[PATCH v2 3/4] leds: add LM3533 LED driver

From: Johan Hovold
Date: Thu May 03 2012 - 06:27:45 EST

Add sub-driver for the LEDs on National Semiconductor / TI LM3533
lighting power chips.

The chip provides 256 brightness levels, hardware accelerated blinking
as well as ambient-light-sensor and pwm input control.

Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
---

v2:
- add sysfs-ABI documentation
- open code max_current/pwm macros


.../ABI/testing/sysfs-class-led-driver-lm3533 | 67 ++
drivers/leds/Kconfig | 13 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-lm3533.c | 741 ++++++++++++++++++++
4 files changed, 822 insertions(+), 0 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-class-led-driver-lm3533
create mode 100644 drivers/leds/leds-lm3533.c

diff --git a/Documentation/ABI/testing/sysfs-class-led-driver-lm3533 b/Documentation/ABI/testing/sysfs-class-led-driver-lm3533
new file mode 100644
index 0000000..fc1ee04
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-led-driver-lm3533
@@ -0,0 +1,67 @@
+What: /sys/class/leds/<led>/als
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@xxxxxxxxx>
+Description:
+ Set the ALS-control mode (0, 2, 3), where
+
+ 0 - disabled
+ 2 - ALS-mapper 2
+ 3 - ALS-mapper 3
+
+What: /sys/class/leds/<led>/falltime
+What: /sys/class/leds/<led>/risetime
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@xxxxxxxxx>
+Description:
+ Set the pattern generator fall and rise times (0..7), where
+
+ 0 - 2048 us
+ 1 - 262 ms
+ 2 - 524 ms
+ 3 - 1.049 s
+ 4 - 2.097 s
+ 5 - 4.194 s
+ 6 - 8.389 s
+ 7 - 16.78 s
+
+What: /sys/class/leds/<led>/id
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@xxxxxxxxx>
+Description:
+ Get the id of this led (0..3).
+
+What: /sys/class/leds/<led>/linear
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@xxxxxxxxx>
+Description:
+ Set the brightness-mapping mode (0, 1), where
+
+ 0 - exponential mode
+ 1 - linear mode
+
+What: /sys/class/leds/<led>/max_current
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@xxxxxxxxx>
+Description:
+ Set the full-scale current I_{LED_FULLSCALE} (0..31), where
+
+ I_{LED_FULLSCALE} = 5mA + max_current * 0.8mA
+
+What: /sys/class/leds/<led>/pwm
+Date: April 2012
+KernelVersion: 3.5
+Contact: Johan Hovold <jhovold@xxxxxxxxx>
+Description:
+ Set the PWM-input control mask (5 bits), where
+
+ bit 5 - PWM-input enabled in Zone 4
+ bit 4 - PWM-input enabled in Zone 3
+ bit 3 - PWM-input enabled in Zone 2
+ bit 2 - PWM-input enabled in Zone 1
+ bit 1 - PWM-input enabled in Zone 0
+ bit 0 - PWM-input enabled
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index ff4b8cf..19bd829 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -50,6 +50,19 @@ config LEDS_LM3530
controlled manually or using PWM input or using ambient
light automatically.

+config LEDS_LM3533
+ tristate "LED support for LM3533"
+ depends on LEDS_CLASS
+ depends on MFD_LM3533
+ help
+ This option enables support for the LEDs on National Semiconductor /
+ TI LM3533 Lighting Power chips.
+
+ The LEDs can be controlled directly, through PWM input, or by the
+ ambient-light-sensor interface. The chip supports
+ hardware-accelerated blinking with maximum on and off periods of 9.8
+ and 77 seconds respectively.
+
config LEDS_LOCOMO
tristate "LED Support for Locomo device"
depends on LEDS_CLASS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 890481c..f39a526 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-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
diff --git a/drivers/leds/leds-lm3533.c b/drivers/leds/leds-lm3533.c
new file mode 100644
index 0000000..7d02f4b
--- /dev/null
+++ b/drivers/leds/leds-lm3533.c
@@ -0,0 +1,741 @@
+/*
+ * leds-lm3533.c -- LM3533 LED driver
+ *
+ * Copyright (C) 2011-2012 Texas Instruments
+ *
+ * Author: Johan Hovold <jhovold@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+#include <linux/mfd/core.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include <linux/mfd/lm3533.h>
+
+
+#define LM3533_LVCTRLBANK_MIN 2
+#define LM3533_LVCTRLBANK_MAX 5
+#define LM3533_LVCTRLBANK_COUNT 4
+#define LM3533_RISEFALLTIME_MAX 7
+#define LM3533_ALS_LV_MIN 2
+#define LM3533_ALS_LV_MAX 3
+
+#define LM3533_REG_CTRLBANK_BCONF_BASE 0x1b
+#define LM3533_REG_PATTERN_ENABLE 0x28
+#define LM3533_REG_PATTERN_LOW_TIME_BASE 0x71
+#define LM3533_REG_PATTERN_HIGH_TIME_BASE 0x72
+#define LM3533_REG_PATTERN_RISETIME_BASE 0x74
+#define LM3533_REG_PATTERN_FALLTIME_BASE 0x75
+
+#define LM3533_REG_PATTERN_STEP 0x10
+
+#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK 0x04
+#define LM3533_REG_CTRLBANK_BCONF_ALS_MASK 0x03
+
+#define LM3533_LED_FLAG_PATTERN_ENABLE 1
+
+
+struct lm3533_led {
+ struct lm3533 *lm3533;
+ struct lm3533_ctrlbank cb;
+ struct led_classdev cdev;
+ int id;
+
+ struct mutex mutex;
+ unsigned long flags;
+
+ struct work_struct work;
+ u8 new_brightness;
+};
+
+#define to_lm3533_led(_cdev) \
+ container_of(_cdev, struct lm3533_led, cdev)
+
+
+static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
+{
+ return led->id + 2;
+}
+
+static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
+{
+ return base + led->id;
+}
+
+static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
+{
+ return led->id;
+}
+
+static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
+ u8 base)
+{
+ return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
+}
+
+static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
+{
+ u8 mask;
+ u8 val;
+ int pattern;
+ int state;
+ int ret = 0;
+
+ dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
+
+ mutex_lock(&led->mutex);
+
+ state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
+ if ((enable && state) || (!enable && !state))
+ goto out;
+
+ pattern = lm3533_led_get_pattern(led);
+ mask = 1 << (2 * pattern);
+
+ if (enable)
+ val = mask;
+ else
+ val = 0;
+
+ ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
+ if (ret) {
+ dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
+ pattern, enable);
+ goto out;
+ }
+
+ __change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
+out:
+ mutex_unlock(&led->mutex);
+
+ return ret;
+}
+
+static void lm3533_led_work(struct work_struct *work)
+{
+ struct lm3533_led *led = container_of(work, struct lm3533_led, work);
+
+ dev_dbg(led->cdev.dev, "%s - %u\n", __func__, led->new_brightness);
+
+ if (led->new_brightness == 0)
+ lm3533_led_pattern_enable(led, 0); /* disable blink */
+
+ lm3533_ctrlbank_set_brightness(&led->cb, led->new_brightness);
+}
+
+static void lm3533_led_set(struct led_classdev *cdev,
+ enum led_brightness value)
+{
+ struct lm3533_led *led = to_lm3533_led(cdev);
+
+ dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
+
+ led->new_brightness = value;
+ schedule_work(&led->work);
+}
+
+static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
+{
+ struct lm3533_led *led = to_lm3533_led(cdev);
+ u8 val;
+ int ret;
+
+ ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
+ if (ret)
+ return ret;
+
+ dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
+
+ return val;
+}
+
+/* Pattern generator defines -- delays in us */
+#define LM3533_LED_DELAY_GROUP1_BASE 0x00
+#define LM3533_LED_DELAY_GROUP2_BASE 0x3d
+#define LM3533_LED_DELAY_GROUP3_BASE 0x80
+#define LM3533_LED_DELAY_MAX 0xff
+
+#define LM3533_LED_DELAY_GROUP1_STEP 16384
+#define LM3533_LED_DELAY_GROUP2_STEP 131072
+#define LM3533_LED_DELAY_GROUP3_STEP 524288
+#define LM3533_LED_DELAY_GROUP1_MIN 16384
+#define LM3533_LED_DELAY_GROUP2_MIN 1130496
+#define LM3533_LED_DELAY_GROUP3_MIN 10305536
+#define LM3533_LED_DELAY_GROUP1_MAX 999424
+#define LM3533_LED_DELAY_GROUP2_MAX 9781248
+#define LM3533_LED_DELAY_GROUP3_MAX 76890112
+
+/* Delay limits in ms */
+#define LM3533_LED_DELAY_ON_MAX 9845
+#define LM3533_LED_DELAY_OFF_MAX 77140
+
+static int time_to_val(long *t, long t_min, long t_max, long t_step,
+ int v_min, int v_max)
+{
+ int val;
+
+ *t += t_step / 2;
+ val = (*t - t_min) / t_step + v_min;
+ val = clamp(val, v_min, v_max);
+ *t = t_step * (val - v_min) + t_min;
+
+ return val;
+}
+
+static int lm3533_led_get_delay(long *delay)
+{
+ int val;
+
+ *delay *= 1000;
+
+ if (*delay >= LM3533_LED_DELAY_GROUP3_MIN -
+ LM3533_LED_DELAY_GROUP3_STEP / 2) {
+ val = time_to_val(delay, LM3533_LED_DELAY_GROUP3_MIN,
+ LM3533_LED_DELAY_GROUP3_MAX,
+ LM3533_LED_DELAY_GROUP3_STEP,
+ LM3533_LED_DELAY_GROUP3_BASE,
+ 0xff);
+ } else if (*delay >= LM3533_LED_DELAY_GROUP2_MIN -
+ LM3533_LED_DELAY_GROUP2_STEP / 2) {
+ val = time_to_val(delay, LM3533_LED_DELAY_GROUP2_MIN,
+ LM3533_LED_DELAY_GROUP2_MAX,
+ LM3533_LED_DELAY_GROUP2_STEP,
+ LM3533_LED_DELAY_GROUP2_BASE,
+ LM3533_LED_DELAY_GROUP3_BASE - 1);
+ } else {
+ val = time_to_val(delay, LM3533_LED_DELAY_GROUP1_MIN,
+ LM3533_LED_DELAY_GROUP1_MAX,
+ LM3533_LED_DELAY_GROUP1_STEP,
+ LM3533_LED_DELAY_GROUP1_BASE,
+ LM3533_LED_DELAY_GROUP2_BASE - 1);
+ }
+
+ *delay /= 1000;
+
+ return val;
+}
+
+static int lm3533_led_delay_set(struct lm3533_led *led, u8 base,
+ unsigned long *delay)
+{
+ u8 val;
+ u8 reg;
+ long t;
+ int ret;
+
+ t = *delay;
+ val = lm3533_led_get_delay(&t);
+
+ dev_dbg(led->cdev.dev, "%s - %lu: %ld (0x%02x)\n", __func__,
+ *delay, t, val);
+ reg = lm3533_led_get_pattern_reg(led, base);
+ ret = lm3533_write(led->lm3533, reg, val);
+ if (ret)
+ dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
+
+ *delay = t;
+
+ return ret;
+}
+
+static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
+{
+ *t = min_t(long, *t, LM3533_LED_DELAY_GROUP2_MAX / 1000);
+
+ return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
+}
+
+static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
+{
+ *t = min_t(long, *t, LM3533_LED_DELAY_GROUP3_MAX / 1000);
+
+ return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
+}
+
+static int lm3533_led_blink_set(struct led_classdev *cdev,
+ unsigned long *delay_on,
+ unsigned long *delay_off)
+{
+ struct lm3533_led *led = to_lm3533_led(cdev);
+ int ret;
+
+ dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
+ *delay_on, *delay_off);
+
+ if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
+ *delay_off > LM3533_LED_DELAY_OFF_MAX)
+ return -EINVAL;
+
+ if (*delay_on == 0 && *delay_off == 0) {
+ *delay_on = 500;
+ *delay_off = 500;
+ }
+
+ ret = lm3533_led_delay_on_set(led, delay_on);
+ if (ret)
+ return ret;
+
+ ret = lm3533_led_delay_off_set(led, delay_off);
+ if (ret)
+ return ret;
+
+ return lm3533_led_pattern_enable(led, 1);
+}
+
+static ssize_t show_id(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
+}
+
+/*
+ * Pattern generator rise/fall times:
+ *
+ * 0 - 2048 us (default)
+ * 1 - 262 ms
+ * 2 - 524 ms
+ * 3 - 1.049 s
+ * 4 - 2.097 s
+ * 5 - 4.194 s
+ * 6 - 8.389 s
+ * 7 - 16.78 s
+ */
+static ssize_t show_risefalltime(struct device *dev,
+ struct device_attribute *attr,
+ char *buf, u8 base)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ ssize_t ret;
+ u8 reg;
+ u8 val;
+
+ reg = lm3533_led_get_pattern_reg(led, base);
+ ret = lm3533_read(led->lm3533, reg, &val);
+ if (ret)
+ return ret;
+
+ return scnprintf(buf, PAGE_SIZE, "%x\n", val);
+}
+
+static ssize_t show_risetime(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return show_risefalltime(dev, attr, buf,
+ LM3533_REG_PATTERN_RISETIME_BASE);
+}
+
+static ssize_t show_falltime(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return show_risefalltime(dev, attr, buf,
+ LM3533_REG_PATTERN_FALLTIME_BASE);
+}
+
+static ssize_t store_risefalltime(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len, u8 base)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ u8 val;
+ u8 reg;
+ int ret;
+
+ if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
+ return -EINVAL;
+
+ reg = lm3533_led_get_pattern_reg(led, base);
+ ret = lm3533_write(led->lm3533, reg, val);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t store_risetime(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return store_risefalltime(dev, attr, buf, len,
+ LM3533_REG_PATTERN_RISETIME_BASE);
+}
+
+static ssize_t store_falltime(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ return store_risefalltime(dev, attr, buf, len,
+ LM3533_REG_PATTERN_FALLTIME_BASE);
+}
+
+/*
+ * ALS-control setting:
+ *
+ * 0 - ALS disabled
+ * 2 - ALS-mapper 2
+ * 3 - ALS-mapper 3
+ */
+static ssize_t show_als(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ u8 reg;
+ u8 val;
+ int als;
+ int ret;
+
+ reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+ ret = lm3533_read(led->lm3533, reg, &val);
+ if (ret)
+ return ret;
+
+ als = val & LM3533_REG_CTRLBANK_BCONF_ALS_MASK;
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", als);
+}
+
+static ssize_t store_als(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ u8 als;
+ u8 reg;
+ u8 mask;
+ int ret;
+
+ if (kstrtou8(buf, 0, &als))
+ return -EINVAL;
+
+ if (als != 0 && (als < LM3533_ALS_LV_MIN || als > LM3533_ALS_LV_MAX))
+ return -EINVAL;
+
+ reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+ mask = LM3533_REG_CTRLBANK_BCONF_ALS_MASK;
+
+ ret = lm3533_update(led->lm3533, reg, als, mask);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t show_linear(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ u8 reg;
+ u8 val;
+ int linear;
+ int ret;
+
+ reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+ ret = lm3533_read(led->lm3533, reg, &val);
+ if (ret)
+ return ret;
+
+ if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
+ linear = 1;
+ else
+ linear = 0;
+
+ return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
+}
+
+static ssize_t store_linear(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ unsigned long linear;
+ u8 reg;
+ u8 mask;
+ u8 val;
+ int ret;
+
+ if (kstrtoul(buf, 0, &linear))
+ return -EINVAL;
+
+ reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+ mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
+
+ if (linear)
+ val = mask;
+ else
+ val = 0;
+
+ ret = lm3533_update(led->lm3533, reg, val, mask);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t show_max_current(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ u8 val;
+ int ret;
+
+ ret = lm3533_ctrlbank_get_max_current(&led->cb, &val);
+ if (ret)
+ return ret;
+
+ return scnprintf(buf, PAGE_SIZE, "%u\n", val);
+}
+
+static ssize_t store_max_current(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ u8 val;
+ int ret;
+
+ if (kstrtou8(buf, 0, &val))
+ return -EINVAL;
+
+ ret = lm3533_ctrlbank_set_max_current(&led->cb, val);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t show_pwm(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ u8 val;
+ int ret;
+
+ ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
+ if (ret)
+ return ret;
+
+ return scnprintf(buf, PAGE_SIZE, "%u\n", val);
+}
+
+static ssize_t store_pwm(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ u8 val;
+ int ret;
+
+ if (kstrtou8(buf, 0, &val))
+ return -EINVAL;
+
+ ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static LM3533_ATTR_RW(als);
+static LM3533_ATTR_RW(falltime);
+static LM3533_ATTR_RO(id);
+static LM3533_ATTR_RW(linear);
+static LM3533_ATTR_RW(max_current);
+static LM3533_ATTR_RW(pwm);
+static LM3533_ATTR_RW(risetime);
+
+static struct attribute *lm3533_led_attributes[] = {
+ &dev_attr_als.attr,
+ &dev_attr_falltime.attr,
+ &dev_attr_id.attr,
+ &dev_attr_linear.attr,
+ &dev_attr_max_current.attr,
+ &dev_attr_pwm.attr,
+ &dev_attr_risetime.attr,
+ NULL,
+};
+
+static mode_t lm3533_led_attr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct device *dev = container_of(kobj, struct device, kobj);
+ struct led_classdev *led_cdev = dev_get_drvdata(dev);
+ struct lm3533_led *led = to_lm3533_led(led_cdev);
+ mode_t mode = attr->mode;
+
+ if (attr == &dev_attr_als.attr) {
+ if (!led->lm3533->have_als)
+ mode = 0;
+ }
+
+ return mode;
+};
+
+static struct attribute_group lm3533_led_attribute_group = {
+ .is_visible = lm3533_led_attr_is_visible,
+ .attrs = lm3533_led_attributes
+};
+
+static int __devinit lm3533_led_setup(struct lm3533_led *led,
+ struct lm3533_led_platform_data *pdata)
+{
+ int ret;
+
+ ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
+ if (ret)
+ return ret;
+
+ return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
+}
+
+static int __devinit lm3533_led_probe(struct platform_device *pdev)
+{
+ struct lm3533 *lm3533;
+ struct lm3533_led_platform_data *pdata;
+ struct lm3533_led *led;
+ int ret;
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ lm3533 = dev_get_drvdata(pdev->dev.parent);
+ if (!lm3533)
+ return -EINVAL;
+
+ pdata = pdev->dev.platform_data;
+ if (!pdata) {
+ dev_err(&pdev->dev, "no platform data\n");
+ return -EINVAL;
+ }
+
+ if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
+ dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
+ return -EINVAL;
+ }
+
+ led = kzalloc(sizeof(*led), GFP_KERNEL);
+ if (!led)
+ return -ENOMEM;
+
+ led->lm3533 = lm3533;
+ led->cdev.name = pdata->name;
+ led->cdev.default_trigger = pdata->default_trigger;
+ led->cdev.brightness_set = lm3533_led_set;
+ led->cdev.brightness_get = lm3533_led_get;
+ led->cdev.blink_set = lm3533_led_blink_set;
+ led->cdev.brightness = LED_OFF;
+ led->id = pdev->id;
+
+ mutex_init(&led->mutex);
+ INIT_WORK(&led->work, lm3533_led_work);
+
+ /* The class framework makes a callback to get brightness during
+ * registration so use parent device (for error reporting) until
+ * registered.
+ */
+ led->cb.lm3533 = lm3533;
+ led->cb.id = lm3533_led_get_ctrlbank_id(led);
+ led->cb.dev = lm3533->dev;
+
+ platform_set_drvdata(pdev, led);
+
+ ret = led_classdev_register(pdev->dev.parent, &led->cdev);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
+ goto err_free;
+ }
+
+ led->cb.dev = led->cdev.dev;
+
+ ret = sysfs_create_group(&led->cdev.dev->kobj,
+ &lm3533_led_attribute_group);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to create sysfs attributes\n");
+ goto err_unregister;
+ }
+
+ ret = lm3533_led_setup(led, pdata);
+ if (ret)
+ goto err_sysfs_remove;
+
+ ret = lm3533_ctrlbank_enable(&led->cb);
+ if (ret)
+ goto err_sysfs_remove;
+
+ return 0;
+
+err_sysfs_remove:
+ sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
+err_unregister:
+ led_classdev_unregister(&led->cdev);
+ flush_work_sync(&led->work);
+err_free:
+ kfree(led);
+
+ return ret;
+}
+
+static int __devexit lm3533_led_remove(struct platform_device *pdev)
+{
+ struct lm3533_led *led = platform_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ lm3533_ctrlbank_disable(&led->cb);
+ sysfs_remove_group(&led->cdev.dev->kobj, &lm3533_led_attribute_group);
+ led_classdev_unregister(&led->cdev);
+ flush_work_sync(&led->work);
+ kfree(led);
+
+ return 0;
+}
+
+static void lm3533_led_shutdown(struct platform_device *pdev)
+{
+
+ struct lm3533_led *led = platform_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ lm3533_ctrlbank_disable(&led->cb);
+ lm3533_led_set(&led->cdev, LED_OFF); /* disable blink */
+ flush_work_sync(&led->work);
+}
+
+static struct platform_driver lm3533_led_driver = {
+ .driver = {
+ .name = "lm3533-leds",
+ .owner = THIS_MODULE,
+ },
+ .probe = lm3533_led_probe,
+ .remove = __devexit_p(lm3533_led_remove),
+ .shutdown = lm3533_led_shutdown,
+};
+module_platform_driver(lm3533_led_driver);
+
+MODULE_AUTHOR("Johan Hovold <jhovold@xxxxxxxxx>");
+MODULE_DESCRIPTION("LM3533 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lm3533-leds");
--
1.7.8.5

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