130 lines
3.8 KiB
C
130 lines
3.8 KiB
C
/* $NetBSD: emdtv_i2c.c,v 1.2 2019/12/22 23:23:32 thorpej Exp $ */
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/*-
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* Copyright (c) 2008, 2010 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: emdtv_i2c.c,v 1.2 2019/12/22 23:23:32 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <dev/usb/usb.h>
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#include <dev/usb/usbdi.h>
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#include <dev/usb/usbdi_util.h>
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#include <dev/usb/usbdevs.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/usb/emdtvvar.h>
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#include <dev/usb/emdtvreg.h>
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static int emdtv_i2c_exec(void *, i2c_op_t, i2c_addr_t,
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const void *, size_t, void *, size_t, int);
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static int emdtv_i2c_check(struct emdtv_softc *, i2c_addr_t);
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static int emdtv_i2c_recv(struct emdtv_softc *, i2c_addr_t,
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uint8_t *, size_t);
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static int emdtv_i2c_send(struct emdtv_softc *, i2c_addr_t,
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const uint8_t *, size_t, bool);
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int
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emdtv_i2c_attach(struct emdtv_softc *sc)
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{
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iic_tag_init(&sc->sc_i2c);
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sc->sc_i2c.ic_cookie = sc;
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sc->sc_i2c.ic_exec = emdtv_i2c_exec;
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return 0;
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}
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int
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emdtv_i2c_detach(struct emdtv_softc *sc, int flags)
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{
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iic_tag_fini(&sc->sc_i2c);
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return 0;
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}
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static int
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emdtv_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr,
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const void *cmd, size_t cmdlen, void *vbuf, size_t buflen, int flags)
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{
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struct emdtv_softc *sc = opaque;
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int error;
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if (I2C_OP_READ_P(op)) {
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if (buflen == 0)
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error = emdtv_i2c_check(sc, addr);
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else
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error = emdtv_i2c_recv(sc, addr, vbuf, buflen);
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} else {
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error = emdtv_i2c_send(sc, addr, cmd, cmdlen,
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I2C_OP_STOP_P(op));
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error = 0;
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}
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return error;
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}
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static int
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emdtv_i2c_check(struct emdtv_softc *sc, i2c_addr_t addr)
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{
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emdtv_read_1(sc, EM28XX_UR_I2C, addr);
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if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
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device_printf(sc->sc_dev, "%s failed\n", __func__);
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return ENXIO;
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}
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return 0;
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}
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static int
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emdtv_i2c_recv(struct emdtv_softc *sc, i2c_addr_t addr, uint8_t *datap,
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size_t len)
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{
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emdtv_read_multi_1(sc, EM28XX_UR_I2C, addr, datap, len);
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if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
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device_printf(sc->sc_dev, "%s failed\n", __func__);
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return ENXIO;
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}
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return 0;
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}
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static int
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emdtv_i2c_send(struct emdtv_softc *sc, i2c_addr_t addr, const uint8_t *datap,
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size_t len, bool stop)
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{
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int off = (stop == false ? 1 : 0);
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emdtv_write_multi_1(sc, EM28XX_UR_I2C + off, addr, datap, len);
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if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
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device_printf(sc->sc_dev, "%s failed\n", __func__);
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return ENXIO;
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}
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return 0;
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}
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