163 lines
3.3 KiB
C
163 lines
3.3 KiB
C
/*
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* Greybus Host Device
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*
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* Copyright 2014-2015 Google Inc.
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* Copyright 2014-2015 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include "greybus.h"
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static struct ida gb_hd_bus_id_map;
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int gb_hd_output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
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bool async)
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{
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if (!hd || !hd->driver || !hd->driver->output)
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return -EINVAL;
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return hd->driver->output(hd, req, size, cmd, async);
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}
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EXPORT_SYMBOL_GPL(gb_hd_output);
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static void gb_hd_release(struct device *dev)
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{
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struct gb_host_device *hd = to_gb_host_device(dev);
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if (hd->svc)
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gb_svc_put(hd->svc);
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ida_simple_remove(&gb_hd_bus_id_map, hd->bus_id);
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ida_destroy(&hd->cport_id_map);
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kfree(hd);
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}
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struct device_type greybus_hd_type = {
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.name = "greybus_host_device",
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.release = gb_hd_release,
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};
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struct gb_host_device *gb_hd_create(struct gb_hd_driver *driver,
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struct device *parent,
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size_t buffer_size_max,
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size_t num_cports)
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{
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struct gb_host_device *hd;
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int ret;
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/*
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* Validate that the driver implements all of the callbacks
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* so that we don't have to every time we make them.
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*/
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if ((!driver->message_send) || (!driver->message_cancel)) {
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pr_err("Must implement all gb_hd_driver callbacks!\n");
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return ERR_PTR(-EINVAL);
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}
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if (buffer_size_max < GB_OPERATION_MESSAGE_SIZE_MIN) {
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dev_err(parent, "greybus host-device buffers too small\n");
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return ERR_PTR(-EINVAL);
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}
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if (num_cports == 0 || num_cports > CPORT_ID_MAX + 1) {
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dev_err(parent, "Invalid number of CPorts: %zu\n", num_cports);
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return ERR_PTR(-EINVAL);
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}
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/*
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* Make sure to never allocate messages larger than what the Greybus
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* protocol supports.
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*/
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if (buffer_size_max > GB_OPERATION_MESSAGE_SIZE_MAX) {
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dev_warn(parent, "limiting buffer size to %u\n",
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GB_OPERATION_MESSAGE_SIZE_MAX);
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buffer_size_max = GB_OPERATION_MESSAGE_SIZE_MAX;
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}
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hd = kzalloc(sizeof(*hd) + driver->hd_priv_size, GFP_KERNEL);
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if (!hd)
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return ERR_PTR(-ENOMEM);
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ret = ida_simple_get(&gb_hd_bus_id_map, 1, 0, GFP_KERNEL);
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if (ret < 0) {
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kfree(hd);
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return ERR_PTR(ret);
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}
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hd->bus_id = ret;
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hd->driver = driver;
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INIT_LIST_HEAD(&hd->interfaces);
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INIT_LIST_HEAD(&hd->connections);
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ida_init(&hd->cport_id_map);
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hd->buffer_size_max = buffer_size_max;
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hd->num_cports = num_cports;
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hd->dev.parent = parent;
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hd->dev.bus = &greybus_bus_type;
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hd->dev.type = &greybus_hd_type;
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hd->dev.dma_mask = hd->dev.parent->dma_mask;
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device_initialize(&hd->dev);
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dev_set_name(&hd->dev, "greybus%d", hd->bus_id);
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hd->svc = gb_svc_create(hd);
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if (!hd->svc) {
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dev_err(&hd->dev, "failed to create svc\n");
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put_device(&hd->dev);
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return ERR_PTR(-ENOMEM);
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}
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return hd;
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}
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EXPORT_SYMBOL_GPL(gb_hd_create);
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int gb_hd_add(struct gb_host_device *hd)
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{
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int ret;
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ret = device_add(&hd->dev);
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if (ret)
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return ret;
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ret = gb_svc_add(hd->svc);
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if (ret) {
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device_del(&hd->dev);
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(gb_hd_add);
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void gb_hd_del(struct gb_host_device *hd)
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{
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gb_interfaces_remove(hd);
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gb_svc_del(hd->svc);
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device_del(&hd->dev);
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}
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EXPORT_SYMBOL_GPL(gb_hd_del);
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void gb_hd_put(struct gb_host_device *hd)
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{
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put_device(&hd->dev);
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}
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EXPORT_SYMBOL_GPL(gb_hd_put);
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int __init gb_hd_init(void)
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{
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ida_init(&gb_hd_bus_id_map);
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return 0;
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}
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void gb_hd_exit(void)
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{
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ida_destroy(&gb_hd_bus_id_map);
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}
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