greybus: Import most recent greybus code to new repo.
This commit is contained in:
Greg Kroah-Hartman
parent
cd26f1bd6b
commit
c8a797a98c
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@ -0,0 +1,22 @@
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greybus-y := core.o
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obj-m += greybus.o
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obj-m += i2c-gb.o
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KERNELVER ?= $(shell uname -r)
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KERNELDIR ?= /lib/modules/$(KERNELVER)/build
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PWD := $(shell pwd)
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all: module
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module:
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$(MAKE) -C $(KERNELDIR) M=$(PWD)
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clean:
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rm -f *.o *~ core .depend .*.cmd *.ko *.mod.c
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rm -f Module.markers Module.symvers modules.order
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rm -rf .tmp_versions Modules.symvers
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coccicheck:
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$(MAKE) -C $(KERNELDIR) M=$(PWD) coccicheck
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@ -0,0 +1,153 @@
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/*
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* Greybus "Core"
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*
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* Copyright 2014 Google Inc.
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*
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* Released under the GPLv2 only.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include "greybus.h"
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/* Allow greybus to be disabled at boot if needed */
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static bool nogreybus;
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#ifdef MODULE
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module_param(nogreybus, bool, 0444);
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#else
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core_param(nogreybus, bool, 0444);
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#endif
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int greybus_disabled(void)
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{
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return nogreybus;
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}
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EXPORT_SYMBOL_GPL(greybus_disabled);
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static int greybus_match_one_id(struct greybus_device *gdev,
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const struct greybus_device_id *id)
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{
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struct greybus_descriptor *des = &gdev->descriptor;
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if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_VENDOR) &&
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(des->wVendor != id->wVendor))
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return 0;
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if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_PRODUCT) &&
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(des->wProduct != id->wProduct))
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return 0;
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if ((id->match_flags & GREYBUS_DEVICE_ID_MATCH_SERIAL) &&
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(des->lSerialNumber != id->lSerialNumber))
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return 0;
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return 1;
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}
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static const struct greybus_device_id *greybus_match_id(
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struct greybus_device *gdev,
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const struct greybus_device_id *id)
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{
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if (id == NULL)
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return NULL;
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for (; id->wVendor || id->wProduct || id->lSerialNumber ||
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id->driver_info ; id++) {
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if (greybus_match_one_id(gdev, id))
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return id;
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}
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return NULL;
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}
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static int greybus_device_match(struct device *dev, struct device_driver *drv)
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{
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struct greybus_driver *driver = to_greybus_driver(dev->driver);
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struct greybus_device *gdev = to_greybus_device(dev);
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const struct greybus_device_id *id;
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id = greybus_match_id(gdev, driver->id_table);
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if (id)
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return 1;
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/* FIXME - Dyanmic ids? */
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return 0;
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}
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static int greybus_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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/* struct greybus_device *gdev = to_greybus_device(dev); */
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/* FIXME - add some uevents here... */
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return 0;
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}
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struct bus_type greybus_bus_type = {
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.name = "greybus",
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.match = greybus_device_match,
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.uevent = greybus_uevent,
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};
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static int greybus_probe(struct device *dev)
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{
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struct greybus_driver *driver = to_greybus_driver(dev->driver);
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struct greybus_device *gdev = to_greybus_device(dev);
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const struct greybus_device_id *id;
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int retval;
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/* match id */
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id = greybus_match_id(gdev, driver->id_table);
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if (!id)
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return -ENODEV;
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retval = driver->probe(gdev, id);
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if (retval)
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return retval;
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return 0;
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}
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static int greybus_remove(struct device *dev)
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{
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struct greybus_driver *driver = to_greybus_driver(dev->driver);
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struct greybus_device *gdev = to_greybus_device(dev);
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driver->disconnect(gdev);
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return 0;
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}
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int greybus_register_driver(struct greybus_driver *driver, struct module *owner,
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const char *mod_name)
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{
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int retval;
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if (greybus_disabled())
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return -ENODEV;
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driver->driver.name = driver->name;
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driver->driver.probe = greybus_probe;
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driver->driver.remove = greybus_remove;
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driver->driver.owner = owner;
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driver->driver.mod_name = mod_name;
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retval = driver_register(&driver->driver);
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if (retval)
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return retval;
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pr_info("registered new driver %s\n", driver->name);
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return 0;
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}
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EXPORT_SYMBOL_GPL(greybus_register_driver);
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void greybus_deregister(struct greybus_driver *driver)
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{
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driver_unregister(&driver->driver);
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}
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EXPORT_SYMBOL_GPL(greybus_deregister);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
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@ -0,0 +1,97 @@
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/*
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* Greybus driver and device API
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*
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* Copyright 2014 Google Inc.
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*
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* Released under the GPLv2 only.
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*/
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#ifndef __LINUX_GREYBUS_H
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#define __LINUX_GREYBUS_H
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#ifdef __KERNEL__
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include "greybus_id.h"
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#define GREYBUS_DEVICE_ID_MATCH_DEVICE \
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(GREYBUS_DEVICE_ID_MATCH_VENDOR | GREYBUS_DEVICE_ID_MATCH_PRODUCT)
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#define GREYBUS_DEVICE(vendor, product) \
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.match_flags = GREYBUS_DEVICE_ID_MATCH_DEVICE, \
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.wVendor = (vendor), \
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.wProduct = (product),
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#define GREYBUS_DEVICE_SERIAL(serial) \
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.match_flags = GREYBUS_DEVICE_ID_MATCH_SERIAL, \
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.lSerial = (serial),
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struct greybus_descriptor {
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__u16 wVendor;
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__u16 wProduct;
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__u64 lSerialNumber;
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};
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struct greybus_device {
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struct device dev;
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struct greybus_descriptor descriptor;
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};
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#define to_greybus_device(d) container_of(d, struct greybus_device, dev)
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struct greybus_driver {
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const char *name;
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int (*probe) (struct greybus_device *gdev,
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const struct greybus_device_id *id);
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void (*disconnect) (struct greybus_device *gdev);
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int (*suspend) (struct greybus_device *gdev, pm_message_t message);
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int (*resume) (struct greybus_device *gdev);
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const struct greybus_device_id *id_table;
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struct device_driver driver;
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};
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#define to_greybus_driver(d) container_of(d, struct greybus_driver, driver)
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static inline void greybus_set_drvdata(struct greybus_device *gdev, void *data)
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{
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dev_set_drvdata(&gdev->dev, data);
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}
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static inline void *greybus_get_drvdata(struct greybus_device *gdev)
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{
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return dev_get_drvdata(&gdev->dev);
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}
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/* Don't call these directly, use the module_greybus_driver() macro instead */
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int greybus_register_driver(struct greybus_driver *driver,
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struct module *module, const char *mod_name);
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void greybus_deregister(struct greybus_driver *driver);
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/* define to get proper THIS_MODULE and KBUILD_MODNAME values */
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#define greybus_register(driver) \
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greybus_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
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/**
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* module_greybus_driver() - Helper macro for registering a Greybus driver
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* @__greybus_driver: greybus_driver structure
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*
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* Helper macro for Greybus drivers to set up proper module init / exit
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* functions. Replaces module_init() and module_exit() and keeps people from
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* printing pointless things to the kernel log when their driver is loaded.
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*/
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#define module_greybus_driver(__greybus_driver) \
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module_driver(__greybus_driver, greybus_register, greybus_deregister)
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extern struct bus_type greybus_bus_type;
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int greybus_disabled(void);
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#endif /* __KERNEL__ */
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#endif /* __LINUX_GREYBUS_H */
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/* FIXME
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* move this to include/linux/mod_devicetable.h when merging
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*/
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#ifndef __LINUX_GREYBUS_ID_H
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#define __LINUX_GREYBUS_ID_H
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#include <linux/types.h>
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#include <linux/mod_devicetable.h>
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struct greybus_device_id {
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__u16 match_flags;
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__u16 wVendor;
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__u16 wProduct;
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__u64 lSerialNumber;
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kernel_ulong_t driver_info
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__attribute__((aligned(sizeof(kernel_ulong_t))));
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};
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/* Used to match the greybus_device_id */
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#define GREYBUS_DEVICE_ID_MATCH_VENDOR BIT(0)
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#define GREYBUS_DEVICE_ID_MATCH_PRODUCT BIT(1)
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#define GREYBUS_DEVICE_ID_MATCH_SERIAL BIT(2)
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#endif /* __LINUX_GREYBUS_H */
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/*
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* I2C bridge driver for the Greybus "generic" I2C module.
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*
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* Copyright 2014 Google Inc.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include "greybus.h"
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struct i2c_gb_data {
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struct i2c_adapter *adapter;
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struct greybus_device *gdev;
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};
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static const struct greybus_device_id id_table[] = {
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{ GREYBUS_DEVICE(0x42, 0x42) }, /* make shit up */
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{ }, /* terminating NULL entry */
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};
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/* We BETTER be able to do SMBUS protocl calls, otherwise we are bit-banging the
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* slowest thing possible over the fastest bus possible, crazy...
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* FIXME - research this, for now just assume we can
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*/
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static s32 i2c_gb_access(struct i2c_adapter *adap, u16 addr,
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unsigned short flags, char read_write, u8 command,
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int size, union i2c_smbus_data *data)
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{
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struct i2c_gb_data *i2c_gb_data;
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struct greybus_device *gdev;
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i2c_gb_data = i2c_get_adapdata(adap);
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gdev = i2c_gb_data->gdev;
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// FIXME - do the actual work of sending a i2c message here...
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switch (size) {
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case I2C_SMBUS_QUICK:
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case I2C_SMBUS_BYTE:
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case I2C_SMBUS_BYTE_DATA:
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case I2C_SMBUS_WORD_DATA:
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case I2C_SMBUS_PROC_CALL:
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case I2C_SMBUS_BLOCK_DATA:
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case I2C_SMBUS_I2C_BLOCK_BROKEN:
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case I2C_SMBUS_BLOCK_PROC_CALL:
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case I2C_SMBUS_I2C_BLOCK_DATA:
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default:
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dev_err(&gdev->dev, "Unsupported transaction %d\n", size);
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static u32 i2c_gb_func(struct i2c_adapter *adapter)
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{
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// FIXME - someone figure out what we really can support, for now just guess...
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return I2C_FUNC_SMBUS_QUICK |
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I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA |
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I2C_FUNC_SMBUS_WORD_DATA |
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I2C_FUNC_SMBUS_BLOCK_DATA |
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I2C_FUNC_SMBUS_WRITE_I2C_BLOCK |
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I2C_FUNC_SMBUS_PEC |
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I2C_FUNC_SMBUS_READ_I2C_BLOCK;
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}
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static const struct i2c_algorithm smbus_algorithm = {
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.smbus_xfer = i2c_gb_access,
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.functionality = i2c_gb_func,
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};
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static int i2c_gb_probe(struct greybus_device *gdev, const struct greybus_device_id *id)
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{
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struct i2c_gb_data *i2c_gb_data;
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struct i2c_adapter *adapter;
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i2c_gb_data = kzalloc(sizeof(*i2c_gb_data), GFP_KERNEL);
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if (!i2c_gb_data)
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return -ENOMEM;
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adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
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if (!adapter) {
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kfree(i2c_gb_data);
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return -ENOMEM;
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}
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i2c_set_adapdata(adapter, i2c_gb_data);
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adapter->owner = THIS_MODULE;
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adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
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adapter->algo = &smbus_algorithm;
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i2c_gb_data->gdev = gdev;
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i2c_gb_data->adapter = adapter;
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greybus_set_drvdata(gdev, i2c_gb_data);
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return 0;
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}
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static void i2c_gb_disconnect(struct greybus_device *gdev)
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{
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struct i2c_gb_data *i2c_gb_data;
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i2c_gb_data = greybus_get_drvdata(gdev);
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i2c_del_adapter(i2c_gb_data->adapter);
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kfree(i2c_gb_data->adapter);
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kfree(i2c_gb_data);
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}
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static struct greybus_driver i2c_gb_driver = {
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.probe = i2c_gb_probe,
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.disconnect = i2c_gb_disconnect,
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.id_table = id_table,
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};
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module_greybus_driver(i2c_gb_driver);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
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