leds: Add driver for ADP5520/ADP5501 MFD PMICs

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>

3 files changed, 241 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index e2b7a5382ae6..f12a99676628 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -253,6 +253,16 @@ config LEDS_LT3593
           LT3593 controller. This controller uses a special one-wire pulse
           coding protocol to set the brightness.
 
+config LEDS_ADP5520
+        tristate "LED Support for ADP5520/ADP5501 PMIC"
+        depends on LEDS_CLASS && PMIC_ADP5520
+        help
+          This option enables support for on-chip LED drivers found
+          on Analog Devices ADP5520/ADP5501 PMICs.
+
+          To compile this driver as a module, choose M here: the module will
+          be called leds-adp5520.
+
 comment "LED Triggers"
 
 config LEDS_TRIGGERS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index eb5a141d825c..176f0c674751 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_LEDS_WM8350)		+= leds-wm8350.o
 obj-$(CONFIG_LEDS_PWM)                  += leds-pwm.o
 obj-$(CONFIG_LEDS_INTEL_SS4200)         += leds-ss4200.o
 obj-$(CONFIG_LEDS_LT3593)               += leds-lt3593.o
+obj-$(CONFIG_LEDS_ADP5520)              += leds-adp5520.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)           += leds-dac124s085.o
diff --git a/drivers/leds/leds-adp5520.c b/drivers/leds/leds-adp5520.c
new file mode 100644
index 000000000000..a8f315902131
--- /dev/null
+++ b/drivers/leds/leds-adp5520.c
@@ -0,0 +1,230 @@
+/*
+ * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Loosely derived from leds-da903x:
+ * Copyright (C) 2008 Compulab, Ltd.
+ *      Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ *      Eric Miao <eric.miao@marvell.com>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/adp5520.h>
+
+struct adp5520_led {
+        struct led_classdev     cdev;
+        struct work_struct      work;
+        struct device           *master;
+        enum led_brightness     new_brightness;
+        int                     id;
+        int                     flags;
+};
+
+static void adp5520_led_work(struct work_struct *work)
+{
+        struct adp5520_led *led = container_of(work, struct adp5520_led, work);
+        adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1,
+                         led->new_brightness >> 2);
+}
+
+static void adp5520_led_set(struct led_classdev *led_cdev,
+                           enum led_brightness value)
+{
+        struct adp5520_led *led;
+
+        led = container_of(led_cdev, struct adp5520_led, cdev);
+        led->new_brightness = value;
+        schedule_work(&led->work);
+}
+
+static int adp5520_led_setup(struct adp5520_led *led)
+{
+        struct device *dev = led->master;
+        int flags = led->flags;
+        int ret = 0;
+
+        switch (led->id) {
+        case FLAG_ID_ADP5520_LED1_ADP5501_LED0:
+                ret |= adp5520_set_bits(dev, ADP5520_LED_TIME,
+                                        (flags >> ADP5520_FLAG_OFFT_SHIFT) &
+                                        ADP5520_FLAG_OFFT_MASK);
+                ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
+                                        ADP5520_LED1_EN);
+                break;
+        case FLAG_ID_ADP5520_LED2_ADP5501_LED1:
+                ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
+                                        ((flags >> ADP5520_FLAG_OFFT_SHIFT) &
+                                        ADP5520_FLAG_OFFT_MASK) << 2);
+                ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
+                                         ADP5520_R3_MODE);
+                ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
+                                        ADP5520_LED2_EN);
+                break;
+        case FLAG_ID_ADP5520_LED3_ADP5501_LED2:
+                ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
+                                        ((flags >> ADP5520_FLAG_OFFT_SHIFT) &
+                                        ADP5520_FLAG_OFFT_MASK) << 4);
+                ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
+                                        ADP5520_C3_MODE);
+                ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
+                                        ADP5520_LED3_EN);
+                break;
+        }
+
+        return ret;
+}
+
+static int __devinit adp5520_led_prepare(struct platform_device *pdev)
+{
+        struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
+        struct device *dev = pdev->dev.parent;
+        int ret = 0;
+
+        ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0);
+        ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0);
+        ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0);
+        ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6);
+        ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in,
+                 pdata->fade_out));
+
+        return ret;
+}
+
+static int __devinit adp5520_led_probe(struct platform_device *pdev)
+{
+        struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
+        struct adp5520_led *led, *led_dat;
+        struct led_info *cur_led;
+        int ret, i;
+
+        if (pdata == NULL) {
+                dev_err(&pdev->dev, "missing platform data\n");
+                return -ENODEV;
+        }
+
+        if (pdata->num_leds > ADP5520_01_MAXLEDS) {
+                dev_err(&pdev->dev, "can't handle more than %d LEDS\n",
+                                 ADP5520_01_MAXLEDS);
+                return -EFAULT;
+        }
+
+        led = kzalloc(sizeof(*led) * pdata->num_leds, GFP_KERNEL);
+        if (led == NULL) {
+                dev_err(&pdev->dev, "failed to alloc memory\n");
+                return -ENOMEM;
+        }
+
+        ret = adp5520_led_prepare(pdev);
+
+        if (ret) {
+                dev_err(&pdev->dev, "failed to write\n");
+                goto err_free;
+        }
+
+        for (i = 0; i < pdata->num_leds; ++i) {
+                cur_led = &pdata->leds[i];
+                led_dat = &led[i];
+
+                led_dat->cdev.name = cur_led->name;
+                led_dat->cdev.default_trigger = cur_led->default_trigger;
+                led_dat->cdev.brightness_set = adp5520_led_set;
+                led_dat->cdev.brightness = LED_OFF;
+
+                if (cur_led->flags & ADP5520_FLAG_LED_MASK)
+                        led_dat->flags = cur_led->flags;
+                else
+                        led_dat->flags = i + 1;
+
+                led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK;
+
+                led_dat->master = pdev->dev.parent;
+                led_dat->new_brightness = LED_OFF;
+
+                INIT_WORK(&led_dat->work, adp5520_led_work);
+
+                ret = led_classdev_register(led_dat->master, &led_dat->cdev);
+                if (ret) {
+                        dev_err(&pdev->dev, "failed to register LED %d\n",
+                                led_dat->id);
+                        goto err;
+                }
+
+                ret = adp5520_led_setup(led_dat);
+                if (ret) {
+                        dev_err(&pdev->dev, "failed to write\n");
+                        i++;
+                        goto err;
+                }
+        }
+
+        platform_set_drvdata(pdev, led);
+        return 0;
+
+err:
+        if (i > 0) {
+                for (i = i - 1; i >= 0; i--) {
+                        led_classdev_unregister(&led[i].cdev);
+                        cancel_work_sync(&led[i].work);
+                }
+        }
+
+err_free:
+        kfree(led);
+        return ret;
+}
+
+static int __devexit adp5520_led_remove(struct platform_device *pdev)
+{
+        struct adp5520_leds_platform_data *pdata = pdev->dev.platform_data;
+        struct adp5520_led *led;
+        int i;
+
+        led = platform_get_drvdata(pdev);
+
+        adp5520_clr_bits(led->master, ADP5520_LED_CONTROL,
+                 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN);
+
+        for (i = 0; i < pdata->num_leds; i++) {
+                led_classdev_unregister(&led[i].cdev);
+                cancel_work_sync(&led[i].work);
+        }
+
+        kfree(led);
+        return 0;
+}
+
+static struct platform_driver adp5520_led_driver = {
+        .driver = {
+                .name   = "adp5520-led",
+                .owner  = THIS_MODULE,
+        },
+        .probe          = adp5520_led_probe,
+        .remove         = __devexit_p(adp5520_led_remove),
+};
+
+static int __init adp5520_led_init(void)
+{
+        return platform_driver_register(&adp5520_led_driver);
+}
+module_init(adp5520_led_init);
+
+static void __exit adp5520_led_exit(void)
+{
+        platform_driver_unregister(&adp5520_led_driver);
+}
+module_exit(adp5520_led_exit);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-led");