aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/i2c/chips/lm77.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/i2c/chips/lm77.c')
-rw-r--r--drivers/i2c/chips/lm77.c420
1 files changed, 0 insertions, 420 deletions
diff --git a/drivers/i2c/chips/lm77.c b/drivers/i2c/chips/lm77.c
deleted file mode 100644
index b98f4495299..00000000000
--- a/drivers/i2c/chips/lm77.c
+++ /dev/null
@@ -1,420 +0,0 @@
-/*
- 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/i2c-sensor.h>
-
-
-/* Addresses to scan */
-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(lm77);
-
-/* 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 i2c_client client;
- struct semaphore 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_attach_adapter(struct i2c_adapter *adapter);
-static int lm77_detect(struct i2c_adapter *adapter, int address, int kind);
-static void lm77_init_client(struct i2c_client *client);
-static int lm77_detach_client(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);
-
-
-/* This is the driver that will be inserted */
-static struct i2c_driver lm77_driver = {
- .owner = THIS_MODULE,
- .name = "lm77",
- .flags = I2C_DF_NOTIFY,
- .attach_adapter = lm77_attach_adapter,
- .detach_client = lm77_detach_client,
-};
-
-/* 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 u16 LM77_TEMP_TO_REG(int temp)
-{
- int ntemp = SENSORS_LIMIT(temp, LM77_TEMP_MIN, LM77_TEMP_MAX);
- return (u16)((ntemp / 500) * 8);
-}
-
-static inline int LM77_TEMP_FROM_REG(u16 reg)
-{
- return ((int)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);
-show(alarms);
-
-/* 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 = simple_strtoul(buf, NULL, 10); \
- \
- down(&data->update_lock); \
- data->value = val; \
- lm77_write_value(client, reg, LM77_TEMP_TO_REG(data->value)); \
- up(&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 = simple_strtoul(buf, NULL, 10);
-
- down(&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));
- up(&data->update_lock);
- return count;
-}
-
-/* preserve hysteresis when setting T_crit */
-static ssize_t set_temp_crit(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 = simple_strtoul(buf, NULL, 10);
- int oldcrithyst;
-
- down(&data->update_lock);
- oldcrithyst = data->temp_crit - data->temp_hyst;
- data->temp_crit = val;
- data->temp_hyst = data->temp_crit - oldcrithyst;
- lm77_write_value(client, LM77_REG_TEMP_CRIT,
- LM77_TEMP_TO_REG(data->temp_crit));
- lm77_write_value(client, LM77_REG_TEMP_HYST,
- LM77_TEMP_TO_REG(data->temp_hyst));
- up(&data->update_lock);
- return count;
-}
-
-static DEVICE_ATTR(temp1_input, S_IRUGO,
- show_temp_input, NULL);
-static DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO,
- show_temp_crit, set_temp_crit);
-static DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO,
- show_temp_min, set_temp_min);
-static DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
- show_temp_max, set_temp_max);
-
-static DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
- show_temp_crit_hyst, set_temp_crit_hyst);
-static DEVICE_ATTR(temp1_min_hyst, S_IRUGO,
- show_temp_min_hyst, NULL);
-static DEVICE_ATTR(temp1_max_hyst, S_IRUGO,
- show_temp_max_hyst, NULL);
-
-static DEVICE_ATTR(alarms, S_IRUGO,
- show_alarms, NULL);
-
-static int lm77_attach_adapter(struct i2c_adapter *adapter)
-{
- if (!(adapter->class & I2C_CLASS_HWMON))
- return 0;
- return i2c_detect(adapter, &addr_data, lm77_detect);
-}
-
-/* This function is called by i2c_detect */
-static int lm77_detect(struct i2c_adapter *adapter, int address, int kind)
-{
- struct i2c_client *new_client;
- struct lm77_data *data;
- int err = 0;
- const char *name = "";
-
- if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
- I2C_FUNC_SMBUS_WORD_DATA))
- goto exit;
-
- /* 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 lm77_{read,write}_value. */
- if (!(data = kmalloc(sizeof(struct lm77_data), GFP_KERNEL))) {
- err = -ENOMEM;
- goto exit;
- }
- memset(data, 0, sizeof(struct lm77_data));
-
- new_client = &data->client;
- i2c_set_clientdata(new_client, data);
- new_client->addr = address;
- new_client->adapter = adapter;
- new_client->driver = &lm77_driver;
- new_client->flags = 0;
-
- /* Here comes the remaining detection. Since the LM77 has no
- register dedicated to identification, we have to rely on the
- following tricks:
-
- 1. the high 4 bits represent the sign and thus they should
- always be the same
- 2. the high 3 bits are unused in the configuration register
- 3. addresses 0x06 and 0x07 return the last read value
- 4. registers cycling over 8-address boundaries
-
- Word-sized registers are high-byte first. */
- if (kind < 0) {
- int i, cur, conf, hyst, crit, min, max;
-
- /* addresses cycling */
- cur = i2c_smbus_read_word_data(new_client, 0);
- conf = i2c_smbus_read_byte_data(new_client, 1);
- hyst = i2c_smbus_read_word_data(new_client, 2);
- crit = i2c_smbus_read_word_data(new_client, 3);
- min = i2c_smbus_read_word_data(new_client, 4);
- max = i2c_smbus_read_word_data(new_client, 5);
- for (i = 8; i <= 0xff; i += 8)
- if (i2c_smbus_read_byte_data(new_client, i + 1) != conf
- || i2c_smbus_read_word_data(new_client, i + 2) != hyst
- || i2c_smbus_read_word_data(new_client, i + 3) != crit
- || i2c_smbus_read_word_data(new_client, i + 4) != min
- || i2c_smbus_read_word_data(new_client, i + 5) != max)
- goto exit_free;
-
- /* sign bits */
- if (((cur & 0x00f0) != 0xf0 && (cur & 0x00f0) != 0x0)
- || ((hyst & 0x00f0) != 0xf0 && (hyst & 0x00f0) != 0x0)
- || ((crit & 0x00f0) != 0xf0 && (crit & 0x00f0) != 0x0)
- || ((min & 0x00f0) != 0xf0 && (min & 0x00f0) != 0x0)
- || ((max & 0x00f0) != 0xf0 && (max & 0x00f0) != 0x0))
- goto exit_free;
-
- /* unused bits */
- if (conf & 0xe0)
- goto exit_free;
-
- /* 0x06 and 0x07 return the last read value */
- cur = i2c_smbus_read_word_data(new_client, 0);
- if (i2c_smbus_read_word_data(new_client, 6) != cur
- || i2c_smbus_read_word_data(new_client, 7) != cur)
- goto exit_free;
- hyst = i2c_smbus_read_word_data(new_client, 2);
- if (i2c_smbus_read_word_data(new_client, 6) != hyst
- || i2c_smbus_read_word_data(new_client, 7) != hyst)
- goto exit_free;
- min = i2c_smbus_read_word_data(new_client, 4);
- if (i2c_smbus_read_word_data(new_client, 6) != min
- || i2c_smbus_read_word_data(new_client, 7) != min)
- goto exit_free;
-
- }
-
- /* Determine the chip type - only one kind supported! */
- if (kind <= 0)
- kind = lm77;
-
- if (kind == lm77) {
- name = "lm77";
- }
-
- /* Fill in the remaining client fields and put it into the global list */
- 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 LM77 chip */
- lm77_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_min);
- device_create_file(&new_client->dev, &dev_attr_temp1_max);
- device_create_file(&new_client->dev, &dev_attr_temp1_crit_hyst);
- device_create_file(&new_client->dev, &dev_attr_temp1_min_hyst);
- 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 lm77_detach_client(struct i2c_client *client)
-{
- i2c_detach_client(client);
- kfree(i2c_get_clientdata(client));
- return 0;
-}
-
-/* All registers are word-sized, except for the configuration register.
- The LM77 uses the high-byte first convention. */
-static u16 lm77_read_value(struct i2c_client *client, u8 reg)
-{
- if (reg == LM77_REG_CONF)
- return i2c_smbus_read_byte_data(client, reg);
- else
- return swab16(i2c_smbus_read_word_data(client, reg));
-}
-
-static int lm77_write_value(struct i2c_client *client, u8 reg, u16 value)
-{
- if (reg == LM77_REG_CONF)
- return i2c_smbus_write_byte_data(client, reg, value);
- else
- return i2c_smbus_write_word_data(client, reg, swab16(value));
-}
-
-static void lm77_init_client(struct i2c_client *client)
-{
- /* Initialize the LM77 chip - turn off shutdown mode */
- int conf = lm77_read_value(client, LM77_REG_CONF);
- if (conf & 1)
- lm77_write_value(client, LM77_REG_CONF, conf & 0xfe);
-}
-
-static struct lm77_data *lm77_update_device(struct device *dev)
-{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm77_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 lm77 update\n");
- data->temp_input =
- LM77_TEMP_FROM_REG(lm77_read_value(client,
- LM77_REG_TEMP));
- data->temp_hyst =
- LM77_TEMP_FROM_REG(lm77_read_value(client,
- LM77_REG_TEMP_HYST));
- data->temp_crit =
- LM77_TEMP_FROM_REG(lm77_read_value(client,
- LM77_REG_TEMP_CRIT));
- data->temp_min =
- LM77_TEMP_FROM_REG(lm77_read_value(client,
- LM77_REG_TEMP_MIN));
- data->temp_max =
- LM77_TEMP_FROM_REG(lm77_read_value(client,
- LM77_REG_TEMP_MAX));
- data->alarms =
- lm77_read_value(client, LM77_REG_TEMP) & 0x0007;
- data->last_updated = jiffies;
- data->valid = 1;
- }
-
- up(&data->update_lock);
-
- return data;
-}
-
-static int __init sensors_lm77_init(void)
-{
- return i2c_add_driver(&lm77_driver);
-}
-
-static void __exit sensors_lm77_exit(void)
-{
- i2c_del_driver(&lm77_driver);
-}
-
-MODULE_AUTHOR("Andras BALI <drewie@freemail.hu>");
-MODULE_DESCRIPTION("LM77 driver");
-MODULE_LICENSE("GPL");
-
-module_init(sensors_lm77_init);
-module_exit(sensors_lm77_exit);
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-19 03:17:47 +0000