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authorMarcin Niestroj <m.niestroj@grinn-global.com>2018-01-26 11:08:59 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2018-01-31 14:44:40 -0800
commitfafef982c7353e8982b951e40573e990ccf0ed00 (patch)
treeac8aed03a26e7579f7fdb8ff7b95665f4d27d8dd
parentInput: mms114 - fix typo in definition (diff)
downloadlinux-dev-fafef982c7353e8982b951e40573e990ccf0ed00.tar.xz
linux-dev-fafef982c7353e8982b951e40573e990ccf0ed00.zip
Input: goodix - use generic touchscreen_properties
Use touchscreen_properties structure instead of implementing all properties by our own. It allows us to reuse generic code for parsing device-tree properties (which was implemented manually in the driver for now). Additionally, it allows us to report events using generic touchscreen_report_pos(), which automatically handles inverted and swapped axes. This fixes the issue with the custom code incorrectly handling case where ts->inverted_x and ts->swapped_x_y were true, but ts->inverted_y was false. Assuming we have 720x1280 touch panel, ts->abs_x_max == 1279 and ts->abs_y_max == 719 (because we inverted that in goodix_read_config()). Now let's assume that we received event from (0:0) position (in touch panel original coordinates). In function goodix_ts_report_touch() we calculate input_x as 1279, but after swapping input_y takes that value (which is more that maximum 719 value reported during initialization). Note that since touchscreen coordinates are 0-indexed, we now report touchscreen range as (0:size-1). Developed and tested on custom DT-based device with gt1151 touch panel. Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com> [dtor: fix endianness annotation reported by sparse, handle errors when initializing MT slots] Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
-rw-r--r--drivers/input/touchscreen/goodix.c141
1 files changed, 58 insertions, 83 deletions
diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index ecec8eb17f28..9736c83dd418 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -22,6 +22,7 @@
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
@@ -43,11 +44,7 @@ struct goodix_ts_data {
struct i2c_client *client;
struct input_dev *input_dev;
const struct goodix_chip_data *chip;
- int abs_x_max;
- int abs_y_max;
- bool swapped_x_y;
- bool inverted_x;
- bool inverted_y;
+ struct touchscreen_properties prop;
unsigned int max_touch_num;
unsigned int int_trigger_type;
struct gpio_desc *gpiod_int;
@@ -160,7 +157,7 @@ static int goodix_i2c_read(struct i2c_client *client,
u16 reg, u8 *buf, int len)
{
struct i2c_msg msgs[2];
- u16 wbuf = cpu_to_be16(reg);
+ __be16 wbuf = cpu_to_be16(reg);
int ret;
msgs[0].flags = 0;
@@ -295,18 +292,10 @@ static void goodix_ts_report_touch(struct goodix_ts_data *ts, u8 *coor_data)
int input_y = get_unaligned_le16(&coor_data[3]);
int input_w = get_unaligned_le16(&coor_data[5]);
- /* Inversions have to happen before axis swapping */
- if (ts->inverted_x)
- input_x = ts->abs_x_max - input_x;
- if (ts->inverted_y)
- input_y = ts->abs_y_max - input_y;
- if (ts->swapped_x_y)
- swap(input_x, input_y);
-
input_mt_slot(ts->input_dev, id);
input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER, true);
- input_report_abs(ts->input_dev, ABS_MT_POSITION_X, input_x);
- input_report_abs(ts->input_dev, ABS_MT_POSITION_Y, input_y);
+ touchscreen_report_pos(ts->input_dev, &ts->prop,
+ input_x, input_y, true);
input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR, input_w);
input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
}
@@ -579,44 +568,27 @@ static int goodix_get_gpio_config(struct goodix_ts_data *ts)
static void goodix_read_config(struct goodix_ts_data *ts)
{
u8 config[GOODIX_CONFIG_MAX_LENGTH];
+ int x_max, y_max;
int error;
error = goodix_i2c_read(ts->client, ts->chip->config_addr,
config, ts->chip->config_len);
if (error) {
- dev_warn(&ts->client->dev,
- "Error reading config (%d), using defaults\n",
+ dev_warn(&ts->client->dev, "Error reading config: %d\n",
error);
- ts->abs_x_max = GOODIX_MAX_WIDTH;
- ts->abs_y_max = GOODIX_MAX_HEIGHT;
- if (ts->swapped_x_y)
- swap(ts->abs_x_max, ts->abs_y_max);
ts->int_trigger_type = GOODIX_INT_TRIGGER;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
return;
}
- ts->abs_x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
- ts->abs_y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
- if (ts->swapped_x_y)
- swap(ts->abs_x_max, ts->abs_y_max);
ts->int_trigger_type = config[TRIGGER_LOC] & 0x03;
ts->max_touch_num = config[MAX_CONTACTS_LOC] & 0x0f;
- if (!ts->abs_x_max || !ts->abs_y_max || !ts->max_touch_num) {
- dev_err(&ts->client->dev,
- "Invalid config, using defaults\n");
- ts->abs_x_max = GOODIX_MAX_WIDTH;
- ts->abs_y_max = GOODIX_MAX_HEIGHT;
- if (ts->swapped_x_y)
- swap(ts->abs_x_max, ts->abs_y_max);
- ts->max_touch_num = GOODIX_MAX_CONTACTS;
- }
- if (dmi_check_system(rotated_screen)) {
- ts->inverted_x = true;
- ts->inverted_y = true;
- dev_dbg(&ts->client->dev,
- "Applying '180 degrees rotated screen' quirk\n");
+ x_max = get_unaligned_le16(&config[RESOLUTION_LOC]);
+ y_max = get_unaligned_le16(&config[RESOLUTION_LOC + 2]);
+ if (x_max && y_max) {
+ input_abs_set_max(ts->input_dev, ABS_MT_POSITION_X, x_max - 1);
+ input_abs_set_max(ts->input_dev, ABS_MT_POSITION_Y, y_max - 1);
}
}
@@ -676,32 +648,28 @@ static int goodix_i2c_test(struct i2c_client *client)
}
/**
- * goodix_request_input_dev - Allocate, populate and register the input device
+ * goodix_configure_dev - Finish device initialization
*
* @ts: our goodix_ts_data pointer
*
- * Must be called during probe
+ * Must be called from probe to finish initialization of the device.
+ * Contains the common initialization code for both devices that
+ * declare gpio pins and devices that do not. It is either called
+ * directly from probe or from request_firmware_wait callback.
*/
-static int goodix_request_input_dev(struct goodix_ts_data *ts)
+static int goodix_configure_dev(struct goodix_ts_data *ts)
{
int error;
+ ts->int_trigger_type = GOODIX_INT_TRIGGER;
+ ts->max_touch_num = GOODIX_MAX_CONTACTS;
+
ts->input_dev = devm_input_allocate_device(&ts->client->dev);
if (!ts->input_dev) {
dev_err(&ts->client->dev, "Failed to allocate input device.");
return -ENOMEM;
}
- input_set_abs_params(ts->input_dev, ABS_MT_POSITION_X,
- 0, ts->abs_x_max, 0, 0);
- input_set_abs_params(ts->input_dev, ABS_MT_POSITION_Y,
- 0, ts->abs_y_max, 0, 0);
- input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
- input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
-
- input_mt_init_slots(ts->input_dev, ts->max_touch_num,
- INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
-
ts->input_dev->name = "Goodix Capacitive TouchScreen";
ts->input_dev->phys = "input/ts";
ts->input_dev->id.bustype = BUS_I2C;
@@ -712,42 +680,49 @@ static int goodix_request_input_dev(struct goodix_ts_data *ts)
/* Capacitive Windows/Home button on some devices */
input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
- error = input_register_device(ts->input_dev);
- if (error) {
- dev_err(&ts->client->dev,
- "Failed to register input device: %d", error);
- return error;
- }
+ input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
+ input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
+ input_set_abs_params(ts->input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
+ input_set_abs_params(ts->input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
- return 0;
-}
+ /* Read configuration and apply touchscreen parameters */
+ goodix_read_config(ts);
-/**
- * goodix_configure_dev - Finish device initialization
- *
- * @ts: our goodix_ts_data pointer
- *
- * Must be called from probe to finish initialization of the device.
- * Contains the common initialization code for both devices that
- * declare gpio pins and devices that do not. It is either called
- * directly from probe or from request_firmware_wait callback.
- */
-static int goodix_configure_dev(struct goodix_ts_data *ts)
-{
- int error;
+ /* Try overriding touchscreen parameters via device properties */
+ touchscreen_parse_properties(ts->input_dev, true, &ts->prop);
- ts->swapped_x_y = device_property_read_bool(&ts->client->dev,
- "touchscreen-swapped-x-y");
- ts->inverted_x = device_property_read_bool(&ts->client->dev,
- "touchscreen-inverted-x");
- ts->inverted_y = device_property_read_bool(&ts->client->dev,
- "touchscreen-inverted-y");
+ if (!ts->prop.max_x || !ts->prop.max_y || !ts->max_touch_num) {
+ dev_err(&ts->client->dev, "Invalid config, using defaults\n");
+ ts->prop.max_x = GOODIX_MAX_WIDTH - 1;
+ ts->prop.max_y = GOODIX_MAX_HEIGHT - 1;
+ ts->max_touch_num = GOODIX_MAX_CONTACTS;
+ input_abs_set_max(ts->input_dev,
+ ABS_MT_POSITION_X, ts->prop.max_x);
+ input_abs_set_max(ts->input_dev,
+ ABS_MT_POSITION_Y, ts->prop.max_y);
+ }
- goodix_read_config(ts);
+ if (dmi_check_system(rotated_screen)) {
+ ts->prop.invert_x = true;
+ ts->prop.invert_y = true;
+ dev_dbg(&ts->client->dev,
+ "Applying '180 degrees rotated screen' quirk\n");
+ }
- error = goodix_request_input_dev(ts);
- if (error)
+ error = input_mt_init_slots(ts->input_dev, ts->max_touch_num,
+ INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+ if (error) {
+ dev_err(&ts->client->dev,
+ "Failed to initialize MT slots: %d", error);
+ return error;
+ }
+
+ error = input_register_device(ts->input_dev);
+ if (error) {
+ dev_err(&ts->client->dev,
+ "Failed to register input device: %d", error);
return error;
+ }
ts->irq_flags = goodix_irq_flags[ts->int_trigger_type] | IRQF_ONESHOT;
error = goodix_request_irq(ts);