1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for Elan touchscreens that use the i2c-hid protocol.
11 #include <linux/i2c.h>
18 #include "i2c-hid.h"
43 	if (ihid_elan->vcc33) {  in elan_i2c_hid_power_up()
44 		ret = regulator_enable(ihid_elan->vcc33);  in elan_i2c_hid_power_up()
49 	ret = regulator_enable(ihid_elan->vccio);  in elan_i2c_hid_power_up()
51 		regulator_disable(ihid_elan->vcc33);  in elan_i2c_hid_power_up()
55 	if (ihid_elan->chip_data->post_power_delay_ms)  in elan_i2c_hid_power_up()
56 		msleep(ihid_elan->chip_data->post_power_delay_ms);  in elan_i2c_hid_power_up()
58 	gpiod_set_value_cansleep(ihid_elan->reset_gpio, 0);  in elan_i2c_hid_power_up()
59 	if (ihid_elan->chip_data->post_gpio_reset_on_delay_ms)  in elan_i2c_hid_power_up()
60 		msleep(ihid_elan->chip_data->post_gpio_reset_on_delay_ms);  in elan_i2c_hid_power_up()
70 	gpiod_set_value_cansleep(ihid_elan->reset_gpio, 1);  in elan_i2c_hid_power_down()
71 	if (ihid_elan->chip_data->post_gpio_reset_off_delay_ms)  in elan_i2c_hid_power_down()
72 		msleep(ihid_elan->chip_data->post_gpio_reset_off_delay_ms);  in elan_i2c_hid_power_down()
74 	regulator_disable(ihid_elan->vccio);  in elan_i2c_hid_power_down()
75 	if (ihid_elan->vcc33)  in elan_i2c_hid_power_down()
76 		regulator_disable(ihid_elan->vcc33);  in elan_i2c_hid_power_down()
83 	ihid_elan = devm_kzalloc(&client->dev, sizeof(*ihid_elan), GFP_KERNEL);  in i2c_hid_of_elan_probe()
85 		return -ENOMEM;  in i2c_hid_of_elan_probe()
87 	ihid_elan->ops.power_up = elan_i2c_hid_power_up;  in i2c_hid_of_elan_probe()
88 	ihid_elan->ops.power_down = elan_i2c_hid_power_down;  in i2c_hid_of_elan_probe()
91 	ihid_elan->reset_gpio =  in i2c_hid_of_elan_probe()
92 		devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);  in i2c_hid_of_elan_probe()
93 	if (IS_ERR(ihid_elan->reset_gpio))  in i2c_hid_of_elan_probe()
94 		return PTR_ERR(ihid_elan->reset_gpio);  in i2c_hid_of_elan_probe()
96 	ihid_elan->vccio = devm_regulator_get(&client->dev, "vccio");  in i2c_hid_of_elan_probe()
97 	if (IS_ERR(ihid_elan->vccio))  in i2c_hid_of_elan_probe()
98 		return PTR_ERR(ihid_elan->vccio);  in i2c_hid_of_elan_probe()
100 	ihid_elan->chip_data = device_get_match_data(&client->dev);  in i2c_hid_of_elan_probe()
102 	if (ihid_elan->chip_data->main_supply_name) {  in i2c_hid_of_elan_probe()
103 		ihid_elan->vcc33 = devm_regulator_get(&client->dev,  in i2c_hid_of_elan_probe()
104 						      ihid_elan->chip_data->main_supply_name);  in i2c_hid_of_elan_probe()
105 		if (IS_ERR(ihid_elan->vcc33))  in i2c_hid_of_elan_probe()
106 			return PTR_ERR(ihid_elan->vcc33);  in i2c_hid_of_elan_probe()
109 	return i2c_hid_core_probe(client, &ihid_elan->ops,  in i2c_hid_of_elan_probe()
110 				  ihid_elan->chip_data->hid_descriptor_address, 0);  in i2c_hid_of_elan_probe()
162 MODULE_DESCRIPTION("Elan i2c-hid touchscreen driver");