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116 lines
3.1 KiB
116 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Driver for Goodix touchscreens that use the i2c-hid protocol. |
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* |
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* Copyright 2020 Google LLC |
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*/ |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/i2c.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/pm.h> |
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#include <linux/regulator/consumer.h> |
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#include "i2c-hid.h" |
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struct goodix_i2c_hid_timing_data { |
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unsigned int post_gpio_reset_delay_ms; |
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unsigned int post_power_delay_ms; |
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}; |
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struct i2c_hid_of_goodix { |
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struct i2chid_ops ops; |
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struct regulator *vdd; |
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struct gpio_desc *reset_gpio; |
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const struct goodix_i2c_hid_timing_data *timings; |
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}; |
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static int goodix_i2c_hid_power_up(struct i2chid_ops *ops) |
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{ |
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struct i2c_hid_of_goodix *ihid_goodix = |
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container_of(ops, struct i2c_hid_of_goodix, ops); |
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int ret; |
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ret = regulator_enable(ihid_goodix->vdd); |
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if (ret) |
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return ret; |
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if (ihid_goodix->timings->post_power_delay_ms) |
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msleep(ihid_goodix->timings->post_power_delay_ms); |
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gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 0); |
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if (ihid_goodix->timings->post_gpio_reset_delay_ms) |
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msleep(ihid_goodix->timings->post_gpio_reset_delay_ms); |
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return 0; |
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} |
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static void goodix_i2c_hid_power_down(struct i2chid_ops *ops) |
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{ |
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struct i2c_hid_of_goodix *ihid_goodix = |
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container_of(ops, struct i2c_hid_of_goodix, ops); |
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gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1); |
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regulator_disable(ihid_goodix->vdd); |
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} |
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static int i2c_hid_of_goodix_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct i2c_hid_of_goodix *ihid_goodix; |
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ihid_goodix = devm_kzalloc(&client->dev, sizeof(*ihid_goodix), |
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GFP_KERNEL); |
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if (!ihid_goodix) |
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return -ENOMEM; |
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ihid_goodix->ops.power_up = goodix_i2c_hid_power_up; |
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ihid_goodix->ops.power_down = goodix_i2c_hid_power_down; |
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/* Start out with reset asserted */ |
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ihid_goodix->reset_gpio = |
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devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH); |
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if (IS_ERR(ihid_goodix->reset_gpio)) |
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return PTR_ERR(ihid_goodix->reset_gpio); |
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ihid_goodix->vdd = devm_regulator_get(&client->dev, "vdd"); |
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if (IS_ERR(ihid_goodix->vdd)) |
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return PTR_ERR(ihid_goodix->vdd); |
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ihid_goodix->timings = device_get_match_data(&client->dev); |
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return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001); |
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} |
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static const struct goodix_i2c_hid_timing_data goodix_gt7375p_timing_data = { |
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.post_power_delay_ms = 10, |
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.post_gpio_reset_delay_ms = 180, |
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}; |
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static const struct of_device_id goodix_i2c_hid_of_match[] = { |
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{ .compatible = "goodix,gt7375p", .data = &goodix_gt7375p_timing_data }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, goodix_i2c_hid_of_match); |
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static struct i2c_driver goodix_i2c_hid_ts_driver = { |
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.driver = { |
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.name = "i2c_hid_of_goodix", |
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.pm = &i2c_hid_core_pm, |
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.probe_type = PROBE_PREFER_ASYNCHRONOUS, |
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.of_match_table = of_match_ptr(goodix_i2c_hid_of_match), |
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}, |
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.probe = i2c_hid_of_goodix_probe, |
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.remove = i2c_hid_core_remove, |
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.shutdown = i2c_hid_core_shutdown, |
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}; |
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module_i2c_driver(goodix_i2c_hid_ts_driver); |
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MODULE_AUTHOR("Douglas Anderson <[email protected]>"); |
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MODULE_DESCRIPTION("Goodix i2c-hid touchscreen driver"); |
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MODULE_LICENSE("GPL v2");
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