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hwmon: (it87) Add support for second Super-IO chip

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The Super-IO chip can also reside at SIO address 0x4e, and there can be
two Super-IO chips in the system. Add support for it.

Tested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2015-03-28 08:24:29 -07:00
parent 3c2e35126f
commit e84bd9535e
1 changed files with 34 additions and 15 deletions
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49
drivers/hwmon/it87.c
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@ -78,9 +78,10 @@ static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");
static struct platform_device *it87_pdev;
static struct platform_device *it87_pdev[2];
#define REG_2E 0x2e /* The register to read/write */
#define REG_4E 0x4e /* Secondary register to read/write */
#define DEV 0x07 /* Register: Logical device select */
#define PME 0x04 /* The device with the fan registers in it */
@ -130,7 +131,7 @@ static inline int superio_enter(int ioreg)
outb(0x87, ioreg);
outb(0x01, ioreg);
outb(0x55, ioreg);
outb(0x55, ioreg);
outb(ioreg == REG_4E ? 0xaa : 0x55, ioreg);
return 0;
}
@ -2892,7 +2893,7 @@ static struct it87_data *it87_update_device(struct device *dev)
return data;
}
static int __init it87_device_add(unsigned short address,
static int __init it87_device_add(int index, unsigned short address,
const struct it87_sio_data *sio_data)
{
struct platform_device *pdev;
@ -2931,7 +2932,7 @@ static int __init it87_device_add(unsigned short address,
goto exit_device_put;
}
it87_pdev = pdev;
it87_pdev[index] = pdev;
return 0;
exit_device_put:
@ -2941,30 +2942,48 @@ exit_device_put:
static int __init sm_it87_init(void)
{
int err;
unsigned short isa_address = 0;
int sioaddr[2] = { REG_2E, REG_4E };
struct it87_sio_data sio_data;
unsigned short isa_address;
bool found = false;
int i, err;
memset(&sio_data, 0, sizeof(struct it87_sio_data));
err = it87_find(REG_2E, &isa_address, &sio_data);
if (err)
return err;
err = platform_driver_register(&it87_driver);
if (err)
return err;
err = it87_device_add(isa_address, &sio_data);
if (err) {
platform_driver_unregister(&it87_driver);
return err;
for (i = 0; i < ARRAY_SIZE(sioaddr); i++) {
memset(&sio_data, 0, sizeof(struct it87_sio_data));
isa_address = 0;
err = it87_find(sioaddr[i], &isa_address, &sio_data);
if (err || isa_address == 0)
continue;
err = it87_device_add(i, isa_address, &sio_data);
if (err)
goto exit_dev_unregister;
found = true;
}
if (!found) {
err = -ENODEV;
goto exit_unregister;
}
return 0;
exit_dev_unregister:
/* NULL check handled by platform_device_unregister */
platform_device_unregister(it87_pdev[0]);
exit_unregister:
platform_driver_unregister(&it87_driver);
return err;
}
static void __exit sm_it87_exit(void)
{
platform_device_unregister(it87_pdev);
/* NULL check handled by platform_device_unregister */
platform_device_unregister(it87_pdev[1]);
platform_device_unregister(it87_pdev[0]);
platform_driver_unregister(&it87_driver);
}