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Input: msg2638 - add support for msg2138 key events

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Some devices with msg2138 have back/menu/home keys.
Add support for them.

Signed-off-by: Vincent Knecht <vincent.knecht@mailoo.org>
Link: https://lore.kernel.org/r/20221116211622.2155747-3-vincent.knecht@mailoo.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Vincent Knecht 2022-11-16 15:49:15 -08:00 committed by Dmitry Torokhov
parent 8f076b98f1
commit c18ef50346
1 changed files with 58 additions and 4 deletions
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62
drivers/input/touchscreen/msg2638.c
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@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
@ -29,6 +30,8 @@
#define MSG2138_MAX_FINGERS 2
#define MSG2638_MAX_FINGERS 5
#define MAX_BUTTONS 4
#define CHIP_ON_DELAY_MS 15
#define FIRMWARE_ON_DELAY_MS 50
#define RESET_DELAY_MIN_US 10000
@ -72,6 +75,8 @@ struct msg2638_ts_data {
struct regulator_bulk_data supplies[2];
struct gpio_desc *reset_gpiod;
int max_fingers;
u32 keycodes[MAX_BUTTONS];
int num_keycodes;
};
static u8 msg2638_checksum(u8 *data, u32 length)
@ -85,6 +90,19 @@ static u8 msg2638_checksum(u8 *data, u32 length)
return (u8)((-sum) & 0xFF);
}
static void msg2138_report_keys(struct msg2638_ts_data *msg2638, u8 keys)
{
int i;
/* keys can be 0x00 or 0xff when all keys have been released */
if (keys == 0xff)
keys = 0;
for (i = 0; i < msg2638->num_keycodes; ++i)
input_report_key(msg2638->input_dev, msg2638->keycodes[i],
keys & BIT(i));
}
static irqreturn_t msg2138_ts_irq_handler(int irq, void *msg2638_handler)
{
struct msg2638_ts_data *msg2638 = msg2638_handler;
@ -121,9 +139,12 @@ static irqreturn_t msg2138_ts_irq_handler(int irq, void *msg2638_handler)
p0 = &touch_event.pkt[0];
p1 = &touch_event.pkt[1];
/* Ignore non-pressed finger data */
if (p0->xy_hi == 0xFF && p0->x_low == 0xFF && p0->y_low == 0xFF)
/* Ignore non-pressed finger data, but check for key code */
if (p0->xy_hi == 0xFF && p0->x_low == 0xFF && p0->y_low == 0xFF) {
if (p1->xy_hi == 0xFF && p1->y_low == 0xFF)
msg2138_report_keys(msg2638, p1->x_low);
goto report;
}
x = ((p0->xy_hi & 0xF0) << 4) | p0->x_low;
y = ((p0->xy_hi & 0x0F) << 8) | p0->y_low;
@ -283,6 +304,7 @@ static int msg2638_init_input_dev(struct msg2638_ts_data *msg2638)
struct device *dev = &msg2638->client->dev;
struct input_dev *input_dev;
int error;
int i;
input_dev = devm_input_allocate_device(dev);
if (!input_dev) {
@ -299,6 +321,15 @@ static int msg2638_init_input_dev(struct msg2638_ts_data *msg2638)
input_dev->open = msg2638_input_open;
input_dev->close = msg2638_input_close;
if (msg2638->num_keycodes) {
input_dev->keycode = msg2638->keycodes;
input_dev->keycodemax = msg2638->num_keycodes;
input_dev->keycodesize = sizeof(msg2638->keycodes[0]);
for (i = 0; i < msg2638->num_keycodes; i++)
input_set_capability(input_dev,
EV_KEY, msg2638->keycodes[i]);
}
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
@ -367,9 +398,26 @@ static int msg2638_ts_probe(struct i2c_client *client)
return error;
}
error = msg2638_init_input_dev(msg2638);
msg2638->num_keycodes = device_property_count_u32(dev,
"linux,keycodes");
if (msg2638->num_keycodes == -EINVAL) {
msg2638->num_keycodes = 0;
} else if (msg2638->num_keycodes < 0) {
dev_err(dev, "Unable to parse linux,keycodes property: %d\n",
msg2638->num_keycodes);
return msg2638->num_keycodes;
} else if (msg2638->num_keycodes > ARRAY_SIZE(msg2638->keycodes)) {
dev_warn(dev, "Found %d linux,keycodes but max is %zd, ignoring the rest\n",
msg2638->num_keycodes, ARRAY_SIZE(msg2638->keycodes));
msg2638->num_keycodes = ARRAY_SIZE(msg2638->keycodes);
}
error = device_property_read_u32_array(dev, "linux,keycodes",
msg2638->keycodes,
msg2638->num_keycodes);
if (error) {
dev_err(dev, "Failed to initialize input device: %d\n", error);
dev_err(dev, "Unable to read linux,keycodes values: %d\n",
error);
return error;
}
@ -382,6 +430,12 @@ static int msg2638_ts_probe(struct i2c_client *client)
return error;
}
error = msg2638_init_input_dev(msg2638);
if (error) {
dev_err(dev, "Failed to initialize input device: %d\n", error);
return error;
}
return 0;
}