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/*
* Copyright (C) 2012 Spreadtrum Communications Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/printk.h>
#include <linux/sched.h>
#include <linux/wakelock.h>
#include <linux/bitops.h>
#include <mach/board.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/syscore_ops.h>
#include "spi_gpio_ctrl.h"
#define GPIO_AP_TO_CP 239 /* cp side 71 */
#define GPIO_CP_TO_AP 238 /* cp side 70*/
#define GPIO_AP_WAKEUP_CP 150
#define DRIVER_NAME "spi_gpio"
#define DBG(f, x...) pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
static unsigned int cp_to_ap_irq;
static bool irq_need_change = true;
int cp2ap_sts(void)
{
DBG("spi :cp2ap_sts=%d\r\n",gpio_get_value(GPIO_CP_TO_AP));
return gpio_get_value(GPIO_CP_TO_AP);
}
int ap2cp_sts(void)
{
DBG("spi :ap2cp_sts=%d\r\n",gpio_get_value(GPIO_AP_TO_CP));
return gpio_get_value(GPIO_AP_TO_CP);
}
void ap2cp_enable(void)
{
DBG("spi ap2cp_enable AP_TO_CP_sts is 1\r\n");
gpio_set_value(GPIO_AP_TO_CP, 1);
}
void ap2cp_disable(void)
{
DBG("spi ap2cp_disable AP_TO_CP is 0\r\n");
gpio_set_value(GPIO_AP_TO_CP, 0);
}
void ap2cp_wakeup(void)
{
gpio_set_value(GPIO_AP_WAKEUP_CP, 0);
}
void ap2cp_sleep(void)
{
gpio_set_value(GPIO_AP_WAKEUP_CP, 1);
}
static irqreturn_t cp_to_ap_irq_handle(int irq, void *handle)
{
struct ipc_spi_dev *dev = (struct ipc_spi_dev*)handle;
if(!irq_need_change) {
irq_set_irq_type(cp_to_ap_irq, IRQ_TYPE_EDGE_BOTH);
irq_need_change = true;
}
if(cp2ap_sts())
{
//irq_set_irq_type( irq, IRQF_TRIGGER_LOW);
dev->rx_ctl = CP2AP_RASING;
dev->bneedrcv = true;
/* just for debug */
dev->cp2ap[dev->irq_num % 100].status = 1;
dev->cp2ap[dev->irq_num % 100].time = cpu_clock(0);
}
else
{
//irq_set_irq_type( irq, IRQF_TRIGGER_HIGH);
dev->rx_ctl = CP2AP_FALLING;
dev->bneedrcv = false;
/* just for debug */
dev->cp2ap[dev->irq_num % 100].status = 0;
dev->cp2ap[dev->irq_num % 100].time = cpu_clock(0);
}
dev->irq_num++;
wake_up(&(dev->wait));
return IRQ_HANDLED;
}
static int spi_syscore_suspend(void)
{
if(irq_need_change) {
irq_set_irq_type(cp_to_ap_irq, IRQF_TRIGGER_HIGH);
irq_need_change = false;
}
return 0;
}
static struct syscore_ops spi_syscore_ops = {
.suspend = spi_syscore_suspend,
};
/*****************************************************************************\
* *
* Driver init/exit *
* *
\*****************************************************************************/
int spi_hal_gpio_init(void)
{
int ret;
DBG("spi_hal_gpio init \n");
//config ap_to_cp_rts
ret = gpio_request(GPIO_AP_TO_CP, "ap_to_cp_rts");
if (ret) {
DBG("Cannot request GPIO %d\r\n", GPIO_AP_TO_CP);
gpio_free(GPIO_AP_TO_CP);
return ret;
}
gpio_direction_output(GPIO_AP_TO_CP, 0);
gpio_export(GPIO_AP_TO_CP, 1);
//config GPIO_AP_WAKEUP_CP
ret = gpio_request(GPIO_AP_WAKEUP_CP, "ap_wakeup_cp");
if (ret) {
DBG("Cannot request GPIO %d\r\n", GPIO_AP_WAKEUP_CP);
gpio_free(GPIO_AP_WAKEUP_CP);
return ret;
}
gpio_direction_output(GPIO_AP_WAKEUP_CP, 1);
gpio_export(GPIO_AP_WAKEUP_CP, 1);
//config cp_out_rdy
ret = gpio_request(GPIO_CP_TO_AP, "cp_out_rdy");
if (ret) {
DBG("Cannot request GPIO %d\r\n",GPIO_CP_TO_AP);
gpio_free(GPIO_CP_TO_AP);
return ret;
}
gpio_direction_input(GPIO_CP_TO_AP);
gpio_export(GPIO_CP_TO_AP, 1);
return 0;
}
int spi_hal_gpio_irq_init(struct ipc_spi_dev *dev)
{
int ret;
DBG("spi_hal_gpio_irq_init \n");
cp_to_ap_irq = gpio_to_irq(GPIO_CP_TO_AP);
if (cp_to_ap_irq < 0)
return -1;
ret = request_irq(cp_to_ap_irq, cp_to_ap_irq_handle,
IRQF_NO_SUSPEND | IRQF_DISABLED|IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, "cp_to_ap_irq", (void*)dev);
if (ret) {
DBG("lee :cannot alloc cp_to_ap_rdy_irq, err %d\r\r\n", ret);
return ret;
}
enable_irq_wake(cp_to_ap_irq);
register_syscore_ops(&spi_syscore_ops);
return 0;
}
void spi_hal_gpio_exit(void)
{
DBG("spi_hal_gpio_exit gpio exit\r\n");
gpio_free(GPIO_AP_TO_CP);
gpio_free(GPIO_CP_TO_AP);
free_irq(cp_to_ap_irq, NULL);
}
MODULE_AUTHOR("zhongping.tan<zhongping.tan@spreadtrum.com>");
MODULE_DESCRIPTION("GPIO driver about mux spi");
MODULE_LICENSE("GPL");
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