Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Greybus "Core" |
| 3 | * |
| 4 | * Copyright 2014 Google Inc. |
Alex Elder | a46e967 | 2014-12-12 12:08:42 -0600 | [diff] [blame] | 5 | * Copyright 2014 Linaro Ltd. |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 6 | * |
| 7 | * Released under the GPLv2 only. |
| 8 | */ |
| 9 | |
| 10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 11 | |
| 12 | #include <linux/types.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/kernel.h> |
Greg Kroah-Hartman | a239f67 | 2014-09-01 14:39:49 -0700 | [diff] [blame] | 16 | #include <linux/slab.h> |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 17 | #include <linux/device.h> |
| 18 | |
| 19 | #include "greybus.h" |
| 20 | |
| 21 | /* Allow greybus to be disabled at boot if needed */ |
| 22 | static bool nogreybus; |
| 23 | #ifdef MODULE |
| 24 | module_param(nogreybus, bool, 0444); |
| 25 | #else |
Viresh Kumar | 8597e6b | 2014-10-20 16:45:50 +0530 | [diff] [blame] | 26 | core_param(nogreybus, nogreybus, bool, 0444); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 27 | #endif |
| 28 | int greybus_disabled(void) |
| 29 | { |
| 30 | return nogreybus; |
| 31 | } |
| 32 | EXPORT_SYMBOL_GPL(greybus_disabled); |
| 33 | |
Alex Elder | 778c69c | 2014-09-22 19:19:03 -0500 | [diff] [blame] | 34 | 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] | 35 | { |
Viresh Kumar | 95bd99d | 2014-11-14 17:24:59 +0530 | [diff] [blame] | 36 | struct greybus_driver *driver = to_greybus_driver(drv); |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 37 | struct gb_interface *intf = to_gb_interface(dev); |
Greg Kroah-Hartman | edb0e0b | 2014-12-19 14:56:32 -0800 | [diff] [blame] | 38 | const struct greybus_interface_id *id; |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 39 | |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 40 | id = gb_interface_match_id(intf, driver->id_table); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 41 | if (id) |
| 42 | return 1; |
Viresh Kumar | 696e0cc | 2014-11-21 11:26:30 +0530 | [diff] [blame] | 43 | /* FIXME - Dynamic ids? */ |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 44 | return 0; |
| 45 | } |
| 46 | |
| 47 | static int greybus_uevent(struct device *dev, struct kobj_uevent_env *env) |
| 48 | { |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 49 | struct gb_interface *intf = NULL; |
Greg Kroah-Hartman | 1db0a5f | 2014-12-12 17:10:17 -0500 | [diff] [blame] | 50 | struct gb_bundle *bundle = NULL; |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 51 | struct gb_connection *connection = NULL; |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 52 | |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 53 | if (is_gb_interface(dev)) { |
| 54 | intf = to_gb_interface(dev); |
Greg Kroah-Hartman | 1db0a5f | 2014-12-12 17:10:17 -0500 | [diff] [blame] | 55 | } else if (is_gb_bundle(dev)) { |
| 56 | bundle = to_gb_bundle(dev); |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 57 | intf = bundle->intf; |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 58 | } else if (is_gb_connection(dev)) { |
| 59 | connection = to_gb_connection(dev); |
Greg Kroah-Hartman | 1db0a5f | 2014-12-12 17:10:17 -0500 | [diff] [blame] | 60 | bundle = connection->bundle; |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 61 | intf = bundle->intf; |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 62 | } else { |
| 63 | dev_WARN(dev, "uevent for unknown greybus device \"type\"!\n"); |
| 64 | return -EINVAL; |
| 65 | } |
Greg Kroah-Hartman | f0f61b9 | 2014-10-24 17:34:46 +0800 | [diff] [blame] | 66 | |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 67 | if (connection) { |
| 68 | // FIXME |
| 69 | // add a uevent that can "load" a connection type |
| 70 | return 0; |
| 71 | } |
Greg Kroah-Hartman | f0f61b9 | 2014-10-24 17:34:46 +0800 | [diff] [blame] | 72 | |
Greg Kroah-Hartman | 1db0a5f | 2014-12-12 17:10:17 -0500 | [diff] [blame] | 73 | if (bundle) { |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 74 | // FIXME |
Greg Kroah-Hartman | 1db0a5f | 2014-12-12 17:10:17 -0500 | [diff] [blame] | 75 | // add a uevent that can "load" a bundle type |
Greg Kroah-Hartman | 0ac5a83 | 2014-11-15 12:12:16 -0800 | [diff] [blame] | 76 | // This is what we need to bind a driver to so use the info |
| 77 | // in gmod here as well |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | // FIXME |
| 82 | // "just" a module, be vague here, nothing binds to a module except |
| 83 | // the greybus core, so there's not much, if anything, we need to |
| 84 | // advertise. |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 85 | return 0; |
| 86 | } |
| 87 | |
Greg Kroah-Hartman | f0f61b9 | 2014-10-24 17:34:46 +0800 | [diff] [blame] | 88 | struct bus_type greybus_bus_type = { |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 89 | .name = "greybus", |
Alex Elder | 778c69c | 2014-09-22 19:19:03 -0500 | [diff] [blame] | 90 | .match = greybus_module_match, |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 91 | .uevent = greybus_uevent, |
| 92 | }; |
| 93 | |
| 94 | static int greybus_probe(struct device *dev) |
| 95 | { |
| 96 | struct greybus_driver *driver = to_greybus_driver(dev->driver); |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 97 | struct gb_interface *intf = to_gb_interface(dev); |
Greg Kroah-Hartman | edb0e0b | 2014-12-19 14:56:32 -0800 | [diff] [blame] | 98 | const struct greybus_interface_id *id; |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 99 | int retval; |
| 100 | |
| 101 | /* match id */ |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 102 | id = gb_interface_match_id(intf, driver->id_table); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 103 | if (!id) |
| 104 | return -ENODEV; |
| 105 | |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 106 | retval = driver->probe(intf, id); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 107 | if (retval) |
| 108 | return retval; |
| 109 | |
| 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | static int greybus_remove(struct device *dev) |
| 114 | { |
| 115 | struct greybus_driver *driver = to_greybus_driver(dev->driver); |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 116 | struct gb_interface *intf = to_gb_interface(dev); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 117 | |
Greg Kroah-Hartman | 4ab9b3c | 2014-12-19 14:56:31 -0800 | [diff] [blame] | 118 | driver->disconnect(intf); |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | int greybus_register_driver(struct greybus_driver *driver, struct module *owner, |
| 123 | const char *mod_name) |
| 124 | { |
| 125 | int retval; |
| 126 | |
| 127 | if (greybus_disabled()) |
| 128 | return -ENODEV; |
| 129 | |
| 130 | driver->driver.name = driver->name; |
| 131 | driver->driver.probe = greybus_probe; |
| 132 | driver->driver.remove = greybus_remove; |
| 133 | driver->driver.owner = owner; |
| 134 | driver->driver.mod_name = mod_name; |
| 135 | |
| 136 | retval = driver_register(&driver->driver); |
| 137 | if (retval) |
| 138 | return retval; |
| 139 | |
| 140 | pr_info("registered new driver %s\n", driver->name); |
| 141 | return 0; |
| 142 | } |
| 143 | EXPORT_SYMBOL_GPL(greybus_register_driver); |
| 144 | |
| 145 | void greybus_deregister(struct greybus_driver *driver) |
| 146 | { |
| 147 | driver_unregister(&driver->driver); |
| 148 | } |
| 149 | EXPORT_SYMBOL_GPL(greybus_deregister); |
| 150 | |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 151 | |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 152 | static DEFINE_MUTEX(hd_mutex); |
| 153 | |
| 154 | static void free_hd(struct kref *kref) |
| 155 | { |
| 156 | struct greybus_host_device *hd; |
| 157 | |
| 158 | hd = container_of(kref, struct greybus_host_device, kref); |
| 159 | |
| 160 | kfree(hd); |
Alex Elder | a06df4b | 2014-10-16 06:35:26 -0500 | [diff] [blame] | 161 | mutex_unlock(&hd_mutex); |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 164 | struct greybus_host_device *greybus_create_hd(struct greybus_host_driver *driver, |
| 165 | struct device *parent) |
| 166 | { |
| 167 | struct greybus_host_device *hd; |
| 168 | |
Greg Kroah-Hartman | 724b619 | 2014-10-27 13:32:27 +0800 | [diff] [blame] | 169 | /* |
| 170 | * Validate that the driver implements all of the callbacks |
| 171 | * so that we don't have to every time we make them. |
| 172 | */ |
Alex Elder | 8b33730 | 2014-11-20 16:09:13 -0600 | [diff] [blame] | 173 | if ((!driver->buffer_send) || (!driver->buffer_cancel) || |
Alex Elder | a9163b2 | 2014-11-18 13:26:44 -0600 | [diff] [blame] | 174 | (!driver->submit_svc)) { |
Greg Kroah-Hartman | 724b619 | 2014-10-27 13:32:27 +0800 | [diff] [blame] | 175 | pr_err("Must implement all greybus_host_driver callbacks!\n"); |
| 176 | return NULL; |
| 177 | } |
| 178 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 179 | hd = kzalloc(sizeof(*hd) + driver->hd_priv_size, GFP_KERNEL); |
| 180 | if (!hd) |
| 181 | return NULL; |
| 182 | |
| 183 | kref_init(&hd->kref); |
Greg Kroah-Hartman | 772149b | 2014-09-14 12:27:28 -0700 | [diff] [blame] | 184 | hd->parent = parent; |
| 185 | hd->driver = driver; |
Greg Kroah-Hartman | 1cd56a8 | 2014-12-19 14:56:36 -0800 | [diff] [blame^] | 186 | INIT_LIST_HEAD(&hd->interfaces); |
Alex Elder | 2c43ce4 | 2014-11-17 08:08:44 -0600 | [diff] [blame] | 187 | INIT_LIST_HEAD(&hd->connections); |
Alex Elder | 177404b | 2014-10-03 14:14:24 -0500 | [diff] [blame] | 188 | ida_init(&hd->cport_id_map); |
Alex Elder | 1bb3c72 | 2014-10-02 12:30:03 -0500 | [diff] [blame] | 189 | |
Greg Kroah-Hartman | a39879f | 2014-09-06 16:57:36 -0700 | [diff] [blame] | 190 | return hd; |
| 191 | } |
| 192 | EXPORT_SYMBOL_GPL(greybus_create_hd); |
| 193 | |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 194 | void greybus_remove_hd(struct greybus_host_device *hd) |
| 195 | { |
Greg Kroah-Hartman | f0f61b9 | 2014-10-24 17:34:46 +0800 | [diff] [blame] | 196 | /* Tear down all modules that happen to be associated with this host |
| 197 | * controller */ |
Greg Kroah-Hartman | 13e6aac | 2014-12-19 14:56:35 -0800 | [diff] [blame] | 198 | gb_remove_interfaces(hd); |
Greg Kroah-Hartman | 68f1fc4 | 2014-09-07 13:12:11 -0700 | [diff] [blame] | 199 | kref_put_mutex(&hd->kref, free_hd, &hd_mutex); |
| 200 | } |
| 201 | EXPORT_SYMBOL_GPL(greybus_remove_hd); |
| 202 | |
Greg Kroah-Hartman | 503c1cd | 2014-08-30 16:21:03 -0700 | [diff] [blame] | 203 | static int __init gb_init(void) |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 204 | { |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 205 | int retval; |
| 206 | |
Alex Elder | 1bb3c72 | 2014-10-02 12:30:03 -0500 | [diff] [blame] | 207 | BUILD_BUG_ON(HOST_DEV_CPORT_ID_MAX >= (long)CPORT_ID_BAD); |
Alex Elder | 1bb3c72 | 2014-10-02 12:30:03 -0500 | [diff] [blame] | 208 | |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 209 | retval = gb_debugfs_init(); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 210 | if (retval) { |
| 211 | pr_err("debugfs failed\n"); |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 212 | return retval; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 213 | } |
Greg Kroah-Hartman | db6e1fd | 2014-08-30 16:47:26 -0700 | [diff] [blame] | 214 | |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 215 | retval = bus_register(&greybus_bus_type); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 216 | if (retval) { |
| 217 | pr_err("bus_register failed\n"); |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 218 | goto error_bus; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 219 | } |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 220 | |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 221 | retval = gb_ap_init(); |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 222 | if (retval) { |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 223 | pr_err("gb_ap_init failed\n"); |
| 224 | goto error_ap; |
Greg Kroah-Hartman | 168db1c | 2014-09-13 16:15:52 -0700 | [diff] [blame] | 225 | } |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 226 | |
Alex Elder | 2eb585f | 2014-10-16 06:35:34 -0500 | [diff] [blame] | 227 | retval = gb_operation_init(); |
| 228 | if (retval) { |
| 229 | pr_err("gb_operation_init failed\n"); |
| 230 | goto error_operation; |
| 231 | } |
| 232 | |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 233 | if (!gb_protocol_init()) { |
| 234 | /* This only fails for duplicate protocol registration */ |
| 235 | retval = -EEXIST; |
| 236 | pr_err("gb_protocol_init failed\n"); |
| 237 | goto error_protocol; |
| 238 | } |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 239 | |
Alex Elder | 19d03de | 2014-11-05 16:12:53 -0600 | [diff] [blame] | 240 | return 0; /* Success */ |
| 241 | |
| 242 | error_protocol: |
| 243 | gb_operation_exit(); |
Alex Elder | 2eb585f | 2014-10-16 06:35:34 -0500 | [diff] [blame] | 244 | error_operation: |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 245 | gb_ap_exit(); |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 246 | error_ap: |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 247 | bus_unregister(&greybus_bus_type); |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 248 | error_bus: |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 249 | gb_debugfs_cleanup(); |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 250 | |
| 251 | return retval; |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 252 | } |
| 253 | |
Greg Kroah-Hartman | 503c1cd | 2014-08-30 16:21:03 -0700 | [diff] [blame] | 254 | static void __exit gb_exit(void) |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 255 | { |
Viresh Kumar | 35a52ca | 2014-11-13 18:14:33 +0530 | [diff] [blame] | 256 | gb_protocol_exit(); |
Alex Elder | 2eb585f | 2014-10-16 06:35:34 -0500 | [diff] [blame] | 257 | gb_operation_exit(); |
Greg Kroah-Hartman | 45f3678 | 2014-09-14 11:40:35 -0700 | [diff] [blame] | 258 | gb_ap_exit(); |
Greg Kroah-Hartman | 27fb831 | 2014-08-31 13:54:59 -0700 | [diff] [blame] | 259 | bus_unregister(&greybus_bus_type); |
Greg Kroah-Hartman | de536e3 | 2014-08-31 16:17:04 -0700 | [diff] [blame] | 260 | gb_debugfs_cleanup(); |
Greg Kroah-Hartman | 199d68d | 2014-08-30 16:20:22 -0700 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | module_init(gb_init); |
| 264 | module_exit(gb_exit); |
| 265 | |
Greg Kroah-Hartman | c8a797a | 2014-08-11 15:30:45 +0800 | [diff] [blame] | 266 | MODULE_LICENSE("GPL"); |
| 267 | MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |