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| author | Hans de Goede <hdegoede@redhat.com> | 2023-04-13 12:36:25 +0300 |
|---|---|---|
| committer | Benjamin Tissoires <benjamin.tissoires@redhat.com> | 2023-04-13 17:27:42 +0300 |
| commit | 2be404486c05980371b293ea5ff4b3fde70cedae (patch) | |
| tree | 8ca5b37dda2007c9ff801719cee9e7a46a065604 /drivers/hid/i2c-hid/i2c-hid-of.c | |
| parent | 728ec8b6eda8f61dfeb2a4154e90c134d307e1de (diff) | |
| download | linux-2be404486c05980371b293ea5ff4b3fde70cedae.tar.xz | |
HID: i2c-hid-of: Add reset GPIO support to i2c-hid-of
Add reset GPIO support to the generic i2c-hid-of driver
This is necessary to make the Wacom digitizer on the Lenovo Yoga Book 1
(yb1-x90f/l) work and this will also allow consolidating the 2 specialized
i2c-hid-of-elan.c and i2c-hid-of-goodix.c drivers into the generic
i2c-hid-of driver.
For now the new "post-reset-deassert-delay-ms" property is only used on
x86/ACPI (non devicetree) devs. IOW it is not used in actual devicetree
files and the same goes for the reset GPIO. The devicetree-bindings
maintainers have requested properties like these to not be added to
the devicetree-bindings, so the new property + GPIO are deliberately
not added to the existing devicetree-bindings.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Link: https://lore.kernel.org/r/20230413093625.71146-4-hdegoede@redhat.com
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Diffstat (limited to 'drivers/hid/i2c-hid/i2c-hid-of.c')
| -rw-r--r-- | drivers/hid/i2c-hid/i2c-hid-of.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/hid/i2c-hid/i2c-hid-of.c b/drivers/hid/i2c-hid/i2c-hid-of.c index 385f7460e03c..855f53092f4e 100644 --- a/drivers/hid/i2c-hid/i2c-hid-of.c +++ b/drivers/hid/i2c-hid/i2c-hid-of.c @@ -21,6 +21,7 @@ #include <linux/delay.h> #include <linux/device.h> +#include <linux/gpio/consumer.h> #include <linux/hid.h> #include <linux/i2c.h> #include <linux/kernel.h> @@ -35,8 +36,10 @@ struct i2c_hid_of { struct i2chid_ops ops; struct i2c_client *client; + struct gpio_desc *reset_gpio; struct regulator_bulk_data supplies[2]; int post_power_delay_ms; + int post_reset_delay_ms; }; static int i2c_hid_of_power_up(struct i2chid_ops *ops) @@ -55,6 +58,10 @@ static int i2c_hid_of_power_up(struct i2chid_ops *ops) if (ihid_of->post_power_delay_ms) msleep(ihid_of->post_power_delay_ms); + gpiod_set_value_cansleep(ihid_of->reset_gpio, 0); + if (ihid_of->post_reset_delay_ms) + msleep(ihid_of->post_reset_delay_ms); + return 0; } @@ -62,6 +69,7 @@ static void i2c_hid_of_power_down(struct i2chid_ops *ops) { struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops); + gpiod_set_value_cansleep(ihid_of->reset_gpio, 1); regulator_bulk_disable(ARRAY_SIZE(ihid_of->supplies), ihid_of->supplies); } @@ -96,6 +104,19 @@ static int i2c_hid_of_probe(struct i2c_client *client) if (!device_property_read_u32(dev, "post-power-on-delay-ms", &val)) ihid_of->post_power_delay_ms = val; + /* + * Note this is a kernel internal device-property set by x86 platform code, + * this MUST not be used in devicetree files without first adding it to + * the DT bindings. + */ + if (!device_property_read_u32(dev, "post-reset-deassert-delay-ms", &val)) + ihid_of->post_reset_delay_ms = val; + + /* Start out with reset asserted */ + ihid_of->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(ihid_of->reset_gpio)) + return PTR_ERR(ihid_of->reset_gpio); + ihid_of->supplies[0].supply = "vdd"; ihid_of->supplies[1].supply = "vddl"; ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ihid_of->supplies), |