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Message-Id: <20211027181350.91630-7-nikita@trvn.ru>
Date: Wed, 27 Oct 2021 23:13:50 +0500
From: Nikita Travkin <nikita@...n.ru>
To: dmitry.torokhov@...il.com
Cc: robh+dt@...nel.org, Michael.Srba@...nam.cz,
linus.walleij@...aro.org, broonie@...nel.org,
linux-input@...r.kernel.org, devicetree@...r.kernel.org,
phone-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
~postmarketos/upstreaming@...ts.sr.ht,
Nikita Travkin <nikita@...n.ru>
Subject: [PATCH 6/6] input: touchscreen: zinitix: Add touchkey support
Zinitix touch controllers can use some of the sense lines for virtual
keys (like those found on many phones). Add support for those keys.
Signed-off-by: Nikita Travkin <nikita@...n.ru>
---
drivers/input/touchscreen/zinitix.c | 61 +++++++++++++++++++++++++++--
1 file changed, 58 insertions(+), 3 deletions(-)
diff --git a/drivers/input/touchscreen/zinitix.c b/drivers/input/touchscreen/zinitix.c
index c67ff8be0df1..3928cb743a1c 100644
--- a/drivers/input/touchscreen/zinitix.c
+++ b/drivers/input/touchscreen/zinitix.c
@@ -119,6 +119,7 @@
#define DEFAULT_TOUCH_POINT_MODE 2
#define MAX_SUPPORTED_FINGER_NUM 5
+#define MAX_SUPPORTED_BUTTON_NUM 8
#define CHIP_ON_DELAY 15 // ms
#define FIRMWARE_ON_DELAY 40 // ms
@@ -146,6 +147,8 @@ struct bt541_ts_data {
struct touchscreen_properties prop;
struct regulator_bulk_data supplies[2];
u32 zinitix_mode;
+ u32 keycodes[MAX_SUPPORTED_BUTTON_NUM];
+ int num_keycodes;
};
static int zinitix_read_data(struct i2c_client *client,
@@ -195,6 +198,7 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
struct i2c_client *client = bt541->client;
int i;
int error;
+ u16 int_flags = 0;
error = zinitix_write_cmd(client, BT541_SWRESET_CMD);
if (error) {
@@ -225,6 +229,11 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
if (error)
return error;
+ error = zinitix_write_u16(client, BT541_BUTTON_SUPPORTED_NUM,
+ bt541->num_keycodes);
+ if (error)
+ return error;
+
error = zinitix_write_u16(client, BT541_INITIAL_TOUCH_MODE,
bt541->zinitix_mode);
if (error)
@@ -235,9 +244,12 @@ static int zinitix_init_touch(struct bt541_ts_data *bt541)
if (error)
return error;
- error = zinitix_write_u16(client, BT541_INT_ENABLE_FLAG,
- BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE |
- BIT_UP);
+ int_flags = BIT_PT_CNT_CHANGE | BIT_DOWN | BIT_MOVE | BIT_UP;
+
+ if (bt541->num_keycodes)
+ int_flags |= BIT_ICON_EVENT;
+
+ error = zinitix_write_u16(client, BT541_INT_ENABLE_FLAG, int_flags);
if (error)
return error;
@@ -329,6 +341,15 @@ static void zinitix_report_finger(struct bt541_ts_data *bt541, int slot,
input_report_abs(bt541->input_dev, ABS_MT_TOUCH_MAJOR, p->width);
}
+static void zinitix_report_keys(struct bt541_ts_data *bt541, __le16 icon_events)
+{
+ int i;
+
+ for (i = 0; i < bt541->num_keycodes; i++)
+ input_report_key(bt541->input_dev,
+ bt541->keycodes[i], !!(icon_events & BIT(i)));
+}
+
static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
{
struct bt541_ts_data *bt541 = bt541_handler;
@@ -336,6 +357,7 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
struct touch_event touch_event;
int error;
int i;
+ __le16 icon_events = 0;
memset(&touch_event, 0, sizeof(struct touch_event));
@@ -346,6 +368,17 @@ static irqreturn_t zinitix_ts_irq_handler(int irq, void *bt541_handler)
goto out;
}
+ if (touch_event.status & BIT_ICON_EVENT) {
+ error = zinitix_read_data(bt541->client, BT541_ICON_STATUS_REG,
+ &icon_events, sizeof(icon_events));
+ if (error) {
+ dev_err(&client->dev, "Failed to read icon events\n");
+ goto out;
+ }
+
+ zinitix_report_keys(bt541, icon_events);
+ }
+
for (i = 0; i < MAX_SUPPORTED_FINGER_NUM; i++)
if (touch_event.point_coord[i].sub_status & SUB_BIT_EXIST)
zinitix_report_finger(bt541, i,
@@ -427,6 +460,7 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
{
struct input_dev *input_dev;
int error;
+ int i;
input_dev = devm_input_allocate_device(&bt541->client->dev);
if (!input_dev) {
@@ -444,6 +478,14 @@ static int zinitix_init_input_dev(struct bt541_ts_data *bt541)
input_dev->open = zinitix_input_open;
input_dev->close = zinitix_input_close;
+ if (bt541->num_keycodes) {
+ input_dev->keycode = bt541->keycodes;
+ input_dev->keycodemax = bt541->num_keycodes;
+ input_dev->keycodesize = sizeof(bt541->keycodes[0]);
+ for (i = 0; i < bt541->num_keycodes; i++)
+ input_set_capability(input_dev, EV_KEY, bt541->keycodes[i]);
+ }
+
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
input_set_abs_params(input_dev, ABS_MT_WIDTH_MAJOR, 0, 255, 0, 0);
@@ -508,6 +550,19 @@ static int zinitix_ts_probe(struct i2c_client *client)
return error;
}
+ bt541->num_keycodes = of_property_read_variable_u32_array(
+ client->dev.of_node, "linux,keycodes",
+ bt541->keycodes, 0,
+ ARRAY_SIZE(bt541->keycodes));
+ if (bt541->num_keycodes == -EINVAL) {
+ bt541->num_keycodes = 0;
+ } else if (bt541->num_keycodes < 0) {
+ dev_err(&client->dev,
+ "Unable to parse \"linux,keycodes\" property: %d\n",
+ bt541->num_keycodes);
+ return bt541->num_keycodes;
+ }
+
error = zinitix_init_input_dev(bt541);
if (error) {
dev_err(&client->dev,
--
2.30.2
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