3  * Driver for the ChromeOS human presence sensor (HPS), attached via I2C.
5  * The driver exposes HPS as a character device, although currently no read or
8  * descriptor to the HPS device.
29 static void hps_set_power(struct hps_drvdata *hps, bool state)  in hps_set_power()  argument
31 	gpiod_set_value_cansleep(hps->enable_gpio, state);  in hps_set_power()
36 	struct hps_drvdata *hps = container_of(file->private_data,  in hps_open()  local
38 	struct device *dev = &hps->client->dev;  in hps_open()
45 	struct hps_drvdata *hps = container_of(file->private_data,  in hps_release()  local
47 	struct device *dev = &hps->client->dev;  in hps_release()
60 	struct hps_drvdata *hps;  in hps_i2c_probe()  local
63 	hps = devm_kzalloc(&client->dev, sizeof(*hps), GFP_KERNEL);  in hps_i2c_probe()
64 	if (!hps)  in hps_i2c_probe()
67 	hps->misc_device.parent = &client->dev;  in hps_i2c_probe()
68 	hps->misc_device.minor = MISC_DYNAMIC_MINOR;  in hps_i2c_probe()
69 	hps->misc_device.name = "cros-hps";  in hps_i2c_probe()
70 	hps->misc_device.fops = &hps_fops;  in hps_i2c_probe()
72 	i2c_set_clientdata(client, hps);  in hps_i2c_probe()
73 	hps->client = client;  in hps_i2c_probe()
76 	 * HPS is powered on from firmware before entering the kernel, so we  in hps_i2c_probe()
80 	hps->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_HIGH);  in hps_i2c_probe()
81 	if (IS_ERR(hps->enable_gpio)) {  in hps_i2c_probe()
82 		ret = PTR_ERR(hps->enable_gpio);  in hps_i2c_probe()
87 	ret = misc_register(&hps->misc_device);  in hps_i2c_probe()
93 	hps_set_power(hps, false);  in hps_i2c_probe()
100 	struct hps_drvdata *hps = i2c_get_clientdata(client);  in hps_i2c_remove()  local
103 	misc_deregister(&hps->misc_device);  in hps_i2c_remove()
106 	 * Re-enable HPS, in order to return it to its default state  in hps_i2c_remove()
109 	hps_set_power(hps, true);  in hps_i2c_remove()
115 	struct hps_drvdata *hps = i2c_get_clientdata(client);  in hps_suspend()  local
117 	hps_set_power(hps, false);  in hps_suspend()
124 	struct hps_drvdata *hps = i2c_get_clientdata(client);  in hps_resume()  local
126 	hps_set_power(hps, true);  in hps_resume()
132 	{ "cros-hps", 0 },
150 		.name = "cros-hps",
159 MODULE_DESCRIPTION("Driver for ChromeOS HPS");