[linux-2.6-block.git] / drivers / uwb / scan.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Ultra Wide Band
 * Scanning management
 *
 * Copyright (C) 2005-2006 Intel Corporation
 * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
 *
 * FIXME: docs
 * FIXME: there are issues here on how BEACON and SCAN on USB RCI deal
 *        with each other. Currently seems that START_BEACON while
 *        SCAN_ONLY will cancel the scan, so we need to update the
 *        state here. Clarification request sent by email on
 *        10/05/2005.
 *        10/28/2005 No clear answer heard--maybe we'll hack the API
 *                   so that when we start beaconing, if the HC is
 *                   scanning in a mode not compatible with beaconing
 *                   we just fail.
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include "uwb-internal.h"


/**
 * Start/stop scanning in a radio controller
 *
 * @rc:      UWB Radio Controller
 * @channel: Channel to scan; encodings in WUSB1.0[Table 5.12]
 * @type:    Type of scanning to do.
 * @bpst_offset: value at which to start scanning (if type ==
 *                UWB_SCAN_ONLY_STARTTIME)
 * @returns: 0 if ok, < 0 errno code on error
 *
 * We put the command on kmalloc'ed memory as some arches cannot do
 * USB from the stack. The reply event is copied from an stage buffer,
 * so it can be in the stack. See WUSB1.0[8.6.2.4] for more details.
 */
int uwb_rc_scan(struct uwb_rc *rc,
		unsigned channel, enum uwb_scan_type type,
		unsigned bpst_offset)
{
	int result;
	struct uwb_rc_cmd_scan *cmd;
	struct uwb_rc_evt_confirm reply;

	result = -ENOMEM;
	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	if (cmd == NULL)
		goto error_kzalloc;
	mutex_lock(&rc->uwb_dev.mutex);
	cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
	cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SCAN);
	cmd->bChannelNumber = channel;
	cmd->bScanState = type;
	cmd->wStartTime = cpu_to_le16(bpst_offset);
	reply.rceb.bEventType = UWB_RC_CET_GENERAL;
	reply.rceb.wEvent = UWB_RC_CMD_SCAN;
	result = uwb_rc_cmd(rc, "SCAN", &cmd->rccb, sizeof(*cmd),
			    &reply.rceb, sizeof(reply));
	if (result < 0)
		goto error_cmd;
	if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
		dev_err(&rc->uwb_dev.dev,
			"SCAN: command execution failed: %s (%d)\n",
			uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
		result = -EIO;
		goto error_cmd;
	}
	rc->scanning = channel;
	rc->scan_type = type;
error_cmd:
	mutex_unlock(&rc->uwb_dev.mutex);
	kfree(cmd);
error_kzalloc:
	return result;
}

/*
 * Print scanning state
 */
static ssize_t uwb_rc_scan_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_rc *rc = uwb_dev->rc;
	ssize_t result;

	mutex_lock(&rc->uwb_dev.mutex);
	result = sprintf(buf, "%d %d\n", rc->scanning, rc->scan_type);
	mutex_unlock(&rc->uwb_dev.mutex);
	return result;
}

/*
 *
 */
static ssize_t uwb_rc_scan_store(struct device *dev,
				 struct device_attribute *attr,
				 const char *buf, size_t size)
{
	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	struct uwb_rc *rc = uwb_dev->rc;
	unsigned channel;
	unsigned type;
	unsigned bpst_offset = 0;
	ssize_t result = -EINVAL;

	result = sscanf(buf, "%u %u %u\n", &channel, &type, &bpst_offset);
	if (result >= 2 && type < UWB_SCAN_TOP)
		result = uwb_rc_scan(rc, channel, type, bpst_offset);

	return result < 0 ? result : size;
}

/** Radio Control sysfs interface (declaration) */
DEVICE_ATTR(scan, S_IRUGO | S_IWUSR, uwb_rc_scan_show, uwb_rc_scan_store);
Commit	Line	Data
04672fe6	1	// SPDX-License-Identifier: GPL-2.0-only
22d203ec IPG	2	/*
	3	* Ultra Wide Band
	4	* Scanning management
	5	*
	6	* Copyright (C) 2005-2006 Intel Corporation
	7	* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
	8	*
22d203ec IPG	9	* FIXME: docs
	10	* FIXME: there are issues here on how BEACON and SCAN on USB RCI deal
	11	* with each other. Currently seems that START_BEACON while
	12	* SCAN_ONLY will cancel the scan, so we need to update the
	13	* state here. Clarification request sent by email on
	14	* 10/05/2005.
	15	* 10/28/2005 No clear answer heard--maybe we'll hack the API
	16	* so that when we start beaconing, if the HC is
	17	* scanning in a mode not compatible with beaconing
	18	* we just fail.
	19	*/
	20
	21	#include <linux/device.h>
	22	#include <linux/err.h>
5a0e3ad6	23	#include <linux/slab.h>
0b992080	24	#include <linux/stat.h>
22d203ec IPG	25	#include "uwb-internal.h"
	26
	27
	28	/**
	29	* Start/stop scanning in a radio controller
	30	*
601e72a0	31	* @rc: UWB Radio Controller
22d203ec IPG	32	* @channel: Channel to scan; encodings in WUSB1.0[Table 5.12]
	33	* @type: Type of scanning to do.
	34	* @bpst_offset: value at which to start scanning (if type ==
	35	* UWB_SCAN_ONLY_STARTTIME)
	36	* @returns: 0 if ok, < 0 errno code on error
	37	*
	38	* We put the command on kmalloc'ed memory as some arches cannot do
	39	* USB from the stack. The reply event is copied from an stage buffer,
	40	* so it can be in the stack. See WUSB1.0[8.6.2.4] for more details.
	41	*/
	42	int uwb_rc_scan(struct uwb_rc *rc,
	43	unsigned channel, enum uwb_scan_type type,
	44	unsigned bpst_offset)
	45	{
	46	int result;
	47	struct uwb_rc_cmd_scan *cmd;
	48	struct uwb_rc_evt_confirm reply;
	49
	50	result = -ENOMEM;
	51	cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
	52	if (cmd == NULL)
	53	goto error_kzalloc;
	54	mutex_lock(&rc->uwb_dev.mutex);
	55	cmd->rccb.bCommandType = UWB_RC_CET_GENERAL;
	56	cmd->rccb.wCommand = cpu_to_le16(UWB_RC_CMD_SCAN);
	57	cmd->bChannelNumber = channel;
	58	cmd->bScanState = type;
	59	cmd->wStartTime = cpu_to_le16(bpst_offset);
	60	reply.rceb.bEventType = UWB_RC_CET_GENERAL;
	61	reply.rceb.wEvent = UWB_RC_CMD_SCAN;
	62	result = uwb_rc_cmd(rc, "SCAN", &cmd->rccb, sizeof(*cmd),
	63	&reply.rceb, sizeof(reply));
	64	if (result < 0)
	65	goto error_cmd;
	66	if (reply.bResultCode != UWB_RC_RES_SUCCESS) {
	67	dev_err(&rc->uwb_dev.dev,
	68	"SCAN: command execution failed: %s (%d)\n",
	69	uwb_rc_strerror(reply.bResultCode), reply.bResultCode);
	70	result = -EIO;
	71	goto error_cmd;
	72	}
	73	rc->scanning = channel;
	74	rc->scan_type = type;
	75	error_cmd:
	76	mutex_unlock(&rc->uwb_dev.mutex);
	77	kfree(cmd);
	78	error_kzalloc:
	79	return result;
	80	}
	81
	82	/*
	83	* Print scanning state
	84	*/
	85	static ssize_t uwb_rc_scan_show(struct device *dev,
	86	struct device_attribute attr, char buf)
	87	{
	88	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
	89	struct uwb_rc *rc = uwb_dev->rc;
	90	ssize_t result;
	91
	92	mutex_lock(&rc->uwb_dev.mutex);
	93	result = sprintf(buf, "%d %d\n", rc->scanning, rc->scan_type);
	94	mutex_unlock(&rc->uwb_dev.mutex);
	95	return result;
96	}
97
98	/*
99	*
100	*/
101	static ssize_t uwb_rc_scan_store(struct device *dev,
102	struct device_attribute *attr,
103	const char *buf, size_t size)
104	{
105	struct uwb_dev *uwb_dev = to_uwb_dev(dev);
106	struct uwb_rc *rc = uwb_dev->rc;
107	unsigned channel;
108	unsigned type;
109	unsigned bpst_offset = 0;
110	ssize_t result = -EINVAL;
111
112	result = sscanf(buf, "%u %u %u\n", &channel, &type, &bpst_offset);
113	if (result >= 2 && type < UWB_SCAN_TOP)
114	result = uwb_rc_scan(rc, channel, type, bpst_offset);
115
116	return result < 0 ? result : size;
117	}
118
119	/** Radio Control sysfs interface (declaration) */
120	DEVICE_ATTR(scan, S_IRUGO \| S_IWUSR, uwb_rc_scan_show, uwb_rc_scan_store);