mfd: ab5500-core: board turn on status

Read the interrupt registers during boot before clearing the interrupts
and save the reason as to why the board has booted.
Expose the same to user space via sysfs.

ST-Ericsson Linux next: NA
ST-Ericsson ID: 338529
ST-Ericsson FOSS-OUT ID: Trivial

Change-Id: Ie27c8a1d7b89dce1a5348109b12e29a0cdae7817
Signed-off-by: Arun Murthy <arun.murthy@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/27969
Reviewed-by: QATOOLS
Reviewed-by: Bibek BASU <bibek.basu@stericsson.com>
Reviewed-by: QATEST
Reviewed-by: Andrew LYNN <andrew.lynn@stericsson.com>

2 files changed, 105 insertions, 4 deletions

diff --git a/drivers/mfd/ab5500-core.c b/drivers/mfd/ab5500-core.c
index cf7de4d7443..91f6d25f6e9 100755
--- a/drivers/mfd/ab5500-core.c
+++ b/drivers/mfd/ab5500-core.c
@@ -51,6 +51,18 @@
 #define AB5500_CHIP_ID (0x20)
 #define AB5500_INTERRUPTS 0x01FFFFFF
 
+/* Turn On Status Event */
+#define RTC_ALARM		0x80
+#define POW_KEY_2_ON		0x20
+#define POW_KEY_1_ON		0x08
+#define POR_ON_VBAT		0x01
+#define VBUS_DET		0x02
+#define VBUS_CH_DROP_R		0x08
+#define USB_CH_DET_DONE		0x02
+
+/* Global Variables */
+u8 turn_on_stat = 0x00;
+
 /**
  * struct ab5500_bank
  * @slave_addr: I2C slave_addr found in AB5500 specification
@@ -794,6 +806,34 @@ static struct mfd_cell ab5500_devs[AB5500_NUM_DEVICES] = {
 	},
 };
 
+static ssize_t show_chip_id(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct ab5500 *ab5500;
+
+	ab5500 = dev_get_drvdata(dev);
+	return sprintf(buf, "%#x\n", ab5500 ? ab5500->chip_id : -EINVAL);
+}
+
+static ssize_t show_turn_on_status(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%#x\n", turn_on_stat);
+}
+
+static DEVICE_ATTR(chip_id, S_IRUGO, show_chip_id, NULL);
+static DEVICE_ATTR(turn_on_status, S_IRUGO, show_turn_on_status, NULL);
+
+static struct attribute *ab5500_sysfs_entries[] = {
+	&dev_attr_chip_id.attr,
+	&dev_attr_turn_on_status.attr,
+	NULL,
+};
+
+static struct attribute_group ab5500_attr_group = {
+	.attrs	= ab5500_sysfs_entries,
+};
+
 /*
  * Functionality for getting/setting register values.
  */
@@ -2357,6 +2397,7 @@ static int __init ab5500_probe(struct platform_device *pdev)
 	struct resource *res;
 	int err;
 	int i;
+	u8 val;
 
 	ab = kzalloc(sizeof(struct ab5500), GFP_KERNEL);
 	if (!ab) {
@@ -2413,11 +2454,52 @@ static int __init ab5500_probe(struct platform_device *pdev)
 		ab->num_event_reg = AB5500_NUM_IRQ_REGS;
 	else
 		ab->num_event_reg = AB5500_NUM_EVENT_V1_REG;
+
+	/* Read the latch regs to know the reason for turn on */
+	err = get_register_interruptible(ab, AB5500_BANK_IT,
+			AB5500_IT_LATCH0_REG + 1, &val);
+	if (err)
+		goto exit_no_detect;
+	if (val & RTC_ALARM) /* RTCAlarm */
+		turn_on_stat = RTC_ALARM_EVENT;
+	if (val & POW_KEY_2_ON) /* PonKey2dbR */
+		turn_on_stat |= P_ON_KEY2_EVENT;
+	if (val & POW_KEY_1_ON) /* PonKey1dbR */
+		turn_on_stat |= P_ON_KEY1_EVENT;
+
+	err = get_register_interruptible(ab, AB5500_BANK_IT,
+			AB5500_IT_LATCH0_REG + 2, &val);
+	if (err)
+		goto exit_no_detect;
+	if (val & POR_ON_VBAT)
+		/* PORnVbat */
+		turn_on_stat |= POR_ON_VBAT_EVENT ;
+	err = get_register_interruptible(ab, AB5500_BANK_IT,
+			AB5500_IT_LATCH0_REG + 8, &val);
+	if (err)
+		goto exit_no_detect;
+	if (val & VBUS_DET)
+		/* VbusDet */
+		turn_on_stat |= VBUS_DET_EVENT;
+	err = get_register_interruptible(ab, AB5500_BANK_IT,
+			AB5500_IT_LATCH0_REG + 18, &val);
+	if (err)
+		goto exit_no_detect;
+	if (val & VBUS_CH_DROP_R)
+		/* VBUSChDrop */
+		turn_on_stat |= VBUS_DET_EVENT;
+	err = get_register_interruptible(ab, AB5500_BANK_IT,
+			AB5500_IT_LATCH0_REG + 9, &val);
+	if (err)
+		goto exit_no_detect;
+	if (val & USB_CH_DET_DONE)
+		/* VBUSChDrop */
+		turn_on_stat |= VBUS_DET_EVENT;
+
 	/* Clear and mask all interrupts */
 	for (i = 0; i < ab->num_event_reg; i++) {
 		u8 latchreg = AB5500_IT_LATCH0_REG + i;
 		u8 maskreg = AB5500_IT_MASK0_REG + i;
-		u8 val;
 
 		get_register_interruptible(ab, AB5500_BANK_IT, latchreg, &val);
 		set_register_interruptible(ab, AB5500_BANK_IT, maskreg, 0xff);
@@ -2456,17 +2538,26 @@ static int __init ab5500_probe(struct platform_device *pdev)
 		ab5500_plf_data->irq.base);
 	if (err) {
 		dev_err(&pdev->dev, "ab5500_mfd_add_device error\n");
-		goto exit_no_irq;
+		goto exit_no_add_dev;
 	}
 	err = ab5500_setup(ab, ab5500_plf_data->init_settings,
 		ab5500_plf_data->init_settings_sz);
 	if (err) {
 		dev_err(&pdev->dev, "ab5500_setup error\n");
-		goto exit_no_irq;
+		goto exit_no_add_dev;
 	}
 	ab5500_setup_debugfs(ab);
-	return 0;
+	err = sysfs_create_group(&ab->dev->kobj, &ab5500_attr_group);
+	if (err) {
+		dev_err(&pdev->dev, "error creating sysfs entries\n");
+		goto exit_no_debugfs;
+	}
 
+	return 0;
+exit_no_debugfs:
+	ab5500_remove_debugfs();
+exit_no_add_dev:
+	mfd_remove_devices(&pdev->dev);
 exit_no_irq:
 	if (ab->irq_base) {
 		free_irq(ab->ab5500_irq, ab);
@@ -2486,6 +2577,7 @@ static int __exit ab5500_remove(struct platform_device *pdev)
 	 * At this point, all subscribers should have unregistered
 	 * their notifiers so deactivate IRQ
 	 */
+	sysfs_remove_group(&ab->dev->kobj, &ab5500_attr_group);
 	ab5500_remove_debugfs();
 	mfd_remove_devices(&pdev->dev);
 	if (ab->irq_base) {
diff --git a/include/linux/mfd/abx500.h b/include/linux/mfd/abx500.h
index cd2e36d0108..a0a1386774f 100644
--- a/include/linux/mfd/abx500.h
+++ b/include/linux/mfd/abx500.h
@@ -99,6 +99,15 @@
  */
 #define AB3100_NUM_REGULATORS				10
 
+/* Turn On Events */
+#define POR_ON_VBAT_EVENT		(0x01 << 0)
+#define P_ON_KEY1_EVENT			(0x01 << 1)
+#define P_ON_KEY2_EVENT			(0x01 << 2)
+#define RTC_ALARM_EVENT			(0x01 << 3)
+#define MAIN_CH_DET_EVENT		(0x01 << 4)
+#define VBUS_DET_EVENT			(0x01 << 5)
+#define USB_ID_DET_EVENT		(0x01 << 6)
+
 /**
  * struct ab3100
  * @access_mutex: lock out concurrent accesses to the AB3100 registers