1/* $NetBSD: fdt_i2c.c,v 1.12 2022/02/23 07:55:55 skrll 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 1.12 2022/02/23 07:55:55 skrll Exp $"); 31 32#include <sys/param.h> 33#include <sys/bus.h> 34#include <sys/kmem.h> 35#include <sys/queue.h> 36 37#include <libfdt.h> 38#include <dev/fdt/fdtvar.h> 39 40struct fdtbus_i2c_controller { 41 i2c_tag_t i2c_tag; 42 int i2c_phandle; 43 44 LIST_ENTRY(fdtbus_i2c_controller) i2c_next; 45}; 46 47static LIST_HEAD(, fdtbus_i2c_controller) fdtbus_i2c_controllers = 48 LIST_HEAD_INITIALIZER(fdtbus_i2c_controllers); 49 50int 51fdtbus_register_i2c_controller(i2c_tag_t tag, int phandle) 52{ 53 struct fdtbus_i2c_controller *i2c; 54 55 i2c = kmem_alloc(sizeof(*i2c), KM_SLEEP); 56 i2c->i2c_tag = tag; 57 i2c->i2c_phandle = phandle; 58 59 LIST_INSERT_HEAD(&fdtbus_i2c_controllers, i2c, i2c_next); 60 61 return 0; 62} 63 64static struct fdtbus_i2c_controller * 65fdtbus_get_i2c_controller(int phandle) 66{ 67 struct fdtbus_i2c_controller *i2c; 68 69 LIST_FOREACH(i2c, &fdtbus_i2c_controllers, i2c_next) { 70 if (i2c->i2c_phandle == phandle) 71 return i2c; 72 } 73 74 return NULL; 75} 76 77i2c_tag_t 78fdtbus_i2c_get_tag(int phandle) 79{ 80 struct fdtbus_i2c_controller *i2c; 81 82 i2c = fdtbus_get_i2c_controller(phandle); 83 if (i2c == NULL) 84 return NULL; 85 86 return i2c->i2c_tag; 87} 88 89i2c_tag_t 90fdtbus_i2c_acquire(int phandle, const char *prop) 91{ 92 int i2c_phandle; 93 94 i2c_phandle = fdtbus_get_phandle(phandle, prop); 95 if (i2c_phandle == -1) 96 return NULL; 97 98 return fdtbus_i2c_get_tag(i2c_phandle); 99} 100 101device_t 102fdtbus_attach_i2cbus(device_t dev, int phandle, i2c_tag_t tag, cfprint_t print) 103{ 104 struct i2cbus_attach_args iba; 105 prop_dictionary_t devs, props; 106 device_t ret; 107 u_int address_cells; 108 109 devs = prop_dictionary_create(); 110 if (of_getprop_uint32(phandle, "#address-cells", &address_cells)) 111 address_cells = 1; 112 113 of_enter_i2c_devs(devs, phandle, address_cells * 4, 0); 114 115 memset(&iba, 0, sizeof(iba)); 116 iba.iba_tag = tag; 117 iba.iba_child_devices = prop_dictionary_get(devs, "i2c-child-devices"); 118 if (iba.iba_child_devices) 119 prop_object_retain(iba.iba_child_devices); 120 prop_object_release(devs); 121 122 props = device_properties(dev); 123 prop_dictionary_set_bool(props, "i2c-no-indirect-config", true); 124 125 ret = config_found(dev, &iba, print, 126 CFARGS(.iattr = "i2cbus")); 127 if (iba.iba_child_devices) 128 prop_object_release(iba.iba_child_devices); 129 130 return ret; 131} 132