts;
- struct spi_message *m = &ts->read_msg;
- struct spi_transfer *x = &ts->read_xfer[1];
-
- spi_message_init(m);
-
- /* read and write data in one transaction */
- x->tx_buf = &tsc2046_ts_cmd_data;
- x->rx_buf = &ts->data;
- x->len = 10;
- spi_message_add_tail(x, m);
-
- /* send another START_BYTE to (re)enable pen interrupts */
- x++;
- x->tx_buf = &tsc2046_ts_cmd_data[0];
- x->len = 2;
- spi_message_add_tail(x, m);
-
- m->complete = tsc2046_ts_rx;
- m->context = tsc;
-}
-
-static ssize_t tsc2046_ts_pen_down_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct tsc2046 *tsc = dev_get_drvdata(dev);
-
- return sprintf(buf, "%u\n", is_pen_down(tsc->ts));
-}
-
-static DEVICE_ATTR(pen_down, S_IRUGO, tsc2046_ts_pen_down_show, NULL);
-
-static ssize_t tsc2046_ts_disable_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct tsc2046 *tsc = dev_get_drvdata(dev);
- struct tsc2046_ts *ts = tsc->ts;
-
- return sprintf(buf, "%u\n", ts->disabled);
-}
-
-static ssize_t tsc2046_ts_disable_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct tsc2046 *tsc = dev_get_drvdata(dev);
- struct tsc2046_ts *ts = tsc->ts;
- char *endp;
- int i;
-
- i = simple_strtoul(buf, &endp, 10);
- spin_lock_irq(&ts->lock);
-
- if (i)
- tsc2046_ts_disable(tsc);
- else
- tsc2046_ts_enable(tsc);
-
- spin_unlock_irq(&ts->lock);
-
- return count;
-}
-
-static DEVICE_ATTR(disable_ts, 0664, tsc2046_ts_disable_show,
- tsc2046_ts_disable_store);
-
-int __devinit tsc2046_ts_init(struct tsc2046 *tsc,
- struct tsc2046_platform_data *pdata)
-{
- struct tsc2046_ts *ts;
- struct input_dev *idev;
- int dav_gpio, r;
-
- if (pdata->dav_gpio < 0) {
- dev_err(&tsc->spi->dev, "need DAV GPIO");
- return -EINVAL;
- }
- dav_gpio = pdata->dav_gpio;
-
- ts = kzalloc(sizeof(*ts), GFP_KERNEL);
- if (ts == NULL)
- return -ENOMEM;
- tsc->ts = ts;
-
- ts->dav_gpio = dav_gpio;
-#ifdef CONFIG_ARCH_OMAP
- r = omap_request_gpio(dav_gpio);
- if (r < 0) {
- dev_err(&tsc->spi->dev, "unable to get DAV GPIO");
- goto err1;
- }
- omap_set_gpio_direction(dav_gpio, 1);
- if (pdata->gpio_debounce) {
- omap_set_gpio_debounce(tsc->gpio, 1);
- omap_set_gpio_debounce_time(tsc->gpio, pdata->gpio_debounce);
- }
-
- ts->irq = OMAP_GPIO_IRQ(dav_gpio);
-#endif
- setup_timer(&ts->timer, tsc2046_ts_timer, (unsigned long)tsc);
-
- spin_lock_init(&ts->lock);
-
- ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
- ts->max_pressure = pdata->ts_max_pressure ? : MAX_12BIT;
- ts->touch_pressure = pdata->ts_touch_pressure ? : ts->max_pressure;
- ts->ignore_last = pdata->ts_ignore_last;
-
- idev = input_allocate_device();
- if (idev == NULL) {
- r = -ENOMEM;
- goto err2;
- }
- idev->name = "TSC2046 touchscreen";
- snprintf(ts->phys, sizeof(ts->phys),
- "%s/input-ts", tsc->spi->dev.bus_id);
- idev->phys = ts->phys;
-
- idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
- idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
- ts->idev = idev;
-
- tsc2046_ts_setup_spi_xfer(tsc);
-
- /* These parameters should perhaps be configurable? */
- input_set_abs_params(idev, ABS_X, 0, 4096, 0, 0);
- input_set_abs_params(idev, ABS_Y, 0, 4096, 0, 0);
- input_set_abs_params(idev, ABS_PRESSURE, 0, 1024, 0, 0);
-
- ts->irq_enabled = 1;
- r = request_irq(ts->irq, tsc2046_ts_irq_handler,
- IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_FALLING,
- "tsc2046-ts", tsc);
- if (r < 0) {
- dev_err(&tsc->spi->dev, "unable to get DAV IRQ");
- goto err3;
- }
- set_irq_wake(ts->irq, 1);
-
- if (device_create_file(&tsc->spi->dev, &dev_attr_pen_down) < 0)
- goto err4;
- if (device_create_file(&tsc->spi->dev, &dev_attr_disable_ts) < 0)
- goto err5;
-
- r = input_register_device(idev);
- if (r < 0) {
- dev_err(&tsc->spi->dev, "can't register touchscreen device\n");
- goto err6;
- }
-
- /* kick off a transaction to enable pen interrupts */
- spi_async(tsc->spi, &ts->read_msg);
-
- return 0;
-err6:
- device_remove_file(&tsc->spi->dev, &dev_attr_disable_ts);
-err5:
- device_remove_file(&tsc->spi->dev, &dev_attr_pen_down);
-err4:
- free_irq(ts->irq, tsc);
-err3:
- input_free_device(idev);
-err2:
-#ifdef CONFIG_ARCH_OMAP
- omap_free_gpio(dav_gpio);
-#endif
-err1:
- kfree(ts);
- return r;
-}
-EXPORT_SYMBOL(tsc2046_ts_init);
-
-void __devexit tsc2046_ts_exit(struct tsc2046 *tsc)
-{
- struct tsc2046_ts *ts = tsc->ts;
- unsigned long flags;
-
- spin_lock_irqsave(&ts->lock, flags);
- tsc2046_ts_disable(tsc);
- spin_unlock_irqrestore(&ts->lock, flags);
-
- device_remove_file(&tsc->spi->dev, &dev_attr_disable_ts);
- device_remove_file(&tsc->spi->dev, &dev_attr_pen_down);
-
- free_irq(ts->irq, tsc);
- input_unregister_device(ts->idev);
-
-#ifdef CONFIG_ARCH_OMAP
- omap_free_gpio(ts->dav_gpio);
-#endif
- kfree(ts);
-}
-EXPORT_SYMBOL(tsc2046_ts_exit);
-
-
-static int __devinit tsc2046_probe(struct spi_device *spi)
-{
- struct tsc2046 *tsc;
- struct tsc2046_platform_data *pdata = spi->dev.platform_data;
- int r = -ENODEV;
-
- dev_dbg(&spi->dev, "%s\n", __FUNCTION__);
-
- if (!pdata) {
- dev_dbg(&spi->dev, "no platform data?\n");
- return -ENODEV;
- }
-
- tsc = kzalloc(sizeof(*tsc), GFP_KERNEL);
- if (tsc == NULL)
- return -ENOMEM;
-
- dev_set_drvdata(&spi->dev, tsc);
- tsc->spi = spi;
- spi->dev.power.power_state = PMSG_ON;
-
- spi->mode = SPI_MODE_0;
- spi->bits_per_word = 16;
-
- /*
- * The max speed might've been defined by the board-specific
- * struct
- */
- if (!spi->max_speed_hz)
- spi->max_speed_hz = TSC2046_HZ;
- spi_setup(spi);
-
- r = tsc2046_ts_init(tsc, pdata);
- if (r)
- goto err1;
-
- return 0;
-err1:
- kfree(tsc);
- return r;
-}
-
-static int __devexit tsc2046_remove(struct spi_device *spi)
-{
- struct tsc2046 *tsc = dev_get_drvdata(&spi->dev);
-
- dev_dbg(&tsc->spi->dev, "%s\n", __FUNCTION__);
-
- tsc2046_ts_exit(tsc);
- kfree(tsc);
-
- return 0;
-}
-
-static struct spi_driver tsc2046_driver = {
- .driver = {
- .name = "tsc2046",
- .bus = &spi_bus_type,
- .owner = THIS_MODULE,
- },
- .probe = tsc2046_probe,
- .remove = __devexit_p(tsc2046_remove),
-#ifdef CONFIG_PM
- .suspend = tsc2046_suspend,
- .resume = tsc2046_resume,
-#endif
-};
-
-static int __init tsc2046_init(void)
-{
- printk("TSC2046 driver initializing\n");
-
- return spi_register_driver(&tsc2046_driver);
-}
-module_init(tsc2046_init);
-
-static void __exit tsc2046_exit(void)
-{
- spi_unregister_driver(&tsc2046_driver);
-}
-module_exit(tsc2046_exit);
-
-MODULE_AUTHOR("Kevin Hilman <khilman@mvista.com>");
-MODULE_LICENSE("GPL");
projects / linux-2.6-omap-h63xx.git / commitdiff