leds: add LM3533 LED driver
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@gmail.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Rob Landley <rob@landley.net> Cc: Samuel Ortiz <sameo@linux.intel.com> Cc: Jonathan Cameron <jic23@cam.ac.uk> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Bryan Wu <bryan.wu@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johan Hovold
Linus Torvalds
Родитель
e7e11d8ba8
Коммит
401dea7f7a
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@ -0,0 +1,65 @@
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What: /sys/class/leds/<led>/als_channel
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Date: May 2012
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KernelVersion: 3.5
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Contact: Johan Hovold <jhovold@gmail.com>
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Description:
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Set the ALS output channel to use as input in
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ALS-current-control mode (1, 2), where
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1 - out_current1
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2 - out_current2
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What: /sys/class/leds/<led>/als_en
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Date: May 2012
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KernelVersion: 3.5
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Contact: Johan Hovold <jhovold@gmail.com>
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Description:
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Enable ALS-current-control mode (0, 1).
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What: /sys/class/leds/<led>/falltime
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What: /sys/class/leds/<led>/risetime
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Date: April 2012
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KernelVersion: 3.5
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Contact: Johan Hovold <jhovold@gmail.com>
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Description:
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Set the pattern generator fall and rise times (0..7), where
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0 - 2048 us
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1 - 262 ms
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2 - 524 ms
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3 - 1.049 s
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4 - 2.097 s
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5 - 4.194 s
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6 - 8.389 s
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7 - 16.78 s
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What: /sys/class/leds/<led>/id
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Date: April 2012
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KernelVersion: 3.5
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Contact: Johan Hovold <jhovold@gmail.com>
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Description:
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Get the id of this led (0..3).
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What: /sys/class/leds/<led>/linear
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Date: April 2012
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KernelVersion: 3.5
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Contact: Johan Hovold <jhovold@gmail.com>
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Description:
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Set the brightness-mapping mode (0, 1), where
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0 - exponential mode
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1 - linear mode
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What: /sys/class/leds/<led>/pwm
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Date: April 2012
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KernelVersion: 3.5
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Contact: Johan Hovold <jhovold@gmail.com>
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Description:
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Set the PWM-input control mask (5 bits), where
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bit 5 - PWM-input enabled in Zone 4
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bit 4 - PWM-input enabled in Zone 3
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bit 3 - PWM-input enabled in Zone 2
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bit 2 - PWM-input enabled in Zone 1
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bit 1 - PWM-input enabled in Zone 0
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bit 0 - PWM-input enabled
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@ -50,6 +50,19 @@ config LEDS_LM3530
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controlled manually or using PWM input or using ambient
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light automatically.
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config LEDS_LM3533
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tristate "LED support for LM3533"
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depends on LEDS_CLASS
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depends on MFD_LM3533
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help
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This option enables support for the LEDs on National Semiconductor /
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TI LM3533 Lighting Power chips.
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The LEDs can be controlled directly, through PWM input, or by the
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ambient-light-sensor interface. The chip supports
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hardware-accelerated blinking with maximum on and off periods of 9.8
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and 77 seconds respectively.
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config LEDS_LOCOMO
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tristate "LED Support for Locomo device"
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depends on LEDS_CLASS
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@ -10,6 +10,7 @@ obj-$(CONFIG_LEDS_ATMEL_PWM) += leds-atmel-pwm.o
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obj-$(CONFIG_LEDS_BD2802) += leds-bd2802.o
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obj-$(CONFIG_LEDS_LOCOMO) += leds-locomo.o
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obj-$(CONFIG_LEDS_LM3530) += leds-lm3530.o
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obj-$(CONFIG_LEDS_LM3533) += leds-lm3533.o
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obj-$(CONFIG_LEDS_MIKROTIK_RB532) += leds-rb532.o
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obj-$(CONFIG_LEDS_S3C24XX) += leds-s3c24xx.o
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obj-$(CONFIG_LEDS_NET48XX) += leds-net48xx.o
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@ -0,0 +1,785 @@
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/*
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* leds-lm3533.c -- LM3533 LED driver
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*
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* Copyright (C) 2011-2012 Texas Instruments
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*
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* Author: Johan Hovold <jhovold@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/leds.h>
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#include <linux/mfd/core.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/lm3533.h>
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#define LM3533_LVCTRLBANK_MIN 2
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#define LM3533_LVCTRLBANK_MAX 5
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#define LM3533_LVCTRLBANK_COUNT 4
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#define LM3533_RISEFALLTIME_MAX 7
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#define LM3533_ALS_CHANNEL_LV_MIN 1
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#define LM3533_ALS_CHANNEL_LV_MAX 2
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#define LM3533_REG_CTRLBANK_BCONF_BASE 0x1b
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#define LM3533_REG_PATTERN_ENABLE 0x28
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#define LM3533_REG_PATTERN_LOW_TIME_BASE 0x71
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#define LM3533_REG_PATTERN_HIGH_TIME_BASE 0x72
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#define LM3533_REG_PATTERN_RISETIME_BASE 0x74
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#define LM3533_REG_PATTERN_FALLTIME_BASE 0x75
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#define LM3533_REG_PATTERN_STEP 0x10
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#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK 0x04
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#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK 0x02
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#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK 0x01
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#define LM3533_LED_FLAG_PATTERN_ENABLE 1
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struct lm3533_led {
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struct lm3533 *lm3533;
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struct lm3533_ctrlbank cb;
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struct led_classdev cdev;
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int id;
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struct mutex mutex;
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unsigned long flags;
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struct work_struct work;
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u8 new_brightness;
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};
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static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
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{
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return container_of(cdev, struct lm3533_led, cdev);
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}
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static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
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{
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return led->id + 2;
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}
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static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
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{
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return base + led->id;
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}
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static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
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{
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return led->id;
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}
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static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
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u8 base)
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{
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return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
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}
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static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
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{
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u8 mask;
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u8 val;
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int pattern;
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int state;
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int ret = 0;
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dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
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mutex_lock(&led->mutex);
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state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
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if ((enable && state) || (!enable && !state))
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goto out;
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pattern = lm3533_led_get_pattern(led);
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mask = 1 << (2 * pattern);
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if (enable)
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val = mask;
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else
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val = 0;
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ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
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if (ret) {
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dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
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pattern, enable);
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goto out;
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}
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__change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
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out:
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mutex_unlock(&led->mutex);
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return ret;
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}
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static void lm3533_led_work(struct work_struct *work)
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{
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struct lm3533_led *led = container_of(work, struct lm3533_led, work);
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dev_dbg(led->cdev.dev, "%s - %u\n", __func__, led->new_brightness);
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if (led->new_brightness == 0)
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lm3533_led_pattern_enable(led, 0); /* disable blink */
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lm3533_ctrlbank_set_brightness(&led->cb, led->new_brightness);
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}
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static void lm3533_led_set(struct led_classdev *cdev,
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enum led_brightness value)
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{
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struct lm3533_led *led = to_lm3533_led(cdev);
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dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
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led->new_brightness = value;
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schedule_work(&led->work);
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}
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static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
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{
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struct lm3533_led *led = to_lm3533_led(cdev);
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u8 val;
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int ret;
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ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
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if (ret)
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return ret;
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dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
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return val;
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}
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/* Pattern generator defines (delays in us). */
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#define LM3533_LED_DELAY1_VMIN 0x00
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#define LM3533_LED_DELAY2_VMIN 0x3d
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#define LM3533_LED_DELAY3_VMIN 0x80
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#define LM3533_LED_DELAY1_VMAX (LM3533_LED_DELAY2_VMIN - 1)
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#define LM3533_LED_DELAY2_VMAX (LM3533_LED_DELAY3_VMIN - 1)
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#define LM3533_LED_DELAY3_VMAX 0xff
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#define LM3533_LED_DELAY1_TMIN 16384U
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#define LM3533_LED_DELAY2_TMIN 1130496U
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#define LM3533_LED_DELAY3_TMIN 10305536U
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#define LM3533_LED_DELAY1_TMAX 999424U
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#define LM3533_LED_DELAY2_TMAX 9781248U
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#define LM3533_LED_DELAY3_TMAX 76890112U
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/* t_step = (t_max - t_min) / (v_max - v_min) */
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#define LM3533_LED_DELAY1_TSTEP 16384
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#define LM3533_LED_DELAY2_TSTEP 131072
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#define LM3533_LED_DELAY3_TSTEP 524288
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/* Delay limits for hardware accelerated blinking (in ms). */
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#define LM3533_LED_DELAY_ON_MAX \
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((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
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#define LM3533_LED_DELAY_OFF_MAX \
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((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
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/*
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* Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
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* size of t_step, where
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*
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* t_step = (t_max - t_min) / (v_max - v_min)
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*
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* and updates *t to reflect the mapped value.
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*/
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static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
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u8 v_min, u8 v_max)
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{
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unsigned val;
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val = (*t + t_step / 2 - t_min) / t_step + v_min;
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*t = t_step * (val - v_min) + t_min;
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return (u8)val;
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}
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/*
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* Returns time code corresponding to *delay (in ms) and updates *delay to
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* reflect actual hardware delay.
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*
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* Hardware supports 256 discrete delay times, divided into three groups with
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* the following ranges and step-sizes:
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*
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* [ 16, 999] [0x00, 0x3e] step 16 ms
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* [ 1130, 9781] [0x3d, 0x7f] step 131 ms
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* [10306, 76890] [0x80, 0xff] step 524 ms
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*
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* Note that delay group 3 is only available for delay_off.
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*/
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static u8 lm3533_led_get_hw_delay(unsigned *delay)
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{
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unsigned t;
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u8 val;
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t = *delay * 1000;
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if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
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t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
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val = time_to_val(&t, LM3533_LED_DELAY3_TMIN,
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LM3533_LED_DELAY3_TSTEP,
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LM3533_LED_DELAY3_VMIN,
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LM3533_LED_DELAY3_VMAX);
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} else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
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t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
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val = time_to_val(&t, LM3533_LED_DELAY2_TMIN,
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LM3533_LED_DELAY2_TSTEP,
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LM3533_LED_DELAY2_VMIN,
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LM3533_LED_DELAY2_VMAX);
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} else {
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t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
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val = time_to_val(&t, LM3533_LED_DELAY1_TMIN,
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LM3533_LED_DELAY1_TSTEP,
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LM3533_LED_DELAY1_VMIN,
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LM3533_LED_DELAY1_VMAX);
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}
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*delay = (t + 500) / 1000;
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return val;
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}
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/*
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* Set delay register base to *delay (in ms) and update *delay to reflect
|
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* actual hardware delay used.
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*/
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static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
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unsigned long *delay)
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{
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unsigned t;
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u8 val;
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u8 reg;
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int ret;
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t = (unsigned)*delay;
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/* Delay group 3 is only available for low time (delay off). */
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if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
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t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
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val = lm3533_led_get_hw_delay(&t);
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dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
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*delay, t, val);
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reg = lm3533_led_get_pattern_reg(led, base);
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ret = lm3533_write(led->lm3533, reg, val);
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if (ret)
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dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
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||||
|
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*delay = t;
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||||
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return ret;
|
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}
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|
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static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
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{
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return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
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}
|
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|
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static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
|
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{
|
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return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
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}
|
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|
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static int lm3533_led_blink_set(struct led_classdev *cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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struct lm3533_led *led = to_lm3533_led(cdev);
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int ret;
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|
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dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
|
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*delay_on, *delay_off);
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|
||||
if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
|
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*delay_off > LM3533_LED_DELAY_OFF_MAX)
|
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return -EINVAL;
|
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|
||||
if (*delay_on == 0 && *delay_off == 0) {
|
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*delay_on = 500;
|
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*delay_off = 500;
|
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}
|
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|
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ret = lm3533_led_delay_on_set(led, delay_on);
|
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if (ret)
|
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return ret;
|
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|
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ret = lm3533_led_delay_off_set(led, delay_off);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return lm3533_led_pattern_enable(led, 1);
|
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}
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
static ssize_t show_als_channel(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);
|
||||
unsigned channel;
|
||||
u8 reg;
|
||||
u8 val;
|
||||
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;
|
||||
|
||||
channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
|
||||
|
||||
return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
|
||||
}
|
||||
|
||||
static ssize_t store_als_channel(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 channel;
|
||||
u8 reg;
|
||||
u8 val;
|
||||
u8 mask;
|
||||
int ret;
|
||||
|
||||
if (kstrtouint(buf, 0, &channel))
|
||||
return -EINVAL;
|
||||
|
||||
if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
|
||||
channel > LM3533_ALS_CHANNEL_LV_MAX)
|
||||
return -EINVAL;
|
||||
|
||||
reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
|
||||
mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
|
||||
val = channel - 1;
|
||||
|
||||
ret = lm3533_update(led->lm3533, reg, val, mask);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
static ssize_t show_als_en(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);
|
||||
bool enable;
|
||||
u8 reg;
|
||||
u8 val;
|
||||
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;
|
||||
|
||||
enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
|
||||
|
||||
return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
|
||||
}
|
||||
|
||||
static ssize_t store_als_en(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 enable;
|
||||
u8 reg;
|
||||
u8 mask;
|
||||
u8 val;
|
||||
int ret;
|
||||
|
||||
if (kstrtouint(buf, 0, &enable))
|
||||
return -EINVAL;
|
||||
|
||||
reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
|
||||
mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
|
||||
|
||||
if (enable)
|
||||
val = mask;
|
||||
else
|
||||
val = 0;
|
||||
|
||||
ret = lm3533_update(led->lm3533, reg, val, 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_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_channel);
|
||||
static LM3533_ATTR_RW(als_en);
|
||||
static LM3533_ATTR_RW(falltime);
|
||||
static LM3533_ATTR_RO(id);
|
||||
static LM3533_ATTR_RW(linear);
|
||||
static LM3533_ATTR_RW(pwm);
|
||||
static LM3533_ATTR_RW(risetime);
|
||||
|
||||
static struct attribute *lm3533_led_attributes[] = {
|
||||
&dev_attr_als_channel.attr,
|
||||
&dev_attr_als_en.attr,
|
||||
&dev_attr_falltime.attr,
|
||||
&dev_attr_id.attr,
|
||||
&dev_attr_linear.attr,
|
||||
&dev_attr_pwm.attr,
|
||||
&dev_attr_risetime.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
static umode_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);
|
||||
umode_t mode = attr->mode;
|
||||
|
||||
if (attr == &dev_attr_als_channel.attr ||
|
||||
attr == &dev_attr_als_en.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 = devm_kzalloc(&pdev->dev, 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);
|
||||
return ret;
|
||||
}
|
||||
|
||||
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);
|
||||
|
||||
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);
|
||||
|
||||
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@gmail.com>");
|
||||
MODULE_DESCRIPTION("LM3533 LED driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS("platform:lm3533-leds");
|
||||
Загрузка…
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