diff options
Diffstat (limited to 'drivers/i2c/chips/adm1025.c')
| -rw-r--r-- | drivers/i2c/chips/adm1025.c | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/drivers/i2c/chips/adm1025.c b/drivers/i2c/chips/adm1025.c new file mode 100644 index 00000000000..e0771a3d05c --- /dev/null +++ b/drivers/i2c/chips/adm1025.c @@ -0,0 +1,574 @@ +/* + * 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/config.h> +#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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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, 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); |