@@ -137,7 +137,6 @@
/**
* struct bu21013_ts - touch panel data structure
* @client: pointer to the i2c client
- * @wait: variable to wait_queue_head_t structure
* @touch_stopped: touch stop flag
* @chip: pointer to the touch panel controller
* @in_dev: pointer to the input device structure
@@ -149,7 +148,6 @@
*/
struct bu21013_ts {
struct i2c_client *client;
- wait_queue_head_t wait;
const struct bu21013_platform_device *chip;
struct input_dev *in_dev;
struct regulator *regulator;
@@ -242,11 +240,13 @@ static irqreturn_t bu21013_gpio_irq(int irq, void *device_data)
break;
}
+ if (unlikely(ts->touch_stopped))
+ break;
+
keep_polling = gpiod_get_value(ts->int_gpiod);
if (keep_polling)
- wait_event_timeout(ts->wait, ts->touch_stopped,
- msecs_to_jiffies(2));
- } while (keep_polling && !ts->touch_stopped);
+ usleep_range(2000, 2500);
+ } while (keep_polling);
return IRQ_HANDLED;
}
@@ -388,20 +388,6 @@ static int bu21013_init_chip(struct bu21013_ts *ts)
return 0;
}
-/**
- * bu21013_free_irq() - frees IRQ registered for touchscreen
- * @ts: device structure pointer
- *
- * This function signals interrupt thread to stop processing and
- * frees interrupt.
- */
-static void bu21013_free_irq(struct bu21013_ts *ts)
-{
- ts->touch_stopped = true;
- wake_up(&ts->wait);
- free_irq(ts->irq, ts);
-}
-
#ifdef CONFIG_OF
static const struct bu21013_platform_device *
bu21013_parse_dt(struct device *dev)
@@ -439,6 +425,20 @@ bu21013_parse_dt(struct device *dev)
}
#endif
+static void bu21013_power_off(void *_ts)
+{
+ struct bu21013_ts *ts = ts;
+
+ regulator_disable(ts->regulator);
+}
+
+static void bu21013_disable_chip(void *_ts)
+{
+ struct bu21013_ts *ts = ts;
+
+ gpiod_set_value(ts->cs_gpiod, 0);
+}
+
static int bu21013_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -460,133 +460,119 @@ static int bu21013_probe(struct i2c_client *client,
return PTR_ERR(pdata);
}
- ts = kzalloc(sizeof(*ts), GFP_KERNEL);
- in_dev = input_allocate_device();
- if (!ts || !in_dev) {
+ ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
+ if (!ts)
+ return -ENOMEM;
+
+ ts->chip = pdata;
+ ts->client = client;
+
+ in_dev = devm_input_allocate_device(&client->dev);
+ if (!in_dev) {
dev_err(&client->dev, "device memory alloc failed\n");
- error = -ENOMEM;
- goto err_free_mem;
+ return -ENOMEM;
}
+ ts->in_dev = in_dev;
- /* Named "INT" on the chip, DT binding is "touch" */
- ts->int_gpiod = gpiod_get(&client->dev, "touch", GPIOD_IN);
- error = PTR_ERR_OR_ZERO(ts->int_gpiod);
- if (error) {
- if (error != -EPROBE_DEFER)
- dev_err(&client->dev, "failed to get INT GPIO\n");
- goto err_free_mem;
- }
- gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT");
+ /* register the device to input subsystem */
+ in_dev->name = DRIVER_TP;
+ in_dev->id.bustype = BUS_I2C;
- ts->in_dev = in_dev;
- ts->chip = pdata;
- ts->client = client;
- ts->irq = gpiod_to_irq(ts->int_gpiod);
+ __set_bit(EV_SYN, in_dev->evbit);
+ __set_bit(EV_KEY, in_dev->evbit);
+ __set_bit(EV_ABS, in_dev->evbit);
+
+ input_set_abs_params(in_dev, ABS_MT_POSITION_X,
+ 0, pdata->touch_x_max, 0, 0);
+ input_set_abs_params(in_dev, ABS_MT_POSITION_Y,
+ 0, pdata->touch_y_max, 0, 0);
+ input_set_drvdata(in_dev, ts);
- ts->regulator = regulator_get(&client->dev, "avdd");
+ ts->regulator = devm_regulator_get(&client->dev, "avdd");
if (IS_ERR(ts->regulator)) {
dev_err(&client->dev, "regulator_get failed\n");
- error = PTR_ERR(ts->regulator);
- goto err_put_int_gpio;
+ return PTR_ERR(ts->regulator);
}
error = regulator_enable(ts->regulator);
- if (error < 0) {
+ if (error) {
dev_err(&client->dev, "regulator enable failed\n");
- goto err_put_regulator;
+ return error;
}
- ts->touch_stopped = false;
- init_waitqueue_head(&ts->wait);
+ error = devm_add_action_or_reset(&client->dev, bu21013_power_off, ts);
+ if (error) {
+ dev_err(&client->dev, "failed to install power off handler\n");
+ return error;
+ }
/* Named "CS" on the chip, DT binding is "reset" */
- ts->cs_gpiod = gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
+ ts->cs_gpiod = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
error = PTR_ERR_OR_ZERO(ts->cs_gpiod);
if (error) {
if (error != -EPROBE_DEFER)
dev_err(&client->dev, "failed to get CS GPIO\n");
- goto err_disable_regulator;
+ return error;
}
gpiod_set_consumer_name(ts->cs_gpiod, "BU21013 CS");
+ error = devm_add_action_or_reset(&client->dev,
+ bu21013_disable_chip, ts);
+ if (error) {
+ dev_err(&client->dev,
+ "failed to install chip disable handler\n");
+ return error;
+ }
+
+ /* Named "INT" on the chip, DT binding is "touch" */
+ ts->int_gpiod = devm_gpiod_get(&client->dev, "touch", GPIOD_IN);
+ error = PTR_ERR_OR_ZERO(ts->int_gpiod);
+ if (error) {
+ if (error != -EPROBE_DEFER)
+ dev_err(&client->dev, "failed to get INT GPIO\n");
+ return error;
+ }
+ gpiod_set_consumer_name(ts->int_gpiod, "BU21013 INT");
+
/* configure the touch panel controller */
error = bu21013_init_chip(ts);
if (error) {
dev_err(&client->dev, "error in bu21013 config\n");
- goto err_cs_disable;
+ return error;
}
- /* register the device to input subsystem */
- in_dev->name = DRIVER_TP;
- in_dev->id.bustype = BUS_I2C;
- in_dev->dev.parent = &client->dev;
-
- __set_bit(EV_SYN, in_dev->evbit);
- __set_bit(EV_KEY, in_dev->evbit);
- __set_bit(EV_ABS, in_dev->evbit);
-
- input_set_abs_params(in_dev, ABS_MT_POSITION_X,
- 0, pdata->touch_x_max, 0, 0);
- input_set_abs_params(in_dev, ABS_MT_POSITION_Y,
- 0, pdata->touch_y_max, 0, 0);
- input_set_drvdata(in_dev, ts);
-
- error = request_threaded_irq(ts->irq, NULL, bu21013_gpio_irq,
- IRQF_TRIGGER_FALLING | IRQF_SHARED |
- IRQF_ONESHOT,
- DRIVER_TP, ts);
+ ts->irq = gpiod_to_irq(ts->int_gpiod);
+ error = devm_request_threaded_irq(&client->dev, ts->irq,
+ NULL, bu21013_gpio_irq,
+ IRQF_TRIGGER_FALLING |
+ IRQF_SHARED |
+ IRQF_ONESHOT,
+ DRIVER_TP, ts);
if (error) {
dev_err(&client->dev, "request irq %d failed\n",
ts->irq);
- goto err_cs_disable;
+ return error;
}
error = input_register_device(in_dev);
if (error) {
dev_err(&client->dev, "failed to register input device\n");
- goto err_free_irq;
+ return error;
}
device_init_wakeup(&client->dev, pdata->wakeup);
i2c_set_clientdata(client, ts);
return 0;
-
-err_free_irq:
- bu21013_free_irq(ts);
-err_cs_disable:
- gpiod_set_value(ts->cs_gpiod, 0);
- gpiod_put(ts->cs_gpiod);
-err_disable_regulator:
- regulator_disable(ts->regulator);
-err_put_regulator:
- regulator_put(ts->regulator);
-err_put_int_gpio:
- gpiod_put(ts->int_gpiod);
-err_free_mem:
- input_free_device(in_dev);
- kfree(ts);
-
- return error;
}
static int bu21013_remove(struct i2c_client *client)
{
struct bu21013_ts *ts = i2c_get_clientdata(client);
- bu21013_free_irq(ts);
-
- gpiod_set_value(ts->cs_gpiod, 0);
- gpiod_put(ts->cs_gpiod);
-
- input_unregister_device(ts->in_dev);
-
- regulator_disable(ts->regulator);
- regulator_put(ts->regulator);
-
- gpiod_put(ts->int_gpiod);
-
- kfree(ts);
+ /* Make sure IRQ will exit quickly even if there is contact */
+ ts->touch_stopped = true;
+ /* The resources will be freed by devm */
return 0;
}
This allows trimming error unwinding and device removal handling. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> --- drivers/input/touchscreen/bu21013_ts.c | 182 ++++++++++++------------- 1 file changed, 84 insertions(+), 98 deletions(-)