staging/greybus/spi.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  * SPI bridge PHY driver.
0004  *
0005  * Copyright 2014-2016 Google Inc.
0006  * Copyright 2014-2016 Linaro Ltd.
0007  */
0008
0009 #include <linux/module.h>
0010 #include <linux/greybus.h>
0011
0012 #include "gbphy.h"
0013 #include "spilib.h"
0014
0015 static struct spilib_ops *spilib_ops;
0016
0017 static int gb_spi_probe(struct gbphy_device *gbphy_dev,
0018             const struct gbphy_device_id *id)
0019 {
0020     struct gb_connection *connection;
0021     int ret;
0022
0023     connection = gb_connection_create(gbphy_dev->bundle,
0024                       le16_to_cpu(gbphy_dev->cport_desc->id),
0025                       NULL);
0026     if (IS_ERR(connection))
0027         return PTR_ERR(connection);
0028
0029     ret = gb_connection_enable(connection);
0030     if (ret)
0031         goto exit_connection_destroy;
0032
0033     ret = gb_spilib_master_init(connection, &gbphy_dev->dev, spilib_ops);
0034     if (ret)
0035         goto exit_connection_disable;
0036
0037     gb_gbphy_set_data(gbphy_dev, connection);
0038
0039     gbphy_runtime_put_autosuspend(gbphy_dev);
0040     return 0;
0041
0042 exit_connection_disable:
0043     gb_connection_disable(connection);
0044 exit_connection_destroy:
0045     gb_connection_destroy(connection);
0046
0047     return ret;
0048 }
0049
0050 static void gb_spi_remove(struct gbphy_device *gbphy_dev)
0051 {
0052     struct gb_connection *connection = gb_gbphy_get_data(gbphy_dev);
0053     int ret;
0054
0055     ret = gbphy_runtime_get_sync(gbphy_dev);
0056     if (ret)
0057         gbphy_runtime_get_noresume(gbphy_dev);
0058
0059     gb_spilib_master_exit(connection);
0060     gb_connection_disable(connection);
0061     gb_connection_destroy(connection);
0062 }
0063
0064 static const struct gbphy_device_id gb_spi_id_table[] = {
0065     { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_SPI) },
0066     { },
0067 };
0068 MODULE_DEVICE_TABLE(gbphy, gb_spi_id_table);
0069
0070 static struct gbphy_driver spi_driver = {
0071     .name       = "spi",
0072     .probe      = gb_spi_probe,
0073     .remove     = gb_spi_remove,
0074     .id_table   = gb_spi_id_table,
0075 };
0076
0077 module_gbphy_driver(spi_driver);
0078 MODULE_LICENSE("GPL v2");