1/* $NetBSD: emdtv_i2c.c,v 1.1 2011/07/11 18:02:04 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2008, 2010 Jared D. McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: emdtv_i2c.c,v 1.1 2011/07/11 18:02:04 jmcneill Exp $");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/device.h>
35#include <sys/conf.h>
36
37#include <dev/usb/usb.h>
38#include <dev/usb/usbdi.h>
39#include <dev/usb/usbdi_util.h>
40#include <dev/usb/usbdevs.h>
41
42#include <dev/i2c/i2cvar.h>
43
44#include <dev/usb/emdtvvar.h>
45#include <dev/usb/emdtvreg.h>
46
47static int emdtv_i2c_acquire_bus(void *, int);
48static void emdtv_i2c_release_bus(void *, int);
49static int emdtv_i2c_exec(void *, i2c_op_t, i2c_addr_t,
50 const void *, size_t, void *, size_t, int);
51
52static int emdtv_i2c_check(struct emdtv_softc *, i2c_addr_t);
53static int emdtv_i2c_recv(struct emdtv_softc *, i2c_addr_t,
54 uint8_t *, size_t);
55static int emdtv_i2c_send(struct emdtv_softc *, i2c_addr_t,
56 const uint8_t *, size_t, bool);
57
58int
59emdtv_i2c_attach(struct emdtv_softc *sc)
60{
61 mutex_init(&sc->sc_i2c_lock, MUTEX_DEFAULT, IPL_VM);
62 sc->sc_i2c.ic_cookie = sc;
63 sc->sc_i2c.ic_acquire_bus = emdtv_i2c_acquire_bus;
64 sc->sc_i2c.ic_release_bus = emdtv_i2c_release_bus;
65 sc->sc_i2c.ic_exec = emdtv_i2c_exec;
66
67 return 0;
68}
69
70int
71emdtv_i2c_detach(struct emdtv_softc *sc, int flags)
72{
73 mutex_destroy(&sc->sc_i2c_lock);
74
75 return 0;
76}
77
78static int
79emdtv_i2c_acquire_bus(void *opaque, int flags)
80{
81 struct emdtv_softc *sc = opaque;
82
83 mutex_enter(&sc->sc_i2c_lock);
84
85 return 0;
86}
87
88static int
89emdtv_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr,
90 const void *cmd, size_t cmdlen, void *vbuf, size_t buflen, int flags)
91{
92 struct emdtv_softc *sc = opaque;
93 int error;
94
95 if (I2C_OP_READ_P(op)) {
96 if (buflen == 0)
97 error = emdtv_i2c_check(sc, addr);
98 else
99 error = emdtv_i2c_recv(sc, addr, vbuf, buflen);
100 } else {
101 error = emdtv_i2c_send(sc, addr, cmd, cmdlen,
102 I2C_OP_STOP_P(op));
103 error = 0;
104 }
105
106 return error;
107}
108
109static void
110emdtv_i2c_release_bus(void *opaque, int flags)
111{
112 struct emdtv_softc *sc = opaque;
113
114 mutex_exit(&sc->sc_i2c_lock);
115}
116
117static int
118emdtv_i2c_check(struct emdtv_softc *sc, i2c_addr_t addr)
119{
120 emdtv_read_1(sc, EM28XX_UR_I2C, addr);
121 if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
122 device_printf(sc->sc_dev, "%s failed\n", __func__);
123 return ENXIO;
124 }
125 return 0;
126}
127
128static int
129emdtv_i2c_recv(struct emdtv_softc *sc, i2c_addr_t addr, uint8_t *datap,
130 size_t len)
131{
132 emdtv_read_multi_1(sc, EM28XX_UR_I2C, addr, datap, len);
133 if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
134 device_printf(sc->sc_dev, "%s failed\n", __func__);
135 return ENXIO;
136 }
137 return 0;
138}
139
140static int
141emdtv_i2c_send(struct emdtv_softc *sc, i2c_addr_t addr, const uint8_t *datap,
142 size_t len, bool stop)
143{
144 int off = (stop == false ? 1 : 0);
145 emdtv_write_multi_1(sc, EM28XX_UR_I2C + off, addr, datap, len);
146 if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
147 device_printf(sc->sc_dev, "%s failed\n", __func__);
148 return ENXIO;
149 }
150 return 0;
151}
152