4 * Copyright 2014 Google Inc.
6 * Released under the GPLv2 only.
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/types.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/kernel.h>
15 #include <linux/slab.h>
16 #include <linux/device.h>
20 /* Allow greybus to be disabled at boot if needed */
21 static bool nogreybus;
23 module_param(nogreybus, bool, 0444);
25 core_param(nogreybus, bool, 0444);
27 int greybus_disabled(void)
31 EXPORT_SYMBOL_GPL(greybus_disabled);
33 static spinlock_t cport_id_map_lock;
35 static int greybus_module_match(struct device *dev, struct device_driver *drv)
37 struct greybus_driver *driver = to_greybus_driver(dev->driver);
38 struct gb_module *gmod = to_gb_module(dev);
39 const struct greybus_module_id *id;
41 id = gb_module_match_id(gmod, driver->id_table);
44 /* FIXME - Dyanmic ids? */
48 static int greybus_uevent(struct device *dev, struct kobj_uevent_env *env)
50 /* struct gb_module *gmod = to_gb_module(dev); */
52 /* FIXME - add some uevents here... */
56 static struct bus_type greybus_bus_type = {
58 .match = greybus_module_match,
59 .uevent = greybus_uevent,
62 static int greybus_probe(struct device *dev)
64 struct greybus_driver *driver = to_greybus_driver(dev->driver);
65 struct gb_module *gmod = to_gb_module(dev);
66 const struct greybus_module_id *id;
70 id = gb_module_match_id(gmod, driver->id_table);
74 retval = driver->probe(gmod, id);
81 static int greybus_remove(struct device *dev)
83 struct greybus_driver *driver = to_greybus_driver(dev->driver);
84 struct gb_module *gmod = to_gb_module(dev);
86 driver->disconnect(gmod);
90 int greybus_register_driver(struct greybus_driver *driver, struct module *owner,
95 if (greybus_disabled())
98 driver->driver.name = driver->name;
99 driver->driver.probe = greybus_probe;
100 driver->driver.remove = greybus_remove;
101 driver->driver.owner = owner;
102 driver->driver.mod_name = mod_name;
104 retval = driver_register(&driver->driver);
108 pr_info("registered new driver %s\n", driver->name);
111 EXPORT_SYMBOL_GPL(greybus_register_driver);
113 void greybus_deregister(struct greybus_driver *driver)
115 driver_unregister(&driver->driver);
117 EXPORT_SYMBOL_GPL(greybus_deregister);
120 static void greybus_module_release(struct device *dev)
122 struct gb_module *gmod = to_gb_module(dev);
125 for (i = 0; i < gmod->num_strings; ++i)
126 kfree(gmod->string[i]);
131 static struct device_type greybus_module_type = {
132 .name = "greybus_module",
133 .release = greybus_module_release,
137 * This needs to be driven by the list of functions that the
138 * manifest says are present.
140 static int gb_init_subdevs(struct gb_module *gmod,
141 const struct greybus_module_id *id)
145 /* Allocate all of the different "sub device types" for this device */
148 * Decide what exactly we should get supplied for the i2c
149 * probe, and then work that back to what should be present
152 retval = gb_i2c_probe(gmod, id);
156 retval = gb_gpio_probe(gmod, id);
160 retval = gb_sdio_probe(gmod, id);
164 retval = gb_tty_probe(gmod, id);
168 retval = gb_battery_probe(gmod, id);
174 gb_tty_disconnect(gmod);
177 gb_sdio_disconnect(gmod);
180 gb_gpio_disconnect(gmod);
183 gb_i2c_disconnect(gmod);
189 static const struct greybus_module_id fake_greybus_module_id = {
190 GREYBUS_DEVICE(0x42, 0x42)
197 * Pass in a buffer that _should_ contain a Greybus module manifest
198 * and register a greybus device structure with the kernel core.
200 void gb_add_module(struct greybus_host_device *hd, u8 module_id,
203 struct gb_module *gmod;
206 gmod = gb_module_create(hd, module_id);
208 dev_err(hd->parent, "failed to create module\n");
213 * Parse the manifest and build up our data structures
214 * representing what's in it.
216 if (!gb_manifest_parse(gmod, data, size)) {
217 dev_err(hd->parent, "manifest error\n");
223 * We've successfully parsed the manifest. Now we need to
224 * allocate CPort Id's for connecting to the CPorts found on
225 * other modules. For each of these, establish a connection
226 * between the local and remote CPorts (including
227 * configuring the switch to allow them to communicate).
230 gmod->dev.parent = hd->parent;
231 gmod->dev.driver = NULL;
232 gmod->dev.bus = &greybus_bus_type;
233 gmod->dev.type = &greybus_module_type;
234 gmod->dev.groups = greybus_module_groups;
235 gmod->dev.dma_mask = hd->parent->dma_mask;
236 device_initialize(&gmod->dev);
237 dev_set_name(&gmod->dev, "%d", module_id);
239 retval = device_add(&gmod->dev);
243 retval = gb_init_subdevs(gmod, &fake_greybus_module_id);
251 device_del(&gmod->dev);
254 gb_module_destroy(gmod);
256 put_device(&gmod->dev);
257 greybus_module_release(&gmod->dev);
260 void gb_remove_module(struct greybus_host_device *hd, u8 module_id)
262 struct gb_module *gmod;
265 list_for_each_entry(gmod, &hd->modules, links)
266 if (gmod->module_id == module_id) {
272 greybus_remove_device(gmod);
274 dev_err(hd->parent, "module id %d remove error\n", module_id);
277 void greybus_remove_device(struct gb_module *gmod)
279 /* tear down all of the "sub device types" for this device */
280 gb_i2c_disconnect(gmod);
281 gb_gpio_disconnect(gmod);
282 gb_sdio_disconnect(gmod);
283 gb_tty_disconnect(gmod);
284 gb_battery_disconnect(gmod);
286 device_del(&gmod->dev);
287 put_device(&gmod->dev);
290 static DEFINE_MUTEX(hd_mutex);
292 static void free_hd(struct kref *kref)
294 struct greybus_host_device *hd;
296 hd = container_of(kref, struct greybus_host_device, kref);
301 struct greybus_host_device *greybus_create_hd(struct greybus_host_driver *driver,
302 struct device *parent)
304 struct greybus_host_device *hd;
306 hd = kzalloc(sizeof(*hd) + driver->hd_priv_size, GFP_KERNEL);
310 kref_init(&hd->kref);
313 INIT_LIST_HEAD(&hd->modules);
314 hd->connections = RB_ROOT;
315 ida_init(&hd->cport_id_map);
319 EXPORT_SYMBOL_GPL(greybus_create_hd);
321 void greybus_remove_hd(struct greybus_host_device *hd)
323 kref_put_mutex(&hd->kref, free_hd, &hd_mutex);
325 EXPORT_SYMBOL_GPL(greybus_remove_hd);
328 static int __init gb_init(void)
332 BUILD_BUG_ON(HOST_DEV_CPORT_ID_MAX >= (long)CPORT_ID_BAD);
333 spin_lock_init(&cport_id_map_lock);
335 retval = gb_debugfs_init();
337 pr_err("debugfs failed\n");
341 retval = bus_register(&greybus_bus_type);
343 pr_err("bus_register failed\n");
347 retval = gb_ap_init();
349 pr_err("gb_ap_init failed\n");
353 retval = gb_gbuf_init();
355 pr_err("gb_gbuf_init failed\n");
359 retval = gb_tty_init();
361 pr_err("gb_tty_init failed\n");
374 bus_unregister(&greybus_bus_type);
377 gb_debugfs_cleanup();
382 static void __exit gb_exit(void)
387 bus_unregister(&greybus_bus_type);
388 gb_debugfs_cleanup();
391 module_init(gb_init);
392 module_exit(gb_exit);
394 MODULE_LICENSE("GPL");
395 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");