backlight: new driver for ADP5520/ADP5501 MFD PMICs
authorMichael Hennerich <michael.hennerich@analog.com>
Thu, 17 Sep 2009 18:29:52 +0000 (14:29 -0400)
committerRichard Purdie <rpurdie@linux.intel.com>
Sat, 26 Sep 2009 15:48:08 +0000 (16:48 +0100)
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
drivers/video/backlight/Kconfig
drivers/video/backlight/Makefile
drivers/video/backlight/adp5520_bl.c [new file with mode: 0644]

index 22a49944d98da4a80686b652c3f9d8b3b370c741..8b3bc71ddb0473e4803cc094b9fdfad1756be274 100644 (file)
@@ -251,3 +251,14 @@ config BACKLIGHT_ADX
        help
          Say Y to enable the backlight driver on Avionic Design Xanthos-based
          boards.
+
+config BACKLIGHT_ADP5520
+       tristate "Backlight Driver for ADP5520/ADP5501 using WLED"
+       depends on BACKLIGHT_CLASS_DEVICE && PMIC_ADP5520
+       help
+         If you have a LCD backlight connected to the BST/BL_SNK output of
+         ADP5520 or ADP5501, say Y here to enable this driver.
+
+         To compile this driver as a module, choose M here: the module will
+         be called adp5520_bl.
+
index a483709205ace2b4b402a4a3a74597896e113c2b..9a405548874c74e5f7ede64283c4764fb3512758 100644 (file)
@@ -27,3 +27,5 @@ obj-$(CONFIG_BACKLIGHT_TOSA)  += tosa_bl.o
 obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o
 obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o
 obj-$(CONFIG_BACKLIGHT_ADX)    += adx_bl.o
+obj-$(CONFIG_BACKLIGHT_ADP5520)        += adp5520_bl.o
+
diff --git a/drivers/video/backlight/adp5520_bl.c b/drivers/video/backlight/adp5520_bl.c
new file mode 100644 (file)
index 0000000..ad05da5
--- /dev/null
@@ -0,0 +1,377 @@
+/*
+ * Backlight driver for Analog Devices ADP5520/ADP5501 MFD PMICs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/mfd/adp5520.h>
+
+struct adp5520_bl {
+       struct device *master;
+       struct adp5520_backlight_platfrom_data *pdata;
+       struct mutex lock;
+       unsigned long cached_daylight_max;
+       int id;
+       int current_brightness;
+};
+
+static int adp5520_bl_set(struct backlight_device *bl, int brightness)
+{
+       struct adp5520_bl *data = bl_get_data(bl);
+       struct device *master = data->master;
+       int ret = 0;
+
+       if (data->pdata->en_ambl_sens) {
+               if ((brightness > 0) && (brightness < ADP5020_MAX_BRIGHTNESS)) {
+                       /* Disable Ambient Light auto adjust */
+                       ret |= adp5520_clr_bits(master, BL_CONTROL,
+                                       BL_AUTO_ADJ);
+                       ret |= adp5520_write(master, DAYLIGHT_MAX, brightness);
+               } else {
+                       /*
+                        * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust
+                        * restore daylight l3 sysfs brightness
+                        */
+                       ret |= adp5520_write(master, DAYLIGHT_MAX,
+                                        data->cached_daylight_max);
+                       ret |= adp5520_set_bits(master, BL_CONTROL,
+                                        BL_AUTO_ADJ);
+               }
+       } else {
+               ret |= adp5520_write(master, DAYLIGHT_MAX, brightness);
+       }
+
+       if (data->current_brightness && brightness == 0)
+               ret |= adp5520_set_bits(master,
+                               MODE_STATUS, DIM_EN);
+       else if (data->current_brightness == 0 && brightness)
+               ret |= adp5520_clr_bits(master,
+                               MODE_STATUS, DIM_EN);
+
+       if (!ret)
+               data->current_brightness = brightness;
+
+       return ret;
+}
+
+static int adp5520_bl_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 adp5520_bl_set(bl, brightness);
+}
+
+static int adp5520_bl_get_brightness(struct backlight_device *bl)
+{
+       struct adp5520_bl *data = bl_get_data(bl);
+       int error;
+       uint8_t reg_val;
+
+       error = adp5520_read(data->master, BL_VALUE, &reg_val);
+
+       return error ? data->current_brightness : reg_val;
+}
+
+static struct backlight_ops adp5520_bl_ops = {
+       .update_status  = adp5520_bl_update_status,
+       .get_brightness = adp5520_bl_get_brightness,
+};
+
+static int adp5520_bl_setup(struct backlight_device *bl)
+{
+       struct adp5520_bl *data = bl_get_data(bl);
+       struct device *master = data->master;
+       struct adp5520_backlight_platfrom_data *pdata = data->pdata;
+       int ret = 0;
+
+       ret |= adp5520_write(master, DAYLIGHT_MAX, pdata->l1_daylight_max);
+       ret |= adp5520_write(master, DAYLIGHT_DIM, pdata->l1_daylight_dim);
+
+       if (pdata->en_ambl_sens) {
+               data->cached_daylight_max = pdata->l1_daylight_max;
+               ret |= adp5520_write(master, OFFICE_MAX, pdata->l2_office_max);
+               ret |= adp5520_write(master, OFFICE_DIM, pdata->l2_office_dim);
+               ret |= adp5520_write(master, DARK_MAX, pdata->l3_dark_max);
+               ret |= adp5520_write(master, DARK_DIM, pdata->l3_dark_dim);
+               ret |= adp5520_write(master, L2_TRIP, pdata->l2_trip);
+               ret |= adp5520_write(master, L2_HYS, pdata->l2_hyst);
+               ret |= adp5520_write(master, L3_TRIP, pdata->l3_trip);
+               ret |= adp5520_write(master, L3_HYS, pdata->l3_hyst);
+               ret |= adp5520_write(master, ALS_CMPR_CFG,
+                       ALS_CMPR_CFG_VAL(pdata->abml_filt, L3_EN));
+       }
+
+       ret |= adp5520_write(master, BL_CONTROL,
+                       BL_CTRL_VAL(pdata->fade_led_law, pdata->en_ambl_sens));
+
+       ret |= adp5520_write(master, BL_FADE, FADE_VAL(pdata->fade_in,
+                       pdata->fade_out));
+
+       ret |= adp5520_set_bits(master, MODE_STATUS, BL_EN | DIM_EN);
+
+       return ret;
+}
+
+static ssize_t adp5520_show(struct device *dev, char *buf, int reg)
+{
+       struct adp5520_bl *data = dev_get_drvdata(dev);
+       int error;
+       uint8_t reg_val;
+
+       mutex_lock(&data->lock);
+       error = adp5520_read(data->master, reg, &reg_val);
+       mutex_unlock(&data->lock);
+
+       return sprintf(buf, "%u\n", reg_val);
+}
+
+static ssize_t adp5520_store(struct device *dev, const char *buf,
+                        size_t count, int reg)
+{
+       struct adp5520_bl *data = dev_get_drvdata(dev);
+       unsigned long val;
+       int ret;
+
+       ret = strict_strtoul(buf, 10, &val);
+       if (ret)
+               return ret;
+
+       mutex_lock(&data->lock);
+       adp5520_write(data->master, reg, val);
+       mutex_unlock(&data->lock);
+
+       return count;
+}
+
+static ssize_t adp5520_bl_dark_max_show(struct device *dev,
+               struct device_attribute *attr, char *buf)
+{
+       return adp5520_show(dev, buf, DARK_MAX);
+}
+
+static ssize_t adp5520_bl_dark_max_store(struct device *dev,
+               struct device_attribute *attr, const char *buf, size_t count)
+{
+       return adp5520_store(dev, buf, count, DARK_MAX);
+}
+static DEVICE_ATTR(dark_max, 0664, adp5520_bl_dark_max_show,
+                       adp5520_bl_dark_max_store);
+
+static ssize_t adp5520_bl_office_max_show(struct device *dev,
+                                    struct device_attribute *attr, char *buf)
+{
+       return adp5520_show(dev, buf, OFFICE_MAX);
+}
+
+static ssize_t adp5520_bl_office_max_store(struct device *dev,
+               struct device_attribute *attr, const char *buf, size_t count)
+{
+       return adp5520_store(dev, buf, count, OFFICE_MAX);
+}
+static DEVICE_ATTR(office_max, 0664, adp5520_bl_office_max_show,
+                       adp5520_bl_office_max_store);
+
+static ssize_t adp5520_bl_daylight_max_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       return adp5520_show(dev, buf, DAYLIGHT_MAX);
+}
+
+static ssize_t adp5520_bl_daylight_max_store(struct device *dev,
+               struct device_attribute *attr, const char *buf, size_t count)
+{
+       struct adp5520_bl *data = dev_get_drvdata(dev);
+
+       strict_strtoul(buf, 10, &data->cached_daylight_max);
+       return adp5520_store(dev, buf, count, DAYLIGHT_MAX);
+}
+static DEVICE_ATTR(daylight_max, 0664, adp5520_bl_daylight_max_show,
+                       adp5520_bl_daylight_max_store);
+
+static ssize_t adp5520_bl_dark_dim_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       return adp5520_show(dev, buf, DARK_DIM);
+}
+
+static ssize_t adp5520_bl_dark_dim_store(struct device *dev,
+                                    struct device_attribute *attr,
+                                    const char *buf, size_t count)
+{
+       return adp5520_store(dev, buf, count, DARK_DIM);
+}
+static DEVICE_ATTR(dark_dim, 0664, adp5520_bl_dark_dim_show,
+                       adp5520_bl_dark_dim_store);
+
+static ssize_t adp5520_bl_office_dim_show(struct device *dev,
+                       struct device_attribute *attr, char *buf)
+{
+       return adp5520_show(dev, buf, OFFICE_DIM);
+}
+
+static ssize_t adp5520_bl_office_dim_store(struct device *dev,
+                                    struct device_attribute *attr,
+                                    const char *buf, size_t count)
+{
+       return adp5520_store(dev, buf, count, OFFICE_DIM);
+}
+static DEVICE_ATTR(office_dim, 0664, adp5520_bl_office_dim_show,
+                       adp5520_bl_office_dim_store);
+
+static ssize_t adp5520_bl_daylight_dim_show(struct device *dev,
+                                    struct device_attribute *attr, char *buf)
+{
+       return adp5520_show(dev, buf, DAYLIGHT_DIM);
+}
+
+static ssize_t adp5520_bl_daylight_dim_store(struct device *dev,
+                                    struct device_attribute *attr,
+                                    const char *buf, size_t count)
+{
+       return adp5520_store(dev, buf, count, DAYLIGHT_DIM);
+}
+static DEVICE_ATTR(daylight_dim, 0664, adp5520_bl_daylight_dim_show,
+                       adp5520_bl_daylight_dim_store);
+
+static struct attribute *adp5520_bl_attributes[] = {
+       &dev_attr_dark_max.attr,
+       &dev_attr_dark_dim.attr,
+       &dev_attr_office_max.attr,
+       &dev_attr_office_dim.attr,
+       &dev_attr_daylight_max.attr,
+       &dev_attr_daylight_dim.attr,
+       NULL
+};
+
+static const struct attribute_group adp5520_bl_attr_group = {
+       .attrs = adp5520_bl_attributes,
+};
+
+static int __devinit adp5520_bl_probe(struct platform_device *pdev)
+{
+       struct backlight_device *bl;
+       struct adp5520_bl *data;
+       int ret = 0;
+
+       data = kzalloc(sizeof(*data), GFP_KERNEL);
+       if (data == NULL)
+               return -ENOMEM;
+
+       data->master = pdev->dev.parent;
+       data->pdata = pdev->dev.platform_data;
+
+       if (data->pdata  == NULL) {
+               dev_err(&pdev->dev, "missing platform data\n");
+               kfree(data);
+               return -ENODEV;
+       }
+
+       data->id = pdev->id;
+       data->current_brightness = 0;
+
+       mutex_init(&data->lock);
+
+       bl = backlight_device_register(pdev->name, data->master,
+                       data, &adp5520_bl_ops);
+       if (IS_ERR(bl)) {
+               dev_err(&pdev->dev, "failed to register backlight\n");
+               kfree(data);
+               return PTR_ERR(bl);
+       }
+
+       bl->props.max_brightness =
+               bl->props.brightness = ADP5020_MAX_BRIGHTNESS;
+
+       if (data->pdata->en_ambl_sens)
+               ret = sysfs_create_group(&bl->dev.kobj,
+                       &adp5520_bl_attr_group);
+
+       if (ret) {
+               dev_err(&pdev->dev, "failed to register sysfs\n");
+               backlight_device_unregister(bl);
+               kfree(data);
+       }
+
+       platform_set_drvdata(pdev, bl);
+       ret |= adp5520_bl_setup(bl);
+       backlight_update_status(bl);
+
+       return ret;
+}
+
+static int __devexit adp5520_bl_remove(struct platform_device *pdev)
+{
+       struct backlight_device *bl = platform_get_drvdata(pdev);
+       struct adp5520_bl *data = bl_get_data(bl);
+
+       adp5520_clr_bits(data->master, MODE_STATUS, BL_EN);
+
+       if (data->pdata->en_ambl_sens)
+               sysfs_remove_group(&bl->dev.kobj,
+                               &adp5520_bl_attr_group);
+
+       backlight_device_unregister(bl);
+       kfree(data);
+
+       return 0;
+}
+
+#ifdef CONFIG_PM
+static int adp5520_bl_suspend(struct platform_device *pdev,
+                                pm_message_t state)
+{
+       struct backlight_device *bl = platform_get_drvdata(pdev);
+       return adp5520_bl_set(bl, 0);
+}
+
+static int adp5520_bl_resume(struct platform_device *pdev)
+{
+       struct backlight_device *bl = platform_get_drvdata(pdev);
+
+       backlight_update_status(bl);
+       return 0;
+}
+#else
+#define adp5520_bl_suspend     NULL
+#define adp5520_bl_resume      NULL
+#endif
+
+static struct platform_driver adp5520_bl_driver = {
+       .driver         = {
+               .name   = "adp5520-backlight",
+               .owner  = THIS_MODULE,
+       },
+       .probe          = adp5520_bl_probe,
+       .remove         = __devexit_p(adp5520_bl_remove),
+       .suspend        = adp5520_bl_suspend,
+       .resume         = adp5520_bl_resume,
+};
+
+static int __init adp5520_bl_init(void)
+{
+       return platform_driver_register(&adp5520_bl_driver);
+}
+module_init(adp5520_bl_init);
+
+static void __exit adp5520_bl_exit(void)
+{
+       platform_driver_unregister(&adp5520_bl_driver);
+}
+module_exit(adp5520_bl_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("ADP5520(01) Backlight Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-backlight");