/* * lm90.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring * Copyright (C) 2003 Jean Delvare * * Based on the lm83 driver. The LM90 is a sensor chip made by National * Semiconductor. It reports up to two temperatures (its own plus up to * one external one) with a 0.125 deg resolution (1 deg for local * temperature) and a 3-4 deg accuracy. Complete datasheet can be * obtained from National's website at: * http://www.national.com/pf/LM/LM90.html * * This driver also supports the ADM1032, a sensor chip made by Analog * Devices. That chip is similar to the LM90, with a few differences * that are not handled by this driver. Complete datasheet can be * obtained from Analog's website at: * http://products.analog.com/products/info.asp?product=ADM1032 * * Since the LM90 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 #include #include #include #include #include /* * Addresses to scan * Address is fully defined internally and cannot be changed. */ static unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END }; static unsigned short normal_i2c_range[] = { I2C_CLIENT_END }; static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; static unsigned int normal_isa_range[] = { I2C_CLIENT_ISA_END }; /* * Insmod parameters */ SENSORS_INSMOD_2(lm90, adm1032); /* * The LM90 registers */ #define LM90_REG_R_MAN_ID 0xFE #define LM90_REG_R_CHIP_ID 0xFF #define LM90_REG_R_CONFIG1 0x03 #define LM90_REG_W_CONFIG1 0x09 #define LM90_REG_R_CONFIG2 0xBF #define LM90_REG_W_CONFIG2 0xBF #define LM90_REG_R_CONVRATE 0x04 #define LM90_REG_W_CONVRATE 0x0A #define LM90_REG_R_STATUS 0x02 #define LM90_REG_R_LOCAL_TEMP 0x00 #define LM90_REG_R_LOCAL_HIGH 0x05 #define LM90_REG_W_LOCAL_HIGH 0x0B #define LM90_REG_R_LOCAL_LOW 0x06 #define LM90_REG_W_LOCAL_LOW 0x0C #define LM90_REG_R_LOCAL_CRIT 0x20 #define LM90_REG_W_LOCAL_CRIT 0x20 #define LM90_REG_R_REMOTE_TEMPH 0x01 #define LM90_REG_R_REMOTE_TEMPL 0x10 #define LM90_REG_R_REMOTE_OFFSH 0x11 #define LM90_REG_W_REMOTE_OFFSH 0x11 #define LM90_REG_R_REMOTE_OFFSL 0x12 #define LM90_REG_W_REMOTE_OFFSL 0x12 #define LM90_REG_R_REMOTE_HIGHH 0x07 #define LM90_REG_W_REMOTE_HIGHH 0x0D #define LM90_REG_R_REMOTE_HIGHL 0x13 #define LM90_REG_W_REMOTE_HIGHL 0x13 #define LM90_REG_R_REMOTE_LOWH 0x08 #define LM90_REG_W_REMOTE_LOWH 0x0E #define LM90_REG_R_REMOTE_LOWL 0x14 #define LM90_REG_W_REMOTE_LOWL 0x14 #define LM90_REG_R_REMOTE_CRIT 0x19 #define LM90_REG_W_REMOTE_CRIT 0x19 #define LM90_REG_R_TCRIT_HYST 0x21 #define LM90_REG_W_TCRIT_HYST 0x21 /* * Conversions and various macros * The LM90 uses signed 8-bit values for the local temperatures, * and signed 11-bit values for the remote temperatures (except * T_CRIT). Note that TEMP2_TO_REG does not round values, but * stick to the nearest lower value instead. Fixing it is just * not worth it. */ #define TEMP1_FROM_REG(val) ((val & 0x80 ? val-0x100 : val) * 1000) #define TEMP1_TO_REG(val) ((val < 0 ? val+0x100*1000 : val) / 1000) #define TEMP2_FROM_REG(val) (((val & 0x8000 ? val-0x10000 : val) >> 5) * 125) #define TEMP2_TO_REG(val) ((((val / 125) << 5) + (val < 0 ? 0x10000 : 0)) & 0xFFE0) #define HYST_FROM_REG(val) (val * 1000) #define HYST_TO_REG(val) (val <= 0 ? 0 : val >= 31000 ? 31 : val / 1000) /* * Functions declaration */ static int lm90_attach_adapter(struct i2c_adapter *adapter); static int lm90_detect(struct i2c_adapter *adapter, int address, int kind); static void lm90_init_client(struct i2c_client *client); static int lm90_detach_client(struct i2c_client *client); static struct lm90_data *lm90_update_device(struct device *dev); /* * Driver data (common to all clients) */ static struct i2c_driver lm90_driver = { .owner = THIS_MODULE, .name = "lm90", .id = I2C_DRIVERID_LM90, .flags = I2C_DF_NOTIFY, .attach_adapter = lm90_attach_adapter, .detach_client = lm90_detach_client, }; /* * Client data (each client gets its own) */ struct lm90_data { struct i2c_client client; struct semaphore update_lock; char valid; /* zero until following fields are valid */ unsigned long last_updated; /* in jiffies */ /* registers values */ u8 temp_input1, temp_low1, temp_high1; /* local */ u16 temp_input2, temp_low2, temp_high2; /* remote, combined */ u8 temp_crit1, temp_crit2; u8 temp_hyst; u16 alarms; /* bitvector, combined */ }; /* * Internal variables */ static int lm90_id = 0; /* * Sysfs stuff */ #define show_temp(value, converter) \ static ssize_t show_##value(struct device *dev, char *buf) \ { \ struct lm90_data *data = lm90_update_device(dev); \ return sprintf(buf, "%d\n", converter(data->value)); \ } show_temp(temp_input1, TEMP1_FROM_REG); show_temp(temp_input2, TEMP2_FROM_REG); show_temp(temp_low1, TEMP1_FROM_REG); show_temp(temp_low2, TEMP2_FROM_REG); show_temp(temp_high1, TEMP1_FROM_REG); show_temp(temp_high2, TEMP2_FROM_REG); show_temp(temp_crit1, TEMP1_FROM_REG); show_temp(temp_crit2, TEMP1_FROM_REG); #define set_temp1(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 lm90_data *data = i2c_get_clientdata(client); \ data->value = TEMP1_TO_REG(simple_strtol(buf, NULL, 10)); \ i2c_smbus_write_byte_data(client, reg, data->value); \ return count; \ } #define set_temp2(value, regh, regl) \ static ssize_t set_##value(struct device *dev, const char *buf, \ size_t count) \ { \ struct i2c_client *client = to_i2c_client(dev); \ struct lm90_data *data = i2c_get_clientdata(client); \ data->value = TEMP2_TO_REG(simple_strtol(buf, NULL, 10)); \ i2c_smbus_write_byte_data(client, regh, data->value >> 8); \ i2c_smbus_write_byte_data(client, regl, data->value & 0xff); \ return count; \ } set_temp1(temp_low1, LM90_REG_W_LOCAL_LOW); set_temp2(temp_low2, LM90_REG_W_REMOTE_LOWH, LM90_REG_W_REMOTE_LOWL); set_temp1(temp_high1, LM90_REG_W_LOCAL_HIGH); set_temp2(temp_high2, LM90_REG_W_REMOTE_HIGHH, LM90_REG_W_REMOTE_HIGHL); set_temp1(temp_crit1, LM90_REG_W_LOCAL_CRIT); set_temp1(temp_crit2, LM90_REG_W_REMOTE_CRIT); #define show_temp_hyst(value, basereg) \ static ssize_t show_##value(struct device *dev, char *buf) \ { \ struct lm90_data *data = lm90_update_device(dev); \ return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->basereg) \ - HYST_FROM_REG(data->temp_hyst)); \ } show_temp_hyst(temp_hyst1, temp_crit1); show_temp_hyst(temp_hyst2, temp_crit2); static ssize_t set_temp_hyst1(struct device *dev, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct lm90_data *data = i2c_get_clientdata(client); int hyst = TEMP1_FROM_REG(data->temp_crit1) - simple_strtol(buf, NULL, 10); i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST, HYST_TO_REG(hyst)); return count; } static ssize_t show_alarms(struct device *dev, char *buf) { struct lm90_data *data = lm90_update_device(dev); return sprintf(buf, "%d\n", data->alarms); } static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL); static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input2, NULL); static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_low1, set_temp_low1); static DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_low2, set_temp_low2); static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_high1, set_temp_high1); static DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_high2, set_temp_high2); static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit1, set_temp_crit1); static DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit2, set_temp_crit2); static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_hyst1, set_temp_hyst1); static DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_hyst2, NULL); static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); /* * Real code */ static int lm90_attach_adapter(struct i2c_adapter *adapter) { if (!(adapter->class & I2C_ADAP_CLASS_SMBUS)) return 0; return i2c_detect(adapter, &addr_data, lm90_detect); } /* * The following function does more than just detection. If detection * succeeds, it also registers the new chip. */ static int lm90_detect(struct i2c_adapter *adapter, int address, int kind) { struct i2c_client *new_client; struct lm90_data *data; int err = 0; const char *name = ""; u8 reg_config1=0, reg_convrate=0; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) goto exit; if (!(data = kmalloc(sizeof(struct lm90_data), GFP_KERNEL))) { err = -ENOMEM; goto exit; } memset(data, 0, sizeof(struct lm90_data)); /* The common I2C client data is placed right before the LM90-specific data. */ new_client = &data->client; i2c_set_clientdata(new_client, data); new_client->addr = address; new_client->adapter = adapter; new_client->driver = &lm90_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. */ if (kind < 0) { /* detection */ reg_config1 = i2c_smbus_read_byte_data(new_client, LM90_REG_R_CONFIG1); reg_convrate = i2c_smbus_read_byte_data(new_client, LM90_REG_R_CONVRATE); if ((reg_config1 & 0x2A) != 0x00 || reg_convrate > 0x0A) { dev_dbg(&adapter->dev, "LM90 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, LM90_REG_R_MAN_ID); chip_id = i2c_smbus_read_byte_data(new_client, LM90_REG_R_CHIP_ID); if (man_id == 0x01) { /* National Semiconductor */ if (chip_id >= 0x21 && chip_id < 0x30 /* LM90 */ && (kind == 0 /* skip detection */ || ((i2c_smbus_read_byte_data(new_client, LM90_REG_R_CONFIG2) & 0xF8) == 0x00 && reg_convrate <= 0x09))) { kind = lm90; } } else if (man_id == 0x41) { /* Analog Devices */ if ((chip_id & 0xF0) == 0x40 /* ADM1032 */ && (kind == 0 /* skip detection */ || (reg_config1 & 0x3F) == 0x00)) { kind = adm1032; } } 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 == lm90) { name = "lm90"; } else if (kind == adm1032) { name = "adm1032"; } /* We can fill in the remaining client fields */ strlcpy(new_client->name, name, I2C_NAME_SIZE); new_client->id = lm90_id++; 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 LM90 chip */ lm90_init_client(new_client); /* Register sysfs hooks */ 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_temp1_crit); device_create_file(&new_client->dev, &dev_attr_temp2_crit); device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst); device_create_file(&new_client->dev, &dev_attr_temp2_crit_hyst); device_create_file(&new_client->dev, &dev_attr_alarms); return 0; exit_free: kfree(data); exit: return err; } static void lm90_init_client(struct i2c_client *client) { u8 config; /* * Start the conversions. */ i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE, 5); /* 2 Hz */ config = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1); if (config & 0x40) i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config & 0xBF); /* run */ } static int lm90_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 lm90_data *lm90_update_device(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct lm90_data *data = i2c_get_clientdata(client); down(&data->update_lock); if ((jiffies - data->last_updated > HZ * 2) || (jiffies < data->last_updated) || !data->valid) { u8 oldh, newh; dev_dbg(&client->dev, "Updating lm90 data.\n"); data->temp_input1 = i2c_smbus_read_byte_data(client, LM90_REG_R_LOCAL_TEMP); data->temp_high1 = i2c_smbus_read_byte_data(client, LM90_REG_R_LOCAL_HIGH); data->temp_low1 = i2c_smbus_read_byte_data(client, LM90_REG_R_LOCAL_LOW); data->temp_crit1 = i2c_smbus_read_byte_data(client, LM90_REG_R_LOCAL_CRIT); data->temp_crit2 = i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_CRIT); data->temp_hyst = i2c_smbus_read_byte_data(client, LM90_REG_R_TCRIT_HYST); /* * There is a trick here. We have to read two registers to * have the remote sensor temperature, but we have to beware * a conversion could occur inbetween the readings. The * datasheet says we should either use the one-shot * conversion register, which we don't want to do (disables * hardware monitoring) or monitor the busy bit, which is * impossible (we can't read the values and monitor that bit * at the exact same time). So the solution used here is to * read the high byte once, then the low byte, then the high * byte again. If the new high byte matches the old one, * then we have a valid reading. Else we have to read the low * byte again, and now we believe we have a correct reading. */ oldh = i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_TEMPH); data->temp_input2 = i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_TEMPL); newh = i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_TEMPH); if (newh != oldh) { data->temp_input2 = i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_TEMPL); #ifdef DEBUG oldh = i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_TEMPH); /* oldh is actually newer */ if (newh != oldh) dev_warn(&client->dev, "Remote temperature may be " "wrong.\n"); #endif } data->temp_input2 |= (newh << 8); data->temp_high2 = (i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_HIGHH) << 8) + i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_HIGHL); data->temp_low2 = (i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_LOWH) << 8) + i2c_smbus_read_byte_data(client, LM90_REG_R_REMOTE_LOWL); data->alarms = i2c_smbus_read_byte_data(client, LM90_REG_R_STATUS); data->last_updated = jiffies; data->valid = 1; } up(&data->update_lock); return data; } static int __init sensors_lm90_init(void) { return i2c_add_driver(&lm90_driver); } static void __exit sensors_lm90_exit(void) { i2c_del_driver(&lm90_driver); } MODULE_AUTHOR("Jean Delvare "); MODULE_DESCRIPTION("LM90/ADM1032 driver"); MODULE_LICENSE("GPL"); module_init(sensors_lm90_init); module_exit(sensors_lm90_exit);