From: Jun Chen Date: Fri, 23 Nov 2012 11:07:27 +0000 (-0500) Subject: serial: ifx6x60: Add modem power off function in the platform reboot process X-Git-Tag: next-20121205~28^2~9 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=72d4724ea54c360115bca7979167850dfa37ec65;p=karo-tx-linux.git 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 Signed-off-by: Chen Jun Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c index 6356dba49e6c..675d94ab0aff 100644 --- a/drivers/tty/serial/ifx6x60.c +++ b/drivers/tty/serial/ifx6x60.c @@ -60,6 +60,7 @@ #include #include #include +#include #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; }