linux/drivers/leds/leds-ns2.c

384 lines
9.1 KiB
C
Raw Normal View History

/*
* 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/init.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_gpio.h>
/*
* The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
* relation with the SATA activity. This capability is exposed through the
* "sata" sysfs attribute.
*
* The following array detail the different LED registers and the combination
* of their possible values:
*
* cmd_led | slow_led | /SATA active | LED state
* | | |
* 1 | 0 | x | off
* - | 1 | x | on
* 0 | 0 | 1 | on
* 0 | 0 | 0 | blink (rate 300ms)
*/
enum ns2_led_modes {
NS_V2_LED_OFF,
NS_V2_LED_ON,
NS_V2_LED_SATA,
};
struct ns2_led_mode_value {
enum ns2_led_modes mode;
int cmd_level;
int slow_level;
};
static struct ns2_led_mode_value ns2_led_modval[] = {
{ NS_V2_LED_OFF , 1, 0 },
{ NS_V2_LED_ON , 0, 1 },
{ NS_V2_LED_ON , 1, 1 },
{ NS_V2_LED_SATA, 0, 0 },
};
struct ns2_led_data {
struct led_classdev cdev;
unsigned cmd;
unsigned slow;
unsigned char sata; /* True when SATA mode active. */
rwlock_t rw_lock; /* Lock GPIOs. */
};
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;
read_lock_irq(&led_dat->rw_lock);
cmd_level = gpio_get_value(led_dat->cmd);
slow_level = gpio_get_value(led_dat->slow);
for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
if (cmd_level == ns2_led_modval[i].cmd_level &&
slow_level == ns2_led_modval[i].slow_level) {
*mode = ns2_led_modval[i].mode;
ret = 0;
break;
}
}
read_unlock_irq(&led_dat->rw_lock);
return ret;
}
static void ns2_led_set_mode(struct ns2_led_data *led_dat,
enum ns2_led_modes mode)
{
int i;
unsigned long flags;
write_lock_irqsave(&led_dat->rw_lock, flags);
for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
if (mode == ns2_led_modval[i].mode) {
gpio_set_value(led_dat->cmd,
ns2_led_modval[i].cmd_level);
gpio_set_value(led_dat->slow,
ns2_led_modval[i].slow_level);
}
}
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 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;
enum ns2_led_modes mode;
ret = kstrtoul(buff, 10, &enable);
if (ret < 0)
return ret;
enable = !!enable;
if (led_dat->sata == enable)
return count;
ret = ns2_led_get_mode(led_dat, &mode);
if (ret < 0)
return ret;
if (enable && mode == NS_V2_LED_ON)
ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
if (!enable && mode == NS_V2_LED_SATA)
ns2_led_set_mode(led_dat, NS_V2_LED_ON);
led_dat->sata = enable;
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 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,
GPIOF_DIR_OUT | gpio_get_value(template->cmd),
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,
GPIOF_DIR_OUT | gpio_get_value(template->slow),
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.brightness_set = ns2_led_set;
led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
led_dat->cmd = template->cmd;
led_dat->slow = template->slow;
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;
ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
if (ret < 0)
goto err_free_cdev;
return 0;
err_free_cdev:
led_classdev_unregister(&led_dat->cdev);
return ret;
}
static void delete_ns2_led(struct ns2_led_data *led_dat)
{
device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
led_classdev_unregister(&led_dat->cdev);
}
#ifdef CONFIG_OF_GPIO
/*
* Translate OpenFirmware node properties into platform_data.
*/
ARM: arm-soc: Board updates for 3.8 This branch contains a set of various board updates for ARM platforms. A few shmobile platforms that are stale have been removed, some defconfig updates for various boards selecting new features such as pinctrl subsystem support, and various updates enabling peripherals, etc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJQyLD0AAoJEIwa5zzehBx3nNYQAI8a1cS/0U1GGXhmYJs4ZJjM 9yeFKOQmv7kQMmqC9b9UhoCtqwsxR4s2qjUps3464q8pZmEXysc+Z5kH/av9ULJw zp62iTxa/qBfnF+UKCt4PAxoL9KvN36XgPH6OADiQ9rvsJ20zF8Agq22CiSF+8AR CfX60joQnd/BEBORP86Zm5AlAeXiah/MrUBQuiCgNq+Ew9bQ0/I15UKZzlLKeQST eYviHjlGPFcXWaxuIgNUQ5KzFfKtSERHHHsiIy9DEi0zq7fLhiwY+eIYUWN34aDp K+bV7wmh6ufa3/Z024Du5FkSI4fIOLz6b5hlJxOzgvQ3AZJ7JK8IYSXCibgUjWxO gFxpVj/MYGf+FlWVQpaf/niMuhYqRAbWy1rsGcmyn8+rb8cHxDHs/3Z4dQTmgxMf 6lEdR4npULAP22MSB71yQtPjn9XW1338a0/a5GPdvihZjwpMH2ZXRxAkGuGpamFT /oXwADuh5a+1uMctXQqb/1FnJcmH/mbEp40bU90AwSqJ6Y8FJts4P5B3H9RQ5rO7 uz/KVB4ilUHGONtrTiNohYbrNLj3t2kNUt8QrQINMWBHSDFHLUbK48QcoqK4uJPB 9RFu9mtovUvfJXVivOoO/BRVnKomUba7fhET1VP4UXiCc7WNtmj36kiXSHbfu3NV /ox1FAH3UU8jB91OeEqV =sgYz -----END PGP SIGNATURE----- Merge tag 'boards' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull ARM SoC board updates from Olof Johansson: "This branch contains a set of various board updates for ARM platforms. A few shmobile platforms that are stale have been removed, some defconfig updates for various boards selecting new features such as pinctrl subsystem support, and various updates enabling peripherals, etc." Fix up conflicts mostly as per Olof. * tag 'boards' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (58 commits) ARM: S3C64XX: Add dummy supplies for Glenfarclas LDOs ARM: S3C64XX: Add registration of WM2200 Bells device on Cragganmore ARM: kirkwood: Add Plat'Home OpenBlocks A6 support ARM: Dove: update defconfig ARM: Kirkwood: update defconfig for new boards arm: orion5x: add DT related options in defconfig arm: orion5x: convert 'LaCie Ethernet Disk mini v2' to Device Tree arm: orion5x: basic Device Tree support arm: orion5x: mechanical defconfig update ARM: kirkwood: Add support for the MPL CEC4 arm: kirkwood: add support for ZyXEL NSA310 ARM: Kirkwood: new board USI Topkick ARM: kirkwood: use gpio-fan DT binding on lsxl ARM: Kirkwood: add Netspace boards to defconfig ARM: kirkwood: DT board setup for Network Space Mini v2 ARM: kirkwood: DT board setup for Network Space Lite v2 ARM: kirkwood: DT board setup for Network Space v2 and parents leds: leds-ns2: add device tree binding ARM: Kirkwood: Enable the second I2C bus ARM: mmp: select pinctrl driver ...
2012-12-12 21:14:06 +01:00
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 *leds;
int num_leds = 0;
int i = 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;
for_each_child_of_node(np, child) {
const char *string;
int ret;
ret = of_get_named_gpio(child, "cmd-gpio", 0);
if (ret < 0)
return ret;
leds[i].cmd = ret;
ret = of_get_named_gpio(child, "slow-gpio", 0);
if (ret < 0)
return ret;
leds[i].slow = ret;
ret = of_property_read_string(child, "label", &string);
leds[i].name = (ret == 0) ? string : child->name;
ret = of_property_read_string(child, "linux,default-trigger",
&string);
if (ret == 0)
leds[i].default_trigger = string;
i++;
}
pdata->leds = leds;
pdata->num_leds = num_leds;
return 0;
}
static const struct of_device_id of_ns2_leds_match[] = {
{ .compatible = "lacie,ns2-leds", },
{},
};
#endif /* CONFIG_OF_GPIO */
static int ns2_led_probe(struct platform_device *pdev)
{
struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
struct ns2_led_data *leds_data;
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 */
leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *
pdata->num_leds, GFP_KERNEL);
if (!leds_data)
return -ENOMEM;
for (i = 0; i < pdata->num_leds; i++) {
ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
if (ret < 0) {
for (i = i - 1; i >= 0; i--)
delete_ns2_led(&leds_data[i]);
return ret;
}
}
platform_set_drvdata(pdev, leds_data);
return 0;
}
static int ns2_led_remove(struct platform_device *pdev)
{
int i;
struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
struct ns2_led_data *leds_data;
leds_data = platform_get_drvdata(pdev);
for (i = 0; i < pdata->num_leds; i++)
delete_ns2_led(&leds_data[i]);
platform_set_drvdata(pdev, NULL);
return 0;
}
static struct platform_driver ns2_led_driver = {
.probe = ns2_led_probe,
.remove = ns2_led_remove,
.driver = {
.name = "leds-ns2",
.owner = THIS_MODULE,
.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");