177 lines
4.1 KiB
C
177 lines
4.1 KiB
C
/*
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* Servergy CTS-1000 Setup
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*
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* Maintained by Ben Collins <ben.c@servergy.com>
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*
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* Copyright 2012 by Servergy, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/of_gpio.h>
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#include <linux/of_irq.h>
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#include <linux/workqueue.h>
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#include <linux/reboot.h>
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#include <linux/interrupt.h>
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#include <asm/machdep.h>
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static struct device_node *halt_node;
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static const struct of_device_id child_match[] = {
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{
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.compatible = "sgy,gpio-halt",
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},
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{},
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};
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static void gpio_halt_wfn(struct work_struct *work)
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{
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/* Likely wont return */
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orderly_poweroff(true);
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}
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static DECLARE_WORK(gpio_halt_wq, gpio_halt_wfn);
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static void gpio_halt_cb(void)
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{
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enum of_gpio_flags flags;
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int trigger, gpio;
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if (!halt_node)
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return;
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gpio = of_get_gpio_flags(halt_node, 0, &flags);
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if (!gpio_is_valid(gpio))
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return;
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trigger = (flags == OF_GPIO_ACTIVE_LOW);
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printk(KERN_INFO "gpio-halt: triggering GPIO.\n");
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/* Probably wont return */
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gpio_set_value(gpio, trigger);
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}
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/* This IRQ means someone pressed the power button and it is waiting for us
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* to handle the shutdown/poweroff. */
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static irqreturn_t gpio_halt_irq(int irq, void *__data)
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{
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printk(KERN_INFO "gpio-halt: shutdown due to power button IRQ.\n");
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schedule_work(&gpio_halt_wq);
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return IRQ_HANDLED;
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};
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static int gpio_halt_probe(struct platform_device *pdev)
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{
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enum of_gpio_flags flags;
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struct device_node *node = pdev->dev.of_node;
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int gpio, err, irq;
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int trigger;
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if (!node)
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return -ENODEV;
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/* If there's no matching child, this isn't really an error */
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halt_node = of_find_matching_node(node, child_match);
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if (!halt_node)
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return 0;
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/* Technically we could just read the first one, but punish
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* DT writers for invalid form. */
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if (of_gpio_count(halt_node) != 1)
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return -EINVAL;
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/* Get the gpio number relative to the dynamic base. */
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gpio = of_get_gpio_flags(halt_node, 0, &flags);
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if (!gpio_is_valid(gpio))
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return -EINVAL;
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err = gpio_request(gpio, "gpio-halt");
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if (err) {
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printk(KERN_ERR "gpio-halt: error requesting GPIO %d.\n",
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gpio);
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halt_node = NULL;
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return err;
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}
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trigger = (flags == OF_GPIO_ACTIVE_LOW);
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gpio_direction_output(gpio, !trigger);
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/* Now get the IRQ which tells us when the power button is hit */
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irq = irq_of_parse_and_map(halt_node, 0);
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err = request_irq(irq, gpio_halt_irq, IRQF_TRIGGER_RISING |
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IRQF_TRIGGER_FALLING, "gpio-halt", halt_node);
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if (err) {
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printk(KERN_ERR "gpio-halt: error requesting IRQ %d for "
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"GPIO %d.\n", irq, gpio);
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gpio_free(gpio);
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halt_node = NULL;
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return err;
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}
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/* Register our halt function */
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ppc_md.halt = gpio_halt_cb;
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ppc_md.power_off = gpio_halt_cb;
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printk(KERN_INFO "gpio-halt: registered GPIO %d (%d trigger, %d"
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" irq).\n", gpio, trigger, irq);
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return 0;
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}
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static int gpio_halt_remove(struct platform_device *pdev)
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{
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if (halt_node) {
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int gpio = of_get_gpio(halt_node, 0);
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int irq = irq_of_parse_and_map(halt_node, 0);
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free_irq(irq, halt_node);
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ppc_md.halt = NULL;
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ppc_md.power_off = NULL;
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gpio_free(gpio);
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halt_node = NULL;
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}
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return 0;
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}
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static const struct of_device_id gpio_halt_match[] = {
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/* We match on the gpio bus itself and scan the children since they
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* wont be matched against us. We know the bus wont match until it
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* has been registered too. */
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{
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.compatible = "fsl,qoriq-gpio",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, gpio_halt_match);
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static struct platform_driver gpio_halt_driver = {
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.driver = {
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.name = "gpio-halt",
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.owner = THIS_MODULE,
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.of_match_table = gpio_halt_match,
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},
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.probe = gpio_halt_probe,
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.remove = gpio_halt_remove,
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};
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module_platform_driver(gpio_halt_driver);
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MODULE_DESCRIPTION("Driver to support GPIO triggered system halt for Servergy CTS-1000 Systems.");
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MODULE_VERSION("1.0");
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MODULE_AUTHOR("Ben Collins <ben.c@servergy.com>");
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MODULE_LICENSE("GPL");
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