| /* |
| * Greybus "Core" |
| * |
| * Copyright 2014 Google Inc. |
| * |
| * Released under the GPLv2 only. |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/types.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/device.h> |
| |
| #include "greybus.h" |
| |
| /* Allow greybus to be disabled at boot if needed */ |
| static bool nogreybus; |
| #ifdef MODULE |
| module_param(nogreybus, bool, 0444); |
| #else |
| core_param(nogreybus, bool, 0444); |
| #endif |
| int greybus_disabled(void) |
| { |
| return nogreybus; |
| } |
| EXPORT_SYMBOL_GPL(greybus_disabled); |
| |
| static int greybus_match_one_id(struct greybus_module *gmod, |
| const struct greybus_module_id *id) |
| { |
| struct greybus_descriptor_module *module; |
| |
| module = &gmod->module; |
| |
| if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_VENDOR) && |
| (id->vendor != le16_to_cpu(module->vendor))) |
| return 0; |
| |
| if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_PRODUCT) && |
| (id->product != le16_to_cpu(module->product))) |
| return 0; |
| |
| if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_SERIAL) && |
| (id->serial_number != le64_to_cpu(module->serial_number))) |
| return 0; |
| |
| return 1; |
| } |
| |
| static const struct greybus_module_id *greybus_match_id( |
| struct greybus_module *gmod, |
| const struct greybus_module_id *id) |
| { |
| if (id == NULL) |
| return NULL; |
| |
| for (; id->vendor || id->product || id->serial_number || |
| id->driver_info ; id++) { |
| if (greybus_match_one_id(gmod, id)) |
| return id; |
| } |
| |
| return NULL; |
| } |
| |
| static int greybus_module_match(struct device *dev, struct device_driver *drv) |
| { |
| struct greybus_driver *driver = to_greybus_driver(dev->driver); |
| struct greybus_module *gmod = to_greybus_module(dev); |
| const struct greybus_module_id *id; |
| |
| id = greybus_match_id(gmod, driver->id_table); |
| if (id) |
| return 1; |
| /* FIXME - Dyanmic ids? */ |
| return 0; |
| } |
| |
| static int greybus_uevent(struct device *dev, struct kobj_uevent_env *env) |
| { |
| /* struct greybus_module *gmod = to_greybus_module(dev); */ |
| |
| /* FIXME - add some uevents here... */ |
| return 0; |
| } |
| |
| static struct bus_type greybus_bus_type = { |
| .name = "greybus", |
| .match = greybus_module_match, |
| .uevent = greybus_uevent, |
| }; |
| |
| static int greybus_probe(struct device *dev) |
| { |
| struct greybus_driver *driver = to_greybus_driver(dev->driver); |
| struct greybus_module *gmod = to_greybus_module(dev); |
| const struct greybus_module_id *id; |
| int retval; |
| |
| /* match id */ |
| id = greybus_match_id(gmod, driver->id_table); |
| if (!id) |
| return -ENODEV; |
| |
| retval = driver->probe(gmod, id); |
| if (retval) |
| return retval; |
| |
| return 0; |
| } |
| |
| static int greybus_remove(struct device *dev) |
| { |
| struct greybus_driver *driver = to_greybus_driver(dev->driver); |
| struct greybus_module *gmod = to_greybus_module(dev); |
| |
| driver->disconnect(gmod); |
| return 0; |
| } |
| |
| int greybus_register_driver(struct greybus_driver *driver, struct module *owner, |
| const char *mod_name) |
| { |
| int retval; |
| |
| if (greybus_disabled()) |
| return -ENODEV; |
| |
| driver->driver.name = driver->name; |
| driver->driver.probe = greybus_probe; |
| driver->driver.remove = greybus_remove; |
| driver->driver.owner = owner; |
| driver->driver.mod_name = mod_name; |
| |
| retval = driver_register(&driver->driver); |
| if (retval) |
| return retval; |
| |
| pr_info("registered new driver %s\n", driver->name); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(greybus_register_driver); |
| |
| void greybus_deregister(struct greybus_driver *driver) |
| { |
| driver_unregister(&driver->driver); |
| } |
| EXPORT_SYMBOL_GPL(greybus_deregister); |
| |
| |
| static void greybus_module_release(struct device *dev) |
| { |
| struct greybus_module *gmod = to_greybus_module(dev); |
| int i; |
| |
| for (i = 0; i < gmod->num_strings; ++i) |
| kfree(gmod->string[i]); |
| kfree(gmod); |
| } |
| |
| |
| const u8 *greybus_string(struct greybus_module *gmod, int id) |
| { |
| int i; |
| struct gmod_string *string; |
| |
| if (!gmod) |
| return NULL; |
| |
| for (i = 0; i < gmod->num_strings; ++i) { |
| string = gmod->string[i]; |
| if (string->id == id) |
| return &string->string[0]; |
| } |
| return NULL; |
| } |
| |
| static struct device_type greybus_module_type = { |
| .name = "greybus_module", |
| .release = greybus_module_release, |
| }; |
| |
| static int gb_init_subdevs(struct greybus_module *gmod, |
| const struct greybus_module_id *id) |
| { |
| int retval; |
| |
| /* Allocate all of the different "sub device types" for this device */ |
| retval = gb_i2c_probe(gmod, id); |
| if (retval) |
| goto error_i2c; |
| |
| retval = gb_gpio_probe(gmod, id); |
| if (retval) |
| goto error_gpio; |
| |
| retval = gb_sdio_probe(gmod, id); |
| if (retval) |
| goto error_sdio; |
| |
| retval = gb_tty_probe(gmod, id); |
| if (retval) |
| goto error_tty; |
| |
| retval = gb_battery_probe(gmod, id); |
| if (retval) |
| goto error_battery; |
| return 0; |
| |
| error_battery: |
| gb_tty_disconnect(gmod); |
| |
| error_tty: |
| gb_sdio_disconnect(gmod); |
| |
| error_sdio: |
| gb_gpio_disconnect(gmod); |
| |
| error_gpio: |
| gb_i2c_disconnect(gmod); |
| |
| error_i2c: |
| return retval; |
| } |
| |
| static const struct greybus_module_id fake_gb_id = { |
| GREYBUS_DEVICE(0x42, 0x42) |
| }; |
| |
| static int create_function(struct greybus_module *gmod, |
| struct greybus_descriptor_function *function, |
| size_t desc_size) |
| { |
| if (desc_size != sizeof(*function)) { |
| dev_err(gmod->dev.parent, "invalid function header size %zu\n", |
| desc_size); |
| return -EINVAL; |
| } |
| memcpy(&gmod->function, function, desc_size); |
| return 0; |
| } |
| |
| static int create_module(struct greybus_module *gmod, |
| struct greybus_descriptor_module *module, |
| size_t desc_size) |
| { |
| if (desc_size != sizeof(*module)) { |
| dev_err(gmod->dev.parent, "invalid module header size %zu\n", |
| desc_size); |
| return -EINVAL; |
| } |
| memcpy(&gmod->module, module, desc_size); |
| return 0; |
| } |
| |
| static int create_string(struct greybus_module *gmod, |
| struct greybus_descriptor_string *string, |
| size_t desc_size) |
| { |
| int string_size; |
| struct gmod_string *gmod_string; |
| |
| if (gmod->num_strings == MAX_STRINGS_PER_MODULE) { |
| dev_err(gmod->dev.parent, |
| "too many strings for this module!\n"); |
| return -EINVAL; |
| } |
| |
| if (desc_size < sizeof(*string)) { |
| dev_err(gmod->dev.parent, "invalid string header size %zu\n", |
| desc_size); |
| return -EINVAL; |
| } |
| |
| string_size = string->length; |
| gmod_string = kzalloc(sizeof(*gmod_string) + string_size + 1, GFP_KERNEL); |
| if (!gmod_string) |
| return -ENOMEM; |
| |
| gmod_string->length = string_size; |
| gmod_string->id = string->id; |
| memcpy(&gmod_string->string, &string->string, string_size); |
| |
| gmod->string[gmod->num_strings] = gmod_string; |
| gmod->num_strings++; |
| |
| return 0; |
| } |
| |
| static int create_cport(struct greybus_module *gmod, |
| struct greybus_descriptor_cport *cport, |
| size_t desc_size) |
| { |
| if (gmod->num_cports == MAX_CPORTS_PER_MODULE) { |
| dev_err(gmod->dev.parent, "too many cports for this module!\n"); |
| return -EINVAL; |
| } |
| |
| if (desc_size != sizeof(*cport)) { |
| dev_err(gmod->dev.parent, |
| "invalid cport descriptor size %zu\n", desc_size); |
| return -EINVAL; |
| } |
| |
| gmod->cport_ids[gmod->num_cports] = le16_to_cpu(cport->id); |
| gmod->num_cports++; |
| |
| return 0; |
| } |
| |
| /** |
| * gb_add_module |
| * |
| * Pass in a buffer that _should_ contain a Greybus module manifest |
| * and register a greybus device structure with the kernel core. |
| */ |
| void gb_add_module(struct greybus_host_device *hd, u8 module_id, |
| u8 *data, int size) |
| { |
| struct greybus_module *gmod; |
| struct greybus_manifest *manifest; |
| int retval; |
| int overall_size; |
| |
| /* we have to have at _least_ the manifest header */ |
| if (size <= sizeof(manifest->header)) |
| return; |
| |
| gmod = kzalloc(sizeof(*gmod), GFP_KERNEL); |
| if (!gmod) |
| return; |
| |
| gmod->module_number = module_id; |
| gmod->dev.parent = hd->parent; |
| gmod->dev.driver = NULL; |
| gmod->dev.bus = &greybus_bus_type; |
| gmod->dev.type = &greybus_module_type; |
| gmod->dev.groups = greybus_module_groups; |
| gmod->dev.dma_mask = hd->parent->dma_mask; |
| device_initialize(&gmod->dev); |
| dev_set_name(&gmod->dev, "%d", module_id); |
| |
| manifest = (struct greybus_manifest *)data; |
| overall_size = le16_to_cpu(manifest->header.size); |
| if (overall_size != size) { |
| dev_err(hd->parent, "size != manifest header size, %d != %d\n", |
| size, overall_size); |
| goto error; |
| } |
| |
| /* Validate major/minor number */ |
| if (manifest->header.version_major > GREYBUS_VERSION_MAJOR) { |
| dev_err(hd->parent, |
| "Manifest version too new (%hhu.%hhu > %hhu.%hhu)\n", |
| manifest->header.version_major, |
| manifest->header.version_minor, |
| GREYBUS_VERSION_MAJOR, GREYBUS_VERSION_MINOR); |
| goto error; |
| } |
| |
| size -= sizeof(manifest->header); |
| data += sizeof(manifest->header); |
| while (size > 0) { |
| struct greybus_descriptor *desc; |
| u16 desc_size; |
| size_t data_size; |
| |
| if (size < sizeof(desc->header)) { |
| dev_err(hd->parent, "remaining size %d too small\n", |
| size); |
| goto error; |
| } |
| desc = (struct greybus_descriptor *)data; |
| desc_size = le16_to_cpu(desc->header.size); |
| if (size < desc_size) { |
| dev_err(hd->parent, "descriptor size %d too big\n", |
| desc_size); |
| goto error; |
| } |
| data_size = (size_t)desc_size - sizeof(desc->header); |
| |
| switch (le16_to_cpu(desc->header.type)) { |
| case GREYBUS_TYPE_FUNCTION: |
| retval = create_function(gmod, &desc->function, |
| data_size); |
| break; |
| |
| case GREYBUS_TYPE_MODULE: |
| retval = create_module(gmod, &desc->module, |
| data_size); |
| break; |
| |
| case GREYBUS_TYPE_STRING: |
| retval = create_string(gmod, &desc->string, data_size); |
| break; |
| |
| case GREYBUS_TYPE_CPORT: |
| retval = create_cport(gmod, &desc->cport, data_size); |
| break; |
| |
| case GREYBUS_TYPE_INVALID: |
| default: |
| dev_err(hd->parent, "invalid descriptor type %d\n", |
| desc->header.type); |
| goto error; |
| } |
| if (retval) |
| goto error; |
| size -= desc_size; |
| data += desc_size; |
| } |
| |
| retval = gb_init_subdevs(gmod, &fake_gb_id); |
| if (retval) |
| goto error; |
| |
| // FIXME device_add(&gmod->dev); |
| |
| //return gmod; |
| return; |
| error: |
| put_device(&gmod->dev); |
| greybus_module_release(&gmod->dev); |
| } |
| |
| void gb_remove_module(struct greybus_host_device *hd, u8 module_id) |
| { |
| // FIXME should be the remove_device call... |
| } |
| |
| void greybus_remove_device(struct greybus_module *gmod) |
| { |
| /* tear down all of the "sub device types" for this device */ |
| gb_i2c_disconnect(gmod); |
| gb_gpio_disconnect(gmod); |
| gb_sdio_disconnect(gmod); |
| gb_tty_disconnect(gmod); |
| gb_battery_disconnect(gmod); |
| |
| // FIXME - device_remove(&gmod->dev); |
| } |
| |
| static DEFINE_MUTEX(hd_mutex); |
| |
| static void free_hd(struct kref *kref) |
| { |
| struct greybus_host_device *hd; |
| |
| hd = container_of(kref, struct greybus_host_device, kref); |
| |
| kfree(hd); |
| } |
| |
| struct greybus_host_device *greybus_create_hd(struct greybus_host_driver *driver, |
| struct device *parent) |
| { |
| struct greybus_host_device *hd; |
| |
| hd = kzalloc(sizeof(*hd) + driver->hd_priv_size, GFP_KERNEL); |
| if (!hd) |
| return NULL; |
| |
| kref_init(&hd->kref); |
| hd->parent = parent; |
| hd->driver = driver; |
| |
| return hd; |
| } |
| EXPORT_SYMBOL_GPL(greybus_create_hd); |
| |
| void greybus_remove_hd(struct greybus_host_device *hd) |
| { |
| kref_put_mutex(&hd->kref, free_hd, &hd_mutex); |
| } |
| EXPORT_SYMBOL_GPL(greybus_remove_hd); |
| |
| |
| static int __init gb_init(void) |
| { |
| int retval; |
| |
| retval = gb_debugfs_init(); |
| if (retval) { |
| pr_err("debugfs failed\n"); |
| return retval; |
| } |
| |
| retval = bus_register(&greybus_bus_type); |
| if (retval) { |
| pr_err("bus_register failed\n"); |
| goto error_bus; |
| } |
| |
| retval = gb_ap_init(); |
| if (retval) { |
| pr_err("gb_ap_init failed\n"); |
| goto error_ap; |
| } |
| |
| retval = gb_gbuf_init(); |
| if (retval) { |
| pr_err("gb_gbuf_init failed\n"); |
| goto error_gbuf; |
| } |
| |
| retval = gb_tty_init(); |
| if (retval) { |
| pr_err("gb_tty_init failed\n"); |
| goto error_tty; |
| } |
| |
| return 0; |
| |
| error_tty: |
| gb_gbuf_exit(); |
| |
| error_gbuf: |
| gb_ap_exit(); |
| |
| error_ap: |
| bus_unregister(&greybus_bus_type); |
| |
| error_bus: |
| gb_debugfs_cleanup(); |
| |
| return retval; |
| } |
| |
| static void __exit gb_exit(void) |
| { |
| gb_tty_exit(); |
| gb_gbuf_exit(); |
| gb_ap_exit(); |
| bus_unregister(&greybus_bus_type); |
| gb_debugfs_cleanup(); |
| } |
| |
| module_init(gb_init); |
| module_exit(gb_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |