397 lines
10 KiB
C
397 lines
10 KiB
C
/*
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* Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
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*
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* Copyright 2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <linux/mfd/adp5520.h>
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#include <linux/slab.h>
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struct adp5520_bl {
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struct device *master;
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struct adp5520_backlight_platform_data *pdata;
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struct mutex lock;
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unsigned long cached_daylight_max;
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int id;
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int current_brightness;
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};
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static int adp5520_bl_set(struct backlight_device *bl, int brightness)
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{
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struct adp5520_bl *data = bl_get_data(bl);
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struct device *master = data->master;
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int ret = 0;
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if (data->pdata->en_ambl_sens) {
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if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
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/* Disable Ambient Light auto adjust */
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ret |= adp5520_clr_bits(master, ADP5520_BL_CONTROL,
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ADP5520_BL_AUTO_ADJ);
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
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brightness);
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} else {
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/*
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* MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
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* restore daylight l3 sysfs brightness
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*/
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
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data->cached_daylight_max);
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ret |= adp5520_set_bits(master, ADP5520_BL_CONTROL,
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ADP5520_BL_AUTO_ADJ);
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}
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} else {
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX, brightness);
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}
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if (data->current_brightness && brightness == 0)
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ret |= adp5520_set_bits(master,
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ADP5520_MODE_STATUS, ADP5520_DIM_EN);
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else if (data->current_brightness == 0 && brightness)
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ret |= adp5520_clr_bits(master,
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ADP5520_MODE_STATUS, ADP5520_DIM_EN);
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if (!ret)
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data->current_brightness = brightness;
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return ret;
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}
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static int adp5520_bl_update_status(struct backlight_device *bl)
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{
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int brightness = bl->props.brightness;
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if (bl->props.power != FB_BLANK_UNBLANK)
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brightness = 0;
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if (bl->props.fb_blank != FB_BLANK_UNBLANK)
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brightness = 0;
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return adp5520_bl_set(bl, brightness);
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}
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static int adp5520_bl_get_brightness(struct backlight_device *bl)
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{
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struct adp5520_bl *data = bl_get_data(bl);
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int error;
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uint8_t reg_val;
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error = adp5520_read(data->master, ADP5520_BL_VALUE, ®_val);
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return error ? data->current_brightness : reg_val;
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}
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static const struct backlight_ops adp5520_bl_ops = {
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.update_status = adp5520_bl_update_status,
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.get_brightness = adp5520_bl_get_brightness,
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};
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static int adp5520_bl_setup(struct backlight_device *bl)
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{
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struct adp5520_bl *data = bl_get_data(bl);
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struct device *master = data->master;
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struct adp5520_backlight_platform_data *pdata = data->pdata;
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int ret = 0;
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_MAX,
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pdata->l1_daylight_max);
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ret |= adp5520_write(master, ADP5520_DAYLIGHT_DIM,
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pdata->l1_daylight_dim);
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if (pdata->en_ambl_sens) {
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data->cached_daylight_max = pdata->l1_daylight_max;
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ret |= adp5520_write(master, ADP5520_OFFICE_MAX,
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pdata->l2_office_max);
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ret |= adp5520_write(master, ADP5520_OFFICE_DIM,
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pdata->l2_office_dim);
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ret |= adp5520_write(master, ADP5520_DARK_MAX,
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pdata->l3_dark_max);
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ret |= adp5520_write(master, ADP5520_DARK_DIM,
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pdata->l3_dark_dim);
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ret |= adp5520_write(master, ADP5520_L2_TRIP,
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pdata->l2_trip);
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ret |= adp5520_write(master, ADP5520_L2_HYS,
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pdata->l2_hyst);
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ret |= adp5520_write(master, ADP5520_L3_TRIP,
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pdata->l3_trip);
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ret |= adp5520_write(master, ADP5520_L3_HYS,
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pdata->l3_hyst);
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ret |= adp5520_write(master, ADP5520_ALS_CMPR_CFG,
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ALS_CMPR_CFG_VAL(pdata->abml_filt,
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ADP5520_L3_EN));
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}
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ret |= adp5520_write(master, ADP5520_BL_CONTROL,
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BL_CTRL_VAL(pdata->fade_led_law,
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pdata->en_ambl_sens));
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ret |= adp5520_write(master, ADP5520_BL_FADE, FADE_VAL(pdata->fade_in,
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pdata->fade_out));
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ret |= adp5520_set_bits(master, ADP5520_MODE_STATUS,
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ADP5520_BL_EN | ADP5520_DIM_EN);
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return ret;
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}
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static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
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{
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struct adp5520_bl *data = dev_get_drvdata(dev);
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int error;
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uint8_t reg_val;
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mutex_lock(&data->lock);
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error = adp5520_read(data->master, reg, ®_val);
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mutex_unlock(&data->lock);
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return sprintf(buf, "%u\n", reg_val);
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}
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static ssize_t adp5520_store(struct device *dev, const char *buf,
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size_t count, int reg)
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{
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struct adp5520_bl *data = dev_get_drvdata(dev);
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unsigned long val;
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int ret;
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ret = strict_strtoul(buf, 10, &val);
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if (ret)
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return ret;
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mutex_lock(&data->lock);
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adp5520_write(data->master, reg, val);
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mutex_unlock(&data->lock);
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return count;
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}
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static ssize_t adp5520_bl_dark_max_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return adp5520_show(dev, buf, ADP5520_DARK_MAX);
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}
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static ssize_t adp5520_bl_dark_max_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return adp5520_store(dev, buf, count, ADP5520_DARK_MAX);
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}
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static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
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adp5520_bl_dark_max_store);
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static ssize_t adp5520_bl_office_max_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return adp5520_show(dev, buf, ADP5520_OFFICE_MAX);
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}
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static ssize_t adp5520_bl_office_max_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return adp5520_store(dev, buf, count, ADP5520_OFFICE_MAX);
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}
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static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
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adp5520_bl_office_max_store);
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static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return adp5520_show(dev, buf, ADP5520_DAYLIGHT_MAX);
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}
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static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct adp5520_bl *data = dev_get_drvdata(dev);
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strict_strtoul(buf, 10, &data->cached_daylight_max);
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return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_MAX);
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}
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static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
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adp5520_bl_daylight_max_store);
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static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return adp5520_show(dev, buf, ADP5520_DARK_DIM);
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}
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static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return adp5520_store(dev, buf, count, ADP5520_DARK_DIM);
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}
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static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
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adp5520_bl_dark_dim_store);
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static ssize_t adp5520_bl_office_dim_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return adp5520_show(dev, buf, ADP5520_OFFICE_DIM);
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}
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static ssize_t adp5520_bl_office_dim_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return adp5520_store(dev, buf, count, ADP5520_OFFICE_DIM);
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}
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static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
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adp5520_bl_office_dim_store);
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static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return adp5520_show(dev, buf, ADP5520_DAYLIGHT_DIM);
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}
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static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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return adp5520_store(dev, buf, count, ADP5520_DAYLIGHT_DIM);
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}
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static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
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adp5520_bl_daylight_dim_store);
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static struct attribute *adp5520_bl_attributes[] = {
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&dev_attr_dark_max.attr,
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&dev_attr_dark_dim.attr,
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&dev_attr_office_max.attr,
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&dev_attr_office_dim.attr,
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&dev_attr_daylight_max.attr,
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&dev_attr_daylight_dim.attr,
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NULL
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};
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static const struct attribute_group adp5520_bl_attr_group = {
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.attrs = adp5520_bl_attributes,
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};
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static int __devinit adp5520_bl_probe(struct platform_device *pdev)
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{
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struct backlight_properties props;
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struct backlight_device *bl;
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struct adp5520_bl *data;
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int ret = 0;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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data->master = pdev->dev.parent;
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data->pdata = pdev->dev.platform_data;
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if (data->pdata == NULL) {
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dev_err(&pdev->dev, "missing platform data\n");
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kfree(data);
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return -ENODEV;
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}
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data->id = pdev->id;
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data->current_brightness = 0;
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mutex_init(&data->lock);
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memset(&props, 0, sizeof(struct backlight_properties));
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props.max_brightness = ADP5020_MAX_BRIGHTNESS;
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bl = backlight_device_register(pdev->name, data->master, data,
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&adp5520_bl_ops, &props);
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if (IS_ERR(bl)) {
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dev_err(&pdev->dev, "failed to register backlight\n");
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kfree(data);
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return PTR_ERR(bl);
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}
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bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
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if (data->pdata->en_ambl_sens)
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ret = sysfs_create_group(&bl->dev.kobj,
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&adp5520_bl_attr_group);
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if (ret) {
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dev_err(&pdev->dev, "failed to register sysfs\n");
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backlight_device_unregister(bl);
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kfree(data);
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}
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platform_set_drvdata(pdev, bl);
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ret |= adp5520_bl_setup(bl);
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backlight_update_status(bl);
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return ret;
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}
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static int __devexit adp5520_bl_remove(struct platform_device *pdev)
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{
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struct backlight_device *bl = platform_get_drvdata(pdev);
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struct adp5520_bl *data = bl_get_data(bl);
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adp5520_clr_bits(data->master, ADP5520_MODE_STATUS, ADP5520_BL_EN);
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if (data->pdata->en_ambl_sens)
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sysfs_remove_group(&bl->dev.kobj,
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&adp5520_bl_attr_group);
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backlight_device_unregister(bl);
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kfree(data);
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return 0;
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}
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#ifdef CONFIG_PM
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static int adp5520_bl_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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struct backlight_device *bl = platform_get_drvdata(pdev);
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return adp5520_bl_set(bl, 0);
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}
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static int adp5520_bl_resume(struct platform_device *pdev)
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{
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struct backlight_device *bl = platform_get_drvdata(pdev);
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backlight_update_status(bl);
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return 0;
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}
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#else
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#define adp5520_bl_suspend NULL
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#define adp5520_bl_resume NULL
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#endif
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static struct platform_driver adp5520_bl_driver = {
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.driver = {
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.name = "adp5520-backlight",
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.owner = THIS_MODULE,
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},
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.probe = adp5520_bl_probe,
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.remove = __devexit_p(adp5520_bl_remove),
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.suspend = adp5520_bl_suspend,
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.resume = adp5520_bl_resume,
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};
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static int __init adp5520_bl_init(void)
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{
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return platform_driver_register(&adp5520_bl_driver);
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}
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module_init(adp5520_bl_init);
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static void __exit adp5520_bl_exit(void)
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{
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platform_driver_unregister(&adp5520_bl_driver);
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}
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module_exit(adp5520_bl_exit);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:adp5520-backlight");
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