Auto merge with /home/aegl/GIT/linus

1 files changed, 577 insertions, 0 deletions

diff --git a/drivers/hwmon/adm1025.c b/drivers/hwmon/adm1025.c
new file mode 100644
index 000000000000..e452d0daf906
--- /dev/null
+++ b/drivers/hwmon/adm1025.c
@@ -0,0 +1,577 @@
+/*
+ * adm1025.c
+ *
+ * Copyright (C) 2000       Chen-Yuan Wu <gwu@esoft.com>
+ * Copyright (C) 2003-2004  Jean Delvare <khali@linux-fr.org>
+ *
+ * The ADM1025 is a sensor chip made by Analog Devices. It reports up to 6
+ * voltages (including its own power source) and up to two temperatures
+ * (its own plus up to one external one). Voltages are scaled internally
+ * (which is not the common way) with ratios such that the nominal value
+ * of each voltage correspond to a register value of 192 (which means a
+ * resolution of about 0.5% of the nominal value). Temperature values are
+ * reported with a 1 deg resolution and a 3 deg accuracy. Complete
+ * datasheet can be obtained from Analog's website at:
+ *   http://www.analog.com/Analog_Root/productPage/productHome/0,2121,ADM1025,00.html
+ *
+ * This driver also supports the ADM1025A, which differs from the ADM1025
+ * only in that it has "open-drain VID inputs while the ADM1025 has
+ * on-chip 100k pull-ups on the VID inputs". It doesn't make any
+ * difference for us.
+ *
+ * This driver also supports the NE1619, a sensor chip made by Philips.
+ * That chip is similar to the ADM1025A, with a few differences. The only
+ * difference that matters to us is that the NE1619 has only two possible
+ * addresses while the ADM1025A has a third one. Complete datasheet can be
+ * obtained from Philips's website at:
+ *   http://www.semiconductors.philips.com/pip/NE1619DS.html
+ *
+ * Since the ADM1025 was the first chipset supported by this driver, most
+ * comments will refer to this chipset, but are actually general and
+ * concern all supported chipsets, unless mentioned otherwise.
+ *
+ * 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/i2c-vid.h>
+
+/*
+ * Addresses to scan
+ * ADM1025 and ADM1025A have three possible addresses: 0x2c, 0x2d and 0x2e.
+ * NE1619 has two possible addresses: 0x2c and 0x2d.
+ */
+
+static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };
+static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END };
+
+/*
+ * Insmod parameters
+ */
+
+SENSORS_INSMOD_2(adm1025, ne1619);
+
+/*
+ * The ADM1025 registers
+ */
+
+#define ADM1025_REG_MAN_ID              0x3E
+#define ADM1025_REG_CHIP_ID             0x3F
+#define ADM1025_REG_CONFIG              0x40
+#define ADM1025_REG_STATUS1             0x41
+#define ADM1025_REG_STATUS2             0x42
+#define ADM1025_REG_IN(nr)              (0x20 + (nr))
+#define ADM1025_REG_IN_MAX(nr)          (0x2B + (nr) * 2)
+#define ADM1025_REG_IN_MIN(nr)          (0x2C + (nr) * 2)
+#define ADM1025_REG_TEMP(nr)            (0x26 + (nr))
+#define ADM1025_REG_TEMP_HIGH(nr)       (0x37 + (nr) * 2)
+#define ADM1025_REG_TEMP_LOW(nr)        (0x38 + (nr) * 2)
+#define ADM1025_REG_VID                 0x47
+#define ADM1025_REG_VID4                0x49
+
+/*
+ * Conversions and various macros
+ * The ADM1025 uses signed 8-bit values for temperatures.
+ */
+
+static int in_scale[6] = { 2500, 2250, 3300, 5000, 12000, 3300 };
+
+#define IN_FROM_REG(reg,scale)  (((reg) * (scale) + 96) / 192)
+#define IN_TO_REG(val,scale)    ((val) <= 0 ? 0 : \
+                                 (val) * 192 >= (scale) * 255 ? 255 : \
+                                 ((val) * 192 + (scale)/2) / (scale))
+
+#define TEMP_FROM_REG(reg)      ((reg) * 1000)
+#define TEMP_TO_REG(val)        ((val) <= -127500 ? -128 : \
+                                 (val) >= 126500 ? 127 : \
+                                 (((val) < 0 ? (val)-500 : (val)+500) / 1000))
+
+/*
+ * Functions declaration
+ */
+
+static int adm1025_attach_adapter(struct i2c_adapter *adapter);
+static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind);
+static void adm1025_init_client(struct i2c_client *client);
+static int adm1025_detach_client(struct i2c_client *client);
+static struct adm1025_data *adm1025_update_device(struct device *dev);
+
+/*
+ * Driver data (common to all clients)
+ */
+
+static struct i2c_driver adm1025_driver = {
+        .owner          = THIS_MODULE,
+        .name           = "adm1025",
+        .id             = I2C_DRIVERID_ADM1025,
+        .flags          = I2C_DF_NOTIFY,
+        .attach_adapter = adm1025_attach_adapter,
+        .detach_client  = adm1025_detach_client,
+};
+
+/*
+ * Client data (each client gets its own)
+ */
+
+struct adm1025_data {
+        struct i2c_client client;
+        struct semaphore update_lock;
+        char valid; /* zero until following fields are valid */
+        unsigned long last_updated; /* in jiffies */
+
+        u8 in[6];               /* register value */
+        u8 in_max[6];           /* register value */
+        u8 in_min[6];           /* register value */
+        s8 temp[2];             /* register value */
+        s8 temp_min[2];         /* register value */
+        s8 temp_max[2];         /* register value */
+        u16 alarms;             /* register values, combined */
+        u8 vid;                 /* register values, combined */
+        u8 vrm;
+};
+
+/*
+ * Sysfs stuff
+ */
+
+#define show_in(offset) \
+static ssize_t show_in##offset(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+        struct adm1025_data *data = adm1025_update_device(dev); \
+        return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
+                       in_scale[offset])); \
+} \
+static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+        struct adm1025_data *data = adm1025_update_device(dev); \
+        return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
+                       in_scale[offset])); \
+} \
+static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+        struct adm1025_data *data = adm1025_update_device(dev); \
+        return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
+                       in_scale[offset])); \
+} \
+static DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in##offset, NULL);
+show_in(0);
+show_in(1);
+show_in(2);
+show_in(3);
+show_in(4);
+show_in(5);
+
+#define show_temp(offset) \
+static ssize_t show_temp##offset(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+        struct adm1025_data *data = adm1025_update_device(dev); \
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
+} \
+static ssize_t show_temp##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+        struct adm1025_data *data = adm1025_update_device(dev); \
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[offset-1])); \
+} \
+static ssize_t show_temp##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
+{ \
+        struct adm1025_data *data = adm1025_update_device(dev); \
+        return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[offset-1])); \
+}\
+static DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp##offset, NULL);
+show_temp(1);
+show_temp(2);
+
+#define set_in(offset) \
+static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
+        size_t count) \
+{ \
+        struct i2c_client *client = to_i2c_client(dev); \
+        struct adm1025_data *data = i2c_get_clientdata(client); \
+        long val = simple_strtol(buf, NULL, 10); \
+ \
+        down(&data->update_lock); \
+        data->in_min[offset] = IN_TO_REG(val, in_scale[offset]); \
+        i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MIN(offset), \
+                                  data->in_min[offset]); \
+        up(&data->update_lock); \
+        return count; \
+} \
+static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, const char *buf, \
+        size_t count) \
+{ \
+        struct i2c_client *client = to_i2c_client(dev); \
+        struct adm1025_data *data = i2c_get_clientdata(client); \
+        long val = simple_strtol(buf, NULL, 10); \
+ \
+        down(&data->update_lock); \
+        data->in_max[offset] = IN_TO_REG(val, in_scale[offset]); \
+        i2c_smbus_write_byte_data(client, ADM1025_REG_IN_MAX(offset), \
+                                  data->in_max[offset]); \
+        up(&data->update_lock); \
+        return count; \
+} \
+static DEVICE_ATTR(in##offset##_min, S_IWUSR | S_IRUGO, \
+        show_in##offset##_min, set_in##offset##_min); \
+static DEVICE_ATTR(in##offset##_max, S_IWUSR | S_IRUGO, \
+        show_in##offset##_max, set_in##offset##_max);
+set_in(0);
+set_in(1);
+set_in(2);
+set_in(3);
+set_in(4);
+set_in(5);
+
+#define set_temp(offset) \
+static ssize_t set_temp##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
+        size_t count) \
+{ \
+        struct i2c_client *client = to_i2c_client(dev); \
+        struct adm1025_data *data = i2c_get_clientdata(client); \
+        long val = simple_strtol(buf, NULL, 10); \
+ \
+        down(&data->update_lock); \
+        data->temp_min[offset-1] = TEMP_TO_REG(val); \
+        i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_LOW(offset-1), \
+                                  data->temp_min[offset-1]); \
+        up(&data->update_lock); \
+        return count; \
+} \
+static ssize_t set_temp##offset##_max(struct device *dev, struct device_attribute *attr, const char *buf, \
+        size_t count) \
+{ \
+        struct i2c_client *client = to_i2c_client(dev); \
+        struct adm1025_data *data = i2c_get_clientdata(client); \
+        long val = simple_strtol(buf, NULL, 10); \
+ \
+        down(&data->update_lock); \
+        data->temp_max[offset-1] = TEMP_TO_REG(val); \
+        i2c_smbus_write_byte_data(client, ADM1025_REG_TEMP_HIGH(offset-1), \
+                                  data->temp_max[offset-1]); \
+        up(&data->update_lock); \
+        return count; \
+} \
+static DEVICE_ATTR(temp##offset##_min, S_IWUSR | S_IRUGO, \
+        show_temp##offset##_min, set_temp##offset##_min); \
+static DEVICE_ATTR(temp##offset##_max, S_IWUSR | S_IRUGO, \
+        show_temp##offset##_max, set_temp##offset##_max);
+set_temp(1);
+set_temp(2);
+
+static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct adm1025_data *data = adm1025_update_device(dev);
+        return sprintf(buf, "%u\n", data->alarms);
+}
+static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+
+static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct adm1025_data *data = adm1025_update_device(dev);
+        return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
+}
+/* in1_ref is deprecated in favour of cpu0_vid, remove after 2005-11-11 */
+static DEVICE_ATTR(in1_ref, S_IRUGO, show_vid, NULL);
+static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);
+
+static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct adm1025_data *data = adm1025_update_device(dev);
+        return sprintf(buf, "%u\n", data->vrm);
+}
+static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct adm1025_data *data = i2c_get_clientdata(client);
+        data->vrm = simple_strtoul(buf, NULL, 10);
+        return count;
+}
+static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);
+
+/*
+ * Real code
+ */
+
+static int adm1025_attach_adapter(struct i2c_adapter *adapter)
+{
+        if (!(adapter->class & I2C_CLASS_HWMON))
+                return 0;
+        return i2c_detect(adapter, &addr_data, adm1025_detect);
+}
+
+/*
+ * The following function does more than just detection. If detection
+ * succeeds, it also registers the new chip.
+ */
+static int adm1025_detect(struct i2c_adapter *adapter, int address, int kind)
+{
+        struct i2c_client *new_client;
+        struct adm1025_data *data;
+        int err = 0;
+        const char *name = "";
+        u8 config;
+
+        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+                goto exit;
+
+        if (!(data = kmalloc(sizeof(struct adm1025_data), GFP_KERNEL))) {
+                err = -ENOMEM;
+                goto exit;
+        }
+        memset(data, 0, sizeof(struct adm1025_data));
+
+        /* The common I2C client data is placed right before the
+           ADM1025-specific data. */
+        new_client = &data->client;
+        i2c_set_clientdata(new_client, data);
+        new_client->addr = address;
+        new_client->adapter = adapter;
+        new_client->driver = &adm1025_driver;
+        new_client->flags = 0;
+
+        /*
+         * Now we do the remaining detection. A negative kind means that
+         * the driver was loaded with no force parameter (default), so we
+         * must both detect and identify the chip. 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.
+         */
+        config = i2c_smbus_read_byte_data(new_client, ADM1025_REG_CONFIG);
+        if (kind < 0) { /* detection */
+                if ((config & 0x80) != 0x00
+                 || (i2c_smbus_read_byte_data(new_client,
+                     ADM1025_REG_STATUS1) & 0xC0) != 0x00
+                 || (i2c_smbus_read_byte_data(new_client,
+                     ADM1025_REG_STATUS2) & 0xBC) != 0x00) {
+                        dev_dbg(&adapter->dev,
+                                "ADM1025 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,
+                         ADM1025_REG_MAN_ID);
+                chip_id = i2c_smbus_read_byte_data(new_client,
+                          ADM1025_REG_CHIP_ID);
+                
+                if (man_id == 0x41) { /* Analog Devices */
+                        if ((chip_id & 0xF0) == 0x20) { /* ADM1025/ADM1025A */
+                                kind = adm1025;
+                        }
+                } else
+                if (man_id == 0xA1) { /* Philips */
+                        if (address != 0x2E
+                         && (chip_id & 0xF0) == 0x20) { /* NE1619 */
+                                kind = ne1619;
+                        }
+                }
+
+                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 == adm1025) {
+                name = "adm1025";
+        } else if (kind == ne1619) {
+                name = "ne1619";
+        }
+
+        /* 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 ADM1025 chip */
+        adm1025_init_client(new_client);
+
+        /* Register sysfs hooks */
+        device_create_file(&new_client->dev, &dev_attr_in0_input);
+        device_create_file(&new_client->dev, &dev_attr_in1_input);
+        device_create_file(&new_client->dev, &dev_attr_in2_input);
+        device_create_file(&new_client->dev, &dev_attr_in3_input);
+        device_create_file(&new_client->dev, &dev_attr_in5_input);
+        device_create_file(&new_client->dev, &dev_attr_in0_min);
+        device_create_file(&new_client->dev, &dev_attr_in1_min);
+        device_create_file(&new_client->dev, &dev_attr_in2_min);
+        device_create_file(&new_client->dev, &dev_attr_in3_min);
+        device_create_file(&new_client->dev, &dev_attr_in5_min);
+        device_create_file(&new_client->dev, &dev_attr_in0_max);
+        device_create_file(&new_client->dev, &dev_attr_in1_max);
+        device_create_file(&new_client->dev, &dev_attr_in2_max);
+        device_create_file(&new_client->dev, &dev_attr_in3_max);
+        device_create_file(&new_client->dev, &dev_attr_in5_max);
+        device_create_file(&new_client->dev, &dev_attr_temp1_input);
+        device_create_file(&new_client->dev, &dev_attr_temp2_input);
+        device_create_file(&new_client->dev, &dev_attr_temp1_min);
+        device_create_file(&new_client->dev, &dev_attr_temp2_min);
+        device_create_file(&new_client->dev, &dev_attr_temp1_max);
+        device_create_file(&new_client->dev, &dev_attr_temp2_max);
+        device_create_file(&new_client->dev, &dev_attr_alarms);
+        /* in1_ref is deprecated, remove after 2005-11-11 */
+        device_create_file(&new_client->dev, &dev_attr_in1_ref);
+        device_create_file(&new_client->dev, &dev_attr_cpu0_vid);
+        device_create_file(&new_client->dev, &dev_attr_vrm);
+
+        /* Pin 11 is either in4 (+12V) or VID4 */
+        if (!(config & 0x20)) {
+                device_create_file(&new_client->dev, &dev_attr_in4_input);
+                device_create_file(&new_client->dev, &dev_attr_in4_min);
+                device_create_file(&new_client->dev, &dev_attr_in4_max);
+        }
+
+        return 0;
+
+exit_free:
+        kfree(data);
+exit:
+        return err;
+}
+
+static void adm1025_init_client(struct i2c_client *client)
+{
+        u8 reg;
+        struct adm1025_data *data = i2c_get_clientdata(client);
+        int i;
+
+        data->vrm = i2c_which_vrm();
+
+        /*
+         * Set high limits
+         * Usually we avoid setting limits on driver init, but it happens
+         * that the ADM1025 comes with stupid default limits (all registers
+         * set to 0). In case the chip has not gone through any limit
+         * setting yet, we better set the high limits to the max so that
+         * no alarm triggers.
+         */
+        for (i=0; i<6; i++) {
+                reg = i2c_smbus_read_byte_data(client,
+                                               ADM1025_REG_IN_MAX(i));
+                if (reg == 0)
+                        i2c_smbus_write_byte_data(client,
+                                                  ADM1025_REG_IN_MAX(i),
+                                                  0xFF);
+        }
+        for (i=0; i<2; i++) {
+                reg = i2c_smbus_read_byte_data(client,
+                                               ADM1025_REG_TEMP_HIGH(i));
+                if (reg == 0)
+                        i2c_smbus_write_byte_data(client,
+                                                  ADM1025_REG_TEMP_HIGH(i),
+                                                  0x7F);
+        }
+
+        /*
+         * Start the conversions
+         */
+        reg = i2c_smbus_read_byte_data(client, ADM1025_REG_CONFIG);
+        if (!(reg & 0x01))
+                i2c_smbus_write_byte_data(client, ADM1025_REG_CONFIG,
+                                          (reg&0x7E)|0x01);
+}
+
+static int adm1025_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 adm1025_data *adm1025_update_device(struct device *dev)
+{
+        struct i2c_client *client = to_i2c_client(dev);
+        struct adm1025_data *data = i2c_get_clientdata(client);
+
+        down(&data->update_lock);
+
+        if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
+                int i;
+
+                dev_dbg(&client->dev, "Updating data.\n");
+                for (i=0; i<6; i++) {
+                        data->in[i] = i2c_smbus_read_byte_data(client,
+                                      ADM1025_REG_IN(i));
+                        data->in_min[i] = i2c_smbus_read_byte_data(client,
+                                          ADM1025_REG_IN_MIN(i));
+                        data->in_max[i] = i2c_smbus_read_byte_data(client,
+                                          ADM1025_REG_IN_MAX(i));
+                }
+                for (i=0; i<2; i++) {
+                        data->temp[i] = i2c_smbus_read_byte_data(client,
+                                        ADM1025_REG_TEMP(i));
+                        data->temp_min[i] = i2c_smbus_read_byte_data(client,
+                                            ADM1025_REG_TEMP_LOW(i));
+                        data->temp_max[i] = i2c_smbus_read_byte_data(client,
+                                            ADM1025_REG_TEMP_HIGH(i));
+                }
+                data->alarms = i2c_smbus_read_byte_data(client,
+                               ADM1025_REG_STATUS1)
+                             | (i2c_smbus_read_byte_data(client,
+                                ADM1025_REG_STATUS2) << 8);
+                data->vid = (i2c_smbus_read_byte_data(client,
+                             ADM1025_REG_VID) & 0x0f)
+                          | ((i2c_smbus_read_byte_data(client,
+                              ADM1025_REG_VID4) & 0x01) << 4);
+
+                data->last_updated = jiffies;
+                data->valid = 1;
+        }
+
+        up(&data->update_lock);
+
+        return data;
+}
+
+static int __init sensors_adm1025_init(void)
+{
+        return i2c_add_driver(&adm1025_driver);
+}
+
+static void __exit sensors_adm1025_exit(void)
+{
+        i2c_del_driver(&adm1025_driver);
+}
+
+MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>");
+MODULE_DESCRIPTION("ADM1025 driver");
+MODULE_LICENSE("GPL");
+
+module_init(sensors_adm1025_init);
+module_exit(sensors_adm1025_exit);