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linux-sg2042/drivers/input/touchscreen/tsc2005.c

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/*
* TSC2005 touchscreen driver
*
* Copyright (C) 2006-2010 Nokia Corporation
*
* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
* based on TSC2301 driver by Klaus K. Pedersen <klaus.k.pedersen@nokia.com>
*
* 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
*
*/
#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>
#include <linux/spi/tsc2005.h>
/*
* The touchscreen interface operates as follows:
*
* 1) Pen is pressed against the touchscreen.
* 2) TSC2005 performs AD conversion.
* 3) After the conversion is done TSC2005 drives DAV line down.
* 4) GPIO IRQ is received and tsc2005_irq_thread() is scheduled.
* 5) tsc2005_irq_thread() queues up an spi transfer to fetch the x, y, z1, z2
* values.
* 6) tsc2005_irq_thread() reports coordinates to input layer and sets up
* tsc2005_penup_timer() to be called after TSC2005_PENUP_TIME_MS (40ms).
* 7) When the penup timer expires, there have not been touch or DAV interrupts
* during the last 40ms which means the pen has been lifted.
*
* ESD recovery via a hardware reset is done if the TSC2005 doesn't respond
* after a configurable period (in ms) of activity. If esd_timeout is 0, the
* watchdog is disabled.
*/
/* control byte 1 */
#define TSC2005_CMD 0x80
#define TSC2005_CMD_NORMAL 0x00
#define TSC2005_CMD_STOP 0x01
#define TSC2005_CMD_12BIT 0x04
/* control byte 0 */
#define TSC2005_REG_READ 0x0001
#define TSC2005_REG_PND0 0x0002
#define TSC2005_REG_X 0x0000
#define TSC2005_REG_Y 0x0008
#define TSC2005_REG_Z1 0x0010
#define TSC2005_REG_Z2 0x0018
#define TSC2005_REG_TEMP_HIGH 0x0050
#define TSC2005_REG_CFR0 0x0060
#define TSC2005_REG_CFR1 0x0068
#define TSC2005_REG_CFR2 0x0070
/* configuration register 0 */
#define TSC2005_CFR0_PRECHARGE_276US 0x0040
#define TSC2005_CFR0_STABTIME_1MS 0x0300
#define TSC2005_CFR0_CLOCK_1MHZ 0x1000
#define TSC2005_CFR0_RESOLUTION12 0x2000
#define TSC2005_CFR0_PENMODE 0x8000
#define TSC2005_CFR0_INITVALUE (TSC2005_CFR0_STABTIME_1MS | \
TSC2005_CFR0_CLOCK_1MHZ | \
TSC2005_CFR0_RESOLUTION12 | \
TSC2005_CFR0_PRECHARGE_276US | \
TSC2005_CFR0_PENMODE)
/* bits common to both read and write of configuration register 0 */
#define TSC2005_CFR0_RW_MASK 0x3fff
/* configuration register 1 */
#define TSC2005_CFR1_BATCHDELAY_4MS 0x0003
#define TSC2005_CFR1_INITVALUE TSC2005_CFR1_BATCHDELAY_4MS
/* configuration register 2 */
#define TSC2005_CFR2_MAVE_Z 0x0004
#define TSC2005_CFR2_MAVE_Y 0x0008
#define TSC2005_CFR2_MAVE_X 0x0010
#define TSC2005_CFR2_AVG_7 0x0800
#define TSC2005_CFR2_MEDIUM_15 0x3000
#define TSC2005_CFR2_INITVALUE (TSC2005_CFR2_MAVE_X | \
TSC2005_CFR2_MAVE_Y | \
TSC2005_CFR2_MAVE_Z | \
TSC2005_CFR2_MEDIUM_15 | \
TSC2005_CFR2_AVG_7)
#define MAX_12BIT 0xfff
#define TSC2005_SPI_MAX_SPEED_HZ 10000000
#define TSC2005_PENUP_TIME_MS 40
struct tsc2005_spi_rd {
struct spi_transfer spi_xfer;
u32 spi_tx;
u32 spi_rx;
};
struct tsc2005 {
struct spi_device *spi;
struct spi_message spi_read_msg;
struct tsc2005_spi_rd spi_x;
struct tsc2005_spi_rd spi_y;
struct tsc2005_spi_rd spi_z1;
struct tsc2005_spi_rd spi_z2;
struct input_dev *idev;
char phys[32];
struct mutex mutex;
/* raw copy of previous x,y,z */
int in_x;
int in_y;
int in_z1;
int in_z2;
struct timer_list penup_timer;
struct work_struct penup_work;
unsigned int esd_timeout;
struct timer_list esd_timer;
struct work_struct esd_work;
unsigned int x_plate_ohm;
bool disabled;
unsigned int disable_depth;
unsigned int pen_down;
void (*set_reset)(bool enable);
};
static void tsc2005_cmd(struct tsc2005 *ts, u8 cmd)
{
u8 tx;
struct spi_message msg;
struct spi_transfer xfer = { 0 };
tx = TSC2005_CMD | TSC2005_CMD_12BIT | cmd;
xfer.tx_buf = &tx;
xfer.rx_buf = NULL;
xfer.len = 1;
xfer.bits_per_word = 8;
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
spi_sync(ts->spi, &msg);
}
static void tsc2005_write(struct tsc2005 *ts, u8 reg, u16 value)
{
u32 tx;
struct spi_message msg;
struct spi_transfer xfer = { 0 };
tx = (reg | TSC2005_REG_PND0) << 16;
tx |= value;
xfer.tx_buf = &tx;
xfer.rx_buf = NULL;
xfer.len = 4;
xfer.bits_per_word = 24;
spi_message_init(&msg);
spi_message_add_tail(&xfer, &msg);
spi_sync(ts->spi, &msg);
}
static void tsc2005_setup_read(struct tsc2005_spi_rd *rd, u8 reg, bool last)
{
rd->spi_tx = (reg | TSC2005_REG_READ) << 16;
rd->spi_xfer.tx_buf = &rd->spi_tx;
rd->spi_xfer.rx_buf = &rd->spi_rx;
rd->spi_xfer.len = 4;
rd->spi_xfer.bits_per_word = 24;
rd->spi_xfer.cs_change = !last;
}
static void tsc2005_read(struct tsc2005 *ts, u8 reg, u16 *value)
{
struct spi_message msg;
struct tsc2005_spi_rd spi_rd = { { 0 }, 0, 0 };
tsc2005_setup_read(&spi_rd, reg, 1);
spi_message_init(&msg);
spi_message_add_tail(&spi_rd.spi_xfer, &msg);
spi_sync(ts->spi, &msg);
*value = spi_rd.spi_rx;
}
static void tsc2005_update_pen_state(struct tsc2005 *ts,
int x, int y, int pressure)
{
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, !!pressure);
ts->pen_down = 1;
}
} else {
input_report_abs(ts->idev, ABS_PRESSURE, 0);
if (ts->pen_down) {
input_report_key(ts->idev, BTN_TOUCH, 0);
ts->pen_down = 0;
}
}
input_sync(ts->idev);
dev_dbg(&ts->spi->dev, "point(%4d,%4d), pressure (%4d)\n", x, y,
pressure);
}
static irqreturn_t tsc2005_irq_handler(int irq, void *dev_id)
{
struct tsc2005 *ts = dev_id;
/* update the penup timer only if it's pending */
mod_timer_pending(&ts->penup_timer,
jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
return IRQ_WAKE_THREAD;
}
static irqreturn_t tsc2005_irq_thread(int irq, void *_ts)
{
struct tsc2005 *ts = _ts;
unsigned int pressure;
u32 x;
u32 y;
u32 z1;
u32 z2;
mutex_lock(&ts->mutex);
if (unlikely(ts->disable_depth))
goto out;
/* read the coordinates */
spi_sync(ts->spi, &ts->spi_read_msg);
x = ts->spi_x.spi_rx;
y = ts->spi_y.spi_rx;
z1 = ts->spi_z1.spi_rx;
z2 = ts->spi_z2.spi_rx;
/* validate position */
if (unlikely(x > MAX_12BIT || y > MAX_12BIT))
goto out;
/* skip coords if the pressure components are out of range */
if (unlikely(z1 == 0 || z2 > MAX_12BIT || z1 >= z2))
goto out;
/* skip point if this is a pen down with the exact same values as
* the value before pen-up - that implies SPI fed us stale data
*/
if (!ts->pen_down &&
ts->in_x == x &&
ts->in_y == y &&
ts->in_z1 == z1 &&
ts->in_z2 == z2)
goto out;
/* At this point we are happy we have a valid and useful reading.
* Remember it for later comparisons. We may now begin downsampling
*/
ts->in_x = x;
ts->in_y = y;
ts->in_z1 = z1;
ts->in_z2 = z2;
/* compute touch pressure resistance using equation #1 */
pressure = x * (z2 - z1) / z1;
pressure = pressure * ts->x_plate_ohm / 4096;
if (unlikely(pressure > MAX_12BIT))
goto out;
tsc2005_update_pen_state(ts, x, y, pressure);
/* set the penup timer */
mod_timer(&ts->penup_timer,
jiffies + msecs_to_jiffies(TSC2005_PENUP_TIME_MS));
if (!ts->esd_timeout)
goto out;
/* update the watchdog timer */
mod_timer(&ts->esd_timer,
round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
out:
mutex_unlock(&ts->mutex);
return IRQ_HANDLED;
}
static void tsc2005_penup_timer(unsigned long data)
{
struct tsc2005 *ts = (struct tsc2005 *)data;
schedule_work(&ts->penup_work);
}
static void tsc2005_penup_work(struct work_struct *work)
{
struct tsc2005 *ts = container_of(work, struct tsc2005, penup_work);
mutex_lock(&ts->mutex);
tsc2005_update_pen_state(ts, 0, 0, 0);
mutex_unlock(&ts->mutex);
}
static void tsc2005_start_scan(struct tsc2005 *ts)
{
tsc2005_write(ts, TSC2005_REG_CFR0, TSC2005_CFR0_INITVALUE);
tsc2005_write(ts, TSC2005_REG_CFR1, TSC2005_CFR1_INITVALUE);
tsc2005_write(ts, TSC2005_REG_CFR2, TSC2005_CFR2_INITVALUE);
tsc2005_cmd(ts, TSC2005_CMD_NORMAL);
}
static void tsc2005_stop_scan(struct tsc2005 *ts)
{
tsc2005_cmd(ts, TSC2005_CMD_STOP);
}
/* must be called with mutex held */
static void tsc2005_disable(struct tsc2005 *ts)
{
if (ts->disable_depth++ != 0)
return;
disable_irq(ts->spi->irq);
if (ts->esd_timeout)
del_timer_sync(&ts->esd_timer);
del_timer_sync(&ts->penup_timer);
tsc2005_stop_scan(ts);
}
/* must be called with mutex held */
static void tsc2005_enable(struct tsc2005 *ts)
{
if (--ts->disable_depth != 0)
return;
tsc2005_start_scan(ts);
enable_irq(ts->spi->irq);
if (!ts->esd_timeout)
return;
mod_timer(&ts->esd_timer,
round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
}
static ssize_t tsc2005_disable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct spi_device *spi = to_spi_device(dev);
struct tsc2005 *ts = spi_get_drvdata(spi);
return sprintf(buf, "%u\n", ts->disabled);
}
static ssize_t tsc2005_disable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct spi_device *spi = to_spi_device(dev);
struct tsc2005 *ts = spi_get_drvdata(spi);
unsigned long res;
int i;
if (strict_strtoul(buf, 10, &res) < 0)
return -EINVAL;
i = res ? 1 : 0;
mutex_lock(&ts->mutex);
if (i == ts->disabled)
goto out;
ts->disabled = i;
if (i)
tsc2005_disable(ts);
else
tsc2005_enable(ts);
out:
mutex_unlock(&ts->mutex);
return count;
}
static DEVICE_ATTR(disable, 0664, tsc2005_disable_show, tsc2005_disable_store);
static ssize_t tsc2005_selftest_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct spi_device *spi = to_spi_device(dev);
struct tsc2005 *ts = spi_get_drvdata(spi);
u16 temp_high;
u16 temp_high_orig;
u16 temp_high_test;
unsigned int result;
if (!ts->set_reset) {
dev_warn(&ts->spi->dev,
"unable to selftest: no reset function\n");
result = 0;
goto out;
}
mutex_lock(&ts->mutex);
/*
* Test TSC2005 communications via temp high register.
*/
tsc2005_disable(ts);
result = 1;
tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high_orig);
temp_high_test = (temp_high_orig - 1) & MAX_12BIT;
tsc2005_write(ts, TSC2005_REG_TEMP_HIGH, temp_high_test);
tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
if (temp_high != temp_high_test) {
dev_warn(dev, "selftest failed: %d != %d\n",
temp_high, temp_high_test);
result = 0;
}
/* hardware reset */
ts->set_reset(0);
usleep_range(100, 500); /* only 10us required */
ts->set_reset(1);
tsc2005_enable(ts);
/* test that the reset really happened */
tsc2005_read(ts, TSC2005_REG_TEMP_HIGH, &temp_high);
if (temp_high != temp_high_orig) {
dev_warn(dev, "selftest failed after reset: %d != %d\n",
temp_high, temp_high_orig);
result = 0;
}
mutex_unlock(&ts->mutex);
out:
return sprintf(buf, "%u\n", result);
}
static DEVICE_ATTR(selftest, S_IRUGO, tsc2005_selftest_show, NULL);
static void tsc2005_esd_timer(unsigned long data)
{
struct tsc2005 *ts = (struct tsc2005 *)data;
schedule_work(&ts->esd_work);
}
static void tsc2005_esd_work(struct work_struct *work)
{
struct tsc2005 *ts = container_of(work, struct tsc2005, esd_work);
u16 r;
mutex_lock(&ts->mutex);
if (ts->disable_depth)
goto out;
/*
* If we cannot read our known value from configuration register 0 then
* reset the controller as if from power-up and start scanning again.
*/
tsc2005_read(ts, TSC2005_REG_CFR0, &r);
if ((r ^ TSC2005_CFR0_INITVALUE) & TSC2005_CFR0_RW_MASK) {
dev_info(&ts->spi->dev, "TSC2005 not responding - resetting\n");
ts->set_reset(0);
tsc2005_update_pen_state(ts, 0, 0, 0);
usleep_range(100, 500); /* only 10us required */
ts->set_reset(1);
tsc2005_start_scan(ts);
}
/* re-arm the watchdog */
mod_timer(&ts->esd_timer,
round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
out:
mutex_unlock(&ts->mutex);
}
static void __devinit tsc2005_setup_spi_xfer(struct tsc2005 *ts)
{
tsc2005_setup_read(&ts->spi_x, TSC2005_REG_X, 0);
tsc2005_setup_read(&ts->spi_y, TSC2005_REG_Y, 0);
tsc2005_setup_read(&ts->spi_z1, TSC2005_REG_Z1, 0);
tsc2005_setup_read(&ts->spi_z2, TSC2005_REG_Z2, 1);
spi_message_init(&ts->spi_read_msg);
spi_message_add_tail(&ts->spi_x.spi_xfer, &ts->spi_read_msg);
spi_message_add_tail(&ts->spi_y.spi_xfer, &ts->spi_read_msg);
spi_message_add_tail(&ts->spi_z1.spi_xfer, &ts->spi_read_msg);
spi_message_add_tail(&ts->spi_z2.spi_xfer, &ts->spi_read_msg);
}
static struct attribute *tsc2005_attrs[] = {
&dev_attr_disable.attr,
&dev_attr_selftest.attr,
NULL
};
static struct attribute_group tsc2005_attr_group = {
.attrs = tsc2005_attrs,
};
static int __devinit tsc2005_setup(struct tsc2005 *ts,
struct tsc2005_platform_data *pdata)
{
int r;
int fudge_x;
int fudge_y;
int fudge_p;
int p_max;
int x_max;
int y_max;
mutex_init(&ts->mutex);
tsc2005_setup_spi_xfer(ts);
init_timer(&ts->penup_timer);
setup_timer(&ts->penup_timer, tsc2005_penup_timer, (unsigned long)ts);
INIT_WORK(&ts->penup_work, tsc2005_penup_work);
fudge_x = pdata->ts_x_fudge ? : 4;
fudge_y = pdata->ts_y_fudge ? : 8;
fudge_p = pdata->ts_pressure_fudge ? : 2;
x_max = pdata->ts_x_max ? : MAX_12BIT;
y_max = pdata->ts_y_max ? : MAX_12BIT;
p_max = pdata->ts_pressure_max ? : MAX_12BIT;
ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
ts->esd_timeout = pdata->esd_timeout_ms;
ts->set_reset = pdata->set_reset;
ts->idev = input_allocate_device();
if (ts->idev == NULL)
return -ENOMEM;
ts->idev->name = "TSC2005 touchscreen";
snprintf(ts->phys, sizeof(ts->phys), "%s/input-ts",
dev_name(&ts->spi->dev));
ts->idev->phys = ts->phys;
ts->idev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);
ts->idev->absbit[0] = BIT(ABS_X) | BIT(ABS_Y) | BIT(ABS_PRESSURE);
ts->idev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
input_set_abs_params(ts->idev, ABS_X, 0, x_max, fudge_x, 0);
input_set_abs_params(ts->idev, ABS_Y, 0, y_max, fudge_y, 0);
input_set_abs_params(ts->idev, ABS_PRESSURE, 0, p_max, fudge_p, 0);
r = request_threaded_irq(ts->spi->irq, tsc2005_irq_handler,
tsc2005_irq_thread, IRQF_TRIGGER_RISING,
"tsc2005", ts);
if (r) {
dev_err(&ts->spi->dev, "request_threaded_irq(): %d\n", r);
goto err1;
}
set_irq_wake(ts->spi->irq, 1);
r = input_register_device(ts->idev);
if (r) {
dev_err(&ts->spi->dev, "input_register_device(): %d\n", r);
goto err2;
}
r = sysfs_create_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
if (r)
dev_warn(&ts->spi->dev, "sysfs entry creation failed: %d\n", r);
tsc2005_start_scan(ts);
if (!ts->esd_timeout || !ts->set_reset)
goto done;
/* start the optional ESD watchdog */
setup_timer(&ts->esd_timer, tsc2005_esd_timer, (unsigned long)ts);
INIT_WORK(&ts->esd_work, tsc2005_esd_work);
mod_timer(&ts->esd_timer,
round_jiffies(jiffies + msecs_to_jiffies(ts->esd_timeout)));
done:
return 0;
err2:
free_irq(ts->spi->irq, ts);
err1:
input_free_device(ts->idev);
return r;
}
static int __devinit tsc2005_probe(struct spi_device *spi)
{
struct tsc2005_platform_data *pdata = spi->dev.platform_data;
struct tsc2005 *ts;
int r;
if (spi->irq < 0) {
dev_dbg(&spi->dev, "no irq\n");
return -ENODEV;
}
if (!pdata) {
dev_dbg(&spi->dev, "no platform data\n");
return -ENODEV;
}
ts = kzalloc(sizeof(*ts), GFP_KERNEL);
if (ts == NULL)
return -ENOMEM;
spi_set_drvdata(spi, ts);
ts->spi = spi;
spi->dev.power.power_state = PMSG_ON;
spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
if (!spi->max_speed_hz)
spi->max_speed_hz = TSC2005_SPI_MAX_SPEED_HZ;
spi_setup(spi);
r = tsc2005_setup(ts, pdata);
if (r)
kfree(ts);
return r;
}
static int __devexit tsc2005_remove(struct spi_device *spi)
{
struct tsc2005 *ts = spi_get_drvdata(spi);
mutex_lock(&ts->mutex);
tsc2005_disable(ts);
mutex_unlock(&ts->mutex);
if (ts->esd_timeout)
del_timer_sync(&ts->esd_timer);
del_timer_sync(&ts->penup_timer);
flush_work(&ts->esd_work);
flush_work(&ts->penup_work);
sysfs_remove_group(&ts->spi->dev.kobj, &tsc2005_attr_group);
free_irq(ts->spi->irq, ts);
input_unregister_device(ts->idev);
kfree(ts);
return 0;
}
#ifdef CONFIG_PM
static int tsc2005_suspend(struct spi_device *spi, pm_message_t mesg)
{
struct spi_device *spi = to_spi_device(dev);
struct tsc2005 *ts = spi_get_drvdata(spi);
mutex_lock(&ts->mutex);
tsc2005_disable(ts);
mutex_unlock(&ts->mutex);
return 0;
}
static int tsc2005_resume(struct spi_device *spi)
{
struct spi_device *spi = to_spi_device(dev);
struct tsc2005 *ts = spi_get_drvdata(spi);
mutex_lock(&ts->mutex);
tsc2005_enable(ts);
mutex_unlock(&ts->mutex);
return 0;
}
#endif
static struct spi_driver tsc2005_driver = {
.driver = {
.name = "tsc2005",
.owner = THIS_MODULE,
},
#ifdef CONFIG_PM
.suspend = tsc2005_suspend,
.resume = tsc2005_resume,
#endif
.probe = tsc2005_probe,
.remove = __devexit_p(tsc2005_remove),
};
static int __init tsc2005_init(void)
{
printk(KERN_INFO "TSC2005 driver initializing\n");
return spi_register_driver(&tsc2005_driver);
}
module_init(tsc2005_init);
static void __exit tsc2005_exit(void)
{
spi_unregister_driver(&tsc2005_driver);
}
module_exit(tsc2005_exit);
MODULE_AUTHOR("Lauri Leukkunen <lauri.leukkunen@nokia.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:tsc2005");
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