abx500: hwmon: temperature monitor support for AB5500

Includes support for xtal temp, pcb temp and die temp
monitoring

ST-Ericsson Linux next: NA
ST-Ericsson ID: WP257616 & WP351655
ST-Ericsson FOSS-OUT ID: NA

Change-Id: I7668fb36df957b66929bfd13a4b6ad0386036aa1
Signed-off-by: Rajagopala V <rajagopala.v@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/28139
Reviewed-by: QATEST
Reviewed-by: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>

6 files changed, 225 insertions, 1 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 0d0f033852d..ecb19ff1a40 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -50,7 +50,19 @@ config SENSORS_AB8500
 	  used to access sensors outside the AB8500 chip.
 
 	  This driver can also be built as a module.  If so, the module
-	  will be called ab8500-temp.
+	  will be called abx500-temp.
+
+config SENSORS_AB5500
+	tristate "AB5500 thermal monitoring"
+	depends on AB5500_GPADC
+	default n
+	help
+	  If you say yes here you get support for the thermal sensor part
+	  of the AB5500 chip. The driver includes thermal management for
+	  AB5500 die, pcb and RF XTAL temperature.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called abx500-temp.
 
 config SENSORS_DB8500
 	tristate "DB8500 thermal monitoring"
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 1a2412487a6..39bdd768b24 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_SENSORS_W83781D)	+= w83781d.o
 obj-$(CONFIG_SENSORS_W83791D)	+= w83791d.o
 
 obj-$(CONFIG_SENSORS_AB8500)	+= abx500.o ab8500.o
+obj-$(CONFIG_SENSORS_AB5500)	+= abx500.o ab5500.o
 obj-$(CONFIG_SENSORS_DB8500)	+= db8500.o
 obj-$(CONFIG_SENSORS_ABITUGURU)	+= abituguru.o
 obj-$(CONFIG_SENSORS_ABITUGURU3)+= abituguru3.o
diff --git a/drivers/hwmon/ab5500.c b/drivers/hwmon/ab5500.c
new file mode 100644
index 00000000000..f229d103ec1
--- /dev/null
+++ b/drivers/hwmon/ab5500.c
@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ * Author: Martin Persson <martin.persson@stericsson.com> for
+ * ST-Ericsson.
+ * License terms: GNU Gereral Public License (GPL) version 2
+ *
+ * Note:
+ *
+ * If/when the AB5500 thermal warning temperature is reached (threshold
+ * 125C cannot be changed by SW), an interrupt is set and the driver
+ * notifies user space via a sysfs event. If a shut down is not
+ * triggered by user space and temperature reaches beyond critical
+ * limit(130C) pm_power off is called.
+ *
+ * If/when AB5500 thermal shutdown temperature is reached a hardware
+ * shutdown of the AB5500 will occur.
+ */
+
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/sysfs.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/abx500/ab5500-gpadc.h>
+#include "abx500.h"
+
+/* AB5500 driver monitors GPADC - XTAL_TEMP, PCB_TEMP,
+ * BTEMP_BALL, BAT_CTRL and DIE_TEMP
+ */
+#define NUM_MONITORED_SENSORS    5
+
+#define SHUTDOWN_AUTO_MIN_LIMIT                 -25
+#define SHUTDOWN_AUTO_MAX_LIMIT                 130
+
+static int ab5500_output_convert(int val, u8 sensor)
+{
+	int res = val;
+	/* GPADC returns die temperature in Celsius
+	 * convert it to millidegree celsius
+	 */
+	if (sensor == DIE_TEMP)
+		res = val * 1000;
+
+	return res;
+}
+
+static int ab5500_read_sensor(struct abx500_temp *data, u8 sensor)
+{
+	/*
+	 * TODO: Add support for BAT_CTRL node, since this
+	 * temperature measurement is more complex than just
+	 * an ADC readout
+	 */
+	int val = ab5500_gpadc_convert(data->ab5500_gpadc, sensor);
+	if (val < 0)
+		return val;
+	else
+		return ab5500_output_convert(val, sensor);
+}
+
+static ssize_t ab5500_show_name(struct device *dev,
+				struct device_attribute *devattr,
+				char *buf)
+{
+	return sprintf(buf, "ab5500\n");
+}
+
+static ssize_t ab5500_show_label(struct device *dev,
+				struct device_attribute *devattr,
+				char *buf)
+{
+	char *name;
+	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+	int index = attr->index;
+
+	/*
+	 * Make sure these labels correspond to the attribute indexes
+	 * used when calling SENSOR_DEVICE_ATRR.
+	 * Temperature sensors outside ab8500 (read via GPADC) are marked
+	 * with prefix ext_
+	 */
+	switch (index) {
+	case 1:
+		name = "xtal_temp";
+		break;
+	case 2:
+		name = "pcb_temp";
+		break;
+	case 3:
+		name = "bat_temp";
+		break;
+	case 4:
+		name = "bat_ctrl";
+		break;
+	case 5:
+		name = "ab5500";
+		break;
+	default:
+		return -EINVAL;
+	}
+	return sprintf(buf, "%s\n", name);
+}
+
+static int temp_shutdown_trig(int mux)
+{
+	pm_power_off();
+	return 0;
+}
+
+static int ab5500_temp_shutdown_auto(struct abx500_temp *data)
+{
+	int ret;
+	struct adc_auto_input *auto_ip;
+
+	auto_ip = kzalloc(sizeof(struct adc_auto_input), GFP_KERNEL);
+	if (!auto_ip) {
+		dev_err(&data->pdev->dev, "failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	auto_ip->mux = DIE_TEMP;
+	auto_ip->freq = MS500;
+	auto_ip->min = SHUTDOWN_AUTO_MIN_LIMIT;
+	auto_ip->max = SHUTDOWN_AUTO_MAX_LIMIT;
+	auto_ip->auto_adc_callback = temp_shutdown_trig;
+	data->gpadc_auto = auto_ip;
+	ret = ab5500_gpadc_convert_auto(data->ab5500_gpadc,
+					data->gpadc_auto);
+	if (ret < 0)
+		kfree(auto_ip);
+
+	return ret;
+}
+
+static int ab5500_temp_irq_handler(int irq, struct abx500_temp *data)
+{
+	/*
+	 * Make sure the magic numbers below corresponds to the node
+	 * used for AB5500 thermal warning from HW.
+	 */
+	mutex_lock(&data->lock);
+	data->crit_alarm[4] = 1;
+	mutex_unlock(&data->lock);
+	sysfs_notify(&data->pdev->dev.kobj, NULL, "temp5_crit_alarm");
+	dev_info(&data->pdev->dev, "ABX500 thermal warning,"
+				" power off system now!\n");
+	return 0;
+}
+
+int __init abx500_hwmon_init(struct abx500_temp *data)
+{
+	int err;
+
+	data->ab5500_gpadc = ab5500_gpadc_get("ab5500-adc.0");
+	if (IS_ERR(data->ab5500_gpadc))
+		return PTR_ERR(data->ab5500_gpadc);
+
+	err = ab5500_temp_shutdown_auto(data);
+	if (err < 0) {
+		dev_err(&data->pdev->dev, "Failed to register"
+				" auto trigger(%d)\n", err);
+		return err;
+	}
+
+	/*
+	 * Setup HW defined data.
+	 *
+	 * Reference hardware (HREF):
+	 *
+	 * XTAL_TEMP, PCB_TEMP, BTEMP_BALL refer to millivolts and
+	 * BAT_CTRL and DIE_TEMP refer to millidegrees
+	 *
+	 * Make sure indexes correspond to the attribute indexes
+	 * used when calling SENSOR_DEVICE_ATRR
+	 */
+	data->gpadc_addr[0] = XTAL_TEMP;
+	data->gpadc_addr[1] = PCB_TEMP;
+	data->gpadc_addr[2] = BTEMP_BALL;
+	data->gpadc_addr[3] = BAT_CTRL;
+	data->gpadc_addr[4] = DIE_TEMP;
+	data->monitored_sensors = NUM_MONITORED_SENSORS;
+
+	data->ops.read_sensor = ab5500_read_sensor;
+	data->ops.irq_handler = ab5500_temp_irq_handler;
+	data->ops.show_name  = ab5500_show_name;
+	data->ops.show_label = ab5500_show_label;
+
+	return 0;
+}
diff --git a/drivers/hwmon/abx500.c b/drivers/hwmon/abx500.c
index 9d522ef6f62..6666dc27065 100644
--- a/drivers/hwmon/abx500.c
+++ b/drivers/hwmon/abx500.c
@@ -623,6 +623,7 @@ exit_platform_data:
 	hwmon_device_unregister(data->hwmon_dev);
 	platform_set_drvdata(pdev, NULL);
 exit:
+	kfree(data->gpadc_auto);
 	kfree(data);
 	return err;
 }
@@ -635,6 +636,7 @@ static int __devexit abx500_temp_remove(struct platform_device *pdev)
 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);
 	platform_set_drvdata(pdev, NULL);
+	kfree(data->gpadc_auto);
 	kfree(data);
 	return 0;
 }
diff --git a/drivers/hwmon/abx500.h b/drivers/hwmon/abx500.h
index a089a63939d..1d41aa191fe 100644
--- a/drivers/hwmon/abx500.h
+++ b/drivers/hwmon/abx500.h
@@ -10,7 +10,9 @@
 #define NUM_SENSORS 5
 
 struct ab8500_gpadc;
+struct ab5500_gpadc;
 struct ab8500_btemp;
+struct adc_auto_input;
 struct abx500_temp;
 
 /**
@@ -34,7 +36,9 @@ struct abx500_temp_ops {
  * @pdev: platform device
  * @hwmon_dev: hwmon device
  * @ab8500_gpadc: gpadc interface for ab8500
+ * @ab5500_gpadc: gpadc interface for ab5500
  * @btemp: battery temperature interface for ab8500
+ * @adc_auto_input: gpadc auto trigger
  * @gpadc_addr: gpadc channel address
  * @temp: sensor temperature input value
  * @min: sensor temperature min value
@@ -57,7 +61,9 @@ struct abx500_temp {
 	struct platform_device *pdev;
 	struct device *hwmon_dev;
 	struct ab8500_gpadc *ab8500_gpadc;
+	struct ab5500_gpadc *ab5500_gpadc;
 	struct ab8500_btemp *ab8500_btemp;
+	struct adc_auto_input *gpadc_auto;
 	struct abx500_temp_ops ops;
 	u8 gpadc_addr[NUM_SENSORS];
 	unsigned long temp[NUM_SENSORS];
diff --git a/drivers/mfd/ab5500-core.c b/drivers/mfd/ab5500-core.c
index 54d0fe40845..75a4b05ad2e 100644
--- a/drivers/mfd/ab5500-core.c
+++ b/drivers/mfd/ab5500-core.c
@@ -991,6 +991,19 @@ static struct mfd_cell ab5500_devs[AB5500_NUM_DEVICES] = {
 			},
 		},
 	},
+	[AB5500_DEVID_TEMPMON] = {
+		.name = "abx500-temp",
+		.id = AB5500_DEVID_TEMPMON,
+		.num_resources = 1,
+		.resources = (struct resource[]) {
+			{
+				.name   = "ABX500_TEMP_WARM",
+				.flags  = IORESOURCE_IRQ,
+				.start  = AB5500_IRQ(2, 2),
+				.end    = AB5500_IRQ(2, 2),
+			},
+		},
+	},
 };
 
 /*