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|
/*
* HID class driver for the Greybus.
*
* Copyright 2014 Google Inc.
* Copyright 2014 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include <linux/bitops.h>
#include <linux/hid.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include "greybus.h"
/* Greybus HID device's structure */
struct gb_hid {
struct gb_connection *connection;
struct hid_device *hid;
struct gb_hid_desc_response hdesc;
unsigned long flags;
#define GB_HID_STARTED 0x01
#define GB_HID_READ_PENDING 0x04
unsigned int bufsize;
char *inbuf;
};
static DEFINE_MUTEX(gb_hid_open_mutex);
/* Routines to get controller's information over greybus */
/* Operations performed on greybus */
static int gb_hid_get_desc(struct gb_hid *ghid)
{
return gb_operation_sync(ghid->connection, GB_HID_TYPE_GET_DESC, NULL,
0, &ghid->hdesc, sizeof(ghid->hdesc));
}
static int gb_hid_get_report_desc(struct gb_hid *ghid, char *rdesc)
{
return gb_operation_sync(ghid->connection, GB_HID_TYPE_GET_REPORT_DESC,
NULL, 0, rdesc,
le16_to_cpu(ghid->hdesc.wReportDescLength));
}
static int gb_hid_set_power(struct gb_hid *ghid, int type)
{
return gb_operation_sync(ghid->connection, type, NULL, 0, NULL, 0);
}
static int gb_hid_get_report(struct gb_hid *ghid, u8 report_type, u8 report_id,
unsigned char *buf, int len)
{
struct gb_hid_get_report_request request;
request.report_type = report_type;
request.report_id = report_id;
return gb_operation_sync(ghid->connection, GB_HID_TYPE_GET_REPORT,
&request, sizeof(request), buf, len);
}
static int gb_hid_set_report(struct gb_hid *ghid, u8 report_type, u8 report_id,
unsigned char *buf, int len)
{
struct gb_hid_set_report_request *request;
struct gb_operation *operation;
int ret, size = sizeof(*request) + len - 1;
operation = gb_operation_create(ghid->connection,
GB_HID_TYPE_SET_REPORT, size, 0,
GFP_KERNEL);
if (!operation)
return -ENOMEM;
request = operation->request->payload;
request->report_type = report_type;
request->report_id = report_id;
memcpy(request->report, buf, len);
ret = gb_operation_request_send_sync(operation);
if (ret) {
dev_err(&operation->connection->bundle->dev,
"failed to set report: %d\n", ret);
} else {
ret = len;
}
gb_operation_put(operation);
return ret;
}
static int gb_hid_request_handler(struct gb_operation *op)
{
struct gb_connection *connection = op->connection;
struct gb_hid *ghid = connection->private;
struct gb_hid_input_report_request *request = op->request->payload;
if (op->type != GB_HID_TYPE_IRQ_EVENT) {
dev_err(&connection->bundle->dev,
"unsupported unsolicited request\n");
return -EINVAL;
}
if (test_bit(GB_HID_STARTED, &ghid->flags))
hid_input_report(ghid->hid, HID_INPUT_REPORT,
request->report, op->request->payload_size, 1);
return 0;
}
static int gb_hid_report_len(struct hid_report *report)
{
return ((report->size - 1) >> 3) + 1 +
report->device->report_enum[report->type].numbered;
}
static void gb_hid_find_max_report(struct hid_device *hid, unsigned int type,
unsigned int *max)
{
struct hid_report *report;
unsigned int size;
list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
size = gb_hid_report_len(report);
if (*max < size)
*max = size;
}
}
static void gb_hid_free_buffers(struct gb_hid *ghid)
{
kfree(ghid->inbuf);
ghid->inbuf = NULL;
ghid->bufsize = 0;
}
static int gb_hid_alloc_buffers(struct gb_hid *ghid, size_t bufsize)
{
ghid->inbuf = kzalloc(bufsize, GFP_KERNEL);
if (!ghid->inbuf)
return -ENOMEM;
ghid->bufsize = bufsize;
return 0;
}
/* Routines dealing with reports */
static void gb_hid_init_report(struct gb_hid *ghid, struct hid_report *report)
{
unsigned int size;
size = gb_hid_report_len(report);
if (gb_hid_get_report(ghid, report->type, report->id, ghid->inbuf,
size))
return;
/*
* hid->driver_lock is held as we are in probe function,
* we just need to setup the input fields, so using
* hid_report_raw_event is safe.
*/
hid_report_raw_event(ghid->hid, report->type, ghid->inbuf, size, 1);
}
static void gb_hid_init_reports(struct gb_hid *ghid)
{
struct hid_device *hid = ghid->hid;
struct hid_report *report;
list_for_each_entry(report,
&hid->report_enum[HID_INPUT_REPORT].report_list, list)
gb_hid_init_report(ghid, report);
list_for_each_entry(report,
&hid->report_enum[HID_FEATURE_REPORT].report_list, list)
gb_hid_init_report(ghid, report);
}
static int __gb_hid_get_raw_report(struct hid_device *hid,
unsigned char report_number, __u8 *buf, size_t count,
unsigned char report_type)
{
struct gb_hid *ghid = hid->driver_data;
int ret;
if (report_type == HID_OUTPUT_REPORT)
return -EINVAL;
ret = gb_hid_get_report(ghid, report_type, report_number, buf, count);
if (!ret)
ret = count;
return ret;
}
static int __gb_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
size_t len, unsigned char report_type)
{
struct gb_hid *ghid = hid->driver_data;
int report_id = buf[0];
int ret;
if (report_type == HID_INPUT_REPORT)
return -EINVAL;
if (report_id) {
buf++;
len--;
}
ret = gb_hid_set_report(ghid, report_type, report_id, buf, len);
if (report_id && ret >= 0)
ret++; /* add report_id to the number of transfered bytes */
return 0;
}
static int gb_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
__u8 *buf, size_t len, unsigned char rtype,
int reqtype)
{
switch (reqtype) {
case HID_REQ_GET_REPORT:
return __gb_hid_get_raw_report(hid, reportnum, buf, len, rtype);
case
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