litmus-rt.git - The LITMUS^RT kernel.

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/* * lm77.c - Part of lm_sensors, Linux kernel modules for hardware * monitoring * * Copyright (c) 2004 Andras BALI <drewie@freemail.hu> * * Heavily based on lm75.c by Frodo Looijaard <frodol@dds.nl>. The LM77 * is a temperature sensor and thermal window comparator with 0.5 deg * resolution made by National Semiconductor. Complete datasheet can be * obtained at their site: * http://www.national.com/pf/LM/LM77.html * * 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/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> /* Addresses to scan */ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, I2C_CLIENT_END }; /* The LM77 registers */ #define LM77_REG_TEMP 0x00 #define LM77_REG_CONF 0x01 #define LM77_REG_TEMP_HYST 0x02 #define LM77_REG_TEMP_CRIT 0x03 #define LM77_REG_TEMP_MIN 0x04 #define LM77_REG_TEMP_MAX 0x05 /* Each client has this additional data */ struct lm77_data { struct device *hwmon_dev; struct mutex update_lock; char valid; unsigned long last_updated; /* In jiffies */ int temp_input; /* Temperatures */ int temp_crit; int temp_min; int temp_max; int temp_hyst; u8 alarms; }; static int lm77_probe(struct i2c_client *client, const struct i2c_device_id *id); static int lm77_detect(struct i2c_client *client, struct i2c_board_info *info); static void lm77_init_client(struct i2c_client *client); static int lm77_remove(struct i2c_client *client); static u16 lm77_read_value(struct i2c_client *client, u8 reg); static int lm77_write_value(struct i2c_client *client, u8 reg, u16 value); static struct lm77_data *lm77_update_device(struct device *dev); static const struct i2c_device_id lm77_id[] = { { "lm77", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, lm77_id); /* This is the driver that will be inserted */ static struct i2c_driver lm77_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "lm77", }, .probe = lm77_probe, .remove = lm77_remove, .id_table = lm77_id, .detect = lm77_detect, .address_list = normal_i2c, }; /* straight from the datasheet */ #define LM77_TEMP_MIN (-55000) #define LM77_TEMP_MAX 125000 /* * In the temperature registers, the low 3 bits are not part of the * temperature values; they are the status bits. */ static inline s16 LM77_TEMP_TO_REG(int temp) { int ntemp = SENSORS_LIMIT(temp, LM77_TEMP_MIN, LM77_TEMP_MAX); return (ntemp / 500) * 8; } static inline int LM77_TEMP_FROM_REG(s16 reg) { return (reg / 8) * 500; } /* sysfs stuff */ /* read routines for temperature limits */ #define show(value) \ static ssize_t show_##value(struct device *dev, \ struct device_attribute *attr, \ char *buf) \ { \ struct lm77_data *data = lm77_update_device(dev); \ return sprintf(buf, "%d\n", data->value); \ } show(temp_input); show(temp_crit); show(temp_min); show(temp_max); /* read routines for hysteresis values */ static ssize_t show_temp_crit_hyst(struct device *dev, struct device_attribute *attr, char *buf) { struct lm77_data *data = lm77_update_device(dev); return sprintf(buf, "%d\n", data->temp_crit - data->temp_hyst); } static ssize_t show_temp_min_hyst(struct device *dev, struct device_attribute *attr, char *buf) { struct lm77_data *data = lm77_update_device(dev); return sprintf(buf, "%d\n", data->temp_min + data->temp_hyst); } static ssize_t show_temp_max_hyst(struct device *dev, struct device_attribute *attr, char *buf) { struct lm77_data *data = lm77_update_device(dev); return sprintf(buf, "%d\n", data->temp_max - data->temp_hyst); } /* write routines */ #define set(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 lm77_data *data = i2c_get_clientdata(client); \ long val; \ int err = kstrtol(buf, 10, &val); \ if (err) \ return err; \ \ mutex_lock(&data->update_lock); \ data->value = val; \ lm77_write_value(client, reg, LM77_TEMP_TO_REG(data->value)); \ mutex_unlock(&data->update_lock); \ return count; \ } set(temp_min, LM77_REG_TEMP_MIN); set(temp_max, LM77_REG_TEMP_MAX); /* * hysteresis is stored as a relative value on the chip, so it has to be * converted first */ static ssize_t set_temp_crit_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct lm77_data *data = i2c_get_clientdata(client); unsigned long val; int err; err = kstrtoul(buf, 10, &val); if (err) return err; mutex_lock(&data->update_lock); data->temp_hyst = data->temp_crit - val; lm77_write_value(client, LM77_REG_TEMP_HYST, LM77_TEMP_TO_REG(data->temp_hyst)); mutex_unlock(&data->update_lock); return count; }


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