Merge tag 'for-linus-2023083101' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid

Pull HID updates from Benjamin Tissoires:

 - devm fixes for problems that caused use-after-free reports (Rahul
   Rameshbabu)

 - Some extensive HID docs (Marco Morandini)

 - Constification of struct class (Ivan Orlov and Greg Kroah-Hartman)

 - Google Stadia Force Feedback support (Fabio Baltieri)

 - Various fixes and new device ID support

* tag 'for-linus-2023083101' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid: (42 commits)
  HID: logitech-hidpp: rework one more time the retries attempts
  HID: nvidia-shield: Reference hid_device devm allocation of input_dev name
  HID: multitouch: Correct devm device reference for hidinput input_dev name
  HID: uclogic: Correct devm device reference for hidinput input_dev name
  HID: logitech-dj: Fix error handling in logi_dj_recv_switch_to_dj_mode()
  HID: i2c-hid: elan: Add ili9882t timing
  dt-bindings: input: i2c-hid: Introduce Ilitek ili9882t
  HID: apple: Add "Hailuck" to the list of non-apple keyboards
  HID: steelseries: arctis_1_battery_request[] should be static
  MAINTAINERS: update my email address
  HID: logitech-hidpp: Add support for Logitech MX Anywhere 3 mouse
  HID: wacom: struct name cleanup
  HID: wacom: remove unnecessary 'connected' variable from EKR
  HID: wacom: remove the battery when the EKR is off
  HID: nvidia-shield: Update Thunderstrike LED instance name to use id
  HID: nvidia-shield: Add battery support for Thunderstrike
  HID: nvidia-shield: Remove led_classdev_unregister in thunderstrike_create
  HID: hid-google-stadiaff: add support for Stadia force feedback
  HID: logitech-dj: Add support for a new lightspeed receiver iteration
  HID: logitech-hidpp: Add support for the Pro X Superlight
  ...

1 files changed, 38 insertions, 12 deletions

diff --git a/drivers/hid/i2c-hid/i2c-hid-of-elan.c b/drivers/hid/i2c-hid/i2c-hid-of-elan.c
index 029045d9661c..31abab57ad44 100644
--- a/drivers/hid/i2c-hid/i2c-hid-of-elan.c
+++ b/drivers/hid/i2c-hid/i2c-hid-of-elan.c
@@ -18,9 +18,11 @@
 #include "i2c-hid.h"
 
 struct elan_i2c_hid_chip_data {
-	unsigned int post_gpio_reset_delay_ms;
+	unsigned int post_gpio_reset_on_delay_ms;
+	unsigned int post_gpio_reset_off_delay_ms;
 	unsigned int post_power_delay_ms;
 	u16 hid_descriptor_address;
+	const char *main_supply_name;
 };
 
 struct i2c_hid_of_elan {
@@ -38,9 +40,11 @@ static int elan_i2c_hid_power_up(struct i2chid_ops *ops)
 		container_of(ops, struct i2c_hid_of_elan, ops);
 	int ret;
 
-	ret = regulator_enable(ihid_elan->vcc33);
-	if (ret)
-		return ret;
+	if (ihid_elan->vcc33) {
+		ret = regulator_enable(ihid_elan->vcc33);
+		if (ret)
+			return ret;
+	}
 
 	ret = regulator_enable(ihid_elan->vccio);
 	if (ret) {
@@ -52,8 +56,8 @@ static int elan_i2c_hid_power_up(struct i2chid_ops *ops)
 		msleep(ihid_elan->chip_data->post_power_delay_ms);
 
 	gpiod_set_value_cansleep(ihid_elan->reset_gpio, 0);
-	if (ihid_elan->chip_data->post_gpio_reset_delay_ms)
-		msleep(ihid_elan->chip_data->post_gpio_reset_delay_ms);
+	if (ihid_elan->chip_data->post_gpio_reset_on_delay_ms)
+		msleep(ihid_elan->chip_data->post_gpio_reset_on_delay_ms);
 
 	return 0;
 }
@@ -64,8 +68,12 @@ static void elan_i2c_hid_power_down(struct i2chid_ops *ops)
 		container_of(ops, struct i2c_hid_of_elan, ops);
 
 	gpiod_set_value_cansleep(ihid_elan->reset_gpio, 1);
+	if (ihid_elan->chip_data->post_gpio_reset_off_delay_ms)
+		msleep(ihid_elan->chip_data->post_gpio_reset_off_delay_ms);
+
 	regulator_disable(ihid_elan->vccio);
-	regulator_disable(ihid_elan->vcc33);
+	if (ihid_elan->vcc33)
+		regulator_disable(ihid_elan->vcc33);
 }
 
 static int i2c_hid_of_elan_probe(struct i2c_client *client)
@@ -89,24 +97,42 @@ static int i2c_hid_of_elan_probe(struct i2c_client *client)
 	if (IS_ERR(ihid_elan->vccio))
 		return PTR_ERR(ihid_elan->vccio);
 
-	ihid_elan->vcc33 = devm_regulator_get(&client->dev, "vcc33");
-	if (IS_ERR(ihid_elan->vcc33))
-		return PTR_ERR(ihid_elan->vcc33);
-
 	ihid_elan->chip_data = device_get_match_data(&client->dev);
 
+	if (ihid_elan->chip_data->main_supply_name) {
+		ihid_elan->vcc33 = devm_regulator_get(&client->dev,
+						      ihid_elan->chip_data->main_supply_name);
+		if (IS_ERR(ihid_elan->vcc33))
+			return PTR_ERR(ihid_elan->vcc33);
+	}
+
 	return i2c_hid_core_probe(client, &ihid_elan->ops,
 				  ihid_elan->chip_data->hid_descriptor_address, 0);
 }
 
 static const struct elan_i2c_hid_chip_data elan_ekth6915_chip_data = {
 	.post_power_delay_ms = 1,
-	.post_gpio_reset_delay_ms = 300,
+	.post_gpio_reset_on_delay_ms = 300,
+	.hid_descriptor_address = 0x0001,
+	.main_supply_name = "vcc33",
+};
+
+static const struct elan_i2c_hid_chip_data ilitek_ili9882t_chip_data = {
+	.post_power_delay_ms = 1,
+	.post_gpio_reset_on_delay_ms = 200,
+	.post_gpio_reset_off_delay_ms = 65,
 	.hid_descriptor_address = 0x0001,
+	/*
+	 * this touchscreen is tightly integrated with the panel and assumes
+	 * that the relevant power rails (other than the IO rail) have already
+	 * been turned on by the panel driver because we're a panel follower.
+	 */
+	.main_supply_name = NULL,
 };
 
 static const struct of_device_id elan_i2c_hid_of_match[] = {
 	{ .compatible = "elan,ekth6915", .data = &elan_ekth6915_chip_data },
+	{ .compatible = "ilitek,ili9882t", .data = &ilitek_ili9882t_chip_data },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, elan_i2c_hid_of_match);