| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * ISHTP-HID glue driver. |
| * |
| * Copyright (c) 2012-2016, Intel Corporation. |
| */ |
| |
| #include <linux/hid.h> |
| #include <linux/intel-ish-client-if.h> |
| #include <uapi/linux/input.h> |
| #include "ishtp-hid.h" |
| |
| /** |
| * ishtp_hid_parse() - hid-core .parse() callback |
| * @hid: hid device instance |
| * |
| * This function gets called during call to hid_add_device |
| * |
| * Return: 0 on success and non zero on error |
| */ |
| static int ishtp_hid_parse(struct hid_device *hid) |
| { |
| struct ishtp_hid_data *hid_data = hid->driver_data; |
| struct ishtp_cl_data *client_data = hid_data->client_data; |
| int rv; |
| |
| rv = hid_parse_report(hid, client_data->report_descr[hid_data->index], |
| client_data->report_descr_size[hid_data->index]); |
| if (rv) |
| return rv; |
| |
| return 0; |
| } |
| |
| /* Empty callbacks with success return code */ |
| static int ishtp_hid_start(struct hid_device *hid) |
| { |
| return 0; |
| } |
| |
| static void ishtp_hid_stop(struct hid_device *hid) |
| { |
| } |
| |
| static int ishtp_hid_open(struct hid_device *hid) |
| { |
| return 0; |
| } |
| |
| static void ishtp_hid_close(struct hid_device *hid) |
| { |
| } |
| |
| static int ishtp_raw_request(struct hid_device *hid, unsigned char reportnum, |
| __u8 *buf, size_t len, unsigned char rtype, |
| int reqtype) |
| { |
| struct ishtp_hid_data *hid_data = hid->driver_data; |
| char *ishtp_buf = NULL; |
| size_t ishtp_buf_len; |
| unsigned int header_size = sizeof(struct hostif_msg); |
| |
| if (rtype == HID_OUTPUT_REPORT) |
| return -EINVAL; |
| |
| hid_data->request_done = false; |
| switch (reqtype) { |
| case HID_REQ_GET_REPORT: |
| hid_data->raw_buf = buf; |
| hid_data->raw_buf_size = len; |
| hid_data->raw_get_req = true; |
| |
| hid_ishtp_get_report(hid, reportnum, rtype); |
| break; |
| case HID_REQ_SET_REPORT: |
| /* |
| * Spare 7 bytes for 64b accesses through |
| * get/put_unaligned_le64() |
| */ |
| ishtp_buf_len = len + header_size; |
| ishtp_buf = kzalloc(ishtp_buf_len + 7, GFP_KERNEL); |
| if (!ishtp_buf) |
| return -ENOMEM; |
| |
| memcpy(ishtp_buf + header_size, buf, len); |
| hid_ishtp_set_feature(hid, ishtp_buf, ishtp_buf_len, reportnum); |
| kfree(ishtp_buf); |
| break; |
| } |
| |
| hid_hw_wait(hid); |
| |
| return len; |
| } |
| |
| /** |
| * ishtp_hid_request() - hid-core .request() callback |
| * @hid: hid device instance |
| * @rep: pointer to hid_report |
| * @reqtype: type of req. [GET|SET]_REPORT |
| * |
| * This function is used to set/get feaure/input report. |
| */ |
| static void ishtp_hid_request(struct hid_device *hid, struct hid_report *rep, |
| int reqtype) |
| { |
| struct ishtp_hid_data *hid_data = hid->driver_data; |
| /* the specific report length, just HID part of it */ |
| unsigned int len = ((rep->size - 1) >> 3) + 1 + (rep->id > 0); |
| char *buf; |
| unsigned int header_size = sizeof(struct hostif_msg); |
| |
| len += header_size; |
| |
| hid_data->request_done = false; |
| switch (reqtype) { |
| case HID_REQ_GET_REPORT: |
| hid_data->raw_get_req = false; |
| hid_ishtp_get_report(hid, rep->id, rep->type); |
| break; |
| case HID_REQ_SET_REPORT: |
| /* |
| * Spare 7 bytes for 64b accesses through |
| * get/put_unaligned_le64() |
| */ |
| buf = kzalloc(len + 7, GFP_KERNEL); |
| if (!buf) |
| return; |
| |
| hid_output_report(rep, buf + header_size); |
| hid_ishtp_set_feature(hid, buf, len, rep->id); |
| kfree(buf); |
| break; |
| } |
| } |
| |
| /** |
| * ishtp_wait_for_response() - hid-core .wait() callback |
| * @hid: hid device instance |
| * |
| * This function is used to wait after get feaure/input report. |
| * |
| * Return: 0 on success and non zero on error |
| */ |
| static int ishtp_wait_for_response(struct hid_device *hid) |
| { |
| struct ishtp_hid_data *hid_data = hid->driver_data; |
| int rv; |
| |
| hid_ishtp_trace(client_data, "%s hid %p\n", __func__, hid); |
| |
| rv = ishtp_hid_link_ready_wait(hid_data->client_data); |
| if (rv) |
| return rv; |
| |
| if (!hid_data->request_done) |
| wait_event_interruptible_timeout(hid_data->hid_wait, |
| hid_data->request_done, 3 * HZ); |
| |
| if (!hid_data->request_done) { |
| hid_err(hid, |
| "timeout waiting for response from ISHTP device\n"); |
| return -ETIMEDOUT; |
| } |
| hid_ishtp_trace(client_data, "%s hid %p done\n", __func__, hid); |
| |
| hid_data->request_done = false; |
| |
| return 0; |
| } |
| |
| /** |
| * ishtp_hid_wakeup() - Wakeup caller |
| * @hid: hid device instance |
| * |
| * This function will wakeup caller waiting for Get/Set feature report |
| */ |
| void ishtp_hid_wakeup(struct hid_device *hid) |
| { |
| struct ishtp_hid_data *hid_data = hid->driver_data; |
| |
| hid_data->request_done = true; |
| wake_up_interruptible(&hid_data->hid_wait); |
| } |
| |
| static const struct hid_ll_driver ishtp_hid_ll_driver = { |
| .parse = ishtp_hid_parse, |
| .start = ishtp_hid_start, |
| .stop = ishtp_hid_stop, |
| .open = ishtp_hid_open, |
| .close = ishtp_hid_close, |
| .request = ishtp_hid_request, |
| .wait = ishtp_wait_for_response, |
| .raw_request = ishtp_raw_request |
| }; |
| |
| /** |
| * ishtp_hid_probe() - hid register ll driver |
| * @cur_hid_dev: Index of hid device calling to register |
| * @client_data: Client data pointer |
| * |
| * This function is used to allocate and add HID device. |
| * |
| * Return: 0 on success, non zero on error |
| */ |
| int ishtp_hid_probe(unsigned int cur_hid_dev, |
| struct ishtp_cl_data *client_data) |
| { |
| int rv; |
| struct hid_device *hid; |
| struct ishtp_hid_data *hid_data; |
| |
| hid = hid_allocate_device(); |
| if (IS_ERR(hid)) |
| return PTR_ERR(hid); |
| |
| hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL); |
| if (!hid_data) { |
| rv = -ENOMEM; |
| goto err_hid_data; |
| } |
| |
| hid_data->index = cur_hid_dev; |
| hid_data->client_data = client_data; |
| init_waitqueue_head(&hid_data->hid_wait); |
| |
| hid->driver_data = hid_data; |
| |
| client_data->hid_sensor_hubs[cur_hid_dev] = hid; |
| |
| hid->ll_driver = &ishtp_hid_ll_driver; |
| hid->bus = BUS_INTEL_ISHTP; |
| hid->dev.parent = ishtp_device(client_data->cl_device); |
| |
| hid->version = le16_to_cpu(ISH_HID_VERSION); |
| hid->vendor = le16_to_cpu(client_data->hid_devices[cur_hid_dev].vid); |
| hid->product = le16_to_cpu(client_data->hid_devices[cur_hid_dev].pid); |
| snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-ishtp", |
| hid->vendor, hid->product); |
| |
| rv = hid_add_device(hid); |
| if (rv) |
| goto err_hid_device; |
| |
| hid_ishtp_trace(client_data, "%s allocated hid %p\n", __func__, hid); |
| |
| return 0; |
| |
| err_hid_device: |
| kfree(hid_data); |
| err_hid_data: |
| hid_destroy_device(hid); |
| return rv; |
| } |
| |
| /** |
| * ishtp_hid_remove() - Remove registered hid device |
| * @client_data: client data pointer |
| * |
| * This function is used to destroy allocatd HID device. |
| */ |
| void ishtp_hid_remove(struct ishtp_cl_data *client_data) |
| { |
| int i; |
| |
| for (i = 0; i < client_data->num_hid_devices; ++i) { |
| if (client_data->hid_sensor_hubs[i]) { |
| kfree(client_data->hid_sensor_hubs[i]->driver_data); |
| hid_destroy_device(client_data->hid_sensor_hubs[i]); |
| client_data->hid_sensor_hubs[i] = NULL; |
| } |
| } |
| } |