1 // SPDX-License-Identifier: GPL-2.0-only
10 #include <linux/backlight.h>
14 #include <linux/gpio/consumer.h>
72 	struct backlight_device *backlight;  member
79 	return i2c_smbus_write_byte_data(bd->client, reg, data);  in bd6107_write()
82 static int bd6107_backlight_update_status(struct backlight_device *backlight)  in bd6107_backlight_update_status()  argument
84 	struct bd6107 *bd = bl_get_data(backlight);  in bd6107_backlight_update_status()
85 	int brightness = backlight_get_brightness(backlight);  in bd6107_backlight_update_status()
94 		gpiod_set_value(bd->reset, 1);  in bd6107_backlight_update_status()
96 		gpiod_set_value(bd->reset, 0);  in bd6107_backlight_update_status()
102 static int bd6107_backlight_check_fb(struct backlight_device *backlight,  in bd6107_backlight_check_fb()  argument
105 	struct bd6107 *bd = bl_get_data(backlight);  in bd6107_backlight_check_fb()
107 	return !bd->pdata->dev || bd->pdata->dev == info->device;  in bd6107_backlight_check_fb()
118 	struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev);  in bd6107_probe()
119 	struct backlight_device *backlight;  in bd6107_probe()  local
125 		dev_err(&client->dev, "No platform data\n");  in bd6107_probe()
126 		return -EINVAL;  in bd6107_probe()
129 	if (!i2c_check_functionality(client->adapter,  in bd6107_probe()
131 		dev_warn(&client->dev,  in bd6107_probe()
133 		return -EIO;  in bd6107_probe()
136 	bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);  in bd6107_probe()
138 		return -ENOMEM;  in bd6107_probe()
140 	bd->client = client;  in bd6107_probe()
141 	bd->pdata = pdata;  in bd6107_probe()
144 	 * Request the reset GPIO line with GPIOD_OUT_HIGH meaning asserted,  in bd6107_probe()
149 	bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);  in bd6107_probe()
150 	if (IS_ERR(bd->reset)) {  in bd6107_probe()
151 		dev_err(&client->dev, "unable to request reset GPIO\n");  in bd6107_probe()
152 		ret = PTR_ERR(bd->reset);  in bd6107_probe()
159 	props.brightness = clamp_t(unsigned int, pdata->def_value, 0,  in bd6107_probe()
162 	backlight = devm_backlight_device_register(&client->dev,  in bd6107_probe()
163 					      dev_name(&client->dev),  in bd6107_probe()
164 					      &bd->client->dev, bd,  in bd6107_probe()
166 	if (IS_ERR(backlight)) {  in bd6107_probe()
167 		dev_err(&client->dev, "failed to register backlight\n");  in bd6107_probe()
168 		return PTR_ERR(backlight);  in bd6107_probe()
171 	backlight_update_status(backlight);  in bd6107_probe()
172 	i2c_set_clientdata(client, backlight);  in bd6107_probe()
179 	struct backlight_device *backlight = i2c_get_clientdata(client);  in bd6107_remove()  local
181 	backlight->props.brightness = 0;  in bd6107_remove()
182 	backlight_update_status(backlight);  in bd6107_remove()
202 MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver");