udsbr.c revision 1.23 
1/*	$NetBSD: udsbr.c,v 1.23 2016/04/23 10:15:32 skrll Exp $	*/
2
3/*
4 * Copyright (c) 2002 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Lennart Augustsson (lennart@augustsson.net).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Driver for the D-Link DSB-R100 FM radio.
34 * I apologize for the magic hex constants, but this is what happens
35 * when you have to reverse engineer the driver.
36 * Parts of the code borrowed from Linux and parts from Warner Losh's
37 * FreeBSD driver.
38 */
39
40#include <sys/cdefs.h>
41__KERNEL_RCSID(0, "$NetBSD: udsbr.c,v 1.23 2016/04/23 10:15:32 skrll Exp $");
42
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/kernel.h>
46#include <sys/device.h>
47
48#include <sys/radioio.h>
49#include <dev/radio_if.h>
50
51#include <dev/usb/usb.h>
52#include <dev/usb/usbdi.h>
53#include <dev/usb/usbdi_util.h>
54#include <dev/usb/usbdivar.h>
55
56#include <dev/usb/usbdevs.h>
57
58#ifdef UDSBR_DEBUG
59#define DPRINTF(x)	if (udsbrdebug) printf x
60#define DPRINTFN(n,x)	if (udsbrdebug>(n)) printf x
61int	udsbrdebug = 0;
62#else
63#define DPRINTF(x)
64#define DPRINTFN(n,x)
65#endif
66
67#define UDSBR_CONFIG_NO		1
68
69Static	int     udsbr_get_info(void *, struct radio_info *);
70Static	int     udsbr_set_info(void *, struct radio_info *);
71
72const struct radio_hw_if udsbr_hw_if = {
73	NULL, /* open */
74	NULL, /* close */
75	udsbr_get_info,
76	udsbr_set_info,
77	NULL
78};
79
80struct udsbr_softc {
81 	device_t		sc_dev;
82	struct usbd_device *	sc_udev;
83
84	char			sc_mute;
85	char			sc_vol;
86	uint32_t		sc_freq;
87
88	device_t		sc_child;
89
90	char			sc_dying;
91};
92
93Static	int	udsbr_req(struct udsbr_softc *, int, int,
94			  int);
95Static	void	udsbr_start(struct udsbr_softc *);
96Static	void	udsbr_stop(struct udsbr_softc *);
97Static	void	udsbr_setfreq(struct udsbr_softc *, int);
98Static	int	udsbr_status(struct udsbr_softc *);
99
100int udsbr_match(device_t, cfdata_t, void *);
101void udsbr_attach(device_t, device_t, void *);
102void udsbr_childdet(device_t, device_t);
103int udsbr_detach(device_t, int);
104int udsbr_activate(device_t, enum devact);
105extern struct cfdriver udsbr_cd;
106CFATTACH_DECL2_NEW(udsbr, sizeof(struct udsbr_softc), udsbr_match,
107    udsbr_attach, udsbr_detach, udsbr_activate, NULL, udsbr_childdet);
108
109int
110udsbr_match(device_t parent, cfdata_t match, void *aux)
111{
112	struct usb_attach_arg *uaa = aux;
113
114	DPRINTFN(50,("udsbr_match\n"));
115
116	if (uaa->uaa_vendor != USB_VENDOR_CYPRESS ||
117	    uaa->uaa_product != USB_PRODUCT_CYPRESS_FMRADIO)
118		return UMATCH_NONE;
119	return UMATCH_VENDOR_PRODUCT;
120}
121
122void
123udsbr_attach(device_t parent, device_t self, void *aux)
124{
125	struct udsbr_softc *sc = device_private(self);
126	struct usb_attach_arg *uaa = aux;
127	struct usbd_device *	dev = uaa->uaa_device;
128	char			*devinfop;
129	usbd_status		err;
130
131	DPRINTFN(10,("udsbr_attach: sc=%p\n", sc));
132
133	sc->sc_dev = self;
134
135	aprint_naive("\n");
136	aprint_normal("\n");
137
138	devinfop = usbd_devinfo_alloc(dev, 0);
139	aprint_normal_dev(self, "%s\n", devinfop);
140	usbd_devinfo_free(devinfop);
141
142	err = usbd_set_config_no(dev, UDSBR_CONFIG_NO, 1);
143	if (err) {
144		aprint_error_dev(self, "failed to set configuration"
145		    ", err=%s\n", usbd_errstr(err));
146		return;
147	}
148
149	sc->sc_udev = dev;
150
151	DPRINTFN(10, ("udsbr_attach: %p\n", sc->sc_udev));
152
153	usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->sc_udev,
154			   sc->sc_dev);
155
156	sc->sc_child = radio_attach_mi(&udsbr_hw_if, sc, sc->sc_dev);
157
158	return;
159}
160
161void
162udsbr_childdet(device_t self, device_t child)
163{
164}
165
166int
167udsbr_detach(device_t self, int flags)
168{
169	struct udsbr_softc *sc = device_private(self);
170	int rv = 0;
171
172	if (sc->sc_child != NULL)
173		rv = config_detach(sc->sc_child, flags);
174
175	usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
176			   sc->sc_dev);
177
178	return rv;
179}
180
181int
182udsbr_activate(device_t self, enum devact act)
183{
184	struct udsbr_softc *sc = device_private(self);
185
186	switch (act) {
187	case DVACT_DEACTIVATE:
188		sc->sc_dying = 1;
189		return 0;
190	default:
191		return EOPNOTSUPP;
192	}
193}
194
195int
196udsbr_req(struct udsbr_softc *sc, int ureq, int value, int index)
197{
198	usb_device_request_t req;
199	usbd_status err;
200	u_char data;
201
202	DPRINTFN(1,("udsbr_req: ureq=0x%02x value=0x%04x index=0x%04x\n",
203		    ureq, value, index));
204	req.bmRequestType = UT_READ_VENDOR_DEVICE;
205	req.bRequest = ureq;
206	USETW(req.wValue, value);
207	USETW(req.wIndex, index);
208	USETW(req.wLength, 1);
209	err = usbd_do_request(sc->sc_udev, &req, &data);
210	if (err) {
211		aprint_error_dev(sc->sc_dev, "request failed err=%d\n", err);
212	}
213	return !(data & 1);
214}
215
216void
217udsbr_start(struct udsbr_softc *sc)
218{
219	(void)udsbr_req(sc, 0x00, 0x0000, 0x00c7);
220	(void)udsbr_req(sc, 0x02, 0x0001, 0x0000);
221}
222
223void
224udsbr_stop(struct udsbr_softc *sc)
225{
226	(void)udsbr_req(sc, 0x00, 0x0016, 0x001c);
227	(void)udsbr_req(sc, 0x02, 0x0000, 0x0000);
228}
229
230void
231udsbr_setfreq(struct udsbr_softc *sc, int freq)
232{
233	DPRINTF(("udsbr_setfreq: setfreq=%d\n", freq));
234	/*
235	 * Freq now is in Hz.  We need to convert it to the frequency
236	 * that the radio wants.  This frequency is 10.7MHz above
237	 * the actual frequency.  We then need to convert to
238	 * units of 12.5kHz.  We add one to the IFM to make rounding
239	 * easier.
240	 */
241	freq = (freq * 1000 + 10700001) / 12500;
242	(void)udsbr_req(sc, 0x01, (freq >> 8) & 0xff, freq & 0xff);
243	(void)udsbr_req(sc, 0x00, 0x0096, 0x00b7);
244	usbd_delay_ms(sc->sc_udev, 240); /* wait for signal to settle */
245}
246
247int
248udsbr_status(struct udsbr_softc *sc)
249{
250	return udsbr_req(sc, 0x00, 0x0000, 0x0024);
251}
252
253
254int
255udsbr_get_info(void *v, struct radio_info *ri)
256{
257	struct udsbr_softc *sc = v;
258
259	ri->mute = sc->sc_mute;
260	ri->volume = sc->sc_vol ? 255 : 0;
261	ri->caps = RADIO_CAPS_DETECT_STEREO;
262	ri->rfreq = 0;
263	ri->lock = 0;
264	ri->freq = sc->sc_freq;
265	ri->info = udsbr_status(sc) ? RADIO_INFO_STEREO : 0;
266
267	return 0;
268}
269
270int
271udsbr_set_info(void *v, struct radio_info *ri)
272{
273	struct udsbr_softc *sc = v;
274
275	sc->sc_mute = ri->mute != 0;
276	sc->sc_vol = ri->volume != 0;
277	sc->sc_freq = ri->freq;
278	udsbr_setfreq(sc, sc->sc_freq);
279
280	if (sc->sc_mute || sc->sc_vol == 0)
281		udsbr_stop(sc);
282	else
283		udsbr_start(sc);
284
285	return 0;
286}
287