1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for Elan touchscreens that use the i2c-hid protocol.
18 #include "i2c-hid.h"
31 	struct regulator *vcc33;  member
44 	gpiod_set_value_cansleep(ihid_elan->reset_gpio, 1);  in elan_i2c_hid_power_up()
46 	if (ihid_elan->vcc33) {  in elan_i2c_hid_power_up()
47 		ret = regulator_enable(ihid_elan->vcc33);  in elan_i2c_hid_power_up()
52 	ret = regulator_enable(ihid_elan->vccio);  in elan_i2c_hid_power_up()
56 	if (ihid_elan->chip_data->post_power_delay_ms)  in elan_i2c_hid_power_up()
57 		msleep(ihid_elan->chip_data->post_power_delay_ms);  in elan_i2c_hid_power_up()
59 	gpiod_set_value_cansleep(ihid_elan->reset_gpio, 0);  in elan_i2c_hid_power_up()
60 	if (ihid_elan->chip_data->post_gpio_reset_on_delay_ms)  in elan_i2c_hid_power_up()
61 		msleep(ihid_elan->chip_data->post_gpio_reset_on_delay_ms);  in elan_i2c_hid_power_up()
66 	if (ihid_elan->vcc33)  in elan_i2c_hid_power_up()
67 		regulator_disable(ihid_elan->vcc33);  in elan_i2c_hid_power_up()
69 	if (ihid_elan->no_reset_on_power_off)  in elan_i2c_hid_power_up()
70 		gpiod_set_value_cansleep(ihid_elan->reset_gpio, 0);  in elan_i2c_hid_power_up()
82 	 * deasserted regardless of the state of the (shared) power supply to  in elan_i2c_hid_power_down()
83 	 * avoid wasting power when the supply is left on.  in elan_i2c_hid_power_down()
85 	if (!ihid_elan->no_reset_on_power_off)  in elan_i2c_hid_power_down()
86 		gpiod_set_value_cansleep(ihid_elan->reset_gpio, 1);  in elan_i2c_hid_power_down()
88 	if (ihid_elan->chip_data->post_gpio_reset_off_delay_ms)  in elan_i2c_hid_power_down()
89 		msleep(ihid_elan->chip_data->post_gpio_reset_off_delay_ms);  in elan_i2c_hid_power_down()
91 	regulator_disable(ihid_elan->vccio);  in elan_i2c_hid_power_down()
92 	if (ihid_elan->vcc33)  in elan_i2c_hid_power_down()
93 		regulator_disable(ihid_elan->vcc33);  in elan_i2c_hid_power_down()
101 	ihid_elan = devm_kzalloc(&client->dev, sizeof(*ihid_elan), GFP_KERNEL);  in i2c_hid_of_elan_probe()
103 		return -ENOMEM;  in i2c_hid_of_elan_probe()
105 	ihid_elan->ops.power_up = elan_i2c_hid_power_up;  in i2c_hid_of_elan_probe()
106 	ihid_elan->ops.power_down = elan_i2c_hid_power_down;  in i2c_hid_of_elan_probe()
109 	ihid_elan->reset_gpio =  in i2c_hid_of_elan_probe()
110 		devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);  in i2c_hid_of_elan_probe()
111 	if (IS_ERR(ihid_elan->reset_gpio))  in i2c_hid_of_elan_probe()
112 		return PTR_ERR(ihid_elan->reset_gpio);  in i2c_hid_of_elan_probe()
114 	ihid_elan->no_reset_on_power_off = of_property_read_bool(client->dev.of_node,  in i2c_hid_of_elan_probe()
115 						"no-reset-on-power-off");  in i2c_hid_of_elan_probe()
117 	ihid_elan->vccio = devm_regulator_get(&client->dev, "vccio");  in i2c_hid_of_elan_probe()
118 	if (IS_ERR(ihid_elan->vccio)) {  in i2c_hid_of_elan_probe()
119 		ret = PTR_ERR(ihid_elan->vccio);  in i2c_hid_of_elan_probe()
123 	ihid_elan->chip_data = device_get_match_data(&client->dev);  in i2c_hid_of_elan_probe()
125 	if (ihid_elan->chip_data->main_supply_name) {  in i2c_hid_of_elan_probe()
126 		ihid_elan->vcc33 = devm_regulator_get(&client->dev,  in i2c_hid_of_elan_probe()
127 						      ihid_elan->chip_data->main_supply_name);  in i2c_hid_of_elan_probe()
128 		if (IS_ERR(ihid_elan->vcc33)) {  in i2c_hid_of_elan_probe()
129 			ret = PTR_ERR(ihid_elan->vcc33);  in i2c_hid_of_elan_probe()
134 	ret = i2c_hid_core_probe(client, &ihid_elan->ops,  in i2c_hid_of_elan_probe()
135 				 ihid_elan->chip_data->hid_descriptor_address, 0);  in i2c_hid_of_elan_probe()
142 	if (ihid_elan->no_reset_on_power_off)  in i2c_hid_of_elan_probe()
143 		gpiod_set_value_cansleep(ihid_elan->reset_gpio, 0);  in i2c_hid_of_elan_probe()
152 	.main_supply_name = "vcc33",
159 	.main_supply_name = "vcc33",
179 	.main_supply_name = "vcc33",
205 MODULE_DESCRIPTION("Elan i2c-hid touchscreen driver");