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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2013-04-30 03:17:55 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2013-04-30 05:28:18 +0400
commit59eb2b5e57eaf0ae70b7d8d51b051cb754724a7a (patch)
tree2157003b541647c40e126851acf40b36de7d8e6c /drivers/video
parent514f920a4a37bce427ec4aab591619b158e29115 (diff)
downloadlinux-59eb2b5e57eaf0ae70b7d8d51b051cb754724a7a.tar.xz
drivers/video/backlight/as3711_bl.c: add OF support
Add support for configuring AS3711 backlight driver from DT. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Reviewed-by: Mark 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: Jingoo Han <jg1.han@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/backlight/as3711_bl.c118
1 files changed, 117 insertions, 1 deletions
diff --git a/drivers/video/backlight/as3711_bl.c b/drivers/video/backlight/as3711_bl.c
index 41d52fe52543..123887cd76bd 100644
--- a/drivers/video/backlight/as3711_bl.c
+++ b/drivers/video/backlight/as3711_bl.c
@@ -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