#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/ads7846.h>
+#include <linux/regulator/consumer.h>
#include <asm/irq.h>
-
/*
* This code has been heavily tested on a Nokia 770, and lightly
- * tested on other ads7846 devices (OSK/Mistral, Lubbock).
+ * tested on other ads7846 devices (OSK/Mistral, Lubbock, Spitz).
* TSC2046 is just newer ads7846 silicon.
* Support for ads7843 tested on Atmel at91sam926x-EK.
* Support for ads7845 has only been stubbed in.
* have to maintain our own SW IRQ disabled status. This should be
* removed as soon as the affected platform's IRQ handling is fixed.
*
- * app note sbaa036 talks in more detail about accurate sampling...
+ * App note sbaa036 talks in more detail about accurate sampling...
* that ought to help in situations like LCDs inducing noise (which
* can also be helped by using synch signals) and more generally.
* This driver tries to utilize the measures described in the app
struct ads7846 {
struct input_dev *input;
char phys[32];
+ char name[32];
struct spi_device *spi;
+ struct regulator *reg;
#if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE)
struct attribute_group *attr_group;
u16 x_plate_ohms;
u16 pressure_max;
+ bool swap_xy;
+
struct ads7846_packet *packet;
struct spi_transfer xfer[18];
void (*filter_cleanup)(void *data);
int (*get_pendown_state)(void);
int gpio_pendown;
+
+ void (*wait_for_sync)(void);
};
/* leave chip selected when we're done, for quicker re-select? */
static DEVICE_ATTR(name, S_IRUGO, name ## _show, NULL);
-/* Sysfs conventions report temperatures in millidegrees Celcius.
+/* Sysfs conventions report temperatures in millidegrees Celsius.
* ADS7846 could use the low-accuracy two-sample scheme, but can't do the high
* accuracy scheme without calibration data. For now we won't try either;
* userspace sees raw sensor values, and must scale/calibrate appropriately.
return !gpio_get_value(ts->gpio_pendown);
}
+static void null_wait_for_sync(void)
+{
+}
+
/*
* PENIRQ only kicks the timer. The timer only reissues the SPI transfer,
* to retrieve touchscreen status.
* once more the measurement
*/
if (packet->tc.ignore || Rt > ts->pressure_max) {
-#ifdef VERBOSE
- pr_debug("%s: ignored %d pressure %d\n",
- dev_name(&ts->spi->dev), packet->tc.ignore, Rt);
-#endif
+ dev_vdbg(&ts->spi->dev, "ignored %d pressure %d\n",
+ packet->tc.ignore, Rt);
hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
HRTIMER_MODE_REL);
return;
if (!ts->pendown) {
input_report_key(input, BTN_TOUCH, 1);
ts->pendown = 1;
-#ifdef VERBOSE
- dev_dbg(&ts->spi->dev, "DOWN\n");
-#endif
+ dev_vdbg(&ts->spi->dev, "DOWN\n");
}
+
+ if (ts->swap_xy)
+ swap(x, y);
+
input_report_abs(input, ABS_X, x);
input_report_abs(input, ABS_Y, y);
- input_report_abs(input, ABS_PRESSURE, Rt);
+ input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt);
input_sync(input);
-#ifdef VERBOSE
- dev_dbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt);
-#endif
+ dev_vdbg(&ts->spi->dev, "%4d/%4d/%4d\n", x, y, Rt);
}
hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_PERIOD),
default:
BUG();
}
+ ts->wait_for_sync();
status = spi_async(ts->spi, m);
if (status)
dev_err(&ts->spi->dev, "spi_async --> %d\n",
struct ads7846 *ts = container_of(handle, struct ads7846, timer);
int status = 0;
- spin_lock_irq(&ts->lock);
+ spin_lock(&ts->lock);
if (unlikely(!get_pendown_state(ts) ||
device_suspended(&ts->spi->dev))) {
input_sync(input);
ts->pendown = 0;
-#ifdef VERBOSE
- dev_dbg(&ts->spi->dev, "UP\n");
-#endif
+ dev_vdbg(&ts->spi->dev, "UP\n");
}
/* measurement cycle ended */
} else {
/* pen is still down, continue with the measurement */
ts->msg_idx = 0;
+ ts->wait_for_sync();
status = spi_async(ts->spi, &ts->msg[0]);
if (status)
dev_err(&ts->spi->dev, "spi_async --> %d\n", status);
}
- spin_unlock_irq(&ts->lock);
+ spin_unlock(&ts->lock);
return HRTIMER_NORESTART;
}
* that here. (The "generic irq" framework may help...)
*/
ts->irq_disabled = 1;
- disable_irq(ts->spi->irq);
+ disable_irq_nosync(ts->spi->irq);
ts->pending = 1;
hrtimer_start(&ts->timer, ktime_set(0, TS_POLL_DELAY),
HRTIMER_MODE_REL);
}
}
+ regulator_disable(ts->reg);
+
/* we know the chip's in lowpower mode since we always
* leave it that way after every request
*/
if (!ts->disabled)
return;
+ regulator_enable(ts->reg);
+
ts->disabled = 0;
ts->irq_disabled = 0;
enable_irq(ts->spi->irq);
ts->spi = spi;
ts->input = input_dev;
ts->vref_mv = pdata->vref_mv;
+ ts->swap_xy = pdata->swap_xy;
hrtimer_init(&ts->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
ts->timer.function = ads7846_timer;
ts->penirq_recheck_delay_usecs =
pdata->penirq_recheck_delay_usecs;
+ ts->wait_for_sync = pdata->wait_for_sync ? : null_wait_for_sync;
+
snprintf(ts->phys, sizeof(ts->phys), "%s/input0", dev_name(&spi->dev));
+ snprintf(ts->name, sizeof(ts->name), "ADS%d Touchscreen", ts->model);
- input_dev->name = "ADS784x Touchscreen";
+ input_dev->name = ts->name;
input_dev->phys = ts->phys;
input_dev->dev.parent = &spi->dev;
ts->last_msg = m;
+ ts->reg = regulator_get(&spi->dev, "vcc");
+ if (IS_ERR(ts->reg)) {
+ dev_err(&spi->dev, "unable to get regulator: %ld\n",
+ PTR_ERR(ts->reg));
+ goto err_free_gpio;
+ }
+
+ err = regulator_enable(ts->reg);
+ if (err) {
+ dev_err(&spi->dev, "unable to enable regulator: %d\n", err);
+ goto err_put_regulator;
+ }
+
if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING,
spi->dev.driver->name, ts)) {
- dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
- err = -EBUSY;
- goto err_free_gpio;
+ dev_info(&spi->dev,
+ "trying pin change workaround on irq %d\n", spi->irq);
+ err = request_irq(spi->irq, ads7846_irq,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ spi->dev.driver->name, ts);
+ if (err) {
+ dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
+ goto err_disable_regulator;
+ }
}
err = ads784x_hwmon_register(spi, ts);
ads784x_hwmon_unregister(spi, ts);
err_free_irq:
free_irq(spi->irq, ts);
+ err_disable_regulator:
+ regulator_disable(ts->reg);
+ err_put_regulator:
+ regulator_put(ts->reg);
err_free_gpio:
if (ts->gpio_pendown != -1)
gpio_free(ts->gpio_pendown);
/* suspend left the IRQ disabled */
enable_irq(ts->spi->irq);
+ regulator_disable(ts->reg);
+ regulator_put(ts->reg);
+
if (ts->gpio_pendown != -1)
gpio_free(ts->gpio_pendown);
MODULE_DESCRIPTION("ADS7846 TouchScreen Driver");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("spi:ads7846");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff