soundwire: Add SoundWire bus type
This adds the base SoundWire bus type, bus and driver registration. along with changes to module device table for new SoundWire device type. Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>hifive-unleashed-5.1
Vinod Koul
Greg Kroah-Hartman
parent
8ecf4264ef
commit
9251345dca
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@ -153,6 +153,8 @@ source "drivers/remoteproc/Kconfig"
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source "drivers/rpmsg/Kconfig"
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source "drivers/soundwire/Kconfig"
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source "drivers/soc/Kconfig"
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source "drivers/devfreq/Kconfig"
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@ -158,6 +158,7 @@ obj-$(CONFIG_MAILBOX) += mailbox/
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obj-$(CONFIG_HWSPINLOCK) += hwspinlock/
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obj-$(CONFIG_REMOTEPROC) += remoteproc/
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obj-$(CONFIG_RPMSG) += rpmsg/
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obj-$(CONFIG_SOUNDWIRE) += soundwire/
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# Virtualization drivers
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obj-$(CONFIG_VIRT_DRIVERS) += virt/
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@ -0,0 +1,22 @@
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#
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# SoundWire subsystem configuration
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#
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menuconfig SOUNDWIRE
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bool "SoundWire support"
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---help---
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SoundWire is a 2-Pin interface with data and clock line ratified
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by the MIPI Alliance. SoundWire is used for transporting data
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typically related to audio functions. SoundWire interface is
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optimized to integrate audio devices in mobile or mobile inspired
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systems. Say Y to enable this subsystem, N if you do not have such
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a device
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if SOUNDWIRE
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comment "SoundWire Devices"
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config SOUNDWIRE_BUS
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tristate
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endif
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@ -0,0 +1,7 @@
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#
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# Makefile for soundwire core
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#
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#Bus Objs
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soundwire-bus-objs := bus_type.o
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obj-$(CONFIG_SOUNDWIRE_BUS) += soundwire-bus.o
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@ -0,0 +1,172 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright(c) 2015-17 Intel Corporation.
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/pm_domain.h>
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#include <linux/soundwire/sdw.h>
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#include <linux/soundwire/sdw_type.h>
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/**
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* sdw_get_device_id - find the matching SoundWire device id
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* @slave: SoundWire Slave Device
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* @drv: SoundWire Slave Driver
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*
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* The match is done by comparing the mfg_id and part_id from the
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* struct sdw_device_id.
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*/
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static const struct sdw_device_id *
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sdw_get_device_id(struct sdw_slave *slave, struct sdw_driver *drv)
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{
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const struct sdw_device_id *id = drv->id_table;
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while (id && id->mfg_id) {
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if (slave->id.mfg_id == id->mfg_id &&
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slave->id.part_id == id->part_id)
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return id;
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id++;
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}
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return NULL;
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}
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static int sdw_bus_match(struct device *dev, struct device_driver *ddrv)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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struct sdw_driver *drv = drv_to_sdw_driver(ddrv);
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return !!sdw_get_device_id(slave, drv);
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}
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int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size)
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{
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/* modalias is sdw:m<mfg_id>p<part_id> */
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return snprintf(buf, size, "sdw:m%04Xp%04X\n",
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slave->id.mfg_id, slave->id.part_id);
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}
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static int sdw_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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char modalias[32];
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sdw_slave_modalias(slave, modalias, sizeof(modalias));
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if (add_uevent_var(env, "MODALIAS=%s", modalias))
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return -ENOMEM;
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return 0;
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}
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struct bus_type sdw_bus_type = {
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.name = "soundwire",
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.match = sdw_bus_match,
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.uevent = sdw_uevent,
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};
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EXPORT_SYMBOL_GPL(sdw_bus_type);
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static int sdw_drv_probe(struct device *dev)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
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const struct sdw_device_id *id;
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int ret;
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id = sdw_get_device_id(slave, drv);
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if (!id)
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return -ENODEV;
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/*
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* attach to power domain but don't turn on (last arg)
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*/
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ret = dev_pm_domain_attach(dev, false);
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if (ret != -EPROBE_DEFER) {
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ret = drv->probe(slave, id);
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if (ret) {
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dev_err(dev, "Probe of %s failed: %d\n", drv->name, ret);
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dev_pm_domain_detach(dev, false);
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}
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}
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return ret;
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}
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static int sdw_drv_remove(struct device *dev)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
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int ret = 0;
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if (drv->remove)
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ret = drv->remove(slave);
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dev_pm_domain_detach(dev, false);
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return ret;
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}
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static void sdw_drv_shutdown(struct device *dev)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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struct sdw_driver *drv = drv_to_sdw_driver(dev->driver);
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if (drv->shutdown)
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drv->shutdown(slave);
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}
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/**
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* __sdw_register_driver() - register a SoundWire Slave driver
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* @drv: driver to register
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* @owner: owning module/driver
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*
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* Return: zero on success, else a negative error code.
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*/
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int __sdw_register_driver(struct sdw_driver *drv, struct module *owner)
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{
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drv->driver.bus = &sdw_bus_type;
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if (!drv->probe) {
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pr_err("driver %s didn't provide SDW probe routine\n",
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drv->name);
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return -EINVAL;
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}
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drv->driver.owner = owner;
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drv->driver.probe = sdw_drv_probe;
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if (drv->remove)
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drv->driver.remove = sdw_drv_remove;
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if (drv->shutdown)
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drv->driver.shutdown = sdw_drv_shutdown;
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return driver_register(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(__sdw_register_driver);
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/**
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* sdw_unregister_driver() - unregisters the SoundWire Slave driver
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* @drv: driver to unregister
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*/
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void sdw_unregister_driver(struct sdw_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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EXPORT_SYMBOL_GPL(sdw_unregister_driver);
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static int __init sdw_bus_init(void)
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{
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return bus_register(&sdw_bus_type);
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}
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static void __exit sdw_bus_exit(void)
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{
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bus_unregister(&sdw_bus_type);
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}
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postcore_initcall(sdw_bus_init);
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module_exit(sdw_bus_exit);
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MODULE_DESCRIPTION("SoundWire bus");
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MODULE_LICENSE("GPL v2");
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@ -229,6 +229,12 @@ struct hda_device_id {
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unsigned long driver_data;
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};
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struct sdw_device_id {
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__u16 mfg_id;
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__u16 part_id;
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kernel_ulong_t driver_data;
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};
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/*
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* Struct used for matching a device
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*/
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@ -0,0 +1,108 @@
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// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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// Copyright(c) 2015-17 Intel Corporation.
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#ifndef __SOUNDWIRE_H
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#define __SOUNDWIRE_H
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struct sdw_bus;
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struct sdw_slave;
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#define SDW_MAX_DEVICES 11
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/**
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* enum sdw_slave_status - Slave status
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* @SDW_SLAVE_UNATTACHED: Slave is not attached with the bus.
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* @SDW_SLAVE_ATTACHED: Slave is attached with bus.
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* @SDW_SLAVE_ALERT: Some alert condition on the Slave
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* @SDW_SLAVE_RESERVED: Reserved for future use
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*/
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enum sdw_slave_status {
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SDW_SLAVE_UNATTACHED = 0,
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SDW_SLAVE_ATTACHED = 1,
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SDW_SLAVE_ALERT = 2,
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SDW_SLAVE_RESERVED = 3,
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};
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/*
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* SDW Slave Structures and APIs
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*/
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/**
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* struct sdw_slave_id - Slave ID
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* @mfg_id: MIPI Manufacturer ID
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* @part_id: Device Part ID
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* @class_id: MIPI Class ID, unused now.
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* Currently a placeholder in MIPI SoundWire Spec
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* @unique_id: Device unique ID
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* @sdw_version: SDW version implemented
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*
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* The order of the IDs here does not follow the DisCo spec definitions
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*/
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struct sdw_slave_id {
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__u16 mfg_id;
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__u16 part_id;
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__u8 class_id;
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__u8 unique_id:4;
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__u8 sdw_version:4;
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};
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/**
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* struct sdw_slave - SoundWire Slave
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* @id: MIPI device ID
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* @dev: Linux device
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* @status: Status reported by the Slave
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* @bus: Bus handle
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* @node: node for bus list
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* @dev_num: Device Number assigned by Bus
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*/
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struct sdw_slave {
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struct sdw_slave_id id;
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struct device dev;
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enum sdw_slave_status status;
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struct sdw_bus *bus;
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struct list_head node;
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u16 dev_num;
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};
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#define dev_to_sdw_dev(_dev) container_of(_dev, struct sdw_slave, dev)
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struct sdw_driver {
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const char *name;
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int (*probe)(struct sdw_slave *sdw,
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const struct sdw_device_id *id);
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int (*remove)(struct sdw_slave *sdw);
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void (*shutdown)(struct sdw_slave *sdw);
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const struct sdw_device_id *id_table;
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const struct sdw_slave_ops *ops;
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struct device_driver driver;
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};
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#define SDW_SLAVE_ENTRY(_mfg_id, _part_id, _drv_data) \
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{ .mfg_id = (_mfg_id), .part_id = (_part_id), \
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.driver_data = (unsigned long)(_drv_data) }
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/*
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* SDW master structures and APIs
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*/
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/**
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* struct sdw_bus - SoundWire bus
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* @dev: Master linux device
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* @link_id: Link id number, can be 0 to N, unique for each Master
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* @slaves: list of Slaves on this bus
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* @assigned: Bitmap for Slave device numbers.
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* Bit set implies used number, bit clear implies unused number.
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* @bus_lock: bus lock
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*/
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struct sdw_bus {
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struct device *dev;
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unsigned int link_id;
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struct list_head slaves;
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DECLARE_BITMAP(assigned, SDW_MAX_DEVICES);
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struct mutex bus_lock;
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};
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#endif /* __SOUNDWIRE_H */
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@ -0,0 +1,19 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright(c) 2015-17 Intel Corporation.
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#ifndef __SOUNDWIRE_TYPES_H
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#define __SOUNDWIRE_TYPES_H
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extern struct bus_type sdw_bus_type;
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#define drv_to_sdw_driver(_drv) container_of(_drv, struct sdw_driver, driver)
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#define sdw_register_driver(drv) \
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__sdw_register_driver(drv, THIS_MODULE)
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int __sdw_register_driver(struct sdw_driver *drv, struct module *);
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void sdw_unregister_driver(struct sdw_driver *drv);
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int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size);
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#endif /* __SOUNDWIRE_TYPES_H */
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@ -203,6 +203,10 @@ int main(void)
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DEVID_FIELD(hda_device_id, rev_id);
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DEVID_FIELD(hda_device_id, api_version);
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DEVID(sdw_device_id);
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DEVID_FIELD(sdw_device_id, mfg_id);
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DEVID_FIELD(sdw_device_id, part_id);
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DEVID(fsl_mc_device_id);
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DEVID_FIELD(fsl_mc_device_id, vendor);
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DEVID_FIELD(fsl_mc_device_id, obj_type);
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@ -1289,6 +1289,21 @@ static int do_hda_entry(const char *filename, void *symval, char *alias)
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}
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ADD_TO_DEVTABLE("hdaudio", hda_device_id, do_hda_entry);
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/* Looks like: sdw:mNpN */
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static int do_sdw_entry(const char *filename, void *symval, char *alias)
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{
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DEF_FIELD(symval, sdw_device_id, mfg_id);
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DEF_FIELD(symval, sdw_device_id, part_id);
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strcpy(alias, "sdw:");
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ADD(alias, "m", mfg_id != 0, mfg_id);
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ADD(alias, "p", part_id != 0, part_id);
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add_wildcard(alias);
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return 1;
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}
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ADD_TO_DEVTABLE("sdw", sdw_device_id, do_sdw_entry);
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/* Looks like: fsl-mc:vNdN */
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static int do_fsl_mc_entry(const char *filename, void *symval,
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char *alias)
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Reference in New Issue