diff options
Diffstat (limited to 'drivers/i2c/chips/adm1021.c')
| -rw-r--r-- | drivers/i2c/chips/adm1021.c | 411 |
1 files changed, 411 insertions, 0 deletions
diff --git a/drivers/i2c/chips/adm1021.c b/drivers/i2c/chips/adm1021.c new file mode 100644 index 000000000000..9c59a370b6d9 --- /dev/null +++ b/drivers/i2c/chips/adm1021.c @@ -0,0 +1,411 @@ +/* + adm1021.c - Part of lm_sensors, Linux kernel modules for hardware + monitoring + Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and + Philip Edelbrock <phil@netroedge.com> + + 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> + + +/* Addresses to scan */ +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_8(adm1021, adm1023, max1617, max1617a, thmc10, lm84, gl523sm, mc1066); + +/* adm1021 constants specified below */ + +/* The adm1021 registers */ +/* Read-only */ +#define ADM1021_REG_TEMP 0x00 +#define ADM1021_REG_REMOTE_TEMP 0x01 +#define ADM1021_REG_STATUS 0x02 +#define ADM1021_REG_MAN_ID 0x0FE /* 0x41 = AMD, 0x49 = TI, 0x4D = Maxim, 0x23 = Genesys , 0x54 = Onsemi*/ +#define ADM1021_REG_DEV_ID 0x0FF /* ADM1021 = 0x0X, ADM1023 = 0x3X */ +#define ADM1021_REG_DIE_CODE 0x0FF /* MAX1617A */ +/* These use different addresses for reading/writing */ +#define ADM1021_REG_CONFIG_R 0x03 +#define ADM1021_REG_CONFIG_W 0x09 +#define ADM1021_REG_CONV_RATE_R 0x04 +#define ADM1021_REG_CONV_RATE_W 0x0A +/* These are for the ADM1023's additional precision on the remote temp sensor */ +#define ADM1021_REG_REM_TEMP_PREC 0x010 +#define ADM1021_REG_REM_OFFSET 0x011 +#define ADM1021_REG_REM_OFFSET_PREC 0x012 +#define ADM1021_REG_REM_TOS_PREC 0x013 +#define ADM1021_REG_REM_THYST_PREC 0x014 +/* limits */ +#define ADM1021_REG_TOS_R 0x05 +#define ADM1021_REG_TOS_W 0x0B +#define ADM1021_REG_REMOTE_TOS_R 0x07 +#define ADM1021_REG_REMOTE_TOS_W 0x0D +#define ADM1021_REG_THYST_R 0x06 +#define ADM1021_REG_THYST_W 0x0C +#define ADM1021_REG_REMOTE_THYST_R 0x08 +#define ADM1021_REG_REMOTE_THYST_W 0x0E +/* write-only */ +#define ADM1021_REG_ONESHOT 0x0F + + +/* Conversions. Rounding and limit checking is only done on the TO_REG + variants. Note that you should be a bit careful with which arguments + these macros are called: arguments may be evaluated more than once. + Fixing this is just not worth it. */ +/* Conversions note: 1021 uses normal integer signed-byte format*/ +#define TEMP_FROM_REG(val) (val > 127 ? (val-256)*1000 : val*1000) +#define TEMP_TO_REG(val) (SENSORS_LIMIT((val < 0 ? (val/1000)+256 : val/1000),0,255)) + +/* Initial values */ + +/* Note: Even though I left the low and high limits named os and hyst, +they don't quite work like a thermostat the way the LM75 does. I.e., +a lower temp than THYST actually triggers an alarm instead of +clearing it. Weird, ey? --Phil */ + +/* Each client has this additional data */ +struct adm1021_data { + struct i2c_client client; + enum chips type; + + struct semaphore update_lock; + char valid; /* !=0 if following fields are valid */ + unsigned long last_updated; /* In jiffies */ + + u8 temp_max; /* Register values */ + u8 temp_hyst; + u8 temp_input; + u8 remote_temp_max; + u8 remote_temp_hyst; + u8 remote_temp_input; + u8 alarms; + /* special values for ADM1021 only */ + u8 die_code; + /* Special values for ADM1023 only */ + u8 remote_temp_prec; + u8 remote_temp_os_prec; + u8 remote_temp_hyst_prec; + u8 remote_temp_offset; + u8 remote_temp_offset_prec; +}; + +static int adm1021_attach_adapter(struct i2c_adapter *adapter); +static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind); +static void adm1021_init_client(struct i2c_client *client); +static int adm1021_detach_client(struct i2c_client *client); +static int adm1021_read_value(struct i2c_client *client, u8 reg); +static int adm1021_write_value(struct i2c_client *client, u8 reg, + u16 value); +static struct adm1021_data *adm1021_update_device(struct device *dev); + +/* (amalysh) read only mode, otherwise any limit's writing confuse BIOS */ +static int read_only = 0; + + +/* This is the driver that will be inserted */ +static struct i2c_driver adm1021_driver = { + .owner = THIS_MODULE, + .name = "adm1021", + .id = I2C_DRIVERID_ADM1021, + .flags = I2C_DF_NOTIFY, + .attach_adapter = adm1021_attach_adapter, + .detach_client = adm1021_detach_client, +}; + +#define show(value) \ +static ssize_t show_##value(struct device *dev, char *buf) \ +{ \ + struct adm1021_data *data = adm1021_update_device(dev); \ + return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \ +} +show(temp_max); +show(temp_hyst); +show(temp_input); +show(remote_temp_max); +show(remote_temp_hyst); +show(remote_temp_input); + +#define show2(value) \ +static ssize_t show_##value(struct device *dev, char *buf) \ +{ \ + struct adm1021_data *data = adm1021_update_device(dev); \ + return sprintf(buf, "%d\n", data->value); \ +} +show2(alarms); +show2(die_code); + +#define set(value, reg) \ +static ssize_t set_##value(struct device *dev, const char *buf, size_t count) \ +{ \ + struct i2c_client *client = to_i2c_client(dev); \ + struct adm1021_data *data = i2c_get_clientdata(client); \ + int temp = simple_strtoul(buf, NULL, 10); \ + \ + down(&data->update_lock); \ + data->value = TEMP_TO_REG(temp); \ + adm1021_write_value(client, reg, data->value); \ + up(&data->update_lock); \ + return count; \ +} +set(temp_max, ADM1021_REG_TOS_W); +set(temp_hyst, ADM1021_REG_THYST_W); +set(remote_temp_max, ADM1021_REG_REMOTE_TOS_W); +set(remote_temp_hyst, ADM1021_REG_REMOTE_THYST_W); + +static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, set_temp_max); +static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_hyst, set_temp_hyst); +static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL); +static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_remote_temp_max, set_remote_temp_max); +static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_remote_temp_hyst, set_remote_temp_hyst); +static DEVICE_ATTR(temp2_input, S_IRUGO, show_remote_temp_input, NULL); +static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); +static DEVICE_ATTR(die_code, S_IRUGO, show_die_code, NULL); + + +static int adm1021_attach_adapter(struct i2c_adapter *adapter) +{ + if (!(adapter->class & I2C_CLASS_HWMON)) + return 0; + return i2c_detect(adapter, &addr_data, adm1021_detect); +} + +static int adm1021_detect(struct i2c_adapter *adapter, int address, int kind) +{ + int i; + struct i2c_client *new_client; + struct adm1021_data *data; + int err = 0; + const char *type_name = ""; + + /* Make sure we aren't probing the ISA bus!! This is just a safety check + at this moment; i2c_detect really won't call us. */ +#ifdef DEBUG + if (i2c_is_isa_adapter(adapter)) { + dev_dbg(&adapter->dev, "adm1021_detect called for an ISA bus adapter?!?\n"); + return 0; + } +#endif + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) + goto error0; + + /* OK. For now, we presume we have a valid client. We now create the + client structure, even though we cannot fill it completely yet. + But it allows us to access adm1021_{read,write}_value. */ + + if (!(data = kmalloc(sizeof(struct adm1021_data), GFP_KERNEL))) { + err = -ENOMEM; + goto error0; + } + memset(data, 0, sizeof(struct adm1021_data)); + + new_client = &data->client; + i2c_set_clientdata(new_client, data); + new_client->addr = address; + new_client->adapter = adapter; + new_client->driver = &adm1021_driver; + new_client->flags = 0; + + /* Now, we do the remaining detection. */ + if (kind < 0) { + if ((adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0x03) != 0x00 + || (adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x3F) != 0x00 + || (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) & 0xF8) != 0x00) { + err = -ENODEV; + goto error1; + } + } + + /* Determine the chip type. */ + if (kind <= 0) { + i = adm1021_read_value(new_client, ADM1021_REG_MAN_ID); + if (i == 0x41) + if ((adm1021_read_value(new_client, ADM1021_REG_DEV_ID) & 0x0F0) == 0x030) + kind = adm1023; + else + kind = adm1021; + else if (i == 0x49) + kind = thmc10; + else if (i == 0x23) + kind = gl523sm; + else if ((i == 0x4d) && + (adm1021_read_value(new_client, ADM1021_REG_DEV_ID) == 0x01)) + kind = max1617a; + else if (i == 0x54) + kind = mc1066; + /* LM84 Mfr ID in a different place, and it has more unused bits */ + else if (adm1021_read_value(new_client, ADM1021_REG_CONV_RATE_R) == 0x00 + && (kind == 0 /* skip extra detection */ + || ((adm1021_read_value(new_client, ADM1021_REG_CONFIG_R) & 0x7F) == 0x00 + && (adm1021_read_value(new_client, ADM1021_REG_STATUS) & 0xAB) == 0x00))) + kind = lm84; + else + kind = max1617; + } + + if (kind == max1617) { + type_name = "max1617"; + } else if (kind == max1617a) { + type_name = "max1617a"; + } else if (kind == adm1021) { + type_name = "adm1021"; + } else if (kind == adm1023) { + type_name = "adm1023"; + } else if (kind == thmc10) { + type_name = "thmc10"; + } else if (kind == lm84) { + type_name = "lm84"; + } else if (kind == gl523sm) { + type_name = "gl523sm"; + } else if (kind == mc1066) { + type_name = "mc1066"; + } + + /* Fill in the remaining client fields and put it into the global list */ + strlcpy(new_client->name, type_name, I2C_NAME_SIZE); + data->type = kind; + 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 error1; + + /* Initialize the ADM1021 chip */ + if (kind != lm84) + adm1021_init_client(new_client); + + /* Register sysfs hooks */ + device_create_file(&new_client->dev, &dev_attr_temp1_max); + device_create_file(&new_client->dev, &dev_attr_temp1_min); + device_create_file(&new_client->dev, &dev_attr_temp1_input); + device_create_file(&new_client->dev, &dev_attr_temp2_max); + device_create_file(&new_client->dev, &dev_attr_temp2_min); + device_create_file(&new_client->dev, &dev_attr_temp2_input); + device_create_file(&new_client->dev, &dev_attr_alarms); + if (data->type == adm1021) + device_create_file(&new_client->dev, &dev_attr_die_code); + + return 0; + +error1: + kfree(data); +error0: + return err; +} + +static void adm1021_init_client(struct i2c_client *client) +{ + /* Enable ADC and disable suspend mode */ + adm1021_write_value(client, ADM1021_REG_CONFIG_W, + adm1021_read_value(client, ADM1021_REG_CONFIG_R) & 0xBF); + /* Set Conversion rate to 1/sec (this can be tinkered with) */ + adm1021_write_value(client, ADM1021_REG_CONV_RATE_W, 0x04); +} + +static int adm1021_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; +} + +/* All registers are byte-sized */ +static int adm1021_read_value(struct i2c_client *client, u8 reg) +{ + return i2c_smbus_read_byte_data(client, reg); +} + +static int adm1021_write_value(struct i2c_client *client, u8 reg, u16 value) +{ + if (!read_only) + return i2c_smbus_write_byte_data(client, reg, value); + return 0; +} + +static struct adm1021_data *adm1021_update_device(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct adm1021_data *data = i2c_get_clientdata(client); + + down(&data->update_lock); + + if (time_after(jiffies, data->last_updated + HZ + HZ / 2) + || !data->valid) { + dev_dbg(&client->dev, "Starting adm1021 update\n"); + + data->temp_input = adm1021_read_value(client, ADM1021_REG_TEMP); + data->temp_max = adm1021_read_value(client, ADM1021_REG_TOS_R); + data->temp_hyst = adm1021_read_value(client, ADM1021_REG_THYST_R); + data->remote_temp_input = adm1021_read_value(client, ADM1021_REG_REMOTE_TEMP); + data->remote_temp_max = adm1021_read_value(client, ADM1021_REG_REMOTE_TOS_R); + data->remote_temp_hyst = adm1021_read_value(client, ADM1021_REG_REMOTE_THYST_R); + data->alarms = adm1021_read_value(client, ADM1021_REG_STATUS) & 0x7c; + if (data->type == adm1021) + data->die_code = adm1021_read_value(client, ADM1021_REG_DIE_CODE); + if (data->type == adm1023) { + data->remote_temp_prec = adm1021_read_value(client, ADM1021_REG_REM_TEMP_PREC); + data->remote_temp_os_prec = adm1021_read_value(client, ADM1021_REG_REM_TOS_PREC); + data->remote_temp_hyst_prec = adm1021_read_value(client, ADM1021_REG_REM_THYST_PREC); + data->remote_temp_offset = adm1021_read_value(client, ADM1021_REG_REM_OFFSET); + data->remote_temp_offset_prec = adm1021_read_value(client, ADM1021_REG_REM_OFFSET_PREC); + } + data->last_updated = jiffies; + data->valid = 1; + } + + up(&data->update_lock); + + return data; +} + +static int __init sensors_adm1021_init(void) +{ + return i2c_add_driver(&adm1021_driver); +} + +static void __exit sensors_adm1021_exit(void) +{ + i2c_del_driver(&adm1021_driver); +} + +MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl> and " + "Philip Edelbrock <phil@netroedge.com>"); +MODULE_DESCRIPTION("adm1021 driver"); +MODULE_LICENSE("GPL"); + +module_param(read_only, bool, 0); +MODULE_PARM_DESC(read_only, "Don't set any values, read only mode"); + +module_init(sensors_adm1021_init) +module_exit(sensors_adm1021_exit) |