Commit 91749996 authored by Jean Delvare's avatar Jean Delvare Committed by Greg Kroah-Hartman
Browse files

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



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: default avatarJean Delvare <khali@linux-fr.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 80ce3b7d

Documentation/hwmon/it87

+4 −4
Original line number Diff line number Diff line
@@ -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>

drivers/hwmon/it87.c

+11 −40
Original line number Diff line number Diff line
@@ -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. */
@@ -1182,21 +1155,19 @@ 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;



	if (!it87_find(&isa_address)) {

		res = i2c_isa_add_driver(&it87_isa_driver);

		if (res) {

			i2c_del_driver(&it87_driver);

			return res;

		}

	}



	return 0;

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE