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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>
hifive-unleashed-5.1
Guennadi Liakhovetski 2013-04-29 16:17:55 -07:00 committed by Linus Torvalds
parent 514f920a4a
commit 59eb2b5e57
1 changed files with 117 additions and 1 deletions
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118
drivers/video/backlight/as3711_bl.c
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@ -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