(ADS7846).
ti,keep-vref-on set to keep vref on for differential
measurements as well
- ti,swap-xy swap x and y axis
ti,settle-delay-usec Settling time of the analog signals;
a function of Vcc and the capacitance
on the X/Y drivers. If set to non-zero,
in Ohms (u16).
ti,x-min Minimum value on the X axis (u16).
ti,y-min Minimum value on the Y axis (u16).
- ti,x-max Maximum value on the X axis (u16).
- ti,y-max Maximum value on the Y axis (u16).
- ti,pressure-min Minimum reported pressure value
- (threshold) - u16.
- ti,pressure-max Maximum reported pressure value (u16).
- ti,debounce-max Max number of additional readings per
- sample (u16).
ti,debounce-tol Tolerance used for filtering (u16).
ti,debounce-rep Additional consecutive good readings
required after the first two (u16).
line is connected to.
wakeup-source use any event on touchscreen as wakeup event.
(Legacy property support: "linux,wakeup")
+ touchscreen-size-x General touchscreen binding, see [1].
+ touchscreen-size-y General touchscreen binding, see [1].
+ touchscreen-max-pressure General touchscreen binding, see [1].
+ touchscreen-min-pressure General touchscreen binding, see [1].
+ touchscreen-average-samples General touchscreen binding, see [1].
+ touchscreen-inverted-x General touchscreen binding, see [1].
+ touchscreen-inverted-y General touchscreen binding, see [1].
+ touchscreen-swapped-x-y General touchscreen binding, see [1].
+
+[1] All general touchscreen properties are described in
+ Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt.
+Deprecated properties:
+
+ ti,swap-xy swap x and y axis
+ ti,x-max Maximum value on the X axis (u16).
+ ti,y-max Maximum value on the Y axis (u16).
+ ti,pressure-min Minimum reported pressure value
+ (threshold) - u16.
+ ti,pressure-max Maximum reported pressure value (u16).
+ ti,debounce-max Max number of additional readings per
+ sample (u16).
Example for a TSC2046 chip connected to an McSPI controller of an OMAP SoC::
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/input.h>
+#include <linux/input/touchscreen.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/pm.h>
u16 penirq_recheck_delay_usecs;
+ struct touchscreen_properties core_prop;
+
struct mutex lock;
bool stopped; /* P: lock */
bool disabled; /* P: lock */
if (Rt) {
struct input_dev *input = ts->input;
- if (ts->swap_xy)
- swap(x, y);
-
if (!ts->pendown) {
input_report_key(input, BTN_TOUCH, 1);
ts->pendown = true;
dev_vdbg(&ts->spi->dev, "DOWN\n");
}
- input_report_abs(input, ABS_X, x);
- input_report_abs(input, ABS_Y, y);
+ touchscreen_report_pos(input, &ts->core_prop, x, y, false);
input_report_abs(input, ABS_PRESSURE, ts->pressure_max - Rt);
input_sync(input);
struct ads7846_platform_data *pdata;
struct device_node *node = dev->of_node;
const struct of_device_id *match;
+ u32 value;
if (!node) {
dev_err(dev, "Device does not have associated DT data\n");
of_property_read_u16(node, "ti,x-max", &pdata->x_max);
of_property_read_u16(node, "ti,y-max", &pdata->y_max);
+ /*
+ * touchscreen-max-pressure gets parsed during
+ * touchscreen_parse_properties()
+ */
of_property_read_u16(node, "ti,pressure-min", &pdata->pressure_min);
+ if (!of_property_read_u32(node, "touchscreen-min-pressure", &value))
+ pdata->pressure_min = (u16) value;
of_property_read_u16(node, "ti,pressure-max", &pdata->pressure_max);
of_property_read_u16(node, "ti,debounce-max", &pdata->debounce_max);
+ if (!of_property_read_u32(node, "touchscreen-average-samples", &value))
+ pdata->debounce_max = (u16) value;
of_property_read_u16(node, "ti,debounce-tol", &pdata->debounce_tol);
of_property_read_u16(node, "ti,debounce-rep", &pdata->debounce_rep);
ts->model = pdata->model ? : 7846;
ts->vref_delay_usecs = pdata->vref_delay_usecs ? : 100;
ts->x_plate_ohms = pdata->x_plate_ohms ? : 400;
- ts->pressure_max = pdata->pressure_max ? : ~0;
-
ts->vref_mv = pdata->vref_mv;
- ts->swap_xy = pdata->swap_xy;
if (pdata->filter != NULL) {
if (pdata->filter_init != NULL) {
input_set_abs_params(input_dev, ABS_PRESSURE,
pdata->pressure_min, pdata->pressure_max, 0, 0);
+ /*
+ * Parse common framework properties. Must be done here to ensure the
+ * correct behaviour in case of using the legacy vendor bindings. The
+ * general binding value overrides the vendor specific one.
+ */
+ touchscreen_parse_properties(ts->input, false, &ts->core_prop);
+ ts->pressure_max = input_abs_get_max(input_dev, ABS_PRESSURE) ? : ~0;
+
+ /*
+ * Check if legacy ti,swap-xy binding is used instead of
+ * touchscreen-swapped-x-y
+ */
+ if (!ts->core_prop.swap_x_y && pdata->swap_xy) {
+ swap(input_dev->absinfo[ABS_X], input_dev->absinfo[ABS_Y]);
+ ts->core_prop.swap_x_y = true;
+ }
+
ads7846_setup_spi_msg(ts, pdata);
ts->reg = regulator_get(&spi->dev, "vcc");