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path: root/drivers/leds/dell-led.c
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Diffstat (limited to 'drivers/leds/dell-led.c')
-rw-r--r--drivers/leds/dell-led.c171
1 files changed, 164 insertions, 7 deletions
diff --git a/drivers/leds/dell-led.c b/drivers/leds/dell-led.c
index e5c57389efd6..c36acaf566a6 100644
--- a/drivers/leds/dell-led.c
+++ b/drivers/leds/dell-led.c
@@ -15,12 +15,15 @@
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/dell-led.h>
MODULE_AUTHOR("Louis Davis/Jim Dailey");
MODULE_DESCRIPTION("Dell LED Control Driver");
MODULE_LICENSE("GPL");
#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
+#define DELL_APP_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
/* Error Result Codes: */
@@ -39,6 +42,149 @@ MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
#define CMD_LED_OFF 17
#define CMD_LED_BLINK 18
+struct app_wmi_args {
+ u16 class;
+ u16 selector;
+ u32 arg1;
+ u32 arg2;
+ u32 arg3;
+ u32 arg4;
+ u32 res1;
+ u32 res2;
+ u32 res3;
+ u32 res4;
+ char dummy[92];
+};
+
+#define GLOBAL_MIC_MUTE_ENABLE 0x364
+#define GLOBAL_MIC_MUTE_DISABLE 0x365
+
+struct dell_bios_data_token {
+ u16 tokenid;
+ u16 location;
+ u16 value;
+};
+
+struct __attribute__ ((__packed__)) dell_bios_calling_interface {
+ struct dmi_header header;
+ u16 cmd_io_addr;
+ u8 cmd_io_code;
+ u32 supported_cmds;
+ struct dell_bios_data_token damap[];
+};
+
+static struct dell_bios_data_token dell_mic_tokens[2];
+
+static int dell_wmi_perform_query(struct app_wmi_args *args)
+{
+ struct app_wmi_args *bios_return;
+ union acpi_object *obj;
+ struct acpi_buffer input;
+ struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+ acpi_status status;
+ u32 rc = -EINVAL;
+
+ input.length = 128;
+ input.pointer = args;
+
+ status = wmi_evaluate_method(DELL_APP_GUID, 0, 1, &input, &output);
+ if (!ACPI_SUCCESS(status))
+ goto err_out0;
+
+ obj = output.pointer;
+ if (!obj)
+ goto err_out0;
+
+ if (obj->type != ACPI_TYPE_BUFFER)
+ goto err_out1;
+
+ bios_return = (struct app_wmi_args *)obj->buffer.pointer;
+ rc = bios_return->res1;
+ if (rc)
+ goto err_out1;
+
+ memcpy(args, bios_return, sizeof(struct app_wmi_args));
+ rc = 0;
+
+ err_out1:
+ kfree(obj);
+ err_out0:
+ return rc;
+}
+
+static void __init find_micmute_tokens(const struct dmi_header *dm, void *dummy)
+{
+ struct dell_bios_calling_interface *calling_interface;
+ struct dell_bios_data_token *token;
+ int token_size = sizeof(struct dell_bios_data_token);
+ int i = 0;
+
+ if (dm->type == 0xda && dm->length > 17) {
+ calling_interface = container_of(dm,
+ struct dell_bios_calling_interface, header);
+
+ token = &calling_interface->damap[i];
+ while (token->tokenid != 0xffff) {
+ if (token->tokenid == GLOBAL_MIC_MUTE_DISABLE)
+ memcpy(&dell_mic_tokens[0], token, token_size);
+ else if (token->tokenid == GLOBAL_MIC_MUTE_ENABLE)
+ memcpy(&dell_mic_tokens[1], token, token_size);
+
+ i++;
+ token = &calling_interface->damap[i];
+ }
+ }
+}
+
+static int dell_micmute_led_set(int state)
+{
+ struct app_wmi_args args;
+ struct dell_bios_data_token *token;
+
+ if (!wmi_has_guid(DELL_APP_GUID))
+ return -ENODEV;
+
+ if (state == 0 || state == 1)
+ token = &dell_mic_tokens[state];
+ else
+ return -EINVAL;
+
+ memset(&args, 0, sizeof(struct app_wmi_args));
+
+ args.class = 1;
+ args.arg1 = token->location;
+ args.arg2 = token->value;
+
+ dell_wmi_perform_query(&args);
+
+ return state;
+}
+
+int dell_app_wmi_led_set(int whichled, int on)
+{
+ int state = 0;
+
+ switch (whichled) {
+ case DELL_LED_MICMUTE:
+ state = dell_micmute_led_set(on);
+ break;
+ default:
+ pr_warn("led type %x is not supported\n", whichled);
+ break;
+ }
+
+ return state;
+}
+EXPORT_SYMBOL_GPL(dell_app_wmi_led_set);
+
+static int __init dell_micmute_led_init(void)
+{
+ memset(dell_mic_tokens, 0, sizeof(struct dell_bios_data_token) * 2);
+ dmi_walk(find_micmute_tokens, NULL);
+
+ return 0;
+}
+
struct bios_args {
unsigned char length;
unsigned char result_code;
@@ -181,21 +327,32 @@ static int __init dell_led_init(void)
{
int error = 0;
- if (!wmi_has_guid(DELL_LED_BIOS_GUID))
+ if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID))
return -ENODEV;
- error = led_off();
- if (error != 0)
- return -ENODEV;
+ if (wmi_has_guid(DELL_APP_GUID))
+ error = dell_micmute_led_init();
- return led_classdev_register(NULL, &dell_led);
+ if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
+ error = led_off();
+ if (error != 0)
+ return -ENODEV;
+
+ error = led_classdev_register(NULL, &dell_led);
+ }
+
+ return error;
}
static void __exit dell_led_exit(void)
{
- led_classdev_unregister(&dell_led);
+ int error = 0;
- led_off();
+ if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
+ error = led_off();
+ if (error == 0)
+ led_classdev_unregister(&dell_led);
+ }
}
module_init(dell_led_init);

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