diff options
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/ideapad_acpi.c | 109 |
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", ¶ms, &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", ¶ms, 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; |