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397 lines
9.4 KiB
C
397 lines
9.4 KiB
C
/*
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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 <linux/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 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
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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 *
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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 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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