1 // SPDX-License-Identifier: GPL-2.0-only
10 #include <linux/backlight.h>
13 #include <linux/gpio/consumer.h>
71 	struct backlight_device *backlight;  member
78 	return i2c_smbus_write_byte_data(bd->client, reg, data);  in bd6107_write()
81 static int bd6107_backlight_update_status(struct backlight_device *backlight)  in bd6107_backlight_update_status()  argument
83 	struct bd6107 *bd = bl_get_data(backlight);  in bd6107_backlight_update_status()
84 	int brightness = backlight_get_brightness(backlight);  in bd6107_backlight_update_status()
93 		gpiod_set_value(bd->reset, 1);  in bd6107_backlight_update_status()
95 		gpiod_set_value(bd->reset, 0);  in bd6107_backlight_update_status()
101 static bool bd6107_backlight_controls_device(struct backlight_device *backlight,  in bd6107_backlight_controls_device()  argument
104 	struct bd6107 *bd = bl_get_data(backlight);  in bd6107_backlight_controls_device()
106 	return !bd->pdata->dev || bd->pdata->dev == display_dev;  in bd6107_backlight_controls_device()
117 	struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev);  in bd6107_probe()
118 	struct backlight_device *backlight;  in bd6107_probe()  local
123 		dev_err(&client->dev, "No platform data\n");  in bd6107_probe()
124 		return -EINVAL;  in bd6107_probe()
127 	if (!i2c_check_functionality(client->adapter,  in bd6107_probe()
129 		dev_warn(&client->dev,  in bd6107_probe()
131 		return -EIO;  in bd6107_probe()
134 	bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);  in bd6107_probe()
136 		return -ENOMEM;  in bd6107_probe()
138 	bd->client = client;  in bd6107_probe()
139 	bd->pdata = pdata;  in bd6107_probe()
142 	 * Request the reset GPIO line with GPIOD_OUT_HIGH meaning asserted,  in bd6107_probe()
147 	bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);  in bd6107_probe()
148 	if (IS_ERR(bd->reset))  in bd6107_probe()
149 		return dev_err_probe(&client->dev, PTR_ERR(bd->reset),  in bd6107_probe()
150 				     "unable to request reset GPIO\n");  in bd6107_probe()
155 	props.brightness = clamp_t(unsigned int, pdata->def_value, 0,  in bd6107_probe()
158 	backlight = devm_backlight_device_register(&client->dev,  in bd6107_probe()
159 					      dev_name(&client->dev),  in bd6107_probe()
160 					      &bd->client->dev, bd,  in bd6107_probe()
162 	if (IS_ERR(backlight)) {  in bd6107_probe()
163 		dev_err(&client->dev, "failed to register backlight\n");  in bd6107_probe()
164 		return PTR_ERR(backlight);  in bd6107_probe()
167 	backlight_update_status(backlight);  in bd6107_probe()
168 	i2c_set_clientdata(client, backlight);  in bd6107_probe()
175 	struct backlight_device *backlight = i2c_get_clientdata(client);  in bd6107_remove()  local
177 	backlight->props.brightness = 0;  in bd6107_remove()
178 	backlight_update_status(backlight);  in bd6107_remove()
198 MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver");