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ideapad: use return value of _CFG to tell if device exist or not 

There are several bits of the return value of _CFG shows if RF/Camera devices
exist or not.

Signed-off-by: Ike Panhc <ike.pan@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Ike Panhc 2010-10-01 15:39:29 +08:00 committed by Matthew Garrett
parent 6f8371c05e
commit dfa7f6fe0a
1 changed files with 10 additions and 34 deletions
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44
drivers/platform/x86/ideapad_acpi.c
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@ -40,13 +40,14 @@ struct ideapad_private {
static struct {
char *name;
int cfgbit;
int type;
} ideapad_rfk_data[] = {
/* camera has no rfkill */
{ "ideapad_wlan", RFKILL_TYPE_WLAN },
{ "ideapad_bluetooth", RFKILL_TYPE_BLUETOOTH },
{ "ideapad_3g", RFKILL_TYPE_WWAN },
{ "ideapad_killsw", RFKILL_TYPE_WLAN }
{ "ideapad_camera", 19, NUM_RFKILL_TYPES },
{ "ideapad_wlan", 18, RFKILL_TYPE_WLAN },
{ "ideapad_bluetooth", 16, RFKILL_TYPE_BLUETOOTH },
{ "ideapad_3g", 17, RFKILL_TYPE_WWAN },
{ "ideapad_killsw", 0, RFKILL_TYPE_WLAN }
};
/*
@ -158,32 +159,6 @@ static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
}
/* the above is ACPI helpers */
static int ideapad_dev_exists(int device)
{
acpi_status status;
union acpi_object in_param;
struct acpi_object_list input = { 1, &in_param };
struct acpi_buffer output;
union acpi_object out_obj;
output.length = sizeof(out_obj);
output.pointer = &out_obj;
in_param.type = ACPI_TYPE_INTEGER;
in_param.integer.value = device + 1;
status = acpi_evaluate_object(NULL, "\\_SB_.DECN", &input, &output);
if (ACPI_FAILURE(status)) {
printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method failed %d. Is this an IdeaPAD?\n", status);
return -ENODEV;
}
if (out_obj.type != ACPI_TYPE_INTEGER) {
printk(KERN_WARNING "IdeaPAD \\_SB_.DECN method returned unexpected type\n");
return -ENODEV;
}
return out_obj.integer.value;
}
static int ideapad_dev_get_state(int device)
{
acpi_status status;
@ -334,9 +309,10 @@ static int ideapad_acpi_add(struct acpi_device *adevice)
return -ENODEV;
for (i = IDEAPAD_DEV_CAMERA; i < IDEAPAD_DEV_KILLSW; i++) {
devs_present[i] = ideapad_dev_exists(i);
if (devs_present[i] < 0)
return devs_present[i];
if (test_bit(ideapad_rfk_data[i].cfgbit, (unsigned long *)&cfg))
devs_present[i] = 1;
else
devs_present[i] = 0;
}
/* The hardware switch is always present */