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From d7763e8128b7697f5521e08f097f455d20aab5be Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Fri, 6 Nov 2020 18:45:10 +0000
Subject: [PATCH] Input: edt-ft5x06: Poll the device if no interrupt is
configured.
Not all systems have the interrupt line wired up, so switch to
polling the touchscreen off a timer if no interrupt line is
configured.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
drivers/input/touchscreen/edt-ft5x06.c | 51 +++++++++++++++++++++-----
1 file changed, 41 insertions(+), 10 deletions(-)
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -69,6 +69,8 @@
#define EDT_RAW_DATA_RETRIES 100
#define EDT_RAW_DATA_DELAY 1000 /* usec */
+#define POLL_INTERVAL_MS 17 /* 17ms = 60fps */
+
enum edt_pmode {
EDT_PMODE_NOT_SUPPORTED,
EDT_PMODE_HIBERNATE,
@@ -126,6 +128,9 @@ struct edt_ft5x06_ts_data {
struct edt_reg_addr reg_addr;
enum edt_ver version;
+
+ struct timer_list timer;
+ struct work_struct work_i2c_poll;
};
struct edt_i2c_chip_data {
@@ -275,6 +280,22 @@ out:
return IRQ_HANDLED;
}
+static void edt_ft5x06_ts_irq_poll_timer(struct timer_list *t)
+{
+ struct edt_ft5x06_ts_data *tsdata = from_timer(tsdata, t, timer);
+
+ schedule_work(&tsdata->work_i2c_poll);
+ mod_timer(&tsdata->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));
+}
+
+static void edt_ft5x06_ts_work_i2c_poll(struct work_struct *work)
+{
+ struct edt_ft5x06_ts_data *tsdata = container_of(work,
+ struct edt_ft5x06_ts_data, work_i2c_poll);
+
+ edt_ft5x06_ts_isr(0, tsdata);
+}
+
static int edt_ft5x06_register_write(struct edt_ft5x06_ts_data *tsdata,
u8 addr, u8 value)
{
@@ -1221,17 +1242,27 @@ static int edt_ft5x06_ts_probe(struct i2
i2c_set_clientdata(client, tsdata);
- irq_flags = irq_get_trigger_type(client->irq);
- if (irq_flags == IRQF_TRIGGER_NONE)
- irq_flags = IRQF_TRIGGER_FALLING;
- irq_flags |= IRQF_ONESHOT;
-
- error = devm_request_threaded_irq(&client->dev, client->irq,
- NULL, edt_ft5x06_ts_isr, irq_flags,
- client->name, tsdata);
- if (error) {
- dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
- return error;
+ if (client->irq) {
+ irq_flags = irq_get_trigger_type(client->irq);
+ if (irq_flags == IRQF_TRIGGER_NONE)
+ irq_flags = IRQF_TRIGGER_FALLING;
+ irq_flags |= IRQF_ONESHOT;
+
+ error = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, edt_ft5x06_ts_isr,
+ irq_flags, client->name,
+ tsdata);
+ if (error) {
+ dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
+ return error;
+ }
+ } else {
+ INIT_WORK(&tsdata->work_i2c_poll,
+ edt_ft5x06_ts_work_i2c_poll);
+ timer_setup(&tsdata->timer, edt_ft5x06_ts_irq_poll_timer, 0);
+ tsdata->timer.expires = jiffies +
+ msecs_to_jiffies(POLL_INTERVAL_MS);
+ add_timer(&tsdata->timer);
}
error = devm_device_add_group(&client->dev, &edt_ft5x06_attr_group);
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