| /* |
| * 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)); |
| } |
| static DEVICE_ATTR(in1_ref, 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); |
| device_create_file(&new_client->dev, &dev_attr_in1_ref); |
| 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); |