diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-10-20 00:10:27 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-10-20 00:10:27 -0300 |
commit | d0b2f91bede3bd5e3d24dd6803e56eee959c1797 (patch) | |
tree | 7fee4ab0509879c373c4f2cbd5b8a5be5b4041ee /drivers/acpi/button.c | |
parent | e914f8eb445e8f74b00303c19c2ffceaedd16a05 (diff) |
Linux-libre 4.8.2-gnupck-4.8.2-gnu
Diffstat (limited to 'drivers/acpi/button.c')
-rw-r--r-- | drivers/acpi/button.c | 153 |
1 files changed, 111 insertions, 42 deletions
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c index 5c3b0918d..31abb0bdd 100644 --- a/drivers/acpi/button.c +++ b/drivers/acpi/button.c @@ -53,6 +53,10 @@ #define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch" #define ACPI_BUTTON_TYPE_LID 0x05 +#define ACPI_BUTTON_LID_INIT_IGNORE 0x00 +#define ACPI_BUTTON_LID_INIT_OPEN 0x01 +#define ACPI_BUTTON_LID_INIT_METHOD 0x02 + #define _COMPONENT ACPI_BUTTON_COMPONENT ACPI_MODULE_NAME("button"); @@ -105,6 +109,7 @@ struct acpi_button { static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier); static struct acpi_device *lid_device; +static u8 lid_init_state = ACPI_BUTTON_LID_INIT_METHOD; /* -------------------------------------------------------------------------- FS Interface (/proc) @@ -113,16 +118,52 @@ static struct acpi_device *lid_device; static struct proc_dir_entry *acpi_button_dir; static struct proc_dir_entry *acpi_lid_dir; +static int acpi_lid_evaluate_state(struct acpi_device *device) +{ + unsigned long long lid_state; + acpi_status status; + + status = acpi_evaluate_integer(device->handle, "_LID", NULL, &lid_state); + if (ACPI_FAILURE(status)) + return -ENODEV; + + return lid_state ? 1 : 0; +} + +static int acpi_lid_notify_state(struct acpi_device *device, int state) +{ + struct acpi_button *button = acpi_driver_data(device); + int ret; + + /* input layer checks if event is redundant */ + input_report_switch(button->input, SW_LID, !state); + input_sync(button->input); + + if (state) + pm_wakeup_event(&device->dev, 0); + + ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device); + if (ret == NOTIFY_DONE) + ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, + device); + if (ret == NOTIFY_DONE || ret == NOTIFY_OK) { + /* + * It is also regarded as success if the notifier_chain + * returns NOTIFY_OK or NOTIFY_DONE. + */ + ret = 0; + } + return ret; +} + static int acpi_button_state_seq_show(struct seq_file *seq, void *offset) { struct acpi_device *device = seq->private; - acpi_status status; - unsigned long long state; + int state; - status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); + state = acpi_lid_evaluate_state(device); seq_printf(seq, "state: %s\n", - ACPI_FAILURE(status) ? "unsupported" : - (state ? "open" : "closed")); + state < 0 ? "unsupported" : (state ? "open" : "closed")); return 0; } @@ -191,8 +232,10 @@ remove_dev_dir: acpi_device_dir(device) = NULL; remove_lid_dir: remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); + acpi_lid_dir = NULL; remove_button_dir: remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); + acpi_button_dir = NULL; goto done; } @@ -209,7 +252,9 @@ static int acpi_button_remove_fs(struct acpi_device *device) acpi_lid_dir); acpi_device_dir(device) = NULL; remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir); + acpi_lid_dir = NULL; remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir); + acpi_button_dir = NULL; return 0; } @@ -231,51 +276,37 @@ EXPORT_SYMBOL(acpi_lid_notifier_unregister); int acpi_lid_open(void) { - acpi_status status; - unsigned long long state; - if (!lid_device) return -ENODEV; - status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL, - &state); - if (ACPI_FAILURE(status)) - return -ENODEV; - - return !!state; + return acpi_lid_evaluate_state(lid_device); } EXPORT_SYMBOL(acpi_lid_open); -static int acpi_lid_send_state(struct acpi_device *device) +static int acpi_lid_update_state(struct acpi_device *device) { - struct acpi_button *button = acpi_driver_data(device); - unsigned long long state; - acpi_status status; - int ret; - - status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state); - if (ACPI_FAILURE(status)) - return -ENODEV; + int state; - /* input layer checks if event is redundant */ - input_report_switch(button->input, SW_LID, !state); - input_sync(button->input); + state = acpi_lid_evaluate_state(device); + if (state < 0) + return state; - if (state) - pm_wakeup_event(&device->dev, 0); + return acpi_lid_notify_state(device, state); +} - ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device); - if (ret == NOTIFY_DONE) - ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, - device); - if (ret == NOTIFY_DONE || ret == NOTIFY_OK) { - /* - * It is also regarded as success if the notifier_chain - * returns NOTIFY_OK or NOTIFY_DONE. - */ - ret = 0; +static void acpi_lid_initialize_state(struct acpi_device *device) +{ + switch (lid_init_state) { + case ACPI_BUTTON_LID_INIT_OPEN: + (void)acpi_lid_notify_state(device, 1); + break; + case ACPI_BUTTON_LID_INIT_METHOD: + (void)acpi_lid_update_state(device); + break; + case ACPI_BUTTON_LID_INIT_IGNORE: + default: + break; } - return ret; } static void acpi_button_notify(struct acpi_device *device, u32 event) @@ -290,7 +321,7 @@ static void acpi_button_notify(struct acpi_device *device, u32 event) case ACPI_BUTTON_NOTIFY_STATUS: input = button->input; if (button->type == ACPI_BUTTON_TYPE_LID) { - acpi_lid_send_state(device); + acpi_lid_update_state(device); } else { int keycode; @@ -335,7 +366,7 @@ static int acpi_button_resume(struct device *dev) button->suspended = false; if (button->type == ACPI_BUTTON_TYPE_LID) - return acpi_lid_send_state(device); + acpi_lid_initialize_state(device); return 0; } #endif @@ -416,7 +447,7 @@ static int acpi_button_add(struct acpi_device *device) if (error) goto err_remove_fs; if (button->type == ACPI_BUTTON_TYPE_LID) { - acpi_lid_send_state(device); + acpi_lid_initialize_state(device); /* * This assumes there's only one lid device, or if there are * more we only care about the last one... @@ -446,4 +477,42 @@ static int acpi_button_remove(struct acpi_device *device) return 0; } +static int param_set_lid_init_state(const char *val, struct kernel_param *kp) +{ + int result = 0; + + if (!strncmp(val, "open", sizeof("open") - 1)) { + lid_init_state = ACPI_BUTTON_LID_INIT_OPEN; + pr_info("Notify initial lid state as open\n"); + } else if (!strncmp(val, "method", sizeof("method") - 1)) { + lid_init_state = ACPI_BUTTON_LID_INIT_METHOD; + pr_info("Notify initial lid state with _LID return value\n"); + } else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) { + lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE; + pr_info("Do not notify initial lid state\n"); + } else + result = -EINVAL; + return result; +} + +static int param_get_lid_init_state(char *buffer, struct kernel_param *kp) +{ + switch (lid_init_state) { + case ACPI_BUTTON_LID_INIT_OPEN: + return sprintf(buffer, "open"); + case ACPI_BUTTON_LID_INIT_METHOD: + return sprintf(buffer, "method"); + case ACPI_BUTTON_LID_INIT_IGNORE: + return sprintf(buffer, "ignore"); + default: + return sprintf(buffer, "invalid"); + } + return 0; +} + +module_param_call(lid_init_state, + param_set_lid_init_state, param_get_lid_init_state, + NULL, 0644); +MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state"); + module_acpi_driver(acpi_button_driver); |