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Message-Id: <20250519085744.3116042-1-qijian.guo@nxp.com>
Date: Mon, 19 May 2025 17:57:43 +0900
From: Joseph Guo <qijian.guo@....com>
To: Bastien Nocera <hadess@...ess.net>,
Hans de Goede <hdegoede@...hat.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
linux-input@...r.kernel.org (open list:GOODIX TOUCHSCREEN),
linux-kernel@...r.kernel.org (open list)
Cc: qijian.guo@....com
Subject: [PATCH] input: goodix: add poll mode for goodix touchscreen
goodix touchscreen only support interrupt mode by default.
Some panels like waveshare panel which is widely used on raspeberry pi
don't have interrupt pins and only work on i2c poll mode.
The waveshare panel 7inch panel use goodix gt911 touchscreen chip.
Update goodix touchscreen to support both interrupt and poll mode.
Signed-off-by: Joseph Guo <qijian.guo@....com>
---
drivers/input/touchscreen/goodix.c | 69 +++++++++++++++++++++++++++---
drivers/input/touchscreen/goodix.h | 4 ++
2 files changed, 67 insertions(+), 6 deletions(-)
diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index aaf79ac50004..87991b56494d 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -47,6 +47,7 @@
#define RESOLUTION_LOC 1
#define MAX_CONTACTS_LOC 5
#define TRIGGER_LOC 6
+#define POLL_INTERVAL_MS 17 /* 17ms = 60fps */
/* Our special handling for GPIO accesses through ACPI is x86 specific */
#if defined CONFIG_X86 && defined CONFIG_ACPI
@@ -497,6 +498,23 @@ static void goodix_process_events(struct goodix_ts_data *ts)
input_sync(ts->input_dev);
}
+static void goodix_ts_irq_poll_timer(struct timer_list *t)
+{
+ struct goodix_ts_data *ts = from_timer(ts, t, timer);
+
+ schedule_work(&ts->work_i2c_poll);
+ mod_timer(&ts->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));
+}
+
+static void goodix_ts_work_i2c_poll(struct work_struct *work)
+{
+ struct goodix_ts_data *ts = container_of(work,
+ struct goodix_ts_data, work_i2c_poll);
+
+ goodix_process_events(ts);
+ goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0);
+}
+
/**
* goodix_ts_irq_handler - The IRQ handler
*
@@ -523,16 +541,50 @@ static irqreturn_t goodix_ts_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
+static void goodix_enable_irq(struct goodix_ts_data *ts)
+{
+ if (ts->client->irq) {
+ enable_irq(ts->client->irq);
+ } else {
+ ts->timer.expires = jiffies + msecs_to_jiffies(POLL_INTERVAL_MS);
+ add_timer(&ts->timer);
+ }
+}
+
+static void goodix_disable_irq(struct goodix_ts_data *ts)
+{
+ if (ts->client->irq) {
+ disable_irq(ts->client->irq);
+ } else {
+ del_timer(&ts->timer);
+ cancel_work_sync(&ts->work_i2c_poll);
+ }
+}
+
static void goodix_free_irq(struct goodix_ts_data *ts)
{
- devm_free_irq(&ts->client->dev, ts->client->irq, ts);
+ if (ts->client->irq) {
+ devm_free_irq(&ts->client->dev, ts->client->irq, ts);
+ } else {
+ del_timer(&ts->timer);
+ cancel_work_sync(&ts->work_i2c_poll);
+ }
}
static int goodix_request_irq(struct goodix_ts_data *ts)
{
- return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
- NULL, goodix_ts_irq_handler,
- ts->irq_flags, ts->client->name, ts);
+ if (ts->client->irq) {
+ return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
+ NULL, goodix_ts_irq_handler,
+ ts->irq_flags, ts->client->name, ts);
+ } else {
+ INIT_WORK(&ts->work_i2c_poll,
+ goodix_ts_work_i2c_poll);
+ timer_setup(&ts->timer, goodix_ts_irq_poll_timer, 0);
+ if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE)
+ goodix_enable_irq(ts);
+ return 0;
+ }
}
static int goodix_check_cfg_8(struct goodix_ts_data *ts, const u8 *cfg, int len)
@@ -1420,6 +1472,11 @@ static void goodix_ts_remove(struct i2c_client *client)
{
struct goodix_ts_data *ts = i2c_get_clientdata(client);
+ if (!client->irq) {
+ del_timer(&ts->timer);
+ cancel_work_sync(&ts->work_i2c_poll);
+ }
+
if (ts->load_cfg_from_disk)
wait_for_completion(&ts->firmware_loading_complete);
}
@@ -1435,7 +1492,7 @@ static int goodix_suspend(struct device *dev)
/* We need gpio pins to suspend/resume */
if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
- disable_irq(client->irq);
+ goodix_disable_irq(ts);
return 0;
}
@@ -1479,7 +1536,7 @@ static int goodix_resume(struct device *dev)
int error;
if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
- enable_irq(client->irq);
+ goodix_enable_irq(ts);
return 0;
}
diff --git a/drivers/input/touchscreen/goodix.h b/drivers/input/touchscreen/goodix.h
index 87797cc88b32..132e49d66324 100644
--- a/drivers/input/touchscreen/goodix.h
+++ b/drivers/input/touchscreen/goodix.h
@@ -56,6 +56,7 @@
#define GOODIX_ID_MAX_LEN 4
#define GOODIX_CONFIG_MAX_LENGTH 240
#define GOODIX_MAX_KEYS 7
+#define GOODIX_NAME_MAX_LEN 38
enum goodix_irq_pin_access_method {
IRQ_PIN_ACCESS_NONE,
@@ -91,6 +92,7 @@ struct goodix_ts_data {
enum gpiod_flags gpiod_rst_flags;
char id[GOODIX_ID_MAX_LEN + 1];
char cfg_name[64];
+ char name[GOODIX_NAME_MAX_LEN];
u16 version;
bool reset_controller_at_probe;
bool load_cfg_from_disk;
@@ -104,6 +106,8 @@ struct goodix_ts_data {
u8 main_clk[GOODIX_MAIN_CLK_LEN];
int bak_ref_len;
u8 *bak_ref;
+ struct timer_list timer;
+ struct work_struct work_i2c_poll;
};
int goodix_i2c_read(struct i2c_client *client, u16 reg, u8 *buf, int len);
--
2.34.1
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