Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932389Ab2KWDEl (ORCPT ); Thu, 22 Nov 2012 22:04:41 -0500 Received: from mga02.intel.com ([134.134.136.20]:55190 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757489Ab2KWDEj (ORCPT ); Thu, 22 Nov 2012 22:04:39 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.83,304,1352102400"; d="scan'208";a="246006945" Subject: [PATCH] serial: ifx6x60: Add modem power off function in the platform reboot process From: Jun Chen To: Alan Cox Cc: Jun Chen , Linux Kernel , "russ.gorby" , serial , Bi Chao Content-Type: text/plain; charset="UTF-8" Date: Fri, 23 Nov 2012 06:07:27 -0500 Message-ID: <1353668847.23300.13.camel@chenjun-workstation> Mime-Version: 1.0 X-Mailer: Evolution 2.32.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3495 Lines: 132 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 --- drivers/tty/serial/ifx6x60.c | 56 +++++++++++++++++++++++++++++++++++++++-- 1 files changed, 53 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c index 5b9bc19..f3c54e9 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 */ /** @@ -1219,6 +1249,9 @@ 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); } /* @@ -1354,7 +1387,9 @@ 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); } /** @@ -1389,16 +1424,31 @@ 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; } -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/