The MR18 uses a 3-channel 16-bit PWM Constant Current Driver for its status LED. Signed-off-by: Chris R Blake <chrisrblake93@gmail.com> SVN-Revision: 47848master
parent
eb8ff56684
commit
1dada3fc3c
@ -0,0 +1,396 @@ |
||||
/*
|
||||
* LED driver for NU801 |
||||
* |
||||
* Kevin Paul Herbert |
||||
* Copyright (c) 2012, Meraki, Inc. |
||||
* |
||||
* 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/slab.h> |
||||
#include <linux/platform_device.h> |
||||
#include <linux/leds.h> |
||||
#include <linux/workqueue.h> |
||||
#include <linux/delay.h> |
||||
#include <linux/leds-nu801.h> |
||||
|
||||
#include <asm/gpio.h> |
||||
#include <linux/of_gpio.h> |
||||
|
||||
#define MAX_NAME_LENGTH 24 |
||||
#define NUM_COLORS 3 |
||||
|
||||
static const char * const led_nu801_colors[] = { "blue", "green", "red" }; |
||||
|
||||
struct led_nu801_led_data { |
||||
struct led_classdev cdev; |
||||
struct led_nu801_data *controller; |
||||
enum led_brightness level; |
||||
char name[MAX_NAME_LENGTH]; |
||||
}; |
||||
|
||||
struct led_nu801_data { |
||||
unsigned cki; |
||||
unsigned sdi; |
||||
int lei; |
||||
struct delayed_work work; |
||||
struct led_nu801_led_data *led_chain; |
||||
int num_leds; |
||||
const char *device_name; |
||||
const char *name; |
||||
u32 ndelay; |
||||
atomic_t pending; |
||||
}; |
||||
|
||||
static void led_nu801_work(struct work_struct *work) |
||||
{ |
||||
struct led_nu801_data *controller = |
||||
container_of(work, struct led_nu801_data, work.work); |
||||
struct led_nu801_led_data *led; |
||||
u16 bit; |
||||
u16 brightness; |
||||
int index; |
||||
|
||||
for (index = 0; index < controller->num_leds; index++) { |
||||
led = &controller->led_chain[index]; |
||||
brightness = led->level << 8; /* To do: gamma correction */ |
||||
for (bit = 0x8000; bit; bit = bit >> 1) { |
||||
gpio_set_value(controller->sdi, |
||||
(brightness & bit) != 0); |
||||
gpio_set_value(controller->cki, 1); |
||||
if (unlikely(((index == (controller->num_leds - 1)) && |
||||
(bit == 1) && |
||||
(controller->lei < 0)))) { |
||||
udelay(600); |
||||
} else { |
||||
ndelay(controller->ndelay); |
||||
} |
||||
gpio_set_value(controller->cki, 0); |
||||
ndelay(controller->ndelay); |
||||
} |
||||
} |
||||
if (controller->lei >= 0) { |
||||
gpio_set_value(controller->lei, 1); |
||||
ndelay(controller->ndelay); |
||||
gpio_set_value(controller->lei, 0); |
||||
} |
||||
atomic_set(&controller->pending, 1); |
||||
} |
||||
|
||||
static void led_nu801_set(struct led_classdev *led_cdev, |
||||
enum led_brightness value) |
||||
{ |
||||
struct led_nu801_led_data *led_dat = |
||||
container_of(led_cdev, struct led_nu801_led_data, cdev); |
||||
struct led_nu801_data *controller = led_dat->controller; |
||||
|
||||
if (led_dat->level != value) { |
||||
led_dat->level = value; |
||||
if (atomic_dec_and_test(&controller->pending)) |
||||
schedule_delayed_work(&led_dat->controller->work, |
||||
(HZ/1000) + 1); |
||||
} |
||||
} |
||||
|
||||
static int __init led_nu801_create(struct led_nu801_data *controller, |
||||
struct device *parent, |
||||
int index, |
||||
enum led_brightness brightness, |
||||
#ifdef CONFIG_LEDS_TRIGGERS |
||||
const char *default_trigger, |
||||
#endif |
||||
const char *color) |
||||
{ |
||||
struct led_nu801_led_data *led = &controller->led_chain[index]; |
||||
int ret; |
||||
|
||||
scnprintf(led->name, sizeof(led->name), "%s:%s:%s%d", |
||||
controller->device_name, color, controller->name, |
||||
(controller->num_leds - (index + 1)) / NUM_COLORS); |
||||
led->cdev.name = led->name; |
||||
led->cdev.brightness_set = led_nu801_set; |
||||
#ifdef CONFIG_LEDS_TRIGGERS |
||||
led->cdev.default_trigger = default_trigger; |
||||
#endif |
||||
led->level = brightness; |
||||
led->controller = controller; |
||||
ret = led_classdev_register(parent, &led->cdev); |
||||
if (ret < 0) |
||||
goto err; |
||||
|
||||
return 0; |
||||
|
||||
err: |
||||
kfree(led); |
||||
return ret; |
||||
} |
||||
|
||||
static int __init |
||||
led_nu801_create_chain(const struct led_nu801_template *template, |
||||
struct led_nu801_data *controller, |
||||
struct device *parent) |
||||
{ |
||||
int ret; |
||||
int index; |
||||
|
||||
controller->cki = template->cki; |
||||
controller->sdi = template->sdi; |
||||
controller->lei = template->lei; |
||||
controller->num_leds = template->num_leds * 3; |
||||
controller->device_name = template->device_name; |
||||
controller->name = template->name; |
||||
controller->ndelay = template->ndelay; |
||||
atomic_set(&controller->pending, 1); |
||||
|
||||
controller->led_chain = kzalloc(sizeof(struct led_nu801_led_data) * |
||||
controller->num_leds, GFP_KERNEL); |
||||
|
||||
if (!controller->led_chain) |
||||
return -ENOMEM; |
||||
|
||||
ret = gpio_request(controller->cki, template->name); |
||||
if (ret < 0) |
||||
goto err_free_chain; |
||||
|
||||
ret = gpio_request(controller->sdi, template->name); |
||||
if (ret < 0) |
||||
goto err_ret_cki; |
||||
|
||||
if (controller->lei >= 0) { |
||||
ret = gpio_request(controller->lei, template->name); |
||||
if (ret < 0) |
||||
goto err_ret_sdi; |
||||
ret = gpio_direction_output(controller->lei, 0); |
||||
if (ret < 0) |
||||
goto err_ret_lei; |
||||
} |
||||
|
||||
ret = gpio_direction_output(controller->cki, 0); |
||||
if (ret < 0) |
||||
goto err_ret_lei; |
||||
|
||||
ret = gpio_direction_output(controller->sdi, 0); |
||||
if (ret < 0) |
||||
goto err_ret_lei; |
||||
|
||||
for (index = 0; index < controller->num_leds; index++) { |
||||
ret = led_nu801_create(controller, parent, index, |
||||
template->init_brightness |
||||
[index % NUM_COLORS], |
||||
#ifdef CONFIG_LEDS_TRIGGERS |
||||
template->default_trigger, |
||||
#endif |
||||
template->led_colors[index % NUM_COLORS] ? |
||||
template->led_colors[index % NUM_COLORS] : |
||||
led_nu801_colors[index % NUM_COLORS]); |
||||
if (ret < 0) |
||||
goto err_ret_sdi; |
||||
} |
||||
|
||||
INIT_DELAYED_WORK(&controller->work, led_nu801_work); |
||||
schedule_delayed_work(&controller->work, 0); |
||||
|
||||
return 0; |
||||
|
||||
err_ret_lei: |
||||
if (controller->lei >= 0) |
||||
gpio_free(controller->lei); |
||||
err_ret_sdi: |
||||
gpio_free(controller->sdi); |
||||
err_ret_cki: |
||||
gpio_free(controller->cki); |
||||
err_free_chain: |
||||
kfree(controller->led_chain); |
||||
|
||||
return ret; |
||||
} |
||||
|
||||
static void led_nu801_delete_chain(struct led_nu801_data *controller) |
||||
{ |
||||
struct led_nu801_led_data *led_chain; |
||||
struct led_nu801_led_data *led; |
||||
int index; |
||||
int num_leds; |
||||
|
||||
led_chain = controller->led_chain; |
||||
controller->led_chain = 0; |
||||
num_leds = controller->num_leds; |
||||
controller->num_leds = 0; |
||||
cancel_delayed_work_sync(&controller->work); |
||||
|
||||
for (index = 0; index < num_leds; index++) { |
||||
led = &led_chain[index]; |
||||
led_classdev_unregister(&led->cdev); |
||||
} |
||||
|
||||
gpio_free(controller->cki); |
||||
gpio_free(controller->sdi); |
||||
if (controller->lei >= 0) |
||||
gpio_free(controller->lei); |
||||
|
||||
kfree(led_chain); |
||||
} |
||||
|
||||
static struct led_nu801_data * __init |
||||
leds_nu801_create_of(struct platform_device *pdev) |
||||
{ |
||||
struct device_node *np = pdev->dev.of_node, *child; |
||||
struct led_nu801_data *controllers; |
||||
int count = 0, ret; |
||||
int i = 0; |
||||
|
||||
for_each_child_of_node(np, child) |
||||
count++; |
||||
if (!count) |
||||
return NULL; |
||||
|
||||
controllers = kzalloc(sizeof(struct led_nu801_data) * count, |
||||
GFP_KERNEL); |
||||
if (!controllers) |
||||
return NULL; |
||||
|
||||
for_each_child_of_node(np, child) { |
||||
const char *state; |
||||
struct led_nu801_template template = {}; |
||||
struct device_node *colors; |
||||
int jj; |
||||
|
||||
template.cki = of_get_named_gpio_flags(child, "cki", 0, NULL); |
||||
template.sdi = of_get_named_gpio_flags(child, "sdi", 0, NULL); |
||||
if (of_find_property(child, "lei", NULL)) { |
||||
template.lei = of_get_named_gpio_flags(child, "lei", |
||||
0, NULL); |
||||
} else { |
||||
template.lei = -1; |
||||
} |
||||
of_property_read_u32(child, "ndelay", &template.ndelay); |
||||
of_property_read_u32(child, "num_leds", &template.num_leds); |
||||
template.name = of_get_property(child, "label", NULL) ? : |
||||
child->name; |
||||
template.default_trigger = of_get_property(child, |
||||
"default-trigger", NULL); |
||||
|
||||
jj = 0; |
||||
for_each_child_of_node(child, colors) { |
||||
template.led_colors[jj] = of_get_property(colors, |
||||
"label", NULL); |
||||
state = of_get_property(colors, "state", NULL); |
||||
if (!strncmp(state, "off", 3)) |
||||
template.init_brightness[jj] = LED_OFF; |
||||
else if (!strncmp(state, "half", 4)) |
||||
template.init_brightness[jj] = LED_HALF; |
||||
else if (!strncmp(state, "full", 4)) |
||||
template.init_brightness[jj] = LED_FULL; |
||||
jj++; |
||||
} |
||||
|
||||
ret = led_nu801_create_chain(&template, |
||||
&controllers[i], |
||||
&pdev->dev); |
||||
if (ret < 0) |
||||
goto err; |
||||
i++; |
||||
} |
||||
|
||||
return controllers; |
||||
|
||||
err: |
||||
for (i = i - 1; i >= 0; i--) |
||||
led_nu801_delete_chain(&controllers[i]); |
||||
kfree(controllers); |
||||
return NULL; |
||||
} |
||||
|
||||
static int __init led_nu801_probe(struct platform_device *pdev) |
||||
{ |
||||
struct led_nu801_platform_data *pdata = pdev->dev.platform_data; |
||||
struct led_nu801_data *controllers; |
||||
int i, ret = 0; |
||||
|
||||
if (!(pdata && pdata->num_controllers)) { |
||||
controllers = leds_nu801_create_of(pdev); |
||||
if (!controllers) |
||||
return -ENODEV; |
||||
} |
||||
|
||||
controllers = kzalloc(sizeof(struct led_nu801_data) * |
||||
pdata->num_controllers, GFP_KERNEL); |
||||
if (!controllers) |
||||
return -ENOMEM; |
||||
|
||||
for (i = 0; i < pdata->num_controllers; i++) { |
||||
ret = led_nu801_create_chain(&pdata->template[i], |
||||
&controllers[i], |
||||
&pdev->dev); |
||||
if (ret < 0) |
||||
goto err; |
||||
} |
||||
|
||||
platform_set_drvdata(pdev, controllers); |
||||
|
||||
return 0; |
||||
|
||||
err: |
||||
for (i = i - 1; i >= 0; i--) |
||||
led_nu801_delete_chain(&controllers[i]); |
||||
|
||||
kfree(controllers); |
||||
|
||||
return ret; |
||||
} |
||||
|
||||
static int led_nu801_remove(struct platform_device *pdev) |
||||
{ |
||||
int i; |
||||
struct led_nu801_platform_data *pdata = pdev->dev.platform_data; |
||||
struct led_nu801_data *controllers; |
||||
|
||||
controllers = platform_get_drvdata(pdev); |
||||
|
||||
for (i = 0; i < pdata->num_controllers; i++) |
||||
led_nu801_delete_chain(&controllers[i]); |
||||
|
||||
kfree(controllers); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
static const struct of_device_id of_numen_leds_match[] = { |
||||
{ .compatible = "numen,leds-nu801", }, |
||||
{}, |
||||
}; |
||||
MODULE_DEVICE_TABLE(of, of_pwm_leds_match); |
||||
|
||||
static struct platform_driver led_nu801_driver = { |
||||
.probe = led_nu801_probe, |
||||
.remove = led_nu801_remove, |
||||
.driver = { |
||||
.name = "leds-nu801", |
||||
.owner = THIS_MODULE, |
||||
.of_match_table = of_numen_leds_match, |
||||
}, |
||||
}; |
||||
|
||||
static int __init led_nu801_init(void) |
||||
{ |
||||
return platform_driver_register(&led_nu801_driver); |
||||
} |
||||
|
||||
static void __exit led_nu801_exit(void) |
||||
{ |
||||
platform_driver_unregister(&led_nu801_driver); |
||||
} |
||||
|
||||
module_init(led_nu801_init); |
||||
module_exit(led_nu801_exit); |
||||
|
||||
MODULE_AUTHOR("Kevin Paul Herbert <kph@meraki.net>"); |
||||
MODULE_DESCRIPTION("NU801 LED driver"); |
||||
MODULE_LICENSE("GPL v2"); |
||||
MODULE_ALIAS("platform:leds-nu801"); |
@ -0,0 +1,38 @@ |
||||
#ifndef __LEDS_NU801_H__ |
||||
#define __LEDS_NU801_H__ |
||||
|
||||
/*
|
||||
* Definitions for LED driver for NU801 |
||||
* |
||||
* Kevin Paul Herbert |
||||
* Copyright (c) 2012, Meraki, Inc. |
||||
* |
||||
* 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/leds.h> |
||||
|
||||
struct led_nu801_template { |
||||
const char *device_name; /* Name of the platform device */ |
||||
const char *name; /* Name of this LED chain */ |
||||
int num_leds; /* Number of LEDs in the chain */ |
||||
unsigned cki; /* GPIO pin for CKI */ |
||||
unsigned sdi; /* GPIO pin for SDI */ |
||||
int lei; /* GPIO pin for LEI; < 0 if none */ |
||||
u32 ndelay; /* Delay in nanoseconds */ |
||||
enum led_brightness init_brightness[3]; /* Default rgb state */ |
||||
#ifdef CONFIG_LEDS_TRIGGERS |
||||
const char *default_trigger; /* default trigger */ |
||||
#endif |
||||
const char *led_colors[3]; /* rgb color order */ |
||||
}; |
||||
|
||||
struct led_nu801_platform_data { |
||||
int num_controllers; /* Numnber of controllers */ |
||||
struct led_nu801_template *template; /* Template per controller */ |
||||
}; |
||||
|
||||
#endif /* __LEDS_NU801_H__ */ |
@ -0,0 +1,26 @@ |
||||
--- a/drivers/leds/Kconfig
|
||||
+++ b/drivers/leds/Kconfig
|
||||
@@ -500,6 +500,13 @@ config LEDS_MENF21BMC
|
||||
|
||||
comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
|
||||
|
||||
+config LEDS_NU801
|
||||
+ tristate "LED driver for NU801 RGB LED"
|
||||
+ depends on LEDS_CLASS && ATH79_MACH_MR18
|
||||
+ help
|
||||
+ This option enables support for NU801 RGB LED driver chips
|
||||
+ accessed via GPIO.
|
||||
+
|
||||
config LEDS_BLINKM
|
||||
tristate "LED support for the BlinkM I2C RGB LED"
|
||||
depends on LEDS_CLASS
|
||||
--- a/drivers/leds/Makefile
|
||||
+++ b/drivers/leds/Makefile
|
||||
@@ -51,6 +51,7 @@ obj-$(CONFIG_LEDS_ADP5520) += leds-adp5
|
||||
obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell-led.o
|
||||
obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
|
||||
obj-$(CONFIG_LEDS_RB750) += leds-rb750.o
|
||||
+obj-$(CONFIG_LEDS_NU801) += leds-nu801.o
|
||||
obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
|
||||
obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
|
||||
obj-$(CONFIG_LEDS_ASIC3) += leds-asic3.o
|
Loading…
Reference in new issue