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authorIke Panhc <ike.pan@canonical.com>2010-10-01 11:38:46 +0400
committerMatthew Garrett <mjg@redhat.com>2010-10-21 17:36:49 +0400
commit6a09f21dd1e205a68c8f8c4f39e4cff8f63801b6 (patch)
tree547bc3b0d628dcc4a185b552a26fcb16aec6170e /drivers/platform
parent037accfa14b28ecf49d9060063929c4b4cde373f (diff)
downloadlinux-6a09f21dd1e205a68c8f8c4f39e4cff8f63801b6.tar.xz
ideapad: add ACPI helpers
There are two methods under VPC2004 which is used to access VDAT/VCMD of EC register. Add helpers for read and write these two registers. And add read_method_int for reading the return value from ACPI methods which requires no parameter. Signed-off-by: Ike Panhc <ike.pan@canonical.com> Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/ideapad_acpi.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/platform/x86/ideapad_acpi.c b/drivers/platform/x86/ideapad_acpi.c
index 798496353e8c..c87693c7dde0 100644
--- a/drivers/platform/x86/ideapad_acpi.c
+++ b/drivers/platform/x86/ideapad_acpi.c
@@ -49,6 +49,115 @@ static struct {
{ "ideapad_killsw", RFKILL_TYPE_WLAN }
};
+/*
+ * ACPI Helpers
+ */
+#define IDEAPAD_EC_TIMEOUT (100) /* in ms */
+
+static int read_method_int(acpi_handle handle, const char *method, int *val)
+{
+ acpi_status status;
+ unsigned long long result;
+
+ status = acpi_evaluate_integer(handle, (char *)method, NULL, &result);
+ if (ACPI_FAILURE(status)) {
+ *val = -1;
+ return -1;
+ } else {
+ *val = result;
+ return 0;
+ }
+}
+
+static int method_vpcr(acpi_handle handle, int cmd, int *ret)
+{
+ acpi_status status;
+ unsigned long long result;
+ struct acpi_object_list params;
+ union acpi_object in_obj;
+
+ params.count = 1;
+ params.pointer = &in_obj;
+ in_obj.type = ACPI_TYPE_INTEGER;
+ in_obj.integer.value = cmd;
+
+ status = acpi_evaluate_integer(handle, "VPCR", &params, &result);
+
+ if (ACPI_FAILURE(status)) {
+ *ret = -1;
+ return -1;
+ } else {
+ *ret = result;
+ return 0;
+ }
+}
+
+static int method_vpcw(acpi_handle handle, int cmd, int data)
+{
+ struct acpi_object_list params;
+ union acpi_object in_obj[2];
+ acpi_status status;
+
+ params.count = 2;
+ params.pointer = in_obj;
+ in_obj[0].type = ACPI_TYPE_INTEGER;
+ in_obj[0].integer.value = cmd;
+ in_obj[1].type = ACPI_TYPE_INTEGER;
+ in_obj[1].integer.value = data;
+
+ status = acpi_evaluate_object(handle, "VPCW", &params, NULL);
+ if (status != AE_OK)
+ return -1;
+ return 0;
+}
+
+static int read_ec_data(acpi_handle handle, int cmd, unsigned long *data)
+{
+ int val;
+ unsigned long int end_jiffies;
+
+ if (method_vpcw(handle, 1, cmd))
+ return -1;
+
+ for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
+ time_before(jiffies, end_jiffies);) {
+ schedule();
+ if (method_vpcr(handle, 1, &val))
+ return -1;
+ if (val == 0) {
+ if (method_vpcr(handle, 0, &val))
+ return -1;
+ *data = val;
+ return 0;
+ }
+ }
+ pr_err("timeout in read_ec_cmd\n");
+ return -1;
+}
+
+static int write_ec_cmd(acpi_handle handle, int cmd, unsigned long data)
+{
+ int val;
+ unsigned long int end_jiffies;
+
+ if (method_vpcw(handle, 0, data))
+ return -1;
+ if (method_vpcw(handle, 1, cmd))
+ return -1;
+
+ for (end_jiffies = jiffies+(HZ)*IDEAPAD_EC_TIMEOUT/1000+1;
+ time_before(jiffies, end_jiffies);) {
+ schedule();
+ if (method_vpcr(handle, 1, &val))
+ return -1;
+ if (val == 0)
+ return 0;
+ }
+ pr_err("timeout in write_ec_cmd\n");
+ return -1;
+}
+/* the above is ACPI helpers */
+
static int ideapad_dev_exists(int device)
{
acpi_status status;