mirror of
https://github.com/lm-sensors/lm-sensors.git
synced 2026-10-15 10:39:31 +00:00
Jean Delvare
239b3d0344
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2445 7894878c-1315-0410-8ee3-d5d059ff63e0
318 lines
8.7 KiB
C
318 lines
8.7 KiB
C
/*
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ltc1710.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 1999 Frodo Looijaard <frodol@dds.nl> and
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Philip Edelbrock <phil@netroedge.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/* A few notes about the LTC1710:
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* The LTC1710 is a dual programmable switch. It can be used to turn
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anything on or off anything which consumes less than 300mA of
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current and up to 5.5V
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* The LTC1710 is a very, very simple SMBus device with three possible
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SMBus addresses (0x58,0x59, or 0x5A). Only SMBus byte writes
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(command writes) are supported.
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* Since only writes are supported, READS DON'T WORK! The device
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plays dead in the event of a read, so this makes detection a
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bit tricky.
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* BTW- I can safely say that this driver has been tested under
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every possible case, so there should be no bugs. :')
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--Phil
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/i2c-proc.h>
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#include <linux/init.h>
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#include "version.h"
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MODULE_LICENSE("GPL");
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { SENSORS_I2C_END };
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static unsigned short normal_i2c_range[] = { 0x58, 0x5a, SENSORS_I2C_END };
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static unsigned int normal_isa[] = { SENSORS_ISA_END };
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static unsigned int normal_isa_range[] = { SENSORS_ISA_END };
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/* Insmod parameters */
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SENSORS_INSMOD_1(ltc1710);
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/* The LTC1710 registers */
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/* (No registers. [Wow! This thing is SIMPLE!] ) */
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/* Initial values */
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#define LTC1710_INIT 0 /* Both off */
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/* Each client has this additional data */
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struct ltc1710_data {
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struct i2c_client client;
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int sysctl_id;
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struct semaphore update_lock;
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char valid; /* !=0 if following fields are valid */
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unsigned long last_updated; /* In jiffies */
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u8 status; /* Register values */
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};
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static int ltc1710_attach_adapter(struct i2c_adapter *adapter);
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static int ltc1710_detect(struct i2c_adapter *adapter, int address,
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unsigned short flags, int kind);
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static int ltc1710_detach_client(struct i2c_client *client);
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static void ltc1710_switch1(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void ltc1710_switch2(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results);
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static void ltc1710_update_client(struct i2c_client *client);
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/* This is the driver that will be inserted */
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static struct i2c_driver ltc1710_driver = {
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.owner = THIS_MODULE,
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.name = "LTC1710 sensor chip driver",
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.id = I2C_DRIVERID_LTC1710,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = ltc1710_attach_adapter,
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.detach_client = ltc1710_detach_client,
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};
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/* -- SENSORS SYSCTL START -- */
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#define LTC1710_SYSCTL_SWITCH_1 1000
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#define LTC1710_SYSCTL_SWITCH_2 1001
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/* -- SENSORS SYSCTL END -- */
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/* These files are created for each detected LTC1710. This is just a template;
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though at first sight, you might think we could use a statically
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allocated list, we need some way to get back to the parent - which
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is done through one of the 'extra' fields which are initialized
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when a new copy is allocated. */
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static ctl_table ltc1710_dir_table_template[] = {
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{LTC1710_SYSCTL_SWITCH_1, "switch1", NULL, 0, 0644, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, <c1710_switch1},
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{LTC1710_SYSCTL_SWITCH_2, "switch2", NULL, 0, 0644, NULL, &i2c_proc_real,
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&i2c_sysctl_real, NULL, <c1710_switch2},
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{0}
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};
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static int ltc1710_id = 0;
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static int ltc1710_attach_adapter(struct i2c_adapter *adapter)
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{
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return i2c_detect(adapter, &addr_data, ltc1710_detect);
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}
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/* This function is called by i2c_detect */
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int ltc1710_detect(struct i2c_adapter *adapter, int address,
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unsigned short flags, int kind)
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{
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int i;
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struct i2c_client *new_client;
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struct ltc1710_data *data;
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int err = 0;
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const char *type_name, *client_name;
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/* Make sure we aren't probing the ISA bus!! This is just a safety check
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at this moment; i2c_detect really won't call us. */
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#ifdef DEBUG
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if (i2c_is_isa_adapter(adapter)) {
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printk
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("ltc1710.o: ltc1710_detect called for an ISA bus adapter?!?\n");
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return 0;
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}
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#endif
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
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goto ERROR0;
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/* OK. For now, we presume we have a valid client. We now create the
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client structure, even though we cannot fill it completely yet.
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But it allows us to access ltc1710_{read,write}_value. */
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if (!(data = kmalloc(sizeof(struct ltc1710_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto ERROR0;
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}
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new_client = &data->client;
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new_client->addr = address;
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new_client->data = data;
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new_client->adapter = adapter;
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new_client->driver = <c1710_driver;
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new_client->flags = 0;
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/* Now, we would do the remaining detection. But the LTC1710 is plainly
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impossible to detect! Stupid chip. */
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/* Determine the chip type - only one kind supported! */
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if (kind <= 0)
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kind = ltc1710;
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if (kind == ltc1710) {
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type_name = "ltc1710";
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client_name = "LTC1710 chip";
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} else {
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#ifdef DEBUG
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printk("ltc1710.o: Internal error: unknown kind (%d)?!?",
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kind);
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#endif
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goto ERROR1;
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}
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/* Fill in the remaining client fields and put it into the global list */
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strcpy(new_client->name, client_name);
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new_client->id = ltc1710_id++;
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data->valid = 0;
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init_MUTEX(&data->update_lock);
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/* Tell the I2C layer a new client has arrived */
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if ((err = i2c_attach_client(new_client)))
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goto ERROR3;
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/* Register a new directory entry with module sensors */
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if ((i = i2c_register_entry(new_client, type_name,
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ltc1710_dir_table_template)) < 0) {
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err = i;
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goto ERROR4;
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}
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data->sysctl_id = i;
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return 0;
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/* OK, this is not exactly good programming practice, usually. But it is
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very code-efficient in this case. */
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ERROR4:
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i2c_detach_client(new_client);
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ERROR3:
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ERROR1:
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kfree(data);
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ERROR0:
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return err;
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}
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static int ltc1710_detach_client(struct i2c_client *client)
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{
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int err;
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i2c_deregister_entry(((struct ltc1710_data *) (client->data))->
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sysctl_id);
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if ((err = i2c_detach_client(client))) {
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printk
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("ltc1710.o: Client deregistration failed, client not detached.\n");
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return err;
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}
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kfree(client->data);
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return 0;
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}
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static void ltc1710_update_client(struct i2c_client *client)
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{
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struct ltc1710_data *data = client->data;
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down(&data->update_lock);
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if ((jiffies - data->last_updated > HZ + HZ / 2) ||
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(jiffies < data->last_updated) || !data->valid) {
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#ifdef DEBUG
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printk("Starting ltc1710 update\n");
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#endif
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/* data->status = i2c_smbus_read_byte(client);
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Unfortunately, reads always fail! */
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data->last_updated = jiffies;
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data->valid = 1;
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}
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up(&data->update_lock);
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}
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void ltc1710_switch1(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results)
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{
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struct ltc1710_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ) {
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ltc1710_update_client(client);
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results[0] = data->status & 1;
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*nrels_mag = 1;
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} else if (operation == SENSORS_PROC_REAL_WRITE) {
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if (*nrels_mag >= 1) {
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data->status = (data->status & 2) | results[0];
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i2c_smbus_write_byte(client, data->status);
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}
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}
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}
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void ltc1710_switch2(struct i2c_client *client, int operation,
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int ctl_name, int *nrels_mag, long *results)
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{
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struct ltc1710_data *data = client->data;
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if (operation == SENSORS_PROC_REAL_INFO)
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*nrels_mag = 0;
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else if (operation == SENSORS_PROC_REAL_READ) {
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ltc1710_update_client(client);
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results[0] = (data->status & 2) >> 1;
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*nrels_mag = 1;
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} else if (operation == SENSORS_PROC_REAL_WRITE) {
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if (*nrels_mag >= 1) {
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data->status =
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(data->status & 1) | (results[0] << 1);
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i2c_smbus_write_byte(client, data->status);
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}
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}
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}
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static int __init sm_ltc1710_init(void)
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{
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printk("ltc1710.o version %s (%s)\n", LM_VERSION, LM_DATE);
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return i2c_add_driver(<c1710_driver);
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}
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static void __exit sm_ltc1710_exit(void)
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{
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i2c_del_driver(<c1710_driver);
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}
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MODULE_AUTHOR
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("Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com>");
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MODULE_DESCRIPTION("LTC1710 driver");
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module_init(sm_ltc1710_init);
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module_exit(sm_ltc1710_exit);
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