// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2018 Cadence Design Systems Inc. * * Author: Boris Brezillon <boris.brezillon@bootlin.com> */ #include <linux/atomic.h> #include <linux/bug.h> #include <linux/completion.h> #include <linux/device.h> #include <linux/mutex.h> #include <linux/slab.h> #include "internals.h" /** * i3c_device_do_priv_xfers() - do I3C SDR private transfers directed to a * specific device * * @dev: device with which the transfers should be done * @xfers: array of transfers * @nxfers: number of transfers * * Initiate one or several private SDR transfers with @dev. * * This function can sleep and thus cannot be called in atomic context. * * Return: 0 in case of success, a negative error core otherwise. */ int i3c_device_do_priv_xfers(struct i3c_device *dev, struct i3c_priv_xfer *xfers, int nxfers) { int ret, i; if (nxfers < 1) return 0; for (i = 0; i < nxfers; i++) { if (!xfers[i].len || !xfers[i].data.in) return -EINVAL; } i3c_bus_normaluse_lock(dev->bus); ret = i3c_dev_do_priv_xfers_locked(dev->desc, xfers, nxfers); i3c_bus_normaluse_unlock(dev->bus); return ret; } EXPORT_SYMBOL_GPL(i3c_device_do_priv_xfers); /** * i3c_device_get_info() - get I3C device information * * @dev: device we want information on * @info: the information object to fill in * * Retrieve I3C dev info. */ void i3c_device_get_info(struct i3c_device *dev, struct i3c_device_info *info) { if (!info) return; i3c_bus_normaluse_lock(dev->bus); if (dev->desc) *info = dev->desc->info; i3c_bus_normaluse_unlock(dev->bus); } EXPORT_SYMBOL_GPL(i3c_device_get_info); /** * i3c_device_disable_ibi() - Disable IBIs coming from a specific device * @dev: device on which IBIs should be disabled * * This function disable IBIs coming from a specific device and wait for * all pending IBIs to be processed. * * Return: 0 in case of success, a negative error core otherwise. */ int i3c_device_disable_ibi(struct i3c_device *dev) { int ret = -ENOENT; i3c_bus_normaluse_lock(dev->bus); if (dev->desc) { mutex_lock(&dev->desc->ibi_lock); ret = i3c_dev_disable_ibi_locked(dev->desc); mutex_unlock(&dev->desc->ibi_lock); } i3c_bus_normaluse_unlock(dev->bus); return ret; } EXPORT_SYMBOL_GPL(i3c_device_disable_ibi); /** * i3c_device_enable_ibi() - Enable IBIs coming from a specific device * @dev: device on which IBIs should be enabled * * This function enable IBIs coming from a specific device and wait for * all pending IBIs to be processed. This should be called on a device * where i3c_device_request_ibi() has succeeded. * * Note that IBIs from this device might be received before this function * returns to its caller. * * Return: 0 in case of success, a negative error core otherwise. */ int i3c_device_enable_ibi(struct i3c_device *dev) { int ret = -ENOENT; i3c_bus_normaluse_lock(dev->bus); if (dev->desc) { mutex_lock(&dev->desc->ibi_lock); ret = i3c_dev_enable_ibi_locked(dev->desc); mutex_unlock(&dev->desc->ibi_lock); } i3c_bus_normaluse_unlock(dev->bus); return ret; } EXPORT_SYMBOL_GPL(i3c_device_enable_ibi); /** * i3c_device_request_ibi() - Request an IBI * @dev: device for which we should enable IBIs * @req: setup requested for this IBI * * This function is responsible for pre-allocating all resources needed to * process IBIs coming from @dev. When this function returns, the IBI is not * enabled until i3c_device_enable_ibi() is called. * * Return: 0 in case of success, a negative error core otherwise. */ int i3c_device_request_ibi(struct i3c_device *dev, const struct i3c_ibi_setup *req) { int ret = -ENOENT; if (!req->handler || !req->num_slots) return -EINVAL; i3c_bus_normaluse_lock(dev->bus); if (dev->desc) { mutex_lock(&dev->desc->ibi_lock); ret = i3c_dev_request_ibi_locked(dev->desc, req); mutex_unlock(&dev->desc->ibi_lock); } i3c_bus_normaluse_unlock(dev->bus); return ret; } EXPORT_SYMBOL_GPL(i3c_device_request_ibi); /** * i3c_device_free_ibi() - Free all resources needed for IBI handling * @dev: device on which you want to release IBI resources * * This function is responsible for de-allocating resources previously * allocated by i3c_device_request_ibi(). It should be called after disabling * IBIs with i3c_device_disable_ibi(). */ void i3c_device_free_ibi(struct i3c_device *dev) { i3c_bus_normaluse_lock(dev->bus); if (dev->desc) { mutex_lock(&dev->desc->ibi_lock); i3c_dev_free_ibi_locked(dev->desc); mutex_unlock(&dev->desc->ibi_lock); } i3c_bus_normaluse_unlock(dev->bus); } EXPORT_SYMBOL_GPL(i3c_device_free_ibi); /** * i3cdev_to_dev() - Returns the device embedded in @i3cdev * @i3cdev: I3C device * * Return: a pointer to a device object. */ struct device *i3cdev_to_dev(struct i3c_device *i3cdev) { return &i3cdev->dev; } EXPORT_SYMBOL_GPL(i3cdev_to_dev); /** * dev_to_i3cdev() - Returns the I3C device containing @dev * @dev: device object * * Return: a pointer to an I3C device object. */ struct i3c_device *dev_to_i3cdev(struct device *dev) { return container_of(dev, struct i3c_device, dev); } EXPORT_SYMBOL_GPL(dev_to_i3cdev); /** * i3c_device_match_id() - Returns the i3c_device_id entry matching @i3cdev * @i3cdev: I3C device * @id_table: I3C device match table * * Return: a pointer to an i3c_device_id object or NULL if there's no match. */ const struct i3c_device_id * i3c_device_match_id(struct i3c_device *i3cdev, const struct i3c_device_id *id_table) { struct i3c_device_info devinfo; const struct i3c_device_id *id; u16 manuf, part, ext_info; bool rndpid; i3c_device_get_info(i3cdev, &devinfo); manuf = I3C_PID_MANUF_ID(devinfo.pid); part = I3C_PID_PART_ID(devinfo.pid); ext_info = I3C_PID_EXTRA_INFO(devinfo.pid); rndpid = I3C_PID_RND_LOWER_32BITS(devinfo.pid); for (id = id_table; id->match_flags != 0; id++) { if ((id->match_flags & I3C_MATCH_DCR) && id->dcr != devinfo.dcr) continue; if ((id->match_flags & I3C_MATCH_MANUF) && id->manuf_id != manuf) continue; if ((id->match_flags & I3C_MATCH_PART) && (rndpid || id->part_id != part)) continue; if ((id->match_flags & I3C_MATCH_EXTRA_INFO) && (rndpid || id->extra_info != ext_info)) continue; return id; } return NULL; } EXPORT_SYMBOL_GPL(i3c_device_match_id); /** * i3c_driver_register_with_owner() - register an I3C device driver * * @drv: driver to register * @owner: module that owns this driver * * Register @drv to the core. * * Return: 0 in case of success, a negative error core otherwise. */ int i3c_driver_register_with_owner(struct i3c_driver *drv, struct module *owner) { drv->driver.owner = owner; drv->driver.bus = &i3c_bus_type; return driver_register(&drv->driver); } EXPORT_SYMBOL_GPL(i3c_driver_register_with_owner); /** * i3c_driver_unregister() - unregister an I3C device driver * * @drv: driver to unregister * * Unregister @drv. */ void i3c_driver_unregister(struct i3c_driver *drv) { driver_unregister(&drv->driver); } EXPORT_SYMBOL_GPL(i3c_driver_unregister);