1 // SPDX-License-Identifier: GPL-2.0-only
22  * @name		: Backlight driver name (NULL will use default)
23  * @initial_brightness	: initial value of backlight brightness
48 #define ARCXCNN_CMD_OVP_MASK	0x0C	/*   --- Over Voltage Threshold */
63 #define ARCXCNN_LEDEN_ISETEXT	0x80	/*   Full-scale current set extern */
99 	ret = i2c_smbus_read_byte_data(lp->client, reg);  in arcxcnn_update_field()
101 		dev_err(lp->dev, "failed to read 0x%.2x\n", reg);  in arcxcnn_update_field()
109 	return i2c_smbus_write_byte_data(lp->client, reg, tmp);  in arcxcnn_update_field()
112 static int arcxcnn_set_brightness(struct arcxcnn *lp, u32 brightness)  in arcxcnn_set_brightness()  argument
117 	/* lower nibble of brightness goes in upper nibble of LSB register */  in arcxcnn_set_brightness()
118 	val = (brightness & 0xF) << ARCXCNN_WLED_ISET_LSB_SHIFT;  in arcxcnn_set_brightness()
119 	ret = i2c_smbus_write_byte_data(lp->client,  in arcxcnn_set_brightness()
124 	/* remaining 8 bits of brightness go in MSB register */  in arcxcnn_set_brightness()
125 	val = (brightness >> 4);  in arcxcnn_set_brightness()
126 	return i2c_smbus_write_byte_data(lp->client,  in arcxcnn_set_brightness()
133 	u32 brightness = bl->props.brightness;  in arcxcnn_bl_update_status()  local
136 	if (bl->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))  in arcxcnn_bl_update_status()
137 		brightness = 0;  in arcxcnn_bl_update_status()
139 	ret = arcxcnn_set_brightness(lp, brightness);  in arcxcnn_bl_update_status()
143 	/* set power-on/off/save modes */  in arcxcnn_bl_update_status()
145 		(bl->props.power == 0) ? 0 : ARCXCNN_CMD_STDBY);  in arcxcnn_bl_update_status()
156 	const char *name = lp->pdata->name ? : "arctic_bl";  in arcxcnn_backlight_register()
158 	props = devm_kzalloc(lp->dev, sizeof(*props), GFP_KERNEL);  in arcxcnn_backlight_register()
160 		return -ENOMEM;  in arcxcnn_backlight_register()
162 	props->type = BACKLIGHT_PLATFORM;  in arcxcnn_backlight_register()
163 	props->max_brightness = MAX_BRIGHTNESS;  in arcxcnn_backlight_register()
165 	if (lp->pdata->initial_brightness > props->max_brightness)  in arcxcnn_backlight_register()
166 		lp->pdata->initial_brightness = props->max_brightness;  in arcxcnn_backlight_register()
168 	props->brightness = lp->pdata->initial_brightness;  in arcxcnn_backlight_register()
170 	lp->bl = devm_backlight_device_register(lp->dev, name, lp->dev, lp,  in arcxcnn_backlight_register()
172 	return PTR_ERR_OR_ZERO(lp->bl);  in arcxcnn_backlight_register()
177 	struct device *dev = lp->dev;  in arcxcnn_parse_dt()
178 	struct device_node *node = dev->of_node;  in arcxcnn_parse_dt()
186 	ret = of_property_read_string(node, "label", &lp->pdata->name);  in arcxcnn_parse_dt()
188 		lp->pdata->name = NULL;  in arcxcnn_parse_dt()
190 	ret = of_property_read_u32(node, "default-brightness", &prog_val);  in arcxcnn_parse_dt()
192 		lp->pdata->initial_brightness = prog_val;  in arcxcnn_parse_dt()
194 	ret = of_property_read_u32(node, "arc,led-config-0", &prog_val);  in arcxcnn_parse_dt()
196 		lp->pdata->led_config_0 = (u8)prog_val;  in arcxcnn_parse_dt()
198 	ret = of_property_read_u32(node, "arc,led-config-1", &prog_val);  in arcxcnn_parse_dt()
200 		lp->pdata->led_config_1 = (u8)prog_val;  in arcxcnn_parse_dt()
202 	ret = of_property_read_u32(node, "arc,dim-freq", &prog_val);  in arcxcnn_parse_dt()
204 		lp->pdata->dim_freq = (u8)prog_val;  in arcxcnn_parse_dt()
206 	ret = of_property_read_u32(node, "arc,comp-config", &prog_val);  in arcxcnn_parse_dt()
208 		lp->pdata->comp_config = (u8)prog_val;  in arcxcnn_parse_dt()
210 	ret = of_property_read_u32(node, "arc,filter-config", &prog_val);  in arcxcnn_parse_dt()
212 		lp->pdata->filter_config = (u8)prog_val;  in arcxcnn_parse_dt()
214 	ret = of_property_read_u32(node, "arc,trim-config", &prog_val);  in arcxcnn_parse_dt()
216 		lp->pdata->trim_config = (u8)prog_val;  in arcxcnn_parse_dt()
218 	ret = of_property_count_u32_elems(node, "led-sources");  in arcxcnn_parse_dt()
220 		lp->pdata->leden = ARCXCNN_LEDEN_MASK; /* all on is default */  in arcxcnn_parse_dt()
226 		ret = of_property_read_u32_array(node, "led-sources", sources,  in arcxcnn_parse_dt()
229 			dev_err(dev, "led-sources node is invalid.\n");  in arcxcnn_parse_dt()
233 		lp->pdata->leden = 0;  in arcxcnn_parse_dt()
239 			lp->pdata->leden |= onbit;  in arcxcnn_parse_dt()
249 	if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_BYTE_DATA))  in arcxcnn_probe()
250 		return -EIO;  in arcxcnn_probe()
252 	lp = devm_kzalloc(&cl->dev, sizeof(*lp), GFP_KERNEL);  in arcxcnn_probe()
254 		return -ENOMEM;  in arcxcnn_probe()
256 	lp->client = cl;  in arcxcnn_probe()
257 	lp->dev = &cl->dev;  in arcxcnn_probe()
258 	lp->pdata = dev_get_platdata(&cl->dev);  in arcxcnn_probe()
261 	ret = i2c_smbus_write_byte_data(lp->client,  in arcxcnn_probe()
266 	if (!lp->pdata) {  in arcxcnn_probe()
267 		lp->pdata = devm_kzalloc(lp->dev,  in arcxcnn_probe()
268 				sizeof(*lp->pdata), GFP_KERNEL);  in arcxcnn_probe()
269 		if (!lp->pdata)  in arcxcnn_probe()
270 			return -ENOMEM;  in arcxcnn_probe()
272 		/* Setup defaults based on power-on defaults */  in arcxcnn_probe()
273 		lp->pdata->name = NULL;  in arcxcnn_probe()
274 		lp->pdata->initial_brightness = INIT_BRIGHT;  in arcxcnn_probe()
275 		lp->pdata->leden = ARCXCNN_LEDEN_MASK;  in arcxcnn_probe()
277 		lp->pdata->led_config_0 = i2c_smbus_read_byte_data(  in arcxcnn_probe()
278 			lp->client, ARCXCNN_FADECTRL);  in arcxcnn_probe()
280 		lp->pdata->led_config_1 = i2c_smbus_read_byte_data(  in arcxcnn_probe()
281 			lp->client, ARCXCNN_ILED_CONFIG);  in arcxcnn_probe()
282 		/* insure dim mode is not default pwm */  in arcxcnn_probe()
283 		lp->pdata->led_config_1 |= ARCXCNN_ILED_DIM_INT;  in arcxcnn_probe()
285 		lp->pdata->dim_freq = i2c_smbus_read_byte_data(  in arcxcnn_probe()
286 			lp->client, ARCXCNN_DIMFREQ);  in arcxcnn_probe()
288 		lp->pdata->comp_config = i2c_smbus_read_byte_data(  in arcxcnn_probe()
289 			lp->client, ARCXCNN_COMP_CONFIG);  in arcxcnn_probe()
291 		lp->pdata->filter_config = i2c_smbus_read_byte_data(  in arcxcnn_probe()
292 			lp->client, ARCXCNN_FILT_CONFIG);  in arcxcnn_probe()
294 		lp->pdata->trim_config = i2c_smbus_read_byte_data(  in arcxcnn_probe()
295 			lp->client, ARCXCNN_IMAXTUNE);  in arcxcnn_probe()
304 	if (lp->pdata->initial_brightness > MAX_BRIGHTNESS)  in arcxcnn_probe()
305 		lp->pdata->initial_brightness = MAX_BRIGHTNESS;  in arcxcnn_probe()
307 	/* set initial brightness */  in arcxcnn_probe()
308 	ret = arcxcnn_set_brightness(lp, lp->pdata->initial_brightness);  in arcxcnn_probe()
313 	ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_FADECTRL,  in arcxcnn_probe()
314 		lp->pdata->led_config_0);  in arcxcnn_probe()
318 	ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_ILED_CONFIG,  in arcxcnn_probe()
319 		lp->pdata->led_config_1);  in arcxcnn_probe()
323 	ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_DIMFREQ,  in arcxcnn_probe()
324 		lp->pdata->dim_freq);  in arcxcnn_probe()
328 	ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_COMP_CONFIG,  in arcxcnn_probe()
329 		lp->pdata->comp_config);  in arcxcnn_probe()
333 	ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_FILT_CONFIG,  in arcxcnn_probe()
334 		lp->pdata->filter_config);  in arcxcnn_probe()
338 	ret = i2c_smbus_write_byte_data(lp->client, ARCXCNN_IMAXTUNE,  in arcxcnn_probe()
339 		lp->pdata->trim_config);  in arcxcnn_probe()
345 		ARCXCNN_LEDEN_MASK, lp->pdata->leden);  in arcxcnn_probe()
351 	backlight_update_status(lp->bl);  in arcxcnn_probe()
356 	dev_err(lp->dev,  in arcxcnn_probe()
360 	dev_err(lp->dev,  in arcxcnn_probe()
370 	i2c_smbus_write_byte_data(lp->client,  in arcxcnn_remove()
373 	i2c_smbus_write_byte_data(lp->client,  in arcxcnn_remove()
376 	lp->bl->props.brightness = 0;  in arcxcnn_remove()
378 	backlight_update_status(lp->bl);  in arcxcnn_remove()