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serial: ifx6x60: Add modem power off function in the platform reboot process 

This patch add modem power off function in the reboot process according registering
reboot callback to the reboot_notifier_list. Also realizing the spi shutdown function.

Signed-off-by: Bi Chao <chao.bi@intel.com>
Signed-off-by: Chen Jun <jun.d.chen@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jun Chen 2012-11-23 06:07:27 -05:00 committed by Greg Kroah-Hartman
parent d7ffb93290
commit 72d4724ea5
1 changed files with 53 additions and 3 deletions
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56
drivers/tty/serial/ifx6x60.c
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@ -60,6 +60,7 @@
#include <linux/pm_runtime.h>
#include <linux/spi/ifx_modem.h>
#include <linux/delay.h>
#include <linux/reboot.h>
#include "ifx6x60.h"
@ -72,8 +73,14 @@
#define IFX_SPI_HEADER_0 (-1)
#define IFX_SPI_HEADER_F (-2)
#define PO_POST_DELAY 200
#define IFX_MDM_RST_PMU 4
/* forward reference */
static void ifx_spi_handle_srdy(struct ifx_spi_device *ifx_dev);
static int ifx_modem_reboot_callback(struct notifier_block *nfb,
unsigned long event, void *data);
static int ifx_modem_power_off(struct ifx_spi_device *ifx_dev);
/* local variables */
static int spi_bpw = 16; /* 8, 16 or 32 bit word length */
@ -81,6 +88,29 @@ static struct tty_driver *tty_drv;
static struct ifx_spi_device *saved_ifx_dev;
static struct lock_class_key ifx_spi_key;
static struct notifier_block ifx_modem_reboot_notifier_block = {
.notifier_call = ifx_modem_reboot_callback,
};
static int ifx_modem_power_off(struct ifx_spi_device *ifx_dev)
{
gpio_set_value(IFX_MDM_RST_PMU, 1);
msleep(PO_POST_DELAY);
return 0;
}
static int ifx_modem_reboot_callback(struct notifier_block *nfb,
unsigned long event, void *data)
{
if (saved_ifx_dev)
ifx_modem_power_off(saved_ifx_dev);
else
pr_warn("no ifx modem active;\n");
return NOTIFY_OK;
}
/* GPIO/GPE settings */
/**
@ -1287,6 +1317,9 @@ static int ifx_spi_spi_remove(struct spi_device *spi)
static void ifx_spi_spi_shutdown(struct spi_device *spi)
{
struct ifx_spi_device *ifx_dev = spi_get_drvdata(spi);
ifx_modem_power_off(ifx_dev);
}
/*
@ -1422,7 +1455,9 @@ static void __exit ifx_spi_exit(void)
{
/* unregister */
tty_unregister_driver(tty_drv);
put_tty_driver(tty_drv);
spi_unregister_driver((void *)&ifx_spi_driver);
unregister_reboot_notifier(&ifx_modem_reboot_notifier_block);
}
/**
@ -1457,16 +1492,31 @@ static int __init ifx_spi_init(void)
if (result) {
pr_err("%s: tty_register_driver failed(%d)",
DRVNAME, result);
put_tty_driver(tty_drv);
return result;
goto err_free_tty;
}
result = spi_register_driver((void *)&ifx_spi_driver);
if (result) {
pr_err("%s: spi_register_driver failed(%d)",
DRVNAME, result);
tty_unregister_driver(tty_drv);
goto err_unreg_tty;
}
result = register_reboot_notifier(&ifx_modem_reboot_notifier_block);
if (result) {
pr_err("%s: register ifx modem reboot notifier failed(%d)",
DRVNAME, result);
goto err_unreg_spi;
}
return 0;
err_unreg_spi:
spi_unregister_driver((void *)&ifx_spi_driver);
err_unreg_tty:
tty_unregister_driver(tty_drv);
err_free_tty:
put_tty_driver(tty_drv);
return result;
}