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authorLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 03:55:35 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-04-05 03:55:35 +0300
commitac9053d2dcb9e8c3fa35ce458dfca8fddc141680 (patch)
tree3ffa30d58dac22ee0a80e2dd32f41b71da91132b /drivers/base
parentf9ca6a561d40115696a54f16085c4edb17effc74 (diff)
parent5267c5e09c25e2ee6242b37833a9bdf9d97f54a2 (diff)
downloadlinux-ac9053d2dcb9e8c3fa35ce458dfca8fddc141680.tar.xz
Merge tag 'usb-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB/PHY updates from Greg KH: "Here is the big set of USB and PHY driver patches for 4.17-rc1. Lots of USB typeC work happened this round, with code moving from the staging directory into the "real" part of the kernel, as well as new infrastructure being added to be able to handle the different types of "roles" that typeC requires. There is also the normal huge set of USB gadget controller and driver updates, along with XHCI changes, and a raft of other tiny fixes all over the USB tree. And the PHY driver updates are merged in here as well as they interacted with the USB drivers in some places. All of these have been in linux-next for a while with no reported issues" * tag 'usb-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (250 commits) Revert "USB: serial: ftdi_sio: add Id for Physik Instrumente E-870" usb: musb: gadget: misplaced out of bounds check usb: chipidea: imx: Fix ULPI on imx53 usb: chipidea: imx: Cleanup ci_hdrc_imx_platform_flag usb: chipidea: usbmisc: small clean up usb: chipidea: usbmisc: evdo can be set e/o reset usb: chipidea: usbmisc: evdo is only specific to OTG port USB: serial: ftdi_sio: add Id for Physik Instrumente E-870 usb: dwc3: gadget: never call ->complete() from ->ep_queue() usb: gadget: udc: core: update usb_ep_queue() documentation usb: host: Remove the deprecated ATH79 USB host config options usb: roles: Fix return value check in intel_xhci_usb_probe() USB: gadget: f_midi: fixing a possible double-free in f_midi usb: core: Add USB_QUIRK_DELAY_CTRL_MSG to usbcore quirks usb: core: Copy parameter string correctly and remove superfluous null check USB: announce bcdDevice as well as idVendor, idProduct. USB:fix USB3 devices behind USB3 hubs not resuming at hibernate thaw usb: hub: Reduce warning to notice on power loss USB: serial: ftdi_sio: add support for Harman FirmwareHubEmulator USB: serial: cp210x: add ELDAT Easywave RX09 id ...
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/Makefile3
-rw-r--r--drivers/base/devcon.c136
2 files changed, 138 insertions, 1 deletions
diff --git a/drivers/base/Makefile b/drivers/base/Makefile
index e32a52490051..12a7f64d35a9 100644
--- a/drivers/base/Makefile
+++ b/drivers/base/Makefile
@@ -5,7 +5,8 @@ obj-y := component.o core.o bus.o dd.o syscore.o \
driver.o class.o platform.o \
cpu.o firmware.o init.o map.o devres.o \
attribute_container.o transport_class.o \
- topology.o container.o property.o cacheinfo.o
+ topology.o container.o property.o cacheinfo.o \
+ devcon.o
obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
obj-$(CONFIG_DMA_CMA) += dma-contiguous.o
obj-y += power/
diff --git a/drivers/base/devcon.c b/drivers/base/devcon.c
new file mode 100644
index 000000000000..d427e806cd73
--- /dev/null
+++ b/drivers/base/devcon.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+/**
+ * Device connections
+ *
+ * Copyright (C) 2018 Intel Corporation
+ * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
+ */
+
+#include <linux/device.h>
+
+static DEFINE_MUTEX(devcon_lock);
+static LIST_HEAD(devcon_list);
+
+/**
+ * device_connection_find_match - Find physical connection to a device
+ * @dev: Device with the connection
+ * @con_id: Identifier for the connection
+ * @data: Data for the match function
+ * @match: Function to check and convert the connection description
+ *
+ * Find a connection with unique identifier @con_id between @dev and another
+ * device. @match will be used to convert the connection description to data the
+ * caller is expecting to be returned.
+ */
+void *device_connection_find_match(struct device *dev, const char *con_id,
+ void *data,
+ void *(*match)(struct device_connection *con,
+ int ep, void *data))
+{
+ const char *devname = dev_name(dev);
+ struct device_connection *con;
+ void *ret = NULL;
+ int ep;
+
+ if (!match)
+ return NULL;
+
+ mutex_lock(&devcon_lock);
+
+ list_for_each_entry(con, &devcon_list, list) {
+ ep = match_string(con->endpoint, 2, devname);
+ if (ep < 0)
+ continue;
+
+ if (con_id && strcmp(con->id, con_id))
+ continue;
+
+ ret = match(con, !ep, data);
+ if (ret)
+ break;
+ }
+
+ mutex_unlock(&devcon_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(device_connection_find_match);
+
+extern struct bus_type platform_bus_type;
+extern struct bus_type pci_bus_type;
+extern struct bus_type i2c_bus_type;
+extern struct bus_type spi_bus_type;
+
+static struct bus_type *generic_match_buses[] = {
+ &platform_bus_type,
+#ifdef CONFIG_PCI
+ &pci_bus_type,
+#endif
+#ifdef CONFIG_I2C
+ &i2c_bus_type,
+#endif
+#ifdef CONFIG_SPI_MASTER
+ &spi_bus_type,
+#endif
+ NULL,
+};
+
+/* This tries to find the device from the most common bus types by name. */
+static void *generic_match(struct device_connection *con, int ep, void *data)
+{
+ struct bus_type *bus;
+ struct device *dev;
+
+ for (bus = generic_match_buses[0]; bus; bus++) {
+ dev = bus_find_device_by_name(bus, NULL, con->endpoint[ep]);
+ if (dev)
+ return dev;
+ }
+
+ /*
+ * We only get called if a connection was found, tell the caller to
+ * wait for the other device to show up.
+ */
+ return ERR_PTR(-EPROBE_DEFER);
+}
+
+/**
+ * device_connection_find - Find two devices connected together
+ * @dev: Device with the connection
+ * @con_id: Identifier for the connection
+ *
+ * Find a connection with unique identifier @con_id between @dev and
+ * another device. On success returns handle to the device that is connected
+ * to @dev, with the reference count for the found device incremented. Returns
+ * NULL if no matching connection was found, or ERR_PTR(-EPROBE_DEFER) when a
+ * connection was found but the other device has not been enumerated yet.
+ */
+struct device *device_connection_find(struct device *dev, const char *con_id)
+{
+ return device_connection_find_match(dev, con_id, NULL, generic_match);
+}
+EXPORT_SYMBOL_GPL(device_connection_find);
+
+/**
+ * device_connection_add - Register a connection description
+ * @con: The connection description to be registered
+ */
+void device_connection_add(struct device_connection *con)
+{
+ mutex_lock(&devcon_lock);
+ list_add_tail(&con->list, &devcon_list);
+ mutex_unlock(&devcon_lock);
+}
+EXPORT_SYMBOL_GPL(device_connection_add);
+
+/**
+ * device_connections_remove - Unregister connection description
+ * @con: The connection description to be unregistered
+ */
+void device_connection_remove(struct device_connection *con)
+{
+ mutex_lock(&devcon_lock);
+ list_del(&con->list);
+ mutex_unlock(&devcon_lock);
+}
+EXPORT_SYMBOL_GPL(device_connection_remove);