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