leds: add LED driver for Big Network series LEDs

This patch add a LED class driver for LEDs found on the LaCie 2Big and
5Big Network v2 boards. The LEDs are wired to a CPLD and are controlled
through a GPIO extension bus.

Signed-off-by: Simon Guinot <sguinot@lacie.com>
Signed-off-by: Nicolas Pitre <nico@fluxnic.net>
This commit is contained in:
Simon Guinot 2010-10-07 16:38:49 +02:00 коммит произвёл Nicolas Pitre
Родитель e5971bbc1c
Коммит 2446783250
4 изменённых файлов: 514 добавлений и 0 удалений

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@ -0,0 +1,55 @@
/*
* arch/arm/mach-kirkwood/include/mach/leds-netxbig.h
*
* Platform data structure for netxbig LED driver
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#ifndef __MACH_LEDS_NETXBIG_H
#define __MACH_LEDS_NETXBIG_H
struct netxbig_gpio_ext {
unsigned *addr;
int num_addr;
unsigned *data;
int num_data;
unsigned enable;
};
enum netxbig_led_mode {
NETXBIG_LED_OFF,
NETXBIG_LED_ON,
NETXBIG_LED_SATA,
NETXBIG_LED_TIMER1,
NETXBIG_LED_TIMER2,
NETXBIG_LED_MODE_NUM,
};
#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM
struct netxbig_led_timer {
unsigned long delay_on;
unsigned long delay_off;
enum netxbig_led_mode mode;
};
struct netxbig_led {
const char *name;
const char *default_trigger;
int mode_addr;
int *mode_val;
int bright_addr;
};
struct netxbig_led_platform_data {
struct netxbig_gpio_ext *gpio_ext;
struct netxbig_led_timer *timer;
int num_timer;
struct netxbig_led *leds;
int num_leds;
};
#endif /* __MACH_LEDS_NETXBIG_H */

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@ -311,6 +311,15 @@ config LEDS_NS2
Network Space v2 board (and parents). This include Internet Space v2, Network Space v2 board (and parents). This include Internet Space v2,
Network Space (Max) v2 and d2 Network v2 boards. Network Space (Max) v2 and d2 Network v2 boards.
config LEDS_NETXBIG
tristate "LED support for Big Network series LEDs"
depends on MACH_NET2BIG_V2 || MACH_NET5BIG_V2
default y
help
This option enable support for LEDs found on the LaCie 2Big
and 5Big Network v2 boards. The LEDs are wired to a CPLD and are
controlled through a GPIO extension bus.
config LEDS_TRIGGERS config LEDS_TRIGGERS
bool "LED Trigger support" bool "LED Trigger support"
help help

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@ -38,6 +38,7 @@ obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o
obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell-led.o obj-$(CONFIG_LEDS_DELL_NETBOOKS) += dell-led.o
obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o obj-$(CONFIG_LEDS_MC13783) += leds-mc13783.o
obj-$(CONFIG_LEDS_NS2) += leds-ns2.o obj-$(CONFIG_LEDS_NS2) += leds-ns2.o
obj-$(CONFIG_LEDS_NETXBIG) += leds-netxbig.o
# LED SPI Drivers # LED SPI Drivers
obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o

449
drivers/leds/leds-netxbig.c Normal file
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@ -0,0 +1,449 @@
/*
* leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
*
* Copyright (C) 2010 LaCie
*
* Author: Simon Guinot <sguinot@lacie.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <mach/leds-netxbig.h>
/*
* GPIO extension bus.
*/
static DEFINE_SPINLOCK(gpio_ext_lock);
static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
{
int pin;
for (pin = 0; pin < gpio_ext->num_addr; pin++)
gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
}
static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
{
int pin;
for (pin = 0; pin < gpio_ext->num_data; pin++)
gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
}
static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
{
/* Enable select is done on the raising edge. */
gpio_set_value(gpio_ext->enable, 0);
gpio_set_value(gpio_ext->enable, 1);
}
static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
int addr, int value)
{
unsigned long flags;
spin_lock_irqsave(&gpio_ext_lock, flags);
gpio_ext_set_addr(gpio_ext, addr);
gpio_ext_set_data(gpio_ext, value);
gpio_ext_enable_select(gpio_ext);
spin_unlock_irqrestore(&gpio_ext_lock, flags);
}
static int __devinit gpio_ext_init(struct netxbig_gpio_ext *gpio_ext)
{
int err;
int i;
if (unlikely(!gpio_ext))
return -EINVAL;
/* Configure address GPIOs. */
for (i = 0; i < gpio_ext->num_addr; i++) {
err = gpio_request(gpio_ext->addr[i], "GPIO extension addr");
if (err)
goto err_free_addr;
err = gpio_direction_output(gpio_ext->addr[i], 0);
if (err) {
gpio_free(gpio_ext->addr[i]);
goto err_free_addr;
}
}
/* Configure data GPIOs. */
for (i = 0; i < gpio_ext->num_data; i++) {
err = gpio_request(gpio_ext->data[i], "GPIO extension data");
if (err)
goto err_free_data;
err = gpio_direction_output(gpio_ext->data[i], 0);
if (err) {
gpio_free(gpio_ext->data[i]);
goto err_free_data;
}
}
/* Configure "enable select" GPIO. */
err = gpio_request(gpio_ext->enable, "GPIO extension enable");
if (err)
goto err_free_data;
err = gpio_direction_output(gpio_ext->enable, 0);
if (err) {
gpio_free(gpio_ext->enable);
goto err_free_data;
}
return 0;
err_free_data:
for (i = i - 1; i >= 0; i--)
gpio_free(gpio_ext->data[i]);
i = gpio_ext->num_addr;
err_free_addr:
for (i = i - 1; i >= 0; i--)
gpio_free(gpio_ext->addr[i]);
return err;
}
static void __devexit gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
{
int i;
gpio_free(gpio_ext->enable);
for (i = gpio_ext->num_addr - 1; i >= 0; i--)
gpio_free(gpio_ext->addr[i]);
for (i = gpio_ext->num_data - 1; i >= 0; i--)
gpio_free(gpio_ext->data[i]);
}
/*
* Class LED driver.
*/
struct netxbig_led_data {
struct netxbig_gpio_ext *gpio_ext;
struct led_classdev cdev;
int mode_addr;
int *mode_val;
int bright_addr;
int bright_max;
struct netxbig_led_timer *timer;
int num_timer;
enum netxbig_led_mode mode;
int sata;
spinlock_t lock;
};
static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
unsigned long delay_on,
unsigned long delay_off,
struct netxbig_led_timer *timer,
int num_timer)
{
int i;
for (i = 0; i < num_timer; i++) {
if (timer[i].delay_on == delay_on &&
timer[i].delay_off == delay_off) {
*mode = timer[i].mode;
return 0;
}
}
return -EINVAL;
}
static int netxbig_led_blink_set(struct led_classdev *led_cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
struct netxbig_led_data *led_dat =
container_of(led_cdev, struct netxbig_led_data, cdev);
enum netxbig_led_mode mode;
int mode_val;
int ret;
/* Look for a LED mode with the requested timer frequency. */
ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off,
led_dat->timer, led_dat->num_timer);
if (ret < 0)
return ret;
mode_val = led_dat->mode_val[mode];
if (mode_val == NETXBIG_LED_INVALID_MODE)
return -EINVAL;
spin_lock_irq(&led_dat->lock);
gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
led_dat->mode = mode;
spin_unlock_irq(&led_dat->lock);
return 0;
}
static void netxbig_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct netxbig_led_data *led_dat =
container_of(led_cdev, struct netxbig_led_data, cdev);
enum netxbig_led_mode mode;
int mode_val, bright_val;
int set_brightness = 1;
unsigned long flags;
spin_lock_irqsave(&led_dat->lock, flags);
if (value == LED_OFF) {
mode = NETXBIG_LED_OFF;
set_brightness = 0;
} else {
if (led_dat->sata)
mode = NETXBIG_LED_SATA;
else if (led_dat->mode == NETXBIG_LED_OFF)
mode = NETXBIG_LED_ON;
else /* Keep 'timer' mode. */
mode = led_dat->mode;
}
mode_val = led_dat->mode_val[mode];
gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
led_dat->mode = mode;
/*
* Note that the brightness register is shared between all the
* SATA LEDs. So, change the brightness setting for a single
* SATA LED will affect all the others.
*/
if (set_brightness) {
bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
LED_FULL);
gpio_ext_set_value(led_dat->gpio_ext,
led_dat->bright_addr, bright_val);
}
spin_unlock_irqrestore(&led_dat->lock, flags);
}
static ssize_t netxbig_led_sata_store(struct device *dev,
struct device_attribute *attr,
const char *buff, size_t count)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct netxbig_led_data *led_dat =
container_of(led_cdev, struct netxbig_led_data, cdev);
unsigned long enable;
enum netxbig_led_mode mode;
int mode_val;
int ret;
ret = strict_strtoul(buff, 10, &enable);
if (ret < 0)
return ret;
enable = !!enable;
spin_lock_irq(&led_dat->lock);
if (led_dat->sata == enable) {
ret = count;
goto exit_unlock;
}
if (led_dat->mode != NETXBIG_LED_ON &&
led_dat->mode != NETXBIG_LED_SATA)
mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
else if (enable)
mode = NETXBIG_LED_SATA;
else
mode = NETXBIG_LED_ON;
mode_val = led_dat->mode_val[mode];
if (mode_val == NETXBIG_LED_INVALID_MODE) {
ret = -EINVAL;
goto exit_unlock;
}
gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
led_dat->mode = mode;
led_dat->sata = enable;
ret = count;
exit_unlock:
spin_unlock_irq(&led_dat->lock);
return ret;
}
static ssize_t netxbig_led_sata_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct netxbig_led_data *led_dat =
container_of(led_cdev, struct netxbig_led_data, cdev);
return sprintf(buf, "%d\n", led_dat->sata);
}
static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
static void __devexit delete_netxbig_led(struct netxbig_led_data *led_dat)
{
if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
led_classdev_unregister(&led_dat->cdev);
}
static int __devinit
create_netxbig_led(struct platform_device *pdev,
struct netxbig_led_data *led_dat,
const struct netxbig_led *template)
{
struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
int ret;
spin_lock_init(&led_dat->lock);
led_dat->gpio_ext = pdata->gpio_ext;
led_dat->cdev.name = template->name;
led_dat->cdev.default_trigger = template->default_trigger;
led_dat->cdev.blink_set = netxbig_led_blink_set;
led_dat->cdev.brightness_set = netxbig_led_set;
/*
* Because the GPIO extension bus don't allow to read registers
* value, there is no way to probe the LED initial state.
* So, the initial sysfs LED value for the "brightness" and "sata"
* attributes are inconsistent.
*
* Note that the initial LED state can't be reconfigured.
* The reason is that the LED behaviour must stay uniform during
* the whole boot process (bootloader+linux).
*/
led_dat->sata = 0;
led_dat->cdev.brightness = LED_OFF;
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
led_dat->mode_addr = template->mode_addr;
led_dat->mode_val = template->mode_val;
led_dat->bright_addr = template->bright_addr;
led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
led_dat->timer = pdata->timer;
led_dat->num_timer = pdata->num_timer;
ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
if (ret < 0)
return ret;
/*
* If available, expose the SATA activity blink capability through
* a "sata" sysfs attribute.
*/
if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) {
ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
if (ret)
led_classdev_unregister(&led_dat->cdev);
}
return ret;
}
static int __devinit netxbig_led_probe(struct platform_device *pdev)
{
struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
struct netxbig_led_data *leds_data;
int i;
int ret;
if (!pdata)
return -EINVAL;
leds_data = kzalloc(sizeof(struct netxbig_led_data) * pdata->num_leds,
GFP_KERNEL);
if (!leds_data)
return -ENOMEM;
ret = gpio_ext_init(pdata->gpio_ext);
if (ret < 0)
goto err_free_data;
for (i = 0; i < pdata->num_leds; i++) {
ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]);
if (ret < 0)
goto err_free_leds;
}
platform_set_drvdata(pdev, leds_data);
return 0;
err_free_leds:
for (i = i - 1; i >= 0; i--)
delete_netxbig_led(&leds_data[i]);
gpio_ext_free(pdata->gpio_ext);
err_free_data:
kfree(leds_data);
return ret;
}
static int __devexit netxbig_led_remove(struct platform_device *pdev)
{
struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
struct netxbig_led_data *leds_data;
int i;
leds_data = platform_get_drvdata(pdev);
for (i = 0; i < pdata->num_leds; i++)
delete_netxbig_led(&leds_data[i]);
gpio_ext_free(pdata->gpio_ext);
kfree(leds_data);
return 0;
}
static struct platform_driver netxbig_led_driver = {
.probe = netxbig_led_probe,
.remove = __devexit_p(netxbig_led_remove),
.driver = {
.name = "leds-netxbig",
.owner = THIS_MODULE,
},
};
MODULE_ALIAS("platform:leds-netxbig");
static int __init netxbig_led_init(void)
{
return platform_driver_register(&netxbig_led_driver);
}
static void __exit netxbig_led_exit(void)
{
platform_driver_unregister(&netxbig_led_driver);
}
module_init(netxbig_led_init);
module_exit(netxbig_led_exit);
MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
MODULE_LICENSE("GPL");