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Release 4.11 drivers/hid/intel-ish-hid/ishtp-hid-client.c

/*
 * 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 <linux/sched.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(&client_data->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); }

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/** * 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; int curr_hid_dev = client_data->cur_hid_dev; if (data_len < sizeof(struct hostif_msg_hdr)) { dev_err(&client_data->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; } hid_ishtp_trace(client_data, "%s %d\n", __func__, recv_msg->hdr.command & CMD_MASK); 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; if (!client_data->hid_devices) client_data->hid_devices = devm_kzalloc( &client_data->cl_device->dev, client_data->hid_dev_count * sizeof(struct device_info), GFP_KERNEL); if (!client_data->hid_devices) { dev_err(&client_data->cl_device->dev, "Mem alloc failed for hid device info\n"); wake_up_interruptible(&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(&client_data->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 = true; wake_up_interruptible(&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; } if (!client_data->hid_descr[curr_hid_dev]) client_data->hid_descr[curr_hid_dev] = devm_kmalloc(&client_data->cl_device->dev, payload_len, GFP_KERNEL); if (client_data->hid_descr[curr_hid_dev]) { memcpy(client_data->hid_descr[curr_hid_dev], payload, payload_len); client_data->hid_descr_size[curr_hid_dev] = payload_len; client_data->hid_descr_done = true; } wake_up_interruptible(&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; } if (!client_data->report_descr[curr_hid_dev]) client_data->report_descr[curr_hid_dev] = devm_kmalloc(&client_data->cl_device->dev, payload_len, GFP_KERNEL); if (client_data->report_descr[curr_hid_dev]) { memcpy(client_data->report_descr[curr_hid_dev], payload, payload_len); client_data->report_descr_size[curr_hid_dev] = payload_len; client_data->report_descr_done = true; } wake_up_interruptible(&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); ishtp_hid_wakeup( client_data->hid_sensor_hubs[ i]); break; } } break; case HOSTIF_SET_FEATURE_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]) { ishtp_hid_wakeup( client_data->hid_sensor_hubs[ i]); break; } } 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); }

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/** * 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_cl_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); }

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/** * 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_hid_data *hid_data = hid->driver_data; struct ishtp_cl_data *client_data = hid_data->client_data; struct hostif_msg *msg = (struct hostif_msg *)buf; int rv; int i; hid_ishtp_trace(client_data, "%s hid %p\n", __func__, hid); rv = ishtp_hid_link_ready_wait(client_data); if (rv) { hid_ishtp_trace(client_data, "%s hid %p link not ready\n", __func__, hid); return; } 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(client_data->hid_ishtp_cl, buf, len); if (rv) hid_ishtp_trace(client_data, "%s hid %p send failed\n", __func__, hid); }

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/** * 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_hid_data *hid_data = hid->driver_data; struct ishtp_cl_data *client_data = hid_data->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; hid_ishtp_trace(client_data, "%s hid %p\n", __func__, hid); rv = ishtp_hid_link_ready_wait(client_data); if (rv) { hid_ishtp_trace(client_data, "%s hid %p link not ready\n", __func__, hid); return; } 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(client_data->hid_ishtp_cl, buf, len); if (rv) hid_ishtp_trace(client_data, "%s hid %p send failed\n", __func__, hid); }

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/** * ishtp_hid_link_ready_wait() - Wait for link ready * @client_data: client data instance * * If the transport link started suspend process, then wait, till either * resumed or timeout * * Return: 0 on success, non zero on error */
int ishtp_hid_link_ready_wait(struct ishtp_cl_data *client_data) { int rc; if (client_data->suspended) { hid_ishtp_trace(client_data, "wait for link ready\n"); rc = wait_event_interruptible_timeout( client_data->ishtp_resume_wait, !client_data->suspended, 5 * HZ); if (rc == 0) { hid_ishtp_trace(client_data, "link not ready\n"); return -EIO; } hid_ishtp_trace(client_data, "link ready\n"); } return 0; }

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/** * ishtp_enum_enum_devices() - Enumerate hid devices * @hid_ishtp_cl: client instance * * Helper function to send request to firmware to enumerate HID devices * * Return: 0 on success, non zero on error */
static int ishtp_enum_enum_devices(struct ishtp_cl *hid_ishtp_cl) { struct hostif_msg msg; struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data; int retry_count; int rv; /* Send HOSTIF_DM_ENUM_DEVICES */ memset(&msg, 0, sizeof(struct hostif_msg)); msg.hdr.command = HOSTIF_DM_ENUM_DEVICES; rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *)&msg, sizeof(struct hostif_msg)); if (rv) return rv; retry_count = 0; while (!client_data->enum_devices_done && retry_count < 10) { wait_event_interruptible_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, (unsigned char *) &msg, sizeof(struct hostif_msg)); } if (!client_data->enum_devices_done) { dev_err(&client_data->cl_device->dev, "[hid-ish]: timed out waiting for enum_devices\n"); return -ETIMEDOUT; } if (!client_data->hid_devices) { dev_err(&client_data->cl_device->dev, "[hid-ish]: failed to allocate HID dev structures\n"); return -ENOMEM; } client_data->num_hid_devices = client_data->hid_dev_count; dev_info(&hid_ishtp_cl->device->dev, "[hid-ish]: enum_devices_done OK, num_hid_devices=%d\n", client_data->num_hid_devices); return 0; }

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/** * ishtp_get_hid_descriptor() - Get hid descriptor * @hid_ishtp_cl: client instance * @index: Index into the hid_descr array * * Helper function to send request to firmware get HID descriptor of a device * * Return: 0 on success, non zero on error */
static int ishtp_get_hid_descriptor(struct ishtp_cl *hid_ishtp_cl, int index) { struct hostif_msg msg; struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data; int rv; /* Get HID descriptor */ client_data->hid_descr_done = false; memset(&msg, 0, sizeof(struct hostif_msg)); msg.hdr.command = HOSTIF_GET_HID_DESCRIPTOR; msg.hdr.device_id = client_data->hid_devices[index].dev_id; rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *) &msg, sizeof(struct hostif_msg)); if (rv) return rv; if (!client_data->hid_descr_done) { wait_event_interruptible_timeout(client_data->init_wait, client_data->hid_descr_done, 3 * HZ); if (!client_data->hid_descr_done) { dev_err(&client_data->cl_device->dev, "[hid-ish]: timed out for hid_descr_done\n"); return -EIO; } if (!client_data->hid_descr[index]) { dev_err(&client_data->cl_device->dev, "[hid-ish]: allocation HID desc fail\n"); return -ENOMEM; } } return 0; }

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/** * ishtp_get_report_descriptor() - Get report descriptor * @hid_ishtp_cl: client instance * @index: Index into the hid_descr array * * Helper function to send request to firmware get HID report descriptor of * a device * * Return: 0 on success, non zero on error */
static int ishtp_get_report_descriptor(struct ishtp_cl *hid_ishtp_cl, int index) { struct hostif_msg msg; struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data; int rv; /* Get report descriptor */ client_data->report_descr_done = false; memset(&msg, 0, sizeof(struct hostif_msg)); msg.hdr.command = HOSTIF_GET_REPORT_DESCRIPTOR; msg.hdr.device_id = client_data->hid_devices[index].dev_id; rv = ishtp_cl_send(hid_ishtp_cl, (unsigned char *) &msg, sizeof(struct hostif_msg)); if (rv) return rv; if (!client_data->report_descr_done) wait_event_interruptible_timeout(client_data->init_wait, client_data->report_descr_done, 3 * HZ); if (!client_data->report_descr_done) { dev_err(&client_data->cl_device->dev, "[hid-ish]: timed out for report descr\n"); return -EIO; } if (!client_data->report_descr[index]) { dev_err(&client_data->cl_device->dev, "[hid-ish]: failed to alloc report descr\n"); return -ENOMEM; } return 0; }

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/** * hid_ishtp_cl_init() - Init function for ISHTP client * @hid_ishtp_cl: ISHTP client instance * @reset: true if called for init after reset * * 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 * * Return: 0 on success, non zero on error */
static int hid_ishtp_cl_init(struct ishtp_cl *hid_ishtp_cl, int reset) { struct ishtp_device *dev; unsigned long flags; struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data; int i; int rv; dev_dbg(&client_data->cl_device->dev, "%s\n", __func__); hid_ishtp_trace(client_data, "%s reset flag: %d\n", __func__, reset); rv = ishtp_cl_link(hid_ishtp_cl, ISHTP_HOST_CLIENT_ID_ANY); if (rv) { dev_err(&client_data->cl_device->dev, "ishtp_cl_link failed\n"); 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); dev_err(&client_data->cl_device->dev, "ish client uuid not found\n"); 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) { dev_err(&client_data->cl_device->dev, "client connect fail\n"); goto err_cl_unlink; } hid_ishtp_trace(client_data, "%s client connected\n", __func__); /* Register read callback */ ishtp_register_event_cb(hid_ishtp_cl->device, ish_cl_event_cb); rv = ishtp_enum_enum_devices(hid_ishtp_cl); if (rv) goto err_cl_disconnect; hid_ishtp_trace(client_data, "%s enumerated device count %d\n", __func__, client_data->num_hid_devices); for (i = 0; i < client_data->num_hid_devices; ++i) { client_data->cur_hid_dev = i; rv = ishtp_get_hid_descriptor(hid_ishtp_cl, i); if (rv) goto err_cl_disconnect; rv = ishtp_get_report_descriptor(hid_ishtp_cl, i); if (rv) goto err_cl_disconnect; if (!reset) { rv = ishtp_hid_probe(i, client_data); if (rv) { dev_err(&client_data->cl_device->dev, "[hid-ish]: HID probe for #%u failed: %d\n", i, rv); goto err_cl_disconnect; } } } /* for() on all hid devices */ client_data->init_done = 1; client_data->suspended = false; wake_up_interruptible(&client_data->ishtp_resume_wait); hid_ishtp_trace(client_data, "%s successful init\n", __func__); return 0; err_cl_disconnect: hid_ishtp_cl->state = ISHTP_CL_DISCONNECTING; ishtp_cl_disconnect(hid_ishtp_cl); err_cl_unlink: ishtp_cl_unlink(hid_ishtp_cl); return rv; }

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/** * hid_ishtp_cl_deinit() - Deinit function for ISHTP client * @hid_ishtp_cl: ISHTP client instance * * Unlink and free hid client */
static void hid_ishtp_cl_deinit(struct ishtp_cl *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); }

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static void hid_ishtp_cl_reset_handler(struct work_struct *work) { struct ishtp_cl_data *client_data; struct ishtp_cl *hid_ishtp_cl; struct ishtp_cl_device *cl_device; int retry; int rv; client_data = container_of(work, struct ishtp_cl_data, work); hid_ishtp_cl = client_data->hid_ishtp_cl; cl_device = client_data->cl_device; hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__, hid_ishtp_cl); dev_dbg(&cl_device->dev, "%s\n", __func__); hid_ishtp_cl_deinit(hid_ishtp_cl); hid_ishtp_cl = ishtp_cl_allocate(cl_device->ishtp_dev); if (!hid_ishtp_cl) return; cl_device->driver_data = hid_ishtp_cl; hid_ishtp_cl->client_data = client_data; client_data->hid_ishtp_cl = hid_ishtp_cl; client_data->num_hid_devices = 0; for (retry = 0; retry < 3; ++retry) { rv = hid_ishtp_cl_init(hid_ishtp_cl, 1); if (!rv) break; dev_err(&client_data->cl_device->dev, "Retry reset init\n"); } if (rv) { dev_err(&client_data->cl_device->dev, "Reset Failed\n"); hid_ishtp_trace(client_data, "%s Failed hid_ishtp_cl %p\n", __func__, hid_ishtp_cl); } }

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/** * hid_ishtp_cl_probe() - ISHTP client driver probe * @cl_device: ISHTP client device instance * * This function gets called on device create on ISHTP bus * * Return: 0 on success, non zero on error */
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; client_data->hid_ishtp_cl = hid_ishtp_cl; client_data->cl_device = cl_device; init_waitqueue_head(&client_data->init_wait); init_waitqueue_head(&client_data->ishtp_resume_wait); INIT_WORK(&client_data->work, hid_ishtp_cl_reset_handler); rv = hid_ishtp_cl_init(hid_ishtp_cl, 0); if (rv) { ishtp_cl_free(hid_ishtp_cl); return rv; } ishtp_get_device(cl_device); return 0; }

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/** * hid_ishtp_cl_remove() - ISHTP client driver remove * @cl_device: ISHTP client device instance * * This function gets called on device remove on ISHTP bus * * Return: 0 */
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; hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__, hid_ishtp_cl); dev_dbg(&cl_device->dev, "%s\n", __func__); hid_ishtp_cl->state = ISHTP_CL_DISCONNECTING; ishtp_cl_disconnect(hid_ishtp_cl); ishtp_put_device(cl_device); ishtp_hid_remove(client_data); hid_ishtp_cl_deinit(hid_ishtp_cl); hid_ishtp_cl = NULL; client_data->num_hid_devices = 0; return 0; }

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/** * hid_ishtp_cl_reset() - ISHTP client driver reset * @cl_device: ISHTP client device instance * * This function gets called on device reset on ISHTP bus * * Return: 0 */
static int hid_ishtp_cl_reset(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; hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__, hid_ishtp_cl); schedule_work(&client_data->work); return 0; }

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#define to_ishtp_cl_device(d) container_of(d, struct ishtp_cl_device, dev) /** * hid_ishtp_cl_suspend() - ISHTP client driver suspend * @device: device instance * * This function gets called on system suspend * * Return: 0 */
static int hid_ishtp_cl_suspend(struct device *device) { struct ishtp_cl_device *cl_device = to_ishtp_cl_device(device); struct ishtp_cl *hid_ishtp_cl = cl_device->driver_data; struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data; hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__, hid_ishtp_cl); client_data->suspended = true; return 0; }

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/** * hid_ishtp_cl_resume() - ISHTP client driver resume * @device: device instance * * This function gets called on system resume * * Return: 0 */
static int hid_ishtp_cl_resume(struct device *device) { struct ishtp_cl_device *cl_device = to_ishtp_cl_device(device); struct ishtp_cl *hid_ishtp_cl = cl_device->driver_data; struct ishtp_cl_data *client_data = hid_ishtp_cl->client_data; hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__, hid_ishtp_cl); client_data->suspended = false; return 0; }

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static const struct dev_pm_ops hid_ishtp_pm_ops = { .suspend = hid_ishtp_cl_suspend, .resume = hid_ishtp_cl_resume, }; static struct ishtp_cl_driver hid_ishtp_cl_driver = { .name = "ish-hid", .probe = hid_ishtp_cl_probe, .remove = hid_ishtp_cl_remove, .reset = hid_ishtp_cl_reset, .driver.pm = &hid_ishtp_pm_ops, };
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; }

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static void __exit ish_hid_exit(void) { ishtp_cl_driver_unregister(&hid_ishtp_cl_driver); }

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late_initcall(ish_hid_init); module_exit(ish_hid_exit); MODULE_DESCRIPTION("ISH ISHTP HID client driver"); /* Primary author */ MODULE_AUTHOR("Daniel Drubin <daniel.drubin@intel.com>"); /* * Several modification for multi instance support * suspend/resume and clean up */ MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("ishtp:*");

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