This adds DT support to the tsc2005 touchscreen
driver.
Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
---
drivers/input/touchscreen/tsc2005.c | 96 +++++++++++++++++++++++++++++--------
1 file changed, 77 insertions(+), 19 deletions(-)
diff --git a/drivers/input/touchscreen/tsc2005.c b/drivers/input/touchscreen/tsc2005.c
index 9daaddd..a83d1be 100644
--- a/drivers/input/touchscreen/tsc2005.c
+++ b/drivers/input/touchscreen/tsc2005.c
@@ -28,6 +28,8 @@
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/pm.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/tsc2005.h>
@@ -100,6 +102,11 @@
TSC2005_CFR2_AVG_7)
#define MAX_12BIT 0xfff
+#define TSC2005_DEF_X_FUZZ 4
+#define TSC2005_DEF_Y_FUZZ 8
+#define TSC2005_DEF_P_FUZZ 2
+#define TSC2005_DEF_RESISTOR 280
+
#define TSC2005_SPI_MAX_SPEED_HZ 10000000
#define TSC2005_PENUP_TIME_MS 40
@@ -143,6 +150,7 @@ struct tsc2005 {
bool pen_down;
+ int reset_gpio;
void (*set_reset)(bool enable);
};
@@ -337,6 +345,14 @@ static void tsc2005_stop_scan(struct tsc2005 *ts)
tsc2005_cmd(ts, TSC2005_CMD_STOP);
}
+static void tsc2005_set_reset(struct tsc2005 *ts, bool enable)
+{
+ if (ts->reset_gpio >= 0)
+ gpio_set_value(ts->reset_gpio, enable);
+ else if (ts->set_reset)
+ ts->set_reset(enable);
+}
+
/* must be called with ts->mutex held */
static void __tsc2005_disable(struct tsc2005 *ts)
{
@@ -355,7 +371,7 @@ static void __tsc2005_enable(struct tsc2005 *ts)
{
tsc2005_start_scan(ts);
- if (ts->esd_timeout && ts->set_reset) {
+ if (ts->esd_timeout && (ts->set_reset || ts->reset_gpio)) {
ts->last_valid_interrupt = jiffies;
schedule_delayed_work(&ts->esd_work,
round_jiffies_relative(
@@ -414,9 +430,9 @@ static ssize_t tsc2005_selftest_show(struct device *dev,
}
/* hardware reset */
- ts->set_reset(false);
+ tsc2005_set_reset(ts, false);
usleep_range(100, 500); /* only 10us required */
- ts->set_reset(true);
+ tsc2005_set_reset(ts, true);
if (!success)
goto out;
@@ -459,7 +475,7 @@ static umode_t tsc2005_attr_is_visible(struct kobject *kobj,
umode_t mode = attr->mode;
if (attr == &dev_attr_selftest.attr) {
- if (!ts->set_reset)
+ if (!ts->set_reset && !ts->reset_gpio)
mode = 0;
}
@@ -509,9 +525,9 @@ static void tsc2005_esd_work(struct work_struct *work)
tsc2005_update_pen_state(ts, 0, 0, 0);
- ts->set_reset(false);
+ tsc2005_set_reset(ts, false);
usleep_range(100, 500); /* only 10us required */
- ts->set_reset(true);
+ tsc2005_set_reset(ts, true);
enable_irq(ts->spi->irq);
tsc2005_start_scan(ts);
@@ -572,29 +588,47 @@ static void tsc2005_setup_spi_xfer(struct tsc2005 *ts)
static int tsc2005_probe(struct spi_device *spi)
{
const struct tsc2005_platform_data *pdata = dev_get_platdata(&spi->dev);
+ struct device_node *np = spi->dev.of_node;
+
struct tsc2005 *ts;
struct input_dev *input_dev;
- unsigned int max_x, max_y, max_p;
- unsigned int fudge_x, fudge_y, fudge_p;
+ unsigned int max_x = MAX_12BIT;
+ unsigned int max_y = MAX_12BIT;
+ unsigned int max_p = MAX_12BIT;
+ unsigned int fudge_x = TSC2005_DEF_X_FUZZ;
+ unsigned int fudge_y = TSC2005_DEF_Y_FUZZ;
+ unsigned int fudge_p = TSC2005_DEF_P_FUZZ;
+ unsigned int x_plate_ohm = TSC2005_DEF_RESISTOR;
+ unsigned int esd_timeout;
int error;
- if (!pdata) {
+ if (!np && !pdata) {
dev_err(&spi->dev, "no platform data\n");
return -ENODEV;
}
- fudge_x = pdata->ts_x_fudge ? : 4;
- fudge_y = pdata->ts_y_fudge ? : 8;
- fudge_p = pdata->ts_pressure_fudge ? : 2;
- max_x = pdata->ts_x_max ? : MAX_12BIT;
- max_y = pdata->ts_y_max ? : MAX_12BIT;
- max_p = pdata->ts_pressure_max ? : MAX_12BIT;
-
if (spi->irq <= 0) {
dev_err(&spi->dev, "no irq\n");
return -ENODEV;
}
+ if (pdata) {
+ fudge_x = pdata->ts_x_fudge;
+ fudge_y = pdata->ts_y_fudge;
+ fudge_p = pdata->ts_pressure_fudge;
+ max_x = pdata->ts_x_max;
+ max_y = pdata->ts_y_max;
+ max_p = pdata->ts_pressure_max;
+ x_plate_ohm = pdata->ts_x_plate_ohm;
+ esd_timeout = pdata->esd_timeout_ms;
+ } else {
+ x_plate_ohm = TSC2005_DEF_RESISTOR;
+ of_property_read_u32(np, "ti,x-plate-ohms", &x_plate_ohm);
+ esd_timeout = 0;
+ of_property_read_u32(np, "ti,esd-recovery-timeout-ms",
+ &esd_timeout);
+ }
+
spi->mode = SPI_MODE_0;
spi->bits_per_word = 8;
if (!spi->max_speed_hz)
@@ -612,9 +646,30 @@ static int tsc2005_probe(struct spi_device *spi)
ts->spi = spi;
ts->idev = input_dev;
- ts->x_plate_ohm = pdata->ts_x_plate_ohm ? : 280;
- ts->esd_timeout = pdata->esd_timeout_ms;
- ts->set_reset = pdata->set_reset;
+ ts->x_plate_ohm = x_plate_ohm;
+ ts->esd_timeout = esd_timeout;
+
+ if (np) {
+ ts->reset_gpio = of_get_named_gpio(np, "reset-gpios", 0);
+ if (ts->reset_gpio == -EPROBE_DEFER)
+ return ts->reset_gpio;
+ if (ts->reset_gpio < 0) {
+ dev_err(&spi->dev, "error acquiring reset gpio: %d\n",
+ ts->reset_gpio);
+ return ts->reset_gpio;
+ }
+
+ error = devm_gpio_request_one(&spi->dev, ts->reset_gpio, 0,
+ "reset-gpios");
+ if (error) {
+ dev_err(&spi->dev, "error requesting reset gpio: %d\n",
+ error);
+ return error;
+ }
+ } else {
+ ts->reset_gpio = -1;
+ ts->set_reset = pdata->set_reset;
+ }
mutex_init(&ts->mutex);
@@ -639,6 +694,9 @@ static int tsc2005_probe(struct spi_device *spi)
input_set_abs_params(input_dev, ABS_Y, 0, max_y, fudge_y, 0);
input_set_abs_params(input_dev, ABS_PRESSURE, 0, max_p, fudge_p, 0);
+ if (np)
+ input_parse_touchscreen_of_params(input_dev);
+
input_dev->open = tsc2005_open;
input_dev->close = tsc2005_close;
--
1.9.2
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