[RFC 4/4] hid: intel-ish-hid: ISH HID client driver

Srinivas Pandruvada
2016-05-31T04:29:35Z

From: Daniel Drubin <daniel.drubin@intel.com>

This driver is responsible for implementing ISH HID client, which
gets HID description and report. Once it has completely gets
report descriptors, it registers as a HID LL drivers. This implements
necessary callbacks so that it can be used by HID sensor hub driver.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
drivers/hid/intel-ish-hid/Makefile | 4 +
drivers/hid/intel-ish-hid/ishtp-hid-client.c | 672 +++++++++++++++++++++++++++
drivers/hid/intel-ish-hid/ishtp-hid.c | 201 ++++++++
drivers/hid/intel-ish-hid/ishtp-hid.h | 157 +++++++
4 files changed, 1034 insertions(+)
create mode 100644 drivers/hid/intel-ish-hid/ishtp-hid-client.c
create mode 100644 drivers/hid/intel-ish-hid/ishtp-hid.c
create mode 100644 drivers/hid/intel-ish-hid/ishtp-hid.h

diff --git a/drivers/hid/intel-ish-hid/Makefile b/drivers/hid/intel-ish-hid/Makefile
index 2c83cb9..6727c66 100644
--- a/drivers/hid/intel-ish-hid/Makefile
+++ b/drivers/hid/intel-ish-hid/Makefile
@@ -13,4 +13,8 @@ obj-$(CONFIG_INTEL_ISH_HID_IPC) += intel-ish-ipc.o
intel-ish-ipc-objs := ipc/ipc.o
intel-ish-ipc-objs += ipc/pci-ish.o

+obj-$(CONFIG_INTEL_ISH_HID) += intel-ishtp-hid.o
+intel-ishtp-hid-objs := ishtp-hid.o
+intel-ishtp-hid-objs += ishtp-hid-client.o
+
ccflags-y += -Idrivers/hid/intel-ish-hid/ishtp
diff --git a/drivers/hid/intel-ish-hid/ishtp-hid-client.c b/drivers/hid/intel-ish-hid/ishtp-hid-client.c
new file mode 100644
index 0000000..5d22be6
--- /dev/null
+++ b/drivers/hid/intel-ish-hid/ishtp-hid-client.c
@@ -0,0 +1,672 @@
+/*
+ * ISHTP client driver for HID (ISH)
+ *
+ * Copyright (c) 2014-2016, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/module.h>
+#include <linux/hid.h>
+#include "ishtp/ishtp-dev.h"
+#include "ishtp/client.h"
+#include "ishtp-hid.h"
+
+/* Rx ring buffer pool size */
+#define HID_CL_RX_RING_SIZE 32
+#define HID_CL_TX_RING_SIZE 16
+
+/**
+ * report_bad_packets() - Report bad packets
+ * @hid_ishtp_cl: Client instance to get stats
+ * @recv_buf: Raw received host interface message
+ * @cur_pos: Current position index in payload
+ * @payload_len: Length of payload expected
+ *
+ * Dumps error in case bad packet is received
+ */
+static void report_bad_packet(struct ishtp_cl *hid_ishtp_cl, void *recv_buf,
+ size_t cur_pos, size_t payload_len)
+{
+ struct hostif_msg *recv_msg = recv_buf;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+
+ dev_err(&hid_ishtp_cl->device->dev, "[hid-ish]: BAD packet %02X\n"
+ "total_bad=%u cur_pos=%u\n"
+ "[%02X %02X %02X %02X]\n"
+ "payload_len=%u\n"
+ "multi_packet_cnt=%u\n"
+ "is_response=%02X\n",
+ recv_msg->hdr.command, client_data->bad_recv_cnt,
+ (unsigned int)cur_pos,
+ ((unsigned char *)recv_msg)[0], ((unsigned char *)recv_msg)[1],
+ ((unsigned char *)recv_msg)[2], ((unsigned char *)recv_msg)[3],
+ (unsigned int)payload_len, client_data->multi_packet_cnt,
+ recv_msg->hdr.command & ~CMD_MASK);
+}
+
+/**
+ * process_recv() - Received and parse incoming packet
+ * @hid_ishtp_cl: Client instance to get stats
+ * @recv_buf: Raw received host interface message
+ * @data_len: length of the message
+ *
+ * Parse the incoming packet. If it is a response packet then it will update
+ * per instance flags and wake up the caller waiting to for the response.
+ */
+static void process_recv(struct ishtp_cl *hid_ishtp_cl, void *recv_buf,
+ size_t data_len)
+{
+ struct hostif_msg *recv_msg;
+ unsigned char *payload;
+ struct device_info *dev_info;
+ int i, j;
+ size_t payload_len, total_len, cur_pos;
+ int report_type;
+ struct report_list *reports_list;
+ char *reports;
+ size_t report_len;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+
+ if (data_len < sizeof(struct hostif_msg_hdr)) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: error, received %u which is "
+ "less than data header %u\n",
+ (unsigned int)data_len,
+ (unsigned int)sizeof(struct hostif_msg_hdr));
+ ++client_data->bad_recv_cnt;
+ ish_hw_reset(hid_ishtp_cl->dev);
+ return;
+ }
+
+ payload = recv_buf + sizeof(struct hostif_msg_hdr);
+ total_len = data_len;
+ cur_pos = 0;
+
+ do {
+ recv_msg = (struct hostif_msg *)(recv_buf + cur_pos);
+ payload_len = recv_msg->hdr.size;
+
+ /* Sanity checks */
+ if (cur_pos + payload_len + sizeof(struct hostif_msg) >
+ total_len) {
+ ++client_data->bad_recv_cnt;
+ report_bad_packet(hid_ishtp_cl, recv_msg, cur_pos,
+ payload_len);
+ ish_hw_reset(hid_ishtp_cl->dev);
+ break;
+ }
+
+
+ switch (recv_msg->hdr.command & CMD_MASK) {
+ case HOSTIF_DM_ENUM_DEVICES:
+ if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
+ client_data->init_done)) {
+ ++client_data->bad_recv_cnt;
+ report_bad_packet(hid_ishtp_cl, recv_msg,
+ cur_pos,
+ payload_len);
+ ish_hw_reset(hid_ishtp_cl->dev);
+ break;
+ }
+ client_data->hid_dev_count = (unsigned int)*payload;
+ client_data->hid_devices = devm_kzalloc(
+ &hid_ishtp_cl->device->dev,
+ client_data->hid_dev_count *
+ sizeof(struct device_info),
+ GFP_KERNEL);
+ if (!client_data->hid_devices) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "Mem alloc failed for hid device info\n");
+ wake_up(&client_data->init_wait);
+ break;
+ }
+ for (i = 0; i < client_data->hid_dev_count; ++i) {
+ if (1 + sizeof(struct device_info) * i >=
+ payload_len) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: [ENUM_DEVICES]:"
+ " content size %lu "
+ "is bigger than "
+ "payload_len %u\n",
+ 1 + sizeof(struct device_info)
+ * i,
+ (unsigned int)payload_len);
+ }
+
+ if (1 + sizeof(struct device_info) * i >=
+ data_len)
+ break;
+
+ dev_info = (struct device_info *)(payload + 1 +
+ sizeof(struct device_info) * i);
+ if (client_data->hid_devices)
+ memcpy(client_data->hid_devices + i,
+ dev_info,
+ sizeof(struct device_info));
+ }
+
+ client_data->enum_devices_done = 1;
+ wake_up(&client_data->init_wait);
+
+ break;
+
+ case HOSTIF_GET_HID_DESCRIPTOR:
+ if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
+ client_data->init_done)) {
+ ++client_data->bad_recv_cnt;
+ report_bad_packet(hid_ishtp_cl, recv_msg,
+ cur_pos,
+ payload_len);
+ ish_hw_reset(hid_ishtp_cl->dev);
+ break;
+ }
+ client_data->hid_descr[client_data->cur_hid_dev] =
+ devm_kmalloc(&hid_ishtp_cl->device->dev,
+ payload_len, GFP_KERNEL);
+ if (client_data->hid_descr[client_data->cur_hid_dev]) {
+ memcpy(client_data->hid_descr[
+ client_data->cur_hid_dev],
+ payload, payload_len);
+ client_data->hid_descr_size[
+ client_data->cur_hid_dev] = payload_len;
+ client_data->hid_descr_done = 1;
+ }
+ wake_up(&client_data->init_wait);
+
+ break;
+
+ case HOSTIF_GET_REPORT_DESCRIPTOR:
+ if ((!(recv_msg->hdr.command & ~CMD_MASK) ||
+ client_data->init_done)) {
+ ++client_data->bad_recv_cnt;
+ report_bad_packet(hid_ishtp_cl, recv_msg,
+ cur_pos,
+ payload_len);
+ ish_hw_reset(hid_ishtp_cl->dev);
+ break;
+ }
+ client_data->report_descr[client_data->cur_hid_dev] =
+ devm_kmalloc(&hid_ishtp_cl->device->dev,
+ payload_len, GFP_KERNEL);
+ if (client_data->report_descr[
+ client_data->cur_hid_dev]) {
+ memcpy(client_data->report_descr[
+ client_data->cur_hid_dev], payload,
+ payload_len);
+ client_data->report_descr_size[
+ client_data->cur_hid_dev] = payload_len;
+ client_data->report_descr_done = 1;
+ }
+ wake_up(&client_data->init_wait);
+
+ break;
+
+ case HOSTIF_GET_FEATURE_REPORT:
+ report_type = HID_FEATURE_REPORT;
+ goto do_get_report;
+
+ case HOSTIF_GET_INPUT_REPORT:
+ report_type = HID_INPUT_REPORT;
+do_get_report:
+ /* Get index of device that matches this id */
+ for (i = 0; i < client_data->num_hid_devices; ++i) {
+ if (recv_msg->hdr.device_id ==
+ client_data->hid_devices[i].dev_id)
+ if (client_data->hid_sensor_hubs[i]) {
+ hid_input_report(
+ client_data->hid_sensor_hubs[
+ i],
+ report_type, payload,
+ payload_len, 0);
+ break;
+ }
+ }
+ client_data->get_report_done = 1;
+ wake_up(&client_data->ishtp_hid_wait);
+ break;
+
+ case HOSTIF_SET_FEATURE_REPORT:
+ client_data->get_report_done = 1;
+ wake_up(&client_data->ishtp_hid_wait);
+ break;
+
+ case HOSTIF_PUBLISH_INPUT_REPORT:
+ report_type = HID_INPUT_REPORT;
+ for (i = 0; i < client_data->num_hid_devices; ++i)
+ if (recv_msg->hdr.device_id ==
+ client_data->hid_devices[i].dev_id)
+ if (client_data->hid_sensor_hubs[i])
+ hid_input_report(
+ client_data->hid_sensor_hubs[
+ i],
+ report_type, payload,
+ payload_len, 0);
+ break;
+
+ case HOSTIF_PUBLISH_INPUT_REPORT_LIST:
+ report_type = HID_INPUT_REPORT;
+ reports_list = (struct report_list *)payload;
+ reports = (char *)reports_list->reports;
+
+ for (j = 0; j < reports_list->num_of_reports; j++) {
+ recv_msg = (struct hostif_msg *)(reports +
+ sizeof(uint16_t));
+ report_len = *(uint16_t *)reports;
+ payload = reports + sizeof(uint16_t) +
+ sizeof(struct hostif_msg_hdr);
+ payload_len = report_len -
+ sizeof(struct hostif_msg_hdr);
+
+ for (i = 0; i < client_data->num_hid_devices;
+ ++i)
+ if (recv_msg->hdr.device_id ==
+ client_data->hid_devices[i].dev_id &&
+ client_data->hid_sensor_hubs[i]) {
+ hid_input_report(
+ client_data->hid_sensor_hubs[
+ i],
+ report_type,
+ payload, payload_len,
+ 0);
+ }
+
+ reports += sizeof(uint16_t) + report_len;
+ }
+ break;
+ default:
+ ++client_data->bad_recv_cnt;
+ report_bad_packet(hid_ishtp_cl, recv_msg, cur_pos,
+ payload_len);
+ ish_hw_reset(hid_ishtp_cl->dev);
+ break;
+
+ }
+
+ if (!cur_pos && cur_pos + payload_len +
+ sizeof(struct hostif_msg) < total_len)
+ ++client_data->multi_packet_cnt;
+
+ cur_pos += payload_len + sizeof(struct hostif_msg);
+ payload += payload_len + sizeof(struct hostif_msg);
+
+ } while (cur_pos < total_len);
+}
+
+/**
+ * ish_cl_event_cb() - bus driver callback for incoming message/packet
+ * @device: Pointer to the the ishtp client device for which this message
+ * is targeted
+ *
+ * Remove the packet from the list and process the message by calling
+ * process_recv
+ */
+static void ish_cl_event_cb(struct ishtp_cl_device *device)
+{
+ struct ishtp_cl *hid_ishtp_cl = device->driver_data;
+ struct ishtp_cl_rb *rb_in_proc;
+ size_t r_length;
+ unsigned long flags;
+
+ if (!hid_ishtp_cl)
+ return;
+
+ spin_lock_irqsave(&hid_ishtp_cl->in_process_spinlock, flags);
+ while (!list_empty(&hid_ishtp_cl->in_process_list.list)) {
+ rb_in_proc = list_entry(
+ hid_ishtp_cl->in_process_list.list.next,
+ struct ishtp_cl_rb, list);
+ list_del_init(&rb_in_proc->list);
+ spin_unlock_irqrestore(&hid_ishtp_cl->in_process_spinlock,
+ flags);
+
+ if (!rb_in_proc->buffer.data)
+ return;
+
+ r_length = rb_in_proc->buf_idx;
+
+ /* decide what to do with received data */
+ process_recv(hid_ishtp_cl, rb_in_proc->buffer.data, r_length);
+
+ ishtp_io_rb_recycle(rb_in_proc);
+ spin_lock_irqsave(&hid_ishtp_cl->in_process_spinlock, flags);
+ }
+ spin_unlock_irqrestore(&hid_ishtp_cl->in_process_spinlock, flags);
+}
+
+/**
+ * hid_ishtp_set_feature() - send request to ISH FW to set a feature request
+ * @hid: hid device instance for this request
+ * @buf: feature buffer
+ * @len: Length of feature buffer
+ * @report_id: Report id for the feature set request
+ *
+ * This is called from hid core .request() callback. This function doesn't wait
+ * for response.
+ */
+void hid_ishtp_set_feature(struct hid_device *hid, char *buf, unsigned int len,
+ int report_id)
+{
+ struct ishtp_cl *hid_ishtp_cl = hid->driver_data;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+ struct hostif_msg *msg = (struct hostif_msg *)buf;
+ int rv;
+ int i;
+
+ memset(msg, 0, sizeof(struct hostif_msg));
+ msg->hdr.command = HOSTIF_SET_FEATURE_REPORT;
+ for (i = 0; i < client_data->num_hid_devices; ++i) {
+ if (hid == client_data->hid_sensor_hubs[i]) {
+ msg->hdr.device_id =
+ client_data->hid_devices[i].dev_id;
+ break;
+ }
+ }
+
+ if (i == client_data->num_hid_devices)
+ return;
+
+ rv = ishtp_cl_send(hid_ishtp_cl, buf, len);
+}
+
+/**
+ * hid_ishtp_get_report() - request to get feature/input report
+ * @hid: hid device instance for this request
+ * @report_id: Report id for the get request
+ * @report_type: Report type for the this request
+ *
+ * This is called from hid core .request() callback. This function will send
+ * request to FW and return without waiting for response.
+ */
+void hid_ishtp_get_report(struct hid_device *hid, int report_id,
+ int report_type)
+{
+ struct ishtp_cl *hid_ishtp_cl = hid->driver_data;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+ static unsigned char buf[10];
+ unsigned int len;
+ struct hostif_msg_to_sensor *msg = (struct hostif_msg_to_sensor *)buf;
+ int rv;
+ int i;
+
+ len = sizeof(struct hostif_msg_to_sensor);
+
+ memset(msg, 0, sizeof(struct hostif_msg_to_sensor));
+ msg->hdr.command = (report_type == HID_FEATURE_REPORT) ?
+ HOSTIF_GET_FEATURE_REPORT : HOSTIF_GET_INPUT_REPORT;
+ for (i = 0; i < client_data->num_hid_devices; ++i) {
+ if (hid == client_data->hid_sensor_hubs[i]) {
+ msg->hdr.device_id =
+ client_data->hid_devices[i].dev_id;
+ break;
+ }
+ }
+
+ if (i == client_data->num_hid_devices)
+ return;
+
+ msg->report_id = report_id;
+ rv = ishtp_cl_send(hid_ishtp_cl, buf, len);
+}
+
+/**
+ * hid_ishtp_cl_init() - Init function for ISHTP client
+ * @hid_istp_cl: ISHTP client instance
+ *
+ * This function complete the initializtion of the client. The summary of
+ * processing:
+ * - Send request to enumerate the hid clients
+ * Get the HID descriptor for each enumearated device
+ * Get report description of each device
+ * Register each device wik hid core by calling ishtp_hid_probe
+ */
+static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl)
+{
+ static unsigned char buf[512];
+ unsigned int len;
+ struct hostif_msg *msg = (struct hostif_msg *)buf;
+ struct ishtp_device *dev;
+ int retry_count;
+ unsigned long flags;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+ int i;
+ int rv;
+
+ init_waitqueue_head(&client_data->init_wait);
+ init_waitqueue_head(&client_data->ishtp_hid_wait);
+
+ rv = ishtp_cl_link(hid_ishtp_cl, ISHTP_HOST_CLIENT_ID_ANY);
+ if (rv)
+ return -ENOMEM;
+
+ client_data->init_done = 0;
+
+ dev = hid_ishtp_cl->dev;
+
+ /* Connect to FW client */
+ hid_ishtp_cl->rx_ring_size = HID_CL_RX_RING_SIZE;
+ hid_ishtp_cl->tx_ring_size = HID_CL_TX_RING_SIZE;
+
+ spin_lock_irqsave(&dev->fw_clients_lock, flags);
+ i = ishtp_fw_cl_by_uuid(dev, &hid_ishtp_guid);
+ if (i < 0) {
+ spin_unlock_irqrestore(&dev->fw_clients_lock, flags);
+ return i;
+ }
+ hid_ishtp_cl->fw_client_id = dev->fw_clients[i].client_id;
+ spin_unlock_irqrestore(&dev->fw_clients_lock, flags);
+ hid_ishtp_cl->state = ISHTP_CL_CONNECTING;
+
+ rv = ishtp_cl_connect(hid_ishtp_cl);
+ if (rv)
+ goto ret;
+
+ /* Register read callback */
+ ishtp_register_event_cb(hid_ishtp_cl->device, ish_cl_event_cb);
+
+ /* Send HOSTIF_DM_ENUM_DEVICES */
+ memset(msg, 0, sizeof(struct hostif_msg));
+ msg->hdr.command = HOSTIF_DM_ENUM_DEVICES;
+ len = sizeof(struct hostif_msg);
+ rv = ishtp_cl_send(hid_ishtp_cl, buf, len);
+ if (rv)
+ goto ret;
+
+ rv = 0;
+
+ retry_count = 0;
+ while (!client_data->enum_devices_done &&
+ retry_count < 10) {
+ wait_event_timeout(client_data->init_wait,
+ client_data->enum_devices_done,
+ 3 * HZ);
+ ++retry_count;
+ if (!client_data->enum_devices_done)
+ /* Send HOSTIF_DM_ENUM_DEVICES */
+ rv = ishtp_cl_send(hid_ishtp_cl, buf, len);
+ }
+ if (!client_data->enum_devices_done) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: timed out waiting for enum_devices\n");
+ rv = -ETIMEDOUT;
+ goto ret;
+ }
+ if (!client_data->hid_devices) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: failed to allocate HID dev structures\n");
+ rv = -ENOMEM;
+ goto ret;
+ }
+
+ client_data->num_hid_devices = client_data->hid_dev_count;
+ dev_warn(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: enum_devices_done OK, num_hid_devices=%d\n",
+ client_data->num_hid_devices);
+
+ for (i = 0; i < client_data->num_hid_devices; ++i) {
+ client_data->cur_hid_dev = i;
+
+ /* Get HID descriptor */
+ client_data->hid_descr_done = 0;
+ memset(msg, 0, sizeof(struct hostif_msg));
+ msg->hdr.command = HOSTIF_GET_HID_DESCRIPTOR;
+ msg->hdr.device_id = client_data->hid_devices[i].dev_id;
+ len = sizeof(struct hostif_msg);
+ rv = ishtp_cl_send(hid_ishtp_cl, buf, len);
+ rv = 0;
+
+ if (!client_data->hid_descr_done)
+ wait_event_timeout(client_data->init_wait,
+ client_data->hid_descr_done,
+ 30 * HZ);
+ if (!client_data->hid_descr_done) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: timed out for hid_descr_done\n");
+ continue;
+ }
+
+ if (!client_data->hid_descr[i]) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: allocation HID desc fail\n");
+ continue;
+ }
+
+ /* Get report descriptor */
+ client_data->report_descr_done = 0;
+ memset(msg, 0, sizeof(struct hostif_msg));
+ msg->hdr.command = HOSTIF_GET_REPORT_DESCRIPTOR;
+ msg->hdr.device_id = client_data->hid_devices[i].dev_id;
+ len = sizeof(struct hostif_msg);
+ rv = ishtp_cl_send(hid_ishtp_cl, buf, len);
+
+ rv = 0;
+
+ if (!client_data->report_descr_done)
+ wait_event_timeout(client_data->init_wait,
+ client_data->report_descr_done,
+ 30 * HZ);
+ if (!client_data->report_descr_done) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: timed out for report descr\n");
+ continue;
+ }
+
+ if (!client_data->report_descr[i]) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: failed to alloc report descr\n");
+ continue;
+ }
+
+ rv = ishtp_hid_probe(i, hid_ishtp_cl);
+ if (rv) {
+ dev_err(&hid_ishtp_cl->device->dev,
+ "[hid-ish]: HID probe for #%u failed: %d\n",
+ i, rv);
+ continue;
+ }
+ } /* for() on all hid devices */
+
+ret:
+ client_data->init_done = 1;
+
+ return rv;
+}
+
+/**
+ * hid_ishtp_cl_probe() - ISHTP client driver probe
+ * @cl_device: ISHTP client device instance
+ *
+ * This function calls on device create on ISHTP bus
+ */
+static int hid_ishtp_cl_probe(struct ishtp_cl_device *cl_device)
+{
+ struct ishtp_cl *hid_ishtp_cl;
+ struct ishtp_cl_data *client_data;
+ int rv;
+
+ if (!cl_device)
+ return -ENODEV;
+
+ if (uuid_le_cmp(hid_ishtp_guid,
+ cl_device->fw_client->props.protocol_name) != 0)
+ return -ENODEV;
+
+ client_data = devm_kzalloc(&cl_device->dev, sizeof(*client_data),
+ GFP_KERNEL);
+ if (!client_data)
+ return -ENOMEM;
+
+ hid_ishtp_cl = ishtp_cl_allocate(cl_device->ishtp_dev);
+ if (!hid_ishtp_cl)
+ return -ENOMEM;
+
+ cl_device->driver_data = hid_ishtp_cl;
+ hid_ishtp_cl->client_data = client_data;
+
+ rv = hid_ishtp_cl_init(hid_ishtp_cl);
+ if (rv) {
+ ishtp_cl_free(hid_ishtp_cl);
+ return rv;
+ }
+
+ return 0;
+}
+
+/**
+ * hid_ishtp_cl_remove() - ISHTP client driver remove
+ * @cl_device: ISHTP client device instance
+ *
+ * This function calls on device create on ISHTP bus
+ */
+static int hid_ishtp_cl_remove(struct ishtp_cl_device *cl_device)
+{
+ struct ishtp_cl *hid_ishtp_cl = cl_device->driver_data;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+
+ ishtp_hid_remove(hid_ishtp_cl);
+
+ ishtp_cl_unlink(hid_ishtp_cl);
+ ishtp_cl_flush_queues(hid_ishtp_cl);
+
+ /* disband and free all Tx and Rx client-level rings */
+ ishtp_cl_free(hid_ishtp_cl);
+ hid_ishtp_cl = NULL;
+
+ client_data->num_hid_devices = 0;
+
+ return 0;
+}
+
+
+struct ishtp_cl_driver hid_ishtp_cl_driver = {
+ .name = "ish",
+ .probe = hid_ishtp_cl_probe,
+ .remove = hid_ishtp_cl_remove,
+};
+
+static int __init ish_hid_init(void)
+{
+ int rv;
+
+ /* Register ISHTP client device driver with ISHTP Bus */
+ rv = ishtp_cl_driver_register(&hid_ishtp_cl_driver);
+
+ return rv;
+
+}
+late_initcall(ish_hid_init);
+
+MODULE_DESCRIPTION("ISH ISHTP HID client driver");
+/* Primary author */
+MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>");
+/* Modification for multi instance support and clean up */
+MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
+
+MODULE_LICENSE("GPL");
diff --git a/drivers/hid/intel-ish-hid/ishtp-hid.c b/drivers/hid/intel-ish-hid/ishtp-hid.c
new file mode 100644
index 0000000..f0c5569
--- /dev/null
+++ b/drivers/hid/intel-ish-hid/ishtp-hid.c
@@ -0,0 +1,201 @@
+/*
+ * ISHTP-HID glue driver.
+ *
+ * Copyright (c) 2012-2016, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/hid.h>
+#include "ishtp/client.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
+ */
+static int ishtp_hid_parse(struct hid_device *hid)
+{
+ struct ishtp_cl *hid_ishtp_cl = hid->driver_data;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+ int rv;
+
+ rv = hid_parse_report(hid,
+ client_data->report_descr[client_data->cur_hid_dev],
+ client_data->report_descr_size[client_data->cur_hid_dev]);
+ 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 *hdev, unsigned char reportnum,
+ __u8 *buf, size_t len, unsigned char rtype, int reqtype)
+{
+ return 0;
+}
+
+/**
+ * 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)
+{
+ /* 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;
+
+ switch (reqtype) {
+ case HID_REQ_GET_REPORT:
+ 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.
+ */
+static int ishtp_wait_for_response(struct hid_device *hid)
+{
+ struct ishtp_cl *hid_ishtp_cl = hid->driver_data;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+
+ if (!client_data->get_report_done)
+ wait_event_timeout(client_data->ishtp_hid_wait,
+ client_data->get_report_done, 3 * HZ);
+
+ if (!client_data->get_report_done) {
+ hid_err(hid,
+ "timeout waiting for response from ISHTP device\n");
+ return -1;
+ }
+
+ client_data->get_report_done = 0;
+
+ return 0;
+}
+
+static 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
+ * @curr_hid_dev: Index of hid device calling to register
+ * @hid_ishtp_cl: ISHTP Client instance
+ *
+ * This function is used to allocate and add HID device.
+ */
+int ishtp_hid_probe(unsigned int cur_hid_dev, struct ishtp_cl *hid_ishtp_cl)
+{
+ int rv;
+ struct hid_device *hid;
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+
+ hid = hid_allocate_device();
+ if (IS_ERR(hid)) {
+ rv = PTR_ERR(hid);
+ return -ENOMEM;
+ }
+
+ hid->driver_data = hid_ishtp_cl;
+
+ client_data->hid_sensor_hubs[cur_hid_dev] = hid;
+
+ hid->ll_driver = &ishtp_hid_ll_driver;
+ hid->bus = BUS_ISHTP;
+ hid->version = le16_to_cpu(ISH_HID_VERSION);
+ hid->vendor = le16_to_cpu(ISH_HID_VENDOR);
+ hid->product = le16_to_cpu(ISH_HID_PRODUCT);
+
+ snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX", "hid-ishtp",
+ hid->vendor, hid->product);
+
+ rv = hid_add_device(hid);
+ if (rv) {
+ if (rv != -ENODEV)
+ hid_err(hid, "[hid-ishtp]: can't add HID device: %d\n",
+ rv);
+ kfree(hid);
+ return rv;
+ }
+
+ return 0;
+}
+
+/**
+ * ishtp_hid_probe() - Remove registered hid device
+ * @hid_ishtp_cl: ISHTP Client instance
+ *
+ * This function is used to destroy allocatd HID device.
+ */
+void ishtp_hid_remove(struct ishtp_cl *hid_ishtp_cl)
+{
+ struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data;
+ int i;
+
+ for (i = 0; i < client_data->num_hid_devices; ++i)
+ if (client_data->hid_sensor_hubs[i]) {
+ hid_destroy_device(client_data->hid_sensor_hubs[i]);
+ client_data->hid_sensor_hubs[i] = NULL;
+ }
+}
diff --git a/drivers/hid/intel-ish-hid/ishtp-hid.h b/drivers/hid/intel-ish-hid/ishtp-hid.h
new file mode 100644
index 0000000..9bf9198
--- /dev/null
+++ b/drivers/hid/intel-ish-hid/ishtp-hid.h
@@ -0,0 +1,157 @@
+/*
+ * ISHTP-HID glue driver's definitions.
+ *
+ * Copyright (c) 2014-2016, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#ifndef ISHTP_HID__H
+#define ISHTP_HID__H
+
+/* ISH Transport protocol id */
+#define BUS_ISHTP 0x44
+
+/* The fixed ISH product and vendor id */
+#define ISH_HID_VENDOR 0x8086
+#define ISH_HID_PRODUCT 0x22D8
+#define ISH_HID_VERSION 0x0200
+
+#define CMD_MASK 0x7F
+#define IS_RESPONSE 0x80
+
+/* ISH Transport protocol (ISHTP in short) GUID */
+static const uuid_le hid_ishtp_guid = UUID_LE(0x33AECD58, 0xB679, 0x4E54,
+ 0x9B, 0xD9, 0xA0, 0x4D, 0x34,
+ 0xF0, 0xC2, 0x26);
+
+/* ISH HID message structure */
+struct hostif_msg_hdr {
+ uint8_t command; /* Bit 7: is_response */
+ uint8_t device_id;
+ uint8_t status;
+ uint8_t flags;
+ uint16_t size;
+} __packed;
+
+struct hostif_msg {
+ struct hostif_msg_hdr hdr;
+} __packed;
+
+struct hostif_msg_to_sensor {
+ struct hostif_msg_hdr hdr;
+ uint8_t report_id;
+} __packed;
+
+struct device_info {
+ uint32_t dev_id;
+ uint8_t dev_class;
+ uint16_t pid;
+ uint16_t vid;
+} __packed;
+
+struct ishtp_version {
+ uint8_t major;
+ uint8_t minor;
+ uint8_t hotfix;
+ uint16_t build;
+} __packed;
+
+/* struct for ISHTP aggregated input data */
+struct report_list {
+ uint16_t total_size;
+ uint8_t num_of_reports;
+ uint8_t flags;
+ struct {
+ uint16_t size_of_report;
+ uint8_t report[1];
+ } __packed reports[1];
+} __packed;
+
+/* HOSTIF commands */
+#define HOSTIF_HID_COMMAND_BASE 0
+#define HOSTIF_GET_HID_DESCRIPTOR 0
+#define HOSTIF_GET_REPORT_DESCRIPTOR 1
+#define HOSTIF_GET_FEATURE_REPORT 2
+#define HOSTIF_SET_FEATURE_REPORT 3
+#define HOSTIF_GET_INPUT_REPORT 4
+#define HOSTIF_PUBLISH_INPUT_REPORT 5
+#define HOSTIF_PUBLISH_INPUT_REPORT_LIST 6
+#define HOSTIF_DM_COMMAND_BASE 32
+#define HOSTIF_DM_ENUM_DEVICES 33
+#define HOSTIF_DM_ADD_DEVICE 34
+
+#define MAX_HID_DEVICES 32
+
+/**
+ * struct ishtp_cl_data - Encapsulate per ISH TP HID Client
+ * @enum_device_done: Enum devices response complete flag
+ * @hid_descr_done: HID descriptor complete flag
+ * @report_descr_done: Get report descriptor complete flag
+ * @get_report_done: Get Feature/Input report complete flag
+ * used during get/set request from hid core
+ * @init_done: Init process completed successfully
+ * @num_hid_devices: Number of HID devices enumerated in this client
+ * @cur_hid_dev: This keeps track of the device index for which
+ * initialization and registration with HID core
+ * in progress.
+ * @hid_devices: Store vid/pid/devid for each enumerated HID device
+ * @report_descr: Stores the raw report descriptors for each HID device
+ * @report_descr_size: Report description of size of above repo_descr[]
+ * @hid_sensor_hubs: Pointer to hid_device for all HID device, so that
+ * when clients are removed, they can be freed
+ * @hid_descr: Pointer to hid descriptor for each enumerated hid
+ * device
+ * @hid_descr_size: Size of each above report descriptor
+ * @init_wait: Wait queue to wait during initialization, where the
+ * client send message to ISH FW and wait for response
+ * @ishtp_hid_wait: The wait for get report during wait callback from hid
+ * core
+ * @bad_recv_cnt: Running count of packets received with error
+ * @multi_packet_cnt: Count of fragmented packet count
+ *
+ * This structure is used to store completion flags and per client data like
+ * like report description, number of HID devices etc.
+ */
+struct ishtp_cl_data {
+ /* completion flags */
+ int enum_devices_done;
+ int hid_descr_done;
+ int report_descr_done;
+ int get_report_done;
+ int init_done;
+
+ unsigned int num_hid_devices;
+ unsigned int cur_hid_dev;
+ unsigned int hid_dev_count;
+
+ struct device_info *hid_devices;
+ unsigned char *report_descr[MAX_HID_DEVICES];
+ int report_descr_size[MAX_HID_DEVICES];
+ struct hid_device *hid_sensor_hubs[MAX_HID_DEVICES];
+ unsigned char *hid_descr[MAX_HID_DEVICES];
+ int hid_descr_size[MAX_HID_DEVICES];
+
+ wait_queue_head_t init_wait;
+ wait_queue_head_t ishtp_hid_wait;
+
+ /* Statistics */
+ unsigned int bad_recv_cnt;
+ int multi_packet_cnt;
+};
+
+/* Interface functions between HID LL driver and ISH TP client */
+void hid_ishtp_set_feature(struct hid_device *hid, char *buf, unsigned int len,
+ int report_id);
+void hid_ishtp_get_report(struct hid_device *hid, int report_id,
+ int report_type);
+int ishtp_hid_probe(unsigned int cur_hid_dev, struct ishtp_cl *hid_ishtp_cl);
+void ishtp_hid_remove(struct ishtp_cl *hid_ishtp_cl);
+
+#endif /* ISHTP_HID__H */
--
1.9.1