274 lines
6.1 KiB
C
274 lines
6.1 KiB
C
/*
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* Greybus legacy-protocol driver
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*
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* Copyright 2015 Google Inc.
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* Copyright 2015 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include "greybus.h"
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#include "legacy.h"
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#include "protocol.h"
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struct legacy_connection {
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struct gb_connection *connection;
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bool initialized;
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struct gb_protocol *protocol;
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};
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struct legacy_data {
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size_t num_cports;
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struct legacy_connection *connections;
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};
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static int legacy_connection_get_version(struct gb_connection *connection)
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{
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int ret;
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ret = gb_protocol_get_version(connection);
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if (ret) {
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dev_err(&connection->hd->dev,
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"%s: failed to get protocol version: %d\n",
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connection->name, ret);
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return ret;
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}
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return 0;
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}
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static int legacy_request_handler(struct gb_operation *operation)
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{
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struct gb_protocol *protocol = operation->connection->protocol;
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return protocol->request_recv(operation->type, operation);
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}
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static int legacy_connection_init(struct legacy_connection *lc)
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{
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struct gb_connection *connection = lc->connection;
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int ret;
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dev_dbg(&connection->bundle->dev, "%s - %s\n", __func__,
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connection->name);
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ret = gb_connection_enable(connection);
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if (ret)
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return ret;
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ret = legacy_connection_get_version(connection);
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if (ret)
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goto err_disable;
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ret = connection->protocol->connection_init(connection);
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if (ret)
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goto err_disable;
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lc->initialized = true;
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return 0;
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err_disable:
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gb_connection_disable(connection);
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return ret;
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}
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static void legacy_connection_exit(struct legacy_connection *lc)
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{
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struct gb_connection *connection = lc->connection;
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if (!lc->initialized)
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return;
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gb_connection_disable(connection);
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connection->protocol->connection_exit(connection);
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lc->initialized = false;
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}
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static int legacy_connection_create(struct legacy_connection *lc,
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struct gb_bundle *bundle,
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struct greybus_descriptor_cport *desc)
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{
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struct gb_connection *connection;
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struct gb_protocol *protocol;
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gb_request_handler_t handler;
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u8 major, minor;
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int ret;
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/*
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* The legacy protocols have always been looked up using a hard-coded
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* version of 0.1, despite (or perhaps rather, due to) the fact that
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* module version negotiation could not take place until after the
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* protocol was bound.
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*/
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major = 0;
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minor = 1;
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protocol = gb_protocol_get(desc->protocol_id, major, minor);
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if (!protocol) {
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dev_err(&bundle->dev,
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"protocol 0x%02x version %u.%u not found\n",
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desc->protocol_id, major, minor);
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return -EPROTONOSUPPORT;
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}
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if (protocol->request_recv)
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handler = legacy_request_handler;
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else
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handler = NULL;
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connection = gb_connection_create(bundle, le16_to_cpu(desc->id),
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handler);
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if (IS_ERR(connection)) {
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ret = PTR_ERR(connection);
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goto err_protocol_put;
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}
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/*
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* NOTE: We need to keep a pointer to the protocol in the actual
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* connection structure for now.
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*/
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connection->protocol = protocol;
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lc->connection = connection;
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lc->protocol = protocol;
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return 0;
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err_protocol_put:
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gb_protocol_put(protocol);
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return ret;
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}
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static void legacy_connection_destroy(struct legacy_connection *lc)
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{
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lc->connection->protocol = NULL;
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gb_connection_destroy(lc->connection);
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gb_protocol_put(lc->protocol);
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}
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static int legacy_probe(struct gb_bundle *bundle,
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const struct greybus_bundle_id *id)
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{
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struct greybus_descriptor_cport *cport_desc;
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struct legacy_data *data;
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struct legacy_connection *lc;
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int i;
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int ret;
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dev_dbg(&bundle->dev,
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"%s - bundle class = 0x%02x, num_cports = %zu\n",
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__func__, bundle->class, bundle->num_cports);
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->num_cports = bundle->num_cports;
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data->connections = kcalloc(data->num_cports,
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sizeof(*data->connections),
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GFP_KERNEL);
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if (!data->connections) {
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ret = -ENOMEM;
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goto err_free_data;
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}
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for (i = 0; i < data->num_cports; ++i) {
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cport_desc = &bundle->cport_desc[i];
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lc = &data->connections[i];
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ret = legacy_connection_create(lc, bundle, cport_desc);
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if (ret)
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goto err_connections_destroy;
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}
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greybus_set_drvdata(bundle, data);
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for (i = 0; i < data->num_cports; ++i) {
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lc = &data->connections[i];
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ret = legacy_connection_init(lc);
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if (ret)
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goto err_connections_disable;
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}
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return 0;
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err_connections_disable:
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for (--i; i >= 0; --i)
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legacy_connection_exit(&data->connections[i]);
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err_connections_destroy:
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for (i = 0; i < data->num_cports; ++i)
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legacy_connection_destroy(&data->connections[i]);
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kfree(data->connections);
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err_free_data:
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kfree(data);
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return ret;
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}
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static void legacy_disconnect(struct gb_bundle *bundle)
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{
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struct legacy_data *data = greybus_get_drvdata(bundle);
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int i;
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dev_dbg(&bundle->dev, "%s - bundle class = 0x%02x\n", __func__,
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bundle->class);
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for (i = 0; i < data->num_cports; ++i) {
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legacy_connection_exit(&data->connections[i]);
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legacy_connection_destroy(&data->connections[i]);
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}
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kfree(data->connections);
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kfree(data);
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}
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static const struct greybus_bundle_id legacy_id_table[] = {
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_GPIO) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_I2C) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_UART) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_USB) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_SDIO) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_POWER_SUPPLY) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_PWM) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_SPI) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_DISPLAY) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_CAMERA) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_SENSOR) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_LIGHTS) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_LOOPBACK) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_AUDIO_MGMT) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_AUDIO_DATA) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_SVC) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_FIRMWARE) },
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_RAW) },
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{ }
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};
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MODULE_DEVICE_TABLE(greybus, legacy_id_table);
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static struct greybus_driver legacy_driver = {
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.name = "legacy",
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.probe = legacy_probe,
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.disconnect = legacy_disconnect,
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.id_table = legacy_id_table,
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};
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int gb_legacy_init(void)
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{
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return greybus_register(&legacy_driver);
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}
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void gb_legacy_exit(void)
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{
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greybus_deregister(&legacy_driver);
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}
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