630 lines
15 KiB
C
630 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
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*
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* Copyright (C) 2010 LaCie
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*
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* Author: Simon Guinot <sguinot@lacie.com>
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*/
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#include <linux/module.h>
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#include <linux/irq.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/platform_device.h>
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#include <linux/gpio/consumer.h>
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#include <linux/leds.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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struct netxbig_gpio_ext {
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struct gpio_desc **addr;
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int num_addr;
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struct gpio_desc **data;
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int num_data;
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struct gpio_desc *enable;
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};
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enum netxbig_led_mode {
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NETXBIG_LED_OFF,
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NETXBIG_LED_ON,
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NETXBIG_LED_SATA,
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NETXBIG_LED_TIMER1,
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NETXBIG_LED_TIMER2,
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NETXBIG_LED_MODE_NUM,
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};
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#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM
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struct netxbig_led_timer {
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unsigned long delay_on;
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unsigned long delay_off;
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enum netxbig_led_mode mode;
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};
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struct netxbig_led {
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const char *name;
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const char *default_trigger;
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int mode_addr;
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int *mode_val;
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int bright_addr;
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int bright_max;
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};
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struct netxbig_led_platform_data {
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struct netxbig_gpio_ext *gpio_ext;
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struct netxbig_led_timer *timer;
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int num_timer;
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struct netxbig_led *leds;
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int num_leds;
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};
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/*
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* GPIO extension bus.
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*/
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static DEFINE_SPINLOCK(gpio_ext_lock);
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static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
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{
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int pin;
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for (pin = 0; pin < gpio_ext->num_addr; pin++)
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gpiod_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
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}
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static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
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{
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int pin;
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for (pin = 0; pin < gpio_ext->num_data; pin++)
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gpiod_set_value(gpio_ext->data[pin], (data >> pin) & 1);
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}
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static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
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{
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/* Enable select is done on the raising edge. */
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gpiod_set_value(gpio_ext->enable, 0);
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gpiod_set_value(gpio_ext->enable, 1);
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}
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static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
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int addr, int value)
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{
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unsigned long flags;
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spin_lock_irqsave(&gpio_ext_lock, flags);
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gpio_ext_set_addr(gpio_ext, addr);
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gpio_ext_set_data(gpio_ext, value);
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gpio_ext_enable_select(gpio_ext);
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spin_unlock_irqrestore(&gpio_ext_lock, flags);
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}
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/*
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* Class LED driver.
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*/
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struct netxbig_led_data {
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struct netxbig_gpio_ext *gpio_ext;
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struct led_classdev cdev;
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int mode_addr;
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int *mode_val;
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int bright_addr;
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struct netxbig_led_timer *timer;
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int num_timer;
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enum netxbig_led_mode mode;
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int sata;
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spinlock_t lock;
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};
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static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
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unsigned long delay_on,
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unsigned long delay_off,
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struct netxbig_led_timer *timer,
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int num_timer)
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{
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int i;
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for (i = 0; i < num_timer; i++) {
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if (timer[i].delay_on == delay_on &&
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timer[i].delay_off == delay_off) {
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*mode = timer[i].mode;
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return 0;
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}
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}
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return -EINVAL;
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}
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static int netxbig_led_blink_set(struct led_classdev *led_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 netxbig_led_data *led_dat =
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container_of(led_cdev, struct netxbig_led_data, cdev);
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enum netxbig_led_mode mode;
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int mode_val;
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int ret;
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/* Look for a LED mode with the requested timer frequency. */
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ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off,
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led_dat->timer, led_dat->num_timer);
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if (ret < 0)
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return ret;
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mode_val = led_dat->mode_val[mode];
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if (mode_val == NETXBIG_LED_INVALID_MODE)
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return -EINVAL;
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spin_lock_irq(&led_dat->lock);
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gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
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led_dat->mode = mode;
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spin_unlock_irq(&led_dat->lock);
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return 0;
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}
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static void netxbig_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct netxbig_led_data *led_dat =
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container_of(led_cdev, struct netxbig_led_data, cdev);
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enum netxbig_led_mode mode;
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int mode_val;
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int set_brightness = 1;
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unsigned long flags;
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spin_lock_irqsave(&led_dat->lock, flags);
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if (value == LED_OFF) {
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mode = NETXBIG_LED_OFF;
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set_brightness = 0;
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} else {
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if (led_dat->sata)
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mode = NETXBIG_LED_SATA;
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else if (led_dat->mode == NETXBIG_LED_OFF)
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mode = NETXBIG_LED_ON;
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else /* Keep 'timer' mode. */
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mode = led_dat->mode;
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}
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mode_val = led_dat->mode_val[mode];
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gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
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led_dat->mode = mode;
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/*
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* Note that the brightness register is shared between all the
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* SATA LEDs. So, change the brightness setting for a single
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* SATA LED will affect all the others.
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*/
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if (set_brightness)
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gpio_ext_set_value(led_dat->gpio_ext,
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led_dat->bright_addr, value);
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spin_unlock_irqrestore(&led_dat->lock, flags);
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}
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static ssize_t netxbig_led_sata_store(struct device *dev,
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struct device_attribute *attr,
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const char *buff, size_t count)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct netxbig_led_data *led_dat =
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container_of(led_cdev, struct netxbig_led_data, cdev);
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unsigned long enable;
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enum netxbig_led_mode mode;
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int mode_val;
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int ret;
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ret = kstrtoul(buff, 10, &enable);
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if (ret < 0)
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return ret;
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enable = !!enable;
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spin_lock_irq(&led_dat->lock);
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if (led_dat->sata == enable) {
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ret = count;
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goto exit_unlock;
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}
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if (led_dat->mode != NETXBIG_LED_ON &&
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led_dat->mode != NETXBIG_LED_SATA)
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mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
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else if (enable)
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mode = NETXBIG_LED_SATA;
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else
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mode = NETXBIG_LED_ON;
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mode_val = led_dat->mode_val[mode];
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if (mode_val == NETXBIG_LED_INVALID_MODE) {
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ret = -EINVAL;
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goto exit_unlock;
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}
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gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
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led_dat->mode = mode;
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led_dat->sata = enable;
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ret = count;
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exit_unlock:
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spin_unlock_irq(&led_dat->lock);
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return ret;
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}
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static ssize_t netxbig_led_sata_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct netxbig_led_data *led_dat =
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container_of(led_cdev, struct netxbig_led_data, cdev);
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return sprintf(buf, "%d\n", led_dat->sata);
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}
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static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
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static struct attribute *netxbig_led_attrs[] = {
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&dev_attr_sata.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(netxbig_led);
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static int create_netxbig_led(struct platform_device *pdev,
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struct netxbig_led_platform_data *pdata,
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struct netxbig_led_data *led_dat,
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const struct netxbig_led *template)
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{
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spin_lock_init(&led_dat->lock);
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led_dat->gpio_ext = pdata->gpio_ext;
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led_dat->cdev.name = template->name;
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led_dat->cdev.default_trigger = template->default_trigger;
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led_dat->cdev.blink_set = netxbig_led_blink_set;
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led_dat->cdev.brightness_set = netxbig_led_set;
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/*
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* Because the GPIO extension bus don't allow to read registers
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* value, there is no way to probe the LED initial state.
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* So, the initial sysfs LED value for the "brightness" and "sata"
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* attributes are inconsistent.
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*
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* Note that the initial LED state can't be reconfigured.
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* The reason is that the LED behaviour must stay uniform during
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* the whole boot process (bootloader+linux).
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*/
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led_dat->sata = 0;
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led_dat->cdev.brightness = LED_OFF;
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led_dat->cdev.max_brightness = template->bright_max;
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led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
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led_dat->mode_addr = template->mode_addr;
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led_dat->mode_val = template->mode_val;
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led_dat->bright_addr = template->bright_addr;
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led_dat->timer = pdata->timer;
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led_dat->num_timer = pdata->num_timer;
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/*
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* If available, expose the SATA activity blink capability through
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* a "sata" sysfs attribute.
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*/
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if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
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led_dat->cdev.groups = netxbig_led_groups;
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return devm_led_classdev_register(&pdev->dev, &led_dat->cdev);
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}
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/**
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* netxbig_gpio_ext_remove() - Clean up GPIO extension data
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* @data: managed resource data to clean up
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*
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* Since we pick GPIO descriptors from another device than the device our
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* driver is probing to, we need to register a specific callback to free
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* these up using managed resources.
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*/
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static void netxbig_gpio_ext_remove(void *data)
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{
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struct netxbig_gpio_ext *gpio_ext = data;
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int i;
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for (i = 0; i < gpio_ext->num_addr; i++)
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gpiod_put(gpio_ext->addr[i]);
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for (i = 0; i < gpio_ext->num_data; i++)
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gpiod_put(gpio_ext->data[i]);
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gpiod_put(gpio_ext->enable);
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}
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/**
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* netxbig_gpio_ext_get() - Obtain GPIO extension device data
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* @dev: main LED device
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* @gpio_ext_dev: the GPIO extension device
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* @gpio_ext: the data structure holding the GPIO extension data
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*
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* This function walks the subdevice that only contain GPIO line
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* handles in the device tree and obtains the GPIO descriptors from that
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* device.
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*/
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static int netxbig_gpio_ext_get(struct device *dev,
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struct device *gpio_ext_dev,
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struct netxbig_gpio_ext *gpio_ext)
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{
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struct gpio_desc **addr, **data;
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int num_addr, num_data;
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struct gpio_desc *gpiod;
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int ret;
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int i;
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ret = gpiod_count(gpio_ext_dev, "addr");
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if (ret < 0) {
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dev_err(dev,
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"Failed to count GPIOs in DT property addr-gpios\n");
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return ret;
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}
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num_addr = ret;
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addr = devm_kcalloc(dev, num_addr, sizeof(*addr), GFP_KERNEL);
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if (!addr)
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return -ENOMEM;
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/*
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* We cannot use devm_ managed resources with these GPIO descriptors
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* since they are associated with the "GPIO extension device" which
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* does not probe any driver. The device tree parser will however
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* populate a platform device for it so we can anyway obtain the
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* GPIO descriptors from the device.
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*/
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for (i = 0; i < num_addr; i++) {
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gpiod = gpiod_get_index(gpio_ext_dev, "addr", i,
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GPIOD_OUT_LOW);
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if (IS_ERR(gpiod))
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return PTR_ERR(gpiod);
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gpiod_set_consumer_name(gpiod, "GPIO extension addr");
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addr[i] = gpiod;
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}
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gpio_ext->addr = addr;
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gpio_ext->num_addr = num_addr;
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ret = gpiod_count(gpio_ext_dev, "data");
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if (ret < 0) {
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dev_err(dev,
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"Failed to count GPIOs in DT property data-gpios\n");
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return ret;
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}
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num_data = ret;
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data = devm_kcalloc(dev, num_data, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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for (i = 0; i < num_data; i++) {
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gpiod = gpiod_get_index(gpio_ext_dev, "data", i,
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GPIOD_OUT_LOW);
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if (IS_ERR(gpiod))
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return PTR_ERR(gpiod);
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gpiod_set_consumer_name(gpiod, "GPIO extension data");
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data[i] = gpiod;
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}
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gpio_ext->data = data;
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gpio_ext->num_data = num_data;
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gpiod = gpiod_get(gpio_ext_dev, "enable", GPIOD_OUT_LOW);
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if (IS_ERR(gpiod)) {
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dev_err(dev,
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"Failed to get GPIO from DT property enable-gpio\n");
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return PTR_ERR(gpiod);
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}
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gpiod_set_consumer_name(gpiod, "GPIO extension enable");
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gpio_ext->enable = gpiod;
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return devm_add_action_or_reset(dev, netxbig_gpio_ext_remove, gpio_ext);
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}
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static int netxbig_leds_get_of_pdata(struct device *dev,
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struct netxbig_led_platform_data *pdata)
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{
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struct device_node *np = dev_of_node(dev);
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struct device_node *gpio_ext_np;
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struct platform_device *gpio_ext_pdev;
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struct device *gpio_ext_dev;
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struct device_node *child;
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struct netxbig_gpio_ext *gpio_ext;
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struct netxbig_led_timer *timers;
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struct netxbig_led *leds, *led;
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int num_timers;
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int num_leds = 0;
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int ret;
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int i;
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/* GPIO extension */
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gpio_ext_np = of_parse_phandle(np, "gpio-ext", 0);
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if (!gpio_ext_np) {
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dev_err(dev, "Failed to get DT handle gpio-ext\n");
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return -EINVAL;
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}
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gpio_ext_pdev = of_find_device_by_node(gpio_ext_np);
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if (!gpio_ext_pdev) {
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dev_err(dev, "Failed to find platform device for gpio-ext\n");
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return -ENODEV;
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}
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gpio_ext_dev = &gpio_ext_pdev->dev;
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gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL);
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if (!gpio_ext) {
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of_node_put(gpio_ext_np);
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return -ENOMEM;
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}
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ret = netxbig_gpio_ext_get(dev, gpio_ext_dev, gpio_ext);
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of_node_put(gpio_ext_np);
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if (ret)
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return ret;
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pdata->gpio_ext = gpio_ext;
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/* Timers (optional) */
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ret = of_property_count_u32_elems(np, "timers");
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if (ret > 0) {
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if (ret % 3)
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return -EINVAL;
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num_timers = ret / 3;
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timers = devm_kcalloc(dev, num_timers, sizeof(*timers),
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GFP_KERNEL);
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if (!timers)
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return -ENOMEM;
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for (i = 0; i < num_timers; i++) {
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u32 tmp;
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of_property_read_u32_index(np, "timers", 3 * i,
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&timers[i].mode);
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if (timers[i].mode >= NETXBIG_LED_MODE_NUM)
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return -EINVAL;
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of_property_read_u32_index(np, "timers",
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3 * i + 1, &tmp);
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timers[i].delay_on = tmp;
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of_property_read_u32_index(np, "timers",
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3 * i + 2, &tmp);
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timers[i].delay_off = tmp;
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}
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pdata->timer = timers;
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pdata->num_timer = num_timers;
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}
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/* LEDs */
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num_leds = of_get_child_count(np);
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if (!num_leds) {
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dev_err(dev, "No LED subnodes found in DT\n");
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return -ENODEV;
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}
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leds = devm_kcalloc(dev, num_leds, sizeof(*leds), GFP_KERNEL);
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if (!leds)
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return -ENOMEM;
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led = leds;
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for_each_child_of_node(np, child) {
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const char *string;
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int *mode_val;
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int num_modes;
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ret = of_property_read_u32(child, "mode-addr",
|
|
&led->mode_addr);
|
|
if (ret)
|
|
goto err_node_put;
|
|
|
|
ret = of_property_read_u32(child, "bright-addr",
|
|
&led->bright_addr);
|
|
if (ret)
|
|
goto err_node_put;
|
|
|
|
ret = of_property_read_u32(child, "max-brightness",
|
|
&led->bright_max);
|
|
if (ret)
|
|
goto err_node_put;
|
|
|
|
mode_val =
|
|
devm_kcalloc(dev,
|
|
NETXBIG_LED_MODE_NUM, sizeof(*mode_val),
|
|
GFP_KERNEL);
|
|
if (!mode_val) {
|
|
ret = -ENOMEM;
|
|
goto err_node_put;
|
|
}
|
|
|
|
for (i = 0; i < NETXBIG_LED_MODE_NUM; i++)
|
|
mode_val[i] = NETXBIG_LED_INVALID_MODE;
|
|
|
|
ret = of_property_count_u32_elems(child, "mode-val");
|
|
if (ret < 0 || ret % 2) {
|
|
ret = -EINVAL;
|
|
goto err_node_put;
|
|
}
|
|
num_modes = ret / 2;
|
|
if (num_modes > NETXBIG_LED_MODE_NUM) {
|
|
ret = -EINVAL;
|
|
goto err_node_put;
|
|
}
|
|
|
|
for (i = 0; i < num_modes; i++) {
|
|
int mode;
|
|
int val;
|
|
|
|
of_property_read_u32_index(child,
|
|
"mode-val", 2 * i, &mode);
|
|
of_property_read_u32_index(child,
|
|
"mode-val", 2 * i + 1, &val);
|
|
if (mode >= NETXBIG_LED_MODE_NUM) {
|
|
ret = -EINVAL;
|
|
goto err_node_put;
|
|
}
|
|
mode_val[mode] = val;
|
|
}
|
|
led->mode_val = mode_val;
|
|
|
|
if (!of_property_read_string(child, "label", &string))
|
|
led->name = string;
|
|
else
|
|
led->name = child->name;
|
|
|
|
if (!of_property_read_string(child,
|
|
"linux,default-trigger", &string))
|
|
led->default_trigger = string;
|
|
|
|
led++;
|
|
}
|
|
|
|
pdata->leds = leds;
|
|
pdata->num_leds = num_leds;
|
|
|
|
return 0;
|
|
|
|
err_node_put:
|
|
of_node_put(child);
|
|
return ret;
|
|
}
|
|
|
|
static const struct of_device_id of_netxbig_leds_match[] = {
|
|
{ .compatible = "lacie,netxbig-leds", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_netxbig_leds_match);
|
|
|
|
static int netxbig_led_probe(struct platform_device *pdev)
|
|
{
|
|
struct netxbig_led_platform_data *pdata;
|
|
struct netxbig_led_data *leds_data;
|
|
int i;
|
|
int ret;
|
|
|
|
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return -ENOMEM;
|
|
ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
|
|
if (ret)
|
|
return ret;
|
|
|
|
leds_data = devm_kcalloc(&pdev->dev,
|
|
pdata->num_leds, sizeof(*leds_data),
|
|
GFP_KERNEL);
|
|
if (!leds_data)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < pdata->num_leds; i++) {
|
|
ret = create_netxbig_led(pdev, pdata,
|
|
&leds_data[i], &pdata->leds[i]);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver netxbig_led_driver = {
|
|
.probe = netxbig_led_probe,
|
|
.driver = {
|
|
.name = "leds-netxbig",
|
|
.of_match_table = of_netxbig_leds_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(netxbig_led_driver);
|
|
|
|
MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
|
|
MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:leds-netxbig");
|