diff options
Diffstat (limited to 'include/linux/hid.h')
| -rw-r--r-- | include/linux/hid.h | 104 |
1 files changed, 99 insertions, 5 deletions
diff --git a/include/linux/hid.h b/include/linux/hid.h index c4bea0eda85b..ac2584fe65c5 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -419,6 +419,7 @@ struct hid_control_fifo { #define HID_CLAIMED_HIDRAW 4 #define HID_STAT_ADDED 1 +#define HID_STAT_PARSED 2 #define HID_CTRL_RUNNING 1 #define HID_OUT_RUNNING 2 @@ -435,6 +436,7 @@ struct hid_input { }; struct hid_driver; +struct hid_ll_driver; struct hid_device { /* device report descriptor */ __u8 *rdesc; @@ -452,6 +454,7 @@ struct hid_device { /* device report descriptor */ struct device dev; /* device */ struct hid_driver *driver; + struct hid_ll_driver *ll_driver; unsigned int status; /* see STAT flags above */ unsigned claimed; /* Claimed by hidinput, hiddev? */ @@ -471,11 +474,6 @@ struct hid_device { /* device report descriptor */ __s32 delayed_value; /* For A4 Tech mice hwheel quirk */ - /* device-specific function pointers */ - int (*hidinput_input_event) (struct input_dev *, unsigned int, unsigned int, int); - int (*hid_open) (struct hid_device *); - void (*hid_close) (struct hid_device *); - /* hiddev event handler */ void (*hiddev_hid_event) (struct hid_device *, struct hid_field *field, struct hid_usage *, __s32); @@ -561,9 +559,22 @@ struct hid_usage_id { * @raw_event: if report in report_table, this hook is called (NULL means nop) * @usage_table: on which events to call event (NULL means all) * @event: if usage in usage_table, this hook is called (NULL means nop) + * @report_fixup: called before report descriptor parsing (NULL means nop) + * @input_mapping: invoked on input registering before mapping an usage + * @input_mapped: invoked on input registering after mapping an usage * * raw_event and event should return 0 on no action performed, 1 when no * further processing should be done and negative on error + * + * input_mapping shall return a negative value to completely ignore this usage + * (e.g. doubled or invalid usage), zero to continue with parsing of this + * usage by generic code (no special handling needed) or positive to skip + * generic parsing (needed special handling which was done in the hook already) + * input_mapped shall return negative to inform the layer that this usage + * should not be considered for further processing or zero to notify that + * no processing was performed and should be done in a generic manner + * Both these functions may be NULL which means the same behavior as returning + * zero from them. */ struct hid_driver { char *name; @@ -578,10 +589,43 @@ struct hid_driver { const struct hid_usage_id *usage_table; int (*event)(struct hid_device *hdev, struct hid_field *field, struct hid_usage *usage, __s32 value); + + void (*report_fixup)(struct hid_device *hdev, __u8 *buf, + unsigned int size); + + int (*input_mapping)(struct hid_device *hdev, + struct hid_input *hidinput, struct hid_field *field, + struct hid_usage *usage, unsigned long **bit, int *max); + int (*input_mapped)(struct hid_device *hdev, + struct hid_input *hidinput, struct hid_field *field, + struct hid_usage *usage, unsigned long **bit, int *max); /* private: */ struct device_driver driver; }; +/** + * hid_ll_driver - low level driver callbacks + * @start: called on probe to start the device + * @stop: called on remove + * @open: called by input layer on open + * @close: called by input layer on close + * @hidinput_input_event: event input event (e.g. ff or leds) + * @parse: this method is called only once to parse the device data, + * shouldn't allocate anything to not leak memory + */ +struct hid_ll_driver { + int (*start)(struct hid_device *hdev); + void (*stop)(struct hid_device *hdev); + + int (*open)(struct hid_device *hdev); + void (*close)(struct hid_device *hdev); + + int (*hidinput_input_event) (struct input_dev *idev, unsigned int type, + unsigned int code, int value); + + int (*parse)(struct hid_device *hdev); +}; + /* Applications from HID Usage Tables 4/8/99 Version 1.1 */ /* We ignore a few input applications that are not widely used */ #define IS_INPUT_APPLICATION(a) (((a >= 0x00010000) && (a <= 0x00010008)) || (a == 0x00010080) || (a == 0x000c0001) || (a == 0x000d0002)) @@ -618,6 +662,56 @@ void hid_output_report(struct hid_report *report, __u8 *data); struct hid_device *hid_allocate_device(void); int hid_parse_report(struct hid_device *hid, __u8 *start, unsigned size); +/** + * hid_parse - parse HW reports + * + * @hdev: hid device + * + * Call this from probe after you set up the device (if needed). Your + * report_fixup will be called (if non-NULL) after reading raw report from + * device before passing it to hid layer for real parsing. + */ +static inline int __must_check hid_parse(struct hid_device *hdev) +{ + int ret; + + if (hdev->status & HID_STAT_PARSED) + return 0; + + ret = hdev->ll_driver->parse(hdev); + if (!ret) + hdev->status |= HID_STAT_PARSED; + + return ret; +} + +/** + * hid_hw_start - start underlaying HW + * + * @hdev: hid device + * + * Call this in probe function *after* hid_parse. This will setup HW buffers + * and start the device (if not deffered to device open). hid_hw_stop must be + * called if this was successfull. + */ +static inline int __must_check hid_hw_start(struct hid_device *hdev) +{ + return hdev->ll_driver->start(hdev); +} + +/** + * hid_hw_stop - stop underlaying HW + * + * @hdev: hid device + * + * This is usually called from remove function or from probe when something + * failed and hid_hw_start was called already. + */ +static inline void hid_hw_stop(struct hid_device *hdev) +{ + hdev->ll_driver->stop(hdev); +} + void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size, int interrupt); |