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Subject[PATCH] leds: driver for ab5500 high voltage leds
Date
From: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>

Simple HV LED controller driver for AB5500v1.0 MFD chips

Signed-off-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Tested-by: Naga Radesh Y <naga.radheshy@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
This depends on the other movement patch since it handily puts the
platform data header in <linux/mfd/abx500/ab5500-leds.h>.
---
Documentation/ABI/testing/sysfs-class-led-ab5500 | 27 +
drivers/leds/Kconfig | 9 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-ab5500.c | 830 ++++++++++++++++++++++
include/linux/mfd/abx500/ab5500-leds.h | 54 ++
5 files changed, 921 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-class-led-ab5500
create mode 100644 drivers/leds/leds-ab5500.c
create mode 100644 include/linux/mfd/abx500/ab5500-leds.h
diff --git a/Documentation/ABI/testing/sysfs-class-led-ab5500 b/Documentation/ABI/testing/sysfs-class-led-ab5500
new file mode 100644
index 0000000..556b9c3
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-led-ab5500
@@ -0,0 +1,27 @@
+What: /sys/class/leds/<led>/fade_auto
+Date: December 2011
+KernelVersion: 3.3
+Contact: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
+Description:
+ Set the auto fadeout mode for the LED.
+ 0 = no auto fadeout
+ 1 = auto fadeout
+
+What: /sys/class/leds/<led>/fade_delay
+Date: December 2011
+KernelVersion: 3.3
+Contact: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
+Description:
+ Set the auto fadeout delay for the LED.
+ 0 = no delay
+ 1 = 1/2 second
+ 2 = 1 second
+ 3 = 2 seconds
+
+What: /sys/class/leds/<led>/led_current
+Date: December 2011
+KernelVersion: 3.3
+Contact: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
+Description:
+ Read and set the current limit for the LED. Value in
+ milliampere.
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index ff203a4..0114c68 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -50,6 +50,15 @@ config LEDS_LM3530
controlled manually or using PWM input or using ambient
light automatically.

+config LEDS_AB5500
+ tristate "HVLED driver for AB5500"
+ depends on AB5500_CORE
+ default n
+ help
+ This option enables support for the HVLED in AB5500
+ multi function device. Currently Ab5500 v1.0 chip leds
+ are supported.
+
config LEDS_LOCOMO
tristate "LED Support for Locomo device"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index e4f6bf5..614bad4 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_LEDS_ATMEL_PWM) += leds-atmel-pwm.o
obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
+obj-$(CONFIG_LEDS_AB5500) += leds-ab5500.o
obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
obj-$(CONFIG_LEDS_AMS_DELTA) += leds-ams-delta.o
diff --git a/drivers/leds/leds-ab5500.c b/drivers/leds/leds-ab5500.c
new file mode 100644
index 0000000..31c1e8c
--- /dev/null
+++ b/drivers/leds/leds-ab5500.c
@@ -0,0 +1,830 @@
+/*
+ * leds-ab5500.c - driver for High Voltage (HV) LED in ST-Ericsson AB5500 chip
+ *
+ * Copyright (C) 2011 ST-Ericsson SA.
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
+ */
+
+/*
+ * Driver for HVLED in ST-Ericsson AB5500 analog baseband controller
+ *
+ * This chip can drive upto 3 leds, of upto 40mA of led sink current.
+ * These leds can be programmed to blink between two intensities with
+ * fading delay of half, one or two seconds.
+ *
+ * Leds can be controlled via sysfs entries in
+ * "/sys/class/leds/< red | green | blue >"
+ *
+ * For each led,
+ *
+ * Modes of operation:
+ * - manual: echo 0 > fade_auto (default, no auto blinking)
+ * - auto: echo 1 > fade_auto
+ *
+ * Soft scaling delay between two intensities:
+ * - 1/2 sec: echo 1 > fade_delay
+ * - 1 sec: echo 2 > fade_delay
+ * - 2 sec: echo 3 > fade_delay
+ *
+ * Possible sequence of operation:
+ * - continuous glow: set brightness (brt)
+ * - blink between LED_OFF and LED_FULL:
+ * set fade delay -> set fade auto
+ * - blink between previous two brightness (only for LED-1):
+ * set brt1 -> set brt2 -> set fade auto
+ *
+ * Delay can be set in any step, its affect will be seen on switching mode.
+ *
+ * Note: Blink/Fade feature is supported in AB5500 v2 onwards
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/abx500/ab5500.h>
+#include <linux/mfd/abx500/ab5500-leds.h>
+#include <linux/types.h>
+
+#define AB5500LED_NAME "ab5500-leds"
+#define AB5500_LED_MAX 0x03
+
+/* Register offsets */
+#define AB5500_LED_REG_ENABLE 0x03
+#define AB5500_LED_FADE_CTRL 0x0D
+
+/* LED-0 Register Addr. Offsets */
+#define AB5500_LED0_PWM_DUTY 0x01
+#define AB5500_LED0_PWMFREQ 0x02
+#define AB5500_LED0_SINKCTL 0x0A
+#define AB5500_LED0_FADE_HI 0x11
+#define AB5500_LED0_FADE_LO 0x17
+
+/* LED-1 Register Addr. Offsets */
+#define AB5500_LED1_PWM_DUTY 0x05
+#define AB5500_LED1_PWMFREQ 0x06
+#define AB5500_LED1_SINKCTL 0x0B
+#define AB5500_LED1_FADE_HI 0x13
+#define AB5500_LED1_FADE_LO 0x19
+
+/* LED-2 Register Addr. Offsets */
+#define AB5500_LED2_PWM_DUTY 0x08
+#define AB5500_LED2_PWMFREQ 0x09
+#define AB5500_LED2_SINKCTL 0x0C
+#define AB5500_LED2_FADE_HI 0x15
+#define AB5500_LED2_FADE_LO 0x1B
+
+/* led-0/1/2 enable bit */
+#define AB5500_LED_ENABLE_MASK 0x04
+
+/* led intensity */
+#define AB5500_LED_INTENSITY_OFF 0x0
+#define AB5500_LED_INTENSITY_MAX 0x3FF
+#define AB5500_LED_INTENSITY_STEP (AB5500_LED_INTENSITY_MAX/LED_FULL)
+
+/* pwm frequency */
+#define AB5500_LED_PWMFREQ_MAX 0x0F /* 373.39 @sysclk=26MHz */
+#define AB5500_LED_PWMFREQ_SHIFT 4
+
+/* LED sink current control */
+#define AB5500_LED_SINKCURR_MAX 0x0F /* 40mA MAX */
+#define AB5500_LED_SINKCURR_SHIFT 4
+
+/* fade Control shift and masks */
+#define AB5500_FADE_DELAY_SHIFT 0x00
+#define AB5500_FADE_MODE_MASK 0x80
+#define AB5500_FADE_DELAY_MASK 0x03
+#define AB5500_FADE_START_MASK 0x04
+#define AB5500_FADE_ON_MASK 0x70
+#define AB5500_LED_FADE_ENABLE(ledid) (0x40 >> (ledid))
+
+/**
+ * struct ab5500_led
+ * @id: hvled index
+ * @max_current: max current permitted for hvled instance
+ * @brt_val: brightness value set for hvled
+ * @fade_hi: fadeout time high bits
+ * @fade_lo: fadeout time low bits
+ * @led_on: led is on
+ * @led_cdev: hvled class device
+ * @led_work: work to set the brightness of hvled
+ */
+struct ab5500_led {
+ u8 id;
+ u8 max_current;
+ u16 brt_val;
+ u16 fade_hi;
+ u16 fade_lo;
+ bool led_on;
+ struct led_classdev led_cdev;
+ struct work_struct led_work;
+};
+
+/**
+ * struct ab5500_hvleds
+ * @lock: lock to serialize access to hvleds
+ * @dev: device
+ * @pdata: platform data from board
+ * @leds: hvleds instances
+ * @hw_fade: this chip supports hardware fade
+ * @fade_auto: fade out leds automatically on this chip
+ * @fade_delay: fade out automatically after this delay time
+ */
+struct ab5500_hvleds {
+ struct mutex lock;
+ struct device *dev;
+ struct ab5500_hvleds_platform_data *pdata;
+ struct ab5500_led leds[AB5500_HVLEDS_MAX];
+ bool hw_fade;
+ bool fade_auto;
+ enum ab5500_fade_delay fade_delay;
+};
+
+static u8 ab5500_led_pwmduty_reg[AB5500_LED_MAX] = {
+ AB5500_LED0_PWM_DUTY,
+ AB5500_LED1_PWM_DUTY,
+ AB5500_LED2_PWM_DUTY,
+};
+
+static u8 ab5500_led_pwmfreq_reg[AB5500_LED_MAX] = {
+ AB5500_LED0_PWMFREQ,
+ AB5500_LED1_PWMFREQ,
+ AB5500_LED2_PWMFREQ,
+};
+
+static u8 ab5500_led_sinkctl_reg[AB5500_LED_MAX] = {
+ AB5500_LED0_SINKCTL,
+ AB5500_LED1_SINKCTL,
+ AB5500_LED2_SINKCTL
+};
+
+static u8 ab5500_led_fade_hi_reg[AB5500_LED_MAX] = {
+ AB5500_LED0_FADE_HI,
+ AB5500_LED1_FADE_HI,
+ AB5500_LED2_FADE_HI,
+};
+
+static u8 ab5500_led_fade_lo_reg[AB5500_LED_MAX] = {
+ AB5500_LED0_FADE_LO,
+ AB5500_LED1_FADE_LO,
+ AB5500_LED2_FADE_LO,
+};
+
+#define to_led(_x) container_of(_x, struct ab5500_led, _x)
+
+static inline struct ab5500_hvleds *led_to_hvleds(struct ab5500_led *led)
+{
+ return container_of(led, struct ab5500_hvleds, leds[led->id]);
+}
+
+static int ab5500_led_enable(struct ab5500_hvleds *hvleds,
+ unsigned int led_id)
+{
+ int ret;
+
+ ret = abx500_mask_and_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ ab5500_led_pwmduty_reg[led_id],
+ AB5500_LED_ENABLE_MASK,
+ AB5500_LED_ENABLE_MASK);
+ if (ret < 0)
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ ab5500_led_pwmduty_reg[led_id], ret);
+
+ return ret;
+
+}
+
+static int ab5500_led_start_manual(struct ab5500_hvleds *hvleds)
+{
+ int ret;
+
+ mutex_lock(&hvleds->lock);
+
+ ret = abx500_mask_and_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ AB5500_LED_FADE_CTRL, AB5500_FADE_START_MASK,
+ AB5500_FADE_START_MASK);
+ if (ret < 0)
+ dev_err(hvleds->dev, "update reg 0x%x failed - %d\n",
+ AB5500_LED_FADE_CTRL, ret);
+
+ mutex_unlock(&hvleds->lock);
+
+ return ret;
+}
+
+static int ab5500_led_disable(struct ab5500_hvleds *hvleds,
+ unsigned int led_id)
+{
+ int ret;
+
+ ret = abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ ab5500_led_pwmduty_reg[led_id] - 1, 0);
+ ret |= abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ ab5500_led_pwmduty_reg[led_id], 0);
+ if (ret < 0)
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ ab5500_led_pwmduty_reg[led_id], ret);
+
+ return ret;
+}
+
+static int ab5500_led_pwmduty_write(struct ab5500_hvleds *hvleds,
+ unsigned int led_id, u16 val)
+{
+ int ret;
+ u8 val_lsb = val & 0xFF;
+ u8 val_msb = (val & 0x300) >> 8;
+
+ mutex_lock(&hvleds->lock);
+
+ dev_dbg(hvleds->dev, "ab5500-leds: reg[%d] w val = %d\n"
+ "reg[%d] w val = %d\n",
+ ab5500_led_pwmduty_reg[led_id] - 1, val_lsb,
+ ab5500_led_pwmduty_reg[led_id], val_msb);
+
+ ret = abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ ab5500_led_pwmduty_reg[led_id] - 1, val_lsb);
+ ret |= abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ ab5500_led_pwmduty_reg[led_id], val_msb);
+ if (ret < 0)
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ ab5500_led_pwmduty_reg[led_id], ret);
+
+ mutex_unlock(&hvleds->lock);
+
+ return ret;
+}
+
+static int ab5500_led_pwmfreq_write(struct ab5500_hvleds *hvleds,
+ unsigned int led_id, u8 val)
+{
+ int ret;
+
+ val = (val & 0x0F) << AB5500_LED_PWMFREQ_SHIFT;
+
+ mutex_lock(&hvleds->lock);
+
+ dev_dbg(hvleds->dev, "ab5500-leds: reg[%d] w val=%d\n",
+ ab5500_led_pwmfreq_reg[led_id], val);
+
+ ret = abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ ab5500_led_pwmfreq_reg[led_id], val);
+ if (ret < 0)
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ ab5500_led_pwmfreq_reg[led_id], ret);
+
+ mutex_unlock(&hvleds->lock);
+
+ return ret;
+}
+
+static int ab5500_led_sinkctl_write(struct ab5500_hvleds *hvleds,
+ unsigned int led_id, u8 val)
+{
+ int ret;
+
+ if (val > AB5500_LED_SINKCURR_MAX)
+ val = AB5500_LED_SINKCURR_MAX;
+
+ val = (val << AB5500_LED_SINKCURR_SHIFT);
+
+ dev_dbg(hvleds->dev, "ab5500-leds: reg[%d] w val=%d\n",
+ ab5500_led_sinkctl_reg[led_id], val);
+
+ mutex_lock(&hvleds->lock);
+
+ ret = abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ ab5500_led_sinkctl_reg[led_id], val);
+ if (ret < 0)
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ ab5500_led_sinkctl_reg[led_id], ret);
+
+ mutex_unlock(&hvleds->lock);
+
+ return ret;
+}
+
+static int ab5500_led_fade_write(struct ab5500_hvleds *hvleds,
+ unsigned int led_id, bool on, u16 val)
+{
+ int ret;
+ int val_lsb = val & 0xFF;
+ int val_msb = (val & 0x300) >> 8;
+ u8 *fade_reg;
+
+ if (on)
+ fade_reg = ab5500_led_fade_hi_reg;
+ else
+ fade_reg = ab5500_led_fade_lo_reg;
+
+ dev_dbg(hvleds->dev, "ab5500-leds: reg[%d] w val = %d\n"
+ "reg[%d] w val = %d\n",
+ fade_reg[led_id] - 1, val_lsb,
+ fade_reg[led_id], val_msb);
+
+ mutex_lock(&hvleds->lock);
+
+ ret = abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ fade_reg[led_id] - 1, val_lsb);
+ ret |= abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ fade_reg[led_id], val_msb);
+ if (ret < 0)
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ fade_reg[led_id], ret);
+
+ mutex_unlock(&hvleds->lock);
+
+ return ret;
+}
+
+static int ab5500_led_sinkctl_read(struct ab5500_hvleds *hvleds,
+ unsigned int led_id)
+{
+ int ret;
+ u8 val;
+
+ mutex_lock(&hvleds->lock);
+
+ ret = abx500_get_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ ab5500_led_sinkctl_reg[led_id], &val);
+ if (ret < 0) {
+ dev_err(hvleds->dev, "reg[%d] r failed: %d\n",
+ ab5500_led_sinkctl_reg[led_id], ret);
+ mutex_unlock(&hvleds->lock);
+ return ret;
+ }
+
+ val = (val & 0xF0) >> AB5500_LED_SINKCURR_SHIFT;
+
+ mutex_unlock(&hvleds->lock);
+
+ return val;
+}
+
+static void ab5500_led_brightness_set(struct led_classdev *led_cdev,
+ enum led_brightness brt_val)
+{
+ struct ab5500_led *led = to_led(led_cdev);
+
+ /* adjust LED_FULL to 10bit range */
+ brt_val &= LED_FULL;
+ led->brt_val = brt_val * AB5500_LED_INTENSITY_STEP;
+
+ schedule_work(&led->led_work);
+}
+
+static void ab5500_led_work(struct work_struct *led_work)
+{
+ struct ab5500_led *led = to_led(led_work);
+ struct ab5500_hvleds *hvleds = led_to_hvleds(led);
+
+ if (led->led_on == true) {
+ ab5500_led_pwmduty_write(hvleds, led->id, led->brt_val);
+ if (hvleds->hw_fade && led->brt_val) {
+ ab5500_led_enable(hvleds, led->id);
+ ab5500_led_start_manual(hvleds);
+ }
+ }
+}
+
+static ssize_t ab5500_led_show_current(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int led_curr = 0;
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct ab5500_led *led = to_led(led_cdev);
+ struct ab5500_hvleds *hvleds = led_to_hvleds(led);
+
+ led_curr = ab5500_led_sinkctl_read(hvleds, led->id);
+
+ if (led_curr < 0)
+ return led_curr;
+
+ return sprintf(buf, "%d\n", led_curr);
+}
+
+static ssize_t ab5500_led_store_current(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ int ret;
+ unsigned long led_curr;
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct ab5500_led *led = to_led(led_cdev);
+ struct ab5500_hvleds *hvleds = led_to_hvleds(led);
+
+ if (strict_strtoul(buf, 0, &led_curr))
+ return -EINVAL;
+
+ if (led_curr > led->max_current)
+ led_curr = led->max_current;
+
+ ret = ab5500_led_sinkctl_write(hvleds, led->id, led_curr);
+ if (ret < 0)
+ return ret;
+
+ return len;
+}
+
+static ssize_t ab5500_led_store_fade_auto(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ int ret;
+ u8 fade_ctrl = 0;
+ unsigned long fade_auto;
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct ab5500_led *led = to_led(led_cdev);
+ struct ab5500_hvleds *hvleds = led_to_hvleds(led);
+
+ if (strict_strtoul(buf, 0, &fade_auto))
+ return -EINVAL;
+
+ if (fade_auto > 1) {
+ dev_err(hvleds->dev, "invalid mode\n");
+ return -EINVAL;
+ }
+
+ mutex_lock(&hvleds->lock);
+
+ ret = abx500_get_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ AB5500_LED_FADE_CTRL, &fade_ctrl);
+ if (ret < 0) {
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ AB5500_LED_FADE_CTRL, ret);
+ goto unlock_and_return;
+ }
+
+ /* manual mode */
+ if (fade_auto == false) {
+ fade_ctrl &= ~(AB5500_LED_FADE_ENABLE(led->id));
+ if (!(fade_ctrl & AB5500_FADE_ON_MASK))
+ fade_ctrl = 0;
+
+ ret = ab5500_led_disable(hvleds, led->id);
+ if (ret < 0)
+ goto unlock_and_return;
+ } else {
+ /* set led auto enable bit */
+ fade_ctrl |= AB5500_FADE_MODE_MASK;
+ fade_ctrl |= AB5500_LED_FADE_ENABLE(led->id);
+
+ /* set fade delay */
+ fade_ctrl &= ~AB5500_FADE_DELAY_MASK;
+ fade_ctrl |= hvleds->fade_delay << AB5500_FADE_DELAY_SHIFT;
+
+ /* set fade start manual */
+ fade_ctrl |= AB5500_FADE_START_MASK;
+
+ /* enble corresponding led */
+ ret = ab5500_led_enable(hvleds, led->id);
+ if (ret < 0)
+ goto unlock_and_return;
+
+ }
+
+ ret = abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ AB5500_LED_FADE_CTRL, fade_ctrl);
+ if (ret < 0) {
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ AB5500_LED_FADE_CTRL, ret);
+ goto unlock_and_return;
+ }
+
+ hvleds->fade_auto = fade_auto;
+
+ ret = len;
+
+unlock_and_return:
+ mutex_unlock(&hvleds->lock);
+
+ return ret;
+}
+
+static ssize_t ab5500_led_show_fade_auto(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct ab5500_led *led = to_led(led_cdev);
+ struct ab5500_hvleds *hvleds = led_to_hvleds(led);
+
+ return sprintf(buf, "%d\n", hvleds->fade_auto);
+}
+
+static ssize_t ab5500_led_store_fade_delay(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ unsigned long fade_delay;
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct ab5500_led *led = to_led(led_cdev);
+ struct ab5500_hvleds *hvleds = led_to_hvleds(led);
+
+ if (strict_strtoul(buf, 0, &fade_delay))
+ return -EINVAL;
+
+ if (fade_delay > AB5500_FADE_DELAY_TWOSEC) {
+ dev_err(hvleds->dev, "invalid mode\n");
+ return -EINVAL;
+ }
+
+ hvleds->fade_delay = fade_delay;
+
+ return len;
+}
+
+/* led class device attributes */
+static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO,
+ ab5500_led_show_current, ab5500_led_store_current);
+static DEVICE_ATTR(fade_auto, S_IRUGO | S_IWUGO,
+ ab5500_led_show_fade_auto, ab5500_led_store_fade_auto);
+static DEVICE_ATTR(fade_delay, S_IRUGO | S_IWUGO,
+ NULL, ab5500_led_store_fade_delay);
+
+static int ab5500_led_init_registers(struct ab5500_hvleds *hvleds)
+{
+ int ret = 0;
+ unsigned int led_id;
+
+ /* fade - manual : dur mid : pwm duty mid */
+ if (!hvleds->hw_fade) {
+ ret = abx500_set_register_interruptible(
+ hvleds->dev, AB5500_BANK_LED,
+ AB5500_LED_REG_ENABLE, true);
+ if (ret < 0) {
+ dev_err(hvleds->dev, "reg[%d] w failed: %d\n",
+ AB5500_LED_REG_ENABLE, ret);
+ return ret;
+ }
+ }
+
+ for (led_id = 0; led_id < AB5500_HVLEDS_MAX; led_id++) {
+ if (hvleds->leds[led_id].led_on == false)
+ continue;
+
+ ret = ab5500_led_sinkctl_write(
+ hvleds, led_id,
+ hvleds->leds[led_id].max_current);
+ if (ret < 0)
+ return ret;
+
+ if (hvleds->hw_fade) {
+ ret = ab5500_led_pwmfreq_write(
+ hvleds, led_id,
+ AB5500_LED_PWMFREQ_MAX / 2);
+ if (ret < 0)
+ return ret;
+
+ /* fade high intensity */
+ ret = ab5500_led_fade_write(
+ hvleds, led_id, true,
+ hvleds->leds[led_id].fade_hi);
+ if (ret < 0)
+ return ret;
+
+ /* fade low intensity */
+ ret = ab5500_led_fade_write(
+ hvleds, led_id, false,
+ hvleds->leds[led_id].fade_lo);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* init led off */
+ ret |= ab5500_led_pwmduty_write(
+ hvleds, led_id, AB5500_LED_INTENSITY_OFF);
+ if (ret < 0)
+ return ret;
+ }
+
+ return ret;
+}
+
+static int ab5500_led_register_leds(struct device *dev,
+ struct ab5500_hvleds_platform_data *pdata,
+ struct ab5500_hvleds *hvleds)
+{
+ int i_led;
+ int ret = 0;
+ struct ab5500_led_conf *pled;
+ struct ab5500_led *led;
+
+ hvleds->dev = dev;
+ hvleds->pdata = pdata;
+
+ if (abx500_get_chip_id(dev) == AB5500_2_0)
+ hvleds->hw_fade = true;
+ else
+ hvleds->hw_fade = false;
+
+ for (i_led = 0; i_led < AB5500_HVLEDS_MAX; i_led++) {
+ pled = &pdata->leds[i_led];
+ led = &hvleds->leds[i_led];
+
+ INIT_WORK(&led->led_work, ab5500_led_work);
+
+ led->id = pled->led_id;
+ led->max_current = pled->max_current;
+ led->led_on = pled->led_on;
+ led->led_cdev.name = pled->name;
+ led->led_cdev.brightness_set = ab5500_led_brightness_set;
+
+ /* Provide interface only for enabled LEDs */
+ if (led->led_on == false)
+ continue;
+
+ if (hvleds->hw_fade) {
+ led->fade_hi = (pled->fade_hi & LED_FULL);
+ led->fade_hi *= AB5500_LED_INTENSITY_STEP;
+ led->fade_lo = (pled->fade_lo & LED_FULL);
+ led->fade_lo *= AB5500_LED_INTENSITY_STEP;
+ }
+
+ ret = led_classdev_register(dev, &led->led_cdev);
+ if (ret < 0) {
+ dev_err(dev, "Register led class failed: %d\n", ret);
+ goto bailout1;
+ }
+
+ ret = device_create_file(led->led_cdev.dev,
+ &dev_attr_led_current);
+ if (ret < 0) {
+ dev_err(dev, "sysfs device creation failed: %d\n", ret);
+ goto bailout2;
+ }
+
+ if (hvleds->hw_fade) {
+ ret = device_create_file(led->led_cdev.dev,
+ &dev_attr_fade_auto);
+ if (ret < 0) {
+ dev_err(dev, "sysfs device "
+ "creation failed: %d\n", ret);
+ goto bailout3;
+ }
+
+ ret = device_create_file(led->led_cdev.dev,
+ &dev_attr_fade_delay);
+ if (ret < 0) {
+ dev_err(dev, "sysfs device "
+ "creation failed: %d\n", ret);
+ goto bailout4;
+ }
+ }
+ }
+
+ return ret;
+ for (; i_led >= 0; i_led--) {
+ if (hvleds->leds[i_led].led_on == false)
+ continue;
+
+ if (hvleds->hw_fade) {
+ device_remove_file(hvleds->leds[i_led].led_cdev.dev,
+ &dev_attr_fade_delay);
+bailout4:
+ device_remove_file(hvleds->leds[i_led].led_cdev.dev,
+ &dev_attr_fade_auto);
+ }
+bailout3:
+ device_remove_file(hvleds->leds[i_led].led_cdev.dev,
+ &dev_attr_led_current);
+bailout2:
+ led_classdev_unregister(&hvleds->leds[i_led].led_cdev);
+bailout1:
+ cancel_work_sync(&hvleds->leds[i_led].led_work);
+ }
+ return ret;
+}
+
+static int __devinit ab5500_hvleds_probe(struct platform_device *pdev)
+{
+ struct ab5500_hvleds_platform_data *pdata = pdev->dev.platform_data;
+ struct ab5500_hvleds *hvleds = NULL;
+ int ret = 0, i;
+
+ if (pdata == NULL) {
+ dev_err(&pdev->dev, "platform data required\n");
+ ret = -ENODEV;
+ goto err_out;
+ }
+
+ hvleds = kzalloc(sizeof(struct ab5500_hvleds), GFP_KERNEL);
+ if (hvleds == NULL) {
+ ret = -ENOMEM;
+ goto err_out;
+ }
+
+ mutex_init(&hvleds->lock);
+
+ /* init leds data and register led_classdev */
+ ret = ab5500_led_register_leds(&pdev->dev, pdata, hvleds);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "leds registration failed\n");
+ goto err_out;
+ }
+
+ /* init device registers and set initial led current */
+ ret = ab5500_led_init_registers(hvleds);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "reg init failed: %d\n", ret);
+ goto err_reg_init;
+ }
+
+ if (hvleds->hw_fade)
+ dev_info(&pdev->dev, "v2 enabled\n");
+ else
+ dev_info(&pdev->dev, "v1 enabled\n");
+
+ return ret;
+
+err_reg_init:
+ for (i = 0; i < AB5500_HVLEDS_MAX; i++) {
+ struct ab5500_led *led = &hvleds->leds[i];
+
+ if (led->led_on == false)
+ continue;
+
+ device_remove_file(led->led_cdev.dev, &dev_attr_led_current);
+ if (hvleds->hw_fade) {
+ device_remove_file(led->led_cdev.dev,
+ &dev_attr_fade_auto);
+ device_remove_file(led->led_cdev.dev,
+ &dev_attr_fade_delay);
+ }
+ led_classdev_unregister(&led->led_cdev);
+ cancel_work_sync(&led->led_work);
+ }
+err_out:
+ kfree(hvleds);
+ return ret;
+}
+
+static int __devexit ab5500_hvleds_remove(struct platform_device *pdev)
+{
+ struct ab5500_hvleds *hvleds = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < AB5500_HVLEDS_MAX; i++) {
+ struct ab5500_led *led = &hvleds->leds[i];
+
+ if (led->led_on == false)
+ continue;
+
+ device_remove_file(led->led_cdev.dev, &dev_attr_led_current);
+ if (hvleds->hw_fade) {
+ device_remove_file(led->led_cdev.dev,
+ &dev_attr_fade_auto);
+ device_remove_file(led->led_cdev.dev,
+ &dev_attr_fade_delay);
+ }
+ led_classdev_unregister(&led->led_cdev);
+ cancel_work_sync(&led->led_work);
+ }
+ kfree(hvleds);
+ return 0;
+}
+
+static struct platform_driver ab5500_hvleds_driver = {
+ .driver = {
+ .name = AB5500LED_NAME,
+ .owner = THIS_MODULE,
+ },
+ .probe = ab5500_hvleds_probe,
+ .remove = __devexit_p(ab5500_hvleds_remove),
+};
+
+static int __init ab5500_hvleds_module_init(void)
+{
+ return platform_driver_register(&ab5500_hvleds_driver);
+}
+
+static void __exit ab5500_hvleds_module_exit(void)
+{
+ platform_driver_unregister(&ab5500_hvleds_driver);
+}
+
+module_init(ab5500_hvleds_module_init);
+module_exit(ab5500_hvleds_module_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>");
+MODULE_DESCRIPTION("Driver for AB5500 HVLED");
diff --git a/include/linux/mfd/abx500/ab5500-leds.h b/include/linux/mfd/abx500/ab5500-leds.h
new file mode 100644
index 0000000..54ba53a
--- /dev/null
+++ b/include/linux/mfd/abx500/ab5500-leds.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2011 ST-Ericsson SA.
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Simple driver for HVLED in ST-Ericsson AB5500 Analog baseband Controller
+ *
+ * Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
+ */
+
+#ifndef _LINUX_LEDS_AB5500_H__
+#define _LINUX_LEDS_AB5500_H__
+
+#define AB5500_HVLED0 0
+#define AB5500_HVLED1 1
+#define AB5500_HVLED2 2
+#define AB5500_HVLEDS_MAX 3
+
+enum ab5500_fade_delay {
+ AB5500_FADE_DELAY_BYPASS = 0,
+ AB5500_FADE_DELAY_HALFSEC,
+ AB5500_FADE_DELAY_ONESEC,
+ AB5500_FADE_DELAY_TWOSEC
+};
+
+/**
+ * struct ab5500_led_conf
+ * @name: hvled instance name
+ * @led_id: hvled index
+ * @max_current: max current permitted for hvled instance
+ * @fade_hi: fadeout time high bits
+ * @fade_lo: fadeout time low bits
+ * @led_on: led is on by default
+ */
+struct ab5500_led_conf {
+ char *name;
+ u8 led_id;
+ u8 max_current;
+ u8 fade_hi;
+ u8 fade_lo;
+ bool led_on;
+};
+
+/**
+ * struct ab5500_hvleds_platform_data
+ * @hw_fade: fadeout feature present in hardware
+ * @leds: hvleds instances
+ */
+struct ab5500_hvleds_platform_data {
+ bool hw_fade;
+ struct ab5500_led_conf leds[AB5500_HVLEDS_MAX];
+};
+
+#endif /* _LINUX_LEDS_AB5500_H__ */
--
1.7.3.2


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