diff options
| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | 2010-05-16 19:45:43 -0300 |
|---|---|---|
| committer | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | 2010-05-16 19:45:43 -0300 |
| commit | 437e470c4ca818c97426afa3a67fbd7e34cffe00 (patch) | |
| tree | 771a16de2854ae31f6fe5ae544f32f7106367480 /drivers/platform/x86/thinkpad_acpi.c | |
| parent | 38e11cdec90f1dd7355db4aed8a1857258e99485 (diff) | |
thinkpad-acpi: detect EC node using its HID (v2)
Use the EC HID (PNP0C09) to locate its main node, instead of a static
list.
Suggested-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/platform/x86/thinkpad_acpi.c')
| -rw-r--r-- | drivers/platform/x86/thinkpad_acpi.c | 53 |
1 files changed, 41 insertions, 12 deletions
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index b03cb3e0458..877a7802e83 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -129,6 +129,7 @@ enum { /* ACPI HIDs */ #define TPACPI_ACPI_HKEY_HID "IBM0068" +#define TPACPI_ACPI_EC_HID "PNP0C09" /* Input IDs */ #define TPACPI_HKEY_INPUT_PRODUCT 0x5054 /* "TP" */ @@ -511,6 +512,7 @@ static inline bool __pure __init tpacpi_is_ibm(void) */ static acpi_handle root_handle; +static acpi_handle ec_handle; #define TPACPI_HANDLE(object, parent, paths...) \ static acpi_handle object##_handle; \ @@ -518,16 +520,6 @@ static acpi_handle root_handle; static char *object##_path; \ static char *object##_paths[] = { paths } -TPACPI_HANDLE(ec, root, "\\_SB.PCI0.ISA.EC0", /* 240, 240x */ - "\\_SB.PCI.ISA.EC", /* 570 */ - "\\_SB.PCI0.ISA0.EC0", /* 600e/x, 770e, 770x */ - "\\_SB.PCI0.ISA.EC", /* A21e, A2xm/p, T20-22, X20-21 */ - "\\_SB.PCI0.AD4S.EC0", /* i1400, R30 */ - "\\_SB.PCI0.ICH3.EC0", /* R31 */ - "\\_SB.PCI0.LPC0.EC", /* X100e and a few others */ - "\\_SB.PCI0.LPC.EC", /* all others */ - ); - TPACPI_HANDLE(ecrd, ec, "ECRD"); /* 570 */ TPACPI_HANDLE(ecwr, ec, "ECWR"); /* 570 */ @@ -708,6 +700,43 @@ static void drv_acpi_handle_init(char *name, *handle = NULL; } +static acpi_status __init tpacpi_acpi_handle_locate_callback(acpi_handle handle, + u32 level, void *context, void **return_value) +{ + *(acpi_handle *)return_value = handle; + + return AE_CTRL_TERMINATE; +} + +static void __init tpacpi_acpi_handle_locate(const char *name, + const char *hid, + acpi_handle *handle) +{ + acpi_status status; + acpi_handle device_found; + + BUG_ON(!name || !hid || !handle); + vdbg_printk(TPACPI_DBG_INIT, + "trying to locate ACPI handle for %s, using HID %s\n", + name, hid); + + memset(&device_found, 0, sizeof(device_found)); + status = acpi_get_devices(hid, tpacpi_acpi_handle_locate_callback, + (void *)name, &device_found); + + *handle = NULL; + + if (ACPI_SUCCESS(status)) { + *handle = device_found; + dbg_printk(TPACPI_DBG_INIT, + "Found ACPI handle for %s\n", name); + } else { + vdbg_printk(TPACPI_DBG_INIT, + "Could not locate an ACPI handle for %s: %s\n", + name, acpi_format_exception(status)); + } +} + static void dispatch_acpi_notify(acpi_handle handle, u32 event, void *data) { struct ibm_struct *ibm = data; @@ -8752,8 +8781,8 @@ static int __init probe_for_thinkpad(void) (thinkpad_id.ec_model != 0) || tpacpi_is_fw_known(); - /* ec is required because many other handles are relative to it */ - TPACPI_ACPIHANDLE_INIT(ec); + /* The EC handler is required */ + tpacpi_acpi_handle_locate("ec", TPACPI_ACPI_EC_HID, &ec_handle); if (!ec_handle) { if (is_thinkpad) printk(TPACPI_ERR |