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Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight
* 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight: backlight: Add driver for Tabletkiosk Sahara TouchIT-213 Tablet PC backlight: da903x: Add backlight driver for DA9030/DA9034 tosa: add support for bl/lcd driver backlight: add support for Sharp SL-6000 LCD and backlight drivers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,201 @@ | ||
| /* | ||
| * Backlight driver for Dialog Semiconductor DA9030/DA9034 | ||
| * | ||
| * Copyright (C) 2008 Compulab, Ltd. | ||
| * Mike Rapoport <mike@compulab.co.il> | ||
| * | ||
| * Copyright (C) 2006-2008 Marvell International Ltd. | ||
| * Eric Miao <eric.miao@marvell.com> | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| */ | ||
|
|
||
| #include <linux/kernel.h> | ||
| #include <linux/init.h> | ||
| #include <linux/platform_device.h> | ||
| #include <linux/fb.h> | ||
| #include <linux/backlight.h> | ||
| #include <linux/mfd/da903x.h> | ||
|
|
||
| #define DA9030_WLED_CONTROL 0x25 | ||
| #define DA9030_WLED_CP_EN (1 << 6) | ||
| #define DA9030_WLED_TRIM(x) ((x) & 0x7) | ||
|
|
||
| #define DA9034_WLED_CONTROL1 0x3C | ||
| #define DA9034_WLED_CONTROL2 0x3D | ||
|
|
||
| #define DA9034_WLED_BOOST_EN (1 << 5) | ||
|
|
||
| #define DA9030_MAX_BRIGHTNESS 7 | ||
| #define DA9034_MAX_BRIGHTNESS 0x7f | ||
|
|
||
| struct da903x_backlight_data { | ||
| struct device *da903x_dev; | ||
| int id; | ||
| int current_brightness; | ||
| }; | ||
|
|
||
| static int da903x_backlight_set(struct backlight_device *bl, int brightness) | ||
| { | ||
| struct da903x_backlight_data *data = bl_get_data(bl); | ||
| struct device *dev = data->da903x_dev; | ||
| uint8_t val; | ||
| int ret = 0; | ||
|
|
||
| switch (data->id) { | ||
| case DA9034_ID_WLED: | ||
| ret = da903x_update(dev, DA9034_WLED_CONTROL1, | ||
| brightness, 0x7f); | ||
| if (ret) | ||
| return ret; | ||
|
|
||
| if (data->current_brightness && brightness == 0) | ||
| ret = da903x_clr_bits(dev, | ||
| DA9034_WLED_CONTROL2, | ||
| DA9034_WLED_BOOST_EN); | ||
|
|
||
| if (data->current_brightness == 0 && brightness) | ||
| ret = da903x_set_bits(dev, | ||
| DA9034_WLED_CONTROL2, | ||
| DA9034_WLED_BOOST_EN); | ||
| break; | ||
| case DA9030_ID_WLED: | ||
| val = DA9030_WLED_TRIM(brightness); | ||
| val |= brightness ? DA9030_WLED_CP_EN : 0; | ||
| ret = da903x_write(dev, DA9030_WLED_CONTROL, val); | ||
| break; | ||
| } | ||
|
|
||
| if (ret) | ||
| return ret; | ||
|
|
||
| data->current_brightness = brightness; | ||
| return 0; | ||
| } | ||
|
|
||
| static int da903x_backlight_update_status(struct backlight_device *bl) | ||
| { | ||
| int brightness = bl->props.brightness; | ||
|
|
||
| if (bl->props.power != FB_BLANK_UNBLANK) | ||
| brightness = 0; | ||
|
|
||
| if (bl->props.fb_blank != FB_BLANK_UNBLANK) | ||
| brightness = 0; | ||
|
|
||
| return da903x_backlight_set(bl, brightness); | ||
| } | ||
|
|
||
| static int da903x_backlight_get_brightness(struct backlight_device *bl) | ||
| { | ||
| struct da903x_backlight_data *data = bl_get_data(bl); | ||
| return data->current_brightness; | ||
| } | ||
|
|
||
| static struct backlight_ops da903x_backlight_ops = { | ||
| .update_status = da903x_backlight_update_status, | ||
| .get_brightness = da903x_backlight_get_brightness, | ||
| }; | ||
|
|
||
| static int da903x_backlight_probe(struct platform_device *pdev) | ||
| { | ||
| struct da903x_backlight_data *data; | ||
| struct backlight_device *bl; | ||
| int max_brightness; | ||
|
|
||
| data = kzalloc(sizeof(*data), GFP_KERNEL); | ||
| if (data == NULL) | ||
| return -ENOMEM; | ||
|
|
||
| switch (pdev->id) { | ||
| case DA9030_ID_WLED: | ||
| max_brightness = DA9030_MAX_BRIGHTNESS; | ||
| break; | ||
| case DA9034_ID_WLED: | ||
| max_brightness = DA9034_MAX_BRIGHTNESS; | ||
| break; | ||
| default: | ||
| dev_err(&pdev->dev, "invalid backlight device ID(%d)\n", | ||
| pdev->id); | ||
| return -EINVAL; | ||
| } | ||
|
|
||
| data->id = pdev->id; | ||
| data->da903x_dev = pdev->dev.parent; | ||
| data->current_brightness = 0; | ||
|
|
||
| bl = backlight_device_register(pdev->name, data->da903x_dev, | ||
| data, &da903x_backlight_ops); | ||
| if (IS_ERR(bl)) { | ||
| dev_err(&pdev->dev, "failed to register backlight\n"); | ||
| return PTR_ERR(bl); | ||
| } | ||
|
|
||
| bl->props.max_brightness = max_brightness; | ||
| bl->props.brightness = max_brightness; | ||
|
|
||
| platform_set_drvdata(pdev, bl); | ||
| backlight_update_status(bl); | ||
| return 0; | ||
| } | ||
|
|
||
| static int da903x_backlight_remove(struct platform_device *pdev) | ||
| { | ||
| struct backlight_device *bl = platform_get_drvdata(pdev); | ||
| struct da903x_backlight_data *data = bl_get_data(bl); | ||
|
|
||
| backlight_device_unregister(bl); | ||
| kfree(data); | ||
| return 0; | ||
| } | ||
|
|
||
| #ifdef CONFIG_PM | ||
| static int da903x_backlight_suspend(struct platform_device *pdev, | ||
| pm_message_t state) | ||
| { | ||
| struct backlight_device *bl = platform_get_drvdata(pdev); | ||
| return da903x_backlight_set(bl, 0); | ||
| } | ||
|
|
||
| static int da903x_backlight_resume(struct platform_device *pdev) | ||
| { | ||
| struct backlight_device *bl = platform_get_drvdata(pdev); | ||
|
|
||
| backlight_update_status(bl); | ||
| return 0; | ||
| } | ||
| #else | ||
| #define da903x_backlight_suspend NULL | ||
| #define da903x_backlight_resume NULL | ||
| #endif | ||
|
|
||
| static struct platform_driver da903x_backlight_driver = { | ||
| .driver = { | ||
| .name = "da903x-backlight", | ||
| .owner = THIS_MODULE, | ||
| }, | ||
| .probe = da903x_backlight_probe, | ||
| .remove = da903x_backlight_remove, | ||
| .suspend = da903x_backlight_suspend, | ||
| .resume = da903x_backlight_resume, | ||
| }; | ||
|
|
||
| static int __init da903x_backlight_init(void) | ||
| { | ||
| return platform_driver_register(&da903x_backlight_driver); | ||
| } | ||
| module_init(da903x_backlight_init); | ||
|
|
||
| static void __exit da903x_backlight_exit(void) | ||
| { | ||
| platform_driver_unregister(&da903x_backlight_driver); | ||
| } | ||
| module_exit(da903x_backlight_exit); | ||
|
|
||
| MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034"); | ||
| MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>" | ||
| "Mike Rapoport <mike@compulab.co.il>"); | ||
| MODULE_LICENSE("GPL"); | ||
| MODULE_ALIAS("platform:da903x-backlight"); |
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