lm78.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring
Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
+ Copyright (c) 2007 Jean Delvare <khali@linux-fr.org>
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
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
-#include <linux/i2c-isa.h>
+#include <linux/platform_device.h>
+#include <linux/ioport.h>
#include <linux/hwmon.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <asm/io.h>
+/* ISA device, if found */
+static struct platform_device *pdev;
+
/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
0x25, 0x26, 0x27, 0x28, 0x29,
a bit - except if there could be more than one SMBus. Groan. No solution
for this yet. */
-/* This module may seem overly long and complicated. In fact, it is not so
- bad. Quite a lot of bookkeeping is done. A real driver can often cut
- some corners. */
-
-/* For each registered chip, we need to keep some data in memory.
- The structure is dynamically allocated. */
+/* For ISA chips, we abuse the i2c_client addr and name fields. We also use
+ the driver field to differentiate between I2C and ISA chips. */
struct lm78_data {
struct i2c_client client;
struct class_device *class_dev;
static int lm78_attach_adapter(struct i2c_adapter *adapter);
-static int lm78_isa_attach_adapter(struct i2c_adapter *adapter);
static int lm78_detect(struct i2c_adapter *adapter, int address, int kind);
static int lm78_detach_client(struct i2c_client *client);
+static int __devinit lm78_isa_probe(struct platform_device *pdev);
+static int __devexit lm78_isa_remove(struct platform_device *pdev);
+
static int lm78_read_value(struct i2c_client *client, u8 reg);
static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value);
static struct lm78_data *lm78_update_device(struct device *dev);
.detach_client = lm78_detach_client,
};
-static struct i2c_driver lm78_isa_driver = {
+static struct platform_driver lm78_isa_driver = {
.driver = {
.owner = THIS_MODULE,
- .name = "lm78-isa",
+ .name = "lm78",
},
- .attach_adapter = lm78_isa_attach_adapter,
- .detach_client = lm78_detach_client,
+ .probe = lm78_isa_probe,
+ .remove = lm78_isa_remove,
};
static ssize_t set_in_min(struct device *dev, const char *buf,
size_t count, int nr)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm78_data *data = i2c_get_clientdata(client);
+ struct lm78_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = &data->client;
unsigned long val = simple_strtoul(buf, NULL, 10);
mutex_lock(&data->update_lock);
static ssize_t set_in_max(struct device *dev, const char *buf,
size_t count, int nr)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm78_data *data = i2c_get_clientdata(client);
+ struct lm78_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = &data->client;
unsigned long val = simple_strtoul(buf, NULL, 10);
mutex_lock(&data->update_lock);
static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm78_data *data = i2c_get_clientdata(client);
+ struct lm78_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = &data->client;
long val = simple_strtol(buf, NULL, 10);
mutex_lock(&data->update_lock);
static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm78_data *data = i2c_get_clientdata(client);
+ struct lm78_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = &data->client;
long val = simple_strtol(buf, NULL, 10);
mutex_lock(&data->update_lock);
static ssize_t set_fan_min(struct device *dev, const char *buf,
size_t count, int nr)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm78_data *data = i2c_get_clientdata(client);
+ struct lm78_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = &data->client;
unsigned long val = simple_strtoul(buf, NULL, 10);
mutex_lock(&data->update_lock);
static ssize_t set_fan_div(struct device *dev, const char *buf,
size_t count, int nr)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm78_data *data = i2c_get_clientdata(client);
+ struct lm78_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = &data->client;
unsigned long val = simple_strtoul(buf, NULL, 10);
unsigned long min;
u8 reg;
case 4: data->fan_div[nr] = 2; break;
case 8: data->fan_div[nr] = 3; break;
default:
- dev_err(&client->dev, "fan_div value %ld not "
+ dev_err(dev, "fan_div value %ld not "
"supported. Choose one of 1, 2, 4 or 8!\n", val);
mutex_unlock(&data->update_lock);
return -EINVAL;
return i2c_probe(adapter, &addr_data, lm78_detect);
}
-static int lm78_isa_attach_adapter(struct i2c_adapter *adapter)
-{
- return lm78_detect(adapter, isa_address, -1);
-}
-
static struct attribute *lm78_attributes[] = {
&dev_attr_in0_input.attr,
&dev_attr_in0_min.attr,
.attrs = lm78_attributes,
};
+/* I2C devices get this name attribute automatically, but for ISA devices
+ we must create it by ourselves. */
+static ssize_t show_name(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct lm78_data *data = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%s\n", data->client.name);
+}
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
/* This function is called by i2c_probe */
static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
{
struct i2c_client *new_client;
struct lm78_data *data;
const char *client_name = "";
- int is_isa = i2c_is_isa_adapter(adapter);
- if (!is_isa &&
- !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
err = -ENODEV;
- goto ERROR0;
- }
-
- /* Reserve the ISA region */
- if (is_isa)
- if (!request_region(address, LM78_EXTENT,
- lm78_isa_driver.driver.name)) {
- err = -EBUSY;
- goto ERROR0;
- }
-
- /* Probe whether there is anything available on this address. Already
- done for SMBus clients */
- if (kind < 0) {
- if (is_isa) {
-
-#define REALLY_SLOW_IO
- /* We need the timeouts for at least some LM78-like
- chips. But only if we read 'undefined' registers. */
- i = inb_p(address + 1);
- if (inb_p(address + 2) != i) {
- err = -ENODEV;
- goto ERROR1;
- }
- if (inb_p(address + 3) != i) {
- err = -ENODEV;
- goto ERROR1;
- }
- if (inb_p(address + 7) != i) {
- err = -ENODEV;
- goto ERROR1;
- }
-#undef REALLY_SLOW_IO
-
- /* Let's just hope nothing breaks here */
- i = inb_p(address + 5) & 0x7f;
- outb_p(~i & 0x7f, address + 5);
- if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
- outb_p(i, address + 5);
- err = -ENODEV;
- goto ERROR1;
- }
- }
+ goto ERROR1;
}
/* OK. For now, we presume we have a valid client. We now create the
}
new_client = &data->client;
- if (is_isa)
- mutex_init(&data->lock);
i2c_set_clientdata(new_client, data);
new_client->addr = address;
new_client->adapter = adapter;
- new_client->driver = is_isa ? &lm78_isa_driver : &lm78_driver;
- new_client->flags = 0;
+ new_client->driver = &lm78_driver;
/* Now, we do the remaining detection. */
if (kind < 0) {
err = -ENODEV;
goto ERROR2;
}
- if (!is_isa && (lm78_read_value(
- new_client, LM78_REG_I2C_ADDR) != address)) {
+ if (lm78_read_value(new_client, LM78_REG_I2C_ADDR) !=
+ address) {
err = -ENODEV;
goto ERROR2;
}
strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
data->type = kind;
- data->valid = 0;
- mutex_init(&data->update_lock);
-
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(new_client)))
goto ERROR2;
/* Initialize the LM78 chip */
lm78_init_client(new_client);
- /* A few vars need to be filled upon startup */
- for (i = 0; i < 3; i++) {
- data->fan_min[i] = lm78_read_value(new_client,
- LM78_REG_FAN_MIN(i));
- }
-
/* Register sysfs hooks */
if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group)))
goto ERROR3;
ERROR2:
kfree(data);
ERROR1:
- if (is_isa)
- release_region(address, LM78_EXTENT);
-ERROR0:
return err;
}
if ((err = i2c_detach_client(client)))
return err;
- if(i2c_is_isa_client(client))
- release_region(client->addr, LM78_EXTENT);
+ kfree(data);
+
+ return 0;
+}
+
+static int __devinit lm78_isa_probe(struct platform_device *pdev)
+{
+ int err;
+ struct lm78_data *data;
+ struct resource *res;
+ const char *name;
+
+ /* Reserve the ISA region */
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!request_region(res->start, LM78_EXTENT, "lm78")) {
+ err = -EBUSY;
+ goto exit;
+ }
+
+ if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
+ err = -ENOMEM;
+ goto exit_release_region;
+ }
+ mutex_init(&data->lock);
+ data->client.addr = res->start;
+ i2c_set_clientdata(&data->client, data);
+ platform_set_drvdata(pdev, data);
+
+ if (lm78_read_value(&data->client, LM78_REG_CHIPID) & 0x80) {
+ data->type = lm79;
+ name = "lm79";
+ } else {
+ data->type = lm78;
+ name = "lm78";
+ }
+ strlcpy(data->client.name, name, I2C_NAME_SIZE);
+
+ /* Initialize the LM78 chip */
+ lm78_init_client(&data->client);
+
+ /* Register sysfs hooks */
+ if ((err = sysfs_create_group(&pdev->dev.kobj, &lm78_group))
+ || (err = device_create_file(&pdev->dev, &dev_attr_name)))
+ goto exit_remove_files;
+
+ data->class_dev = hwmon_device_register(&pdev->dev);
+ if (IS_ERR(data->class_dev)) {
+ err = PTR_ERR(data->class_dev);
+ goto exit_remove_files;
+ }
+
+ return 0;
+
+ exit_remove_files:
+ sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
+ device_remove_file(&pdev->dev, &dev_attr_name);
+ kfree(data);
+ exit_release_region:
+ release_region(res->start, LM78_EXTENT);
+ exit:
+ return err;
+}
+
+static int __devexit lm78_isa_remove(struct platform_device *pdev)
+{
+ struct lm78_data *data = platform_get_drvdata(pdev);
+ hwmon_device_unregister(data->class_dev);
+ sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
+ device_remove_file(&pdev->dev, &dev_attr_name);
+ release_region(data->client.addr, LM78_EXTENT);
kfree(data);
return 0;
static int lm78_read_value(struct i2c_client *client, u8 reg)
{
int res;
- if (i2c_is_isa_client(client)) {
+ if (!client->driver) { /* ISA device */
struct lm78_data *data = i2c_get_clientdata(client);
mutex_lock(&data->lock);
outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
nowhere else be necessary! */
static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value)
{
- if (i2c_is_isa_client(client)) {
+ if (!client->driver) { /* ISA device */
struct lm78_data *data = i2c_get_clientdata(client);
mutex_lock(&data->lock);
outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
static void lm78_init_client(struct i2c_client *client)
{
- u8 config = lm78_read_value(client, LM78_REG_CONFIG);
+ struct lm78_data *data = i2c_get_clientdata(client);
+ u8 config;
+ int i;
/* Start monitoring */
- if (!(config & 0x01))
+ config = lm78_read_value(client, LM78_REG_CONFIG);
+ if ((config & 0x09) != 0x01)
lm78_write_value(client, LM78_REG_CONFIG,
(config & 0xf7) | 0x01);
+
+ /* A few vars need to be filled upon startup */
+ for (i = 0; i < 3; i++) {
+ data->fan_min[i] = lm78_read_value(client,
+ LM78_REG_FAN_MIN(i));
+ }
+
+ mutex_init(&data->update_lock);
}
static struct lm78_data *lm78_update_device(struct device *dev)
{
- struct i2c_client *client = to_i2c_client(dev);
- struct lm78_data *data = i2c_get_clientdata(client);
+ struct lm78_data *data = dev_get_drvdata(dev);
+ struct i2c_client *client = &data->client;
int i;
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
- dev_dbg(&client->dev, "Starting lm78 update\n");
+ dev_dbg(dev, "Starting lm78 update\n");
for (i = 0; i <= 6; i++) {
data->in[i] =
return data;
}
+/* return 1 if a supported chip is found, 0 otherwise */
+static int __init lm78_isa_found(unsigned short address)
+{
+ int val, save, found = 0;
+
+ if (!request_region(address, LM78_EXTENT, "lm78"))
+ return 0;
+
+#define REALLY_SLOW_IO
+ /* We need the timeouts for at least some LM78-like
+ chips. But only if we read 'undefined' registers. */
+ val = inb_p(address + 1);
+ if (inb_p(address + 2) != val
+ || inb_p(address + 3) != val
+ || inb_p(address + 7) != val)
+ goto release;
+#undef REALLY_SLOW_IO
+
+ /* We should be able to change the 7 LSB of the address port. The
+ MSB (busy flag) should be clear initially, set after the write. */
+ save = inb_p(address + LM78_ADDR_REG_OFFSET);
+ if (save & 0x80)
+ goto release;
+ val = ~save & 0x7f;
+ outb_p(val, address + LM78_ADDR_REG_OFFSET);
+ if (inb_p(address + LM78_ADDR_REG_OFFSET) != (val | 0x80)) {
+ outb_p(save, address + LM78_ADDR_REG_OFFSET);
+ goto release;
+ }
+
+ /* We found a device, now see if it could be an LM78 */
+ outb_p(LM78_REG_CONFIG, address + LM78_ADDR_REG_OFFSET);
+ val = inb_p(address + LM78_DATA_REG_OFFSET);
+ if (val & 0x80)
+ goto release;
+ outb_p(LM78_REG_I2C_ADDR, address + LM78_ADDR_REG_OFFSET);
+ val = inb_p(address + LM78_DATA_REG_OFFSET);
+ if (val < 0x03 || val > 0x77) /* Not a valid I2C address */
+ goto release;
+
+ /* The busy flag should be clear again */
+ if (inb_p(address + LM78_ADDR_REG_OFFSET) & 0x80)
+ goto release;
+
+ /* Explicitly prevent the misdetection of Winbond chips */
+ outb_p(0x4f, address + LM78_ADDR_REG_OFFSET);
+ val = inb_p(address + LM78_DATA_REG_OFFSET);
+ if (val == 0xa3 || val == 0x5c)
+ goto release;
+
+ /* Explicitly prevent the misdetection of ITE chips */
+ outb_p(0x58, address + LM78_ADDR_REG_OFFSET);
+ val = inb_p(address + LM78_DATA_REG_OFFSET);
+ if (val == 0x90)
+ goto release;
+
+ /* Determine the chip type */
+ outb_p(LM78_REG_CHIPID, address + LM78_ADDR_REG_OFFSET);
+ val = inb_p(address + LM78_DATA_REG_OFFSET);
+ if (val == 0x00 /* LM78 */
+ || val == 0x40 /* LM78-J */
+ || (val & 0xfe) == 0xc0) /* LM79 */
+ found = 1;
+
+ if (found)
+ pr_info("lm78: Found an %s chip at %#x\n",
+ val & 0x80 ? "LM79" : "LM78", (int)address);
+
+ release:
+ release_region(address, LM78_EXTENT);
+ return found;
+}
+
+static int __init lm78_isa_device_add(unsigned short address)
+{
+ struct resource res = {
+ .start = address,
+ .end = address + LM78_EXTENT,
+ .name = "lm78",
+ .flags = IORESOURCE_IO,
+ };
+ int err;
+
+ pdev = platform_device_alloc("lm78", address);
+ if (!pdev) {
+ err = -ENOMEM;
+ printk(KERN_ERR "lm78: Device allocation failed\n");
+ goto exit;
+ }
+
+ err = platform_device_add_resources(pdev, &res, 1);
+ if (err) {
+ printk(KERN_ERR "lm78: Device resource addition failed "
+ "(%d)\n", err);
+ goto exit_device_put;
+ }
+
+ err = platform_device_add(pdev);
+ if (err) {
+ printk(KERN_ERR "lm78: Device addition failed (%d)\n",
+ err);
+ goto exit_device_put;
+ }
+
+ return 0;
+
+ exit_device_put:
+ platform_device_put(pdev);
+ exit:
+ pdev = NULL;
+ return err;
+}
+
static int __init sm_lm78_init(void)
{
int res;
res = i2c_add_driver(&lm78_driver);
if (res)
- return res;
+ goto exit;
+
+ if (lm78_isa_found(isa_address)) {
+ res = platform_driver_register(&lm78_isa_driver);
+ if (res)
+ goto exit_unreg_i2c_driver;
- /* Don't exit if this one fails, we still want the I2C variants
- to work! */
- if (i2c_isa_add_driver(&lm78_isa_driver))
- isa_address = 0;
+ /* Sets global pdev as a side effect */
+ res = lm78_isa_device_add(isa_address);
+ if (res)
+ goto exit_unreg_isa_driver;
+ }
return 0;
+
+ exit_unreg_isa_driver:
+ platform_driver_unregister(&lm78_isa_driver);
+ exit_unreg_i2c_driver:
+ i2c_del_driver(&lm78_driver);
+ exit:
+ return res;
}
static void __exit sm_lm78_exit(void)
{
- if (isa_address)
- i2c_isa_del_driver(&lm78_isa_driver);
+ if (pdev) {
+ platform_device_unregister(pdev);
+ platform_driver_unregister(&lm78_isa_driver);
+ }
i2c_del_driver(&lm78_driver);
}
projects / linux-2.6 / commitdiff