132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
/* $NetBSD: fdt_i2c.c,v 1.12 2022/02/23 07:55:55 skrll Exp $ */
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/*-
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* Copyright (c) 2015 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: fdt_i2c.c,v 1.12 2022/02/23 07:55:55 skrll Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kmem.h>
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#include <sys/queue.h>
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#include <libfdt.h>
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#include <dev/fdt/fdtvar.h>
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struct fdtbus_i2c_controller {
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i2c_tag_t i2c_tag;
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int i2c_phandle;
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LIST_ENTRY(fdtbus_i2c_controller) i2c_next;
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};
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static LIST_HEAD(, fdtbus_i2c_controller) fdtbus_i2c_controllers =
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LIST_HEAD_INITIALIZER(fdtbus_i2c_controllers);
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int
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fdtbus_register_i2c_controller(i2c_tag_t tag, int phandle)
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{
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struct fdtbus_i2c_controller *i2c;
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i2c = kmem_alloc(sizeof(*i2c), KM_SLEEP);
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i2c->i2c_tag = tag;
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i2c->i2c_phandle = phandle;
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LIST_INSERT_HEAD(&fdtbus_i2c_controllers, i2c, i2c_next);
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return 0;
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}
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static struct fdtbus_i2c_controller *
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fdtbus_get_i2c_controller(int phandle)
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{
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struct fdtbus_i2c_controller *i2c;
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LIST_FOREACH(i2c, &fdtbus_i2c_controllers, i2c_next) {
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if (i2c->i2c_phandle == phandle)
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return i2c;
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}
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return NULL;
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}
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i2c_tag_t
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fdtbus_i2c_get_tag(int phandle)
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{
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struct fdtbus_i2c_controller *i2c;
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i2c = fdtbus_get_i2c_controller(phandle);
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if (i2c == NULL)
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return NULL;
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return i2c->i2c_tag;
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}
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i2c_tag_t
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fdtbus_i2c_acquire(int phandle, const char *prop)
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{
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int i2c_phandle;
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i2c_phandle = fdtbus_get_phandle(phandle, prop);
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if (i2c_phandle == -1)
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return NULL;
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return fdtbus_i2c_get_tag(i2c_phandle);
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}
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device_t
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fdtbus_attach_i2cbus(device_t dev, int phandle, i2c_tag_t tag, cfprint_t print)
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{
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struct i2cbus_attach_args iba;
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prop_dictionary_t devs, props;
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device_t ret;
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u_int address_cells;
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devs = prop_dictionary_create();
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if (of_getprop_uint32(phandle, "#address-cells", &address_cells))
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address_cells = 1;
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of_enter_i2c_devs(devs, phandle, address_cells * 4, 0);
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memset(&iba, 0, sizeof(iba));
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iba.iba_tag = tag;
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iba.iba_child_devices = prop_dictionary_get(devs, "i2c-child-devices");
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if (iba.iba_child_devices)
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prop_object_retain(iba.iba_child_devices);
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prop_object_release(devs);
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props = device_properties(dev);
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prop_dictionary_set_bool(props, "i2c-no-indirect-config", true);
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ret = config_found(dev, &iba, print,
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CFARGS(.iattr = "i2cbus"));
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if (iba.iba_child_devices)
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prop_object_release(iba.iba_child_devices);
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return ret;
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}
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