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hwmon: (nct6775) Support two SuperIO chips in the same system 

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2013-04-05 07:35:25 -07:00
parent f73cf632df
commit 698a7c24a5
1 changed files with 66 additions and 53 deletions
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119
drivers/hwmon/nct6775.c
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@ -3484,11 +3484,11 @@ static const char * const nct6775_sio_names[] __initconst = {
};
/* nct6775_find() looks for a '627 in the Super-I/O config space */
static int __init nct6775_find(int sioaddr, unsigned short *addr,
struct nct6775_sio_data *sio_data)
static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
{
u16 val;
int err;
int addr;
err = superio_enter(sioaddr);
if (err)
@ -3520,8 +3520,8 @@ static int __init nct6775_find(int sioaddr, unsigned short *addr,
superio_select(sioaddr, NCT6775_LD_HWM);
val = (superio_inb(sioaddr, SIO_REG_ADDR) << 8)
| superio_inb(sioaddr, SIO_REG_ADDR + 1);
*addr = val & IOREGION_ALIGNMENT;
if (*addr == 0) {
addr = val & IOREGION_ALIGNMENT;
if (addr == 0) {
pr_err("Refusing to enable a Super-I/O device with a base I/O port 0\n");
superio_exit(sioaddr);
return -ENODEV;
@ -3535,11 +3535,11 @@ static int __init nct6775_find(int sioaddr, unsigned short *addr,
}
superio_exit(sioaddr);
pr_info("Found %s or compatible chip at %#x\n",
nct6775_sio_names[sio_data->kind], *addr);
pr_info("Found %s or compatible chip at %#x:%#x\n",
nct6775_sio_names[sio_data->kind], sioaddr, addr);
sio_data->sioreg = sioaddr;
return 0;
return addr;
}
/*
@ -3548,14 +3548,20 @@ static int __init nct6775_find(int sioaddr, unsigned short *addr,
* track of the nct6775 driver. But since we platform_device_alloc(), we
* must keep track of the device
*/
static struct platform_device *pdev;
static struct platform_device *pdev[2];
static int __init sensors_nct6775_init(void)
{
int err;
unsigned short address;
int i, err;
bool found = false;
int address;
struct resource res;
struct nct6775_sio_data sio_data;
int sioaddr[2] = { 0x2e, 0x4e };
err = platform_driver_register(&nct6775_driver);
if (err)
return err;
/*
* initialize sio_data->kind and sio_data->sioreg.
@ -3564,64 +3570,71 @@ static int __init sensors_nct6775_init(void)
* driver will probe 0x2e and 0x4e and auto-detect the presence of a
* nct6775 hardware monitor, and call probe()
*/
if (nct6775_find(0x2e, &address, &sio_data) &&
nct6775_find(0x4e, &address, &sio_data))
return -ENODEV;
for (i = 0; i < ARRAY_SIZE(pdev); i++) {
address = nct6775_find(sioaddr[i], &sio_data);
if (address <= 0)
continue;
err = platform_driver_register(&nct6775_driver);
if (err)
goto exit;
found = true;
pdev = platform_device_alloc(DRVNAME, address);
if (!pdev) {
err = -ENOMEM;
pr_err("Device allocation failed\n");
pdev[i] = platform_device_alloc(DRVNAME, address);
if (!pdev[i]) {
err = -ENOMEM;
goto exit_device_put;
}
err = platform_device_add_data(pdev[i], &sio_data,
sizeof(struct nct6775_sio_data));
if (err)
goto exit_device_put;
memset(&res, 0, sizeof(res));
res.name = DRVNAME;
res.start = address + IOREGION_OFFSET;
res.end = address + IOREGION_OFFSET + IOREGION_LENGTH - 1;
res.flags = IORESOURCE_IO;
err = acpi_check_resource_conflict(&res);
if (err) {
platform_device_put(pdev[i]);
pdev[i] = NULL;
continue;
}
err = platform_device_add_resources(pdev[i], &res, 1);
if (err)
goto exit_device_put;
/* platform_device_add calls probe() */
err = platform_device_add(pdev[i]);
if (err)
goto exit_device_put;
}
if (!found) {
err = -ENODEV;
goto exit_unregister;
}
err = platform_device_add_data(pdev, &sio_data,
sizeof(struct nct6775_sio_data));
if (err) {
pr_err("Platform data allocation failed\n");
goto exit_device_put;
}
memset(&res, 0, sizeof(res));
res.name = DRVNAME;
res.start = address + IOREGION_OFFSET;
res.end = address + IOREGION_OFFSET + IOREGION_LENGTH - 1;
res.flags = IORESOURCE_IO;
err = acpi_check_resource_conflict(&res);
if (err)
goto exit_device_put;
err = platform_device_add_resources(pdev, &res, 1);
if (err) {
pr_err("Device resource addition failed (%d)\n", err);
goto exit_device_put;
}
/* platform_device_add calls probe() */
err = platform_device_add(pdev);
if (err) {
pr_err("Device addition failed (%d)\n", err);
goto exit_device_put;
}
return 0;
exit_device_put:
platform_device_put(pdev);
for (i = 0; i < ARRAY_SIZE(pdev); i++) {
if (pdev[i])
platform_device_put(pdev[i]);
}
exit_unregister:
platform_driver_unregister(&nct6775_driver);
exit:
return err;
}
static void __exit sensors_nct6775_exit(void)
{
platform_device_unregister(pdev);
int i;
for (i = 0; i < ARRAY_SIZE(pdev); i++) {
if (pdev[i])
platform_device_unregister(pdev[i]);
}
platform_driver_unregister(&nct6775_driver);
}