diff options
Diffstat (limited to 'drivers/video/backlight')
| -rw-r--r-- | drivers/video/backlight/as3711_bl.c | 118 |
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 |