diff options
Diffstat (limited to 'drivers/i2c/chips/lm92.c')
| -rw-r--r-- | drivers/i2c/chips/lm92.c | 429 |
1 files changed, 0 insertions, 429 deletions
diff --git a/drivers/i2c/chips/lm92.c b/drivers/i2c/chips/lm92.c deleted file mode 100644 index 215c8e4..0000000 --- a/drivers/i2c/chips/lm92.c +++ /dev/null @@ -1,429 +0,0 @@ -/* - * lm92 - Hardware monitoring driver - * Copyright (C) 2005 Jean Delvare <khali@linux-fr.org> - * - * Based on the lm90 driver, with some ideas taken from the lm_sensors - * lm92 driver as well. - * - * The LM92 is a sensor chip made by National Semiconductor. It reports - * its own temperature with a 0.0625 deg resolution and a 0.33 deg - * accuracy. Complete datasheet can be obtained from National's website - * at: - * http://www.national.com/pf/LM/LM92.html - * - * This driver also supports the MAX6635 sensor chip made by Maxim. - * This chip is compatible with the LM92, but has a lesser accuracy - * (1.0 deg). Complete datasheet can be obtained from Maxim's website - * at: - * http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3074 - * - * Since the LM92 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. - * - * Support could easily be added for the National Semiconductor LM76 - * and Maxim MAX6633 and MAX6634 chips, which are mostly compatible - * with the LM92. - * - * 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/i2c.h> -#include <linux/i2c-sensor.h> - - -/* The LM92 and MAX6635 have 2 two-state pins for address selection, - resulting in 4 possible addresses. */ -static unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, - I2C_CLIENT_END }; -static unsigned int normal_isa[] = { I2C_CLIENT_ISA_END }; - -/* Insmod parameters */ -SENSORS_INSMOD_1(lm92); - -/* The LM92 registers */ -#define LM92_REG_CONFIG 0x01 /* 8-bit, RW */ -#define LM92_REG_TEMP 0x00 /* 16-bit, RO */ -#define LM92_REG_TEMP_HYST 0x02 /* 16-bit, RW */ -#define LM92_REG_TEMP_CRIT 0x03 /* 16-bit, RW */ -#define LM92_REG_TEMP_LOW 0x04 /* 16-bit, RW */ -#define LM92_REG_TEMP_HIGH 0x05 /* 16-bit, RW */ -#define LM92_REG_MAN_ID 0x07 /* 16-bit, RO, LM92 only */ - -/* The LM92 uses signed 13-bit values with LSB = 0.0625 degree Celsius, - left-justified in 16-bit registers. No rounding is done, with such - a resolution it's just not worth it. Note that the MAX6635 doesn't - make use of the 4 lower bits for limits (i.e. effective resolution - for limits is 1 degree Celsius). */ -static inline int TEMP_FROM_REG(s16 reg) -{ - return reg / 8 * 625 / 10; -} - -static inline s16 TEMP_TO_REG(int val) -{ - if (val <= -60000) - return -60000 * 10 / 625 * 8; - if (val >= 160000) - return 160000 * 10 / 625 * 8; - return val * 10 / 625 * 8; -} - -/* Alarm flags are stored in the 3 LSB of the temperature register */ -static inline u8 ALARMS_FROM_REG(s16 reg) -{ - return reg & 0x0007; -} - -/* Driver data (common to all clients) */ -static struct i2c_driver lm92_driver; - -/* Client data (each client gets its own) */ -struct lm92_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 */ - s16 temp1_input, temp1_crit, temp1_min, temp1_max, temp1_hyst; -}; - - -/* - * Sysfs attributes and callback functions - */ - -static struct lm92_data *lm92_update_device(struct device *dev) -{ - struct i2c_client *client = to_i2c_client(dev); - struct lm92_data *data = i2c_get_clientdata(client); - - down(&data->update_lock); - - if (time_after(jiffies, data->last_updated + HZ) - || !data->valid) { - dev_dbg(&client->dev, "Updating lm92 data\n"); - data->temp1_input = swab16(i2c_smbus_read_word_data(client, - LM92_REG_TEMP)); - data->temp1_hyst = swab16(i2c_smbus_read_word_data(client, - LM92_REG_TEMP_HYST)); - data->temp1_crit = swab16(i2c_smbus_read_word_data(client, - LM92_REG_TEMP_CRIT)); - data->temp1_min = swab16(i2c_smbus_read_word_data(client, - LM92_REG_TEMP_LOW)); - data->temp1_max = swab16(i2c_smbus_read_word_data(client, - LM92_REG_TEMP_HIGH)); - - data->last_updated = jiffies; - data->valid = 1; - } - - up(&data->update_lock); - - return data; -} - -#define show_temp(value) \ -static ssize_t show_##value(struct device *dev, struct device_attribute *attr, char *buf) \ -{ \ - struct lm92_data *data = lm92_update_device(dev); \ - return sprintf(buf, "%d\n", TEMP_FROM_REG(data->value)); \ -} -show_temp(temp1_input); -show_temp(temp1_crit); -show_temp(temp1_min); -show_temp(temp1_max); - -#define set_temp(value, reg) \ -static ssize_t set_##value(struct device *dev, struct device_attribute *attr, const char *buf, \ - size_t count) \ -{ \ - struct i2c_client *client = to_i2c_client(dev); \ - struct lm92_data *data = i2c_get_clientdata(client); \ - long val = simple_strtol(buf, NULL, 10); \ - \ - down(&data->update_lock); \ - data->value = TEMP_TO_REG(val); \ - i2c_smbus_write_word_data(client, reg, swab16(data->value)); \ - up(&data->update_lock); \ - return count; \ -} -set_temp(temp1_crit, LM92_REG_TEMP_CRIT); -set_temp(temp1_min, LM92_REG_TEMP_LOW); -set_temp(temp1_max, LM92_REG_TEMP_HIGH); - -static ssize_t show_temp1_crit_hyst(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct lm92_data *data = lm92_update_device(dev); - return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_crit) - - TEMP_FROM_REG(data->temp1_hyst)); -} -static ssize_t show_temp1_max_hyst(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct lm92_data *data = lm92_update_device(dev); - return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_max) - - TEMP_FROM_REG(data->temp1_hyst)); -} -static ssize_t show_temp1_min_hyst(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct lm92_data *data = lm92_update_device(dev); - return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp1_min) - + TEMP_FROM_REG(data->temp1_hyst)); -} - -static ssize_t set_temp1_crit_hyst(struct device *dev, struct device_attribute *attr, const char *buf, - size_t count) -{ - struct i2c_client *client = to_i2c_client(dev); - struct lm92_data *data = i2c_get_clientdata(client); - long val = simple_strtol(buf, NULL, 10); - - down(&data->update_lock); - data->temp1_hyst = TEMP_FROM_REG(data->temp1_crit) - val; - i2c_smbus_write_word_data(client, LM92_REG_TEMP_HYST, - swab16(TEMP_TO_REG(data->temp1_hyst))); - up(&data->update_lock); - return count; -} - -static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf) -{ - struct lm92_data *data = lm92_update_device(dev); - return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->temp1_input)); -} - -static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp1_input, NULL); -static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp1_crit, - set_temp1_crit); -static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp1_crit_hyst, - set_temp1_crit_hyst); -static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp1_min, - set_temp1_min); -static DEVICE_ATTR(temp1_min_hyst, S_IRUGO, show_temp1_min_hyst, NULL); -static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp1_max, - set_temp1_max); -static DEVICE_ATTR(temp1_max_hyst, S_IRUGO, show_temp1_max_hyst, NULL); -static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL); - - -/* - * Detection and registration - */ - -static void lm92_init_client(struct i2c_client *client) -{ - u8 config; - - /* Start the conversions if needed */ - config = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG); - if (config & 0x01) - i2c_smbus_write_byte_data(client, LM92_REG_CONFIG, - config & 0xFE); -} - -/* The MAX6635 has no identification register, so we have to use tricks - to identify it reliably. This is somewhat slow. - Note that we do NOT rely on the 2 MSB of the configuration register - always reading 0, as suggested by the datasheet, because it was once - reported not to be true. */ -static int max6635_check(struct i2c_client *client) -{ - u16 temp_low, temp_high, temp_hyst, temp_crit; - u8 conf; - int i; - - /* No manufacturer ID register, so a read from this address will - always return the last read value. */ - temp_low = i2c_smbus_read_word_data(client, LM92_REG_TEMP_LOW); - if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_low) - return 0; - temp_high = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HIGH); - if (i2c_smbus_read_word_data(client, LM92_REG_MAN_ID) != temp_high) - return 0; - - /* Limits are stored as integer values (signed, 9-bit). */ - if ((temp_low & 0x7f00) || (temp_high & 0x7f00)) - return 0; - temp_hyst = i2c_smbus_read_word_data(client, LM92_REG_TEMP_HYST); - temp_crit = i2c_smbus_read_word_data(client, LM92_REG_TEMP_CRIT); - if ((temp_hyst & 0x7f00) || (temp_crit & 0x7f00)) - return 0; - - /* Registers addresses were found to cycle over 16-byte boundaries. - We don't test all registers with all offsets so as to save some - reads and time, but this should still be sufficient to dismiss - non-MAX6635 chips. */ - conf = i2c_smbus_read_byte_data(client, LM92_REG_CONFIG); - for (i=16; i<96; i*=2) { - if (temp_hyst != i2c_smbus_read_word_data(client, - LM92_REG_TEMP_HYST + i - 16) - || temp_crit != i2c_smbus_read_word_data(client, - LM92_REG_TEMP_CRIT + i) - || temp_low != i2c_smbus_read_word_data(client, - LM92_REG_TEMP_LOW + i + 16) - || temp_high != i2c_smbus_read_word_data(client, - LM92_REG_TEMP_HIGH + i + 32) - || conf != i2c_smbus_read_byte_data(client, - LM92_REG_CONFIG + i)) - return 0; - } - - return 1; -} - -/* The following function does more than just detection. If detection - succeeds, it also registers the new chip. */ -static int lm92_detect(struct i2c_adapter *adapter, int address, int kind) -{ - struct i2c_client *new_client; - struct lm92_data *data; - int err = 0; - char *name; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA - | I2C_FUNC_SMBUS_WORD_DATA)) - goto exit; - - if (!(data = kmalloc(sizeof(struct lm92_data), GFP_KERNEL))) { - err = -ENOMEM; - goto exit; - } - memset(data, 0, sizeof(struct lm92_data)); - - /* Fill in enough client fields so that we can read from the chip, - which is required for identication */ - new_client = &data->client; - i2c_set_clientdata(new_client, data); - new_client->addr = address; - new_client->adapter = adapter; - new_client->driver = &lm92_driver; - new_client->flags = 0; - - /* A negative kind means that the driver was loaded with no force - parameter (default), so we must identify the chip. */ - if (kind < 0) { - u8 config = i2c_smbus_read_byte_data(new_client, - LM92_REG_CONFIG); - u16 man_id = i2c_smbus_read_word_data(new_client, - LM92_REG_MAN_ID); - - if ((config & 0xe0) == 0x00 - && man_id == 0x0180) { - pr_info("lm92: Found National Semiconductor LM92 chip\n"); - kind = lm92; - } else - if (max6635_check(new_client)) { - pr_info("lm92: Found Maxim MAX6635 chip\n"); - kind = lm92; /* No separate prefix */ - } - else - goto exit_free; - } else - if (kind == 0) /* Default to an LM92 if forced */ - kind = lm92; - - /* Give it the proper name */ - if (kind == lm92) { - name = "lm92"; - } else { /* Supposedly cannot happen */ - dev_dbg(&new_client->dev, "Kind out of range?\n"); - goto exit_free; - } - - /* 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 subsystem a new client has arrived */ - if ((err = i2c_attach_client(new_client))) - goto exit_free; - - /* Initialize the chipset */ - lm92_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_temp1_crit); - device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst); - device_create_file(&new_client->dev, &dev_attr_temp1_min); - device_create_file(&new_client->dev, &dev_attr_temp1_min_hyst); - device_create_file(&new_client->dev, &dev_attr_temp1_max); - device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst); - device_create_file(&new_client->dev, &dev_attr_alarms); - - return 0; - -exit_free: - kfree(data); -exit: - return err; -} - -static int lm92_attach_adapter(struct i2c_adapter *adapter) -{ - if (!(adapter->class & I2C_CLASS_HWMON)) - return 0; - return i2c_detect(adapter, &addr_data, lm92_detect); -} - -static int lm92_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; -} - - -/* - * Module and driver stuff - */ - -static struct i2c_driver lm92_driver = { - .owner = THIS_MODULE, - .name = "lm92", - .id = I2C_DRIVERID_LM92, - .flags = I2C_DF_NOTIFY, - .attach_adapter = lm92_attach_adapter, - .detach_client = lm92_detach_client, -}; - -static int __init sensors_lm92_init(void) -{ - return i2c_add_driver(&lm92_driver); -} - -static void __exit sensors_lm92_exit(void) -{ - i2c_del_driver(&lm92_driver); -} - -MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org>"); -MODULE_DESCRIPTION("LM92/MAX6635 driver"); -MODULE_LICENSE("GPL"); - -module_init(sensors_lm92_init); -module_exit(sensors_lm92_exit); |
