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449 lines
11 KiB
449 lines
11 KiB
/*
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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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* 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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/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.h>
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#include <linux/leds.h>
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#include <mach/leds-netxbig.h>
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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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gpio_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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gpio_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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gpio_set_value(gpio_ext->enable, 0);
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gpio_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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static int __devinit gpio_ext_init(struct netxbig_gpio_ext *gpio_ext)
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{
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int err;
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int i;
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if (unlikely(!gpio_ext))
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return -EINVAL;
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/* Configure address GPIOs. */
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for (i = 0; i < gpio_ext->num_addr; i++) {
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err = gpio_request(gpio_ext->addr[i], "GPIO extension addr");
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if (err)
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goto err_free_addr;
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err = gpio_direction_output(gpio_ext->addr[i], 0);
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if (err) {
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gpio_free(gpio_ext->addr[i]);
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goto err_free_addr;
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}
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}
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/* Configure data GPIOs. */
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for (i = 0; i < gpio_ext->num_data; i++) {
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err = gpio_request(gpio_ext->data[i], "GPIO extension data");
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if (err)
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goto err_free_data;
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err = gpio_direction_output(gpio_ext->data[i], 0);
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if (err) {
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gpio_free(gpio_ext->data[i]);
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goto err_free_data;
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}
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}
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/* Configure "enable select" GPIO. */
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err = gpio_request(gpio_ext->enable, "GPIO extension enable");
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if (err)
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goto err_free_data;
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err = gpio_direction_output(gpio_ext->enable, 0);
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if (err) {
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gpio_free(gpio_ext->enable);
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goto err_free_data;
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}
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return 0;
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err_free_data:
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for (i = i - 1; i >= 0; i--)
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gpio_free(gpio_ext->data[i]);
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i = gpio_ext->num_addr;
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err_free_addr:
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for (i = i - 1; i >= 0; i--)
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gpio_free(gpio_ext->addr[i]);
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return err;
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}
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static void __devexit gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
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{
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int i;
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gpio_free(gpio_ext->enable);
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for (i = gpio_ext->num_addr - 1; i >= 0; i--)
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gpio_free(gpio_ext->addr[i]);
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for (i = gpio_ext->num_data - 1; i >= 0; i--)
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gpio_free(gpio_ext->data[i]);
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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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int bright_max;
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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, bright_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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bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
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LED_FULL);
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gpio_ext_set_value(led_dat->gpio_ext,
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led_dat->bright_addr, bright_val);
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}
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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 = strict_strtoul(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 void __devexit delete_netxbig_led(struct netxbig_led_data *led_dat)
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{
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if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
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device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
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led_classdev_unregister(&led_dat->cdev);
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}
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static int __devinit
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create_netxbig_led(struct platform_device *pdev,
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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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struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
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int ret;
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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.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->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
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led_dat->timer = pdata->timer;
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led_dat->num_timer = pdata->num_timer;
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ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
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if (ret < 0)
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return ret;
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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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ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
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if (ret)
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led_classdev_unregister(&led_dat->cdev);
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}
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return ret;
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}
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static int __devinit netxbig_led_probe(struct platform_device *pdev)
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{
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struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
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struct netxbig_led_data *leds_data;
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int i;
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int ret;
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if (!pdata)
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return -EINVAL;
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leds_data = kzalloc(sizeof(struct netxbig_led_data) * pdata->num_leds,
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GFP_KERNEL);
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if (!leds_data)
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return -ENOMEM;
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ret = gpio_ext_init(pdata->gpio_ext);
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if (ret < 0)
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goto err_free_data;
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for (i = 0; i < pdata->num_leds; i++) {
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ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]);
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if (ret < 0)
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goto err_free_leds;
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}
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platform_set_drvdata(pdev, leds_data);
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return 0;
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err_free_leds:
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for (i = i - 1; i >= 0; i--)
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delete_netxbig_led(&leds_data[i]);
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gpio_ext_free(pdata->gpio_ext);
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err_free_data:
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kfree(leds_data);
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return ret;
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}
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static int __devexit netxbig_led_remove(struct platform_device *pdev)
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{
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struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
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struct netxbig_led_data *leds_data;
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int i;
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leds_data = platform_get_drvdata(pdev);
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for (i = 0; i < pdata->num_leds; i++)
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delete_netxbig_led(&leds_data[i]);
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gpio_ext_free(pdata->gpio_ext);
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kfree(leds_data);
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return 0;
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}
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static struct platform_driver netxbig_led_driver = {
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.probe = netxbig_led_probe,
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.remove = __devexit_p(netxbig_led_remove),
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.driver = {
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.name = "leds-netxbig",
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.owner = THIS_MODULE,
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},
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};
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MODULE_ALIAS("platform:leds-netxbig");
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static int __init netxbig_led_init(void)
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{
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return platform_driver_register(&netxbig_led_driver);
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}
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static void __exit netxbig_led_exit(void)
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{
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platform_driver_unregister(&netxbig_led_driver);
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}
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module_init(netxbig_led_init);
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module_exit(netxbig_led_exit);
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MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
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MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
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MODULE_LICENSE("GPL");
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