hwmon: New driver for the Analog Devices ADM1029

Signed-off-by: Corentin Labbe <corentin.labbe@geomatys.fr>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

4 files changed, 526 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 93a338daedd8..0556a8de857c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -268,6 +268,12 @@ M:	khali@linux-fr.org
 L:      lm-sensors@lm-sensors.org
 S:      Maintained
 
+ADM1029 HARDWARE MONITOR DRIVER
+P:      Corentin Labbe
+M:      corentin.labbe@geomatys.fr
+L:      lm-sensors@lm-sensors.org
+S:      Maintained
+
 ADT746X FAN DRIVER
 P:      Colin Leroy
 M:      colin@colino.net
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 891ef6d0b1bf..c3d4856fb618 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -73,6 +73,17 @@ config SENSORS_ADM1026
           This driver can also be built as a module.  If so, the module
           will be called adm1026.
 
+config SENSORS_ADM1029
+        tristate "Analog Devices ADM1029"
+        depends on HWMON && I2C && EXPERIMENTAL
+        help
+          If you say yes here you get support for Analog Devices ADM1029
+          sensor chip.
+          Very rare chip, please let us know you use it.
+
+          This driver can also be built as a module.  If so, the module
+          will be called adm1029.
+
 config SENSORS_ADM1031
         tristate "Analog Devices ADM1031 and compatibles"
         depends on HWMON && I2C && EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 31661124271e..4165c27a2f25 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_SENSORS_ABITUGURU)	+= abituguru.o
 obj-$(CONFIG_SENSORS_ADM1021)   += adm1021.o
 obj-$(CONFIG_SENSORS_ADM1025)   += adm1025.o
 obj-$(CONFIG_SENSORS_ADM1026)   += adm1026.o
+obj-$(CONFIG_SENSORS_ADM1029)   += adm1029.o
 obj-$(CONFIG_SENSORS_ADM1031)   += adm1031.o
 obj-$(CONFIG_SENSORS_ADM9240)   += adm9240.o
 obj-$(CONFIG_SENSORS_AMS)       += ams/
diff --git a/drivers/hwmon/adm1029.c b/drivers/hwmon/adm1029.c
new file mode 100644
index 000000000000..73ce31b31511
--- /dev/null
+++ b/drivers/hwmon/adm1029.c
@@ -0,0 +1,508 @@
+/*
+ * adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
+ *
+ * Copyright (C) 2006 Corentin LABBE <corentin.labbe@geomatys.fr>
+ *
+ * Based on LM83 Driver by Jean Delvare <khali@linux-fr.org>
+ *
+ * Give only processor, motherboard temperatures and fan tachs
+ * Very rare chip please let me know if you use it
+ *
+ * http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
+ *
+ *
+ * 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 version 2 of the License
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/hwmon.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+/*
+ * Addresses to scan
+ */
+
+static unsigned short normal_i2c[] = {
+        0x28, 0x29, 0x2a,
+        0x2b, 0x2c, 0x2d,
+        0x2e, 0x2f, I2C_CLIENT_END
+};
+
+/*
+ * Insmod parameters
+ */
+
+I2C_CLIENT_INSMOD_1(adm1029);
+
+/*
+ * The ADM1029 registers
+ * Manufacturer ID is 0x41 for Analog Devices
+ */
+
+#define ADM1029_REG_MAN_ID                      0x0D
+#define ADM1029_REG_CHIP_ID                     0x0E
+#define ADM1029_REG_CONFIG                      0x01
+#define ADM1029_REG_NB_FAN_SUPPORT              0x02
+
+#define ADM1029_REG_TEMP_DEVICES_INSTALLED      0x06
+
+#define ADM1029_REG_LOCAL_TEMP                  0xA0
+#define ADM1029_REG_REMOTE1_TEMP                0xA1
+#define ADM1029_REG_REMOTE2_TEMP                0xA2
+
+#define ADM1029_REG_LOCAL_TEMP_HIGH             0x90
+#define ADM1029_REG_REMOTE1_TEMP_HIGH           0x91
+#define ADM1029_REG_REMOTE2_TEMP_HIGH           0x92
+
+#define ADM1029_REG_LOCAL_TEMP_LOW              0x98
+#define ADM1029_REG_REMOTE1_TEMP_LOW            0x99
+#define ADM1029_REG_REMOTE2_TEMP_LOW            0x9A
+
+#define ADM1029_REG_FAN1                        0x70
+#define ADM1029_REG_FAN2                        0x71
+
+#define ADM1029_REG_FAN1_MIN                    0x78
+#define ADM1029_REG_FAN2_MIN                    0x79
+
+#define ADM1029_REG_FAN1_CONFIG                 0x68
+#define ADM1029_REG_FAN2_CONFIG                 0x69
+
+#define TEMP_FROM_REG(val)      ((val) * 1000)
+
+#define DIV_FROM_REG(val)       ( 1 << (((val) >> 6) - 1))
+
+/* Registers to be checked by adm1029_update_device() */
+static const u8 ADM1029_REG_TEMP[] = {
+        ADM1029_REG_LOCAL_TEMP,
+        ADM1029_REG_REMOTE1_TEMP,
+        ADM1029_REG_REMOTE2_TEMP,
+        ADM1029_REG_LOCAL_TEMP_HIGH,
+        ADM1029_REG_REMOTE1_TEMP_HIGH,
+        ADM1029_REG_REMOTE2_TEMP_HIGH,
+        ADM1029_REG_LOCAL_TEMP_LOW,
+        ADM1029_REG_REMOTE1_TEMP_LOW,
+        ADM1029_REG_REMOTE2_TEMP_LOW,
+};
+
+static const u8 ADM1029_REG_FAN[] = {
+        ADM1029_REG_FAN1,
+        ADM1029_REG_FAN2,
+        ADM1029_REG_FAN1_MIN,
+        ADM1029_REG_FAN2_MIN,
+};
+
+static const u8 ADM1029_REG_FAN_DIV[] = {
+        ADM1029_REG_FAN1_CONFIG,
+        ADM1029_REG_FAN2_CONFIG,
+};
+
+/*
+ * Functions declaration
+ */
+
+static int adm1029_attach_adapter(struct i2c_adapter *adapter);
+static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind);
+static int adm1029_detach_client(struct i2c_client *client);
+static struct adm1029_data *adm1029_update_device(struct device *dev);
+static int adm1029_init_client(struct i2c_client *client);
+
+/*
+ * Driver data (common to all clients)
+ */
+
+static struct i2c_driver adm1029_driver = {
+        .driver = {
+                .name = "adm1029",
+        },
+        .attach_adapter = adm1029_attach_adapter,
+        .detach_client = adm1029_detach_client,
+};
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct adm1029_data {
+        struct i2c_client client;
+        struct class_device *class_dev;
+        struct mutex update_lock;
+        char valid;             /* zero until following fields are valid */
+        unsigned long last_updated;     /* in jiffies */
+
+        /* registers values, signed for temperature, unsigned for other stuff */
+        s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
+        u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
+        u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
+};
+
+/*
+ * Sysfs stuff
+ */
+
+static ssize_t
+show_temp(struct device *dev, struct device_attribute *devattr, char *buf)
+{
+        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+        struct adm1029_data *data = adm1029_update_device(dev);
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
+}
+
+static ssize_t
+show_fan(struct device *dev, struct device_attribute *devattr, char *buf)
+{
+        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+        struct adm1029_data *data = adm1029_update_device(dev);
+        u16 val;
+        if (data->fan[attr->index] == 0 || data->fan_div[attr->index] == 0
+            || data->fan[attr->index] == 255) {
+                return sprintf(buf, "0\n");
+        }
+
+        val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
+            / data->fan[attr->index];
+        return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t
+show_fan_div(struct device *dev, struct device_attribute *devattr, char *buf)
+{
+        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+        struct adm1029_data *data = adm1029_update_device(dev);
+        if (data->fan_div[attr->index] == 0)
+                return sprintf(buf, "0\n");
+        return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
+}
+
+static ssize_t set_fan_div(struct device *dev,
+            struct device_attribute *devattr, const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct adm1029_data *data = i2c_get_clientdata(client);
+        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+        long val = simple_strtol(buf, NULL, 10);
+        u8 reg;
+
+        mutex_lock(&data->update_lock);
+
+        /*Read actual config */
+        reg = i2c_smbus_read_byte_data(client,
+                                       ADM1029_REG_FAN_DIV[attr->index]);
+
+        switch (val) {
+        case 1:
+                val = 1;
+                break;
+        case 2:
+                val = 2;
+                break;
+        case 4:
+                val = 3;
+                break;
+        default:
+                mutex_unlock(&data->update_lock);
+                dev_err(&client->dev, "fan_div value %ld not "
+                        "supported. Choose one of 1, 2 or 4!\n", val);
+                return -EINVAL;
+        }
+        /* Update the value */
+        reg = (reg & 0x3F) | (val << 6);
+
+        /* Write value */
+        i2c_smbus_write_byte_data(client,
+                                  ADM1029_REG_FAN_DIV[attr->index], reg);
+        mutex_unlock(&data->update_lock);
+
+        return count;
+}
+
+/*
+Access rights on sysfs, S_IRUGO stand for Is Readable by User, Group and Others
+                        S_IWUSR stand for Is Writable by User
+*/
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
+static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
+
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp, NULL, 4);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp, NULL, 5);
+
+static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp, NULL, 6);
+static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp, NULL, 7);
+static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp, NULL, 8);
+
+static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
+static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
+
+static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO, show_fan, NULL, 2);
+static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO, show_fan, NULL, 3);
+
+static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
+                          show_fan_div, set_fan_div, 0);
+static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
+                          show_fan_div, set_fan_div, 1);
+
+static struct attribute *adm1029_attributes[] = {
+        &sensor_dev_attr_temp1_input.dev_attr.attr,
+        &sensor_dev_attr_temp1_min.dev_attr.attr,
+        &sensor_dev_attr_temp1_max.dev_attr.attr,
+        &sensor_dev_attr_temp2_input.dev_attr.attr,
+        &sensor_dev_attr_temp2_min.dev_attr.attr,
+        &sensor_dev_attr_temp2_max.dev_attr.attr,
+        &sensor_dev_attr_temp3_input.dev_attr.attr,
+        &sensor_dev_attr_temp3_min.dev_attr.attr,
+        &sensor_dev_attr_temp3_max.dev_attr.attr,
+        &sensor_dev_attr_fan1_input.dev_attr.attr,
+        &sensor_dev_attr_fan2_input.dev_attr.attr,
+        &sensor_dev_attr_fan1_min.dev_attr.attr,
+        &sensor_dev_attr_fan2_min.dev_attr.attr,
+        &sensor_dev_attr_fan1_div.dev_attr.attr,
+        &sensor_dev_attr_fan2_div.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group adm1029_group = {
+        .attrs = adm1029_attributes,
+};
+
+/*
+ * Real code
+ */
+
+static int adm1029_attach_adapter(struct i2c_adapter *adapter)
+{
+        if (!(adapter->class & I2C_CLASS_HWMON))
+                return 0;
+        return i2c_probe(adapter, &addr_data, adm1029_detect);
+}
+
+/*
+ * The following function does more than just detection. If detection
+ * succeeds, it also registers the new chip.
+ */
+
+static int adm1029_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+        struct i2c_client *client;
+        struct adm1029_data *data;
+        int err = 0;
+        const char *name = "";
+        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                goto exit;
+
+        if (!(data = kzalloc(sizeof(struct adm1029_data), GFP_KERNEL))) {
+                err = -ENOMEM;
+                goto exit;
+        }
+
+        client = &data->client;
+        i2c_set_clientdata(client, data);
+        client->addr = address;
+        client->adapter = adapter;
+        client->driver = &adm1029_driver;
+
+        /* Now we do the detection and identification. A negative kind
+         * means that the driver was loaded with no force parameter
+         * (default), so we must both detect and identify the chip
+         * (actually there is only one possible kind of chip for now, adm1029).
+         * A zero kind means that the driver was loaded with the force
+         * parameter, the detection step shall be skipped. A positive kind
+         * means that the driver was loaded with the force parameter and a
+         * given kind of chip is requested, so both the detection and the
+         * identification steps are skipped. */
+
+        /* Default to an adm1029 if forced */
+        if (kind == 0)
+                kind = adm1029;
+
+        /* ADM1029 doesn't have CHIP ID, check just MAN ID
+         * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
+         * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
+         * documented
+         */
+
+        if (kind <= 0) {        /* identification */
+                u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
+
+                man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
+                chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
+                temp_devices_installed = i2c_smbus_read_byte_data(client,
+                                        ADM1029_REG_TEMP_DEVICES_INSTALLED);
+                nb_fan_support = i2c_smbus_read_byte_data(client,
+                                                ADM1029_REG_NB_FAN_SUPPORT);
+                /* 0x41 is Analog Devices */
+                if (man_id == 0x41 && (temp_devices_installed & 0xf9) == 0x01
+                    && nb_fan_support == 0x03) {
+                        if ((chip_id & 0xF0) == 0x00) {
+                                kind = adm1029;
+                        } else {
+                                /* There are no "official" CHIP ID, so actually
+                                 * we use Major/Minor revision for that */
+                                printk(KERN_INFO
+                                       "adm1029: Unknown major revision %x, "
+                                       "please let us know\n", chip_id);
+                        }
+                }
+
+                if (kind <= 0) {        /* identification failed */
+                        pr_debug("adm1029: Unsupported chip (man_id=0x%02X, "
+                                 "chip_id=0x%02X)\n", man_id, chip_id);
+                        goto exit_free;
+                }
+        }
+
+        if (kind == adm1029) {
+                name = "adm1029";
+        }
+
+        /* We can fill in the remaining client fields */
+        strlcpy(client->name, name, I2C_NAME_SIZE);
+        mutex_init(&data->update_lock);
+
+        /* Tell the I2C layer a new client has arrived */
+        if ((err = i2c_attach_client(client)))
+                goto exit_free;
+
+        /*
+         * Initialize the ADM1029 chip
+         * Check config register
+         */
+        if (adm1029_init_client(client) == 0)
+                goto exit_detach;
+
+        /* Register sysfs hooks */
+        if ((err = sysfs_create_group(&client->dev.kobj, &adm1029_group)))
+                goto exit_detach;
+
+        data->class_dev = hwmon_device_register(&client->dev);
+        if (IS_ERR(data->class_dev)) {
+                err = PTR_ERR(data->class_dev);
+                goto exit_remove_files;
+        }
+
+        return 0;
+
+ exit_remove_files:
+        sysfs_remove_group(&client->dev.kobj, &adm1029_group);
+ exit_detach:
+        i2c_detach_client(client);
+ exit_free:
+        kfree(data);
+ exit:
+        return err;
+}
+
+static int adm1029_init_client(struct i2c_client *client)
+{
+        u8 config;
+        config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
+        if ((config & 0x10) == 0) {
+                i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
+                                          config | 0x10);
+        }
+        /* recheck config */
+        config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
+        if ((config & 0x10) == 0) {
+                dev_err(&client->dev, "Initialization failed!\n");
+                return 0;
+        }
+        return 1;
+}
+
+static int adm1029_detach_client(struct i2c_client *client)
+{
+        struct adm1029_data *data = i2c_get_clientdata(client);
+        int err;
+
+        hwmon_device_unregister(data->class_dev);
+        sysfs_remove_group(&client->dev.kobj, &adm1029_group);
+
+        if ((err = i2c_detach_client(client)))
+                return err;
+
+        kfree(data);
+        return 0;
+}
+
+/*
+function that update the status of the chips (temperature for exemple)
+*/
+static struct adm1029_data *adm1029_update_device(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct adm1029_data *data = i2c_get_clientdata(client);
+
+        mutex_lock(&data->update_lock);
+        /*
+         * Use the "cache" Luke, don't recheck values
+         * if there are already checked not a long time later
+         */
+        if (time_after(jiffies, data->last_updated + HZ * 2)
+         || !data->valid) {
+                int nr;
+
+                dev_dbg(&client->dev, "Updating adm1029 data\n");
+
+                for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
+                        data->temp[nr] =
+                            i2c_smbus_read_byte_data(client,
+                                                     ADM1029_REG_TEMP[nr]);
+                }
+                for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
+                        data->fan[nr] =
+                            i2c_smbus_read_byte_data(client,
+                                                     ADM1029_REG_FAN[nr]);
+                }
+                for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
+                        data->fan_div[nr] =
+                            i2c_smbus_read_byte_data(client,
+                                                     ADM1029_REG_FAN_DIV[nr]);
+                }
+
+                data->last_updated = jiffies;
+                data->valid = 1;
+        }
+
+        mutex_unlock(&data->update_lock);
+
+        return data;
+}
+
+/*
+        Common module stuff
+*/
+static int __init sensors_adm1029_init(void)
+{
+
+        return i2c_add_driver(&adm1029_driver);
+}
+
+static void __exit sensors_adm1029_exit(void)
+{
+
+        i2c_del_driver(&adm1029_driver);
+}
+
+MODULE_AUTHOR("Corentin LABBE <corentin.labbe@geomatys.fr>");
+MODULE_DESCRIPTION("adm1029 driver");
+MODULE_LICENSE("GPL v2");
+
+module_init(sensors_adm1029_init);
+module_exit(sensors_adm1029_exit);