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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-05 14:50:51 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-05 14:50:51 -0700 |
commit | 41844e36206be90cd4d962ea49b0abc3612a99d0 (patch) | |
tree | ce0b3a3403bc6abdb28f52779d0d7b57a51a5c86 /drivers/staging/greybus/gbphy.c | |
parent | 5691f0e9a3e7855832d5fd094801bf600347c2d0 (diff) | |
parent | fc1e2c8ea85e109acf09e74789e9b852f6eed251 (diff) | |
download | op-kernel-dev-41844e36206be90cd4d962ea49b0abc3612a99d0.zip op-kernel-dev-41844e36206be90cd4d962ea49b0abc3612a99d0.tar.gz |
Merge tag 'staging-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging and IIO updates from Greg KH:
"Here is the big staging and IIO driver pull request for 4.9-rc1.
There are a lot of patches in here, the majority due to the
drivers/staging/greybus/ subsystem being merged in with full
development history that went back a few years, in order to preserve
the work that those developers did over time.
Lots and lots of tiny cleanups happened in the tree as well, due to
the Outreachy application process and lots of other developers showing
up for the first time to clean code up. Along with those changes, we
deleted a wireless driver, and added a raspberrypi driver (currently
marked broken), and lots of new iio drivers.
Overall the tree still shrunk with more lines removed than added,
about 10 thousand lines removed in total. Full details are in the very
long shortlog below.
All of this has been in the linux-next tree with no issues. There will
be some merge problems with other subsystem trees, but those are all
minor problems and shouldn't be hard to work out when they happen
(MAINTAINERS and some lustre build problems with the IB tree)"
And furter from me asking for clarification about greybus:
"Right now there is a phone from Motorola shipping with this code (a
slightly older version, but the same tree), so even though Ara is not
alive in the same form, the functionality is happening. We are working
with the developers of that phone to merge the newer stuff in with
their fork so they can use the upstream version in future versions of
their phone product line.
Toshiba has at least one chip shipping in their catalog that
needs/uses this protocol over a Unipro link, and rumor has it that
there might be more in the future.
There are also other users of the greybus protocols, there is a talk
next week at ELC that shows how it is being used across a network
connection to control a device, and previous ELC talks have showed the
protocol stack being used over USB to drive embedded Linux boards.
I've also talked to some people who are starting to work to add a host
controller driver to control arduinos as the greybus PHY protocols are
very useful to control a serial/i2c/spio/whatever device across a
random physical link, as it is a way to have a self-describing device
be attached to a host without needing manual configuration.
So yes, people are using it, and there is still the chance that it
will show up in a phone/laptop/tablet/whatever from Google in the
future as well, the tech isn't dead, even if the original large phone
project happens to be"
* tag 'staging-4.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (3703 commits)
Staging: fbtft: Fix bug in fbtft-core
staging: rtl8188eu: fix double unlock error in rtw_resume_process()
staging:r8188eu: remove GEN_MLME_EXT_HANDLER macro
staging:r8188eu: remove GEN_DRV_CMD_HANDLER macro
staging:r8188eu: remove GEN_EVT_CODE macro
staging:r8188eu: remove GEN_CMD_CODE macro
staging:r8188eu: remove pkt_newalloc member of the recv_buf structure
staging:r8188eu: remove rtw_handle_dualmac declaration
staging:r8188eu: remove (RGTRY|BSSID)_(OFT|SZ) macros
staging:r8188eu: change rtl8188e_process_phy_info function argument type
Staging: fsl-mc: Remove blank lines
Staging: fsl-mc: Fix unaligned * in block comments
Staging: comedi: Align the * in block comments
Staging : ks7010 : Fix block comments warninig
Staging: vt6655: Remove explicit NULL comparison using Coccinelle
staging: rtl8188eu: core: rtw_xmit: Use macros instead of constants
staging: rtl8188eu: core: rtw_xmit: Move constant of the right side
staging: dgnc: Fix lines longer than 80 characters
Staging: dgnc: constify attribute_group structures
Staging: most: hdm-dim2: constify attribute_group structures
...
Diffstat (limited to 'drivers/staging/greybus/gbphy.c')
-rw-r--r-- | drivers/staging/greybus/gbphy.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/drivers/staging/greybus/gbphy.c b/drivers/staging/greybus/gbphy.c new file mode 100644 index 0000000..bcde7c9 --- /dev/null +++ b/drivers/staging/greybus/gbphy.c @@ -0,0 +1,360 @@ +/* + * Greybus Bridged-Phy Bus driver + * + * Copyright 2014 Google Inc. + * Copyright 2014 Linaro Ltd. + * + * 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" +#include "gbphy.h" + +#define GB_GBPHY_AUTOSUSPEND_MS 3000 + +struct gbphy_host { + struct gb_bundle *bundle; + struct list_head devices; +}; + +static DEFINE_IDA(gbphy_id); + +static ssize_t protocol_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gbphy_device *gbphy_dev = to_gbphy_dev(dev); + + return sprintf(buf, "0x%02x\n", gbphy_dev->cport_desc->protocol_id); +} +static DEVICE_ATTR_RO(protocol_id); + +static struct attribute *gbphy_dev_attrs[] = { + &dev_attr_protocol_id.attr, + NULL, +}; + +ATTRIBUTE_GROUPS(gbphy_dev); + +static void gbphy_dev_release(struct device *dev) +{ + struct gbphy_device *gbphy_dev = to_gbphy_dev(dev); + + ida_simple_remove(&gbphy_id, gbphy_dev->id); + kfree(gbphy_dev); +} + +#ifdef CONFIG_PM +static int gb_gbphy_idle(struct device *dev) +{ + pm_runtime_mark_last_busy(dev); + pm_request_autosuspend(dev); + return 0; +} +#endif + +static const struct dev_pm_ops gb_gbphy_pm_ops = { + SET_RUNTIME_PM_OPS(pm_generic_runtime_suspend, + pm_generic_runtime_resume, + gb_gbphy_idle) +}; + +static struct device_type greybus_gbphy_dev_type = { + .name = "gbphy_device", + .release = gbphy_dev_release, + .pm = &gb_gbphy_pm_ops, +}; + +static int gbphy_dev_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct gbphy_device *gbphy_dev = to_gbphy_dev(dev); + struct greybus_descriptor_cport *cport_desc = gbphy_dev->cport_desc; + struct gb_bundle *bundle = gbphy_dev->bundle; + struct gb_interface *intf = bundle->intf; + struct gb_module *module = intf->module; + struct gb_host_device *hd = intf->hd; + + if (add_uevent_var(env, "BUS=%u", hd->bus_id)) + return -ENOMEM; + if (add_uevent_var(env, "MODULE=%u", module->module_id)) + return -ENOMEM; + if (add_uevent_var(env, "INTERFACE=%u", intf->interface_id)) + return -ENOMEM; + if (add_uevent_var(env, "GREYBUS_ID=%08x/%08x", + intf->vendor_id, intf->product_id)) + return -ENOMEM; + if (add_uevent_var(env, "BUNDLE=%u", gbphy_dev->bundle->id)) + return -ENOMEM; + if (add_uevent_var(env, "BUNDLE_CLASS=%02x", bundle->class)) + return -ENOMEM; + if (add_uevent_var(env, "GBPHY=%u", gbphy_dev->id)) + return -ENOMEM; + if (add_uevent_var(env, "PROTOCOL_ID=%02x", cport_desc->protocol_id)) + return -ENOMEM; + + return 0; +} + +static const struct gbphy_device_id * +gbphy_dev_match_id(struct gbphy_device *gbphy_dev, struct gbphy_driver *gbphy_drv) +{ + const struct gbphy_device_id *id = gbphy_drv->id_table; + + if (!id) + return NULL; + + for (; id->protocol_id; id++) + if (id->protocol_id == gbphy_dev->cport_desc->protocol_id) + return id; + + return NULL; +} + +static int gbphy_dev_match(struct device *dev, struct device_driver *drv) +{ + struct gbphy_driver *gbphy_drv = to_gbphy_driver(drv); + struct gbphy_device *gbphy_dev = to_gbphy_dev(dev); + const struct gbphy_device_id *id; + + id = gbphy_dev_match_id(gbphy_dev, gbphy_drv); + if (id) + return 1; + + return 0; +} + +static int gbphy_dev_probe(struct device *dev) +{ + struct gbphy_driver *gbphy_drv = to_gbphy_driver(dev->driver); + struct gbphy_device *gbphy_dev = to_gbphy_dev(dev); + const struct gbphy_device_id *id; + int ret; + + id = gbphy_dev_match_id(gbphy_dev, gbphy_drv); + if (!id) + return -ENODEV; + + /* for old kernels we need get_sync to resume parent devices */ + ret = gb_pm_runtime_get_sync(gbphy_dev->bundle); + if (ret < 0) + return ret; + + pm_runtime_set_autosuspend_delay(dev, GB_GBPHY_AUTOSUSPEND_MS); + pm_runtime_use_autosuspend(dev); + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + /* + * Drivers should call put on the gbphy dev before returning + * from probe if they support runtime pm. + */ + ret = gbphy_drv->probe(gbphy_dev, id); + if (ret) { + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); + pm_runtime_put_noidle(dev); + pm_runtime_dont_use_autosuspend(dev); + } + + gb_pm_runtime_put_autosuspend(gbphy_dev->bundle); + + return ret; +} + +static int gbphy_dev_remove(struct device *dev) +{ + struct gbphy_driver *gbphy_drv = to_gbphy_driver(dev->driver); + struct gbphy_device *gbphy_dev = to_gbphy_dev(dev); + + gbphy_drv->remove(gbphy_dev); + + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); + pm_runtime_put_noidle(dev); + pm_runtime_dont_use_autosuspend(dev); + + return 0; +} + +static struct bus_type gbphy_bus_type = { + .name = "gbphy", + .match = gbphy_dev_match, + .probe = gbphy_dev_probe, + .remove = gbphy_dev_remove, + .uevent = gbphy_dev_uevent, +}; + +int gb_gbphy_register_driver(struct gbphy_driver *driver, + struct module *owner, const char *mod_name) +{ + int retval; + + if (greybus_disabled()) + return -ENODEV; + + driver->driver.bus = &gbphy_bus_type; + driver->driver.name = driver->name; + 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(gb_gbphy_register_driver); + +void gb_gbphy_deregister_driver(struct gbphy_driver *driver) +{ + driver_unregister(&driver->driver); +} +EXPORT_SYMBOL_GPL(gb_gbphy_deregister_driver); + +static struct gbphy_device *gb_gbphy_create_dev(struct gb_bundle *bundle, + struct greybus_descriptor_cport *cport_desc) +{ + struct gbphy_device *gbphy_dev; + int retval; + int id; + + id = ida_simple_get(&gbphy_id, 1, 0, GFP_KERNEL); + if (id < 0) + return ERR_PTR(id); + + gbphy_dev = kzalloc(sizeof(*gbphy_dev), GFP_KERNEL); + if (!gbphy_dev) { + ida_simple_remove(&gbphy_id, id); + return ERR_PTR(-ENOMEM); + } + + gbphy_dev->id = id; + gbphy_dev->bundle = bundle; + gbphy_dev->cport_desc = cport_desc; + gbphy_dev->dev.parent = &bundle->dev; + gbphy_dev->dev.bus = &gbphy_bus_type; + gbphy_dev->dev.type = &greybus_gbphy_dev_type; + gbphy_dev->dev.groups = gbphy_dev_groups; + gbphy_dev->dev.dma_mask = bundle->dev.dma_mask; + dev_set_name(&gbphy_dev->dev, "gbphy%d", id); + + retval = device_register(&gbphy_dev->dev); + if (retval) { + put_device(&gbphy_dev->dev); + return ERR_PTR(retval); + } + + return gbphy_dev; +} + +static void gb_gbphy_disconnect(struct gb_bundle *bundle) +{ + struct gbphy_host *gbphy_host = greybus_get_drvdata(bundle); + struct gbphy_device *gbphy_dev, *temp; + int ret; + + ret = gb_pm_runtime_get_sync(bundle); + if (ret < 0) + gb_pm_runtime_get_noresume(bundle); + + list_for_each_entry_safe(gbphy_dev, temp, &gbphy_host->devices, list) { + list_del(&gbphy_dev->list); + device_unregister(&gbphy_dev->dev); + } + + kfree(gbphy_host); +} + +static int gb_gbphy_probe(struct gb_bundle *bundle, + const struct greybus_bundle_id *id) +{ + struct gbphy_host *gbphy_host; + struct gbphy_device *gbphy_dev; + int i; + + if (bundle->num_cports == 0) + return -ENODEV; + + gbphy_host = kzalloc(sizeof(*gbphy_host), GFP_KERNEL); + if (!gbphy_host) + return -ENOMEM; + + gbphy_host->bundle = bundle; + INIT_LIST_HEAD(&gbphy_host->devices); + greybus_set_drvdata(bundle, gbphy_host); + + /* + * Create a bunch of children devices, one per cport, and bind the + * bridged phy drivers to them. + */ + for (i = 0; i < bundle->num_cports; ++i) { + gbphy_dev = gb_gbphy_create_dev(bundle, &bundle->cport_desc[i]); + if (IS_ERR(gbphy_dev)) { + gb_gbphy_disconnect(bundle); + return PTR_ERR(gbphy_dev); + } + list_add(&gbphy_dev->list, &gbphy_host->devices); + } + + gb_pm_runtime_put_autosuspend(bundle); + + return 0; +} + +static const struct greybus_bundle_id gb_gbphy_id_table[] = { + { GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_BRIDGED_PHY) }, + { }, +}; +MODULE_DEVICE_TABLE(greybus, gb_gbphy_id_table); + +static struct greybus_driver gb_gbphy_driver = { + .name = "gbphy", + .probe = gb_gbphy_probe, + .disconnect = gb_gbphy_disconnect, + .id_table = gb_gbphy_id_table, +}; + +static int __init gbphy_init(void) +{ + int retval; + + retval = bus_register(&gbphy_bus_type); + if (retval) { + pr_err("gbphy bus register failed (%d)\n", retval); + return retval; + } + + retval = greybus_register(&gb_gbphy_driver); + if (retval) { + pr_err("error registering greybus driver\n"); + goto error_gbphy; + } + + return 0; + +error_gbphy: + bus_unregister(&gbphy_bus_type); + ida_destroy(&gbphy_id); + return retval; +} +module_init(gbphy_init); + +static void __exit gbphy_exit(void) +{ + greybus_deregister(&gb_gbphy_driver); + bus_unregister(&gbphy_bus_type); + ida_destroy(&gbphy_id); +} +module_exit(gbphy_exit); + +MODULE_LICENSE("GPL v2"); |