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hwmon/lm78: No longer use i2c-isa
Reimplement the ISA device support as a platform driver, so that we no longer rely on i2c-isa. Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare
Jean Delvare
parent
d20620de0c
commit
c40769fee1
@ -291,7 +291,6 @@ config SENSORS_LM77
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config SENSORS_LM78
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tristate "National Semiconductor LM78 and compatibles"
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depends on HWMON && I2C
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select I2C_ISA
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select HWMON_VID
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help
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If you say yes here you get support for National Semiconductor LM78,
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@ -2,6 +2,7 @@
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lm78.c - Part of lm_sensors, Linux kernel modules for hardware
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monitoring
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Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl>
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Copyright (c) 2007 Jean Delvare <khali@linux-fr.org>
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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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@ -23,13 +24,17 @@
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/i2c.h>
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#include <linux/i2c-isa.h>
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#include <linux/platform_device.h>
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#include <linux/ioport.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-vid.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <asm/io.h>
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/* ISA device, if found */
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static struct platform_device *pdev;
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/* Addresses to scan */
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static unsigned short normal_i2c[] = { 0x20, 0x21, 0x22, 0x23, 0x24,
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0x25, 0x26, 0x27, 0x28, 0x29,
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@ -121,12 +126,8 @@ static inline int TEMP_FROM_REG(s8 val)
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a bit - except if there could be more than one SMBus. Groan. No solution
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for this yet. */
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/* This module may seem overly long and complicated. In fact, it is not so
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bad. Quite a lot of bookkeeping is done. A real driver can often cut
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some corners. */
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/* For each registered chip, we need to keep some data in memory.
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The structure is dynamically allocated. */
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/* For ISA chips, we abuse the i2c_client addr and name fields. We also use
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the driver field to differentiate between I2C and ISA chips. */
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struct lm78_data {
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struct i2c_client client;
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struct class_device *class_dev;
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@ -152,10 +153,12 @@ struct lm78_data {
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static int lm78_attach_adapter(struct i2c_adapter *adapter);
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static int lm78_isa_attach_adapter(struct i2c_adapter *adapter);
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static int lm78_detect(struct i2c_adapter *adapter, int address, int kind);
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static int lm78_detach_client(struct i2c_client *client);
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static int __devinit lm78_isa_probe(struct platform_device *pdev);
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static int __devexit lm78_isa_remove(struct platform_device *pdev);
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static int lm78_read_value(struct i2c_client *client, u8 reg);
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static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value);
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static struct lm78_data *lm78_update_device(struct device *dev);
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@ -171,13 +174,13 @@ static struct i2c_driver lm78_driver = {
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.detach_client = lm78_detach_client,
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};
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static struct i2c_driver lm78_isa_driver = {
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static struct platform_driver lm78_isa_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "lm78-isa",
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.name = "lm78",
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},
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.attach_adapter = lm78_isa_attach_adapter,
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.detach_client = lm78_detach_client,
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.probe = lm78_isa_probe,
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.remove = lm78_isa_remove,
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};
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@ -203,8 +206,8 @@ static ssize_t show_in_max(struct device *dev, char *buf, int nr)
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static ssize_t set_in_min(struct device *dev, const char *buf,
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size_t count, int nr)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm78_data *data = i2c_get_clientdata(client);
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struct lm78_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = &data->client;
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unsigned long val = simple_strtoul(buf, NULL, 10);
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mutex_lock(&data->update_lock);
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@ -217,8 +220,8 @@ static ssize_t set_in_min(struct device *dev, const char *buf,
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static ssize_t set_in_max(struct device *dev, const char *buf,
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size_t count, int nr)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm78_data *data = i2c_get_clientdata(client);
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struct lm78_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = &data->client;
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unsigned long val = simple_strtoul(buf, NULL, 10);
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mutex_lock(&data->update_lock);
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@ -284,8 +287,8 @@ static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr,
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static ssize_t set_temp_over(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm78_data *data = i2c_get_clientdata(client);
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struct lm78_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = &data->client;
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long val = simple_strtol(buf, NULL, 10);
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mutex_lock(&data->update_lock);
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@ -303,8 +306,8 @@ static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr,
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static ssize_t set_temp_hyst(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm78_data *data = i2c_get_clientdata(client);
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struct lm78_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = &data->client;
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long val = simple_strtol(buf, NULL, 10);
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mutex_lock(&data->update_lock);
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@ -338,8 +341,8 @@ static ssize_t show_fan_min(struct device *dev, char *buf, int nr)
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static ssize_t set_fan_min(struct device *dev, const char *buf,
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size_t count, int nr)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm78_data *data = i2c_get_clientdata(client);
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struct lm78_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = &data->client;
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unsigned long val = simple_strtoul(buf, NULL, 10);
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mutex_lock(&data->update_lock);
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@ -362,8 +365,8 @@ static ssize_t show_fan_div(struct device *dev, char *buf, int nr)
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static ssize_t set_fan_div(struct device *dev, const char *buf,
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size_t count, int nr)
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{
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struct i2c_client *client = to_i2c_client(dev);
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struct lm78_data *data = i2c_get_clientdata(client);
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struct lm78_data *data = dev_get_drvdata(dev);
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struct i2c_client *client = &data->client;
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unsigned long val = simple_strtoul(buf, NULL, 10);
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unsigned long min;
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u8 reg;
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@ -378,7 +381,7 @@ static ssize_t set_fan_div(struct device *dev, const char *buf,
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case 4: data->fan_div[nr] = 2; break;
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case 8: data->fan_div[nr] = 3; break;
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default:
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dev_err(&client->dev, "fan_div value %ld not "
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dev_err(dev, "fan_div value %ld not "
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"supported. Choose one of 1, 2, 4 or 8!\n", val);
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mutex_unlock(&data->update_lock);
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return -EINVAL;
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@ -475,11 +478,6 @@ static int lm78_attach_adapter(struct i2c_adapter *adapter)
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return i2c_probe(adapter, &addr_data, lm78_detect);
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}
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static int lm78_isa_attach_adapter(struct i2c_adapter *adapter)
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{
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return lm78_detect(adapter, isa_address, -1);
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}
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static struct attribute *lm78_attributes[] = {
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&dev_attr_in0_input.attr,
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&dev_attr_in0_min.attr,
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@ -524,6 +522,17 @@ static const struct attribute_group lm78_group = {
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.attrs = lm78_attributes,
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};
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/* I2C devices get this name attribute automatically, but for ISA devices
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we must create it by ourselves. */
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static ssize_t show_name(struct device *dev, struct device_attribute
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*devattr, char *buf)
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{
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struct lm78_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%s\n", data->client.name);
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}
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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/* This function is called by i2c_probe */
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static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
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{
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@ -531,54 +540,10 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
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struct i2c_client *new_client;
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struct lm78_data *data;
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const char *client_name = "";
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int is_isa = i2c_is_isa_adapter(adapter);
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if (!is_isa &&
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!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
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if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
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err = -ENODEV;
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goto ERROR0;
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}
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/* Reserve the ISA region */
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if (is_isa)
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if (!request_region(address, LM78_EXTENT,
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lm78_isa_driver.driver.name)) {
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err = -EBUSY;
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goto ERROR0;
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}
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/* Probe whether there is anything available on this address. Already
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done for SMBus clients */
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if (kind < 0) {
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if (is_isa) {
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#define REALLY_SLOW_IO
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/* We need the timeouts for at least some LM78-like
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chips. But only if we read 'undefined' registers. */
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i = inb_p(address + 1);
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if (inb_p(address + 2) != i) {
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err = -ENODEV;
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goto ERROR1;
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}
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if (inb_p(address + 3) != i) {
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err = -ENODEV;
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goto ERROR1;
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}
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if (inb_p(address + 7) != i) {
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err = -ENODEV;
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goto ERROR1;
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}
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#undef REALLY_SLOW_IO
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/* Let's just hope nothing breaks here */
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i = inb_p(address + 5) & 0x7f;
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outb_p(~i & 0x7f, address + 5);
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if ((inb_p(address + 5) & 0x7f) != (~i & 0x7f)) {
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outb_p(i, address + 5);
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err = -ENODEV;
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goto ERROR1;
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}
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}
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goto ERROR1;
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}
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/* OK. For now, we presume we have a valid client. We now create the
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@ -591,13 +556,10 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
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}
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new_client = &data->client;
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if (is_isa)
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mutex_init(&data->lock);
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i2c_set_clientdata(new_client, data);
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new_client->addr = address;
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new_client->adapter = adapter;
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new_client->driver = is_isa ? &lm78_isa_driver : &lm78_driver;
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new_client->flags = 0;
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new_client->driver = &lm78_driver;
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/* Now, we do the remaining detection. */
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if (kind < 0) {
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@ -605,8 +567,8 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
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err = -ENODEV;
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goto ERROR2;
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}
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if (!is_isa && (lm78_read_value(
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new_client, LM78_REG_I2C_ADDR) != address)) {
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if (lm78_read_value(new_client, LM78_REG_I2C_ADDR) !=
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address) {
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err = -ENODEV;
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goto ERROR2;
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}
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@ -641,9 +603,6 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
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strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
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data->type = kind;
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data->valid = 0;
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mutex_init(&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 ERROR2;
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@ -651,12 +610,6 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind)
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/* Initialize the LM78 chip */
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lm78_init_client(new_client);
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/* A few vars need to be filled upon startup */
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for (i = 0; i < 3; i++) {
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data->fan_min[i] = lm78_read_value(new_client,
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LM78_REG_FAN_MIN(i));
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}
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/* Register sysfs hooks */
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if ((err = sysfs_create_group(&new_client->dev.kobj, &lm78_group)))
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goto ERROR3;
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@ -676,9 +629,6 @@ ERROR3:
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ERROR2:
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kfree(data);
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ERROR1:
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if (is_isa)
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release_region(address, LM78_EXTENT);
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ERROR0:
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return err;
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}
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@ -693,9 +643,77 @@ static int lm78_detach_client(struct i2c_client *client)
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if ((err = i2c_detach_client(client)))
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return err;
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if(i2c_is_isa_client(client))
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release_region(client->addr, LM78_EXTENT);
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kfree(data);
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return 0;
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}
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static int __devinit lm78_isa_probe(struct platform_device *pdev)
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{
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int err;
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struct lm78_data *data;
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struct resource *res;
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const char *name;
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/* Reserve the ISA region */
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res = platform_get_resource(pdev, IORESOURCE_IO, 0);
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if (!request_region(res->start, LM78_EXTENT, "lm78")) {
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err = -EBUSY;
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goto exit;
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}
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if (!(data = kzalloc(sizeof(struct lm78_data), GFP_KERNEL))) {
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err = -ENOMEM;
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goto exit_release_region;
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}
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mutex_init(&data->lock);
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data->client.addr = res->start;
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i2c_set_clientdata(&data->client, data);
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platform_set_drvdata(pdev, data);
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if (lm78_read_value(&data->client, LM78_REG_CHIPID) & 0x80) {
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data->type = lm79;
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name = "lm79";
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} else {
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data->type = lm78;
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name = "lm78";
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}
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strlcpy(data->client.name, name, I2C_NAME_SIZE);
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/* Initialize the LM78 chip */
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lm78_init_client(&data->client);
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/* Register sysfs hooks */
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if ((err = sysfs_create_group(&pdev->dev.kobj, &lm78_group))
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|| (err = device_create_file(&pdev->dev, &dev_attr_name)))
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goto exit_remove_files;
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data->class_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->class_dev)) {
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err = PTR_ERR(data->class_dev);
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goto exit_remove_files;
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}
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return 0;
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exit_remove_files:
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sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
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device_remove_file(&pdev->dev, &dev_attr_name);
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kfree(data);
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exit_release_region:
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release_region(res->start, LM78_EXTENT);
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exit:
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return err;
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}
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static int __devexit lm78_isa_remove(struct platform_device *pdev)
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{
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struct lm78_data *data = platform_get_drvdata(pdev);
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hwmon_device_unregister(data->class_dev);
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sysfs_remove_group(&pdev->dev.kobj, &lm78_group);
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device_remove_file(&pdev->dev, &dev_attr_name);
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release_region(data->client.addr, LM78_EXTENT);
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kfree(data);
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return 0;
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@ -709,7 +727,7 @@ static int lm78_detach_client(struct i2c_client *client)
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static int lm78_read_value(struct i2c_client *client, u8 reg)
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{
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int res;
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if (i2c_is_isa_client(client)) {
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if (!client->driver) { /* ISA device */
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struct lm78_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->lock);
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outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
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@ -729,7 +747,7 @@ static int lm78_read_value(struct i2c_client *client, u8 reg)
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nowhere else be necessary! */
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static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value)
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{
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if (i2c_is_isa_client(client)) {
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if (!client->driver) { /* ISA device */
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struct lm78_data *data = i2c_get_clientdata(client);
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mutex_lock(&data->lock);
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outb_p(reg, client->addr + LM78_ADDR_REG_OFFSET);
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@ -742,18 +760,29 @@ static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value)
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static void lm78_init_client(struct i2c_client *client)
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{
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u8 config = lm78_read_value(client, LM78_REG_CONFIG);
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struct lm78_data *data = i2c_get_clientdata(client);
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u8 config;
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int i;
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/* Start monitoring */
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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);
|
||||
@ -761,7 +790,7 @@ static struct lm78_data *lm78_update_device(struct device *dev)
|
||||
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] =
|
||||
@ -805,26 +834,154 @@ static struct lm78_data *lm78_update_device(struct device *dev)
|
||||
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;
|
||||
|
||||
/* 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;
|
||||
if (lm78_isa_found(isa_address)) {
|
||||
res = platform_driver_register(&lm78_isa_driver);
|
||||
if (res)
|
||||
goto exit_unreg_i2c_driver;
|
||||
|
||||
/* 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);
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user