Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame^] | 1 | /* |
| 2 | * SVC Greybus driver. |
| 3 | * |
| 4 | * Copyright 2015 Google Inc. |
| 5 | * Copyright 2015 Linaro Ltd. |
| 6 | * |
| 7 | * Released under the GPLv2 only. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/slab.h> |
| 13 | |
| 14 | #include "greybus.h" |
| 15 | #include "greybus_protocols.h" |
| 16 | |
| 17 | struct gb_svc { |
| 18 | struct gb_connection *connection; |
| 19 | u8 version_major; |
| 20 | u8 version_minor; |
| 21 | }; |
| 22 | |
| 23 | /* Define get_version() routine */ |
| 24 | define_get_version(gb_svc, SVC); |
| 25 | |
| 26 | static int intf_device_id_operation(struct gb_svc *svc, |
| 27 | u8 intf_id, u8 device_id) |
| 28 | { |
| 29 | struct gb_svc_intf_device_id_request request; |
| 30 | |
| 31 | request.intf_id = intf_id; |
| 32 | request.device_id = device_id; |
| 33 | |
| 34 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID, |
| 35 | &request, sizeof(request), NULL, 0); |
| 36 | } |
| 37 | |
| 38 | static int intf_reset_operation(struct gb_svc *svc, u8 intf_id) |
| 39 | { |
| 40 | struct gb_svc_intf_reset_request request; |
| 41 | |
| 42 | request.intf_id = intf_id; |
| 43 | |
| 44 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_RESET, |
| 45 | &request, sizeof(request), NULL, 0); |
| 46 | } |
| 47 | |
| 48 | static int connection_create_operation(struct gb_svc *svc, |
| 49 | u8 intf1_id, u16 cport1_id, |
| 50 | u8 intf2_id, u16 cport2_id) |
| 51 | { |
| 52 | struct gb_svc_conn_create_request request; |
| 53 | |
| 54 | request.intf1_id = intf1_id; |
| 55 | request.cport1_id = cport1_id; |
| 56 | request.intf2_id = intf2_id; |
| 57 | request.cport2_id = cport2_id; |
| 58 | |
| 59 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE, |
| 60 | &request, sizeof(request), NULL, 0); |
| 61 | } |
| 62 | |
| 63 | static int connection_destroy_operation(struct gb_svc *svc, |
| 64 | u8 intf1_id, u16 cport1_id, |
| 65 | u8 intf2_id, u16 cport2_id) |
| 66 | { |
| 67 | struct gb_svc_conn_destroy_request request; |
| 68 | |
| 69 | request.intf1_id = intf1_id; |
| 70 | request.cport1_id = cport1_id; |
| 71 | request.intf2_id = intf2_id; |
| 72 | request.cport2_id = cport2_id; |
| 73 | |
| 74 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_DESTROY, |
| 75 | &request, sizeof(request), NULL, 0); |
| 76 | } |
| 77 | |
| 78 | int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id) |
| 79 | { |
| 80 | return intf_device_id_operation(svc, intf_id, device_id); |
| 81 | } |
| 82 | EXPORT_SYMBOL_GPL(gb_svc_intf_device_id); |
| 83 | |
| 84 | int gb_svc_intf_reset(struct gb_svc *svc, u8 intf_id) |
| 85 | { |
| 86 | return intf_reset_operation(svc, intf_id); |
| 87 | } |
| 88 | EXPORT_SYMBOL_GPL(gb_svc_intf_reset); |
| 89 | |
| 90 | int gb_svc_connection_create(struct gb_svc *svc, |
| 91 | u8 intf1_id, u16 cport1_id, |
| 92 | u8 intf2_id, u16 cport2_id) |
| 93 | { |
| 94 | return connection_create_operation(svc, intf1_id, cport1_id, |
| 95 | intf2_id, cport2_id); |
| 96 | } |
| 97 | EXPORT_SYMBOL_GPL(gb_svc_connection_create); |
| 98 | |
| 99 | int gb_svc_connection_destroy(struct gb_svc *svc, |
| 100 | u8 intf1_id, u16 cport1_id, |
| 101 | u8 intf2_id, u16 cport2_id) |
| 102 | { |
| 103 | return connection_destroy_operation(svc, intf1_id, cport1_id, |
| 104 | intf2_id, cport2_id); |
| 105 | } |
| 106 | EXPORT_SYMBOL_GPL(gb_svc_connection_destroy); |
| 107 | |
| 108 | static int gb_svc_intf_hotplug_recv(struct gb_operation *op) |
| 109 | { |
| 110 | struct gb_message *request = op->request; |
| 111 | struct gb_svc_intf_hotplug_request *hotplug; |
| 112 | u8 intf_id; |
| 113 | u32 unipro_mfg_id; |
| 114 | u32 unipro_prod_id; |
| 115 | u32 ara_vend_id; |
| 116 | u32 ara_prod_id; |
| 117 | |
| 118 | if (request->payload_size < sizeof(*hotplug)) { |
| 119 | dev_err(&op->connection->dev, |
| 120 | "short hotplug request received\n"); |
| 121 | return -EINVAL; |
| 122 | } |
| 123 | hotplug = request->payload; |
| 124 | |
| 125 | /* |
| 126 | * Grab the information we need. |
| 127 | * |
| 128 | * XXX I'd really like to acknowledge receipt, and then |
| 129 | * XXX continue processing the request. There's no need |
| 130 | * XXX for the SVC to wait. In fact, it might be best to |
| 131 | * XXX have the SVC get acknowledgement before we proceed. |
| 132 | * */ |
| 133 | intf_id = hotplug->intf_id; |
| 134 | unipro_mfg_id = hotplug->data.unipro_mfg_id; |
| 135 | unipro_prod_id = hotplug->data.unipro_prod_id; |
| 136 | ara_vend_id = hotplug->data.ara_vend_id; |
| 137 | ara_prod_id = hotplug->data.ara_prod_id; |
| 138 | |
| 139 | /* FIXME Set up the interface here; may required firmware download */ |
| 140 | |
| 141 | return 0; |
| 142 | } |
| 143 | |
| 144 | static int gb_svc_intf_hot_unplug_recv(struct gb_operation *op) |
| 145 | { |
| 146 | struct gb_message *request = op->request; |
| 147 | struct gb_svc_intf_hot_unplug_request *hot_unplug; |
| 148 | u8 intf_id; |
| 149 | |
| 150 | if (request->payload_size < sizeof(*hot_unplug)) { |
| 151 | dev_err(&op->connection->dev, |
| 152 | "short hot unplug request received\n"); |
| 153 | return -EINVAL; |
| 154 | } |
| 155 | hot_unplug = request->payload; |
| 156 | |
| 157 | intf_id = hot_unplug->intf_id; |
| 158 | |
| 159 | /* FIXME Tear down the interface here */ |
| 160 | |
| 161 | return 0; |
| 162 | |
| 163 | } |
| 164 | |
| 165 | static int gb_svc_intf_reset_recv(struct gb_operation *op) |
| 166 | { |
| 167 | struct gb_message *request = op->request; |
| 168 | struct gb_svc_intf_reset_request *reset; |
| 169 | u8 intf_id; |
| 170 | |
| 171 | if (request->payload_size < sizeof(*reset)) { |
| 172 | dev_err(&op->connection->dev, |
| 173 | "short reset request received\n"); |
| 174 | return -EINVAL; |
| 175 | } |
| 176 | reset = request->payload; |
| 177 | |
| 178 | intf_id = reset->intf_id; |
| 179 | |
| 180 | /* FIXME Reset the interface here */ |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | static int gb_svc_request_recv(u8 type, struct gb_operation *op) |
| 186 | { |
| 187 | switch (type) { |
| 188 | case GB_SVC_TYPE_INTF_HOTPLUG: |
| 189 | return gb_svc_intf_hotplug_recv(op); |
| 190 | case GB_SVC_TYPE_INTF_HOT_UNPLUG: |
| 191 | return gb_svc_intf_hot_unplug_recv(op); |
| 192 | case GB_SVC_TYPE_INTF_RESET: |
| 193 | return gb_svc_intf_reset_recv(op); |
| 194 | default: |
| 195 | dev_err(&op->connection->dev, |
| 196 | "unsupported request: %hhu\n", type); |
| 197 | return -EINVAL; |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * Do initial setup of the SVC. |
| 203 | */ |
| 204 | static int gb_svc_device_setup(struct gb_svc *gb_svc) |
| 205 | { |
| 206 | /* First thing we need to do is check the version */ |
| 207 | return get_version(gb_svc); |
| 208 | } |
| 209 | |
| 210 | static int gb_svc_connection_init(struct gb_connection *connection) |
| 211 | { |
| 212 | struct gb_svc *svc; |
| 213 | int ret; |
| 214 | |
| 215 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); |
| 216 | if (!svc) |
| 217 | return -ENOMEM; |
| 218 | |
| 219 | svc->connection = connection; |
| 220 | connection->private = svc; |
| 221 | ret = gb_svc_device_setup(svc); |
| 222 | if (ret) |
| 223 | kfree(svc); |
| 224 | |
| 225 | return ret; |
| 226 | } |
| 227 | |
| 228 | static void gb_svc_connection_exit(struct gb_connection *connection) |
| 229 | { |
| 230 | struct gb_svc *svc = connection->private; |
| 231 | |
| 232 | if (!svc) |
| 233 | return; |
| 234 | |
| 235 | kfree(svc); |
| 236 | } |
| 237 | |
| 238 | static struct gb_protocol svc_protocol = { |
| 239 | .name = "svc", |
| 240 | .id = GREYBUS_PROTOCOL_SVC, |
| 241 | .major = 0, |
| 242 | .minor = 1, |
| 243 | .connection_init = gb_svc_connection_init, |
| 244 | .connection_exit = gb_svc_connection_exit, |
| 245 | .request_recv = gb_svc_request_recv, |
| 246 | }; |
| 247 | |
| 248 | int gb_svc_protocol_init(void) |
| 249 | { |
| 250 | return gb_protocol_register(&svc_protocol); |
| 251 | } |
| 252 | |
| 253 | void gb_svc_protocol_exit(void) |
| 254 | { |
| 255 | gb_protocol_deregister(&svc_protocol); |
| 256 | } |