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 | |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 10 | #include <linux/workqueue.h> |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 11 | |
Viresh Kumar | f66427a | 2015-09-02 21:27:13 +0530 | [diff] [blame] | 12 | #include "greybus.h" |
| 13 | |
Johan Hovold | f6c6c13 | 2015-11-11 10:07:08 +0100 | [diff] [blame] | 14 | #define CPORT_FLAGS_E2EFC BIT(0) |
| 15 | #define CPORT_FLAGS_CSD_N BIT(1) |
| 16 | #define CPORT_FLAGS_CSV_N BIT(2) |
Perry Hung | 0b22649 | 2015-07-24 19:02:34 -0400 | [diff] [blame] | 17 | |
Viresh Kumar | b45864d | 2015-07-24 15:32:21 +0530 | [diff] [blame] | 18 | |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 19 | struct gb_svc_deferred_request { |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 20 | struct work_struct work; |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 21 | struct gb_operation *operation; |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 22 | }; |
| 23 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 24 | |
Johan Hovold | 66069fb | 2015-11-25 15:59:09 +0100 | [diff] [blame] | 25 | static ssize_t endo_id_show(struct device *dev, |
| 26 | struct device_attribute *attr, char *buf) |
| 27 | { |
| 28 | struct gb_svc *svc = to_gb_svc(dev); |
| 29 | |
| 30 | return sprintf(buf, "0x%04x\n", svc->endo_id); |
| 31 | } |
| 32 | static DEVICE_ATTR_RO(endo_id); |
| 33 | |
| 34 | static ssize_t ap_intf_id_show(struct device *dev, |
| 35 | struct device_attribute *attr, char *buf) |
| 36 | { |
| 37 | struct gb_svc *svc = to_gb_svc(dev); |
| 38 | |
| 39 | return sprintf(buf, "%u\n", svc->ap_intf_id); |
| 40 | } |
| 41 | static DEVICE_ATTR_RO(ap_intf_id); |
| 42 | |
| 43 | static struct attribute *svc_attrs[] = { |
| 44 | &dev_attr_endo_id.attr, |
| 45 | &dev_attr_ap_intf_id.attr, |
| 46 | NULL, |
| 47 | }; |
| 48 | ATTRIBUTE_GROUPS(svc); |
| 49 | |
Viresh Kumar | 505f16c | 2015-08-31 17:21:07 +0530 | [diff] [blame] | 50 | static int gb_svc_intf_device_id(struct gb_svc *svc, u8 intf_id, u8 device_id) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 51 | { |
| 52 | struct gb_svc_intf_device_id_request request; |
| 53 | |
| 54 | request.intf_id = intf_id; |
| 55 | request.device_id = device_id; |
| 56 | |
| 57 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_DEVICE_ID, |
| 58 | &request, sizeof(request), NULL, 0); |
| 59 | } |
| 60 | |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 61 | int gb_svc_intf_reset(struct gb_svc *svc, u8 intf_id) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 62 | { |
| 63 | struct gb_svc_intf_reset_request request; |
| 64 | |
| 65 | request.intf_id = intf_id; |
| 66 | |
| 67 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_INTF_RESET, |
| 68 | &request, sizeof(request), NULL, 0); |
| 69 | } |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 70 | EXPORT_SYMBOL_GPL(gb_svc_intf_reset); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 71 | |
Viresh Kumar | 19151c3 | 2015-09-09 21:08:29 +0530 | [diff] [blame] | 72 | int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector, |
| 73 | u32 *value) |
| 74 | { |
| 75 | struct gb_svc_dme_peer_get_request request; |
| 76 | struct gb_svc_dme_peer_get_response response; |
| 77 | u16 result; |
| 78 | int ret; |
| 79 | |
| 80 | request.intf_id = intf_id; |
| 81 | request.attr = cpu_to_le16(attr); |
| 82 | request.selector = cpu_to_le16(selector); |
| 83 | |
| 84 | ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_GET, |
| 85 | &request, sizeof(request), |
| 86 | &response, sizeof(response)); |
| 87 | if (ret) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 88 | dev_err(&svc->dev, "failed to get DME attribute (%u %04x %u): %d\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 89 | intf_id, attr, selector, ret); |
Viresh Kumar | 19151c3 | 2015-09-09 21:08:29 +0530 | [diff] [blame] | 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | result = le16_to_cpu(response.result_code); |
| 94 | if (result) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 95 | dev_err(&svc->dev, "UniPro error while getting DME attribute (%u %04x %u): %u\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 96 | intf_id, attr, selector, result); |
Viresh Kumar | 4aac6c5 | 2015-12-04 21:30:08 +0530 | [diff] [blame] | 97 | return -EIO; |
Viresh Kumar | 19151c3 | 2015-09-09 21:08:29 +0530 | [diff] [blame] | 98 | } |
| 99 | |
| 100 | if (value) |
| 101 | *value = le32_to_cpu(response.attr_value); |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | EXPORT_SYMBOL_GPL(gb_svc_dme_peer_get); |
| 106 | |
| 107 | int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector, |
| 108 | u32 value) |
| 109 | { |
| 110 | struct gb_svc_dme_peer_set_request request; |
| 111 | struct gb_svc_dme_peer_set_response response; |
| 112 | u16 result; |
| 113 | int ret; |
| 114 | |
| 115 | request.intf_id = intf_id; |
| 116 | request.attr = cpu_to_le16(attr); |
| 117 | request.selector = cpu_to_le16(selector); |
| 118 | request.value = cpu_to_le32(value); |
| 119 | |
| 120 | ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_DME_PEER_SET, |
| 121 | &request, sizeof(request), |
| 122 | &response, sizeof(response)); |
| 123 | if (ret) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 124 | dev_err(&svc->dev, "failed to set DME attribute (%u %04x %u %u): %d\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 125 | intf_id, attr, selector, value, ret); |
Viresh Kumar | 19151c3 | 2015-09-09 21:08:29 +0530 | [diff] [blame] | 126 | return ret; |
| 127 | } |
| 128 | |
| 129 | result = le16_to_cpu(response.result_code); |
| 130 | if (result) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 131 | dev_err(&svc->dev, "UniPro error while setting DME attribute (%u %04x %u %u): %u\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 132 | intf_id, attr, selector, value, result); |
Viresh Kumar | 4aac6c5 | 2015-12-04 21:30:08 +0530 | [diff] [blame] | 133 | return -EIO; |
Viresh Kumar | 19151c3 | 2015-09-09 21:08:29 +0530 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | EXPORT_SYMBOL_GPL(gb_svc_dme_peer_set); |
| 139 | |
Viresh Kumar | 6bec5c7 | 2015-09-24 14:40:29 -0700 | [diff] [blame] | 140 | /* |
| 141 | * T_TstSrcIncrement is written by the module on ES2 as a stand-in for boot |
| 142 | * status attribute. AP needs to read and clear it, after reading a non-zero |
| 143 | * value from it. |
| 144 | * |
| 145 | * FIXME: This is module-hardware dependent and needs to be extended for every |
| 146 | * type of module we want to support. |
| 147 | */ |
| 148 | static int gb_svc_read_and_clear_module_boot_status(struct gb_interface *intf) |
| 149 | { |
Johan Hovold | 2537636 | 2015-11-03 18:03:23 +0100 | [diff] [blame] | 150 | struct gb_host_device *hd = intf->hd; |
Viresh Kumar | 6bec5c7 | 2015-09-24 14:40:29 -0700 | [diff] [blame] | 151 | int ret; |
| 152 | u32 value; |
| 153 | |
| 154 | /* Read and clear boot status in T_TstSrcIncrement */ |
| 155 | ret = gb_svc_dme_peer_get(hd->svc, intf->interface_id, |
| 156 | DME_ATTR_T_TST_SRC_INCREMENT, |
| 157 | DME_ATTR_SELECTOR_INDEX, &value); |
| 158 | |
| 159 | if (ret) |
| 160 | return ret; |
| 161 | |
| 162 | /* |
| 163 | * A nonzero boot status indicates the module has finished |
| 164 | * booting. Clear it. |
| 165 | */ |
| 166 | if (!value) { |
| 167 | dev_err(&intf->dev, "Module not ready yet\n"); |
| 168 | return -ENODEV; |
| 169 | } |
| 170 | |
Viresh Kumar | 1575ef18 | 2015-10-07 15:40:24 -0400 | [diff] [blame] | 171 | /* |
| 172 | * Check if the module needs to boot from unipro. |
| 173 | * For ES2: We need to check lowest 8 bits of 'value'. |
| 174 | * For ES3: We need to check highest 8 bits out of 32 of 'value'. |
| 175 | * |
| 176 | * FIXME: Add code to find if we are on ES2 or ES3 to have separate |
| 177 | * checks. |
| 178 | */ |
| 179 | if (value == DME_TSI_UNIPRO_BOOT_STARTED || |
| 180 | value == DME_TSI_FALLBACK_UNIPRO_BOOT_STARTED) |
| 181 | intf->boot_over_unipro = true; |
| 182 | |
Viresh Kumar | 6bec5c7 | 2015-09-24 14:40:29 -0700 | [diff] [blame] | 183 | return gb_svc_dme_peer_set(hd->svc, intf->interface_id, |
| 184 | DME_ATTR_T_TST_SRC_INCREMENT, |
| 185 | DME_ATTR_SELECTOR_INDEX, 0); |
| 186 | } |
| 187 | |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 188 | int gb_svc_connection_create(struct gb_svc *svc, |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 189 | u8 intf1_id, u16 cport1_id, |
Viresh Kumar | 1575ef18 | 2015-10-07 15:40:24 -0400 | [diff] [blame] | 190 | u8 intf2_id, u16 cport2_id, |
| 191 | bool boot_over_unipro) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 192 | { |
| 193 | struct gb_svc_conn_create_request request; |
| 194 | |
| 195 | request.intf1_id = intf1_id; |
Rui Miguel Silva | 2498050b | 2015-09-15 15:33:51 +0100 | [diff] [blame] | 196 | request.cport1_id = cpu_to_le16(cport1_id); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 197 | request.intf2_id = intf2_id; |
Rui Miguel Silva | 2498050b | 2015-09-15 15:33:51 +0100 | [diff] [blame] | 198 | request.cport2_id = cpu_to_le16(cport2_id); |
Perry Hung | 0b22649 | 2015-07-24 19:02:34 -0400 | [diff] [blame] | 199 | /* |
| 200 | * XXX: fix connections paramaters to TC0 and all CPort flags |
| 201 | * for now. |
| 202 | */ |
| 203 | request.tc = 0; |
Viresh Kumar | 1575ef18 | 2015-10-07 15:40:24 -0400 | [diff] [blame] | 204 | |
| 205 | /* |
| 206 | * We need to skip setting E2EFC and other flags to the connection |
| 207 | * create request, for all cports, on an interface that need to boot |
| 208 | * over unipro, i.e. interfaces required to download firmware. |
| 209 | */ |
| 210 | if (boot_over_unipro) |
| 211 | request.flags = CPORT_FLAGS_CSV_N | CPORT_FLAGS_CSD_N; |
| 212 | else |
| 213 | request.flags = CPORT_FLAGS_CSV_N | CPORT_FLAGS_E2EFC; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 214 | |
| 215 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_CONN_CREATE, |
| 216 | &request, sizeof(request), NULL, 0); |
| 217 | } |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 218 | EXPORT_SYMBOL_GPL(gb_svc_connection_create); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 219 | |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 220 | void gb_svc_connection_destroy(struct gb_svc *svc, u8 intf1_id, u16 cport1_id, |
| 221 | u8 intf2_id, u16 cport2_id) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 222 | { |
| 223 | struct gb_svc_conn_destroy_request request; |
Viresh Kumar | d9fcfff | 2015-08-31 17:21:05 +0530 | [diff] [blame] | 224 | struct gb_connection *connection = svc->connection; |
| 225 | int ret; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 226 | |
| 227 | request.intf1_id = intf1_id; |
Rui Miguel Silva | 2498050b | 2015-09-15 15:33:51 +0100 | [diff] [blame] | 228 | request.cport1_id = cpu_to_le16(cport1_id); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 229 | request.intf2_id = intf2_id; |
Rui Miguel Silva | 2498050b | 2015-09-15 15:33:51 +0100 | [diff] [blame] | 230 | request.cport2_id = cpu_to_le16(cport2_id); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 231 | |
Viresh Kumar | d9fcfff | 2015-08-31 17:21:05 +0530 | [diff] [blame] | 232 | ret = gb_operation_sync(connection, GB_SVC_TYPE_CONN_DESTROY, |
| 233 | &request, sizeof(request), NULL, 0); |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 234 | if (ret) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 235 | dev_err(&svc->dev, "failed to destroy connection (%u:%u %u:%u): %d\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 236 | intf1_id, cport1_id, intf2_id, cport2_id, ret); |
| 237 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 238 | } |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 239 | EXPORT_SYMBOL_GPL(gb_svc_connection_destroy); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 240 | |
Viresh Kumar | bb10685 | 2015-09-07 16:01:25 +0530 | [diff] [blame] | 241 | /* Creates bi-directional routes between the devices */ |
Viresh Kumar | 505f16c | 2015-08-31 17:21:07 +0530 | [diff] [blame] | 242 | static int gb_svc_route_create(struct gb_svc *svc, u8 intf1_id, u8 dev1_id, |
| 243 | u8 intf2_id, u8 dev2_id) |
Perry Hung | e08aaa4 | 2015-07-24 19:02:31 -0400 | [diff] [blame] | 244 | { |
| 245 | struct gb_svc_route_create_request request; |
| 246 | |
| 247 | request.intf1_id = intf1_id; |
| 248 | request.dev1_id = dev1_id; |
| 249 | request.intf2_id = intf2_id; |
| 250 | request.dev2_id = dev2_id; |
| 251 | |
| 252 | return gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_CREATE, |
| 253 | &request, sizeof(request), NULL, 0); |
| 254 | } |
Perry Hung | e08aaa4 | 2015-07-24 19:02:31 -0400 | [diff] [blame] | 255 | |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 256 | /* Destroys bi-directional routes between the devices */ |
| 257 | static void gb_svc_route_destroy(struct gb_svc *svc, u8 intf1_id, u8 intf2_id) |
| 258 | { |
| 259 | struct gb_svc_route_destroy_request request; |
| 260 | int ret; |
| 261 | |
| 262 | request.intf1_id = intf1_id; |
| 263 | request.intf2_id = intf2_id; |
| 264 | |
| 265 | ret = gb_operation_sync(svc->connection, GB_SVC_TYPE_ROUTE_DESTROY, |
| 266 | &request, sizeof(request), NULL, 0); |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 267 | if (ret) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 268 | dev_err(&svc->dev, "failed to destroy route (%u %u): %d\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 269 | intf1_id, intf2_id, ret); |
| 270 | } |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 271 | } |
| 272 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 273 | static int gb_svc_version_request(struct gb_operation *op) |
| 274 | { |
| 275 | struct gb_connection *connection = op->connection; |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 276 | struct gb_svc *svc = connection->private; |
Johan Hovold | cfb1690 | 2015-09-15 10:48:01 +0200 | [diff] [blame] | 277 | struct gb_protocol_version_request *request; |
| 278 | struct gb_protocol_version_response *response; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 279 | |
Johan Hovold | 5551084 | 2015-11-19 18:28:01 +0100 | [diff] [blame] | 280 | if (op->request->payload_size < sizeof(*request)) { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 281 | dev_err(&svc->dev, "short version request (%zu < %zu)\n", |
Johan Hovold | 5551084 | 2015-11-19 18:28:01 +0100 | [diff] [blame] | 282 | op->request->payload_size, |
| 283 | sizeof(*request)); |
| 284 | return -EINVAL; |
| 285 | } |
| 286 | |
Johan Hovold | cfb1690 | 2015-09-15 10:48:01 +0200 | [diff] [blame] | 287 | request = op->request->payload; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 288 | |
Johan Hovold | cfb1690 | 2015-09-15 10:48:01 +0200 | [diff] [blame] | 289 | if (request->major > GB_SVC_VERSION_MAJOR) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 290 | dev_warn(&svc->dev, "unsupported major version (%u > %u)\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 291 | request->major, GB_SVC_VERSION_MAJOR); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 292 | return -ENOTSUPP; |
| 293 | } |
| 294 | |
Johan Hovold | cfb1690 | 2015-09-15 10:48:01 +0200 | [diff] [blame] | 295 | connection->module_major = request->major; |
| 296 | connection->module_minor = request->minor; |
Viresh Kumar | 3ea959e3 | 2015-08-11 07:36:14 +0530 | [diff] [blame] | 297 | |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 298 | if (!gb_operation_response_alloc(op, sizeof(*response), GFP_KERNEL)) |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 299 | return -ENOMEM; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 300 | |
Johan Hovold | cfb1690 | 2015-09-15 10:48:01 +0200 | [diff] [blame] | 301 | response = op->response->payload; |
| 302 | response->major = connection->module_major; |
| 303 | response->minor = connection->module_minor; |
Johan Hovold | 5983293 | 2015-09-15 10:48:00 +0200 | [diff] [blame] | 304 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | static int gb_svc_hello(struct gb_operation *op) |
| 309 | { |
| 310 | struct gb_connection *connection = op->connection; |
Johan Hovold | 88f7b96 | 2015-11-25 15:59:08 +0100 | [diff] [blame] | 311 | struct gb_svc *svc = connection->private; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 312 | struct gb_svc_hello_request *hello_request; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 313 | int ret; |
| 314 | |
Viresh Kumar | 0c32d2a | 2015-08-11 07:29:19 +0530 | [diff] [blame] | 315 | if (op->request->payload_size < sizeof(*hello_request)) { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 316 | dev_warn(&svc->dev, "short hello request (%zu < %zu)\n", |
| 317 | op->request->payload_size, |
| 318 | sizeof(*hello_request)); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 319 | return -EINVAL; |
| 320 | } |
| 321 | |
| 322 | hello_request = op->request->payload; |
Johan Hovold | 66069fb | 2015-11-25 15:59:09 +0100 | [diff] [blame] | 323 | svc->endo_id = le16_to_cpu(hello_request->endo_id); |
| 324 | svc->ap_intf_id = hello_request->interface_id; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 325 | |
Johan Hovold | 88f7b96 | 2015-11-25 15:59:08 +0100 | [diff] [blame] | 326 | ret = device_add(&svc->dev); |
| 327 | if (ret) { |
| 328 | dev_err(&svc->dev, "failed to register svc device: %d\n", ret); |
| 329 | return ret; |
| 330 | } |
| 331 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 332 | return 0; |
| 333 | } |
| 334 | |
Johan Hovold | b4ee82e | 2015-12-02 18:23:28 +0100 | [diff] [blame] | 335 | static void gb_svc_intf_remove(struct gb_svc *svc, struct gb_interface *intf) |
Viresh Kumar | bbaca71 | 2015-09-23 16:48:08 -0700 | [diff] [blame] | 336 | { |
Viresh Kumar | bbaca71 | 2015-09-23 16:48:08 -0700 | [diff] [blame] | 337 | u8 intf_id = intf->interface_id; |
| 338 | u8 device_id; |
| 339 | |
| 340 | device_id = intf->device_id; |
Viresh Kumar | 80d1ede | 2015-09-23 16:48:10 -0700 | [diff] [blame] | 341 | gb_interface_remove(intf); |
Viresh Kumar | bbaca71 | 2015-09-23 16:48:08 -0700 | [diff] [blame] | 342 | |
| 343 | /* |
| 344 | * Destroy the two-way route between the AP and the interface. |
| 345 | */ |
Johan Hovold | 66069fb | 2015-11-25 15:59:09 +0100 | [diff] [blame] | 346 | gb_svc_route_destroy(svc, svc->ap_intf_id, intf_id); |
Viresh Kumar | bbaca71 | 2015-09-23 16:48:08 -0700 | [diff] [blame] | 347 | |
| 348 | ida_simple_remove(&svc->device_id_map, device_id); |
| 349 | } |
| 350 | |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 351 | static void gb_svc_process_intf_hotplug(struct gb_operation *operation) |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 352 | { |
Johan Hovold | 24456a09 | 2015-12-02 18:23:27 +0100 | [diff] [blame] | 353 | struct gb_svc_intf_hotplug_request *request; |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 354 | struct gb_connection *connection = operation->connection; |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 355 | struct gb_svc *svc = connection->private; |
Johan Hovold | 2537636 | 2015-11-03 18:03:23 +0100 | [diff] [blame] | 356 | struct gb_host_device *hd = connection->hd; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 357 | struct gb_interface *intf; |
| 358 | u8 intf_id, device_id; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 359 | int ret; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 360 | |
Johan Hovold | 24456a09 | 2015-12-02 18:23:27 +0100 | [diff] [blame] | 361 | /* The request message size has already been verified. */ |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 362 | request = operation->request->payload; |
Johan Hovold | 24456a09 | 2015-12-02 18:23:27 +0100 | [diff] [blame] | 363 | intf_id = request->intf_id; |
| 364 | |
| 365 | dev_dbg(&svc->dev, "%s - id = %u\n", __func__, intf_id); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 366 | |
Viresh Kumar | bbaca71 | 2015-09-23 16:48:08 -0700 | [diff] [blame] | 367 | intf = gb_interface_find(hd, intf_id); |
| 368 | if (intf) { |
| 369 | /* |
| 370 | * We have received a hotplug request for an interface that |
| 371 | * already exists. |
| 372 | * |
| 373 | * This can happen in cases like: |
| 374 | * - bootrom loading the firmware image and booting into that, |
| 375 | * which only generates a hotplug event. i.e. no hot-unplug |
| 376 | * event. |
| 377 | * - Or the firmware on the module crashed and sent hotplug |
| 378 | * request again to the SVC, which got propagated to AP. |
| 379 | * |
| 380 | * Remove the interface and add it again, and let user know |
| 381 | * about this with a print message. |
| 382 | */ |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 383 | dev_info(&svc->dev, "removing interface %u to add it again\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 384 | intf_id); |
Johan Hovold | b4ee82e | 2015-12-02 18:23:28 +0100 | [diff] [blame] | 385 | gb_svc_intf_remove(svc, intf); |
Viresh Kumar | bbaca71 | 2015-09-23 16:48:08 -0700 | [diff] [blame] | 386 | } |
| 387 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 388 | intf = gb_interface_create(hd, intf_id); |
| 389 | if (!intf) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 390 | dev_err(&svc->dev, "failed to create interface %u\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 391 | intf_id); |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 392 | return; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 393 | } |
| 394 | |
Viresh Kumar | 6bec5c7 | 2015-09-24 14:40:29 -0700 | [diff] [blame] | 395 | ret = gb_svc_read_and_clear_module_boot_status(intf); |
| 396 | if (ret) |
| 397 | goto destroy_interface; |
| 398 | |
Johan Hovold | 24456a09 | 2015-12-02 18:23:27 +0100 | [diff] [blame] | 399 | intf->unipro_mfg_id = le32_to_cpu(request->data.unipro_mfg_id); |
| 400 | intf->unipro_prod_id = le32_to_cpu(request->data.unipro_prod_id); |
| 401 | intf->vendor_id = le32_to_cpu(request->data.ara_vend_id); |
| 402 | intf->product_id = le32_to_cpu(request->data.ara_prod_id); |
Viresh Kumar | 3944a45 | 2015-08-12 09:19:31 +0530 | [diff] [blame] | 403 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 404 | /* |
| 405 | * Create a device id for the interface: |
| 406 | * - device id 0 (GB_DEVICE_ID_SVC) belongs to the SVC |
| 407 | * - device id 1 (GB_DEVICE_ID_AP) belongs to the AP |
| 408 | * |
| 409 | * XXX Do we need to allocate device ID for SVC or the AP here? And what |
| 410 | * XXX about an AP with multiple interface blocks? |
| 411 | */ |
Johan Hovold | c09db18 | 2015-09-15 09:18:08 +0200 | [diff] [blame] | 412 | device_id = ida_simple_get(&svc->device_id_map, |
Johan Hovold | 89f637f | 2015-09-01 12:25:25 +0200 | [diff] [blame] | 413 | GB_DEVICE_ID_MODULES_START, 0, GFP_KERNEL); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 414 | if (device_id < 0) { |
| 415 | ret = device_id; |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 416 | dev_err(&svc->dev, "failed to allocate device id for interface %u: %d\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 417 | intf_id, ret); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 418 | goto destroy_interface; |
| 419 | } |
| 420 | |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 421 | ret = gb_svc_intf_device_id(svc, intf_id, device_id); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 422 | if (ret) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 423 | dev_err(&svc->dev, "failed to set device id %u for interface %u: %d\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 424 | device_id, intf_id, ret); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 425 | goto ida_put; |
| 426 | } |
| 427 | |
Perry Hung | 7e27546 | 2015-07-24 19:02:32 -0400 | [diff] [blame] | 428 | /* |
| 429 | * Create a two-way route between the AP and the new interface |
| 430 | */ |
Johan Hovold | 66069fb | 2015-11-25 15:59:09 +0100 | [diff] [blame] | 431 | ret = gb_svc_route_create(svc, svc->ap_intf_id, GB_DEVICE_ID_AP, |
Viresh Kumar | 3f0e918 | 2015-08-31 17:21:06 +0530 | [diff] [blame] | 432 | intf_id, device_id); |
Perry Hung | 7e27546 | 2015-07-24 19:02:32 -0400 | [diff] [blame] | 433 | if (ret) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 434 | dev_err(&svc->dev, "failed to create route to interface %u (device id %u): %d\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 435 | intf_id, device_id, ret); |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 436 | goto svc_id_free; |
Perry Hung | 7e27546 | 2015-07-24 19:02:32 -0400 | [diff] [blame] | 437 | } |
| 438 | |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 439 | ret = gb_interface_init(intf, device_id); |
| 440 | if (ret) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 441 | dev_err(&svc->dev, "failed to initialize interface %u (device id %u): %d\n", |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 442 | intf_id, device_id, ret); |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 443 | goto destroy_route; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 444 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 445 | |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 446 | return; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 447 | |
Viresh Kumar | 0a02057 | 2015-09-07 18:05:26 +0530 | [diff] [blame] | 448 | destroy_route: |
Johan Hovold | 66069fb | 2015-11-25 15:59:09 +0100 | [diff] [blame] | 449 | gb_svc_route_destroy(svc, svc->ap_intf_id, intf_id); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 450 | svc_id_free: |
| 451 | /* |
| 452 | * XXX Should we tell SVC that this id doesn't belong to interface |
| 453 | * XXX anymore. |
| 454 | */ |
| 455 | ida_put: |
Johan Hovold | c09db18 | 2015-09-15 09:18:08 +0200 | [diff] [blame] | 456 | ida_simple_remove(&svc->device_id_map, device_id); |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 457 | destroy_interface: |
Viresh Kumar | 80d1ede | 2015-09-23 16:48:10 -0700 | [diff] [blame] | 458 | gb_interface_remove(intf); |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 459 | } |
| 460 | |
Johan Hovold | 57ccd4b | 2015-12-02 18:23:30 +0100 | [diff] [blame] | 461 | static void gb_svc_process_intf_hot_unplug(struct gb_operation *operation) |
| 462 | { |
| 463 | struct gb_svc *svc = operation->connection->private; |
| 464 | struct gb_svc_intf_hot_unplug_request *request; |
| 465 | struct gb_host_device *hd = operation->connection->hd; |
| 466 | struct gb_interface *intf; |
| 467 | u8 intf_id; |
| 468 | |
| 469 | /* The request message size has already been verified. */ |
| 470 | request = operation->request->payload; |
| 471 | intf_id = request->intf_id; |
| 472 | |
| 473 | dev_dbg(&svc->dev, "%s - id = %u\n", __func__, intf_id); |
| 474 | |
| 475 | intf = gb_interface_find(hd, intf_id); |
| 476 | if (!intf) { |
Viresh Kumar | 2f3db92 | 2015-12-04 21:30:09 +0530 | [diff] [blame^] | 477 | dev_warn(&svc->dev, "could not find hot-unplug interface %u\n", |
Johan Hovold | 57ccd4b | 2015-12-02 18:23:30 +0100 | [diff] [blame] | 478 | intf_id); |
| 479 | return; |
| 480 | } |
| 481 | |
| 482 | gb_svc_intf_remove(svc, intf); |
| 483 | } |
| 484 | |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 485 | static void gb_svc_process_deferred_request(struct work_struct *work) |
| 486 | { |
| 487 | struct gb_svc_deferred_request *dr; |
| 488 | struct gb_operation *operation; |
| 489 | struct gb_svc *svc; |
| 490 | u8 type; |
| 491 | |
| 492 | dr = container_of(work, struct gb_svc_deferred_request, work); |
| 493 | operation = dr->operation; |
| 494 | svc = operation->connection->private; |
| 495 | type = operation->request->header->type; |
| 496 | |
| 497 | switch (type) { |
| 498 | case GB_SVC_TYPE_INTF_HOTPLUG: |
| 499 | gb_svc_process_intf_hotplug(operation); |
| 500 | break; |
Johan Hovold | 57ccd4b | 2015-12-02 18:23:30 +0100 | [diff] [blame] | 501 | case GB_SVC_TYPE_INTF_HOT_UNPLUG: |
| 502 | gb_svc_process_intf_hot_unplug(operation); |
| 503 | break; |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 504 | default: |
| 505 | dev_err(&svc->dev, "bad deferred request type: %02x\n", type); |
| 506 | } |
| 507 | |
| 508 | gb_operation_put(operation); |
| 509 | kfree(dr); |
| 510 | } |
| 511 | |
| 512 | static int gb_svc_queue_deferred_request(struct gb_operation *operation) |
| 513 | { |
Johan Hovold | 3e48aca | 2015-12-02 18:23:31 +0100 | [diff] [blame] | 514 | struct gb_svc *svc = operation->connection->private; |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 515 | struct gb_svc_deferred_request *dr; |
| 516 | |
| 517 | dr = kmalloc(sizeof(*dr), GFP_KERNEL); |
| 518 | if (!dr) |
| 519 | return -ENOMEM; |
| 520 | |
| 521 | gb_operation_get(operation); |
| 522 | |
| 523 | dr->operation = operation; |
| 524 | INIT_WORK(&dr->work, gb_svc_process_deferred_request); |
| 525 | |
Johan Hovold | 3e48aca | 2015-12-02 18:23:31 +0100 | [diff] [blame] | 526 | queue_work(svc->wq, &dr->work); |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 527 | |
| 528 | return 0; |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 529 | } |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 530 | |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 531 | /* |
| 532 | * Bringing up a module can be time consuming, as that may require lots of |
| 533 | * initialization on the module side. Over that, we may also need to download |
| 534 | * the firmware first and flash that on the module. |
| 535 | * |
Johan Hovold | 3e48aca | 2015-12-02 18:23:31 +0100 | [diff] [blame] | 536 | * In order not to make other svc events wait for all this to finish, |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 537 | * handle most of module hotplug stuff outside of the hotplug callback, with |
| 538 | * help of a workqueue. |
| 539 | */ |
| 540 | static int gb_svc_intf_hotplug_recv(struct gb_operation *op) |
| 541 | { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 542 | struct gb_svc *svc = op->connection->private; |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 543 | struct gb_svc_intf_hotplug_request *request; |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 544 | |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 545 | if (op->request->payload_size < sizeof(*request)) { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 546 | dev_warn(&svc->dev, "short hotplug request received (%zu < %zu)\n", |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 547 | op->request->payload_size, sizeof(*request)); |
Viresh Kumar | 067906f | 2015-08-06 12:44:55 +0530 | [diff] [blame] | 548 | return -EINVAL; |
| 549 | } |
| 550 | |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 551 | request = op->request->payload; |
| 552 | |
| 553 | dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id); |
| 554 | |
Johan Hovold | 9ae4109 | 2015-12-02 18:23:29 +0100 | [diff] [blame] | 555 | return gb_svc_queue_deferred_request(op); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 556 | } |
| 557 | |
| 558 | static int gb_svc_intf_hot_unplug_recv(struct gb_operation *op) |
| 559 | { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 560 | struct gb_svc *svc = op->connection->private; |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 561 | struct gb_svc_intf_hot_unplug_request *request; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 562 | |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 563 | if (op->request->payload_size < sizeof(*request)) { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 564 | dev_warn(&svc->dev, "short hot unplug request received (%zu < %zu)\n", |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 565 | op->request->payload_size, sizeof(*request)); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 566 | return -EINVAL; |
| 567 | } |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 568 | |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 569 | request = op->request->payload; |
Johan Hovold | d34a364 | 2015-12-02 18:23:26 +0100 | [diff] [blame] | 570 | |
Johan Hovold | 57ccd4b | 2015-12-02 18:23:30 +0100 | [diff] [blame] | 571 | dev_dbg(&svc->dev, "%s - id = %u\n", __func__, request->intf_id); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 572 | |
Johan Hovold | 57ccd4b | 2015-12-02 18:23:30 +0100 | [diff] [blame] | 573 | return gb_svc_queue_deferred_request(op); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 574 | } |
| 575 | |
| 576 | static int gb_svc_intf_reset_recv(struct gb_operation *op) |
| 577 | { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 578 | struct gb_svc *svc = op->connection->private; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 579 | struct gb_message *request = op->request; |
| 580 | struct gb_svc_intf_reset_request *reset; |
| 581 | u8 intf_id; |
| 582 | |
| 583 | if (request->payload_size < sizeof(*reset)) { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 584 | dev_warn(&svc->dev, "short reset request received (%zu < %zu)\n", |
| 585 | request->payload_size, sizeof(*reset)); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 586 | return -EINVAL; |
| 587 | } |
| 588 | reset = request->payload; |
| 589 | |
| 590 | intf_id = reset->intf_id; |
| 591 | |
| 592 | /* FIXME Reset the interface here */ |
| 593 | |
| 594 | return 0; |
| 595 | } |
| 596 | |
| 597 | static int gb_svc_request_recv(u8 type, struct gb_operation *op) |
| 598 | { |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 599 | struct gb_connection *connection = op->connection; |
| 600 | struct gb_svc *svc = connection->private; |
| 601 | int ret = 0; |
| 602 | |
| 603 | /* |
| 604 | * SVC requests need to follow a specific order (at least initially) and |
| 605 | * below code takes care of enforcing that. The expected order is: |
| 606 | * - PROTOCOL_VERSION |
| 607 | * - SVC_HELLO |
| 608 | * - Any other request, but the earlier two. |
| 609 | * |
| 610 | * Incoming requests are guaranteed to be serialized and so we don't |
| 611 | * need to protect 'state' for any races. |
| 612 | */ |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 613 | switch (type) { |
Viresh Kumar | 0e2462d | 2015-08-14 07:57:38 +0530 | [diff] [blame] | 614 | case GB_REQUEST_TYPE_PROTOCOL_VERSION: |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 615 | if (svc->state != GB_SVC_STATE_RESET) |
| 616 | ret = -EINVAL; |
| 617 | break; |
Viresh Kumar | ead3546 | 2015-07-21 17:44:19 +0530 | [diff] [blame] | 618 | case GB_SVC_TYPE_SVC_HELLO: |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 619 | if (svc->state != GB_SVC_STATE_PROTOCOL_VERSION) |
| 620 | ret = -EINVAL; |
| 621 | break; |
| 622 | default: |
| 623 | if (svc->state != GB_SVC_STATE_SVC_HELLO) |
| 624 | ret = -EINVAL; |
| 625 | break; |
| 626 | } |
| 627 | |
| 628 | if (ret) { |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 629 | dev_warn(&svc->dev, "unexpected request 0x%02x received (state %u)\n", |
| 630 | type, svc->state); |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 631 | return ret; |
| 632 | } |
| 633 | |
| 634 | switch (type) { |
| 635 | case GB_REQUEST_TYPE_PROTOCOL_VERSION: |
| 636 | ret = gb_svc_version_request(op); |
| 637 | if (!ret) |
| 638 | svc->state = GB_SVC_STATE_PROTOCOL_VERSION; |
| 639 | return ret; |
| 640 | case GB_SVC_TYPE_SVC_HELLO: |
| 641 | ret = gb_svc_hello(op); |
| 642 | if (!ret) |
| 643 | svc->state = GB_SVC_STATE_SVC_HELLO; |
| 644 | return ret; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 645 | case GB_SVC_TYPE_INTF_HOTPLUG: |
| 646 | return gb_svc_intf_hotplug_recv(op); |
| 647 | case GB_SVC_TYPE_INTF_HOT_UNPLUG: |
| 648 | return gb_svc_intf_hot_unplug_recv(op); |
| 649 | case GB_SVC_TYPE_INTF_RESET: |
| 650 | return gb_svc_intf_reset_recv(op); |
| 651 | default: |
Johan Hovold | 684156a | 2015-11-25 15:59:19 +0100 | [diff] [blame] | 652 | dev_warn(&svc->dev, "unsupported request 0x%02x\n", type); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 653 | return -EINVAL; |
| 654 | } |
| 655 | } |
| 656 | |
Johan Hovold | efe6ef7 | 2015-11-25 15:59:06 +0100 | [diff] [blame] | 657 | static void gb_svc_release(struct device *dev) |
| 658 | { |
Johan Hovold | 88f7b96 | 2015-11-25 15:59:08 +0100 | [diff] [blame] | 659 | struct gb_svc *svc = to_gb_svc(dev); |
Johan Hovold | efe6ef7 | 2015-11-25 15:59:06 +0100 | [diff] [blame] | 660 | |
| 661 | ida_destroy(&svc->device_id_map); |
Johan Hovold | 3e48aca | 2015-12-02 18:23:31 +0100 | [diff] [blame] | 662 | destroy_workqueue(svc->wq); |
Johan Hovold | efe6ef7 | 2015-11-25 15:59:06 +0100 | [diff] [blame] | 663 | kfree(svc); |
| 664 | } |
| 665 | |
| 666 | struct device_type greybus_svc_type = { |
| 667 | .name = "greybus_svc", |
| 668 | .release = gb_svc_release, |
| 669 | }; |
| 670 | |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 671 | static int gb_svc_connection_init(struct gb_connection *connection) |
| 672 | { |
Johan Hovold | efe6ef7 | 2015-11-25 15:59:06 +0100 | [diff] [blame] | 673 | struct gb_host_device *hd = connection->hd; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 674 | struct gb_svc *svc; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 675 | |
| 676 | svc = kzalloc(sizeof(*svc), GFP_KERNEL); |
| 677 | if (!svc) |
| 678 | return -ENOMEM; |
| 679 | |
Johan Hovold | 3e48aca | 2015-12-02 18:23:31 +0100 | [diff] [blame] | 680 | svc->wq = alloc_workqueue("%s:svc", WQ_UNBOUND, 1, dev_name(&hd->dev)); |
| 681 | if (!svc->wq) { |
| 682 | kfree(svc); |
| 683 | return -ENOMEM; |
| 684 | } |
| 685 | |
Johan Hovold | efe6ef7 | 2015-11-25 15:59:06 +0100 | [diff] [blame] | 686 | svc->dev.parent = &hd->dev; |
| 687 | svc->dev.bus = &greybus_bus_type; |
| 688 | svc->dev.type = &greybus_svc_type; |
Johan Hovold | 66069fb | 2015-11-25 15:59:09 +0100 | [diff] [blame] | 689 | svc->dev.groups = svc_groups; |
Johan Hovold | efe6ef7 | 2015-11-25 15:59:06 +0100 | [diff] [blame] | 690 | svc->dev.dma_mask = svc->dev.parent->dma_mask; |
| 691 | device_initialize(&svc->dev); |
| 692 | |
| 693 | dev_set_name(&svc->dev, "%d-svc", hd->bus_id); |
| 694 | |
Johan Hovold | 6106e51 | 2015-11-25 15:59:07 +0100 | [diff] [blame] | 695 | ida_init(&svc->device_id_map); |
Viresh Kumar | 3ccb160 | 2015-09-03 15:42:22 +0530 | [diff] [blame] | 696 | svc->state = GB_SVC_STATE_RESET; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 697 | svc->connection = connection; |
Johan Hovold | f0960d0 | 2015-12-03 19:18:02 +0100 | [diff] [blame] | 698 | svc->hd = hd; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 699 | connection->private = svc; |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 700 | |
Johan Hovold | efe6ef7 | 2015-11-25 15:59:06 +0100 | [diff] [blame] | 701 | hd->svc = svc; |
| 702 | |
Viresh Kumar | 18d777c | 2015-07-21 17:44:20 +0530 | [diff] [blame] | 703 | return 0; |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | static void gb_svc_connection_exit(struct gb_connection *connection) |
| 707 | { |
| 708 | struct gb_svc *svc = connection->private; |
| 709 | |
Johan Hovold | 88f7b96 | 2015-11-25 15:59:08 +0100 | [diff] [blame] | 710 | if (device_is_registered(&svc->dev)) |
| 711 | device_del(&svc->dev); |
| 712 | |
Johan Hovold | 1cacb45 | 2015-12-03 17:29:00 +0100 | [diff] [blame] | 713 | flush_workqueue(svc->wq); |
| 714 | |
Perry Hung | 75a60ed | 2015-07-24 19:02:33 -0400 | [diff] [blame] | 715 | connection->hd->svc = NULL; |
Viresh Kumar | d3d4484 | 2015-07-21 17:44:18 +0530 | [diff] [blame] | 716 | connection->private = NULL; |
Johan Hovold | efe6ef7 | 2015-11-25 15:59:06 +0100 | [diff] [blame] | 717 | |
| 718 | put_device(&svc->dev); |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 719 | } |
| 720 | |
| 721 | static struct gb_protocol svc_protocol = { |
| 722 | .name = "svc", |
| 723 | .id = GREYBUS_PROTOCOL_SVC, |
Viresh Kumar | 06e305f | 2015-07-01 12:13:51 +0530 | [diff] [blame] | 724 | .major = GB_SVC_VERSION_MAJOR, |
| 725 | .minor = GB_SVC_VERSION_MINOR, |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 726 | .connection_init = gb_svc_connection_init, |
| 727 | .connection_exit = gb_svc_connection_exit, |
| 728 | .request_recv = gb_svc_request_recv, |
Viresh Kumar | 5a5296b | 2015-09-07 16:01:24 +0530 | [diff] [blame] | 729 | .flags = GB_PROTOCOL_SKIP_CONTROL_CONNECTED | |
| 730 | GB_PROTOCOL_SKIP_CONTROL_DISCONNECTED | |
Johan Hovold | 4ec1574 | 2015-11-25 15:59:13 +0100 | [diff] [blame] | 731 | GB_PROTOCOL_SKIP_VERSION, |
Alex Elder | 30c6d9d | 2015-05-22 13:02:08 -0500 | [diff] [blame] | 732 | }; |
Viresh Kumar | ab69c4c | 2015-07-03 17:00:29 +0530 | [diff] [blame] | 733 | gb_builtin_protocol_driver(svc_protocol); |