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HID: i2c-hid-of: Add reset GPIO support to i2c-hid-of

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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>
This commit is contained in:
Hans de Goede 2023-04-13 11:36:25 +02:00 committed by Benjamin Tissoires
parent 728ec8b6ed
commit 2be404486c
1 changed files with 21 additions and 0 deletions
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21
drivers/hid/i2c-hid/i2c-hid-of.c
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@ -21,6 +21,7 @@
#include <linux/delay.h> #include <linux/delay.h>
#include <linux/device.h> #include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/hid.h> #include <linux/hid.h>
#include <linux/i2c.h> #include <linux/i2c.h>
#include <linux/kernel.h> #include <linux/kernel.h>
@ -35,8 +36,10 @@ struct i2c_hid_of {
struct i2chid_ops ops; struct i2chid_ops ops;
struct i2c_client *client; struct i2c_client *client;
struct gpio_desc *reset_gpio;
struct regulator_bulk_data supplies[2]; struct regulator_bulk_data supplies[2];
int post_power_delay_ms; int post_power_delay_ms;
int post_reset_delay_ms;
}; };
static int i2c_hid_of_power_up(struct i2chid_ops *ops) 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) if (ihid_of->post_power_delay_ms)
msleep(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; 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); 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), regulator_bulk_disable(ARRAY_SIZE(ihid_of->supplies),
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)) if (!device_property_read_u32(dev, "post-power-on-delay-ms", &val))
ihid_of->post_power_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[0].supply = "vdd";
ihid_of->supplies[1].supply = "vddl"; ihid_of->supplies[1].supply = "vddl";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ihid_of->supplies), ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ihid_of->supplies),