fdt_i2c.c revision 1.2.18.2
1 1.2.18.2 jdolecek /* $NetBSD: fdt_i2c.c,v 1.2.18.2 2017/12/03 11:37:01 jdolecek Exp $ */ 2 1.2.18.2 jdolecek 3 1.2.18.2 jdolecek /*- 4 1.2.18.2 jdolecek * Copyright (c) 2015 Jared D. McNeill <jmcneill (at) invisible.ca> 5 1.2.18.2 jdolecek * All rights reserved. 6 1.2.18.2 jdolecek * 7 1.2.18.2 jdolecek * Redistribution and use in source and binary forms, with or without 8 1.2.18.2 jdolecek * modification, are permitted provided that the following conditions 9 1.2.18.2 jdolecek * are met: 10 1.2.18.2 jdolecek * 1. Redistributions of source code must retain the above copyright 11 1.2.18.2 jdolecek * notice, this list of conditions and the following disclaimer. 12 1.2.18.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 13 1.2.18.2 jdolecek * notice, this list of conditions and the following disclaimer in the 14 1.2.18.2 jdolecek * documentation and/or other materials provided with the distribution. 15 1.2.18.2 jdolecek * 16 1.2.18.2 jdolecek * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 1.2.18.2 jdolecek * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 1.2.18.2 jdolecek * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 1.2.18.2 jdolecek * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 1.2.18.2 jdolecek * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 1.2.18.2 jdolecek * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 1.2.18.2 jdolecek * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 1.2.18.2 jdolecek * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 1.2.18.2 jdolecek * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 1.2.18.2 jdolecek * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 1.2.18.2 jdolecek * SUCH DAMAGE. 27 1.2.18.2 jdolecek */ 28 1.2.18.2 jdolecek 29 1.2.18.2 jdolecek #include <sys/cdefs.h> 30 1.2.18.2 jdolecek __KERNEL_RCSID(0, "$NetBSD: fdt_i2c.c,v 1.2.18.2 2017/12/03 11:37:01 jdolecek Exp $"); 31 1.2.18.2 jdolecek 32 1.2.18.2 jdolecek #include <sys/param.h> 33 1.2.18.2 jdolecek #include <sys/bus.h> 34 1.2.18.2 jdolecek #include <sys/kmem.h> 35 1.2.18.2 jdolecek 36 1.2.18.2 jdolecek #include <libfdt.h> 37 1.2.18.2 jdolecek #include <dev/fdt/fdtvar.h> 38 1.2.18.2 jdolecek 39 1.2.18.2 jdolecek struct fdtbus_i2c_controller { 40 1.2.18.2 jdolecek device_t i2c_dev; 41 1.2.18.2 jdolecek int i2c_phandle; 42 1.2.18.2 jdolecek const struct fdtbus_i2c_controller_func *i2c_funcs; 43 1.2.18.2 jdolecek 44 1.2.18.2 jdolecek struct fdtbus_i2c_controller *i2c_next; 45 1.2.18.2 jdolecek }; 46 1.2.18.2 jdolecek 47 1.2.18.2 jdolecek static struct fdtbus_i2c_controller *fdtbus_i2c = NULL; 48 1.2.18.2 jdolecek 49 1.2.18.2 jdolecek int 50 1.2.18.2 jdolecek fdtbus_register_i2c_controller(device_t dev, int phandle, 51 1.2.18.2 jdolecek const struct fdtbus_i2c_controller_func *funcs) 52 1.2.18.2 jdolecek { 53 1.2.18.2 jdolecek struct fdtbus_i2c_controller *i2c; 54 1.2.18.2 jdolecek 55 1.2.18.2 jdolecek i2c = kmem_alloc(sizeof(*i2c), KM_SLEEP); 56 1.2.18.2 jdolecek i2c->i2c_dev = dev; 57 1.2.18.2 jdolecek i2c->i2c_phandle = phandle; 58 1.2.18.2 jdolecek i2c->i2c_funcs = funcs; 59 1.2.18.2 jdolecek 60 1.2.18.2 jdolecek i2c->i2c_next = fdtbus_i2c; 61 1.2.18.2 jdolecek fdtbus_i2c = i2c; 62 1.2.18.2 jdolecek 63 1.2.18.2 jdolecek return 0; 64 1.2.18.2 jdolecek } 65 1.2.18.2 jdolecek 66 1.2.18.2 jdolecek static struct fdtbus_i2c_controller * 67 1.2.18.2 jdolecek fdtbus_get_i2c_controller(int phandle) 68 1.2.18.2 jdolecek { 69 1.2.18.2 jdolecek struct fdtbus_i2c_controller *i2c; 70 1.2.18.2 jdolecek 71 1.2.18.2 jdolecek for (i2c = fdtbus_i2c; i2c; i2c = i2c->i2c_next) { 72 1.2.18.2 jdolecek if (i2c->i2c_phandle == phandle) { 73 1.2.18.2 jdolecek return i2c; 74 1.2.18.2 jdolecek } 75 1.2.18.2 jdolecek } 76 1.2.18.2 jdolecek 77 1.2.18.2 jdolecek return NULL; 78 1.2.18.2 jdolecek } 79 1.2.18.2 jdolecek 80 1.2.18.2 jdolecek i2c_tag_t 81 1.2.18.2 jdolecek fdtbus_get_i2c_tag(int phandle) 82 1.2.18.2 jdolecek { 83 1.2.18.2 jdolecek struct fdtbus_i2c_controller *i2c; 84 1.2.18.2 jdolecek 85 1.2.18.2 jdolecek i2c = fdtbus_get_i2c_controller(phandle); 86 1.2.18.2 jdolecek if (i2c == NULL) 87 1.2.18.2 jdolecek return NULL; 88 1.2.18.2 jdolecek 89 1.2.18.2 jdolecek return i2c->i2c_funcs->get_tag(i2c->i2c_dev); 90 1.2.18.2 jdolecek } 91
Indexes created Tue Sep 30 11:09:46 GMT 2025