1 /* $NetBSD: emdtv_i2c.c,v 1.2 2019/12/22 23:23:32 thorpej 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 1.2 2019/12/22 23:23:32 thorpej 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_exec(void *, i2c_op_t, i2c_addr_t, 48 const void *, size_t, void *, size_t, int); 49 50 static int emdtv_i2c_check(struct emdtv_softc *, i2c_addr_t); 51 static int emdtv_i2c_recv(struct emdtv_softc *, i2c_addr_t, 52 uint8_t *, size_t); 53 static int emdtv_i2c_send(struct emdtv_softc *, i2c_addr_t, 54 const uint8_t *, size_t, bool); 55 56 int 57 emdtv_i2c_attach(struct emdtv_softc *sc) 58 { 59 iic_tag_init(&sc->sc_i2c); 60 sc->sc_i2c.ic_cookie = sc; 61 sc->sc_i2c.ic_exec = emdtv_i2c_exec; 62 63 return 0; 64 } 65 66 int 67 emdtv_i2c_detach(struct emdtv_softc *sc, int flags) 68 { 69 iic_tag_fini(&sc->sc_i2c); 70 71 return 0; 72 } 73 74 static int 75 emdtv_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr, 76 const void *cmd, size_t cmdlen, void *vbuf, size_t buflen, int flags) 77 { 78 struct emdtv_softc *sc = opaque; 79 int error; 80 81 if (I2C_OP_READ_P(op)) { 82 if (buflen == 0) 83 error = emdtv_i2c_check(sc, addr); 84 else 85 error = emdtv_i2c_recv(sc, addr, vbuf, buflen); 86 } else { 87 error = emdtv_i2c_send(sc, addr, cmd, cmdlen, 88 I2C_OP_STOP_P(op)); 89 error = 0; 90 } 91 92 return error; 93 } 94 95 static int 96 emdtv_i2c_check(struct emdtv_softc *sc, i2c_addr_t addr) 97 { 98 emdtv_read_1(sc, EM28XX_UR_I2C, addr); 99 if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) { 100 device_printf(sc->sc_dev, "%s failed\n", __func__); 101 return ENXIO; 102 } 103 return 0; 104 } 105 106 static int 107 emdtv_i2c_recv(struct emdtv_softc *sc, i2c_addr_t addr, uint8_t *datap, 108 size_t len) 109 { 110 emdtv_read_multi_1(sc, EM28XX_UR_I2C, addr, datap, len); 111 if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) { 112 device_printf(sc->sc_dev, "%s failed\n", __func__); 113 return ENXIO; 114 } 115 return 0; 116 } 117 118 static int 119 emdtv_i2c_send(struct emdtv_softc *sc, i2c_addr_t addr, const uint8_t *datap, 120 size_t len, bool stop) 121 { 122 int off = (stop == false ? 1 : 0); 123 emdtv_write_multi_1(sc, EM28XX_UR_I2C + off, addr, datap, len); 124 if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) { 125 device_printf(sc->sc_dev, "%s failed\n", __func__); 126 return ENXIO; 127 } 128 return 0; 129 } 130