ofw_i2c_subr.c revision 1.1.6.1
1 /* $NetBSD: ofw_i2c_subr.c,v 1.1.6.1 2021/04/25 22:16:05 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2021 The NetBSD Foundation, Inc. 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 /* 30 * Copyright 1998 31 * Digital Equipment Corporation. All rights reserved. 32 * 33 * This software is furnished under license and may be used and 34 * copied only in accordance with the following terms and conditions. 35 * Subject to these conditions, you may download, copy, install, 36 * use, modify and distribute this software in source and/or binary 37 * form. No title or ownership is transferred hereby. 38 * 39 * 1) Any source code used, modified or distributed must reproduce 40 * and retain this copyright notice and list of conditions as 41 * they appear in the source file. 42 * 43 * 2) No right is granted to use any trade name, trademark, or logo of 44 * Digital Equipment Corporation. Neither the "Digital Equipment 45 * Corporation" name nor any trademark or logo of Digital Equipment 46 * Corporation may be used to endorse or promote products derived 47 * from this software without the prior written permission of 48 * Digital Equipment Corporation. 49 * 50 * 3) This software is provided "AS-IS" and any express or implied 51 * warranties, including but not limited to, any implied warranties 52 * of merchantability, fitness for a particular purpose, or 53 * non-infringement are disclaimed. In no event shall DIGITAL be 54 * liable for any damages whatsoever, and in particular, DIGITAL 55 * shall not be liable for special, indirect, consequential, or 56 * incidental damages or damages for lost profits, loss of 57 * revenue or loss of use, whether such damages arise in contract, 58 * negligence, tort, under statute, in equity, at law or otherwise, 59 * even if advised of the possibility of such damage. 60 */ 61 62 #include <sys/cdefs.h> 63 __KERNEL_RCSID(0, "$NetBSD: ofw_i2c_subr.c,v 1.1.6.1 2021/04/25 22:16:05 thorpej Exp $"); 64 65 #include <sys/param.h> 66 #include <sys/device.h> 67 #include <sys/kmem.h> 68 #include <sys/systm.h> 69 #include <dev/ofw/openfirm.h> 70 #include <dev/i2c/i2cvar.h> 71 72 /* 73 * Standard routine for fetching an i2c device address, according 74 * to the standard OpenFirmware / Device Tree bindings. 75 */ 76 static bool 77 of_i2c_get_address(int node, uint32_t *addrp) 78 { 79 uint32_t reg; 80 81 if (of_getprop_uint32(node, "reg", ®) == -1) { 82 return false; 83 } 84 85 *addrp = reg; 86 return true; 87 } 88 89 static int 90 of_i2c_enumerate_devices(device_t dev, devhandle_t call_handle, void *v) 91 { 92 return of_i2c_enumerate_devices_ext(dev, call_handle, v, 93 of_i2c_get_address); 94 } 95 OF_DEVICE_CALL_REGISTER("i2c-enumerate-devices", of_i2c_enumerate_devices); 96 97 int 98 of_i2c_enumerate_devices_ext(device_t dev, devhandle_t call_handle, void *v, 99 bool (*get_address)(int, uint32_t *)) 100 { 101 struct i2c_enumerate_devices_args *args = v; 102 int i2c_node, node; 103 char name[32], compat_buf[32]; 104 prop_dictionary_t props; 105 uint32_t addr; 106 char *clist; 107 int clist_size; 108 bool cbrv; 109 110 i2c_node = devhandle_to_of(call_handle); 111 112 for (node = OF_child(i2c_node); node != 0; node = OF_peer(node)) { 113 if (OF_getprop(node, "name", name, sizeof(name)) <= 0) { 114 continue; 115 } 116 if (!get_address(node, &addr)) { 117 continue; 118 } 119 120 clist_size = OF_getproplen(node, "compatible"); 121 clist = kmem_tmpbuf_alloc(clist_size, 122 compat_buf, sizeof(compat_buf), KM_SLEEP); 123 if (OF_getprop(node, "compatible", clist, clist_size) < 124 clist_size) { 125 kmem_tmpbuf_free(clist, clist_size, compat_buf); 126 continue; 127 } 128 props = prop_dictionary_create(); 129 130 args->ia->ia_addr = (i2c_addr_t)addr; 131 args->ia->ia_name = name; 132 args->ia->ia_clist = clist; 133 args->ia->ia_clist_size = clist_size; 134 args->ia->ia_prop = props; 135 args->ia->ia_devhandle = devhandle_from_of(node); 136 args->ia->ia_cookie = node; /* XXX */ 137 args->ia->ia_cookietype = I2C_COOKIE_OF; /* XXX */ 138 139 cbrv = args->callback(dev, args); 140 141 prop_object_release(props); 142 kmem_tmpbuf_free(clist, clist_size, compat_buf); 143 144 if (!cbrv) { 145 break; 146 } 147 } 148 149 return 0; 150 } 151
Indexes created Tue Sep 30 11:09:46 GMT 2025