--- /dev/null
+/*
+ * 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/hwmon.h>
+#include <linux/hwmon-vid.h>
+#include <linux/err.h>
+#include <linux/mutex.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 };
+
+/*
+ * Insmod parameters
+ */
+
+I2C_CLIENT_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 = {
+ .driver = {
+ .name = "adm1025",
+ },
+ .id = I2C_DRIVERID_ADM1025,
+ .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 class_device *class_dev;
+ struct mutex 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); \
+ \
+ mutex_lock(&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]); \
+ mutex_unlock(&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); \
+ \
+ mutex_lock(&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]); \
+ mutex_unlock(&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); \
+ \
+ mutex_lock(&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]); \
+ mutex_unlock(&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); \
+ \
+ mutex_lock(&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]); \
+ mutex_unlock(&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));
+}
+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_probe(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 = kzalloc(sizeof(struct adm1025_data), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto exit;
+ }
+
+ /* 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;
+ mutex_init(&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 */
+ data->class_dev = hwmon_device_register(&new_client->dev);
+ if (IS_ERR(data->class_dev)) {
+ err = PTR_ERR(data->class_dev);
+ goto exit_detach;
+ }
+
+ 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);
+ 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_detach:
+ i2c_detach_client(new_client);
+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 = vid_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)
+{
+ struct adm1025_data *data = i2c_get_clientdata(client);
+ int err;
+
+ hwmon_device_unregister(data->class_dev);
+
+ if ((err = i2c_detach_client(client)))
+ return err;
+
+ kfree(data);
+ 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);
+
+ mutex_lock(&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;
+ }
+
+ mutex_unlock(&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);
git://git.onelab.eu / linux-2.6.git / blobdiff