LXR linux/drivers/staging/greybus/spi.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * SPI bridge PHY driver.
   4 *
   5 * Copyright 2014-2016 Google Inc.
   6 * Copyright 2014-2016 Linaro Ltd.
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/greybus.h>
  11
  12#include "gbphy.h"
  13#include "spilib.h"
  14
  15static struct spilib_ops *spilib_ops;
  16
  17static int gb_spi_probe(struct gbphy_device *gbphy_dev,
  18                        const struct gbphy_device_id *id)
  19{
  20        struct gb_connection *connection;
  21        int ret;
  22
  23        connection = gb_connection_create(gbphy_dev->bundle,
  24                                          le16_to_cpu(gbphy_dev->cport_desc->id),
  25                                          NULL);
  26        if (IS_ERR(connection))
  27                return PTR_ERR(connection);
  28
  29        ret = gb_connection_enable(connection);
  30        if (ret)
  31                goto exit_connection_destroy;
  32
  33        ret = gb_spilib_master_init(connection, &gbphy_dev->dev, spilib_ops);
  34        if (ret)
  35                goto exit_connection_disable;
  36
  37        gb_gbphy_set_data(gbphy_dev, connection);
  38
  39        gbphy_runtime_put_autosuspend(gbphy_dev);
  40        return 0;
  41
  42exit_connection_disable:
  43        gb_connection_disable(connection);
  44exit_connection_destroy:
  45        gb_connection_destroy(connection);
  46
  47        return ret;
  48}
  49
  50static void gb_spi_remove(struct gbphy_device *gbphy_dev)
  51{
  52        struct gb_connection *connection = gb_gbphy_get_data(gbphy_dev);
  53        int ret;
  54
  55        ret = gbphy_runtime_get_sync(gbphy_dev);
  56        if (ret)
  57                gbphy_runtime_get_noresume(gbphy_dev);
  58
  59        gb_spilib_master_exit(connection);
  60        gb_connection_disable(connection);
  61        gb_connection_destroy(connection);
  62}
  63
  64static const struct gbphy_device_id gb_spi_id_table[] = {
  65        { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_SPI) },
  66        { },
  67};
  68MODULE_DEVICE_TABLE(gbphy, gb_spi_id_table);
  69
  70static struct gbphy_driver spi_driver = {
  71        .name           = "spi",
  72        .probe          = gb_spi_probe,
  73        .remove         = gb_spi_remove,
  74        .id_table       = gb_spi_id_table,
  75};
  76
  77module_gbphy_driver(spi_driver);
  78MODULE_LICENSE("GPL v2");
  79