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