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[PATCH] hwmon: Drop legacy ISA address support from it87

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Drop legacy ISA address support from the it87 driver. All supported
chips are Super-I/O chips, so the device ISA address can be safely read
from Super-I/O space rather than blindly assumed.

Two nearby inaccurate documentation statements have been fixed as well:
* The IT8705F doesn't have an SMBus interface.
* The SiS950 doesn't have a distinct prefix.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jean Delvare 2005-10-08 00:10:00 +02:00 committed by Greg Kroah-Hartman
parent 80ce3b7d0f
commit 9174999628
2 changed files with 15 additions and 44 deletions
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8
Documentation/hwmon/it87
View file

@ -4,18 +4,18 @@ Kernel driver it87
Supported chips:
* IT8705F
Prefix: 'it87'
Addresses scanned: from Super I/O config space, or default ISA 0x290 (8 I/O ports)
Addresses scanned: from Super I/O config space (8 I/O ports)
Datasheet: Publicly available at the ITE website
http://www.ite.com.tw/
* IT8712F
Prefix: 'it8712'
Addresses scanned: I2C 0x28 - 0x2f
from Super I/O config space, or default ISA 0x290 (8 I/O ports)
from Super I/O config space (8 I/O ports)
Datasheet: Publicly available at the ITE website
http://www.ite.com.tw/
* SiS950 [clone of IT8705F]
Prefix: 'sis950'
Addresses scanned: from Super I/O config space, or default ISA 0x290 (8 I/O ports)
Prefix: 'it87'
Addresses scanned: from Super I/O config space (8 I/O ports)
Datasheet: No longer be available
Author: Christophe Gauthron <chrisg@0-in.com>

51
drivers/hwmon/it87.c
View file

@ -2,7 +2,7 @@
it87.c - Part of lm_sensors, Linux kernel modules for hardware
monitoring.
Supports: IT8705F Super I/O chip w/LPC interface & SMBus
Supports: IT8705F Super I/O chip w/LPC interface
IT8712F Super I/O chip w/LPC interface & SMBus
Sis950 A clone of the IT8705F
@ -47,7 +47,7 @@
/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
0x2e, 0x2f, I2C_CLIENT_END };
static unsigned short isa_address = 0x290;
static unsigned short isa_address;
/* Insmod parameters */
I2C_CLIENT_INSMOD_2(it87, it8712);
@ -706,7 +706,7 @@ static int it87_isa_attach_adapter(struct i2c_adapter *adapter)
}
/* SuperIO detection - will change isa_address if a chip is found */
static int __init it87_find(int *address)
static int __init it87_find(unsigned short *address)
{
int err = -ENODEV;
@ -757,34 +757,7 @@ int it87_detect(struct i2c_adapter *adapter, int address, int kind)
if (!request_region(address, IT87_EXTENT, it87_isa_driver.name))
goto ERROR0;
/* Probe whether there is anything available on this address. Already
done for SMBus and Super-I/O clients */
if (kind < 0) {
if (is_isa && !chip_type) {
#define REALLY_SLOW_IO
/* We need the timeouts for at least some IT87-like chips. But only
if we read 'undefined' registers. */
i = inb_p(address + 1);
if (inb_p(address + 2) != i
|| inb_p(address + 3) != i
|| 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;
}
}
}
/* OK. For now, we presume we have a valid client. We now create the
/* For now, we presume we have a valid client. We create the
client structure, even though we cannot fill it completely yet.
But it allows us to access it87_{read,write}_value. */
@ -1182,20 +1155,18 @@ static struct it87_data *it87_update_device(struct device *dev)
static int __init sm_it87_init(void)
{
int addr, res;
if (!it87_find(&addr)) {
isa_address = addr;
}
int res;
res = i2c_add_driver(&it87_driver);
if (res)
return res;
res = i2c_isa_add_driver(&it87_isa_driver);
if (res) {
i2c_del_driver(&it87_driver);
return res;
if (!it87_find(&isa_address)) {
res = i2c_isa_add_driver(&it87_isa_driver);
if (res) {
i2c_del_driver(&it87_driver);
return res;
}
}
return 0;