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/*
* hsi_driver_gpio.c
*
* Implements HSI GPIO related functionality. (i.e: wake lines management)
*
* Copyright (C) 2007-2008 Nokia Corporation. All rights reserved.
* Copyright (C) 2009 Texas Instruments, Inc.
*
* Author: Carlos Chinea <carlos.chinea@nokia.com>
* Author: Sebastien JAN <s-jan@ti.com>
*
* This package is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <linux/gpio.h>
#include "hsi_driver.h"
static void do_hsi_cawake_tasklet(unsigned long hsi_p)
{
struct hsi_port *port = (struct hsi_port *)hsi_p;
struct hsi_dev *hsi_ctrl = port->hsi_controller;
spin_lock(&hsi_ctrl->lock);
hsi_clocks_enable(hsi_ctrl->dev, __func__);
port->in_cawake_tasklet = true;
port->cawake_status = hsi_get_cawake(port);
hsi_do_cawake_process(port);
port->in_cawake_tasklet = false;
hsi_clocks_disable(hsi_ctrl->dev, __func__);
spin_unlock(&hsi_ctrl->lock);
}
static irqreturn_t hsi_cawake_isr(int irq, void *hsi_p)
{
struct hsi_port *port = hsi_p;
tasklet_hi_schedule(&port->cawake_tasklet);
return IRQ_HANDLED;
}
int __init hsi_cawake_init(struct hsi_port *port, const char *irq_name)
{
tasklet_init(&port->cawake_tasklet, do_hsi_cawake_tasklet,
(unsigned long)port);
if (request_irq(port->cawake_gpio_irq, hsi_cawake_isr,
IRQF_DISABLED | IRQF_TRIGGER_RISING |
IRQF_TRIGGER_FALLING, irq_name, port) < 0) {
dev_err(port->hsi_controller->dev,
"FAILED to request %s GPIO IRQ %d on port %d\n",
irq_name, port->cawake_gpio_irq, port->port_number);
return -EBUSY;
}
return 0;
}
void hsi_cawake_exit(struct hsi_port *port)
{
if (port->cawake_gpio < 0)
return; /* Nothing to do (case SSI with GPIO or */
/* HSI with IO ring wakeup */
tasklet_kill(&port->cawake_tasklet);
free_irq(port->cawake_gpio_irq, port);
}
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