// SPDX-License-Identifier: GPL-2.0-only
/*
* ISHTP client driver for HID (ISH)
*
* Copyright (c) 2014-2016, Intel Corporation.
*/
#include <linux/module.h>
#include <linux/hid.h>
#include <linux/intel-ish-client-if.h>
#include <linux/sched.h>
#include "ishtp-hid.h"
/* Rx ring buffer pool size */
#define HID_CL_RX_RING_SIZE 32
#define HID_CL_TX_RING_SIZE 16
#define cl_data_to_dev(client_data) ishtp_device(client_data->cl_device)
/**
* 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 = ishtp_get_client_data(hid_ishtp_cl);
dev_err(cl_data_to_dev(client_data), "[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, raw_len;
int report_type;
struct report_list *reports_list;
char *reports;
size_t report_len;
struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
int curr_hid_dev = client_data->cur_hid_dev;
struct ishtp_hid_data *hid_data = NULL;
struct hid_device *hid = NULL;
payload = recv_buf + sizeof(struct hostif_msg_hdr);
total_len = data_len;
cur_pos = 0;
do {
if (cur_pos + sizeof(struct hostif_msg) > total_len) {
dev_err(cl_data_to_dev(client_data),
"[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(ishtp_get_ishtp_device(hid_ishtp_cl));
break;
}
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(ishtp_get_ishtp_device(hid_ishtp_cl));
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(ishtp_get_ishtp_device(hid_ishtp_cl));
break;
}
client_data->hid_dev_count = (unsigned int)*payload;
if (!client_data->hid_devices)
client_data->hid_devices = devm_kcalloc(
cl_data_to_dev(client_data),
client_data->hid_dev_count,
sizeof(struct device_info),
GFP_KERNEL);
if (!client_data->hid_devices) {
dev_err(cl_data_to_dev(client_data),
"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(cl_data_to_dev(client_data),
"[hid-ish]: [ENUM_DEVICES]: content size %zu is bigger than payload_len %zu\n",
1 + sizeof(struct device_info)
* i, 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(ishtp_get_ishtp_device(hid_ishtp_cl));
break;
}
if (!client_data->hid_descr[curr_hid_dev])
client_data->hid_descr[curr_hid_dev] =
devm_kmalloc(cl_data_to_dev(client_data),
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(ishtp_get_ishtp_device(hid_ishtp_cl));
break;
}
if (!client_data->report_descr[curr_hid_dev])
client_data->report_descr[curr_hid_dev] =
devm_kmalloc(cl_data_to_dev(client_data),
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) {
hid = client_data->hid_sensor_hubs[i];
if (!hid)
break;
hid_data = hid->driver_data;
if (hid_data->raw_get_req) {
raw_len =
(hid_data->raw_buf_size <
payload_len) ?
hid_data->raw_buf_size :
payload_len;
memcpy(hid_data->raw_buf,
payload, raw_len);
} else {
hid_input_report
(hid, report_type,
payload, payload_len,
0);
}
ishtp_hid_wakeup(hid);
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(ishtp_get_ishtp_device(hid_ishtp_cl));
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 = ishtp_get_drvdata(device);
struct ishtp_cl_rb *rb_in_proc;
size_t r_length;
if (!hid_ishtp_cl)
return;
while ((rb_in_proc = ishtp_cl_rx_get_rb(hid_ishtp_cl)) != NULL) {
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);
}
}
/**
* 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;
struct hostif_msg_to_sensor msg = {};
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;
}
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, (uint8_t *)&msg,
sizeof(msg));
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 = ishtp_get_client_data(hid_ishtp_cl);
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(cl_data_to_dev(client_data),
"[hid-ish]: timed out waiting for enum_devices\n");
return -ETIMEDOUT;
}
if (!client_data->hid_devices) {
dev_err(cl_data_to_dev(client_data),
"[hid-ish]: failed to allocate HID dev structures\n");
return -ENOMEM;
}
client_data->num_hid_devices = client_data->hid_dev_count;
dev_info(ishtp_device(client_data->cl_device),
"[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 = ishtp_get_client_data(hid_ishtp_cl);
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(cl_data_to_dev(client_data),
"[hid-ish]: timed out for hid_descr_done\n");
return -EIO;
}
if (!client_data->hid_descr[index]) {
dev_err(cl_data_to_dev(client_data),
"[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 = ishtp_get_client_data(hid_ishtp_cl);
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(cl_data_to_dev(client_data),
"[hid-ish]: timed out for report descr\n");
return -EIO;
}
if (!client_data->report_descr[index]) {
dev_err(cl_data_to_dev(client_data),
"[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;
struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
struct ishtp_fw_client *fw_client;
int i;
int rv;
dev_dbg(cl_data_to_dev(client_data), "%s\n", __func__);
hid_ishtp_trace(client_data, "%s reset flag: %d\n", __func__, reset);
rv = ishtp_cl_link(hid_ishtp_cl);
if (rv) {
dev_err(cl_data_to_dev(client_data),
"ishtp_cl_link failed\n");
return -ENOMEM;
}
client_data->init_done = 0;
dev = ishtp_get_ishtp_device(hid_ishtp_cl);
/* Connect to FW client */
ishtp_set_tx_ring_size(hid_ishtp_cl, HID_CL_TX_RING_SIZE);
ishtp_set_rx_ring_size(hid_ishtp_cl, HID_CL_RX_RING_SIZE);
fw_client = ishtp_fw_cl_get_client(dev, &hid_ishtp_guid);
if (!fw_client) {
dev_err(cl_data_to_dev(client_data),
"ish client uuid not found\n");
return -ENOENT;
}
ishtp_cl_set_fw_client_id(hid_ishtp_cl,
ishtp_get_fw_client_id(fw_client));
ishtp_set_connection_state(hid_ishtp_cl, ISHTP_CL_CONNECTING);
rv = ishtp_cl_connect(hid_ishtp_cl);
if (rv) {
dev_err(cl_data_to_dev(client_data),
"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(client_data->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(cl_data_to_dev(client_data),
"[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:
ishtp_set_connection_state(hid_ishtp_cl, 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(ishtp_device(client_data->cl_device), "%s\n", __func__);
hid_ishtp_cl_deinit(hid_ishtp_cl);
hid_ishtp_cl = ishtp_cl_allocate(cl_device);
if (!hid_ishtp_cl)
return;
ishtp_set_drvdata(cl_device, hid_ishtp_cl);
ishtp_set_client_data(hid_ishtp_cl, 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(cl_data_to_dev(client_data), "Retry reset init\n");
}
if (rv) {
dev_err(cl_data_to_dev(client_data), "Reset Failed\n");
hid_ishtp_trace(client_data, "%s Failed hid_ishtp_cl %p\n",
__func__, hid_ishtp_cl);
}
}
void (*hid_print_trace)(void *unused, const char *format, ...);
/**
* 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;
client_data = devm_kzalloc(ishtp_device(cl_device),
sizeof(*client_data),
GFP_KERNEL);
if (!client_data)
return -ENOMEM;
hid_ishtp_cl = ishtp_cl_allocate(cl_device);
if (!hid_ishtp_cl)
return -ENOMEM;
ishtp_set_drvdata(cl_device, hid_ishtp_cl);
ishtp_set_client_data(hid_ishtp_cl, 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);
hid_print_trace = ishtp_trace_callback(cl_device);
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 = ishtp_get_drvdata(cl_device);
struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
hid_ishtp_cl);
dev_dbg(ishtp_device(cl_device), "%s\n", __func__);
ishtp_set_connection_state(hid_ishtp_cl, 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 = ishtp_get_drvdata(cl_device);
struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
hid_ishtp_trace(client_data, "%s hid_ishtp_cl %p\n", __func__,
hid_ishtp_cl);
schedule_work(&client_data->work);
return 0;
}
/**
* 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 = ishtp_dev_to_cl_device(device);
struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
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 = ishtp_dev_to_cl_device(device);
struct ishtp_cl *hid_ishtp_cl = ishtp_get_drvdata(cl_device);
struct ishtp_cl_data *client_data = ishtp_get_client_data(hid_ishtp_cl);
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",
.guid = &hid_ishtp_guid,
.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, THIS_MODULE);
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:*");