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/* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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/module.h>
#include <linux/platform_device.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/ioctl.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/debugfs.h>
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/clk.h>
#ifndef CONFIG_ARCH_EXYNOS
#include <linux/mfd/pmic8058.h>
#endif
#include <asm/mach-types.h>
#include <asm/uaccess.h>
#include <mach/mdm2.h>
#include <mach/restart.h>
#include <mach/subsystem_notif.h>
#include <mach/subsystem_restart.h>
#include <linux/msm_charm.h>
#ifndef CONFIG_ARCH_EXYNOS
#include "msm_watchdog.h"
#include "devices.h"
#include "clock.h"
#endif
#include "mdm_private.h"
#include <linux/wakelock.h>
#define MDM_MODEM_TIMEOUT 6000
#define MDM_HOLD_TIME 4000
#define MDM_MODEM_DELTA 100
static int mdm_debug_on;
static int power_on_count;
static int hsic_peripheral_status = 1;
static DEFINE_MUTEX(hsic_status_lock);
static void mdm_peripheral_connect(struct mdm_modem_drv *mdm_drv)
{
pr_err("%s\n", __func__);
mutex_lock(&hsic_status_lock);
if (hsic_peripheral_status)
goto out;
if (mdm_drv->pdata->peripheral_platform_device)
platform_device_add(mdm_drv->pdata->peripheral_platform_device);
hsic_peripheral_status = 1;
out:
mutex_unlock(&hsic_status_lock);
pr_err("%s : ap2mdm_status = %d\n", __func__,
gpio_get_value(mdm_drv->ap2mdm_status_gpio));
}
static void mdm_peripheral_disconnect(struct mdm_modem_drv *mdm_drv)
{
pr_err("%s\n", __func__);
mutex_lock(&hsic_status_lock);
if (!hsic_peripheral_status)
goto out;
if (mdm_drv->pdata->peripheral_platform_device)
platform_device_del(mdm_drv->pdata->peripheral_platform_device);
hsic_peripheral_status = 0;
out:
mutex_unlock(&hsic_status_lock);
pr_err("%s : ap2mdm_status = %d\n", __func__,
gpio_get_value(mdm_drv->ap2mdm_status_gpio));
}
static void power_on_mdm(struct mdm_modem_drv *mdm_drv)
{
power_on_count++;
pr_err("%s: power count %d\n", __func__, power_on_count);
/* this gpio will be used to indicate apq readiness,
* de-assert it now so that it can asserted later
*/
gpio_direction_output(mdm_drv->ap2mdm_wakeup_gpio, 0);
/* The second attempt to power-on the mdm is the first attempt
* from user space, but we're already powered on. Ignore this.
* Subsequent attempts are from SSR or if something failed, in
* which case we must always reset the modem.
*/
if (power_on_count == 2)
return;
mdm_peripheral_disconnect(mdm_drv);
/* Pull RESET gpio low and wait for it to settle. */
pr_info("Pulling RESET gpio low\n");
gpio_direction_output(mdm_drv->ap2mdm_pmic_reset_n_gpio, 0);
usleep_range(5000, 10000);
/* Deassert RESET first and wait for ir to settle. */
pr_info("%s: Pulling RESET gpio high\n", __func__);
gpio_direction_output(mdm_drv->ap2mdm_pmic_reset_n_gpio, 1);
msleep(20);
/* Pull PWR gpio high and wait for it to settle, but only
* the first time the mdm is powered up.
* Some targets do not use ap2mdm_kpdpwr_n_gpio.
*/
if (power_on_count == 1) {
if (mdm_drv->ap2mdm_kpdpwr_n_gpio > 0) {
pr_debug("%s: Powering on mdm modem\n", __func__);
gpio_direction_output(mdm_drv->ap2mdm_kpdpwr_n_gpio, 1);
usleep_range(1000, 1000);
}
}
#ifdef CONFIG_ARCH_EXYNOS
gpio_direction_output(mdm_drv->ap2mdm_status_gpio, 1);
#endif
mdm_peripheral_connect(mdm_drv);
msleep(200);
}
static void power_down_mdm(struct mdm_modem_drv *mdm_drv)
{
int i;
pr_err("%s\n", __func__);
for (i = MDM_MODEM_TIMEOUT; i > 0; i -= MDM_MODEM_DELTA) {
/* pet_watchdog(); */
msleep(MDM_MODEM_DELTA);
if (gpio_get_value(mdm_drv->mdm2ap_status_gpio) == 0)
break;
}
if (i <= 0) {
pr_err("%s: MDM2AP_STATUS never went low.\n",
__func__);
gpio_direction_output(mdm_drv->ap2mdm_pmic_reset_n_gpio, 0);
for (i = MDM_HOLD_TIME; i > 0; i -= MDM_MODEM_DELTA) {
/* pet_watchdog(); */
msleep(MDM_MODEM_DELTA);
}
}
if (mdm_drv->ap2mdm_kpdpwr_n_gpio > 0)
gpio_direction_output(mdm_drv->ap2mdm_kpdpwr_n_gpio, 0);
mdm_peripheral_disconnect(mdm_drv);
}
#ifdef CONFIG_ARCH_EXYNOS
static void normal_boot_done(struct mdm_modem_drv *mdm_drv)
{
pr_err("%s\n", __func__);
mdm_peripheral_disconnect(mdm_drv);
}
#endif
static void debug_state_changed(int value)
{
mdm_debug_on = value;
}
static void mdm_status_changed(struct mdm_modem_drv *mdm_drv, int value)
{
pr_debug("%s: value:%d\n", __func__, value);
pr_err("%s: ap2mdm_status = %d\n", __func__,
gpio_get_value(mdm_drv->ap2mdm_status_gpio));
if (value) {
mdm_peripheral_disconnect(mdm_drv);
mdm_peripheral_connect(mdm_drv);
gpio_direction_output(mdm_drv->ap2mdm_wakeup_gpio, 1);
}
}
static struct mdm_ops mdm_cb = {
.power_on_mdm_cb = power_on_mdm,
.power_down_mdm_cb = power_down_mdm,
.debug_state_changed_cb = debug_state_changed,
.status_cb = mdm_status_changed,
#ifdef CONFIG_ARCH_EXYNOS
.normal_boot_done_cb = normal_boot_done,
#endif
};
/* temprary wakelock, remove when L3 state implemented */
#ifdef CONFIG_ARCH_EXYNOS
static struct wake_lock mdm_wake;
#endif
static int __init mdm_modem_probe(struct platform_device *pdev)
{
pr_err("%s\n", __func__);
/* temprary wakelock, remove when L3 state implemented */
#ifdef CONFIG_ARCH_EXYNOS
wake_lock_init(&mdm_wake, WAKE_LOCK_SUSPEND, "mdm_wake");
wake_lock(&mdm_wake);
#endif
return mdm_common_create(pdev, &mdm_cb);
}
static int __devexit mdm_modem_remove(struct platform_device *pdev)
{
return mdm_common_modem_remove(pdev);
}
static void mdm_modem_shutdown(struct platform_device *pdev)
{
mdm_common_modem_shutdown(pdev);
}
static struct platform_driver mdm_modem_driver = {
.remove = mdm_modem_remove,
.shutdown = mdm_modem_shutdown,
.driver = {
.name = "mdm2_modem",
.owner = THIS_MODULE
},
};
static int __init mdm_modem_init(void)
{
return platform_driver_probe(&mdm_modem_driver, mdm_modem_probe);
}
static void __exit mdm_modem_exit(void)
{
platform_driver_unregister(&mdm_modem_driver);
}
late_initcall(mdm_modem_init);
/* module_init(mdm_modem_init); */
module_exit(mdm_modem_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("mdm modem driver");
MODULE_VERSION("2.0");
MODULE_ALIAS("mdm_modem");
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