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 | |
47 | static int emdtv_i2c_acquire_bus(void *, int); |
48 | static void emdtv_i2c_release_bus(void *, int); |
49 | static int emdtv_i2c_exec(void *, i2c_op_t, i2c_addr_t, |
50 | const void *, size_t, void *, size_t, int); |
51 | |
52 | static int emdtv_i2c_check(struct emdtv_softc *, i2c_addr_t); |
53 | static int emdtv_i2c_recv(struct emdtv_softc *, i2c_addr_t, |
54 | uint8_t *, size_t); |
55 | static int emdtv_i2c_send(struct emdtv_softc *, i2c_addr_t, |
56 | const uint8_t *, size_t, bool); |
57 | |
58 | int |
59 | emdtv_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 | |
70 | int |
71 | emdtv_i2c_detach(struct emdtv_softc *sc, int flags) |
72 | { |
73 | mutex_destroy(&sc->sc_i2c_lock); |
74 | |
75 | return 0; |
76 | } |
77 | |
78 | static int |
79 | emdtv_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 | |
88 | static int |
89 | emdtv_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 | |
109 | static void |
110 | emdtv_i2c_release_bus(void *opaque, int flags) |
111 | { |
112 | struct emdtv_softc *sc = opaque; |
113 | |
114 | mutex_exit(&sc->sc_i2c_lock); |
115 | } |
116 | |
117 | static int |
118 | emdtv_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 | |
128 | static int |
129 | emdtv_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 | |
140 | static int |
141 | emdtv_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 | |