diff options
Diffstat (limited to 'drivers/hid/intel-ish-hid/ishtp-hid-client.c')
| -rw-r--r-- | drivers/hid/intel-ish-hid/ishtp-hid-client.c | 978 |
1 files changed, 978 insertions, 0 deletions
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 000000000000..5c643d7a07b2 --- /dev/null +++ b/drivers/hid/intel-ish-hid/ishtp-hid-client.c @@ -0,0 +1,978 @@ +/* + * 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); +} + +/** + * 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); +} + +/** + * 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); +} + +/** + * 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); +} + +/** + * 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); +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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); +} + +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); + } +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + +#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; +} + +/** + * 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; +} + +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; + +} + +static void __exit ish_hid_exit(void) +{ + ishtp_cl_driver_unregister(&hid_ishtp_cl_driver); +} + +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:*"); |