video/backlight/pwm_bl.c

26 	unsigned int		*levels;
82 	if (pb->levels)
83 		duty_cycle = pb->levels[brightness];
201 	 * Once we have 4096 levels there's little point going much higher...
208 	data->levels = devm_kcalloc(dev, data->max_brightness,
209 				    sizeof(*data->levels), GFP_KERNEL);
210 	if (!data->levels)
220 		data->levels[i] = (unsigned int)retval;
255 	 * Determine the number of brightness levels, if this property is not
256 	 * set a default table of brightness levels will be used.
258 	prop = of_find_property(node, "brightness-levels", &length);
264 	/* read brightness levels from DT property */
266 		data->levels = devm_kcalloc(dev, num_levels,
267 					    sizeof(*data->levels), GFP_KERNEL);
268 		if (!data->levels)
271 		ret = of_property_read_u32_array(node, "brightness-levels",
272 						 data->levels,
286 		 * interpolation between each of the values of brightness levels
294 		 * brightness-levels table, otherwise we can't interpolate
310 			 * Recalculate the number of brightness levels, now
312 			 * steps between two levels.
315 			dev_dbg(dev, "new number of brightness levels: %d\n",
319 			 * Create a new table of brightness levels with all the
334 				y1 = data->levels[i];
335 				y2 = data->levels[i + 1];
348 			 * brightness levels table and replace for the
351 			devm_kfree(dev, data->levels);
352 			data->levels = table;
386 	unsigned int min_val = data->levels[0];
387 	unsigned int max_val = data->levels[nlevels - 1];
399 		unsigned int delta = abs(linear_value - data->levels[i]);
542 	if (data->levels) {
543 		pb->levels = data->levels;
546 		 * For the DT case, only when brightness levels is defined
547 		 * data->levels is filled. For the non-DT case, data->levels
551 			if (data->levels[i] > pb->scale)
552 				pb->scale = data->levels[i];
560 		 * If no brightness levels are provided and max_brightness is
562 		 * max_brightness is set to 0 when brightness levels is not
579 			if (data->levels[i] > pb->scale)
580 				pb->scale = data->levels[i];
582 			pb->levels = data->levels;