diff options
Diffstat (limited to 'kernel/drivers/video/backlight/lm3533_bl.c')
-rw-r--r-- | kernel/drivers/video/backlight/lm3533_bl.c | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/kernel/drivers/video/backlight/lm3533_bl.c b/kernel/drivers/video/backlight/lm3533_bl.c new file mode 100644 index 000000000..0e2337f36 --- /dev/null +++ b/kernel/drivers/video/backlight/lm3533_bl.c @@ -0,0 +1,411 @@ +/* + * lm3533-bl.c -- LM3533 Backlight driver + * + * Copyright (C) 2011-2012 Texas Instruments + * + * Author: Johan Hovold <jhovold@gmail.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/backlight.h> +#include <linux/fb.h> +#include <linux/slab.h> + +#include <linux/mfd/lm3533.h> + + +#define LM3533_HVCTRLBANK_COUNT 2 +#define LM3533_BL_MAX_BRIGHTNESS 255 + +#define LM3533_REG_CTRLBANK_AB_BCONF 0x1a + + +struct lm3533_bl { + struct lm3533 *lm3533; + struct lm3533_ctrlbank cb; + struct backlight_device *bd; + int id; +}; + + +static inline int lm3533_bl_get_ctrlbank_id(struct lm3533_bl *bl) +{ + return bl->id; +} + +static int lm3533_bl_update_status(struct backlight_device *bd) +{ + struct lm3533_bl *bl = bl_get_data(bd); + int brightness = bd->props.brightness; + + if (bd->props.power != FB_BLANK_UNBLANK) + brightness = 0; + if (bd->props.fb_blank != FB_BLANK_UNBLANK) + brightness = 0; + + return lm3533_ctrlbank_set_brightness(&bl->cb, (u8)brightness); +} + +static int lm3533_bl_get_brightness(struct backlight_device *bd) +{ + struct lm3533_bl *bl = bl_get_data(bd); + u8 val; + int ret; + + ret = lm3533_ctrlbank_get_brightness(&bl->cb, &val); + if (ret) + return ret; + + return val; +} + +static const struct backlight_ops lm3533_bl_ops = { + .get_brightness = lm3533_bl_get_brightness, + .update_status = lm3533_bl_update_status, +}; + +static ssize_t show_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + + return scnprintf(buf, PAGE_SIZE, "%d\n", bl->id); +} + +static ssize_t show_als_channel(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + unsigned channel = lm3533_bl_get_ctrlbank_id(bl); + + return scnprintf(buf, PAGE_SIZE, "%u\n", channel); +} + +static ssize_t show_als_en(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + int ctrlbank = lm3533_bl_get_ctrlbank_id(bl); + u8 val; + u8 mask; + bool enable; + int ret; + + ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val); + if (ret) + return ret; + + mask = 1 << (2 * ctrlbank); + enable = val & mask; + + return scnprintf(buf, PAGE_SIZE, "%d\n", enable); +} + +static ssize_t store_als_en(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + int ctrlbank = lm3533_bl_get_ctrlbank_id(bl); + int enable; + u8 val; + u8 mask; + int ret; + + if (kstrtoint(buf, 0, &enable)) + return -EINVAL; + + mask = 1 << (2 * ctrlbank); + + if (enable) + val = mask; + else + val = 0; + + ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val, + mask); + if (ret) + return ret; + + return len; +} + +static ssize_t show_linear(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + u8 val; + u8 mask; + int linear; + int ret; + + ret = lm3533_read(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, &val); + if (ret) + return ret; + + mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1); + + if (val & mask) + linear = 1; + else + linear = 0; + + return scnprintf(buf, PAGE_SIZE, "%x\n", linear); +} + +static ssize_t store_linear(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + unsigned long linear; + u8 mask; + u8 val; + int ret; + + if (kstrtoul(buf, 0, &linear)) + return -EINVAL; + + mask = 1 << (2 * lm3533_bl_get_ctrlbank_id(bl) + 1); + + if (linear) + val = mask; + else + val = 0; + + ret = lm3533_update(bl->lm3533, LM3533_REG_CTRLBANK_AB_BCONF, val, + mask); + if (ret) + return ret; + + return len; +} + +static ssize_t show_pwm(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + u8 val; + int ret; + + ret = lm3533_ctrlbank_get_pwm(&bl->cb, &val); + if (ret) + return ret; + + return scnprintf(buf, PAGE_SIZE, "%u\n", val); +} + +static ssize_t store_pwm(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + u8 val; + int ret; + + if (kstrtou8(buf, 0, &val)) + return -EINVAL; + + ret = lm3533_ctrlbank_set_pwm(&bl->cb, val); + if (ret) + return ret; + + return len; +} + +static LM3533_ATTR_RO(als_channel); +static LM3533_ATTR_RW(als_en); +static LM3533_ATTR_RO(id); +static LM3533_ATTR_RW(linear); +static LM3533_ATTR_RW(pwm); + +static struct attribute *lm3533_bl_attributes[] = { + &dev_attr_als_channel.attr, + &dev_attr_als_en.attr, + &dev_attr_id.attr, + &dev_attr_linear.attr, + &dev_attr_pwm.attr, + NULL, +}; + +static umode_t lm3533_bl_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int n) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct lm3533_bl *bl = dev_get_drvdata(dev); + umode_t mode = attr->mode; + + if (attr == &dev_attr_als_channel.attr || + attr == &dev_attr_als_en.attr) { + if (!bl->lm3533->have_als) + mode = 0; + } + + return mode; +}; + +static struct attribute_group lm3533_bl_attribute_group = { + .is_visible = lm3533_bl_attr_is_visible, + .attrs = lm3533_bl_attributes +}; + +static int lm3533_bl_setup(struct lm3533_bl *bl, + struct lm3533_bl_platform_data *pdata) +{ + int ret; + + ret = lm3533_ctrlbank_set_max_current(&bl->cb, pdata->max_current); + if (ret) + return ret; + + return lm3533_ctrlbank_set_pwm(&bl->cb, pdata->pwm); +} + +static int lm3533_bl_probe(struct platform_device *pdev) +{ + struct lm3533 *lm3533; + struct lm3533_bl_platform_data *pdata; + struct lm3533_bl *bl; + struct backlight_device *bd; + struct backlight_properties props; + int ret; + + dev_dbg(&pdev->dev, "%s\n", __func__); + + lm3533 = dev_get_drvdata(pdev->dev.parent); + if (!lm3533) + return -EINVAL; + + pdata = dev_get_platdata(&pdev->dev); + if (!pdata) { + dev_err(&pdev->dev, "no platform data\n"); + return -EINVAL; + } + + if (pdev->id < 0 || pdev->id >= LM3533_HVCTRLBANK_COUNT) { + dev_err(&pdev->dev, "illegal backlight id %d\n", pdev->id); + return -EINVAL; + } + + bl = devm_kzalloc(&pdev->dev, sizeof(*bl), GFP_KERNEL); + if (!bl) + return -ENOMEM; + + bl->lm3533 = lm3533; + bl->id = pdev->id; + + bl->cb.lm3533 = lm3533; + bl->cb.id = lm3533_bl_get_ctrlbank_id(bl); + bl->cb.dev = NULL; /* until registered */ + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.max_brightness = LM3533_BL_MAX_BRIGHTNESS; + props.brightness = pdata->default_brightness; + bd = devm_backlight_device_register(&pdev->dev, pdata->name, + pdev->dev.parent, bl, &lm3533_bl_ops, + &props); + if (IS_ERR(bd)) { + dev_err(&pdev->dev, "failed to register backlight device\n"); + return PTR_ERR(bd); + } + + bl->bd = bd; + bl->cb.dev = &bl->bd->dev; + + platform_set_drvdata(pdev, bl); + + ret = sysfs_create_group(&bd->dev.kobj, &lm3533_bl_attribute_group); + if (ret < 0) { + dev_err(&pdev->dev, "failed to create sysfs attributes\n"); + return ret; + } + + backlight_update_status(bd); + + ret = lm3533_bl_setup(bl, pdata); + if (ret) + goto err_sysfs_remove; + + ret = lm3533_ctrlbank_enable(&bl->cb); + if (ret) + goto err_sysfs_remove; + + return 0; + +err_sysfs_remove: + sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group); + + return ret; +} + +static int lm3533_bl_remove(struct platform_device *pdev) +{ + struct lm3533_bl *bl = platform_get_drvdata(pdev); + struct backlight_device *bd = bl->bd; + + dev_dbg(&bd->dev, "%s\n", __func__); + + bd->props.power = FB_BLANK_POWERDOWN; + bd->props.brightness = 0; + + lm3533_ctrlbank_disable(&bl->cb); + sysfs_remove_group(&bd->dev.kobj, &lm3533_bl_attribute_group); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int lm3533_bl_suspend(struct device *dev) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + + dev_dbg(dev, "%s\n", __func__); + + return lm3533_ctrlbank_disable(&bl->cb); +} + +static int lm3533_bl_resume(struct device *dev) +{ + struct lm3533_bl *bl = dev_get_drvdata(dev); + + dev_dbg(dev, "%s\n", __func__); + + return lm3533_ctrlbank_enable(&bl->cb); +} +#endif + +static SIMPLE_DEV_PM_OPS(lm3533_bl_pm_ops, lm3533_bl_suspend, lm3533_bl_resume); + +static void lm3533_bl_shutdown(struct platform_device *pdev) +{ + struct lm3533_bl *bl = platform_get_drvdata(pdev); + + dev_dbg(&pdev->dev, "%s\n", __func__); + + lm3533_ctrlbank_disable(&bl->cb); +} + +static struct platform_driver lm3533_bl_driver = { + .driver = { + .name = "lm3533-backlight", + .pm = &lm3533_bl_pm_ops, + }, + .probe = lm3533_bl_probe, + .remove = lm3533_bl_remove, + .shutdown = lm3533_bl_shutdown, +}; +module_platform_driver(lm3533_bl_driver); + +MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); +MODULE_DESCRIPTION("LM3533 Backlight driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:lm3533-backlight"); |