ar71xx: add LED driver NU801
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: 47848
This commit is contained in:
John Crispin
parent
eb8ff56684
commit
1dada3fc3c
396
target/linux/ar71xx/files/drivers/leds/leds-nu801.c
Normal file
396
target/linux/ar71xx/files/drivers/leds/leds-nu801.c
Normal file
@ -0,0 +1,396 @@
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/*
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* LED driver for NU801
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*
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* Kevin Paul Herbert
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* Copyright (c) 2012, Meraki, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/leds-nu801.h>
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#include <asm/gpio.h>
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#include <linux/of_gpio.h>
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#define MAX_NAME_LENGTH 24
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#define NUM_COLORS 3
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static const char * const led_nu801_colors[] = { "blue", "green", "red" };
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struct led_nu801_led_data {
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struct led_classdev cdev;
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struct led_nu801_data *controller;
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enum led_brightness level;
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char name[MAX_NAME_LENGTH];
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};
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struct led_nu801_data {
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unsigned cki;
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unsigned sdi;
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int lei;
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struct delayed_work work;
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struct led_nu801_led_data *led_chain;
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int num_leds;
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const char *device_name;
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const char *name;
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u32 ndelay;
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atomic_t pending;
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};
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static void led_nu801_work(struct work_struct *work)
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{
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struct led_nu801_data *controller =
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container_of(work, struct led_nu801_data, work.work);
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struct led_nu801_led_data *led;
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u16 bit;
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u16 brightness;
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int index;
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for (index = 0; index < controller->num_leds; index++) {
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led = &controller->led_chain[index];
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brightness = led->level << 8; /* To do: gamma correction */
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for (bit = 0x8000; bit; bit = bit >> 1) {
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gpio_set_value(controller->sdi,
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(brightness & bit) != 0);
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gpio_set_value(controller->cki, 1);
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if (unlikely(((index == (controller->num_leds - 1)) &&
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(bit == 1) &&
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(controller->lei < 0)))) {
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udelay(600);
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} else {
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ndelay(controller->ndelay);
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}
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gpio_set_value(controller->cki, 0);
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ndelay(controller->ndelay);
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}
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}
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if (controller->lei >= 0) {
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gpio_set_value(controller->lei, 1);
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ndelay(controller->ndelay);
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gpio_set_value(controller->lei, 0);
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}
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atomic_set(&controller->pending, 1);
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}
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static void led_nu801_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct led_nu801_led_data *led_dat =
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container_of(led_cdev, struct led_nu801_led_data, cdev);
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struct led_nu801_data *controller = led_dat->controller;
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if (led_dat->level != value) {
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led_dat->level = value;
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if (atomic_dec_and_test(&controller->pending))
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schedule_delayed_work(&led_dat->controller->work,
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(HZ/1000) + 1);
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}
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}
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static int __init led_nu801_create(struct led_nu801_data *controller,
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struct device *parent,
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int index,
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enum led_brightness brightness,
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#ifdef CONFIG_LEDS_TRIGGERS
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const char *default_trigger,
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#endif
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const char *color)
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{
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struct led_nu801_led_data *led = &controller->led_chain[index];
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int ret;
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scnprintf(led->name, sizeof(led->name), "%s:%s:%s%d",
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controller->device_name, color, controller->name,
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(controller->num_leds - (index + 1)) / NUM_COLORS);
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led->cdev.name = led->name;
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led->cdev.brightness_set = led_nu801_set;
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#ifdef CONFIG_LEDS_TRIGGERS
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led->cdev.default_trigger = default_trigger;
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#endif
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led->level = brightness;
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led->controller = controller;
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ret = led_classdev_register(parent, &led->cdev);
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if (ret < 0)
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goto err;
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return 0;
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err:
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kfree(led);
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return ret;
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}
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static int __init
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led_nu801_create_chain(const struct led_nu801_template *template,
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struct led_nu801_data *controller,
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struct device *parent)
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{
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int ret;
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int index;
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controller->cki = template->cki;
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controller->sdi = template->sdi;
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controller->lei = template->lei;
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controller->num_leds = template->num_leds * 3;
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controller->device_name = template->device_name;
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controller->name = template->name;
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controller->ndelay = template->ndelay;
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atomic_set(&controller->pending, 1);
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controller->led_chain = kzalloc(sizeof(struct led_nu801_led_data) *
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controller->num_leds, GFP_KERNEL);
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if (!controller->led_chain)
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return -ENOMEM;
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ret = gpio_request(controller->cki, template->name);
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if (ret < 0)
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goto err_free_chain;
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ret = gpio_request(controller->sdi, template->name);
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if (ret < 0)
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goto err_ret_cki;
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if (controller->lei >= 0) {
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ret = gpio_request(controller->lei, template->name);
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if (ret < 0)
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goto err_ret_sdi;
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ret = gpio_direction_output(controller->lei, 0);
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if (ret < 0)
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goto err_ret_lei;
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}
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ret = gpio_direction_output(controller->cki, 0);
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if (ret < 0)
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goto err_ret_lei;
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ret = gpio_direction_output(controller->sdi, 0);
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if (ret < 0)
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goto err_ret_lei;
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for (index = 0; index < controller->num_leds; index++) {
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ret = led_nu801_create(controller, parent, index,
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template->init_brightness
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[index % NUM_COLORS],
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#ifdef CONFIG_LEDS_TRIGGERS
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template->default_trigger,
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#endif
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template->led_colors[index % NUM_COLORS] ?
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template->led_colors[index % NUM_COLORS] :
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led_nu801_colors[index % NUM_COLORS]);
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if (ret < 0)
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goto err_ret_sdi;
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}
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INIT_DELAYED_WORK(&controller->work, led_nu801_work);
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schedule_delayed_work(&controller->work, 0);
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return 0;
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err_ret_lei:
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if (controller->lei >= 0)
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gpio_free(controller->lei);
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err_ret_sdi:
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gpio_free(controller->sdi);
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err_ret_cki:
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gpio_free(controller->cki);
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err_free_chain:
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kfree(controller->led_chain);
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return ret;
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}
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static void led_nu801_delete_chain(struct led_nu801_data *controller)
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{
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struct led_nu801_led_data *led_chain;
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struct led_nu801_led_data *led;
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int index;
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int num_leds;
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led_chain = controller->led_chain;
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controller->led_chain = 0;
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num_leds = controller->num_leds;
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controller->num_leds = 0;
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cancel_delayed_work_sync(&controller->work);
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for (index = 0; index < num_leds; index++) {
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led = &led_chain[index];
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led_classdev_unregister(&led->cdev);
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}
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gpio_free(controller->cki);
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gpio_free(controller->sdi);
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if (controller->lei >= 0)
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gpio_free(controller->lei);
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kfree(led_chain);
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}
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static struct led_nu801_data * __init
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leds_nu801_create_of(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node, *child;
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struct led_nu801_data *controllers;
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int count = 0, ret;
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int i = 0;
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for_each_child_of_node(np, child)
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count++;
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if (!count)
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return NULL;
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controllers = kzalloc(sizeof(struct led_nu801_data) * count,
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GFP_KERNEL);
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if (!controllers)
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return NULL;
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for_each_child_of_node(np, child) {
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const char *state;
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struct led_nu801_template template = {};
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struct device_node *colors;
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int jj;
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template.cki = of_get_named_gpio_flags(child, "cki", 0, NULL);
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template.sdi = of_get_named_gpio_flags(child, "sdi", 0, NULL);
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if (of_find_property(child, "lei", NULL)) {
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template.lei = of_get_named_gpio_flags(child, "lei",
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0, NULL);
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} else {
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template.lei = -1;
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}
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of_property_read_u32(child, "ndelay", &template.ndelay);
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of_property_read_u32(child, "num_leds", &template.num_leds);
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template.name = of_get_property(child, "label", NULL) ? :
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child->name;
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template.default_trigger = of_get_property(child,
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"default-trigger", NULL);
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jj = 0;
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for_each_child_of_node(child, colors) {
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template.led_colors[jj] = of_get_property(colors,
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"label", NULL);
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state = of_get_property(colors, "state", NULL);
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if (!strncmp(state, "off", 3))
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template.init_brightness[jj] = LED_OFF;
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else if (!strncmp(state, "half", 4))
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template.init_brightness[jj] = LED_HALF;
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else if (!strncmp(state, "full", 4))
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template.init_brightness[jj] = LED_FULL;
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jj++;
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}
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ret = led_nu801_create_chain(&template,
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&controllers[i],
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&pdev->dev);
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if (ret < 0)
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goto err;
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i++;
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}
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return controllers;
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err:
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for (i = i - 1; i >= 0; i--)
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led_nu801_delete_chain(&controllers[i]);
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kfree(controllers);
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return NULL;
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}
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static int __init led_nu801_probe(struct platform_device *pdev)
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{
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struct led_nu801_platform_data *pdata = pdev->dev.platform_data;
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struct led_nu801_data *controllers;
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int i, ret = 0;
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if (!(pdata && pdata->num_controllers)) {
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controllers = leds_nu801_create_of(pdev);
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if (!controllers)
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return -ENODEV;
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}
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controllers = kzalloc(sizeof(struct led_nu801_data) *
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pdata->num_controllers, GFP_KERNEL);
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if (!controllers)
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return -ENOMEM;
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for (i = 0; i < pdata->num_controllers; i++) {
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ret = led_nu801_create_chain(&pdata->template[i],
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&controllers[i],
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&pdev->dev);
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if (ret < 0)
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goto err;
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}
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platform_set_drvdata(pdev, controllers);
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return 0;
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err:
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for (i = i - 1; i >= 0; i--)
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led_nu801_delete_chain(&controllers[i]);
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kfree(controllers);
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return ret;
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}
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static int led_nu801_remove(struct platform_device *pdev)
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{
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int i;
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struct led_nu801_platform_data *pdata = pdev->dev.platform_data;
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struct led_nu801_data *controllers;
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controllers = platform_get_drvdata(pdev);
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for (i = 0; i < pdata->num_controllers; i++)
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led_nu801_delete_chain(&controllers[i]);
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kfree(controllers);
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return 0;
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}
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static const struct of_device_id of_numen_leds_match[] = {
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{ .compatible = "numen,leds-nu801", },
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{},
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};
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MODULE_DEVICE_TABLE(of, of_pwm_leds_match);
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static struct platform_driver led_nu801_driver = {
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.probe = led_nu801_probe,
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.remove = led_nu801_remove,
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.driver = {
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.name = "leds-nu801",
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.owner = THIS_MODULE,
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.of_match_table = of_numen_leds_match,
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},
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};
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static int __init led_nu801_init(void)
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{
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return platform_driver_register(&led_nu801_driver);
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}
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static void __exit led_nu801_exit(void)
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{
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platform_driver_unregister(&led_nu801_driver);
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}
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module_init(led_nu801_init);
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module_exit(led_nu801_exit);
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MODULE_AUTHOR("Kevin Paul Herbert <kph@meraki.net>");
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MODULE_DESCRIPTION("NU801 LED driver");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:leds-nu801");
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38
target/linux/ar71xx/files/include/linux/leds-nu801.h
Normal file
38
target/linux/ar71xx/files/include/linux/leds-nu801.h
Normal file
@ -0,0 +1,38 @@
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#ifndef __LEDS_NU801_H__
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#define __LEDS_NU801_H__
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/*
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* Definitions for LED driver for NU801
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*
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* Kevin Paul Herbert
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* Copyright (c) 2012, Meraki, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/leds.h>
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struct led_nu801_template {
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const char *device_name; /* Name of the platform device */
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const char *name; /* Name of this LED chain */
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int num_leds; /* Number of LEDs in the chain */
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unsigned cki; /* GPIO pin for CKI */
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unsigned sdi; /* GPIO pin for SDI */
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int lei; /* GPIO pin for LEI; < 0 if none */
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u32 ndelay; /* Delay in nanoseconds */
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enum led_brightness init_brightness[3]; /* Default rgb state */
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#ifdef CONFIG_LEDS_TRIGGERS
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const char *default_trigger; /* default trigger */
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#endif
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const char *led_colors[3]; /* rgb color order */
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};
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struct led_nu801_platform_data {
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int num_controllers; /* Numnber of controllers */
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struct led_nu801_template *template; /* Template per controller */
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};
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#endif /* __LEDS_NU801_H__ */
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@ -5,6 +5,22 @@
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# See /LICENSE for more information.
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#
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define KernelPackage/leds-nu801
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SUBMENU:=$(LEDS_MENU)
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TITLE:=Meraki MR18 LED support
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DEPENDS:=@TARGET_ar71xx
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KCONFIG:=CONFIG_LEDS_NU801
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FILES:=$(LINUX_DIR)/drivers/leds/leds-nu801.ko
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AUTOLOAD:=$(call AutoLoad,60,leds-nu801)
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endef
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define KernelPackage/leds-nu801/description
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Kernel module for the nu801 LED driver used on the Meraki MR18.
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endef
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$(eval $(call KernelPackage,leds-nu801))
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define KernelPackage/leds-rb750
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SUBMENU:=$(LEDS_MENU)
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TITLE:=RouterBOARD 750 LED support
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@ -0,0 +1,26 @@
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--- a/drivers/leds/Kconfig
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+++ b/drivers/leds/Kconfig
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@@ -500,6 +500,13 @@ config LEDS_MENF21BMC
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comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
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+config LEDS_NU801
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+ tristate "LED driver for NU801 RGB LED"
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+ depends on LEDS_CLASS && ATH79_MACH_MR18
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+ help
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+ This option enables support for NU801 RGB LED driver chips
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+ accessed via GPIO.
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+
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config LEDS_BLINKM
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tristate "LED support for the BlinkM I2C RGB LED"
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depends on LEDS_CLASS
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--- a/drivers/leds/Makefile
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+++ b/drivers/leds/Makefile
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@@ -51,6 +51,7 @@ obj-$(CONFIG_LEDS_ADP5520) += leds-adp5
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obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell-led.o
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obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
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obj-$(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
Block a user