Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 59eb2b5e authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Linus Torvalds
Browse files

drivers/video/backlight/as3711_bl.c: add OF support 



Add support for configuring AS3711 backlight driver from DT.

Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Reviewed-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Acked-by: default avatarJingoo Han <jg1.han@samsung.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 514f920a

drivers/video/backlight/as3711_bl.c

+117 −1
Original line number Diff line number Diff line
@@ -258,6 +258,109 @@ static int as3711_bl_register(struct platform_device *pdev, 
	return 0;

}



static int as3711_backlight_parse_dt(struct device *dev)

{

	struct as3711_bl_pdata *pdata = dev_get_platdata(dev);

	struct device_node *bl =

		of_find_node_by_name(dev->parent->of_node, "backlight"), *fb;

	int ret;



	if (!bl) {

		dev_dbg(dev, "backlight node not found\n");

		return -ENODEV;

	}



	fb = of_parse_phandle(bl, "su1-dev", 0);

	if (fb) {

		pdata->su1_fb = fb->full_name;



		ret = of_property_read_u32(bl, "su1-max-uA", &pdata->su1_max_uA);

		if (pdata->su1_max_uA <= 0)

			ret = -EINVAL;

		if (ret < 0)

			return ret;

	}



	fb = of_parse_phandle(bl, "su2-dev", 0);

	if (fb) {

		int count = 0;



		pdata->su2_fb = fb->full_name;



		ret = of_property_read_u32(bl, "su2-max-uA", &pdata->su2_max_uA);

		if (pdata->su2_max_uA <= 0)

			ret = -EINVAL;

		if (ret < 0)

			return ret;



		if (of_find_property(bl, "su2-feedback-voltage", NULL)) {

			pdata->su2_feedback = AS3711_SU2_VOLTAGE;

			count++;

		}

		if (of_find_property(bl, "su2-feedback-curr1", NULL)) {

			pdata->su2_feedback = AS3711_SU2_CURR1;

			count++;

		}

		if (of_find_property(bl, "su2-feedback-curr2", NULL)) {

			pdata->su2_feedback = AS3711_SU2_CURR2;

			count++;

		}

		if (of_find_property(bl, "su2-feedback-curr3", NULL)) {

			pdata->su2_feedback = AS3711_SU2_CURR3;

			count++;

		}

		if (of_find_property(bl, "su2-feedback-curr-auto", NULL)) {

			pdata->su2_feedback = AS3711_SU2_CURR_AUTO;

			count++;

		}

		if (count != 1)

			return -EINVAL;



		count = 0;

		if (of_find_property(bl, "su2-fbprot-lx-sd4", NULL)) {

			pdata->su2_fbprot = AS3711_SU2_LX_SD4;

			count++;

		}

		if (of_find_property(bl, "su2-fbprot-gpio2", NULL)) {

			pdata->su2_fbprot = AS3711_SU2_GPIO2;

			count++;

		}

		if (of_find_property(bl, "su2-fbprot-gpio3", NULL)) {

			pdata->su2_fbprot = AS3711_SU2_GPIO3;

			count++;

		}

		if (of_find_property(bl, "su2-fbprot-gpio4", NULL)) {

			pdata->su2_fbprot = AS3711_SU2_GPIO4;

			count++;

		}

		if (count != 1)

			return -EINVAL;



		count = 0;

		if (of_find_property(bl, "su2-auto-curr1", NULL)) {

			pdata->su2_auto_curr1 = true;

			count++;

		}

		if (of_find_property(bl, "su2-auto-curr2", NULL)) {

			pdata->su2_auto_curr2 = true;

			count++;

		}

		if (of_find_property(bl, "su2-auto-curr3", NULL)) {

			pdata->su2_auto_curr3 = true;

			count++;

		}



		/*

		 * At least one su2-auto-curr* must be specified iff

		 * AS3711_SU2_CURR_AUTO is used

		 */

		if (!count ^ (pdata->su2_feedback != AS3711_SU2_CURR_AUTO))

			return -EINVAL;

	}



	return 0;

}



static int as3711_backlight_probe(struct platform_device *pdev)

{

	struct as3711_bl_pdata *pdata = dev_get_platdata(&pdev->dev);
@@ -267,11 +370,24 @@ static int as3711_backlight_probe(struct platform_device *pdev) 
	unsigned int max_brightness;

	int ret;



	if (!pdata || (!pdata->su1_fb && !pdata->su2_fb)) {

	if (!pdata) {

		dev_err(&pdev->dev, "No platform data, exiting...\n");

		return -ENODEV;

	}



	if (pdev->dev.parent->of_node) {

		ret = as3711_backlight_parse_dt(&pdev->dev);

		if (ret < 0) {

			dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);

			return ret;

		}

	}



	if (!pdata->su1_fb && !pdata->su2_fb) {

		dev_err(&pdev->dev, "No framebuffer specified\n");

		return -EINVAL;

	}



	/*

	 * Due to possible hardware damage I chose to block all modes,

	 * unsupported on my hardware. Anyone, wishing to use any of those modes