leds: Add mc13783 LED support

This add basic led support for Freescale MC13783 PMIC.

Signed-off-by: Philippe Rétornaz <philippe.retornaz@epfl.ch>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

5 files changed, 481 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index ecb6932c3636..f98d17a7108b 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -295,6 +295,13 @@ config LEDS_DELL_NETBOOKS
           This adds support for the Latitude 2100 and similar
           notebooks that have an external LED.
 
+config LEDS_MC13783
+        tristate "LED Support for MC13783 PMIC"
+        depends on MFD_MC13783
+        help
+          This option enable support for on-chip LED drivers found
+          on Freescale Semiconductor MC13783 PMIC.
+
 config LEDS_TRIGGERS
         bool "LED Trigger support"
         help
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 77119f2e26b3..2493de499374 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_LEDS_INTEL_SS4200)		+= leds-ss4200.o
 obj-$(CONFIG_LEDS_LT3593)               += leds-lt3593.o
 obj-$(CONFIG_LEDS_ADP5520)              += leds-adp5520.o
 obj-$(CONFIG_LEDS_DELL_NETBOOKS)        += dell-led.o
+obj-$(CONFIG_LEDS_MC13783)              += leds-mc13783.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)           += leds-dac124s085.o
diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c
new file mode 100644
index 000000000000..f05bb08d0f09
--- /dev/null
+++ b/drivers/leds/leds-mc13783.c
@@ -0,0 +1,403 @@
+/*
+ * LEDs driver for Freescale MC13783
+ *
+ * Copyright (C) 2010 Philippe Rétornaz
+ *
+ * Based on 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#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/mc13783.h>
+#include <linux/slab.h>
+
+struct mc13783_led {
+        struct led_classdev     cdev;
+        struct work_struct      work;
+        struct mc13783          *master;
+        enum led_brightness     new_brightness;
+        int                     id;
+};
+
+#define MC13783_REG_LED_CONTROL_0       51
+#define MC13783_LED_C0_ENABLE_BIT       (1 << 0)
+#define MC13783_LED_C0_TRIODE_MD_BIT    (1 << 7)
+#define MC13783_LED_C0_TRIODE_AD_BIT    (1 << 8)
+#define MC13783_LED_C0_TRIODE_KP_BIT    (1 << 9)
+#define MC13783_LED_C0_BOOST_BIT        (1 << 10)
+#define MC13783_LED_C0_ABMODE_MASK      0x7
+#define MC13783_LED_C0_ABMODE           11
+#define MC13783_LED_C0_ABREF_MASK       0x3
+#define MC13783_LED_C0_ABREF            14
+
+#define MC13783_REG_LED_CONTROL_1       52
+#define MC13783_LED_C1_TC1HALF_BIT      (1 << 18)
+
+#define MC13783_REG_LED_CONTROL_2       53
+#define MC13783_LED_C2_BL_P_MASK        0xf
+#define MC13783_LED_C2_MD_P             9
+#define MC13783_LED_C2_AD_P             13
+#define MC13783_LED_C2_KP_P             17
+#define MC13783_LED_C2_BL_C_MASK        0x7
+#define MC13783_LED_C2_MD_C             0
+#define MC13783_LED_C2_AD_C             3
+#define MC13783_LED_C2_KP_C             6
+
+#define MC13783_REG_LED_CONTROL_3       54
+#define MC13783_LED_C3_TC_P             6
+#define MC13783_LED_C3_TC_P_MASK        0x1f
+
+#define MC13783_REG_LED_CONTROL_4       55
+#define MC13783_REG_LED_CONTROL_5       56
+
+#define MC13783_LED_Cx_PERIOD           21
+#define MC13783_LED_Cx_PERIOD_MASK      0x3
+#define MC13783_LED_Cx_SLEWLIM_BIT      (1 << 23)
+#define MC13783_LED_Cx_TRIODE_TC_BIT    (1 << 23)
+#define MC13783_LED_Cx_TC_C_MASK        0x3
+
+static void mc13783_led_work(struct work_struct *work)
+{
+        struct mc13783_led *led = container_of(work, struct mc13783_led, work);
+        int reg = 0;
+        int mask = 0;
+        int value = 0;
+        int bank, off, shift;
+
+        switch (led->id) {
+        case MC13783_LED_MD:
+                reg = MC13783_REG_LED_CONTROL_2;
+                mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_MD_P;
+                value = (led->new_brightness >> 4) << MC13783_LED_C2_MD_P;
+                break;
+        case MC13783_LED_AD:
+                reg = MC13783_REG_LED_CONTROL_2;
+                mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_AD_P;
+                value = (led->new_brightness >> 4) << MC13783_LED_C2_AD_P;
+                break;
+        case MC13783_LED_KP:
+                reg = MC13783_REG_LED_CONTROL_2;
+                mask = MC13783_LED_C2_BL_P_MASK << MC13783_LED_C2_KP_P;
+                value = (led->new_brightness >> 4) << MC13783_LED_C2_KP_P;
+                break;
+        case MC13783_LED_R1:
+        case MC13783_LED_G1:
+        case MC13783_LED_B1:
+        case MC13783_LED_R2:
+        case MC13783_LED_G2:
+        case MC13783_LED_B2:
+        case MC13783_LED_R3:
+        case MC13783_LED_G3:
+        case MC13783_LED_B3:
+                off = led->id - MC13783_LED_R1;
+                bank = off/3;
+                reg = MC13783_REG_LED_CONTROL_3 + off/3;
+                shift = (off - bank * 3) * 5 + MC13783_LED_C3_TC_P;
+                value = (led->new_brightness >> 3) << shift;
+                mask = MC13783_LED_C3_TC_P_MASK << shift;
+                break;
+        }
+
+        mc13783_lock(led->master);
+
+        mc13783_reg_rmw(led->master, reg, mask, value);
+
+        mc13783_unlock(led->master);
+}
+
+static void mc13783_led_set(struct led_classdev *led_cdev,
+                           enum led_brightness value)
+{
+        struct mc13783_led *led;
+
+        led = container_of(led_cdev, struct mc13783_led, cdev);
+        led->new_brightness = value;
+        schedule_work(&led->work);
+}
+
+static int __devinit mc13783_led_setup(struct mc13783_led *led, int max_current)
+{
+        int shift = 0;
+        int mask = 0;
+        int value = 0;
+        int reg = 0;
+        int ret, bank;
+
+        switch (led->id) {
+        case MC13783_LED_MD:
+                shift = MC13783_LED_C2_MD_C;
+                mask = MC13783_LED_C2_BL_C_MASK;
+                value = max_current & MC13783_LED_C2_BL_C_MASK;
+                reg = MC13783_REG_LED_CONTROL_2;
+                break;
+        case MC13783_LED_AD:
+                shift = MC13783_LED_C2_AD_C;
+                mask = MC13783_LED_C2_BL_C_MASK;
+                value = max_current & MC13783_LED_C2_BL_C_MASK;
+                reg = MC13783_REG_LED_CONTROL_2;
+                break;
+        case MC13783_LED_KP:
+                shift = MC13783_LED_C2_KP_C;
+                mask = MC13783_LED_C2_BL_C_MASK;
+                value = max_current & MC13783_LED_C2_BL_C_MASK;
+                reg = MC13783_REG_LED_CONTROL_2;
+                break;