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HID: core: implement generic .request()
.request() can be emulated through .raw_request() we can implement this emulation in hid-core, and make .request not mandatory for transport layer drivers. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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@ -1248,6 +1248,11 @@ void hid_output_report(struct hid_report *report, __u8 *data)
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}
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EXPORT_SYMBOL_GPL(hid_output_report);
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static int hid_report_len(struct hid_report *report)
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{
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return ((report->size - 1) >> 3) + 1 + (report->id > 0) + 7;
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}
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/*
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* Allocator for buffer that is going to be passed to hid_output_report()
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*/
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@ -1258,7 +1263,7 @@ u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags)
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* of implement() working on 8 byte chunks
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*/
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int len = ((report->size - 1) >> 3) + 1 + (report->id > 0) + 7;
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int len = hid_report_len(report);
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return kmalloc(len, flags);
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}
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@ -1314,6 +1319,44 @@ static struct hid_report *hid_get_report(struct hid_report_enum *report_enum,
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return report;
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}
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/*
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* Implement a generic .request() callback, using .raw_request()
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* DO NOT USE in hid drivers directly, but through hid_hw_request instead.
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*/
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void __hid_request(struct hid_device *hid, struct hid_report *report,
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int reqtype)
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{
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char *buf;
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int ret;
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int len;
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if (!hid->ll_driver->raw_request)
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return;
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buf = hid_alloc_report_buf(report, GFP_KERNEL);
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if (!buf)
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return;
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len = hid_report_len(report);
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if (reqtype == HID_REQ_SET_REPORT)
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hid_output_report(report, buf);
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ret = hid->ll_driver->raw_request(hid, report->id, buf, len,
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report->type, reqtype);
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if (ret < 0) {
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dbg_hid("unable to complete request: %d\n", ret);
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goto out;
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}
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if (reqtype == HID_REQ_GET_REPORT)
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hid_input_report(hid, report->type, buf, ret, 0);
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out:
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kfree(buf);
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}
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EXPORT_SYMBOL_GPL(__hid_request);
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int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
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int interrupt)
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{
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@ -753,6 +753,7 @@ struct hid_field *hidinput_get_led_field(struct hid_device *hid);
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unsigned int hidinput_count_leds(struct hid_device *hid);
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__s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code);
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void hid_output_report(struct hid_report *report, __u8 *data);
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void __hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype);
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u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags);
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struct hid_device *hid_allocate_device(void);
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struct hid_report *hid_register_report(struct hid_device *device, unsigned type, unsigned id);
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@ -965,7 +966,9 @@ static inline void hid_hw_request(struct hid_device *hdev,
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struct hid_report *report, int reqtype)
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{
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if (hdev->ll_driver->request)
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hdev->ll_driver->request(hdev, report, reqtype);
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return hdev->ll_driver->request(hdev, report, reqtype);
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__hid_request(hdev, report, reqtype);
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}
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/**
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