diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/hwmon/lm78.c | 377 |
2 files changed, 267 insertions, 111 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index d89bd5e..659a2abb 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -291,7 +291,6 @@ config SENSORS_LM77 config SENSORS_LM78 tristate "National Semiconductor LM78 and compatibles" depends on HWMON && I2C - select I2C_ISA select HWMON_VID help If you say yes here you get support for National Semiconductor LM78, diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c index 886786c..cfb0897 100644 --- a/drivers/hwmon/lm78.c +++ b/drivers/hwmon/lm78.c @@ -2,6 +2,7 @@ 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 @@ -23,13 +24,17 @@ #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, @@ -121,12 +126,8 @@ static inline int TEMP_FROM_REG(s8 val) 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; @@ -152,10 +153,12 @@ struct lm78_data { 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); @@ -171,13 +174,13 @@ static struct i2c_driver lm78_driver = { .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, }; @@ -203,8 +206,8 @@ static ssize_t show_in_max(struct device *dev, char *buf, int nr) 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); @@ -217,8 +220,8 @@ static ssize_t set_in_min(struct device *dev, const char *buf, 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); @@ -284,8 +287,8 @@ static ssize_t show_temp_over(struct device *dev, struct device_attribute *attr, 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); @@ -303,8 +306,8 @@ static ssize_t show_temp_hyst(struct device *dev, struct device_attribute *attr, 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); @@ -338,8 +341,8 @@ static ssize_t show_fan_min(struct device *dev, char *buf, int nr) 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); @@ -362,8 +365,8 @@ static ssize_t show_fan_div(struct device *dev, char *buf, int nr) 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; @@ -378,7 +381,7 @@ static ssize_t set_fan_div(struct device *dev, const char *buf, 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; @@ -475,11 +478,6 @@ static int lm78_attach_adapter(struct i2c_adapter *adapter) 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, @@ -524,6 +522,17 @@ static const struct attribute_group lm78_group = { .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) { @@ -531,54 +540,10 @@ 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 @@ -591,13 +556,10 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) } 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) { @@ -605,8 +567,8 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) 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; } @@ -641,9 +603,6 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) 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; @@ -651,12 +610,6 @@ static int lm78_detect(struct i2c_adapter *adapter, int address, int kind) /* 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; @@ -676,9 +629,6 @@ ERROR3: ERROR2: kfree(data); ERROR1: - if (is_isa) - release_region(address, LM78_EXTENT); -ERROR0: return err; } @@ -693,9 +643,77 @@ static int lm78_detach_client(struct i2c_client *client) 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; @@ -709,7 +727,7 @@ static int lm78_detach_client(struct i2c_client *client) 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); @@ -729,7 +747,7 @@ static int lm78_read_value(struct i2c_client *client, u8 reg) 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); @@ -742,18 +760,29 @@ static int lm78_write_value(struct i2c_client *client, u8 reg, u8 value) 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); @@ -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; + + 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); } |
