1 /* $NetBSD: fdt_i2c.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2015 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: fdt_i2c.c,v 1.2 2015/12/16 12:17:45 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 #include <sys/kmem.h> 35 36 #include <libfdt.h> 37 #include <dev/fdt/fdtvar.h> 38 39 struct fdtbus_i2c_controller { 40 device_t i2c_dev; 41 int i2c_phandle; 42 const struct fdtbus_i2c_controller_func *i2c_funcs; 43 44 struct fdtbus_i2c_controller *i2c_next; 45 }; 46 47 static struct fdtbus_i2c_controller *fdtbus_i2c = NULL; 48 49 int 50 fdtbus_register_i2c_controller(device_t dev, int phandle, 51 const struct fdtbus_i2c_controller_func *funcs) 52 { 53 struct fdtbus_i2c_controller *i2c; 54 55 i2c = kmem_alloc(sizeof(*i2c), KM_SLEEP); 56 i2c->i2c_dev = dev; 57 i2c->i2c_phandle = phandle; 58 i2c->i2c_funcs = funcs; 59 60 i2c->i2c_next = fdtbus_i2c; 61 fdtbus_i2c = i2c; 62 63 return 0; 64 } 65 66 static struct fdtbus_i2c_controller * 67 fdtbus_get_i2c_controller(int phandle) 68 { 69 struct fdtbus_i2c_controller *i2c; 70 71 for (i2c = fdtbus_i2c; i2c; i2c = i2c->i2c_next) { 72 if (i2c->i2c_phandle == phandle) { 73 return i2c; 74 } 75 } 76 77 return NULL; 78 } 79 80 i2c_tag_t 81 fdtbus_get_i2c_tag(int phandle) 82 { 83 struct fdtbus_i2c_controller *i2c; 84 85 i2c = fdtbus_get_i2c_controller(phandle); 86 if (i2c == NULL) 87 return NULL; 88 89 return i2c->i2c_funcs->get_tag(i2c->i2c_dev); 90 } 91