| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Boris Brezillon | 10556 | 99.98% | 1 | 33.33% |
| JiSheng Zhang | 1 | 0.01% | 1 | 33.33% |
| Dan Carpenter | 1 | 0.01% | 1 | 33.33% |
| Total | 10558 | 3 |
// 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/device.h> #include <linux/err.h> #include <linux/export.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/of.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/workqueue.h> #include "internals.h" static DEFINE_IDR(i3c_bus_idr); static DEFINE_MUTEX(i3c_core_lock); /** * i3c_bus_maintenance_lock - Lock the bus for a maintenance operation * @bus: I3C bus to take the lock on * * This function takes the bus lock so that no other operations can occur on * the bus. This is needed for all kind of bus maintenance operation, like * - enabling/disabling slave events * - re-triggering DAA * - changing the dynamic address of a device * - relinquishing mastership * - ... * * The reason for this kind of locking is that we don't want drivers and core * logic to rely on I3C device information that could be changed behind their * back. */ static void i3c_bus_maintenance_lock(struct i3c_bus *bus) { down_write(&bus->lock); } /** * i3c_bus_maintenance_unlock - Release the bus lock after a maintenance * operation * @bus: I3C bus to release the lock on * * Should be called when the bus maintenance operation is done. See * i3c_bus_maintenance_lock() for more details on what these maintenance * operations are. */ static void i3c_bus_maintenance_unlock(struct i3c_bus *bus) { up_write(&bus->lock); } /** * i3c_bus_normaluse_lock - Lock the bus for a normal operation * @bus: I3C bus to take the lock on * * This function takes the bus lock for any operation that is not a maintenance * operation (see i3c_bus_maintenance_lock() for a non-exhaustive list of * maintenance operations). Basically all communications with I3C devices are * normal operations (HDR, SDR transfers or CCC commands that do not change bus * state or I3C dynamic address). * * Note that this lock is not guaranteeing serialization of normal operations. * In other words, transfer requests passed to the I3C master can be submitted * in parallel and I3C master drivers have to use their own locking to make * sure two different communications are not inter-mixed, or access to the * output/input queue is not done while the engine is busy. */ void i3c_bus_normaluse_lock(struct i3c_bus *bus) { down_read(&bus->lock); } /** * i3c_bus_normaluse_unlock - Release the bus lock after a normal operation * @bus: I3C bus to release the lock on * * Should be called when a normal operation is done. See * i3c_bus_normaluse_lock() for more details on what these normal operations * are. */ void i3c_bus_normaluse_unlock(struct i3c_bus *bus) { up_read(&bus->lock); } static struct i3c_master_controller *dev_to_i3cmaster(struct device *dev) { return container_of(dev, struct i3c_master_controller, dev); } static const struct device_type i3c_device_type; static struct i3c_bus *dev_to_i3cbus(struct device *dev) { struct i3c_master_controller *master; if (dev->type == &i3c_device_type) return dev_to_i3cdev(dev)->bus; master = dev_to_i3cmaster(dev); return &master->bus; } static struct i3c_dev_desc *dev_to_i3cdesc(struct device *dev) { struct i3c_master_controller *master; if (dev->type == &i3c_device_type) return dev_to_i3cdev(dev)->desc; master = container_of(dev, struct i3c_master_controller, dev); return master->this; } static ssize_t bcr_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *bus = dev_to_i3cbus(dev); struct i3c_dev_desc *desc; ssize_t ret; i3c_bus_normaluse_lock(bus); desc = dev_to_i3cdesc(dev); ret = sprintf(buf, "%x\n", desc->info.bcr); i3c_bus_normaluse_unlock(bus); return ret; } static DEVICE_ATTR_RO(bcr); static ssize_t dcr_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *bus = dev_to_i3cbus(dev); struct i3c_dev_desc *desc; ssize_t ret; i3c_bus_normaluse_lock(bus); desc = dev_to_i3cdesc(dev); ret = sprintf(buf, "%x\n", desc->info.dcr); i3c_bus_normaluse_unlock(bus); return ret; } static DEVICE_ATTR_RO(dcr); static ssize_t pid_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *bus = dev_to_i3cbus(dev); struct i3c_dev_desc *desc; ssize_t ret; i3c_bus_normaluse_lock(bus); desc = dev_to_i3cdesc(dev); ret = sprintf(buf, "%llx\n", desc->info.pid); i3c_bus_normaluse_unlock(bus); return ret; } static DEVICE_ATTR_RO(pid); static ssize_t dynamic_address_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *bus = dev_to_i3cbus(dev); struct i3c_dev_desc *desc; ssize_t ret; i3c_bus_normaluse_lock(bus); desc = dev_to_i3cdesc(dev); ret = sprintf(buf, "%02x\n", desc->info.dyn_addr); i3c_bus_normaluse_unlock(bus); return ret; } static DEVICE_ATTR_RO(dynamic_address); static const char * const hdrcap_strings[] = { "hdr-ddr", "hdr-tsp", "hdr-tsl", }; static ssize_t hdrcap_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *bus = dev_to_i3cbus(dev); struct i3c_dev_desc *desc; ssize_t offset = 0, ret; unsigned long caps; int mode; i3c_bus_normaluse_lock(bus); desc = dev_to_i3cdesc(dev); caps = desc->info.hdr_cap; for_each_set_bit(mode, &caps, 8) { if (mode >= ARRAY_SIZE(hdrcap_strings)) break; if (!hdrcap_strings[mode]) continue; ret = sprintf(buf + offset, offset ? " %s" : "%s", hdrcap_strings[mode]); if (ret < 0) goto out; offset += ret; } ret = sprintf(buf + offset, "\n"); if (ret < 0) goto out; ret = offset + ret; out: i3c_bus_normaluse_unlock(bus); return ret; } static DEVICE_ATTR_RO(hdrcap); static struct attribute *i3c_device_attrs[] = { &dev_attr_bcr.attr, &dev_attr_dcr.attr, &dev_attr_pid.attr, &dev_attr_dynamic_address.attr, &dev_attr_hdrcap.attr, NULL, }; ATTRIBUTE_GROUPS(i3c_device); static int i3c_device_uevent(struct device *dev, struct kobj_uevent_env *env) { struct i3c_device *i3cdev = dev_to_i3cdev(dev); struct i3c_device_info devinfo; u16 manuf, part, ext; i3c_device_get_info(i3cdev, &devinfo); manuf = I3C_PID_MANUF_ID(devinfo.pid); part = I3C_PID_PART_ID(devinfo.pid); ext = I3C_PID_EXTRA_INFO(devinfo.pid); if (I3C_PID_RND_LOWER_32BITS(devinfo.pid)) return add_uevent_var(env, "MODALIAS=i3c:dcr%02Xmanuf%04X", devinfo.dcr, manuf); return add_uevent_var(env, "MODALIAS=i3c:dcr%02Xmanuf%04Xpart%04xext%04x", devinfo.dcr, manuf, part, ext); } static const struct device_type i3c_device_type = { .groups = i3c_device_groups, .uevent = i3c_device_uevent, }; static 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; i3c_device_get_info(i3cdev, &devinfo); /* * The lower 32bits of the provisional ID is just filled with a random * value, try to match using DCR info. */ if (!I3C_PID_RND_LOWER_32BITS(devinfo.pid)) { u16 manuf = I3C_PID_MANUF_ID(devinfo.pid); u16 part = I3C_PID_PART_ID(devinfo.pid); u16 ext_info = I3C_PID_EXTRA_INFO(devinfo.pid); /* First try to match by manufacturer/part ID. */ for (id = id_table; id->match_flags != 0; id++) { if ((id->match_flags & I3C_MATCH_MANUF_AND_PART) != I3C_MATCH_MANUF_AND_PART) continue; if (manuf != id->manuf_id || part != id->part_id) continue; if ((id->match_flags & I3C_MATCH_EXTRA_INFO) && ext_info != id->extra_info) continue; return id; } } /* Fallback to DCR match. */ for (id = id_table; id->match_flags != 0; id++) { if ((id->match_flags & I3C_MATCH_DCR) && id->dcr == devinfo.dcr) return id; } return NULL; } static int i3c_device_match(struct device *dev, struct device_driver *drv) { struct i3c_device *i3cdev; struct i3c_driver *i3cdrv; if (dev->type != &i3c_device_type) return 0; i3cdev = dev_to_i3cdev(dev); i3cdrv = drv_to_i3cdrv(drv); if (i3c_device_match_id(i3cdev, i3cdrv->id_table)) return 1; return 0; } static int i3c_device_probe(struct device *dev) { struct i3c_device *i3cdev = dev_to_i3cdev(dev); struct i3c_driver *driver = drv_to_i3cdrv(dev->driver); return driver->probe(i3cdev); } static int i3c_device_remove(struct device *dev) { struct i3c_device *i3cdev = dev_to_i3cdev(dev); struct i3c_driver *driver = drv_to_i3cdrv(dev->driver); int ret; ret = driver->remove(i3cdev); if (ret) return ret; i3c_device_free_ibi(i3cdev); return ret; } struct bus_type i3c_bus_type = { .name = "i3c", .match = i3c_device_match, .probe = i3c_device_probe, .remove = i3c_device_remove, }; static enum i3c_addr_slot_status i3c_bus_get_addr_slot_status(struct i3c_bus *bus, u16 addr) { int status, bitpos = addr * 2; if (addr > I2C_MAX_ADDR) return I3C_ADDR_SLOT_RSVD; status = bus->addrslots[bitpos / BITS_PER_LONG]; status >>= bitpos % BITS_PER_LONG; return status & I3C_ADDR_SLOT_STATUS_MASK; } static void i3c_bus_set_addr_slot_status(struct i3c_bus *bus, u16 addr, enum i3c_addr_slot_status status) { int bitpos = addr * 2; unsigned long *ptr; if (addr > I2C_MAX_ADDR) return; ptr = bus->addrslots + (bitpos / BITS_PER_LONG); *ptr &= ~(I3C_ADDR_SLOT_STATUS_MASK << (bitpos % BITS_PER_LONG)); *ptr |= status << (bitpos % BITS_PER_LONG); } static bool i3c_bus_dev_addr_is_avail(struct i3c_bus *bus, u8 addr) { enum i3c_addr_slot_status status; status = i3c_bus_get_addr_slot_status(bus, addr); return status == I3C_ADDR_SLOT_FREE; } static int i3c_bus_get_free_addr(struct i3c_bus *bus, u8 start_addr) { enum i3c_addr_slot_status status; u8 addr; for (addr = start_addr; addr < I3C_MAX_ADDR; addr++) { status = i3c_bus_get_addr_slot_status(bus, addr); if (status == I3C_ADDR_SLOT_FREE) return addr; } return -ENOMEM; } static void i3c_bus_init_addrslots(struct i3c_bus *bus) { int i; /* Addresses 0 to 7 are reserved. */ for (i = 0; i < 8; i++) i3c_bus_set_addr_slot_status(bus, i, I3C_ADDR_SLOT_RSVD); /* * Reserve broadcast address and all addresses that might collide * with the broadcast address when facing a single bit error. */ i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR, I3C_ADDR_SLOT_RSVD); for (i = 0; i < 7; i++) i3c_bus_set_addr_slot_status(bus, I3C_BROADCAST_ADDR ^ BIT(i), I3C_ADDR_SLOT_RSVD); } static void i3c_bus_cleanup(struct i3c_bus *i3cbus) { mutex_lock(&i3c_core_lock); idr_remove(&i3c_bus_idr, i3cbus->id); mutex_unlock(&i3c_core_lock); } static int i3c_bus_init(struct i3c_bus *i3cbus) { int ret; init_rwsem(&i3cbus->lock); INIT_LIST_HEAD(&i3cbus->devs.i2c); INIT_LIST_HEAD(&i3cbus->devs.i3c); i3c_bus_init_addrslots(i3cbus); i3cbus->mode = I3C_BUS_MODE_PURE; mutex_lock(&i3c_core_lock); ret = idr_alloc(&i3c_bus_idr, i3cbus, 0, 0, GFP_KERNEL); mutex_unlock(&i3c_core_lock); if (ret < 0) return ret; i3cbus->id = ret; return 0; } static const char * const i3c_bus_mode_strings[] = { [I3C_BUS_MODE_PURE] = "pure", [I3C_BUS_MODE_MIXED_FAST] = "mixed-fast", [I3C_BUS_MODE_MIXED_SLOW] = "mixed-slow", }; static ssize_t mode_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *i3cbus = dev_to_i3cbus(dev); ssize_t ret; i3c_bus_normaluse_lock(i3cbus); if (i3cbus->mode < 0 || i3cbus->mode >= ARRAY_SIZE(i3c_bus_mode_strings) || !i3c_bus_mode_strings[i3cbus->mode]) ret = sprintf(buf, "unknown\n"); else ret = sprintf(buf, "%s\n", i3c_bus_mode_strings[i3cbus->mode]); i3c_bus_normaluse_unlock(i3cbus); return ret; } static DEVICE_ATTR_RO(mode); static ssize_t current_master_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *i3cbus = dev_to_i3cbus(dev); ssize_t ret; i3c_bus_normaluse_lock(i3cbus); ret = sprintf(buf, "%d-%llx\n", i3cbus->id, i3cbus->cur_master->info.pid); i3c_bus_normaluse_unlock(i3cbus); return ret; } static DEVICE_ATTR_RO(current_master); static ssize_t i3c_scl_frequency_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *i3cbus = dev_to_i3cbus(dev); ssize_t ret; i3c_bus_normaluse_lock(i3cbus); ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i3c); i3c_bus_normaluse_unlock(i3cbus); return ret; } static DEVICE_ATTR_RO(i3c_scl_frequency); static ssize_t i2c_scl_frequency_show(struct device *dev, struct device_attribute *da, char *buf) { struct i3c_bus *i3cbus = dev_to_i3cbus(dev); ssize_t ret; i3c_bus_normaluse_lock(i3cbus); ret = sprintf(buf, "%ld\n", i3cbus->scl_rate.i2c); i3c_bus_normaluse_unlock(i3cbus); return ret; } static DEVICE_ATTR_RO(i2c_scl_frequency); static struct attribute *i3c_masterdev_attrs[] = { &dev_attr_mode.attr, &dev_attr_current_master.attr, &dev_attr_i3c_scl_frequency.attr, &dev_attr_i2c_scl_frequency.attr, &dev_attr_bcr.attr, &dev_attr_dcr.attr, &dev_attr_pid.attr, &dev_attr_dynamic_address.attr, &dev_attr_hdrcap.attr, NULL, }; ATTRIBUTE_GROUPS(i3c_masterdev); static void i3c_masterdev_release(struct device *dev) { struct i3c_master_controller *master = dev_to_i3cmaster(dev); struct i3c_bus *bus = dev_to_i3cbus(dev); if (master->wq) destroy_workqueue(master->wq); WARN_ON(!list_empty(&bus->devs.i2c) || !list_empty(&bus->devs.i3c)); i3c_bus_cleanup(bus); of_node_put(dev->of_node); } static const struct device_type i3c_masterdev_type = { .groups = i3c_masterdev_groups, }; int i3c_bus_set_mode(struct i3c_bus *i3cbus, enum i3c_bus_mode mode) { i3cbus->mode = mode; if (!i3cbus->scl_rate.i3c) i3cbus->scl_rate.i3c = I3C_BUS_TYP_I3C_SCL_RATE; if (!i3cbus->scl_rate.i2c) { if (i3cbus->mode == I3C_BUS_MODE_MIXED_SLOW) i3cbus->scl_rate.i2c = I3C_BUS_I2C_FM_SCL_RATE; else i3cbus->scl_rate.i2c = I3C_BUS_I2C_FM_PLUS_SCL_RATE; } /* * I3C/I2C frequency may have been overridden, check that user-provided * values are not exceeding max possible frequency. */ if (i3cbus->scl_rate.i3c > I3C_BUS_MAX_I3C_SCL_RATE || i3cbus->scl_rate.i2c > I3C_BUS_I2C_FM_PLUS_SCL_RATE) return -EINVAL; return 0; } static struct i3c_master_controller * i2c_adapter_to_i3c_master(struct i2c_adapter *adap) { return container_of(adap, struct i3c_master_controller, i2c); } static struct i2c_adapter * i3c_master_to_i2c_adapter(struct i3c_master_controller *master) { return &master->i2c; } static void i3c_master_free_i2c_dev(struct i2c_dev_desc *dev) { kfree(dev); } static struct i2c_dev_desc * i3c_master_alloc_i2c_dev(struct i3c_master_controller *master, const struct i2c_dev_boardinfo *boardinfo) { struct i2c_dev_desc *dev; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return ERR_PTR(-ENOMEM); dev->common.master = master; dev->boardinfo = boardinfo; return dev; } static void *i3c_ccc_cmd_dest_init(struct i3c_ccc_cmd_dest *dest, u8 addr, u16 payloadlen) { dest->addr = addr; dest->payload.len = payloadlen; if (payloadlen) dest->payload.data = kzalloc(payloadlen, GFP_KERNEL); else dest->payload.data = NULL; return dest->payload.data; } static void i3c_ccc_cmd_dest_cleanup(struct i3c_ccc_cmd_dest *dest) { kfree(dest->payload.data); } static void i3c_ccc_cmd_init(struct i3c_ccc_cmd *cmd, bool rnw, u8 id, struct i3c_ccc_cmd_dest *dests, unsigned int ndests) { cmd->rnw = rnw ? 1 : 0; cmd->id = id; cmd->dests = dests; cmd->ndests = ndests; cmd->err = I3C_ERROR_UNKNOWN; } static int i3c_master_send_ccc_cmd_locked(struct i3c_master_controller *master, struct i3c_ccc_cmd *cmd) { int ret; if (!cmd || !master) return -EINVAL; if (WARN_ON(master->init_done && !rwsem_is_locked(&master->bus.lock))) return -EINVAL; if (!master->ops->send_ccc_cmd) return -ENOTSUPP; if ((cmd->id & I3C_CCC_DIRECT) && (!cmd->dests || !cmd->ndests)) return -EINVAL; if (master->ops->supports_ccc_cmd && !master->ops->supports_ccc_cmd(master, cmd)) return -ENOTSUPP; ret = master->ops->send_ccc_cmd(master, cmd); if (ret) { if (cmd->err != I3C_ERROR_UNKNOWN) return cmd->err; return ret; } return 0; } static struct i2c_dev_desc * i3c_master_find_i2c_dev_by_addr(const struct i3c_master_controller *master, u16 addr) { struct i2c_dev_desc *dev; i3c_bus_for_each_i2cdev(&master->bus, dev) { if (dev->boardinfo->base.addr == addr) return dev; } return NULL; } /** * i3c_master_get_free_addr() - get a free address on the bus * @master: I3C master object * @start_addr: where to start searching * * This function must be called with the bus lock held in write mode. * * Return: the first free address starting at @start_addr (included) or -ENOMEM * if there's no more address available. */ int i3c_master_get_free_addr(struct i3c_master_controller *master, u8 start_addr) { return i3c_bus_get_free_addr(&master->bus, start_addr); } EXPORT_SYMBOL_GPL(i3c_master_get_free_addr); static void i3c_device_release(struct device *dev) { struct i3c_device *i3cdev = dev_to_i3cdev(dev); WARN_ON(i3cdev->desc); of_node_put(i3cdev->dev.of_node); kfree(i3cdev); } static void i3c_master_free_i3c_dev(struct i3c_dev_desc *dev) { kfree(dev); } static struct i3c_dev_desc * i3c_master_alloc_i3c_dev(struct i3c_master_controller *master, const struct i3c_device_info *info) { struct i3c_dev_desc *dev; dev = kzalloc(sizeof(*dev), GFP_KERNEL); if (!dev) return ERR_PTR(-ENOMEM); dev->common.master = master; dev->info = *info; mutex_init(&dev->ibi_lock); return dev; } static int i3c_master_rstdaa_locked(struct i3c_master_controller *master, u8 addr) { enum i3c_addr_slot_status addrstat; struct i3c_ccc_cmd_dest dest; struct i3c_ccc_cmd cmd; int ret; if (!master) return -EINVAL; addrstat = i3c_bus_get_addr_slot_status(&master->bus, addr); if (addr != I3C_BROADCAST_ADDR && addrstat != I3C_ADDR_SLOT_I3C_DEV) return -EINVAL; i3c_ccc_cmd_dest_init(&dest, addr, 0); i3c_ccc_cmd_init(&cmd, false, I3C_CCC_RSTDAA(addr == I3C_BROADCAST_ADDR), &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); i3c_ccc_cmd_dest_cleanup(&dest); return ret; } /** * i3c_master_entdaa_locked() - start a DAA (Dynamic Address Assignment) * procedure * @master: master used to send frames on the bus * * Send a ENTDAA CCC command to start a DAA procedure. * * Note that this function only sends the ENTDAA CCC command, all the logic * behind dynamic address assignment has to be handled in the I3C master * driver. * * This function must be called with the bus lock held in write mode. * * Return: 0 in case of success, a positive I3C error code if the error is * one of the official Mx error codes, and a negative error code otherwise. */ int i3c_master_entdaa_locked(struct i3c_master_controller *master) { struct i3c_ccc_cmd_dest dest; struct i3c_ccc_cmd cmd; int ret; i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR, 0); i3c_ccc_cmd_init(&cmd, false, I3C_CCC_ENTDAA, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); i3c_ccc_cmd_dest_cleanup(&dest); return ret; } EXPORT_SYMBOL_GPL(i3c_master_entdaa_locked); static int i3c_master_enec_disec_locked(struct i3c_master_controller *master, u8 addr, bool enable, u8 evts) { struct i3c_ccc_events *events; struct i3c_ccc_cmd_dest dest; struct i3c_ccc_cmd cmd; int ret; events = i3c_ccc_cmd_dest_init(&dest, addr, sizeof(*events)); if (!events) return -ENOMEM; events->events = evts; i3c_ccc_cmd_init(&cmd, false, enable ? I3C_CCC_ENEC(addr == I3C_BROADCAST_ADDR) : I3C_CCC_DISEC(addr == I3C_BROADCAST_ADDR), &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); i3c_ccc_cmd_dest_cleanup(&dest); return ret; } /** * i3c_master_disec_locked() - send a DISEC CCC command * @master: master used to send frames on the bus * @addr: a valid I3C slave address or %I3C_BROADCAST_ADDR * @evts: events to disable * * Send a DISEC CCC command to disable some or all events coming from a * specific slave, or all devices if @addr is %I3C_BROADCAST_ADDR. * * This function must be called with the bus lock held in write mode. * * Return: 0 in case of success, a positive I3C error code if the error is * one of the official Mx error codes, and a negative error code otherwise. */ int i3c_master_disec_locked(struct i3c_master_controller *master, u8 addr, u8 evts) { return i3c_master_enec_disec_locked(master, addr, false, evts); } EXPORT_SYMBOL_GPL(i3c_master_disec_locked); /** * i3c_master_enec_locked() - send an ENEC CCC command * @master: master used to send frames on the bus * @addr: a valid I3C slave address or %I3C_BROADCAST_ADDR * @evts: events to disable * * Sends an ENEC CCC command to enable some or all events coming from a * specific slave, or all devices if @addr is %I3C_BROADCAST_ADDR. * * This function must be called with the bus lock held in write mode. * * Return: 0 in case of success, a positive I3C error code if the error is * one of the official Mx error codes, and a negative error code otherwise. */ int i3c_master_enec_locked(struct i3c_master_controller *master, u8 addr, u8 evts) { return i3c_master_enec_disec_locked(master, addr, true, evts); } EXPORT_SYMBOL_GPL(i3c_master_enec_locked); /** * i3c_master_defslvs_locked() - send a DEFSLVS CCC command * @master: master used to send frames on the bus * * Send a DEFSLVS CCC command containing all the devices known to the @master. * This is useful when you have secondary masters on the bus to propagate * device information. * * This should be called after all I3C devices have been discovered (in other * words, after the DAA procedure has finished) and instantiated in * &i3c_master_controller_ops->bus_init(). * It should also be called if a master ACKed an Hot-Join request and assigned * a dynamic address to the device joining the bus. * * This function must be called with the bus lock held in write mode. * * Return: 0 in case of success, a positive I3C error code if the error is * one of the official Mx error codes, and a negative error code otherwise. */ int i3c_master_defslvs_locked(struct i3c_master_controller *master) { struct i3c_ccc_defslvs *defslvs; struct i3c_ccc_dev_desc *desc; struct i3c_ccc_cmd_dest dest; struct i3c_dev_desc *i3cdev; struct i2c_dev_desc *i2cdev; struct i3c_ccc_cmd cmd; struct i3c_bus *bus; bool send = false; int ndevs = 0, ret; if (!master) return -EINVAL; bus = i3c_master_get_bus(master); i3c_bus_for_each_i3cdev(bus, i3cdev) { ndevs++; if (i3cdev == master->this) continue; if (I3C_BCR_DEVICE_ROLE(i3cdev->info.bcr) == I3C_BCR_I3C_MASTER) send = true; } /* No other master on the bus, skip DEFSLVS. */ if (!send) return 0; i3c_bus_for_each_i2cdev(bus, i2cdev) ndevs++; defslvs = i3c_ccc_cmd_dest_init(&dest, I3C_BROADCAST_ADDR, sizeof(*defslvs) + ((ndevs - 1) * sizeof(struct i3c_ccc_dev_desc))); if (!defslvs) return -ENOMEM; defslvs->count = ndevs; defslvs->master.bcr = master->this->info.bcr; defslvs->master.dcr = master->this->info.dcr; defslvs->master.dyn_addr = master->this->info.dyn_addr << 1; defslvs->master.static_addr = I3C_BROADCAST_ADDR << 1; desc = defslvs->slaves; i3c_bus_for_each_i2cdev(bus, i2cdev) { desc->lvr = i2cdev->boardinfo->lvr; desc->static_addr = i2cdev->boardinfo->base.addr << 1; desc++; } i3c_bus_for_each_i3cdev(bus, i3cdev) { /* Skip the I3C dev representing this master. */ if (i3cdev == master->this) continue; desc->bcr = i3cdev->info.bcr; desc->dcr = i3cdev->info.dcr; desc->dyn_addr = i3cdev->info.dyn_addr << 1; desc->static_addr = i3cdev->info.static_addr << 1; desc++; } i3c_ccc_cmd_init(&cmd, false, I3C_CCC_DEFSLVS, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); i3c_ccc_cmd_dest_cleanup(&dest); return ret; } EXPORT_SYMBOL_GPL(i3c_master_defslvs_locked); static int i3c_master_setda_locked(struct i3c_master_controller *master, u8 oldaddr, u8 newaddr, bool setdasa) { struct i3c_ccc_cmd_dest dest; struct i3c_ccc_setda *setda; struct i3c_ccc_cmd cmd; int ret; if (!oldaddr || !newaddr) return -EINVAL; setda = i3c_ccc_cmd_dest_init(&dest, oldaddr, sizeof(*setda)); if (!setda) return -ENOMEM; setda->addr = newaddr << 1; i3c_ccc_cmd_init(&cmd, false, setdasa ? I3C_CCC_SETDASA : I3C_CCC_SETNEWDA, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); i3c_ccc_cmd_dest_cleanup(&dest); return ret; } static int i3c_master_setdasa_locked(struct i3c_master_controller *master, u8 static_addr, u8 dyn_addr) { return i3c_master_setda_locked(master, static_addr, dyn_addr, true); } static int i3c_master_setnewda_locked(struct i3c_master_controller *master, u8 oldaddr, u8 newaddr) { return i3c_master_setda_locked(master, oldaddr, newaddr, false); } static int i3c_master_getmrl_locked(struct i3c_master_controller *master, struct i3c_device_info *info) { struct i3c_ccc_cmd_dest dest; unsigned int expected_len; struct i3c_ccc_mrl *mrl; struct i3c_ccc_cmd cmd; int ret; mrl = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*mrl)); if (!mrl) return -ENOMEM; /* * When the device does not have IBI payload GETMRL only returns 2 * bytes of data. */ if (!(info->bcr & I3C_BCR_IBI_PAYLOAD)) dest.payload.len -= 1; expected_len = dest.payload.len; i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMRL, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); if (ret) goto out; if (dest.payload.len != expected_len) { ret = -EIO; goto out; } info->max_read_len = be16_to_cpu(mrl->read_len); if (info->bcr & I3C_BCR_IBI_PAYLOAD) info->max_ibi_len = mrl->ibi_len; out: i3c_ccc_cmd_dest_cleanup(&dest); return ret; } static int i3c_master_getmwl_locked(struct i3c_master_controller *master, struct i3c_device_info *info) { struct i3c_ccc_cmd_dest dest; struct i3c_ccc_mwl *mwl; struct i3c_ccc_cmd cmd; int ret; mwl = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*mwl)); if (!mwl) return -ENOMEM; i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMWL, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); if (ret) goto out; if (dest.payload.len != sizeof(*mwl)) return -EIO; info->max_write_len = be16_to_cpu(mwl->len); out: i3c_ccc_cmd_dest_cleanup(&dest); return ret; } static int i3c_master_getmxds_locked(struct i3c_master_controller *master, struct i3c_device_info *info) { struct i3c_ccc_getmxds *getmaxds; struct i3c_ccc_cmd_dest dest; struct i3c_ccc_cmd cmd; int ret; getmaxds = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getmaxds)); if (!getmaxds) return -ENOMEM; i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETMXDS, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); if (ret) goto out; if (dest.payload.len != 2 && dest.payload.len != 5) { ret = -EIO; goto out; } info->max_read_ds = getmaxds->maxrd; info->max_write_ds = getmaxds->maxwr; if (dest.payload.len == 5) info->max_read_turnaround = getmaxds->maxrdturn[0] | ((u32)getmaxds->maxrdturn[1] << 8) | ((u32)getmaxds->maxrdturn[2] << 16); out: i3c_ccc_cmd_dest_cleanup(&dest); return ret; } static int i3c_master_gethdrcap_locked(struct i3c_master_controller *master, struct i3c_device_info *info) { struct i3c_ccc_gethdrcap *gethdrcap; struct i3c_ccc_cmd_dest dest; struct i3c_ccc_cmd cmd; int ret; gethdrcap = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*gethdrcap)); if (!gethdrcap) return -ENOMEM; i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETHDRCAP, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); if (ret) goto out; if (dest.payload.len != 1) { ret = -EIO; goto out; } info->hdr_cap = gethdrcap->modes; out: i3c_ccc_cmd_dest_cleanup(&dest); return ret; } static int i3c_master_getpid_locked(struct i3c_master_controller *master, struct i3c_device_info *info) { struct i3c_ccc_getpid *getpid; struct i3c_ccc_cmd_dest dest; struct i3c_ccc_cmd cmd; int ret, i; getpid = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getpid)); if (!getpid) return -ENOMEM; i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETPID, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); if (ret) goto out; info->pid = 0; for (i = 0; i < sizeof(getpid->pid); i++) { int sft = (sizeof(getpid->pid) - i - 1) * 8; info->pid |= (u64)getpid->pid[i] << sft; } out: i3c_ccc_cmd_dest_cleanup(&dest); return ret; } static int i3c_master_getbcr_locked(struct i3c_master_controller *master, struct i3c_device_info *info) { struct i3c_ccc_getbcr *getbcr; struct i3c_ccc_cmd_dest dest; struct i3c_ccc_cmd cmd; int ret; getbcr = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getbcr)); if (!getbcr) return -ENOMEM; i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETBCR, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); if (ret) goto out; info->bcr = getbcr->bcr; out: i3c_ccc_cmd_dest_cleanup(&dest); return ret; } static int i3c_master_getdcr_locked(struct i3c_master_controller *master, struct i3c_device_info *info) { struct i3c_ccc_getdcr *getdcr; struct i3c_ccc_cmd_dest dest; struct i3c_ccc_cmd cmd; int ret; getdcr = i3c_ccc_cmd_dest_init(&dest, info->dyn_addr, sizeof(*getdcr)); if (!getdcr) return -ENOMEM; i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETDCR, &dest, 1); ret = i3c_master_send_ccc_cmd_locked(master, &cmd); if (ret) goto out; info->dcr = getdcr->dcr; out: i3c_ccc_cmd_dest_cleanup(&dest); return ret; } static int i3c_master_retrieve_dev_info(struct i3c_dev_desc *dev) { struct i3c_master_controller *master = i3c_dev_get_master(dev); enum i3c_addr_slot_status slot_status; int ret; if (!dev->info.dyn_addr) return -EINVAL; slot_status = i3c_bus_get_addr_slot_status(&master->bus, dev->info.dyn_addr); if (slot_status == I3C_ADDR_SLOT_RSVD || slot_status == I3C_ADDR_SLOT_I2C_DEV) return -EINVAL; ret = i3c_master_getpid_locked(master, &dev->info); if (ret) return ret; ret = i3c_master_getbcr_locked(master, &dev->info); if (ret) return ret; ret = i3c_master_getdcr_locked(master, &dev->info); if (ret) return ret; if (dev->info.bcr & I3C_BCR_MAX_DATA_SPEED_LIM) { ret = i3c_master_getmxds_locked(master, &dev->info); if (ret) return ret; } if (dev->info.bcr & I3C_BCR_IBI_PAYLOAD) dev->info.max_ibi_len = 1; i3c_master_getmrl_locked(master, &dev->info); i3c_master_getmwl_locked(master, &dev->info); if (dev->info.bcr & I3C_BCR_HDR_CAP) { ret = i3c_master_gethdrcap_locked(master, &dev->info); if (ret) return ret; } return 0; } static void i3c_master_put_i3c_addrs(struct i3c_dev_desc *dev) { struct i3c_master_controller *master = i3c_dev_get_master(dev); if (dev->info.static_addr) i3c_bus_set_addr_slot_status(&master->bus, dev->info.static_addr, I3C_ADDR_SLOT_FREE); if (dev->info.dyn_addr) i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, I3C_ADDR_SLOT_FREE); if (dev->boardinfo && dev->boardinfo->init_dyn_addr) i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, I3C_ADDR_SLOT_FREE); } static int i3c_master_get_i3c_addrs(struct i3c_dev_desc *dev) { struct i3c_master_controller *master = i3c_dev_get_master(dev); enum i3c_addr_slot_status status; if (!dev->info.static_addr && !dev->info.dyn_addr) return 0; if (dev->info.static_addr) { status = i3c_bus_get_addr_slot_status(&master->bus, dev->info.static_addr); if (status != I3C_ADDR_SLOT_FREE) return -EBUSY; i3c_bus_set_addr_slot_status(&master->bus, dev->info.static_addr, I3C_ADDR_SLOT_I3C_DEV); } /* * ->init_dyn_addr should have been reserved before that, so, if we're * trying to apply a pre-reserved dynamic address, we should not try * to reserve the address slot a second time. */ if (dev->info.dyn_addr && (!dev->boardinfo || dev->boardinfo->init_dyn_addr != dev->info.dyn_addr)) { status = i3c_bus_get_addr_slot_status(&master->bus, dev->info.dyn_addr); if (status != I3C_ADDR_SLOT_FREE) goto err_release_static_addr; i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, I3C_ADDR_SLOT_I3C_DEV); } return 0; err_release_static_addr: if (dev->info.static_addr) i3c_bus_set_addr_slot_status(&master->bus, dev->info.static_addr, I3C_ADDR_SLOT_FREE); return -EBUSY; } static int i3c_master_attach_i3c_dev(struct i3c_master_controller *master, struct i3c_dev_desc *dev) { int ret; /* * We don't attach devices to the controller until they are * addressable on the bus. */ if (!dev->info.static_addr && !dev->info.dyn_addr) return 0; ret = i3c_master_get_i3c_addrs(dev); if (ret) return ret; /* Do not attach the master device itself. */ if (master->this != dev && master->ops->attach_i3c_dev) { ret = master->ops->attach_i3c_dev(dev); if (ret) { i3c_master_put_i3c_addrs(dev); return ret; } } list_add_tail(&dev->common.node, &master->bus.devs.i3c); return 0; } static int i3c_master_reattach_i3c_dev(struct i3c_dev_desc *dev, u8 old_dyn_addr) { struct i3c_master_controller *master = i3c_dev_get_master(dev); enum i3c_addr_slot_status status; int ret; if (dev->info.dyn_addr != old_dyn_addr) { status = i3c_bus_get_addr_slot_status(&master->bus, dev->info.dyn_addr); if (status != I3C_ADDR_SLOT_FREE) return -EBUSY; i3c_bus_set_addr_slot_status(&master->bus, dev->info.dyn_addr, I3C_ADDR_SLOT_I3C_DEV); } if (master->ops->reattach_i3c_dev) { ret = master->ops->reattach_i3c_dev(dev, old_dyn_addr); if (ret) { i3c_master_put_i3c_addrs(dev); return ret; } } return 0; } static void i3c_master_detach_i3c_dev(struct i3c_dev_desc *dev) { struct i3c_master_controller *master = i3c_dev_get_master(dev); /* Do not detach the master device itself. */ if (master->this != dev && master->ops->detach_i3c_dev) master->ops->detach_i3c_dev(dev); i3c_master_put_i3c_addrs(dev); list_del(&dev->common.node); } static int i3c_master_attach_i2c_dev(struct i3c_master_controller *master, struct i2c_dev_desc *dev) { int ret; if (master->ops->attach_i2c_dev) { ret = master->ops->attach_i2c_dev(dev); if (ret) return ret; } list_add_tail(&dev->common.node, &master->bus.devs.i2c); return 0; } static void i3c_master_detach_i2c_dev(struct i2c_dev_desc *dev) { struct i3c_master_controller *master = i2c_dev_get_master(dev); list_del(&dev->common.node); if (master->ops->detach_i2c_dev) master->ops->detach_i2c_dev(dev); } static void i3c_master_pre_assign_dyn_addr(struct i3c_dev_desc *dev) { struct i3c_master_controller *master = i3c_dev_get_master(dev); int ret; if (!dev->boardinfo || !dev->boardinfo->init_dyn_addr || !dev->boardinfo->static_addr) return; ret = i3c_master_setdasa_locked(master, dev->info.static_addr, dev->boardinfo->init_dyn_addr); if (ret) return; dev->info.dyn_addr = dev->boardinfo->init_dyn_addr; ret = i3c_master_reattach_i3c_dev(dev, 0); if (ret) goto err_rstdaa; ret = i3c_master_retrieve_dev_info(dev); if (ret) goto err_rstdaa; return; err_rstdaa: i3c_master_rstdaa_locked(master, dev->boardinfo->init_dyn_addr); } static void i3c_master_register_new_i3c_devs(struct i3c_master_controller *master) { struct i3c_dev_desc *desc; int ret; if (!master->init_done) return; i3c_bus_for_each_i3cdev(&master->bus, desc) { if (desc->dev || !desc->info.dyn_addr || desc == master->this) continue; desc->dev = kzalloc(sizeof(*desc->dev), GFP_KERNEL); if (!desc->dev) continue; desc->dev->bus = &master->bus; desc->dev->desc = desc; desc->dev->dev.parent = &master->dev; desc->dev->dev.type = &i3c_device_type; desc->dev->dev.bus = &i3c_bus_type; desc->dev->dev.release = i3c_device_release; dev_set_name(&desc->dev->dev, "%d-%llx", master->bus.id, desc->info.pid); if (desc->boardinfo) desc->dev->dev.of_node = desc->boardinfo->of_node; ret = device_register(&desc->dev->dev); if (ret) dev_err(&master->dev, "Failed to add I3C device (err = %d)\n", ret); } } /** * i3c_master_do_daa() - do a DAA (Dynamic Address Assignment) * @master: master doing the DAA * * This function is instantiating an I3C device object and adding it to the * I3C device list. All device information are automatically retrieved using * standard CCC commands. * * The I3C device object is returned in case the master wants to attach * private data to it using i3c_dev_set_master_data(). * * This function must be called with the bus lock held in write mode. * * Return: a 0 in case of success, an negative error code otherwise. */ int i3c_master_do_daa(struct i3c_master_controller *master) { int ret; i3c_bus_maintenance_lock(&master->bus); ret = master->ops->do_daa(master); i3c_bus_maintenance_unlock(&master->bus); if (ret) return ret; i3c_bus_normaluse_lock(&master->bus); i3c_master_register_new_i3c_devs(master); i3c_bus_normaluse_unlock(&master->bus); return 0; } EXPORT_SYMBOL_GPL(i3c_master_do_daa); /** * i3c_master_set_info() - set master device information * @master: master used to send frames on the bus * @info: I3C device information * * Set master device info. This should be called from * &i3c_master_controller_ops->bus_init(). * * Not all &i3c_device_info fields are meaningful for a master device. * Here is a list of fields that should be properly filled: * * - &i3c_device_info->dyn_addr * - &i3c_device_info->bcr * - &i3c_device_info->dcr * - &i3c_device_info->pid * - &i3c_device_info->hdr_cap if %I3C_BCR_HDR_CAP bit is set in * &i3c_device_info->bcr * * This function must be called with the bus lock held in maintenance mode. * * Return: 0 if @info contains valid information (not every piece of * information can be checked, but we can at least make sure @info->dyn_addr * and @info->bcr are correct), -EINVAL otherwise. */ int i3c_master_set_info(struct i3c_master_controller *master, const struct i3c_device_info *info) { struct i3c_dev_desc *i3cdev; int ret; if (!i3c_bus_dev_addr_is_avail(&master->bus, info->dyn_addr)) return -EINVAL; if (I3C_BCR_DEVICE_ROLE(info->bcr) == I3C_BCR_I3C_MASTER && master->secondary) return -EINVAL; if (master->this) return -EINVAL; i3cdev = i3c_master_alloc_i3c_dev(master, info); if (IS_ERR(i3cdev)) return PTR_ERR(i3cdev); master->this = i3cdev; master->bus.cur_master = master->this; ret = i3c_master_attach_i3c_dev(master, i3cdev); if (ret) goto err_free_dev; return 0; err_free_dev: i3c_master_free_i3c_dev(i3cdev); return ret; } EXPORT_SYMBOL_GPL(i3c_master_set_info); static void i3c_master_detach_free_devs(struct i3c_master_controller *master) { struct i3c_dev_desc *i3cdev, *i3ctmp; struct i2c_dev_desc *i2cdev, *i2ctmp; list_for_each_entry_safe(i3cdev, i3ctmp, &master->bus.devs.i3c, common.node) { i3c_master_detach_i3c_dev(i3cdev); if (i3cdev->boardinfo && i3cdev->boardinfo->init_dyn_addr) i3c_bus_set_addr_slot_status(&master->bus, i3cdev->boardinfo->init_dyn_addr, I3C_ADDR_SLOT_FREE); i3c_master_free_i3c_dev(i3cdev); } list_for_each_entry_safe(i2cdev, i2ctmp, &master->bus.devs.i2c, common.node) { i3c_master_detach_i2c_dev(i2cdev); i3c_bus_set_addr_slot_status(&master->bus, i2cdev->boardinfo->base.addr, I3C_ADDR_SLOT_FREE); i3c_master_free_i2c_dev(i2cdev); } } /** * i3c_master_bus_init() - initialize an I3C bus * @master: main master initializing the bus * * This function is following all initialisation steps described in the I3C * specification: * * 1. Attach I2C and statically defined I3C devs to the master so that the * master can fill its internal device table appropriately * * 2. Call &i3c_master_controller_ops->bus_init() method to initialize * the master controller. That's usually where the bus mode is selected * (pure bus or mixed fast/slow bus) * * 3. Instruct all devices on the bus to drop their dynamic address. This is * particularly important when the bus was previously configured by someone * else (for example the bootloader) * * 4. Disable all slave events. * * 5. Pre-assign dynamic addresses requested by the FW with SETDASA for I3C * devices that have a static address * * 6. Do a DAA (Dynamic Address Assignment) to assign dynamic addresses to all * remaining I3C devices * * Once this is done, all I3C and I2C devices should be usable. * * Return: a 0 in case of success, an negative error code otherwise. */ static int i3c_master_bus_init(struct i3c_master_controller *master) { enum i3c_addr_slot_status status; struct i2c_dev_boardinfo *i2cboardinfo; struct i3c_dev_boardinfo *i3cboardinfo; struct i3c_dev_desc *i3cdev; struct i2c_dev_desc *i2cdev; int ret; /* * First attach all devices with static definitions provided by the * FW. */ list_for_each_entry(i2cboardinfo, &master->boardinfo.i2c, node) { status = i3c_bus_get_addr_slot_status(&master->bus, i2cboardinfo->base.addr); if (status != I3C_ADDR_SLOT_FREE) { ret = -EBUSY; goto err_detach_devs; } i3c_bus_set_addr_slot_status(&master->bus, i2cboardinfo->base.addr, I3C_ADDR_SLOT_I2C_DEV); i2cdev = i3c_master_alloc_i2c_dev(master, i2cboardinfo); if (IS_ERR(i2cdev)) { ret = PTR_ERR(i2cdev); goto err_detach_devs; } ret = i3c_master_attach_i2c_dev(master, i2cdev); if (ret) { i3c_master_free_i2c_dev(i2cdev); goto err_detach_devs; } } list_for_each_entry(i3cboardinfo, &master->boardinfo.i3c, node) { struct i3c_device_info info = { .static_addr = i3cboardinfo->static_addr, }; if (i3cboardinfo->init_dyn_addr) { status = i3c_bus_get_addr_slot_status(&master->bus, i3cboardinfo->init_dyn_addr); if (status != I3C_ADDR_SLOT_FREE) { ret = -EBUSY; goto err_detach_devs; } } i3cdev = i3c_master_alloc_i3c_dev(master, &info); if (IS_ERR(i3cdev)) { ret = PTR_ERR(i3cdev); goto err_detach_devs; } i3cdev->boardinfo = i3cboardinfo; ret = i3c_master_attach_i3c_dev(master, i3cdev); if (ret) { i3c_master_free_i3c_dev(i3cdev); goto err_detach_devs; } } /* * Now execute the controller specific ->bus_init() routine, which * might configure its internal logic to match the bus limitations. */ ret = master->ops->bus_init(master); if (ret) goto err_detach_devs; /* * The master device should have been instantiated in ->bus_init(), * complain if this was not the case. */ if (!master->this) { dev_err(&master->dev, "master_set_info() was not called in ->bus_init()\n"); ret = -EINVAL; goto err_bus_cleanup; } /* * Reset all dynamic address that may have been assigned before * (assigned by the bootloader for example). */ ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR); if (ret && ret != I3C_ERROR_M2) goto err_bus_cleanup; /* Disable all slave events before starting DAA. */ ret = i3c_master_disec_locked(master, I3C_BROADCAST_ADDR, I3C_CCC_EVENT_SIR | I3C_CCC_EVENT_MR | I3C_CCC_EVENT_HJ); if (ret && ret != I3C_ERROR_M2) goto err_bus_cleanup; /* * Pre-assign dynamic address and retrieve device information if * needed. */ i3c_bus_for_each_i3cdev(&master->bus, i3cdev) i3c_master_pre_assign_dyn_addr(i3cdev); ret = i3c_master_do_daa(master); if (ret) goto err_rstdaa; return 0; err_rstdaa: i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR); err_bus_cleanup: if (master->ops->bus_cleanup) master->ops->bus_cleanup(master); err_detach_devs: i3c_master_detach_free_devs(master); return ret; } static void i3c_master_bus_cleanup(struct i3c_master_controller *master) { if (master->ops->bus_cleanup) master->ops->bus_cleanup(master); i3c_master_detach_free_devs(master); } static struct i3c_dev_desc * i3c_master_search_i3c_dev_duplicate(struct i3c_dev_desc *refdev) { struct i3c_master_controller *master = refdev->common.master; struct i3c_dev_desc *i3cdev; i3c_bus_for_each_i3cdev(&master->bus, i3cdev) { if (i3cdev != refdev && i3cdev->info.pid == refdev->info.pid) return i3cdev; } return NULL; } /** * i3c_master_add_i3c_dev_locked() - add an I3C slave to the bus * @master: master used to send frames on the bus * @addr: I3C slave dynamic address assigned to the device * * This function is instantiating an I3C device object and adding it to the * I3C device list. All device information are automatically retrieved using * standard CCC commands. * * The I3C device object is returned in case the master wants to attach * private data to it using i3c_dev_set_master_data(). * * This function must be called with the bus lock held in write mode. * * Return: a 0 in case of success, an negative error code otherwise. */ int i3c_master_add_i3c_dev_locked(struct i3c_master_controller *master, u8 addr) { struct i3c_device_info info = { .dyn_addr = addr }; struct i3c_dev_desc *newdev, *olddev; u8 old_dyn_addr = addr, expected_dyn_addr; struct i3c_ibi_setup ibireq = { }; bool enable_ibi = false; int ret; if (!master) return -EINVAL; newdev = i3c_master_alloc_i3c_dev(master, &info); if (IS_ERR(newdev)) return PTR_ERR(newdev); ret = i3c_master_attach_i3c_dev(master, newdev); if (ret) goto err_free_dev; ret = i3c_master_retrieve_dev_info(newdev); if (ret) goto err_detach_dev; olddev = i3c_master_search_i3c_dev_duplicate(newdev); if (olddev) { newdev->boardinfo = olddev->boardinfo; newdev->info.static_addr = olddev->info.static_addr; newdev->dev = olddev->dev; if (newdev->dev) newdev->dev->desc = newdev; /* * We need to restore the IBI state too, so let's save the * IBI information and try to restore them after olddev has * been detached+released and its IBI has been stopped and * the associated resources have been freed. */ mutex_lock(&olddev->ibi_lock); if (olddev->ibi) { ibireq.handler = olddev->ibi->handler; ibireq.max_payload_len = olddev->ibi->max_payload_len; ibireq.num_slots = olddev->ibi->num_slots; if (olddev->ibi->enabled) { enable_ibi = true; i3c_dev_disable_ibi_locked(olddev); } i3c_dev_free_ibi_locked(olddev); } mutex_unlock(&olddev->ibi_lock); old_dyn_addr = olddev->info.dyn_addr; i3c_master_detach_i3c_dev(olddev); i3c_master_free_i3c_dev(olddev); } ret = i3c_master_reattach_i3c_dev(newdev, old_dyn_addr); if (ret) goto err_detach_dev; /* * Depending on our previous state, the expected dynamic address might * differ: * - if the device already had a dynamic address assigned, let's try to * re-apply this one * - if the device did not have a dynamic address and the firmware * requested a specific address, pick this one * - in any other case, keep the address automatically assigned by the * master */ if (old_dyn_addr && old_dyn_addr != newdev->info.dyn_addr) expected_dyn_addr = old_dyn_addr; else if (newdev->boardinfo && newdev->boardinfo->init_dyn_addr) expected_dyn_addr = newdev->boardinfo->init_dyn_addr; else expected_dyn_addr = newdev->info.dyn_addr; if (newdev->info.dyn_addr != expected_dyn_addr) { /* * Try to apply the expected dynamic address. If it fails, keep * the address assigned by the master. */ ret = i3c_master_setnewda_locked(master, newdev->info.dyn_addr, expected_dyn_addr); if (!ret) { old_dyn_addr = newdev->info.dyn_addr; newdev->info.dyn_addr = expected_dyn_addr; i3c_master_reattach_i3c_dev(newdev, old_dyn_addr); } else { dev_err(&master->dev, "Failed to assign reserved/old address to device %d%llx", master->bus.id, newdev->info.pid); } } /* * Now is time to try to restore the IBI setup. If we're lucky, * everything works as before, otherwise, all we can do is complain. * FIXME: maybe we should add callback to inform the driver that it * should request the IBI again instead of trying to hide that from * him. */ if (ibireq.handler) { mutex_lock(&newdev->ibi_lock); ret = i3c_dev_request_ibi_locked(newdev, &ibireq); if (ret) { dev_err(&master->dev, "Failed to request IBI on device %d-%llx", master->bus.id, newdev->info.pid); } else if (enable_ibi) { ret = i3c_dev_enable_ibi_locked(newdev); if (ret) dev_err(&master->dev, "Failed to re-enable IBI on device %d-%llx", master->bus.id, newdev->info.pid); } mutex_unlock(&newdev->ibi_lock); } return 0; err_detach_dev: if (newdev->dev && newdev->dev->desc) newdev->dev->desc = NULL; i3c_master_detach_i3c_dev(newdev); err_free_dev: i3c_master_free_i3c_dev(newdev); return ret; } EXPORT_SYMBOL_GPL(i3c_master_add_i3c_dev_locked); #define OF_I3C_REG1_IS_I2C_DEV BIT(31) static int of_i3c_master_add_i2c_boardinfo(struct i3c_master_controller *master, struct device_node *node, u32 *reg) { struct i2c_dev_boardinfo *boardinfo; struct device *dev = &master->dev; int ret; boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL); if (!boardinfo) return -ENOMEM; ret = of_i2c_get_board_info(dev, node, &boardinfo->base); if (ret) return ret; /* LVR is encoded in reg[2]. */ boardinfo->lvr = reg[2]; if (boardinfo->lvr & I3C_LVR_I2C_FM_MODE) master->bus.scl_rate.i2c = I3C_BUS_I2C_FM_SCL_RATE; list_add_tail(&boardinfo->node, &master->boardinfo.i2c); of_node_get(node); return 0; } static int of_i3c_master_add_i3c_boardinfo(struct i3c_master_controller *master, struct device_node *node, u32 *reg) { struct i3c_dev_boardinfo *boardinfo; struct device *dev = &master->dev; struct i3c_device_info info = { }; enum i3c_addr_slot_status addrstatus; u32 init_dyn_addr = 0; boardinfo = devm_kzalloc(dev, sizeof(*boardinfo), GFP_KERNEL); if (!boardinfo) return -ENOMEM; if (reg[0]) { if (reg[0] > I3C_MAX_ADDR) return -EINVAL; addrstatus = i3c_bus_get_addr_slot_status(&master->bus, reg[0]); if (addrstatus != I3C_ADDR_SLOT_FREE) return -EINVAL; } boardinfo->static_addr = reg[0]; if (!of_property_read_u32(node, "assigned-address", &init_dyn_addr)) { if (init_dyn_addr > I3C_MAX_ADDR) return -EINVAL; addrstatus = i3c_bus_get_addr_slot_status(&master->bus, init_dyn_addr); if (addrstatus != I3C_ADDR_SLOT_FREE) return -EINVAL; } boardinfo->pid = ((u64)reg[1] << 32) | reg[2]; if ((info.pid & GENMASK_ULL(63, 48)) || I3C_PID_RND_LOWER_32BITS(info.pid)) return -EINVAL; boardinfo->init_dyn_addr = init_dyn_addr; boardinfo->of_node = of_node_get(node); list_add_tail(&boardinfo->node, &master->boardinfo.i3c); return 0; } static int of_i3c_master_add_dev(struct i3c_master_controller *master, struct device_node *node) { u32 reg[3]; int ret; if (!master || !node) return -EINVAL; ret = of_property_read_u32_array(node, "reg", reg, ARRAY_SIZE(reg)); if (ret) return ret; /* * The manufacturer ID can't be 0. If reg[1] == 0 that means we're * dealing with an I2C device. */ if (!reg[1]) ret = of_i3c_master_add_i2c_boardinfo(master, node, reg); else ret = of_i3c_master_add_i3c_boardinfo(master, node, reg); return ret; } static int of_populate_i3c_bus(struct i3c_master_controller *master) { struct device *dev = &master->dev; struct device_node *i3cbus_np = dev->of_node; struct device_node *node; int ret; u32 val; if (!i3cbus_np) return 0; for_each_available_child_of_node(i3cbus_np, node) { ret = of_i3c_master_add_dev(master, node); if (ret) return ret; } /* * The user might want to limit I2C and I3C speed in case some devices * on the bus are not supporting typical rates, or if the bus topology * prevents it from using max possible rate. */ if (!of_property_read_u32(i3cbus_np, "i2c-scl-hz", &val)) master->bus.scl_rate.i2c = val; if (!of_property_read_u32(i3cbus_np, "i3c-scl-hz", &val)) master->bus.scl_rate.i3c = val; return 0; } static int i3c_master_i2c_adapter_xfer(struct i2c_adapter *adap, struct i2c_msg *xfers, int nxfers) { struct i3c_master_controller *master = i2c_adapter_to_i3c_master(adap); struct i2c_dev_desc *dev; int i, ret; u16 addr; if (!xfers || !master || nxfers <= 0) return -EINVAL; if (!master->ops->i2c_xfers) return -ENOTSUPP; /* Doing transfers to different devices is not supported. */ addr = xfers[0].addr; for (i = 1; i < nxfers; i++) { if (addr != xfers[i].addr) return -ENOTSUPP; } i3c_bus_normaluse_lock(&master->bus); dev = i3c_master_find_i2c_dev_by_addr(master, addr); if (!dev) ret = -ENOENT; else ret = master->ops->i2c_xfers(dev, xfers, nxfers); i3c_bus_normaluse_unlock(&master->bus); return ret ? ret : nxfers; } static u32 i3c_master_i2c_functionalities(struct i2c_adapter *adap) { struct i3c_master_controller *master = i2c_adapter_to_i3c_master(adap); return master->ops->i2c_funcs(master); } static const struct i2c_algorithm i3c_master_i2c_algo = { .master_xfer = i3c_master_i2c_adapter_xfer, .functionality = i3c_master_i2c_functionalities, }; static int i3c_master_i2c_adapter_init(struct i3c_master_controller *master) { struct i2c_adapter *adap = i3c_master_to_i2c_adapter(master); struct i2c_dev_desc *i2cdev; int ret; adap->dev.parent = master->dev.parent; adap->owner = master->dev.parent->driver->owner; adap->algo = &i3c_master_i2c_algo; strncpy(adap->name, dev_name(master->dev.parent), sizeof(adap->name)); /* FIXME: Should we allow i3c masters to override these values? */ adap->timeout = 1000; adap->retries = 3; ret = i2c_add_adapter(adap); if (ret) return ret; /* * We silently ignore failures here. The bus should keep working * correctly even if one or more i2c devices are not registered. */ i3c_bus_for_each_i2cdev(&master->bus, i2cdev) i2cdev->dev = i2c_new_device(adap, &i2cdev->boardinfo->base); return 0; } static void i3c_master_i2c_adapter_cleanup(struct i3c_master_controller *master) { struct i2c_dev_desc *i2cdev; i2c_del_adapter(&master->i2c); i3c_bus_for_each_i2cdev(&master->bus, i2cdev) i2cdev->dev = NULL; } static void i3c_master_unregister_i3c_devs(struct i3c_master_controller *master) { struct i3c_dev_desc *i3cdev; i3c_bus_for_each_i3cdev(&master->bus, i3cdev) { if (!i3cdev->dev) continue; i3cdev->dev->desc = NULL; if (device_is_registered(&i3cdev->dev->dev)) device_unregister(&i3cdev->dev->dev); else put_device(&i3cdev->dev->dev); i3cdev->dev = NULL; } } /** * i3c_master_queue_ibi() - Queue an IBI * @dev: the device this IBI is coming from * @slot: the IBI slot used to store the payload * * Queue an IBI to the controller workqueue. The IBI handler attached to * the dev will be called from a workqueue context. */ void i3c_master_queue_ibi(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot) { atomic_inc(&dev->ibi->pending_ibis); queue_work(dev->common.master->wq, &slot->work); } EXPORT_SYMBOL_GPL(i3c_master_queue_ibi); static void i3c_master_handle_ibi(struct work_struct *work) { struct i3c_ibi_slot *slot = container_of(work, struct i3c_ibi_slot, work); struct i3c_dev_desc *dev = slot->dev; struct i3c_master_controller *master = i3c_dev_get_master(dev); struct i3c_ibi_payload payload; payload.data = slot->data; payload.len = slot->len; if (dev->dev) dev->ibi->handler(dev->dev, &payload); master->ops->recycle_ibi_slot(dev, slot); if (atomic_dec_and_test(&dev->ibi->pending_ibis)) complete(&dev->ibi->all_ibis_handled); } static void i3c_master_init_ibi_slot(struct i3c_dev_desc *dev, struct i3c_ibi_slot *slot) { slot->dev = dev; INIT_WORK(&slot->work, i3c_master_handle_ibi); } struct i3c_generic_ibi_slot { struct list_head node; struct i3c_ibi_slot base; }; struct i3c_generic_ibi_pool { spinlock_t lock; unsigned int num_slots; struct i3c_generic_ibi_slot *slots; void *payload_buf; struct list_head free_slots; struct list_head pending; }; /** * i3c_generic_ibi_free_pool() - Free a generic IBI pool * @pool: the IBI pool to free * * Free all IBI slots allated by a generic IBI pool. */ void i3c_generic_ibi_free_pool(struct i3c_generic_ibi_pool *pool) { struct i3c_generic_ibi_slot *slot; unsigned int nslots = 0; while (!list_empty(&pool->free_slots)) { slot = list_first_entry(&pool->free_slots, struct i3c_generic_ibi_slot, node); list_del(&slot->node); nslots++; } /* * If the number of freed slots is not equal to the number of allocated * slots we have a leak somewhere. */ WARN_ON(nslots != pool->num_slots); kfree(pool->payload_buf); kfree(pool->slots); kfree(pool); } EXPORT_SYMBOL_GPL(i3c_generic_ibi_free_pool); /** * i3c_generic_ibi_alloc_pool() - Create a generic IBI pool * @dev: the device this pool will be used for * @req: IBI setup request describing what the device driver expects * * Create a generic IBI pool based on the information provided in @req. * * Return: a valid IBI pool in case of success, an ERR_PTR() otherwise. */ struct i3c_generic_ibi_pool * i3c_generic_ibi_alloc_pool(struct i3c_dev_desc *dev, const struct i3c_ibi_setup *req) { struct i3c_generic_ibi_pool *pool; struct i3c_generic_ibi_slot *slot; unsigned int i; int ret; pool = kzalloc(sizeof(*pool), GFP_KERNEL); if (!pool) return ERR_PTR(-ENOMEM); spin_lock_init(&pool->lock); INIT_LIST_HEAD(&pool->free_slots); INIT_LIST_HEAD(&pool->pending); pool->slots = kcalloc(req->num_slots, sizeof(*slot), GFP_KERNEL); if (!pool->slots) { ret = -ENOMEM; goto err_free_pool; } if (req->max_payload_len) { pool->payload_buf = kcalloc(req->num_slots, req->max_payload_len, GFP_KERNEL); if (!pool->payload_buf) { ret = -ENOMEM; goto err_free_pool; } } for (i = 0; i < req->num_slots; i++) { slot = &pool->slots[i]; i3c_master_init_ibi_slot(dev, &slot->base); if (req->max_payload_len) slot->base.data = pool->payload_buf + (i * req->max_payload_len); list_add_tail(&slot->node, &pool->free_slots); pool->num_slots++; } return pool; err_free_pool: i3c_generic_ibi_free_pool(pool); return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(i3c_generic_ibi_alloc_pool); /** * i3c_generic_ibi_get_free_slot() - Get a free slot from a generic IBI pool * @pool: the pool to query an IBI slot on * * Search for a free slot in a generic IBI pool. * The slot should be returned to the pool using i3c_generic_ibi_recycle_slot() * when it's no longer needed. * * Return: a pointer to a free slot, or NULL if there's no free slot available. */ struct i3c_ibi_slot * i3c_generic_ibi_get_free_slot(struct i3c_generic_ibi_pool *pool) { struct i3c_generic_ibi_slot *slot; unsigned long flags; spin_lock_irqsave(&pool->lock, flags); slot = list_first_entry_or_null(&pool->free_slots, struct i3c_generic_ibi_slot, node); if (slot) list_del(&slot->node); spin_unlock_irqrestore(&pool->lock, flags); return slot ? &slot->base : NULL; } EXPORT_SYMBOL_GPL(i3c_generic_ibi_get_free_slot); /** * i3c_generic_ibi_recycle_slot() - Return a slot to a generic IBI pool * @pool: the pool to return the IBI slot to * @s: IBI slot to recycle * * Add an IBI slot back to its generic IBI pool. Should be called from the * master driver struct_master_controller_ops->recycle_ibi() method. */ void i3c_generic_ibi_recycle_slot(struct i3c_generic_ibi_pool *pool, struct i3c_ibi_slot *s) { struct i3c_generic_ibi_slot *slot; unsigned long flags; if (!s) return; slot = container_of(s, struct i3c_generic_ibi_slot, base); spin_lock_irqsave(&pool->lock, flags); list_add_tail(&slot->node, &pool->free_slots); spin_unlock_irqrestore(&pool->lock, flags); } EXPORT_SYMBOL_GPL(i3c_generic_ibi_recycle_slot); static int i3c_master_check_ops(const struct i3c_master_controller_ops *ops) { if (!ops || !ops->bus_init || !ops->priv_xfers || !ops->send_ccc_cmd || !ops->do_daa || !ops->i2c_xfers || !ops->i2c_funcs) return -EINVAL; if (ops->request_ibi && (!ops->enable_ibi || !ops->disable_ibi || !ops->free_ibi || !ops->recycle_ibi_slot)) return -EINVAL; return 0; } /** * i3c_master_register() - register an I3C master * @master: master used to send frames on the bus * @parent: the parent device (the one that provides this I3C master * controller) * @ops: the master controller operations * @secondary: true if you are registering a secondary master. Will return * -ENOTSUPP if set to true since secondary masters are not yet * supported * * This function takes care of everything for you: * * - creates and initializes the I3C bus * - populates the bus with static I2C devs if @parent->of_node is not * NULL * - registers all I3C devices added by the controller during bus * initialization * - registers the I2C adapter and all I2C devices * * Return: 0 in case of success, a negative error code otherwise. */ int i3c_master_register(struct i3c_master_controller *master, struct device *parent, const struct i3c_master_controller_ops *ops, bool secondary) { struct i3c_bus *i3cbus = i3c_master_get_bus(master); enum i3c_bus_mode mode = I3C_BUS_MODE_PURE; struct i2c_dev_boardinfo *i2cbi; int ret; /* We do not support secondary masters yet. */ if (secondary) return -ENOTSUPP; ret = i3c_master_check_ops(ops); if (ret) return ret; master->dev.parent = parent; master->dev.of_node = of_node_get(parent->of_node); master->dev.bus = &i3c_bus_type; master->dev.type = &i3c_masterdev_type; master->dev.release = i3c_masterdev_release; master->ops = ops; master->secondary = secondary; INIT_LIST_HEAD(&master->boardinfo.i2c); INIT_LIST_HEAD(&master->boardinfo.i3c); ret = i3c_bus_init(i3cbus); if (ret) return ret; device_initialize(&master->dev); dev_set_name(&master->dev, "i3c-%d", i3cbus->id); ret = of_populate_i3c_bus(master); if (ret) goto err_put_dev; list_for_each_entry(i2cbi, &master->boardinfo.i2c, node) { switch (i2cbi->lvr & I3C_LVR_I2C_INDEX_MASK) { case I3C_LVR_I2C_INDEX(0): if (mode < I3C_BUS_MODE_MIXED_FAST) mode = I3C_BUS_MODE_MIXED_FAST; break; case I3C_LVR_I2C_INDEX(1): case I3C_LVR_I2C_INDEX(2): if (mode < I3C_BUS_MODE_MIXED_SLOW) mode = I3C_BUS_MODE_MIXED_SLOW; break; default: ret = -EINVAL; goto err_put_dev; } } ret = i3c_bus_set_mode(i3cbus, mode); if (ret) goto err_put_dev; master->wq = alloc_workqueue("%s", 0, 0, dev_name(parent)); if (!master->wq) { ret = -ENOMEM; goto err_put_dev; } ret = i3c_master_bus_init(master); if (ret) goto err_put_dev; ret = device_add(&master->dev); if (ret) goto err_cleanup_bus; /* * Expose our I3C bus as an I2C adapter so that I2C devices are exposed * through the I2C subsystem. */ ret = i3c_master_i2c_adapter_init(master); if (ret) goto err_del_dev; /* * We're done initializing the bus and the controller, we can now * register I3C devices dicovered during the initial DAA. */ master->init_done = true; i3c_bus_normaluse_lock(&master->bus); i3c_master_register_new_i3c_devs(master); i3c_bus_normaluse_unlock(&master->bus); return 0; err_del_dev: device_del(&master->dev); err_cleanup_bus: i3c_master_bus_cleanup(master); err_put_dev: put_device(&master->dev); return ret; } EXPORT_SYMBOL_GPL(i3c_master_register); /** * i3c_master_unregister() - unregister an I3C master * @master: master used to send frames on the bus * * Basically undo everything done in i3c_master_register(). * * Return: 0 in case of success, a negative error code otherwise. */ int i3c_master_unregister(struct i3c_master_controller *master) { i3c_master_i2c_adapter_cleanup(master); i3c_master_unregister_i3c_devs(master); i3c_master_bus_cleanup(master); device_unregister(&master->dev); return 0; } EXPORT_SYMBOL_GPL(i3c_master_unregister); int i3c_dev_do_priv_xfers_locked(struct i3c_dev_desc *dev, struct i3c_priv_xfer *xfers, int nxfers) { struct i3c_master_controller *master; if (!dev) return -ENOENT; master = i3c_dev_get_master(dev); if (!master || !xfers) return -EINVAL; if (!master->ops->priv_xfers) return -ENOTSUPP; return master->ops->priv_xfers(dev, xfers, nxfers); } int i3c_dev_disable_ibi_locked(struct i3c_dev_desc *dev) { struct i3c_master_controller *master; int ret; if (!dev->ibi) return -EINVAL; master = i3c_dev_get_master(dev); ret = master->ops->disable_ibi(dev); if (ret) return ret; reinit_completion(&dev->ibi->all_ibis_handled); if (atomic_read(&dev->ibi->pending_ibis)) wait_for_completion(&dev->ibi->all_ibis_handled); dev->ibi->enabled = false; return 0; } int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev) { struct i3c_master_controller *master = i3c_dev_get_master(dev); int ret; if (!dev->ibi) return -EINVAL; ret = master->ops->enable_ibi(dev); if (!ret) dev->ibi->enabled = true; return ret; } int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev, const struct i3c_ibi_setup *req) { struct i3c_master_controller *master = i3c_dev_get_master(dev); struct i3c_device_ibi_info *ibi; int ret; if (!master->ops->request_ibi) return -ENOTSUPP; if (dev->ibi) return -EBUSY; ibi = kzalloc(sizeof(*ibi), GFP_KERNEL); if (!ibi) return -ENOMEM; atomic_set(&ibi->pending_ibis, 0); init_completion(&ibi->all_ibis_handled); ibi->handler = req->handler; ibi->max_payload_len = req->max_payload_len; ibi->num_slots = req->num_slots; dev->ibi = ibi; ret = master->ops->request_ibi(dev, req); if (ret) { kfree(ibi); dev->ibi = NULL; } return ret; } void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev) { struct i3c_master_controller *master = i3c_dev_get_master(dev); if (!dev->ibi) return; if (WARN_ON(dev->ibi->enabled)) WARN_ON(i3c_dev_disable_ibi_locked(dev)); master->ops->free_ibi(dev); kfree(dev->ibi); dev->ibi = NULL; } static int __init i3c_init(void) { return bus_register(&i3c_bus_type); } subsys_initcall(i3c_init); static void __exit i3c_exit(void) { idr_destroy(&i3c_bus_idr); bus_unregister(&i3c_bus_type); } module_exit(i3c_exit); MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>"); MODULE_DESCRIPTION("I3C core"); MODULE_LICENSE("GPL v2");
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