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
  15 static struct spilib_ops *spilib_ops;
  16
  17 static 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
  42 exit_connection_disable:
  43         gb_connection_disable(connection);
  44 exit_connection_destroy:
  45         gb_connection_destroy(connection);
  46
  47         return ret;
  48 }
  49
  50 static 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
  64 static const struct gbphy_device_id gb_spi_id_table[] = {
  65         { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_SPI) },
  66         { },
  67 };
  68 MODULE_DEVICE_TABLE(gbphy, gb_spi_id_table);
  69
  70 static 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
  77 module_gbphy_driver(spi_driver);
  78 MODULE_LICENSE("GPL v2");