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Input: goodix - add support for controlling the IRQ pin through ACPI methods

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Some Apollo Lake (x86, UEFI + ACPI) devices only list the reset GPIO
in their _CRS table and the bit-banging of the IRQ line necessary to
wake-up the controller from suspend can be done by calling 2 Goodix
custom / specific ACPI methods.

This commit adds support for controlling the IRQ line in this matter,
allowing us to properly suspend the touchscreen controller on such
devices.

BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1786317
BugLink: https://github.com/nexus511/gpd-ubuntu-packages/issues/10
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199207
Reviewed-by: Bastien Nocera <hadess@hadess.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20200307121505.3707-6-hdegoede@redhat.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Hans de Goede 2020-03-24 11:24:31 -07:00 committed by Dmitry Torokhov
parent 67abd9eeb4
commit c5fca48532
1 changed files with 30 additions and 0 deletions
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30
drivers/input/touchscreen/goodix.c
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@ -35,6 +35,7 @@ enum goodix_irq_pin_access_method {
IRQ_PIN_ACCESS_NONE,
IRQ_PIN_ACCESS_GPIO,
IRQ_PIN_ACCESS_ACPI_GPIO,
IRQ_PIN_ACCESS_ACPI_METHOD,
};
struct goodix_chip_data {
@ -532,6 +533,9 @@ static int goodix_send_cfg(struct goodix_ts_data *ts,
static int goodix_irq_direction_output(struct goodix_ts_data *ts,
int value)
{
struct device *dev = &ts->client->dev;
acpi_status status;
switch (ts->irq_pin_access_method) {
case IRQ_PIN_ACCESS_NONE:
dev_err(&ts->client->dev,
@ -546,6 +550,10 @@ static int goodix_irq_direction_output(struct goodix_ts_data *ts,
* as active-low, use output_raw to avoid the value inversion.
*/
return gpiod_direction_output_raw(ts->gpiod_int, value);
case IRQ_PIN_ACCESS_ACPI_METHOD:
status = acpi_execute_simple_method(ACPI_HANDLE(dev),
"INTO", value);
return ACPI_SUCCESS(status) ? 0 : -EIO;
}
return -EINVAL; /* Never reached */
@ -553,6 +561,9 @@ static int goodix_irq_direction_output(struct goodix_ts_data *ts,
static int goodix_irq_direction_input(struct goodix_ts_data *ts)
{
struct device *dev = &ts->client->dev;
acpi_status status;
switch (ts->irq_pin_access_method) {
case IRQ_PIN_ACCESS_NONE:
dev_err(&ts->client->dev,
@ -562,6 +573,10 @@ static int goodix_irq_direction_input(struct goodix_ts_data *ts)
case IRQ_PIN_ACCESS_GPIO:
case IRQ_PIN_ACCESS_ACPI_GPIO:
return gpiod_direction_input(ts->gpiod_int);
case IRQ_PIN_ACCESS_ACPI_METHOD:
status = acpi_evaluate_object(ACPI_HANDLE(dev), "INTI",
NULL, NULL);
return ACPI_SUCCESS(status) ? 0 : -EIO;
}
return -EINVAL; /* Never reached */
@ -656,6 +671,11 @@ static const struct acpi_gpio_mapping acpi_goodix_int_last_gpios[] = {
{ },
};
static const struct acpi_gpio_mapping acpi_goodix_reset_only_gpios[] = {
{ GOODIX_GPIO_RST_NAME "-gpios", &first_gpio, 1 },
{ },
};
static int goodix_resource(struct acpi_resource *ares, void *data)
{
struct goodix_ts_data *ts = data;
@ -713,6 +733,12 @@ static int goodix_add_acpi_gpio_mappings(struct goodix_ts_data *ts)
} else if (ts->gpio_count == 2 && ts->gpio_int_idx == 1) {
ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
gpio_mapping = acpi_goodix_int_last_gpios;
} else if (ts->gpio_count == 1 && ts->gpio_int_idx == -1 &&
acpi_has_method(ACPI_HANDLE(dev), "INTI") &&
acpi_has_method(ACPI_HANDLE(dev), "INTO")) {
dev_info(dev, "Using ACPI INTI and INTO methods for IRQ pin access\n");
ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_METHOD;
gpio_mapping = acpi_goodix_reset_only_gpios;
} else if (is_byt() && ts->gpio_count == 2 && ts->gpio_int_idx == -1) {
dev_info(dev, "No ACPI GpioInt resource, assuming that the GPIO order is reset, int\n");
ts->irq_pin_access_method = IRQ_PIN_ACCESS_ACPI_GPIO;
@ -809,6 +835,10 @@ retry_get_irq_gpio:
if (!ts->gpiod_int || !ts->gpiod_rst)
ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE;
break;
case IRQ_PIN_ACCESS_ACPI_METHOD:
if (!ts->gpiod_rst)
ts->irq_pin_access_method = IRQ_PIN_ACCESS_NONE;
break;
default:
if (ts->gpiod_int && ts->gpiod_rst) {
ts->reset_controller_at_probe = true;