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