Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933588AbbELNjD (ORCPT ); Tue, 12 May 2015 09:39:03 -0400 Received: from mail1.bemta14.messagelabs.com ([193.109.254.118]:28906 "EHLO mail1.bemta14.messagelabs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932663AbbELNjA (ORCPT ); Tue, 12 May 2015 09:39:00 -0400 X-Env-Sender: stwiss.opensource@diasemi.com X-Msg-Ref: server-4.tower-193.messagelabs.com!1431437931!14062813!1 X-Originating-IP: [82.210.246.133] X-StarScan-Received: X-StarScan-Version: 6.13.14; banners=-,-,- X-VirusChecked: Checked Message-ID: <81dec245f0d1a3a0713e6e2966d2278e422208f2.1431437466.git.stwiss.opensource@diasemi.com> In-Reply-To: References: From: S Twiss Date: Tue, 12 May 2015 14:31:06 +0100 Subject: [PATCH V4 3/3] mfd: da9063: MFD support for OnKey driver To: Lee Jones , Samuel Ortiz , Steve Twiss CC: DT , David Dajun Chen , Dmitry Torokhov , INPUT , Ian Campbell , Kumar Gala , LKML , "Mark Rutland" , Pawel Moll , Rob Herring , Support Opensource MIME-Version: 1.0 Content-Type: text/plain X-EXCLAIMER-MD-CONFIG: 68589ee3-dc76-43d0-9079-ac9e3637ce03 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4662 Lines: 144 From: Steve Twiss Add MFD support for the DA9063 OnKey driver The function da9063_clear_fault_log() is added to mitigate the case of a hardware power-cut after a long-long OnKey press. Although there is no software intervention in this case (by definition) such a shutdown would cause persistent information within the DA9063 FAULT_LOG that would be available during the next device restart. Clearance of this persistent register must be completed after such a hardware power-cut operation has happened so that the FAULT_LOG does not continue with previous values. The clearance function has been added here in the kernel driver because wiping the fault-log cannot be counted on outside the Linux kernel. Signed-off-by: Steve Twiss --- Version History Changes in V4 - Additional description of MFD patch changes for FAULT_LOG in relation to the requirements of the OnKey driver. Please see a further explanation of the OnKey's operation in this thread: https://lkml.org/lkml/2015/4/29/406 Changes in V3 - The MFD code was originally in [PATCH V2 1/2]. This is now been moved into this patch [PATCH V3 3/3]. - Whitespace cleanup This patch applies against linux-next and v4.1-rc3 drivers/mfd/da9063-core.c | 54 ++++++++++++++++++++++++++++++++++++++++ include/linux/mfd/da9063/pdata.h | 1 + 2 files changed, 55 insertions(+) diff --git a/drivers/mfd/da9063-core.c b/drivers/mfd/da9063-core.c index facd361..af841c1 100644 --- a/drivers/mfd/da9063-core.c +++ b/drivers/mfd/da9063-core.c @@ -60,6 +60,7 @@ static struct resource da9063_rtc_resources[] = { static struct resource da9063_onkey_resources[] = { { + .name = "ONKEY", .start = DA9063_IRQ_ONKEY, .end = DA9063_IRQ_ONKEY, .flags = IORESOURCE_IRQ, @@ -97,6 +98,7 @@ static const struct mfd_cell da9063_devs[] = { .name = DA9063_DRVNAME_ONKEY, .num_resources = ARRAY_SIZE(da9063_onkey_resources), .resources = da9063_onkey_resources, + .of_compatible = "dlg,da9063-onkey", }, { .name = DA9063_DRVNAME_RTC, @@ -109,12 +111,64 @@ static const struct mfd_cell da9063_devs[] = { }, }; +static int da9063_clear_fault_log(struct da9063 *da9063) +{ + int ret = 0; + int fault_log = 0; + + ret = regmap_read(da9063->regmap, DA9063_REG_FAULT_LOG, &fault_log); + if (ret < 0) { + dev_err(da9063->dev, "Cannot read FAULT_LOG.\n"); + return -EIO; + } + + if (fault_log) { + if (fault_log & DA9063_TWD_ERROR) + dev_dbg(da9063->dev, + "Fault log entry detected: DA9063_TWD_ERROR\n"); + if (fault_log & DA9063_POR) + dev_dbg(da9063->dev, + "Fault log entry detected: DA9063_POR\n"); + if (fault_log & DA9063_VDD_FAULT) + dev_dbg(da9063->dev, + "Fault log entry detected: DA9063_VDD_FAULT\n"); + if (fault_log & DA9063_VDD_START) + dev_dbg(da9063->dev, + "Fault log entry detected: DA9063_VDD_START\n"); + if (fault_log & DA9063_TEMP_CRIT) + dev_dbg(da9063->dev, + "Fault log entry detected: DA9063_TEMP_CRIT\n"); + if (fault_log & DA9063_KEY_RESET) + dev_dbg(da9063->dev, + "Fault log entry detected: DA9063_KEY_RESET\n"); + if (fault_log & DA9063_NSHUTDOWN) + dev_dbg(da9063->dev, + "Fault log entry detected: DA9063_NSHUTDOWN\n"); + if (fault_log & DA9063_WAIT_SHUT) + dev_dbg(da9063->dev, + "Fault log entry detected: DA9063_WAIT_SHUT\n"); + } + + ret = regmap_write(da9063->regmap, + DA9063_REG_FAULT_LOG, + fault_log); + if (ret < 0) + dev_err(da9063->dev, + "Cannot reset FAULT_LOG values %d\n", ret); + + return ret; +} + int da9063_device_init(struct da9063 *da9063, unsigned int irq) { struct da9063_pdata *pdata = da9063->dev->platform_data; int model, variant_id, variant_code; int ret; + ret = da9063_clear_fault_log(da9063); + if (ret < 0) + dev_err(da9063->dev, "Cannot clear fault log\n"); + if (pdata) { da9063->flags = pdata->flags; da9063->irq_base = pdata->irq_base; diff --git a/include/linux/mfd/da9063/pdata.h b/include/linux/mfd/da9063/pdata.h index 95c8742..612383b 100644 --- a/include/linux/mfd/da9063/pdata.h +++ b/include/linux/mfd/da9063/pdata.h @@ -103,6 +103,7 @@ struct da9063; struct da9063_pdata { int (*init)(struct da9063 *da9063); int irq_base; + bool key_power; unsigned flags; struct da9063_regulators_pdata *regulators_pdata; struct led_platform_data *leds_pdata; -- end-of-patch for PATCH V4 -- 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/