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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
No need to support older kernel versions in the Greybus HID driver, so remove the checks as needed, we can now rely on all of the "new" apis being present. Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
536 lines
12 KiB
C
536 lines
12 KiB
C
/*
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* HID class driver for the Greybus.
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*
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* Copyright 2014 Google Inc.
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* Copyright 2014 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/bitops.h>
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#include <linux/hid.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include "greybus.h"
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/* Greybus HID device's structure */
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struct gb_hid {
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struct gb_bundle *bundle;
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struct gb_connection *connection;
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struct hid_device *hid;
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struct gb_hid_desc_response hdesc;
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unsigned long flags;
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#define GB_HID_STARTED 0x01
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#define GB_HID_READ_PENDING 0x04
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unsigned int bufsize;
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char *inbuf;
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};
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static DEFINE_MUTEX(gb_hid_open_mutex);
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/* Routines to get controller's information over greybus */
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/* Operations performed on greybus */
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static int gb_hid_get_desc(struct gb_hid *ghid)
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{
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return gb_operation_sync(ghid->connection, GB_HID_TYPE_GET_DESC, NULL,
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0, &ghid->hdesc, sizeof(ghid->hdesc));
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}
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static int gb_hid_get_report_desc(struct gb_hid *ghid, char *rdesc)
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{
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int ret;
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ret = gb_pm_runtime_get_sync(ghid->bundle);
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if (ret)
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return ret;
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ret = gb_operation_sync(ghid->connection, GB_HID_TYPE_GET_REPORT_DESC,
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NULL, 0, rdesc,
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le16_to_cpu(ghid->hdesc.wReportDescLength));
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gb_pm_runtime_put_autosuspend(ghid->bundle);
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return ret;
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}
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static int gb_hid_set_power(struct gb_hid *ghid, int type)
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{
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int ret;
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ret = gb_pm_runtime_get_sync(ghid->bundle);
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if (ret)
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return ret;
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ret = gb_operation_sync(ghid->connection, type, NULL, 0, NULL, 0);
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gb_pm_runtime_put_autosuspend(ghid->bundle);
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return ret;
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}
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static int gb_hid_get_report(struct gb_hid *ghid, u8 report_type, u8 report_id,
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unsigned char *buf, int len)
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{
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struct gb_hid_get_report_request request;
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int ret;
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ret = gb_pm_runtime_get_sync(ghid->bundle);
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if (ret)
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return ret;
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request.report_type = report_type;
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request.report_id = report_id;
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ret = gb_operation_sync(ghid->connection, GB_HID_TYPE_GET_REPORT,
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&request, sizeof(request), buf, len);
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gb_pm_runtime_put_autosuspend(ghid->bundle);
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return ret;
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}
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static int gb_hid_set_report(struct gb_hid *ghid, u8 report_type, u8 report_id,
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unsigned char *buf, int len)
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{
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struct gb_hid_set_report_request *request;
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struct gb_operation *operation;
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int ret, size = sizeof(*request) + len - 1;
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ret = gb_pm_runtime_get_sync(ghid->bundle);
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if (ret)
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return ret;
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operation = gb_operation_create(ghid->connection,
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GB_HID_TYPE_SET_REPORT, size, 0,
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GFP_KERNEL);
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if (!operation) {
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gb_pm_runtime_put_autosuspend(ghid->bundle);
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return -ENOMEM;
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}
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request = operation->request->payload;
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request->report_type = report_type;
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request->report_id = report_id;
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memcpy(request->report, buf, len);
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ret = gb_operation_request_send_sync(operation);
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if (ret) {
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dev_err(&operation->connection->bundle->dev,
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"failed to set report: %d\n", ret);
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} else {
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ret = len;
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}
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gb_operation_put(operation);
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gb_pm_runtime_put_autosuspend(ghid->bundle);
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return ret;
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}
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static int gb_hid_request_handler(struct gb_operation *op)
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{
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struct gb_connection *connection = op->connection;
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struct gb_hid *ghid = gb_connection_get_data(connection);
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struct gb_hid_input_report_request *request = op->request->payload;
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if (op->type != GB_HID_TYPE_IRQ_EVENT) {
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dev_err(&connection->bundle->dev,
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"unsupported unsolicited request\n");
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return -EINVAL;
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}
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if (test_bit(GB_HID_STARTED, &ghid->flags))
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hid_input_report(ghid->hid, HID_INPUT_REPORT,
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request->report, op->request->payload_size, 1);
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return 0;
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}
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static int gb_hid_report_len(struct hid_report *report)
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{
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return ((report->size - 1) >> 3) + 1 +
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report->device->report_enum[report->type].numbered;
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}
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static void gb_hid_find_max_report(struct hid_device *hid, unsigned int type,
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unsigned int *max)
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{
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struct hid_report *report;
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unsigned int size;
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list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
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size = gb_hid_report_len(report);
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if (*max < size)
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*max = size;
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}
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}
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static void gb_hid_free_buffers(struct gb_hid *ghid)
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{
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kfree(ghid->inbuf);
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ghid->inbuf = NULL;
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ghid->bufsize = 0;
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}
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static int gb_hid_alloc_buffers(struct gb_hid *ghid, size_t bufsize)
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{
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ghid->inbuf = kzalloc(bufsize, GFP_KERNEL);
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if (!ghid->inbuf)
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return -ENOMEM;
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ghid->bufsize = bufsize;
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return 0;
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}
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/* Routines dealing with reports */
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static void gb_hid_init_report(struct gb_hid *ghid, struct hid_report *report)
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{
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unsigned int size;
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size = gb_hid_report_len(report);
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if (gb_hid_get_report(ghid, report->type, report->id, ghid->inbuf,
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size))
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return;
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/*
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* hid->driver_lock is held as we are in probe function,
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* we just need to setup the input fields, so using
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* hid_report_raw_event is safe.
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*/
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hid_report_raw_event(ghid->hid, report->type, ghid->inbuf, size, 1);
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}
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static void gb_hid_init_reports(struct gb_hid *ghid)
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{
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struct hid_device *hid = ghid->hid;
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struct hid_report *report;
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list_for_each_entry(report,
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&hid->report_enum[HID_INPUT_REPORT].report_list, list)
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gb_hid_init_report(ghid, report);
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list_for_each_entry(report,
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&hid->report_enum[HID_FEATURE_REPORT].report_list, list)
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gb_hid_init_report(ghid, report);
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}
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static int __gb_hid_get_raw_report(struct hid_device *hid,
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unsigned char report_number, __u8 *buf, size_t count,
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unsigned char report_type)
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{
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struct gb_hid *ghid = hid->driver_data;
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int ret;
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if (report_type == HID_OUTPUT_REPORT)
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return -EINVAL;
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ret = gb_hid_get_report(ghid, report_type, report_number, buf, count);
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if (!ret)
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ret = count;
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return ret;
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}
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static int __gb_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
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size_t len, unsigned char report_type)
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{
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struct gb_hid *ghid = hid->driver_data;
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int report_id = buf[0];
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int ret;
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if (report_type == HID_INPUT_REPORT)
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return -EINVAL;
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if (report_id) {
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buf++;
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len--;
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}
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ret = gb_hid_set_report(ghid, report_type, report_id, buf, len);
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if (report_id && ret >= 0)
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ret++; /* add report_id to the number of transfered bytes */
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return 0;
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}
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static int gb_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
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__u8 *buf, size_t len, unsigned char rtype,
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int reqtype)
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{
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switch (reqtype) {
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case HID_REQ_GET_REPORT:
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return __gb_hid_get_raw_report(hid, reportnum, buf, len, rtype);
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case HID_REQ_SET_REPORT:
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if (buf[0] != reportnum)
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return -EINVAL;
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return __gb_hid_output_raw_report(hid, buf, len, rtype);
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default:
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return -EIO;
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}
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}
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/* HID Callbacks */
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static int gb_hid_parse(struct hid_device *hid)
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{
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struct gb_hid *ghid = hid->driver_data;
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unsigned int rsize;
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char *rdesc;
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int ret;
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rsize = le16_to_cpu(ghid->hdesc.wReportDescLength);
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if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
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dbg_hid("weird size of report descriptor (%u)\n", rsize);
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return -EINVAL;
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}
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rdesc = kzalloc(rsize, GFP_KERNEL);
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if (!rdesc) {
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dbg_hid("couldn't allocate rdesc memory\n");
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return -ENOMEM;
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}
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ret = gb_hid_get_report_desc(ghid, rdesc);
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if (ret) {
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hid_err(hid, "reading report descriptor failed\n");
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goto free_rdesc;
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}
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ret = hid_parse_report(hid, rdesc, rsize);
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if (ret)
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dbg_hid("parsing report descriptor failed\n");
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free_rdesc:
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kfree(rdesc);
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return ret;
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}
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static int gb_hid_start(struct hid_device *hid)
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{
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struct gb_hid *ghid = hid->driver_data;
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unsigned int bufsize = HID_MIN_BUFFER_SIZE;
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int ret;
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gb_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
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gb_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
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gb_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
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if (bufsize > HID_MAX_BUFFER_SIZE)
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bufsize = HID_MAX_BUFFER_SIZE;
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ret = gb_hid_alloc_buffers(ghid, bufsize);
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if (ret)
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return ret;
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if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
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gb_hid_init_reports(ghid);
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return 0;
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}
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static void gb_hid_stop(struct hid_device *hid)
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{
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struct gb_hid *ghid = hid->driver_data;
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gb_hid_free_buffers(ghid);
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}
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static int gb_hid_open(struct hid_device *hid)
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{
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struct gb_hid *ghid = hid->driver_data;
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int ret = 0;
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mutex_lock(&gb_hid_open_mutex);
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if (!hid->open++) {
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ret = gb_hid_set_power(ghid, GB_HID_TYPE_PWR_ON);
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if (ret < 0)
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hid->open--;
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else
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set_bit(GB_HID_STARTED, &ghid->flags);
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}
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mutex_unlock(&gb_hid_open_mutex);
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return ret;
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}
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static void gb_hid_close(struct hid_device *hid)
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{
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struct gb_hid *ghid = hid->driver_data;
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int ret;
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/*
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* Protecting hid->open to make sure we don't restart data acquistion
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* due to a resumption we no longer care about..
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*/
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mutex_lock(&gb_hid_open_mutex);
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if (!--hid->open) {
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clear_bit(GB_HID_STARTED, &ghid->flags);
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/* Save some power */
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ret = gb_hid_set_power(ghid, GB_HID_TYPE_PWR_OFF);
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if (ret)
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dev_err(&ghid->connection->bundle->dev,
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"failed to power off (%d)\n", ret);
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}
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mutex_unlock(&gb_hid_open_mutex);
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}
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static int gb_hid_power(struct hid_device *hid, int lvl)
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{
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struct gb_hid *ghid = hid->driver_data;
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switch (lvl) {
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case PM_HINT_FULLON:
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return gb_hid_set_power(ghid, GB_HID_TYPE_PWR_ON);
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case PM_HINT_NORMAL:
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return gb_hid_set_power(ghid, GB_HID_TYPE_PWR_OFF);
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}
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return 0;
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}
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/* HID structure to pass callbacks */
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static struct hid_ll_driver gb_hid_ll_driver = {
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.parse = gb_hid_parse,
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.start = gb_hid_start,
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.stop = gb_hid_stop,
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.open = gb_hid_open,
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.close = gb_hid_close,
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.power = gb_hid_power,
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.raw_request = gb_hid_raw_request,
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};
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static int gb_hid_init(struct gb_hid *ghid)
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{
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struct hid_device *hid = ghid->hid;
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int ret;
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ret = gb_hid_get_desc(ghid);
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if (ret)
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return ret;
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hid->version = le16_to_cpu(ghid->hdesc.bcdHID);
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hid->vendor = le16_to_cpu(ghid->hdesc.wVendorID);
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hid->product = le16_to_cpu(ghid->hdesc.wProductID);
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hid->country = ghid->hdesc.bCountryCode;
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hid->driver_data = ghid;
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hid->ll_driver = &gb_hid_ll_driver;
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hid->dev.parent = &ghid->connection->bundle->dev;
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// hid->bus = BUS_GREYBUS; /* Need a bustype for GREYBUS in <linux/input.h> */
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/* Set HID device's name */
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snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
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dev_name(&ghid->connection->bundle->dev),
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hid->vendor, hid->product);
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return 0;
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}
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static int gb_hid_probe(struct gb_bundle *bundle,
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const struct greybus_bundle_id *id)
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{
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struct greybus_descriptor_cport *cport_desc;
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struct gb_connection *connection;
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struct hid_device *hid;
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struct gb_hid *ghid;
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int ret;
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if (bundle->num_cports != 1)
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return -ENODEV;
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cport_desc = &bundle->cport_desc[0];
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if (cport_desc->protocol_id != GREYBUS_PROTOCOL_HID)
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return -ENODEV;
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ghid = kzalloc(sizeof(*ghid), GFP_KERNEL);
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if (!ghid)
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return -ENOMEM;
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connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
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gb_hid_request_handler);
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if (IS_ERR(connection)) {
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ret = PTR_ERR(connection);
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goto err_free_ghid;
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}
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gb_connection_set_data(connection, ghid);
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ghid->connection = connection;
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hid = hid_allocate_device();
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if (IS_ERR(hid)) {
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ret = PTR_ERR(hid);
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goto err_connection_destroy;
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}
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ghid->hid = hid;
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ghid->bundle = bundle;
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greybus_set_drvdata(bundle, ghid);
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ret = gb_connection_enable(connection);
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if (ret)
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goto err_destroy_hid;
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ret = gb_hid_init(ghid);
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if (ret)
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goto err_connection_disable;
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ret = hid_add_device(hid);
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if (ret) {
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hid_err(hid, "can't add hid device: %d\n", ret);
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goto err_connection_disable;
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}
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gb_pm_runtime_put_autosuspend(bundle);
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return 0;
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err_connection_disable:
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gb_connection_disable(connection);
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err_destroy_hid:
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hid_destroy_device(hid);
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err_connection_destroy:
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gb_connection_destroy(connection);
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err_free_ghid:
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kfree(ghid);
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return ret;
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}
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static void gb_hid_disconnect(struct gb_bundle *bundle)
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{
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struct gb_hid *ghid = greybus_get_drvdata(bundle);
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if (gb_pm_runtime_get_sync(bundle))
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gb_pm_runtime_get_noresume(bundle);
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hid_destroy_device(ghid->hid);
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gb_connection_disable(ghid->connection);
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gb_connection_destroy(ghid->connection);
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kfree(ghid);
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}
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static const struct greybus_bundle_id gb_hid_id_table[] = {
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_HID) },
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{ }
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};
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MODULE_DEVICE_TABLE(greybus, gb_hid_id_table);
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static struct greybus_driver gb_hid_driver = {
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.name = "hid",
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.probe = gb_hid_probe,
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.disconnect = gb_hid_disconnect,
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.id_table = gb_hid_id_table,
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};
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module_greybus_driver(gb_hid_driver);
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MODULE_LICENSE("GPL v2");
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