1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for Goodix touchscreens that use the i2c-hid protocol.
11 #include <linux/i2c.h>
18 #include "i2c-hid.h"
42 	 * We assert reset GPIO here (instead of during power-down) to ensure  in goodix_i2c_hid_power_up()
46 	if (ihid_goodix->no_reset_during_suspend)  in goodix_i2c_hid_power_up()
47 		gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);  in goodix_i2c_hid_power_up()
49 	ret = regulator_enable(ihid_goodix->vdd);  in goodix_i2c_hid_power_up()
53 	ret = regulator_enable(ihid_goodix->vddio);  in goodix_i2c_hid_power_up()
57 	if (ihid_goodix->timings->post_power_delay_ms)  in goodix_i2c_hid_power_up()
58 		msleep(ihid_goodix->timings->post_power_delay_ms);  in goodix_i2c_hid_power_up()
60 	gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 0);  in goodix_i2c_hid_power_up()
61 	if (ihid_goodix->timings->post_gpio_reset_delay_ms)  in goodix_i2c_hid_power_up()
62 		msleep(ihid_goodix->timings->post_gpio_reset_delay_ms);  in goodix_i2c_hid_power_up()
72 	if (!ihid_goodix->no_reset_during_suspend)  in goodix_i2c_hid_power_down()
73 		gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1);  in goodix_i2c_hid_power_down()
75 	regulator_disable(ihid_goodix->vddio);  in goodix_i2c_hid_power_down()
76 	regulator_disable(ihid_goodix->vdd);  in goodix_i2c_hid_power_down()
83 	ihid_goodix = devm_kzalloc(&client->dev, sizeof(*ihid_goodix),  in i2c_hid_of_goodix_probe()
86 		return -ENOMEM;  in i2c_hid_of_goodix_probe()
88 	ihid_goodix->ops.power_up = goodix_i2c_hid_power_up;  in i2c_hid_of_goodix_probe()
89 	ihid_goodix->ops.power_down = goodix_i2c_hid_power_down;  in i2c_hid_of_goodix_probe()
92 	ihid_goodix->reset_gpio =  in i2c_hid_of_goodix_probe()
93 		devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);  in i2c_hid_of_goodix_probe()
94 	if (IS_ERR(ihid_goodix->reset_gpio))  in i2c_hid_of_goodix_probe()
95 		return PTR_ERR(ihid_goodix->reset_gpio);  in i2c_hid_of_goodix_probe()
97 	ihid_goodix->vdd = devm_regulator_get(&client->dev, "vdd");  in i2c_hid_of_goodix_probe()
98 	if (IS_ERR(ihid_goodix->vdd))  in i2c_hid_of_goodix_probe()
99 		return PTR_ERR(ihid_goodix->vdd);  in i2c_hid_of_goodix_probe()
101 	ihid_goodix->vddio = devm_regulator_get(&client->dev, "mainboard-vddio");  in i2c_hid_of_goodix_probe()
102 	if (IS_ERR(ihid_goodix->vddio))  in i2c_hid_of_goodix_probe()
103 		return PTR_ERR(ihid_goodix->vddio);  in i2c_hid_of_goodix_probe()
105 	ihid_goodix->no_reset_during_suspend =  in i2c_hid_of_goodix_probe()
106 		of_property_read_bool(client->dev.of_node, "goodix,no-reset-during-suspend");  in i2c_hid_of_goodix_probe()
108 	ihid_goodix->timings = device_get_match_data(&client->dev);  in i2c_hid_of_goodix_probe()
110 	return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001, 0);  in i2c_hid_of_goodix_probe()
138 MODULE_DESCRIPTION("Goodix i2c-hid touchscreen driver");