HID: uhid: Add UHID_CREATE2 + UHID_INPUT2
UHID_CREATE2: HID report descriptor data (rd_data) is an array in struct uhid_create2_req, instead of a pointer. Enables use from languages that don't support pointers, e.g. Python. UHID_INPUT2: Data array is the last field of struct uhid_input2_req. Enables userspace to write only the required bytes to kernel (ev.type + ev.u.input2.size + the part of the data array that matters), instead of the entire struct uhid_input2_req. Note: UHID_CREATE2 increases the total size of struct uhid_event slightly, thus increasing the size of messages that are queued for userspace. However, this won't affect the userspace processing of these events. [Jiri Kosina <jkosina@suse.cz>: adjust to hid_get_raw_report() and hid_output_raw_report() API changes] Signed-off-by: Petri Gynther <pgynther@google.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
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@ -93,6 +93,11 @@ the request was handled successfully.
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event to the kernel. The payload is of type struct uhid_create_req and
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contains information about your device. You can start I/O now.
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UHID_CREATE2:
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Same as UHID_CREATE, but the HID report descriptor data (rd_data) is an array
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inside struct uhid_create2_req, instead of a pointer to a separate array.
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Enables use from languages that don't support pointers, e.g. Python.
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UHID_DESTROY:
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This destroys the internal HID device. No further I/O will be accepted. There
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may still be pending messages that you can receive with read() but no further
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@ -105,6 +110,12 @@ the request was handled successfully.
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contains a data-payload. This is the raw data that you read from your device.
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The kernel will parse the HID reports and react on it.
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UHID_INPUT2:
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Same as UHID_INPUT, but the data array is the last field of uhid_input2_req.
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Enables userspace to write only the required bytes to kernel (ev.type +
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ev.u.input2.size + the part of the data array that matters), instead of
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the entire struct uhid_input2_req.
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UHID_FEATURE_ANSWER:
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If you receive a UHID_FEATURE request you must answer with this request. You
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must copy the "id" field from the request into the answer. Set the "err" field
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@ -428,6 +428,67 @@ err_free:
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return ret;
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}
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static int uhid_dev_create2(struct uhid_device *uhid,
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const struct uhid_event *ev)
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{
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struct hid_device *hid;
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int ret;
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if (uhid->running)
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return -EALREADY;
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uhid->rd_size = ev->u.create2.rd_size;
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if (uhid->rd_size <= 0 || uhid->rd_size > HID_MAX_DESCRIPTOR_SIZE)
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return -EINVAL;
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uhid->rd_data = kmalloc(uhid->rd_size, GFP_KERNEL);
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if (!uhid->rd_data)
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return -ENOMEM;
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memcpy(uhid->rd_data, ev->u.create2.rd_data, uhid->rd_size);
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hid = hid_allocate_device();
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if (IS_ERR(hid)) {
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ret = PTR_ERR(hid);
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goto err_free;
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}
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strncpy(hid->name, ev->u.create2.name, 127);
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hid->name[127] = 0;
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strncpy(hid->phys, ev->u.create2.phys, 63);
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hid->phys[63] = 0;
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strncpy(hid->uniq, ev->u.create2.uniq, 63);
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hid->uniq[63] = 0;
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hid->ll_driver = &uhid_hid_driver;
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hid->bus = ev->u.create2.bus;
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hid->vendor = ev->u.create2.vendor;
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hid->product = ev->u.create2.product;
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hid->version = ev->u.create2.version;
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hid->country = ev->u.create2.country;
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hid->driver_data = uhid;
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hid->dev.parent = uhid_misc.this_device;
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uhid->hid = hid;
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uhid->running = true;
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ret = hid_add_device(hid);
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if (ret) {
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hid_err(hid, "Cannot register HID device\n");
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goto err_hid;
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}
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return 0;
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err_hid:
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hid_destroy_device(hid);
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uhid->hid = NULL;
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uhid->running = false;
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err_free:
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kfree(uhid->rd_data);
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return ret;
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}
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static int uhid_dev_destroy(struct uhid_device *uhid)
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{
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if (!uhid->running)
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@ -456,6 +517,17 @@ static int uhid_dev_input(struct uhid_device *uhid, struct uhid_event *ev)
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return 0;
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}
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static int uhid_dev_input2(struct uhid_device *uhid, struct uhid_event *ev)
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{
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if (!uhid->running)
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return -EINVAL;
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hid_input_report(uhid->hid, HID_INPUT_REPORT, ev->u.input2.data,
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min_t(size_t, ev->u.input2.size, UHID_DATA_MAX), 0);
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return 0;
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}
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static int uhid_dev_feature_answer(struct uhid_device *uhid,
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struct uhid_event *ev)
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{
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@ -592,12 +664,18 @@ static ssize_t uhid_char_write(struct file *file, const char __user *buffer,
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case UHID_CREATE:
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ret = uhid_dev_create(uhid, &uhid->input_buf);
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break;
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case UHID_CREATE2:
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ret = uhid_dev_create2(uhid, &uhid->input_buf);
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break;
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case UHID_DESTROY:
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ret = uhid_dev_destroy(uhid);
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break;
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case UHID_INPUT:
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ret = uhid_dev_input(uhid, &uhid->input_buf);
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break;
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case UHID_INPUT2:
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ret = uhid_dev_input2(uhid, &uhid->input_buf);
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break;
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case UHID_FEATURE_ANSWER:
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ret = uhid_dev_feature_answer(uhid, &uhid->input_buf);
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break;
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@ -21,6 +21,7 @@
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#include <linux/input.h>
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#include <linux/types.h>
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#include <linux/hid.h>
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enum uhid_event_type {
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UHID_CREATE,
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@ -34,6 +35,8 @@ enum uhid_event_type {
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UHID_INPUT,
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UHID_FEATURE,
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UHID_FEATURE_ANSWER,
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UHID_CREATE2,
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UHID_INPUT2,
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};
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struct uhid_create_req {
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@ -50,6 +53,19 @@ struct uhid_create_req {
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__u32 country;
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} __attribute__((__packed__));
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struct uhid_create2_req {
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__u8 name[128];
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__u8 phys[64];
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__u8 uniq[64];
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__u16 rd_size;
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__u16 bus;
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__u32 vendor;
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__u32 product;
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__u32 version;
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__u32 country;
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__u8 rd_data[HID_MAX_DESCRIPTOR_SIZE];
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} __attribute__((__packed__));
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#define UHID_DATA_MAX 4096
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enum uhid_report_type {
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@ -63,6 +79,11 @@ struct uhid_input_req {
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__u16 size;
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} __attribute__((__packed__));
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struct uhid_input2_req {
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__u16 size;
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__u8 data[UHID_DATA_MAX];
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} __attribute__((__packed__));
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struct uhid_output_req {
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__u8 data[UHID_DATA_MAX];
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__u16 size;
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@ -100,6 +121,8 @@ struct uhid_event {
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struct uhid_output_ev_req output_ev;
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struct uhid_feature_req feature;
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struct uhid_feature_answer_req feature_answer;
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struct uhid_create2_req create2;
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struct uhid_input2_req input2;
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} u;
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} __attribute__((__packed__));
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