Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Greybus "Core" |
| 3 | * |
| 4 | * Copyright 2014 Google Inc. |
| 5 | * |
| 6 | * Released under the GPLv2 only. |
| 7 | */ |
| 8 | |
| 9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 10 | |
| 11 | #include <linux/types.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/moduleparam.h> |
| 14 | #include <linux/kernel.h> |
Greg Kroah-Hartman | a239f67 | 2014-09-01 14:39:49 -0700 | [diff] [blame] | 15 | #include <linux/slab.h> |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 16 | #include <linux/device.h> |
| 17 | |
| 18 | #include "greybus.h" |
| 19 | |
| 20 | /* Allow greybus to be disabled at boot if needed */ |
| 21 | static bool nogreybus; |
| 22 | #ifdef MODULE |
| 23 | module_param(nogreybus, bool, 0444); |
| 24 | #else |
Viresh Kumar | 8597e6b | 2014-10-20 16:45:50 +0530 | [diff] [blame] | 25 | core_param(nogreybus, nogreybus, bool, 0444); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 26 | #endif |
| 27 | int greybus_disabled(void) |
| 28 | { |
| 29 | return nogreybus; |
| 30 | } |
| 31 | EXPORT_SYMBOL_GPL(greybus_disabled); |
| 32 | |
Alex Elder | 778c69c | 2014-09-22 19:19:03 -0500 | [diff] [blame] | 33 | static int greybus_module_match(struct device *dev, struct device_driver *drv) |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 34 | { |
Viresh Kumar | 95bd99d | 2014-11-14 17:24:59 +0530 | [diff] [blame] | 35 | struct greybus_driver *driver = to_greybus_driver(drv); |
Alex Elder | e1e9dbd | 2014-10-01 21:54:11 -0500 | [diff] [blame] | 36 | struct gb_module *gmod = to_gb_module(dev); |
Greg Kroah-Hartman | 6584c8a | 2014-09-01 13:31:31 -0700 | [diff] [blame] | 37 | const struct greybus_module_id *id; |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 38 | |
Alex Elder | e1e9dbd | 2014-10-01 21:54:11 -0500 | [diff] [blame] | 39 | id = gb_module_match_id(gmod, driver->id_table); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 40 | if (id) |
| 41 | return 1; |
| 42 | /* FIXME - Dyanmic ids? */ |
| 43 | return 0; |
| 44 | } |
| 45 | |
| 46 | static int greybus_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 47 | { |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 48 | struct gb_module *gmod = NULL; |
| 49 | struct gb_interface *interface = NULL; |
| 50 | struct gb_connection *connection = NULL; |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 51 | |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 52 | if (is_gb_module(dev)) { |
| 53 | gmod = to_gb_module(dev); |
| 54 | } else if (is_gb_interface(dev)) { |
| 55 | interface = to_gb_interface(dev); |
| 56 | gmod = interface->gmod; |
| 57 | } else if (is_gb_connection(dev)) { |
| 58 | connection = to_gb_connection(dev); |
| 59 | interface = connection->interface; |
| 60 | gmod = interface->gmod; |
| 61 | } else { |
| 62 | dev_WARN(dev, "uevent for unknown greybus device \"type\"!\n"); |
| 63 | return -EINVAL; |
| 64 | } |
Greg Kroah-Hartman | f0f61b9 | 2014-10-24 17:34:46 +0800 | [diff] [blame] | 65 | |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 66 | if (connection) { |
| 67 | // FIXME |
| 68 | // add a uevent that can "load" a connection type |
| 69 | return 0; |
| 70 | } |
Greg Kroah-Hartman | f0f61b9 | 2014-10-24 17:34:46 +0800 | [diff] [blame] | 71 | |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 72 | if (interface) { |
| 73 | // FIXME |
| 74 | // add a uevent that can "load" a interface type |
| 75 | // This is what we need to bind a driver to so use the info |
| 76 | // in gmod here as well |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | // FIXME |
| 81 | // "just" a module, be vague here, nothing binds to a module except |
| 82 | // the greybus core, so there's not much, if anything, we need to |
| 83 | // advertise. |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 84 | return 0; |
| 85 | } |
| 86 | |
Greg Kroah-Hartman | f0f61b9 | 2014-10-24 17:34:46 +0800 | [diff] [blame] | 87 | struct bus_type greybus_bus_type = { |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 88 | .name = "greybus", |
Alex Elder | 778c69c | 2014-09-22 19:19:03 -0500 | [diff] [blame] | 89 | .match = greybus_module_match, |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 90 | .uevent = greybus_uevent, |
| 91 | }; |
| 92 | |
| 93 | static int greybus_probe(struct device *dev) |
| 94 | { |
| 95 | struct greybus_driver *driver = to_greybus_driver(dev->driver); |
Alex Elder | e1e9dbd | 2014-10-01 21:54:11 -0500 | [diff] [blame] | 96 | struct gb_module *gmod = to_gb_module(dev); |
Greg Kroah-Hartman | 6584c8a | 2014-09-01 13:31:31 -0700 | [diff] [blame] | 97 | const struct greybus_module_id *id; |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 98 | int retval; |
| 99 | |
| 100 | /* match id */ |
Alex Elder | e1e9dbd | 2014-10-01 21:54:11 -0500 | [diff] [blame] | 101 | id = gb_module_match_id(gmod, driver->id_table); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 102 | if (!id) |
| 103 | return -ENODEV; |
| 104 | |
Alex Elder | 778c69c | 2014-09-22 19:19:03 -0500 | [diff] [blame] | 105 | retval = driver->probe(gmod, id); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 106 | if (retval) |
| 107 | return retval; |
| 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | static int greybus_remove(struct device *dev) |
| 113 | { |
| 114 | struct greybus_driver *driver = to_greybus_driver(dev->driver); |
Alex Elder | e1e9dbd | 2014-10-01 21:54:11 -0500 | [diff] [blame] | 115 | struct gb_module *gmod = to_gb_module(dev); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 116 | |
Alex Elder | 778c69c | 2014-09-22 19:19:03 -0500 | [diff] [blame] | 117 | driver->disconnect(gmod); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | int greybus_register_driver(struct greybus_driver *driver, struct module *owner, |
| 122 | const char *mod_name) |
| 123 | { |
| 124 | int retval; |
| 125 | |
| 126 | if (greybus_disabled()) |
| 127 | return -ENODEV; |
| 128 | |
| 129 | driver->driver.name = driver->name; |
| 130 | driver->driver.probe = greybus_probe; |
| 131 | driver->driver.remove = greybus_remove; |
| 132 | driver->driver.owner = owner; |
| 133 | driver->driver.mod_name = mod_name; |
| 134 | |
| 135 | retval = driver_register(&driver->driver); |
| 136 | if (retval) |
| 137 | return retval; |
| 138 | |
| 139 | pr_info("registered new driver %s\n", driver->name); |
| 140 | return 0; |
| 141 | } |
| 142 | EXPORT_SYMBOL_GPL(greybus_register_driver); |
| 143 | |
| 144 | void greybus_deregister(struct greybus_driver *driver) |
| 145 | { |
| 146 | driver_unregister(&driver->driver); |
| 147 | } |
| 148 | EXPORT_SYMBOL_GPL(greybus_deregister); |
| 149 | |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 150 | |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 151 | static DEFINE_MUTEX(hd_mutex); |
| 152 | |
| 153 | static void free_hd(struct kref *kref) |
| 154 | { |
| 155 | struct greybus_host_device *hd; |
| 156 | |
| 157 | hd = container_of(kref, struct greybus_host_device, kref); |
| 158 | |
| 159 | kfree(hd); |
Alex Elder | a06df4b | 2014-10-16 06:35:26 -0500 | [diff] [blame] | 160 | mutex_unlock(&hd_mutex); |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 161 | } |
| 162 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 163 | struct greybus_host_device *greybus_create_hd(struct greybus_host_driver *driver, |
| 164 | struct device *parent) |
| 165 | { |
| 166 | struct greybus_host_device *hd; |
| 167 | |
Greg Kroah-Hartman | 724b619 | 2014-10-27 13:32:27 +0800 | [diff] [blame] | 168 | /* |
| 169 | * Validate that the driver implements all of the callbacks |
| 170 | * so that we don't have to every time we make them. |
| 171 | */ |
| 172 | if ((!driver->alloc_gbuf_data) || |
| 173 | (!driver->free_gbuf_data) || |
| 174 | (!driver->submit_svc) || |
| 175 | (!driver->submit_gbuf) || |
Greg Kroah-Hartman | 4afbba0 | 2014-10-27 14:01:06 +0800 | [diff] [blame] | 176 | (!driver->kill_gbuf)) { |
Greg Kroah-Hartman | 724b619 | 2014-10-27 13:32:27 +0800 | [diff] [blame] | 177 | pr_err("Must implement all greybus_host_driver callbacks!\n"); |
| 178 | return NULL; |
| 179 | } |
| 180 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 181 | hd = kzalloc(sizeof(*hd) + driver->hd_priv_size, GFP_KERNEL); |
| 182 | if (!hd) |
| 183 | return NULL; |
| 184 | |
| 185 | kref_init(&hd->kref); |
Greg Kroah-Hartman | 772149b | 2014-09-14 12:27:28 -0700 | [diff] [blame] | 186 | hd->parent = parent; |
| 187 | hd->driver = driver; |
Alex Elder | e1e9dbd | 2014-10-01 21:54:11 -0500 | [diff] [blame] | 188 | INIT_LIST_HEAD(&hd->modules); |
Alex Elder | 2c43ce4 | 2014-11-17 08:08:44 -0600 | [diff] [blame^] | 189 | INIT_LIST_HEAD(&hd->connections); |
Alex Elder | 177404b | 2014-10-03 14:14:24 -0500 | [diff] [blame] | 190 | ida_init(&hd->cport_id_map); |
Greg Kroah-Hartman | 25b7b6d | 2014-10-06 20:29:40 -0700 | [diff] [blame] | 191 | spin_lock_init(&hd->cport_id_map_lock); |
Alex Elder | 1bb3c72 | 2014-10-02 12:30:03 -0500 | [diff] [blame] | 192 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 193 | return hd; |
| 194 | } |
| 195 | EXPORT_SYMBOL_GPL(greybus_create_hd); |
| 196 | |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 197 | void greybus_remove_hd(struct greybus_host_device *hd) |
| 198 | { |
Greg Kroah-Hartman | f0f61b9 | 2014-10-24 17:34:46 +0800 | [diff] [blame] | 199 | /* Tear down all modules that happen to be associated with this host |
| 200 | * controller */ |
Greg Kroah-Hartman | 63e4a8e | 2014-10-22 16:38:07 +0800 | [diff] [blame] | 201 | gb_remove_modules(hd); |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 202 | kref_put_mutex(&hd->kref, free_hd, &hd_mutex); |
| 203 | } |
| 204 | EXPORT_SYMBOL_GPL(greybus_remove_hd); |
| 205 | |
Greg Kroah-Hartman | 503c1cd | 2014-08-30 16:21:03 -0700 | [diff] [blame] | 206 | static int __init gb_init(void) |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 207 | { |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 208 | int retval; |
| 209 | |
Alex Elder | 1bb3c72 | 2014-10-02 12:30:03 -0500 | [diff] [blame] | 210 | BUILD_BUG_ON(HOST_DEV_CPORT_ID_MAX >= (long)CPORT_ID_BAD); |
Alex Elder | 1bb3c72 | 2014-10-02 12:30:03 -0500 | [diff] [blame] | 211 | |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 212 | retval = gb_debugfs_init(); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 213 | if (retval) { |
| 214 | pr_err("debugfs failed\n"); |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 215 | return retval; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 216 | } |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 217 | |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 218 | retval = bus_register(&greybus_bus_type); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 219 | if (retval) { |
| 220 | pr_err("bus_register failed\n"); |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 221 | goto error_bus; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 222 | } |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 223 | |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 224 | retval = gb_ap_init(); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 225 | if (retval) { |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 226 | pr_err("gb_ap_init failed\n"); |
| 227 | goto error_ap; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 228 | } |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 229 | |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 230 | retval = gb_gbuf_init(); |
| 231 | if (retval) { |
| 232 | pr_err("gb_gbuf_init failed\n"); |
| 233 | goto error_gbuf; |
| 234 | } |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 235 | |
Alex Elder | 2eb585f | 2014-10-16 06:35:34 -0500 | [diff] [blame] | 236 | retval = gb_operation_init(); |
| 237 | if (retval) { |
| 238 | pr_err("gb_operation_init failed\n"); |
| 239 | goto error_operation; |
| 240 | } |
| 241 | |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 242 | if (!gb_protocol_init()) { |
| 243 | /* This only fails for duplicate protocol registration */ |
| 244 | retval = -EEXIST; |
| 245 | pr_err("gb_protocol_init failed\n"); |
| 246 | goto error_protocol; |
| 247 | } |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 248 | |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 249 | return 0; /* Success */ |
| 250 | |
| 251 | error_protocol: |
| 252 | gb_operation_exit(); |
Alex Elder | 2eb585f | 2014-10-16 06:35:34 -0500 | [diff] [blame] | 253 | error_operation: |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 254 | gb_gbuf_exit(); |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 255 | error_gbuf: |
| 256 | gb_ap_exit(); |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 257 | error_ap: |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 258 | bus_unregister(&greybus_bus_type); |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 259 | error_bus: |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 260 | gb_debugfs_cleanup(); |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 261 | |
| 262 | return retval; |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 263 | } |
| 264 | |
Greg Kroah-Hartman | 503c1cd | 2014-08-30 16:21:03 -0700 | [diff] [blame] | 265 | static void __exit gb_exit(void) |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 266 | { |
Viresh Kumar | 35a52ca | 2014-11-13 18:14:33 +0530 | [diff] [blame] | 267 | gb_protocol_exit(); |
Alex Elder | 2eb585f | 2014-10-16 06:35:34 -0500 | [diff] [blame] | 268 | gb_operation_exit(); |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 269 | gb_gbuf_exit(); |
| 270 | gb_ap_exit(); |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 271 | bus_unregister(&greybus_bus_type); |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 272 | gb_debugfs_cleanup(); |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 273 | } |
| 274 | |
| 275 | module_init(gb_init); |
| 276 | module_exit(gb_exit); |
| 277 | |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 278 | MODULE_LICENSE("GPL"); |
| 279 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |