hwmon: (pmbus) Support for TI UCD90xxx series Sequencer and System Health Controllers

Hardware monitoring support for TI UCD90120, UCD90124, UCD9090, and UCD90910 Sequencer and System Health Controllers. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Tom Grennan <tom.grennan@ericsson.com>

hwmon: (pmbus) Support for TI UCD90xxx series Sequencer and System Health Controllers
Hardware monitoring support for TI UCD90120, UCD90124, UCD9090, and UCD90910 Sequencer and System Health Controllers. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Tom Grennan <tom.grennan@ericsson.com>
Guenter Roeck
1 parent 84fc4585c1
Showing 4 changed files with 402 additions and 1 deletions Side-by-side Diff
Documentation/hwmon/ucd9000
drivers/hwmon/Kconfig
drivers/hwmon/Makefile
drivers/hwmon/ucd9000.c
+Kernel driver ucd9000
+=====================
+
+Supported chips:
+  * TI UCD90120, UCD90124, UCD9090, and UCD90910
+    Prefixes: 'ucd90120', 'ucd90124', 'ucd9090', 'ucd90910'
+    Addresses scanned: -
+    Datasheets:
+	http://focus.ti.com/lit/ds/symlink/ucd90120.pdf
+	http://focus.ti.com/lit/ds/symlink/ucd90124.pdf
+	http://focus.ti.com/lit/ds/symlink/ucd9090.pdf
+	http://focus.ti.com/lit/ds/symlink/ucd90910.pdf
+
+Author: Guenter Roeck <guenter.roeck@ericsson.com>
+
+
+Description
+-----------
+
+From datasheets:
+
+The UCD90120 Power Supply Sequencer and System Health Monitor monitors and
+sequences up to 12 independent voltage rails. The device integrates a 12-bit
+ADC with a 2.5V internal reference for monitoring up to 13 power supply voltage,
+current, or temperature inputs.
+
+The UCD90124 is a 12-rail PMBus/I2C addressable power-supply sequencer and
+system-health monitor. The device integrates a 12-bit ADC for monitoring up to
+13 power-supply voltage, current, or temperature inputs. Twenty-six GPIO pins
+can be used for power supply enables, power-on reset signals, external
+interrupts, cascading, or other system functions. Twelve of these pins offer PWM
+functionality. Using these pins, the UCD90124 offers support for fan control,
+margining, and general-purpose PWM functions.
+
+The UCD9090 is a 10-rail PMBus/I2C addressable power-supply sequencer and
+monitor. The device integrates a 12-bit ADC for monitoring up to 10 power-supply
+voltage inputs. Twenty-three GPIO pins can be used for power supply enables,
+power-on reset signals, external interrupts, cascading, or other system
+functions. Ten of these pins offer PWM functionality. Using these pins, the
+UCD9090 offers support for margining, and general-purpose PWM functions.
+
+The UCD90910 is a ten-rail I2C / PMBus addressable power-supply sequencer and
+system-health monitor. The device integrates a 12-bit ADC for monitoring up to
+13 power-supply voltage, current, or temperature inputs.
+
+This driver is a client driver to the core PMBus driver. Please see
+Documentation/hwmon/pmbus for details on PMBus client drivers.
+
+
+Usage Notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate the
+devices explicitly. Please see Documentation/i2c/instantiating-devices for
+details.
+
+
+Platform data support
+---------------------
+
+The driver supports standard PMBus driver platform data. Please see
+Documentation/hwmon/pmbus for details.
+
+
+Sysfs entries
+-------------
+
+The following attributes are supported. Limits are read-write; all other
+attributes are read-only.
+
+in[1-12]_label		"vout[1-12]".
+in[1-12]_input		Measured voltage. From READ_VOUT register.
+in[1-12]_min		Minumum Voltage. From VOUT_UV_WARN_LIMIT register.
+in[1-12]_max		Maximum voltage. From VOUT_OV_WARN_LIMIT register.
+in[1-12]_lcrit		Critical minumum Voltage. VOUT_UV_FAULT_LIMIT register.
+in[1-12]_crit		Critical maximum voltage. From VOUT_OV_FAULT_LIMIT register.
+in[1-12]_min_alarm	Voltage low alarm. From VOLTAGE_UV_WARNING status.
+in[1-12]_max_alarm	Voltage high alarm. From VOLTAGE_OV_WARNING status.
+in[1-12]_lcrit_alarm	Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
+in[1-12]_crit_alarm	Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
+
+curr[1-12]_label	"iout[1-12]".
+curr[1-12]_input	Measured current. From READ_IOUT register.
+curr[1-12]_max		Maximum current. From IOUT_OC_WARN_LIMIT register.
+curr[1-12]_lcrit	Critical minumum output current. From IOUT_UC_FAULT_LIMIT
+			register.
+curr[1-12]_crit		Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
+curr[1-12]_max_alarm	Current high alarm. From IOUT_OC_WARNING status.
+curr[1-12]_crit_alarm	Current critical high alarm. From IOUT_OC_FAULT status.
+
+			For each attribute index, either voltage or current is
+			reported, but not both. If voltage or current is
+			reported depends on the chip configuration.
+
+temp[1-2]_input		Measured temperatures. From READ_TEMPERATURE_1 and
+			READ_TEMPERATURE_2 registers.
+temp[1-2]_max		Maximum temperature. From OT_WARN_LIMIT register.
+temp[1-2]_crit		Critical high temperature. From OT_FAULT_LIMIT register.
+temp[1-2]_max_alarm	Temperature high alarm.
+temp[1-2]_crit_alarm	Temperature critical high alarm.
+
+fan[1-4]_input		Fan RPM.
+fan[1-4]_alarm		Fan alarm.
+fan[1-4]_fault		Fan fault.
+
+			Fan attributes are only available on chips supporting
+			fan control (UCD90124, UCD90910). Attribute files are
+			created only for enabled fans.
+			Note that even though UCD90910 supports up to 10 fans,
+			only up to four fans are currently supported.
@@ -857,12 +857,24 @@
 	  This driver can also be built as a module. If so, the module will
 	  be called max8688.
  
+config SENSORS_UCD9000
+	tristate "TI UCD90120, UCD90124, UCD9090, UCD90910"
+	default n
+	help
+	  If you say yes here you get hardware monitoring support for TI
+	  UCD90120, UCD90124, UCD9090, UCD90910 Sequencer and System Health
+	  Controllers.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called ucd9000.
+
 config SENSORS_UCD9200
 	tristate "TI UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, UCD9248"
 	default n
 	help
 	  If you say yes here you get hardware monitoring support for TI
-	  UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248.
+	  UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248
+	  Digital PWM System Controllers.
  
 	  This driver can also be built as a module. If so, the module will
 	  be called ucd9200.
@@ -123,6 +123,7 @@
 obj-$(CONFIG_SENSORS_MAX16064)	+= max16064.o
 obj-$(CONFIG_SENSORS_MAX34440)	+= max34440.o
 obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o
+obj-$(CONFIG_SENSORS_UCD9000)	+= ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)	+= ucd9200.o
  
 ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
+/*
+ * Hardware monitoring driver for UCD90xxx Sequencer and System Health
+ * Controller series
+ *
+ * Copyright (C) 2011 Ericsson AB.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/i2c/pmbus.h>
+#include "pmbus.h"
+
+enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };
+
+#define UCD9000_MONITOR_CONFIG		0xd5
+#define UCD9000_NUM_PAGES		0xd6
+#define UCD9000_FAN_CONFIG_INDEX	0xe7
+#define UCD9000_FAN_CONFIG		0xe8
+#define UCD9000_DEVICE_ID		0xfd
+
+#define UCD9000_MON_TYPE(x)	(((x) >> 5) & 0x07)
+#define UCD9000_MON_PAGE(x)	((x) & 0x0f)
+
+#define UCD9000_MON_VOLTAGE	1
+#define UCD9000_MON_TEMPERATURE	2
+#define UCD9000_MON_CURRENT	3
+#define UCD9000_MON_VOLTAGE_HW	4
+
+#define UCD9000_NUM_FAN		4
+
+struct ucd9000_data {
+	u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
+	struct pmbus_driver_info info;
+};
+#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
+
+static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
+{
+	int fan_config = 0;
+	struct ucd9000_data *data
+	  = to_ucd9000_data(pmbus_get_driver_info(client));
+
+	if (data->fan_data[fan][3] & 1)
+		fan_config |= PB_FAN_2_INSTALLED;   /* Use lower bit position */
+
+	/* Pulses/revolution */
+	fan_config |= (data->fan_data[fan][3] & 0x06) >> 1;
+
+	return fan_config;
+}
+
+static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+	int ret = 0;
+	int fan_config;
+
+	switch (reg) {
+	case PMBUS_FAN_CONFIG_12:
+		if (page)
+			return -EINVAL;
+
+		ret = ucd9000_get_fan_config(client, 0);
+		if (ret < 0)
+			return ret;
+		fan_config = ret << 4;
+		ret = ucd9000_get_fan_config(client, 1);
+		if (ret < 0)
+			return ret;
+		fan_config |= ret;
+		ret = fan_config;
+		break;
+	case PMBUS_FAN_CONFIG_34:
+		if (page)
+			return -EINVAL;
+
+		ret = ucd9000_get_fan_config(client, 2);
+		if (ret < 0)
+			return ret;
+		fan_config = ret << 4;
+		ret = ucd9000_get_fan_config(client, 3);
+		if (ret < 0)
+			return ret;
+		fan_config |= ret;
+		ret = fan_config;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static const struct i2c_device_id ucd9000_id[] = {
+	{"ucd9000", ucd9000},
+	{"ucd90120", ucd90120},
+	{"ucd90124", ucd90124},
+	{"ucd9090", ucd9090},
+	{"ucd90910", ucd90910},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ucd9000_id);
+
+static int ucd9000_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
+	struct ucd9000_data *data;
+	struct pmbus_driver_info *info;
+	const struct i2c_device_id *mid;
+	int i, ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_BYTE_DATA |
+				     I2C_FUNC_SMBUS_BLOCK_DATA))
+		return -ENODEV;
+
+	ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
+					block_buffer);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed to read device ID\n");
+		return ret;
+	}
+	block_buffer[ret] = '\0';
+	dev_info(&client->dev, "Device ID %s\n", block_buffer);
+
+	mid = NULL;
+	for (i = 0; i < ARRAY_SIZE(ucd9000_id); i++) {
+		mid = &ucd9000_id[i];
+		if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
+			break;
+	}
+	if (!mid || !strlen(mid->name)) {
+		dev_err(&client->dev, "Unsupported device\n");
+		return -ENODEV;
+	}
+
+	if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
+		dev_notice(&client->dev,
+			   "Device mismatch: Configured %s, detected %s\n",
+			   id->name, mid->name);
+
+	data = kzalloc(sizeof(struct ucd9000_data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	info = &data->info;
+
+	ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
+	if (ret < 0) {
+		dev_err(&client->dev,
+			"Failed to read number of active pages\n");
+		goto out;
+	}
+	info->pages = ret;
+	if (!info->pages) {
+		dev_err(&client->dev, "No pages configured\n");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	/* The internal temperature sensor is always active */
+	info->func[0] = PMBUS_HAVE_TEMP;
+
+	/* Everything else is configurable */
+	ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
+					block_buffer);
+	if (ret <= 0) {
+		dev_err(&client->dev, "Failed to read configuration data\n");
+		ret = -ENODEV;
+		goto out;
+	}
+	for (i = 0; i < ret; i++) {
+		int page = UCD9000_MON_PAGE(block_buffer[i]);
+
+		if (page >= info->pages)
+			continue;
+
+		switch (UCD9000_MON_TYPE(block_buffer[i])) {
+		case UCD9000_MON_VOLTAGE:
+		case UCD9000_MON_VOLTAGE_HW:
+			info->func[page] |= PMBUS_HAVE_VOUT
+			  | PMBUS_HAVE_STATUS_VOUT;
+			break;
+		case UCD9000_MON_TEMPERATURE:
+			info->func[page] |= PMBUS_HAVE_TEMP2
+			  | PMBUS_HAVE_STATUS_TEMP;
+			break;
+		case UCD9000_MON_CURRENT:
+			info->func[page] |= PMBUS_HAVE_IOUT
+			  | PMBUS_HAVE_STATUS_IOUT;
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* Fan configuration */
+	if (mid->driver_data == ucd90124) {
+		for (i = 0; i < UCD9000_NUM_FAN; i++) {
+			i2c_smbus_write_byte_data(client,
+						  UCD9000_FAN_CONFIG_INDEX, i);
+			ret = i2c_smbus_read_block_data(client,
+							UCD9000_FAN_CONFIG,
+							data->fan_data[i]);
+			if (ret < 0)
+				goto out;
+		}
+		i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
+
+		info->read_byte_data = ucd9000_read_byte_data;
+		info->func[0] |= PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12
+		  | PMBUS_HAVE_FAN34 | PMBUS_HAVE_STATUS_FAN34;
+	}
+
+	ret = pmbus_do_probe(client, mid, info);
+	if (ret < 0)
+		goto out;
+	return 0;
+
+out:
+	kfree(data);
+	return ret;
+}
+
+static int ucd9000_remove(struct i2c_client *client)
+{
+	int ret;
+	struct ucd9000_data *data;
+
+	data = to_ucd9000_data(pmbus_get_driver_info(client));
+	ret = pmbus_do_remove(client);
+	kfree(data);
+	return ret;
+}
+
+
+/* This is the driver that will be inserted */
+static struct i2c_driver ucd9000_driver = {
+	.driver = {
+		.name = "ucd9000",
+	},
+	.probe = ucd9000_probe,
+	.remove = ucd9000_remove,
+	.id_table = ucd9000_id,
+};
+
+static int __init ucd9000_init(void)
+{
+	return i2c_add_driver(&ucd9000_driver);
+}
+
+static void __exit ucd9000_exit(void)
+{
+	i2c_del_driver(&ucd9000_driver);
+}
+
+MODULE_AUTHOR("Guenter Roeck");
+MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
+MODULE_LICENSE("GPL");
+module_init(ucd9000_init);
+module_exit(ucd9000_exit);
	1	+Kernel driver ucd9000
	2	+=====================
	3	+
	4	+Supported chips:
	5	+ * TI UCD90120, UCD90124, UCD9090, and UCD90910
	6	+ Prefixes: 'ucd90120', 'ucd90124', 'ucd9090', 'ucd90910'
	7	+ Addresses scanned: -
	8	+ Datasheets:
	9	+ http://focus.ti.com/lit/ds/symlink/ucd90120.pdf
	10	+ http://focus.ti.com/lit/ds/symlink/ucd90124.pdf
	11	+ http://focus.ti.com/lit/ds/symlink/ucd9090.pdf
	12	+ http://focus.ti.com/lit/ds/symlink/ucd90910.pdf
	13	+
	14	+Author: Guenter Roeck <guenter.roeck@ericsson.com>
	15	+
	16	+
	17	+Description
	18	+-----------
	19	+
	20	+From datasheets:
	21	+
	22	+The UCD90120 Power Supply Sequencer and System Health Monitor monitors and
	23	+sequences up to 12 independent voltage rails. The device integrates a 12-bit
	24	+ADC with a 2.5V internal reference for monitoring up to 13 power supply voltage,
	25	+current, or temperature inputs.
	26	+
	27	+The UCD90124 is a 12-rail PMBus/I2C addressable power-supply sequencer and
	28	+system-health monitor. The device integrates a 12-bit ADC for monitoring up to
	29	+13 power-supply voltage, current, or temperature inputs. Twenty-six GPIO pins
	30	+can be used for power supply enables, power-on reset signals, external
	31	+interrupts, cascading, or other system functions. Twelve of these pins offer PWM
	32	+functionality. Using these pins, the UCD90124 offers support for fan control,
	33	+margining, and general-purpose PWM functions.
	34	+
	35	+The UCD9090 is a 10-rail PMBus/I2C addressable power-supply sequencer and
	36	+monitor. The device integrates a 12-bit ADC for monitoring up to 10 power-supply
	37	+voltage inputs. Twenty-three GPIO pins can be used for power supply enables,
	38	+power-on reset signals, external interrupts, cascading, or other system
	39	+functions. Ten of these pins offer PWM functionality. Using these pins, the
	40	+UCD9090 offers support for margining, and general-purpose PWM functions.
	41	+
	42	+The UCD90910 is a ten-rail I2C / PMBus addressable power-supply sequencer and
	43	+system-health monitor. The device integrates a 12-bit ADC for monitoring up to
	44	+13 power-supply voltage, current, or temperature inputs.
	45	+
	46	+This driver is a client driver to the core PMBus driver. Please see
	47	+Documentation/hwmon/pmbus for details on PMBus client drivers.
	48	+
	49	+
	50	+Usage Notes
	51	+-----------
	52	+
	53	+This driver does not auto-detect devices. You will have to instantiate the
	54	+devices explicitly. Please see Documentation/i2c/instantiating-devices for
	55	+details.
	56	+
	57	+
	58	+Platform data support
	59	+---------------------
	60	+
	61	+The driver supports standard PMBus driver platform data. Please see
	62	+Documentation/hwmon/pmbus for details.
	63	+
	64	+
	65	+Sysfs entries
	66	+-------------
	67	+
	68	+The following attributes are supported. Limits are read-write; all other
	69	+attributes are read-only.
	70	+
	71	+in[1-12]_label "vout[1-12]".
	72	+in[1-12]_input Measured voltage. From READ_VOUT register.
	73	+in[1-12]_min Minumum Voltage. From VOUT_UV_WARN_LIMIT register.
	74	+in[1-12]_max Maximum voltage. From VOUT_OV_WARN_LIMIT register.
	75	+in[1-12]_lcrit Critical minumum Voltage. VOUT_UV_FAULT_LIMIT register.
	76	+in[1-12]_crit Critical maximum voltage. From VOUT_OV_FAULT_LIMIT register.
	77	+in[1-12]_min_alarm Voltage low alarm. From VOLTAGE_UV_WARNING status.
	78	+in[1-12]_max_alarm Voltage high alarm. From VOLTAGE_OV_WARNING status.
	79	+in[1-12]_lcrit_alarm Voltage critical low alarm. From VOLTAGE_UV_FAULT status.
	80	+in[1-12]_crit_alarm Voltage critical high alarm. From VOLTAGE_OV_FAULT status.
	81	+
	82	+curr[1-12]_label "iout[1-12]".
	83	+curr[1-12]_input Measured current. From READ_IOUT register.
	84	+curr[1-12]_max Maximum current. From IOUT_OC_WARN_LIMIT register.
	85	+curr[1-12]_lcrit Critical minumum output current. From IOUT_UC_FAULT_LIMIT
	86	+ register.
	87	+curr[1-12]_crit Critical maximum current. From IOUT_OC_FAULT_LIMIT register.
	88	+curr[1-12]_max_alarm Current high alarm. From IOUT_OC_WARNING status.
	89	+curr[1-12]_crit_alarm Current critical high alarm. From IOUT_OC_FAULT status.
	90	+
	91	+ For each attribute index, either voltage or current is
	92	+ reported, but not both. If voltage or current is
	93	+ reported depends on the chip configuration.
	94	+
	95	+temp[1-2]_input Measured temperatures. From READ_TEMPERATURE_1 and
	96	+ READ_TEMPERATURE_2 registers.
	97	+temp[1-2]_max Maximum temperature. From OT_WARN_LIMIT register.
	98	+temp[1-2]_crit Critical high temperature. From OT_FAULT_LIMIT register.
	99	+temp[1-2]_max_alarm Temperature high alarm.
	100	+temp[1-2]_crit_alarm Temperature critical high alarm.
	101	+
	102	+fan[1-4]_input Fan RPM.
	103	+fan[1-4]_alarm Fan alarm.
	104	+fan[1-4]_fault Fan fault.
	105	+
	106	+ Fan attributes are only available on chips supporting
	107	+ fan control (UCD90124, UCD90910). Attribute files are
	108	+ created only for enabled fans.
	109	+ Note that even though UCD90910 supports up to 10 fans,
	110	+ only up to four fans are currently supported.
...	...	@@ -857,12 +857,24 @@
857	857	This driver can also be built as a module. If so, the module will
858	858	be called max8688.
859	859
	860	+config SENSORS_UCD9000
	861	+ tristate "TI UCD90120, UCD90124, UCD9090, UCD90910"
	862	+ default n
	863	+ help
	864	+ If you say yes here you get hardware monitoring support for TI
	865	+ UCD90120, UCD90124, UCD9090, UCD90910 Sequencer and System Health
	866	+ Controllers.
	867	+
	868	+ This driver can also be built as a module. If so, the module will
	869	+ be called ucd9000.
	870	+
860	871	config SENSORS_UCD9200
861	872	tristate "TI UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, UCD9248"
862	873	default n
863	874	help
864	875	If you say yes here you get hardware monitoring support for TI
865		- UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248.
	876	+ UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248
	877	+ Digital PWM System Controllers.
866	878
867	879	This driver can also be built as a module. If so, the module will
868	880	be called ucd9200.
...	...	@@ -123,6 +123,7 @@
123	123	obj-$(CONFIG_SENSORS_MAX16064) += max16064.o
124	124	obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
125	125	obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
	126	+obj-$(CONFIG_SENSORS_UCD9000) += ucd9000.o
126	127	obj-$(CONFIG_SENSORS_UCD9200) += ucd9200.o
127	128
128	129	ccflags-$(CONFIG_HWMON_DEBUG_CHIP) := -DDEBUG
	1	+/*
	2	+ * Hardware monitoring driver for UCD90xxx Sequencer and System Health
	3	+ * Controller series
	4	+ *
	5	+ * Copyright (C) 2011 Ericsson AB.
	6	+ *
	7	+ * This program is free software; you can redistribute it and/or modify
	8	+ * it under the terms of the GNU General Public License as published by
	9	+ * the Free Software Foundation; either version 2 of the License, or
	10	+ * (at your option) any later version.
	11	+ *
	12	+ * This program is distributed in the hope that it will be useful,
	13	+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	+ * GNU General Public License for more details.
	16	+ *
	17	+ * You should have received a copy of the GNU General Public License
	18	+ * along with this program; if not, write to the Free Software
	19	+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	+ */
	21	+
	22	+#include <linux/kernel.h>
	23	+#include <linux/module.h>
	24	+#include <linux/init.h>
	25	+#include <linux/err.h>
	26	+#include <linux/slab.h>
	27	+#include <linux/i2c.h>
	28	+#include <linux/i2c/pmbus.h>
	29	+#include "pmbus.h"
	30	+
	31	+enum chips { ucd9000, ucd90120, ucd90124, ucd9090, ucd90910 };
	32	+
	33	+#define UCD9000_MONITOR_CONFIG 0xd5
	34	+#define UCD9000_NUM_PAGES 0xd6
	35	+#define UCD9000_FAN_CONFIG_INDEX 0xe7
	36	+#define UCD9000_FAN_CONFIG 0xe8
	37	+#define UCD9000_DEVICE_ID 0xfd
	38	+
	39	+#define UCD9000_MON_TYPE(x) (((x) >> 5) & 0x07)
	40	+#define UCD9000_MON_PAGE(x) ((x) & 0x0f)
	41	+
	42	+#define UCD9000_MON_VOLTAGE 1
	43	+#define UCD9000_MON_TEMPERATURE 2
	44	+#define UCD9000_MON_CURRENT 3
	45	+#define UCD9000_MON_VOLTAGE_HW 4
	46	+
	47	+#define UCD9000_NUM_FAN 4
	48	+
	49	+struct ucd9000_data {
	50	+ u8 fan_data[UCD9000_NUM_FAN][I2C_SMBUS_BLOCK_MAX];
	51	+ struct pmbus_driver_info info;
	52	+};
	53	+#define to_ucd9000_data(_info) container_of(_info, struct ucd9000_data, info)
	54	+
	55	+static int ucd9000_get_fan_config(struct i2c_client *client, int fan)
	56	+{
	57	+ int fan_config = 0;
	58	+ struct ucd9000_data *data
	59	+ = to_ucd9000_data(pmbus_get_driver_info(client));
	60	+
	61	+ if (data->fan_data[fan][3] & 1)
	62	+ fan_config \|= PB_FAN_2_INSTALLED; /* Use lower bit position */
	63	+
	64	+ /* Pulses/revolution */
	65	+ fan_config \|= (data->fan_data[fan][3] & 0x06) >> 1;
	66	+
	67	+ return fan_config;
	68	+}
	69	+
	70	+static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
	71	+{
	72	+ int ret = 0;
	73	+ int fan_config;
	74	+
	75	+ switch (reg) {
	76	+ case PMBUS_FAN_CONFIG_12:
	77	+ if (page)
	78	+ return -EINVAL;
	79	+
	80	+ ret = ucd9000_get_fan_config(client, 0);
	81	+ if (ret < 0)
	82	+ return ret;
	83	+ fan_config = ret << 4;
	84	+ ret = ucd9000_get_fan_config(client, 1);
	85	+ if (ret < 0)
	86	+ return ret;
	87	+ fan_config \|= ret;
	88	+ ret = fan_config;
	89	+ break;
	90	+ case PMBUS_FAN_CONFIG_34:
	91	+ if (page)
	92	+ return -EINVAL;
	93	+
	94	+ ret = ucd9000_get_fan_config(client, 2);
	95	+ if (ret < 0)
	96	+ return ret;
	97	+ fan_config = ret << 4;
	98	+ ret = ucd9000_get_fan_config(client, 3);
	99	+ if (ret < 0)
	100	+ return ret;
	101	+ fan_config \|= ret;
	102	+ ret = fan_config;
	103	+ break;
	104	+ default:
	105	+ ret = -ENODATA;
	106	+ break;
	107	+ }
	108	+ return ret;
	109	+}
	110	+
	111	+static const struct i2c_device_id ucd9000_id[] = {
	112	+ {"ucd9000", ucd9000},
	113	+ {"ucd90120", ucd90120},
	114	+ {"ucd90124", ucd90124},
	115	+ {"ucd9090", ucd9090},
	116	+ {"ucd90910", ucd90910},
	117	+ {}
	118	+};
	119	+MODULE_DEVICE_TABLE(i2c, ucd9000_id);
	120	+
	121	+static int ucd9000_probe(struct i2c_client *client,
	122	+ const struct i2c_device_id *id)
	123	+{
	124	+ u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
	125	+ struct ucd9000_data *data;
	126	+ struct pmbus_driver_info *info;
	127	+ const struct i2c_device_id *mid;
	128	+ int i, ret;
	129	+
	130	+ if (!i2c_check_functionality(client->adapter,
	131	+ I2C_FUNC_SMBUS_BYTE_DATA \|
	132	+ I2C_FUNC_SMBUS_BLOCK_DATA))
	133	+ return -ENODEV;
	134	+
	135	+ ret = i2c_smbus_read_block_data(client, UCD9000_DEVICE_ID,
	136	+ block_buffer);
	137	+ if (ret < 0) {
	138	+ dev_err(&client->dev, "Failed to read device ID\n");
	139	+ return ret;
	140	+ }
	141	+ block_buffer[ret] = '\0';
	142	+ dev_info(&client->dev, "Device ID %s\n", block_buffer);
	143	+
	144	+ mid = NULL;
	145	+ for (i = 0; i < ARRAY_SIZE(ucd9000_id); i++) {
	146	+ mid = &ucd9000_id[i];
	147	+ if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
	148	+ break;
	149	+ }
	150	+ if (!mid \|\| !strlen(mid->name)) {
	151	+ dev_err(&client->dev, "Unsupported device\n");
	152	+ return -ENODEV;
	153	+ }
	154	+
	155	+ if (id->driver_data != ucd9000 && id->driver_data != mid->driver_data)
	156	+ dev_notice(&client->dev,
	157	+ "Device mismatch: Configured %s, detected %s\n",
	158	+ id->name, mid->name);
	159	+
	160	+ data = kzalloc(sizeof(struct ucd9000_data), GFP_KERNEL);
	161	+ if (!data)
	162	+ return -ENOMEM;
	163	+ info = &data->info;
	164	+
	165	+ ret = i2c_smbus_read_byte_data(client, UCD9000_NUM_PAGES);
	166	+ if (ret < 0) {
	167	+ dev_err(&client->dev,
	168	+ "Failed to read number of active pages\n");
	169	+ goto out;
	170	+ }
	171	+ info->pages = ret;
	172	+ if (!info->pages) {
	173	+ dev_err(&client->dev, "No pages configured\n");
	174	+ ret = -ENODEV;
	175	+ goto out;
	176	+ }
	177	+
	178	+ /* The internal temperature sensor is always active */
	179	+ info->func[0] = PMBUS_HAVE_TEMP;
	180	+
	181	+ /* Everything else is configurable */
	182	+ ret = i2c_smbus_read_block_data(client, UCD9000_MONITOR_CONFIG,
	183	+ block_buffer);
	184	+ if (ret <= 0) {
	185	+ dev_err(&client->dev, "Failed to read configuration data\n");
	186	+ ret = -ENODEV;
	187	+ goto out;
	188	+ }
	189	+ for (i = 0; i < ret; i++) {
	190	+ int page = UCD9000_MON_PAGE(block_buffer[i]);
	191	+
	192	+ if (page >= info->pages)
	193	+ continue;
	194	+
	195	+ switch (UCD9000_MON_TYPE(block_buffer[i])) {
	196	+ case UCD9000_MON_VOLTAGE:
	197	+ case UCD9000_MON_VOLTAGE_HW:
	198	+ info->func[page] \|= PMBUS_HAVE_VOUT
	199	+ \| PMBUS_HAVE_STATUS_VOUT;
	200	+ break;
	201	+ case UCD9000_MON_TEMPERATURE:
	202	+ info->func[page] \|= PMBUS_HAVE_TEMP2
	203	+ \| PMBUS_HAVE_STATUS_TEMP;
	204	+ break;
	205	+ case UCD9000_MON_CURRENT:
	206	+ info->func[page] \|= PMBUS_HAVE_IOUT
	207	+ \| PMBUS_HAVE_STATUS_IOUT;
	208	+ break;
	209	+ default:
	210	+ break;
	211	+ }
	212	+ }
	213	+
	214	+ /* Fan configuration */
	215	+ if (mid->driver_data == ucd90124) {
	216	+ for (i = 0; i < UCD9000_NUM_FAN; i++) {
	217	+ i2c_smbus_write_byte_data(client,
	218	+ UCD9000_FAN_CONFIG_INDEX, i);
	219	+ ret = i2c_smbus_read_block_data(client,
	220	+ UCD9000_FAN_CONFIG,
	221	+ data->fan_data[i]);
	222	+ if (ret < 0)
	223	+ goto out;
	224	+ }
	225	+ i2c_smbus_write_byte_data(client, UCD9000_FAN_CONFIG_INDEX, 0);
	226	+
	227	+ info->read_byte_data = ucd9000_read_byte_data;
	228	+ info->func[0] \|= PMBUS_HAVE_FAN12 \| PMBUS_HAVE_STATUS_FAN12
	229	+ \| PMBUS_HAVE_FAN34 \| PMBUS_HAVE_STATUS_FAN34;
	230	+ }
	231	+
	232	+ ret = pmbus_do_probe(client, mid, info);
	233	+ if (ret < 0)
	234	+ goto out;
	235	+ return 0;
	236	+
	237	+out:
	238	+ kfree(data);
	239	+ return ret;
	240	+}
	241	+
	242	+static int ucd9000_remove(struct i2c_client *client)
	243	+{
	244	+ int ret;
	245	+ struct ucd9000_data *data;
	246	+
	247	+ data = to_ucd9000_data(pmbus_get_driver_info(client));
	248	+ ret = pmbus_do_remove(client);
	249	+ kfree(data);
	250	+ return ret;
	251	+}
	252	+
	253	+
	254	+/* This is the driver that will be inserted */
	255	+static struct i2c_driver ucd9000_driver = {
	256	+ .driver = {
	257	+ .name = "ucd9000",
	258	+ },
	259	+ .probe = ucd9000_probe,
	260	+ .remove = ucd9000_remove,
	261	+ .id_table = ucd9000_id,
	262	+};
	263	+
	264	+static int __init ucd9000_init(void)
	265	+{
	266	+ return i2c_add_driver(&ucd9000_driver);
	267	+}
	268	+
	269	+static void __exit ucd9000_exit(void)
	270	+{
	271	+ i2c_del_driver(&ucd9000_driver);
	272	+}
	273	+
	274	+MODULE_AUTHOR("Guenter Roeck");
	275	+MODULE_DESCRIPTION("PMBus driver for TI UCD90xxx");
	276	+MODULE_LICENSE("GPL");
	277	+module_init(ucd9000_init);
	278	+module_exit(ucd9000_exit);