// 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_xfers() - do I3C transfers directed to a specific device * * @dev: device with which the transfers should be done * @xfers: array of transfers * @nxfers: number of transfers * @mode: transfer mode * * 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. * * -EAGAIN: controller lost address arbitration. Target (IBI, HJ or *   controller role request) win the bus. Client driver needs to resend the *   'xfers' some time later. See I3C spec ver 1.1.1 09-Jun-2021. Section: *   5.1.2.2.3. */int i3c_device_do_xfers(struct i3c_device *dev, struct i3c_xfer *xfers,			int nxfers, enum i3c_xfer_mode mode){	int ret, i; 	if (nxfers < 1)		return 0; 	for (i = 0; i < nxfers; i++) {		if (!xfers[i].len || !xfers[i].data.in)			return -EINVAL;	} 	ret = i3c_bus_rpm_get(dev->bus);	if (ret)		return ret; 	i3c_bus_normaluse_lock(dev->bus);	ret = i3c_dev_do_xfers_locked(dev->desc, xfers, nxfers, mode);	i3c_bus_normaluse_unlock(dev->bus); 	i3c_bus_rpm_put(dev->bus); 	return ret;}EXPORT_SYMBOL_GPL(i3c_device_do_xfers); /** * i3c_device_do_setdasa() - do I3C dynamic address assignement with *                           static address * * @dev: device with which the DAA should be done * * Return: 0 in case of success, a negative error core otherwise. */int i3c_device_do_setdasa(struct i3c_device *dev){	int ret; 	ret = i3c_bus_rpm_get(dev->bus);	if (ret)		return ret; 	i3c_bus_normaluse_lock(dev->bus);	ret = i3c_dev_setdasa_locked(dev->desc);	i3c_bus_normaluse_unlock(dev->bus); 	i3c_bus_rpm_put(dev->bus); 	return ret;}EXPORT_SYMBOL_GPL(i3c_device_do_setdasa); /** * 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(const struct i3c_device *dev,			 struct i3c_device_info *info){	if (!info)		return; 	i3c_bus_normaluse_lock(dev->bus);	*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; 	if (i3c_bus_rpm_ibi_allowed(dev->bus)) {		ret = i3c_bus_rpm_get(dev->bus);		if (ret)			return ret;	} 	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);	} else {		ret = -ENOENT;	}	i3c_bus_normaluse_unlock(dev->bus); 	if (!ret || i3c_bus_rpm_ibi_allowed(dev->bus))		i3c_bus_rpm_put(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; 	ret = i3c_bus_rpm_get(dev->bus);	if (ret)		return ret; 	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);	} else {		ret = -ENOENT;	}	i3c_bus_normaluse_unlock(dev->bus); 	if (ret || i3c_bus_rpm_ibi_allowed(dev->bus))		i3c_bus_rpm_put(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; 	if (!req->handler || !req->num_slots)		return -EINVAL; 	ret = i3c_bus_rpm_get(dev->bus);	if (ret)		return ret; 	i3c_bus_normaluse_lock(dev->bus);	if (!dev->desc) {		ret = -ENOENT;	} else if (!(dev->desc->info.bcr & I3C_BCR_IBI_REQ_CAP)) {		ret = -EOPNOTSUPP;	} else {		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); 	i3c_bus_rpm_put(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); /** * 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_device_get_supported_xfer_mode - Returns the supported transfer mode by *					connected master controller. * @dev: I3C device * * Return: a bit mask, which supported transfer mode, bit position is defined at *	   enum i3c_hdr_mode */u32 i3c_device_get_supported_xfer_mode(struct i3c_device *dev){	return i3c_bus_to_i3c_master(dev->bus)->this->info.hdr_cap | BIT(I3C_SDR);}EXPORT_SYMBOL_GPL(i3c_device_get_supported_xfer_mode); /** * 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; 	if (!drv->probe) {		pr_err("Trying to register an i3c driver without probe callback\n");		return -EINVAL;	} 	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);