diff options
| author | Steve Twiss <stwiss.opensource@diasemi.com> | 2015-05-19 11:32:45 +0100 |
|---|---|---|
| committer | Lee Jones <lee.jones@linaro.org> | 2015-06-22 12:25:20 +0100 |
| commit | 9011e4a8a6fe57f76511609930ed00d305389089 (patch) | |
| tree | 15c42a2f5e7fc9cbb05dc6db239d196b8f90dbd4 | |
| parent | e2ae0fbc738fa207cfb712657d339a1863c6bd3e (diff) | |
mfd: da9063: Add support for OnKey driver
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 <stwiss.opensource@diasemi.com>
[Lee: Removed 'key_power' for Dmitry to take through the Input Tree]
Signed-off-by: Lee Jones <lee.jones@linaro.org>
| -rw-r--r-- | drivers/mfd/da9063-core.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/mfd/da9063-core.c b/drivers/mfd/da9063-core.c index facd3610ac77..af841c165787 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; |