/*
* leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
*
* Copyright (C) 2010 LaCie
*
* Author: Simon Guinot <sguinot@lacie.com>
*
* Based on leds-gpio.c by Raphael Assenat <raph@8d.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/kernel.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_data/leds-kirkwood-ns2.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include "leds.h"
/*
* The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
* modes are available: off, on and SATA activity blinking. The LED modes are
* controlled through two GPIOs (command and slow): each combination of values
* for the command/slow GPIOs corresponds to a LED mode.
*/
struct ns2_led_data {
struct led_classdev cdev;
unsigned cmd;
unsigned slow;
bool can_sleep;
unsigned char sata; /* True when SATA mode active. */
rwlock_t rw_lock; /* Lock GPIOs. */
int num_modes;
struct ns2_led_modval *modval;
};
static int ns2_led_get_mode(struct ns2_led_data *led_dat,
enum ns2_led_modes *mode)
{
int i;
int ret = -EINVAL;
int cmd_level;
int slow_level;
cmd_level = gpio_get_value_cansleep(led_dat->cmd);
slow_level = gpio_get_value_cansleep(led_dat->slow);
for (i = 0; i < led_dat->num_modes; i++) {
if (cmd_level == led_dat->modval[i].cmd_level &&
slow_level == led_dat->modval[i].slow_level) {
*mode = led_dat->modval[i].mode;
ret = 0;
break;
}
}
return ret;
}
static void ns2_led_set_mode(struct ns2_led_data *led_dat,
enum ns2_led_modes mode)
{
int i;
bool found = false;
unsigned long flags;
for (i = 0; i < led_dat->num_modes; i++)
if (mode == led_dat->modval[i].mode) {
found = true;
break;
}
if (!found)
return;
write_lock_irqsave(&led_dat->rw_lock, flags);
if (!led_dat->can_sleep) {
gpio_set_value(led_dat->cmd,
led_dat->modval[i].cmd_level);
gpio_set_value(led_dat->slow,
led_dat->modval[i].slow_level);
goto exit_unlock;
}
gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
exit_unlock:
write_unlock_irqrestore(&led_dat->rw_lock, flags);
}
static void ns2_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct ns2_led_data *led_dat =
container_of(led_cdev, struct ns2_led_data, cdev);
enum ns2_led_modes mode;
if (value == LED_OFF)
mode = NS_V2_LED_OFF;
else if (led_dat->sata)
mode = NS_V2_LED_SATA;
else
mode = NS_V2_LED_ON;
ns2_led_set_mode(led_dat, mode);
}
static int ns2_led_set_blocking(struct led_classdev *led_cdev,
enum led_brightness value)
{
ns2_led_set(led_cdev, value);
return 0;
}
static ssize_t ns2_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 ns2_led_data *led_dat =
container_of(led_cdev, struct ns2_led_data, cdev);
int ret;
unsigned long enable;
ret = kstrtoul(buff, 10, &enable);
if (ret < 0)
return ret;
enable = !!enable;
if (led_dat->sata == enable)
goto exit;
led_dat->sata = enable;
if (!led_get_brightness(led_cdev))
goto exit;
if (enable)
ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
else
ns2_led_set_mode(led_dat, NS_V2_LED_ON);
exit:
return count;
}
static ssize_t ns2_led_sata_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct ns2_led_data *led_dat =
container_of(led_cdev, struct ns2_led_data, cdev);
return sprintf(buf, "%d\n", led_dat->sata);
}
static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
static struct attribute *ns2_led_attrs[] = {
&dev_attr_sata.attr,
NULL
};
ATTRIBUTE_GROUPS(ns2_led);
static int
create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
const struct ns2_led *template)
{
int ret;
enum ns2_led_modes mode;
ret = devm_gpio_request_one(&pdev->dev, template->cmd,
gpio_get_value_cansleep(template->cmd) ?
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
template->name);
if (ret) {
dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
template->name);
return ret;
}
ret = devm_gpio_request_one(&pdev->dev, template->slow,
gpio_get_value_cansleep(template->slow) ?
GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
template->name);
if (ret) {
dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
template->name);
return ret;
}
rwlock_init(&led_dat->rw_lock);
led_dat->cdev.name = template->name;
led_dat->cdev.default_trigger = template->default_trigger;
led_dat->cdev.blink_set = NULL;
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
led_dat->cdev.groups = ns2_led_groups;
led_dat->cmd = template->cmd;
led_dat->slow = template->slow;
led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
gpio_cansleep(led_dat->slow);
if (led_dat->can_sleep)
led_dat->cdev.brightness_set_blocking = ns2_led_set_blocking;
else
led_dat->cdev.brightness_set = ns2_led_set;
led_dat->modval = template->modval;
led_dat->num_modes = template->num_modes;
ret = ns2_led_get_mode(led_dat, &mode);
if (ret < 0)
return ret;
/* Set LED initial state. */
led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
led_dat->cdev.brightness =
(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
if (ret < 0)
return ret;
return 0;
}
static void delete_ns2_led(struct ns2_led_data *led_dat)
{
led_classdev_unregister(&led_dat->cdev);
}
#ifdef CONFIG_OF_GPIO
/*
* Translate OpenFirmware node properties into platform_data.
*/
static int
ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
{
struct device_node *np = dev->of_node;
struct device_node *child;
struct ns2_led *led, *leds;
int num_leds = 0;
num_leds = of_get_child_count(np);
if (!num_leds)
return -ENODEV;
leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
GFP_KERNEL);
if (!leds)
return -ENOMEM;
led = leds;
for_each_child_of_node(np, child) {
const char *string;
int ret, i, num_modes;
struct ns2_led_modval *modval;
ret = of_get_named_gpio(child, "cmd-gpio", 0);
if (ret < 0)
return ret;
led->cmd = ret;
ret = of_get_named_gpio(child, "slow-gpio", 0);
if (ret < 0)
return ret;
led->slow = ret;
ret = of_property_read_string(child, "label", &string);
led->name = (ret == 0) ? string : child->name;
ret = of_property_read_string(child, "linux,default-trigger",
&string);
if (ret == 0)
led->default_trigger = string;
ret = of_property_count_u32_elems(child, "modes-map");
if (ret < 0 || ret % 3) {
dev_err(dev,
"Missing or malformed modes-map property\n");
return -EINVAL;
}
num_modes = ret / 3;
modval = devm_kzalloc(dev,
num_modes * sizeof(struct ns2_led_modval),
GFP_KERNEL);
if (!modval)
return -ENOMEM;
for (i = 0; i < num_modes; i++) {
of_property_read_u32_index(child,
"modes-map", 3 * i,
(u32 *) &modval[i].mode);
of_property_read_u32_index(child,
"modes-map", 3 * i + 1,
(u32 *) &modval[i].cmd_level);
of_property_read_u32_index(child,
"modes-map", 3 * i + 2,
(u32 *) &modval[i].slow_level);
}
led->num_modes = num_modes;
led->modval = modval;
led++;
}
pdata->leds = leds;
pdata->num_leds = num_leds;
return 0;
}
static const struct of_device_id of_ns2_leds_match[] = {
{ .compatible = "lacie,ns2-leds", },
{},
};
MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
#endif /* CONFIG_OF_GPIO */
struct ns2_led_priv {
int num_leds;
struct ns2_led_data leds_data[];
};
static inline int sizeof_ns2_led_priv(int num_leds)
{
return sizeof(struct ns2_led_priv) +
(sizeof(struct ns2_led_data) * num_leds);
}
static int ns2_led_probe(struct platform_device *pdev)
{
struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct ns2_led_priv *priv;
int i;
int ret;
#ifdef CONFIG_OF_GPIO
if (!pdata) {
pdata = devm_kzalloc(&pdev->dev,
sizeof(struct ns2_led_platform_data),
GFP_KERNEL);
if (!pdata)
return -ENOMEM;
ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
if (ret)
return ret;
}
#else
if (!pdata)
return -EINVAL;
#endif /* CONFIG_OF_GPIO */
priv = devm_kzalloc(&pdev->dev,
sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->num_leds = pdata->num_leds;
for (i = 0; i < priv->num_leds; i++) {
ret = create_ns2_led(pdev, &priv->leds_data[i],
&pdata->leds[i]);
if (ret < 0) {
for (i = i - 1; i >= 0; i--)
delete_ns2_led(&priv->leds_data[i]);
return ret;
}
}
platform_set_drvdata(pdev, priv);
return 0;
}
static int ns2_led_remove(struct platform_device *pdev)
{
int i;
struct ns2_led_priv *priv;
priv = platform_get_drvdata(pdev);
for (i = 0; i < priv->num_leds; i++)
delete_ns2_led(&priv->leds_data[i]);
return 0;
}
static struct platform_driver ns2_led_driver = {
.probe = ns2_led_probe,
.remove = ns2_led_remove,
.driver = {
.name = "leds-ns2",
.of_match_table = of_match_ptr(of_ns2_leds_match),
},
};
module_platform_driver(ns2_led_driver);
MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
MODULE_DESCRIPTION("Network Space v2 LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:leds-ns2");
