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Commit 9011e4a8 authored by Steve Twiss's avatar Steve Twiss Committed by Lee Jones
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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: default avatarSteve Twiss <stwiss.opensource@diasemi.com>
[Lee: Removed 'key_power' for Dmitry to take through the Input Tree]
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent e2ae0fbc

drivers/mfd/da9063-core.c

+54 −0
Original line number Diff line number Diff line
@@ -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;