1 files changed, 408 insertions, 0 deletions

diff --git a/drivers/hwmon/lm83.c b/drivers/hwmon/lm83.c
new file mode 100644
index 000000000000..a49008b444c8
--- /dev/null
+++ b/drivers/hwmon/lm83.c
@@ -0,0 +1,408 @@
+/*
+ * lm83.c - Part of lm_sensors, Linux kernel modules for hardware
+ *          monitoring
+ * Copyright (C) 2003-2005  Jean Delvare <khali@linux-fr.org>
+ *
+ * Heavily inspired from the lm78, lm75 and adm1021 drivers. The LM83 is
+ * a sensor chip made by National Semiconductor. It reports up to four
+ * temperatures (its own plus up to three external ones) with a 1 deg
+ * resolution and a 3-4 deg accuracy. Complete datasheet can be obtained
+ * from National's website at:
+ *   http://www.national.com/pf/LM/LM83.html
+ * Since the datasheet omits to give the chip stepping code, I give it
+ * here: 0x03 (at register 0xff).
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/i2c-sensor.h>
+#include <linux/hwmon-sysfs.h>
+
+/*
+ * Addresses to scan
+ * Address is selected using 2 three-level pins, resulting in 9 possible
+ * addresses.
+ */
+
+static unsigned short normal_i2c[] = { 0x18, 0x19, 0x1a,
+                                        0x29, 0x2a, 0x2b,
+                                        0x4c, 0x4d, 0x4e,
+                                        I2C_CLIENT_END };
+static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
+
+/*
+ * Insmod parameters
+ */
+
+SENSORS_INSMOD_1(lm83);
+
+/*
+ * The LM83 registers
+ * Manufacturer ID is 0x01 for National Semiconductor.
+ */
+
+#define LM83_REG_R_MAN_ID               0xFE
+#define LM83_REG_R_CHIP_ID              0xFF
+#define LM83_REG_R_CONFIG               0x03
+#define LM83_REG_W_CONFIG               0x09
+#define LM83_REG_R_STATUS1              0x02
+#define LM83_REG_R_STATUS2              0x35
+#define LM83_REG_R_LOCAL_TEMP           0x00
+#define LM83_REG_R_LOCAL_HIGH           0x05
+#define LM83_REG_W_LOCAL_HIGH           0x0B
+#define LM83_REG_R_REMOTE1_TEMP         0x30
+#define LM83_REG_R_REMOTE1_HIGH         0x38
+#define LM83_REG_W_REMOTE1_HIGH         0x50
+#define LM83_REG_R_REMOTE2_TEMP         0x01
+#define LM83_REG_R_REMOTE2_HIGH         0x07
+#define LM83_REG_W_REMOTE2_HIGH         0x0D
+#define LM83_REG_R_REMOTE3_TEMP         0x31
+#define LM83_REG_R_REMOTE3_HIGH         0x3A
+#define LM83_REG_W_REMOTE3_HIGH         0x52
+#define LM83_REG_R_TCRIT                0x42
+#define LM83_REG_W_TCRIT                0x5A
+
+/*
+ * Conversions and various macros
+ * The LM83 uses signed 8-bit values with LSB = 1 degree Celsius.
+ */
+
+#define TEMP_FROM_REG(val)      ((val) * 1000)
+#define TEMP_TO_REG(val)        ((val) <= -128000 ? -128 : \
+                                 (val) >= 127000 ? 127 : \
+                                 (val) < 0 ? ((val) - 500) / 1000 : \
+                                 ((val) + 500) / 1000)
+
+static const u8 LM83_REG_R_TEMP[] = {
+        LM83_REG_R_LOCAL_TEMP,
+        LM83_REG_R_REMOTE1_TEMP,
+        LM83_REG_R_REMOTE2_TEMP,
+        LM83_REG_R_REMOTE3_TEMP,
+        LM83_REG_R_LOCAL_HIGH,
+        LM83_REG_R_REMOTE1_HIGH,
+        LM83_REG_R_REMOTE2_HIGH,
+        LM83_REG_R_REMOTE3_HIGH,
+        LM83_REG_R_TCRIT,
+};
+
+static const u8 LM83_REG_W_HIGH[] = {
+        LM83_REG_W_LOCAL_HIGH,
+        LM83_REG_W_REMOTE1_HIGH,
+        LM83_REG_W_REMOTE2_HIGH,
+        LM83_REG_W_REMOTE3_HIGH,
+        LM83_REG_W_TCRIT,
+};
+
+/*
+ * Functions declaration
+ */
+
+static int lm83_attach_adapter(struct i2c_adapter *adapter);
+static int lm83_detect(struct i2c_adapter *adapter, int address, int kind);
+static int lm83_detach_client(struct i2c_client *client);
+static struct lm83_data *lm83_update_device(struct device *dev);
+
+/*
+ * Driver data (common to all clients)
+ */
+ 
+static struct i2c_driver lm83_driver = {
+        .owner          = THIS_MODULE,
+        .name           = "lm83",
+        .id             = I2C_DRIVERID_LM83,
+        .flags          = I2C_DF_NOTIFY,
+        .attach_adapter = lm83_attach_adapter,
+        .detach_client  = lm83_detach_client,
+};
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct lm83_data {
+        struct i2c_client client;
+        struct semaphore update_lock;
+        char valid; /* zero until following fields are valid */
+        unsigned long last_updated; /* in jiffies */
+
+        /* registers values */
+        s8 temp[9];     /* 0..3: input 1-4,
+                           4..7: high limit 1-4,
+                           8   : critical limit */
+        u16 alarms; /* bitvector, combined */
+};
+
+/*
+ * 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 lm83_data *data = lm83_update_device(dev);
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
+}
+
+static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
+                        const char *buf, size_t count)
+{
+        struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+        struct i2c_client *client = to_i2c_client(dev);
+        struct lm83_data *data = i2c_get_clientdata(client);
+        long val = simple_strtol(buf, NULL, 10);
+        int nr = attr->index;
+
+        down(&data->update_lock);
+        data->temp[nr] = TEMP_TO_REG(val);
+        i2c_smbus_write_byte_data(client, LM83_REG_W_HIGH[nr - 4],
+                                  data->temp[nr]);
+        up(&data->update_lock);
+        return count;
+}
+
+static ssize_t show_alarms(struct device *dev, struct device_attribute *dummy,
+                           char *buf)
+{
+        struct lm83_data *data = lm83_update_device(dev);
+        return sprintf(buf, "%d\n", data->alarms);
+}
+
+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(temp4_input, S_IRUGO, show_temp, NULL, 3);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp,
+        set_temp, 4);
+static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp,
+        set_temp, 5);
+static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_temp,
+        set_temp, 6);
+static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_temp,
+        set_temp, 7);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, 8);
+static SENSOR_DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp, NULL, 8);
+static SENSOR_DEVICE_ATTR(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
+        set_temp, 8);
+static SENSOR_DEVICE_ATTR(temp4_crit, S_IRUGO, show_temp, NULL, 8);
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+
+/*
+ * Real code
+ */
+
+static int lm83_attach_adapter(struct i2c_adapter *adapter)
+{
+        if (!(adapter->class & I2C_CLASS_HWMON))
+                return 0;
+        return i2c_detect(adapter, &addr_data, lm83_detect);
+}
+
+/*
+ * The following function does more than just detection. If detection
+ * succeeds, it also registers the new chip.
+ */
+static int lm83_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+        struct i2c_client *new_client;
+        struct lm83_data *data;
+        int err = 0;
+        const char *name = "";
+
+        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                goto exit;
+
+        if (!(data = kmalloc(sizeof(struct lm83_data), GFP_KERNEL))) {
+                err = -ENOMEM;
+                goto exit;
+        }
+        memset(data, 0, sizeof(struct lm83_data));
+
+        /* The common I2C client data is placed right after the
+         * LM83-specific data. */
+        new_client = &data->client;
+        i2c_set_clientdata(new_client, data);
+        new_client->addr = address;
+        new_client->adapter = adapter;
+        new_client->driver = &lm83_driver;
+        new_client->flags = 0;
+
+        /* 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, LM83).
+         * 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 LM83 if forced */
+        if (kind == 0)
+                kind = lm83;
+
+        if (kind < 0) { /* detection */
+                if (((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS1)
+                    & 0xA8) != 0x00) ||
+                    ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_STATUS2)
+                    & 0x48) != 0x00) ||
+                    ((i2c_smbus_read_byte_data(new_client, LM83_REG_R_CONFIG)
+                    & 0x41) != 0x00)) {
+                        dev_dbg(&adapter->dev,
+                            "LM83 detection failed at 0x%02x.\n", address);
+                        goto exit_free;
+                }
+        }
+
+        if (kind <= 0) { /* identification */
+                u8 man_id, chip_id;
+
+                man_id = i2c_smbus_read_byte_data(new_client,
+                    LM83_REG_R_MAN_ID);
+                chip_id = i2c_smbus_read_byte_data(new_client,
+                    LM83_REG_R_CHIP_ID);
+
+                if (man_id == 0x01) { /* National Semiconductor */
+                        if (chip_id == 0x03) {
+                                kind = lm83;
+                        }
+                }
+
+                if (kind <= 0) { /* identification failed */
+                        dev_info(&adapter->dev,
+                            "Unsupported chip (man_id=0x%02X, "
+                            "chip_id=0x%02X).\n", man_id, chip_id);
+                        goto exit_free;
+                }
+        }
+
+        if (kind == lm83) {
+                name = "lm83";
+        }
+
+        /* We can fill in the remaining client fields */
+        strlcpy(new_client->name, name, I2C_NAME_SIZE);
+        data->valid = 0;
+        init_MUTEX(&data->update_lock);
+
+        /* Tell the I2C layer a new client has arrived */
+        if ((err = i2c_attach_client(new_client)))
+                goto exit_free;
+
+        /*
+         * Initialize the LM83 chip
+         * (Nothing to do for this one.)
+         */
+
+        /* Register sysfs hooks */
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp1_input.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp2_input.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp3_input.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp4_input.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp1_max.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp2_max.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp3_max.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp4_max.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp1_crit.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp2_crit.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp3_crit.dev_attr);
+        device_create_file(&new_client->dev,
+                           &sensor_dev_attr_temp4_crit.dev_attr);
+        device_create_file(&new_client->dev, &dev_attr_alarms);
+
+        return 0;
+
+exit_free:
+        kfree(data);
+exit:
+        return err;
+}
+
+static int lm83_detach_client(struct i2c_client *client)
+{
+        int err;
+
+        if ((err = i2c_detach_client(client))) {
+                dev_err(&client->dev,
+                    "Client deregistration failed, client not detached.\n");
+                return err;
+        }
+
+        kfree(i2c_get_clientdata(client));
+        return 0;
+}
+
+static struct lm83_data *lm83_update_device(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct lm83_data *data = i2c_get_clientdata(client);
+
+        down(&data->update_lock);
+
+        if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
+                int nr;
+
+                dev_dbg(&client->dev, "Updating lm83 data.\n");
+                for (nr = 0; nr < 9; nr++) {
+                        data->temp[nr] =
+                            i2c_smbus_read_byte_data(client,
+                            LM83_REG_R_TEMP[nr]);
+                }
+                data->alarms =
+                    i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS1)
+                    + (i2c_smbus_read_byte_data(client, LM83_REG_R_STATUS2)
+                    << 8);
+
+                data->last_updated = jiffies;
+                data->valid = 1;
+        }
+
+        up(&data->update_lock);
+
+        return data;
+}
+
+static int __init sensors_lm83_init(void)
+{
+        return i2c_add_driver(&lm83_driver);
+}
+
+static void __exit sensors_lm83_exit(void)
+{
+        i2c_del_driver(&lm83_driver);
+}
+
+MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
+MODULE_DESCRIPTION("LM83 driver");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_lm83_init);
+module_exit(sensors_lm83_exit);