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![Sachin Kamat](/assets/img/avatar_default.png)
'of_match_ptr' is defined in linux/of.h. Include it explicitly. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Bryan Wu <cooloney@gmail.com>
396 lines
9.3 KiB
C
396 lines
9.3 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/init.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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/*
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* The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
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* relation with the SATA activity. This capability is exposed through the
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* "sata" sysfs attribute.
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*
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* The following array detail the different LED registers and the combination
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* of their possible values:
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*
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* cmd_led | slow_led | /SATA active | LED state
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* | | |
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* 1 | 0 | x | off
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* - | 1 | x | on
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* 0 | 0 | 1 | on
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* 0 | 0 | 0 | blink (rate 300ms)
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*/
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enum ns2_led_modes {
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NS_V2_LED_OFF,
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NS_V2_LED_ON,
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NS_V2_LED_SATA,
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};
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struct ns2_led_mode_value {
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enum ns2_led_modes mode;
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int cmd_level;
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int slow_level;
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};
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static struct ns2_led_mode_value ns2_led_modval[] = {
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{ NS_V2_LED_OFF , 1, 0 },
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{ NS_V2_LED_ON , 0, 1 },
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{ NS_V2_LED_ON , 1, 1 },
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{ NS_V2_LED_SATA, 0, 0 },
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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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unsigned char sata; /* True when SATA mode active. */
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rwlock_t rw_lock; /* Lock GPIOs. */
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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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read_lock_irq(&led_dat->rw_lock);
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cmd_level = gpio_get_value(led_dat->cmd);
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slow_level = gpio_get_value(led_dat->slow);
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for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
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if (cmd_level == ns2_led_modval[i].cmd_level &&
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slow_level == ns2_led_modval[i].slow_level) {
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*mode = ns2_led_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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read_unlock_irq(&led_dat->rw_lock);
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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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unsigned long flags;
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write_lock_irqsave(&led_dat->rw_lock, flags);
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for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
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if (mode == ns2_led_modval[i].mode) {
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gpio_set_value(led_dat->cmd,
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ns2_led_modval[i].cmd_level);
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gpio_set_value(led_dat->slow,
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ns2_led_modval[i].slow_level);
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}
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}
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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 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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enum ns2_led_modes mode;
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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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return count;
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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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if (enable && mode == NS_V2_LED_ON)
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ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
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if (!enable && mode == NS_V2_LED_SATA)
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ns2_led_set_mode(led_dat, NS_V2_LED_ON);
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led_dat->sata = enable;
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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 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(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(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.brightness_set = ns2_led_set;
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led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
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led_dat->cmd = template->cmd;
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led_dat->slow = template->slow;
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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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ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
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if (ret < 0)
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goto err_free_cdev;
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return 0;
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err_free_cdev:
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led_classdev_unregister(&led_dat->cdev);
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return ret;
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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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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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#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 *leds;
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int num_leds = 0;
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int i = 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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for_each_child_of_node(np, child) {
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const char *string;
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int ret;
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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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leds[i].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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leds[i].slow = ret;
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ret = of_property_read_string(child, "label", &string);
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leds[i].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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leds[i].default_trigger = string;
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i++;
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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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#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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.owner = THIS_MODULE,
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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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