| /* |
| * 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/kthread.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_device *gdev, |
| const struct greybus_module_id *id) |
| { |
| struct greybus_descriptor_module_id *module_id; |
| struct greybus_descriptor_serial_number *serial_num; |
| |
| module_id = &gdev->module_id; |
| serial_num = &gdev->serial_number; |
| |
| if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_VENDOR) && |
| (id->vendor != le16_to_cpu(module_id->vendor))) |
| return 0; |
| |
| if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_PRODUCT) && |
| (id->product != le16_to_cpu(module_id->product))) |
| return 0; |
| |
| if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_SERIAL) && |
| (id->serial_number != le64_to_cpu(serial_num->serial_number))) |
| return 0; |
| |
| return 1; |
| } |
| |
| static const struct greybus_module_id *greybus_match_id( |
| struct greybus_device *gdev, |
| 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(gdev, id)) |
| return id; |
| } |
| |
| return NULL; |
| } |
| |
| static int greybus_device_match(struct device *dev, struct device_driver *drv) |
| { |
| struct greybus_driver *driver = to_greybus_driver(dev->driver); |
| struct greybus_device *gdev = to_greybus_device(dev); |
| const struct greybus_module_id *id; |
| |
| id = greybus_match_id(gdev, 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_device *gdev = to_greybus_device(dev); */ |
| |
| /* FIXME - add some uevents here... */ |
| return 0; |
| } |
| |
| static struct bus_type greybus_bus_type = { |
| .name = "greybus", |
| .match = greybus_device_match, |
| .uevent = greybus_uevent, |
| }; |
| |
| static int greybus_probe(struct device *dev) |
| { |
| struct greybus_driver *driver = to_greybus_driver(dev->driver); |
| struct greybus_device *gdev = to_greybus_device(dev); |
| const struct greybus_module_id *id; |
| int retval; |
| |
| /* match id */ |
| id = greybus_match_id(gdev, driver->id_table); |
| if (!id) |
| return -ENODEV; |
| |
| retval = driver->probe(gdev, 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_device *gdev = to_greybus_device(dev); |
| |
| driver->disconnect(gdev); |
| 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_device *gdev = to_greybus_device(dev); |
| int i; |
| |
| for (i = 0; i < gdev->num_strings; ++i) |
| kfree(gdev->string[i]); |
| for (i = 0; i < gdev->num_cports; ++i) |
| kfree(gdev->cport[i]); |
| kfree(gdev); |
| } |
| |
| |
| const u8 *greybus_string(struct greybus_device *gdev, int id) |
| { |
| int i; |
| struct gdev_string *string; |
| |
| if (!gdev) |
| return NULL; |
| |
| for (i = 0; i < gdev->num_strings; ++i) { |
| string = gdev->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_device *gdev, |
| const struct greybus_module_id *id) |
| { |
| int retval; |
| |
| /* Allocate all of the different "sub device types" for this device */ |
| retval = gb_i2c_probe(gdev, id); |
| if (retval) |
| goto error_i2c; |
| |
| retval = gb_gpio_probe(gdev, id); |
| if (retval) |
| goto error_gpio; |
| |
| retval = gb_sdio_probe(gdev, id); |
| if (retval) |
| goto error_sdio; |
| |
| retval = gb_tty_probe(gdev, id); |
| if (retval) |
| goto error_tty; |
| return 0; |
| |
| error_tty: |
| gb_sdio_disconnect(gdev); |
| |
| error_sdio: |
| gb_gpio_disconnect(gdev); |
| |
| error_gpio: |
| gb_i2c_disconnect(gdev); |
| |
| error_i2c: |
| return retval; |
| } |
| |
| static const struct greybus_module_id fake_gb_id = |
| { GREYBUS_DEVICE(0x42, 0x42) }; |
| |
| static int create_function(struct greybus_device *gdev, |
| struct greybus_descriptor *desc, int desc_size) |
| { |
| int header_size = sizeof(struct greybus_descriptor_function); |
| |
| if (desc_size != header_size) { |
| dev_err(gdev->dev.parent, "invalid function header size %d\n", |
| desc_size); |
| return -EINVAL; |
| } |
| memcpy(&gdev->function, &desc->function, header_size); |
| return 0; |
| } |
| |
| static int create_module_id(struct greybus_device *gdev, |
| struct greybus_descriptor *desc, int desc_size) |
| { |
| int header_size = sizeof(struct greybus_descriptor_module_id); |
| |
| if (desc_size != header_size) { |
| dev_err(gdev->dev.parent, "invalid module header size %d\n", |
| desc_size); |
| return -EINVAL; |
| } |
| memcpy(&gdev->module_id, &desc->module_id, header_size); |
| return 0; |
| } |
| |
| static int create_serial_number(struct greybus_device *gdev, |
| struct greybus_descriptor *desc, int desc_size) |
| { |
| int header_size = sizeof(struct greybus_descriptor_serial_number); |
| |
| if (desc_size != header_size) { |
| dev_err(gdev->dev.parent, "invalid serial number header size %d\n", |
| desc_size); |
| return -EINVAL; |
| } |
| memcpy(&gdev->serial_number, &desc->serial_number, header_size); |
| return 0; |
| } |
| |
| static int create_string(struct greybus_device *gdev, |
| struct greybus_descriptor *desc, int desc_size) |
| { |
| int string_size; |
| struct gdev_string *string; |
| int header_size = sizeof(struct greybus_descriptor_string); |
| |
| if ((gdev->num_strings + 1) >= MAX_STRINGS_PER_MODULE) { |
| dev_err(gdev->dev.parent, |
| "too many strings for this module!\n"); |
| return -EINVAL; |
| } |
| |
| if (desc_size < header_size) { |
| dev_err(gdev->dev.parent, "invalid string header size %d\n", |
| desc_size); |
| return -EINVAL; |
| } |
| |
| string_size = le16_to_cpu(desc->string.length); |
| string = kzalloc(sizeof(*string) + string_size + 1, GFP_KERNEL); |
| if (!string) |
| return -ENOMEM; |
| |
| string->length = string_size; |
| string->id = desc->string.id; |
| memcpy(&string->string, &desc->string.string, string_size); |
| |
| gdev->string[gdev->num_strings] = string; |
| gdev->num_strings++; |
| |
| return 0; |
| } |
| |
| static int create_cport(struct greybus_device *gdev, |
| struct greybus_descriptor *desc, int desc_size) |
| { |
| struct gdev_cport *cport; |
| int header_size = sizeof(struct greybus_descriptor_cport); |
| |
| if ((gdev->num_cports + 1) >= MAX_CPORTS_PER_MODULE) { |
| dev_err(gdev->dev.parent, "too many cports for this module!\n"); |
| return -EINVAL; |
| } |
| |
| if (desc_size != header_size) { |
| dev_err(gdev->dev.parent, |
| "invalid serial number header size %d\n", desc_size); |
| return -EINVAL; |
| } |
| |
| cport = kzalloc(sizeof(*cport), GFP_KERNEL); |
| if (!cport) |
| return -ENOMEM; |
| |
| cport->number = le16_to_cpu(desc->cport.number); |
| cport->size = le16_to_cpu(desc->cport.size); |
| cport->speed = desc->cport.speed; |
| |
| gdev->cport[gdev->num_cports] = cport; |
| gdev->num_cports++; |
| |
| return 0; |
| } |
| |
| /** |
| * greybus_new_device: |
| * |
| * Pass in a buffer that _should_ be a set of greybus descriptor fields and spit |
| * out a greybus device structure. |
| */ |
| struct greybus_device *greybus_new_device(struct device *parent, |
| int module_number, u8 *data, int size) |
| { |
| struct greybus_device *gdev; |
| struct greybus_descriptor_block_header *block; |
| struct greybus_descriptor *desc; |
| int retval; |
| int overall_size; |
| int desc_size; |
| u8 version_major; |
| u8 version_minor; |
| |
| /* we have to have at _least_ the block header */ |
| if (size <= sizeof(struct greybus_descriptor_block_header)) |
| return NULL; |
| |
| gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
| if (!gdev) |
| return NULL; |
| |
| gdev->module_number = module_number; |
| gdev->dev.parent = parent; |
| gdev->dev.driver = NULL; |
| gdev->dev.bus = &greybus_bus_type; |
| gdev->dev.type = &greybus_module_type; |
| gdev->dev.groups = greybus_module_groups; |
| gdev->dev.dma_mask = parent->dma_mask; |
| device_initialize(&gdev->dev); |
| dev_set_name(&gdev->dev, "%d", module_number); |
| |
| block = (struct greybus_descriptor_block_header *)data; |
| overall_size = le16_to_cpu(block->size); |
| if (overall_size != size) { |
| dev_err(parent, "size != block header size, %d != %d\n", size, |
| overall_size); |
| goto error; |
| } |
| |
| version_major = block->version_major; |
| version_minor = block->version_minor; |
| |
| // FIXME - check version major/minor here! |
| |
| size -= sizeof(struct greybus_descriptor_block_header); |
| data += sizeof(struct greybus_descriptor_block_header); |
| while (size > 0) { |
| desc = (struct greybus_descriptor *)data; |
| desc_size = le16_to_cpu(desc->header.size); |
| |
| switch (desc->header.type) { |
| case GREYBUS_TYPE_FUNCTION: |
| retval = create_function(gdev, desc, desc_size); |
| break; |
| |
| case GREYBUS_TYPE_MODULE_ID: |
| retval = create_module_id(gdev, desc, desc_size); |
| break; |
| |
| case GREYBUS_TYPE_SERIAL_NUMBER: |
| retval = create_serial_number(gdev, desc, desc_size); |
| break; |
| |
| case GREYBUS_TYPE_STRING: |
| retval = create_string(gdev, desc, desc_size); |
| break; |
| |
| case GREYBUS_TYPE_CPORT: |
| retval = create_cport(gdev, desc, desc_size); |
| break; |
| |
| case GREYBUS_TYPE_INVALID: |
| default: |
| dev_err(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(gdev, &fake_gb_id); |
| if (retval) |
| goto error; |
| |
| // FIXME device_add(&gdev->dev); |
| |
| |
| return gdev; |
| error: |
| greybus_module_release(&gdev->dev); |
| return NULL; |
| } |
| |
| void greybus_remove_device(struct greybus_device *gdev) |
| { |
| /* tear down all of the "sub device types" for this device */ |
| gb_i2c_disconnect(gdev); |
| gb_gpio_disconnect(gdev); |
| gb_sdio_disconnect(gdev); |
| gb_tty_disconnect(gdev); |
| |
| // FIXME - device_remove(&gdev->dev); |
| } |
| |
| static int __init gb_init(void) |
| { |
| int retval; |
| |
| retval = gb_debugfs_init(); |
| if (retval) |
| return retval; |
| |
| retval = bus_register(&greybus_bus_type); |
| if (retval) |
| goto error_bus; |
| |
| retval = gb_thread_init(); |
| if (retval) |
| goto error_thread; |
| |
| // FIXME - more gb core init goes here |
| |
| retval = gb_tty_init(); |
| if (retval) |
| goto error_tty; |
| |
| return 0; |
| |
| error_tty: |
| gb_thread_destroy(); |
| |
| error_thread: |
| bus_unregister(&greybus_bus_type); |
| |
| error_bus: |
| gb_debugfs_cleanup(); |
| |
| return retval; |
| } |
| |
| static void __exit gb_exit(void) |
| { |
| gb_tty_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>"); |