1 // SPDX-License-Identifier: GPL-2.0-only
26 static int wm831x_backlight_set(struct backlight_device *bl, int brightness)  in wm831x_backlight_set()  argument
28 	struct wm831x_backlight_data *data = bl_get_data(bl);  in wm831x_backlight_set()
29 	struct wm831x *wm831x = data->wm831x;  in wm831x_backlight_set()
30 	int power_up = !data->current_brightness && brightness;  in wm831x_backlight_set()
31 	int power_down = data->current_brightness && !brightness;  in wm831x_backlight_set()
36 		ret = wm831x_set_bits(wm831x, data->isink_reg,  in wm831x_backlight_set()
41 		/* Enable the DC-DC */  in wm831x_backlight_set()
56 		ret = wm831x_set_bits(wm831x, data->isink_reg,  in wm831x_backlight_set()
63 	ret = wm831x_set_bits(wm831x, data->isink_reg,  in wm831x_backlight_set()
70 		ret = wm831x_set_bits(wm831x, data->isink_reg,  in wm831x_backlight_set()
76 	data->current_brightness = brightness;  in wm831x_backlight_set()
86 		wm831x_set_bits(wm831x, data->isink_reg, WM831X_CS1_ENA, 0);  in wm831x_backlight_set()
92 static int wm831x_backlight_update_status(struct backlight_device *bl)  in wm831x_backlight_update_status()  argument
94 	return wm831x_backlight_set(bl, backlight_get_brightness(bl));  in wm831x_backlight_update_status()
97 static int wm831x_backlight_get_brightness(struct backlight_device *bl)  in wm831x_backlight_get_brightness()  argument
99 	struct wm831x_backlight_data *data = bl_get_data(bl);  in wm831x_backlight_get_brightness()
101 	return data->current_brightness;  in wm831x_backlight_get_brightness()
112 	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);  in wm831x_backlight_probe()
113 	struct wm831x_pdata *wm831x_pdata = dev_get_platdata(pdev->dev.parent);  in wm831x_backlight_probe()
116 	struct backlight_device *bl;  in wm831x_backlight_probe()  local
122 		pdata = wm831x_pdata->backlight;  in wm831x_backlight_probe()
127 		dev_err(&pdev->dev, "No platform data supplied\n");  in wm831x_backlight_probe()
128 		return -EINVAL;  in wm831x_backlight_probe()
133 		if (wm831x_isinkv_values[i] > pdata->max_uA)  in wm831x_backlight_probe()
138 		dev_err(&pdev->dev, "Invalid max_uA: %duA\n", pdata->max_uA);  in wm831x_backlight_probe()
139 		return -EINVAL;  in wm831x_backlight_probe()
141 	max_isel = i - 1;  in wm831x_backlight_probe()
143 	if (pdata->max_uA != wm831x_isinkv_values[max_isel])  in wm831x_backlight_probe()
144 		dev_warn(&pdev->dev,  in wm831x_backlight_probe()
146 			 wm831x_isinkv_values[max_isel], pdata->max_uA);  in wm831x_backlight_probe()
148 	switch (pdata->isink) {  in wm831x_backlight_probe()
158 		dev_err(&pdev->dev, "Invalid ISINK %d\n", pdata->isink);  in wm831x_backlight_probe()
159 		return -EINVAL;  in wm831x_backlight_probe()
174 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);  in wm831x_backlight_probe()
176 		return -ENOMEM;  in wm831x_backlight_probe()
178 	data->wm831x = wm831x;  in wm831x_backlight_probe()
179 	data->current_brightness = 0;  in wm831x_backlight_probe()
180 	data->isink_reg = isink_reg;  in wm831x_backlight_probe()
185 	bl = devm_backlight_device_register(&pdev->dev, "wm831x", &pdev->dev,  in wm831x_backlight_probe()
187 	if (IS_ERR(bl)) {  in wm831x_backlight_probe()
188 		dev_err(&pdev->dev, "failed to register backlight\n");  in wm831x_backlight_probe()
189 		return PTR_ERR(bl);  in wm831x_backlight_probe()
192 	bl->props.brightness = max_isel;  in wm831x_backlight_probe()
194 	platform_set_drvdata(pdev, bl);  in wm831x_backlight_probe()
199 	backlight_update_status(bl);  in wm831x_backlight_probe()
206 		.name	= "wm831x-backlight",
216 MODULE_ALIAS("platform:wm831x-backlight");