diff options
Diffstat (limited to 'drivers/hsi/hsi.c')
| -rw-r--r-- | drivers/hsi/hsi.c | 507 |
1 files changed, 0 insertions, 507 deletions
diff --git a/drivers/hsi/hsi.c b/drivers/hsi/hsi.c deleted file mode 100644 index 66d44581e1b1..000000000000 --- a/drivers/hsi/hsi.c +++ /dev/null @@ -1,507 +0,0 @@ -/* - * HSI core. - * - * Copyright (C) 2010 Nokia Corporation. All rights reserved. - * - * Contact: Carlos Chinea <carlos.chinea@nokia.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA - * 02110-1301 USA - */ -#include <linux/hsi/hsi.h> -#include <linux/compiler.h> -#include <linux/list.h> -#include <linux/kobject.h> -#include <linux/slab.h> -#include <linux/string.h> -#include <linux/notifier.h> -#include "hsi_core.h" - -static ssize_t modalias_show(struct device *dev, - struct device_attribute *a __maybe_unused, char *buf) -{ - return sprintf(buf, "hsi:%s\n", dev_name(dev)); -} - -static struct device_attribute hsi_bus_dev_attrs[] = { - __ATTR_RO(modalias), - __ATTR_NULL, -}; - -static int hsi_bus_uevent(struct device *dev, struct kobj_uevent_env *env) -{ - add_uevent_var(env, "MODALIAS=hsi:%s", dev_name(dev)); - - return 0; -} - -static int hsi_bus_match(struct device *dev, struct device_driver *driver) -{ - return strcmp(dev_name(dev), driver->name) == 0; -} - -static struct bus_type hsi_bus_type = { - .name = "hsi", - .dev_attrs = hsi_bus_dev_attrs, - .match = hsi_bus_match, - .uevent = hsi_bus_uevent, -}; - -static void hsi_client_release(struct device *dev) -{ - kfree(to_hsi_client(dev)); -} - -static void hsi_new_client(struct hsi_port *port, struct hsi_board_info *info) -{ - struct hsi_client *cl; - - cl = kzalloc(sizeof(*cl), GFP_KERNEL); - if (!cl) - return; - cl->tx_cfg = info->tx_cfg; - cl->rx_cfg = info->rx_cfg; - cl->device.bus = &hsi_bus_type; - cl->device.parent = &port->device; - cl->device.release = hsi_client_release; - dev_set_name(&cl->device, "%s", info->name); - cl->device.platform_data = info->platform_data; - if (info->archdata) - cl->device.archdata = *info->archdata; - if (device_register(&cl->device) < 0) { - pr_err("hsi: failed to register client: %s\n", info->name); - put_device(&cl->device); - } -} - -static void hsi_scan_board_info(struct hsi_controller *hsi) -{ - struct hsi_cl_info *cl_info; - struct hsi_port *p; - - list_for_each_entry(cl_info, &hsi_board_list, list) - if (cl_info->info.hsi_id == hsi->id) { - p = hsi_find_port_num(hsi, cl_info->info.port); - if (!p) - continue; - hsi_new_client(p, &cl_info->info); - } -} - -static int hsi_remove_client(struct device *dev, void *data __maybe_unused) -{ - device_unregister(dev); - - return 0; -} - -static int hsi_remove_port(struct device *dev, void *data __maybe_unused) -{ - device_for_each_child(dev, NULL, hsi_remove_client); - device_unregister(dev); - - return 0; -} - -static void hsi_controller_release(struct device *dev) -{ - struct hsi_controller *hsi = to_hsi_controller(dev); - - kfree(hsi->port); - kfree(hsi); -} - -static void hsi_port_release(struct device *dev) -{ - kfree(to_hsi_port(dev)); -} - -/** - * hsi_unregister_controller - Unregister an HSI controller - * @hsi: The HSI controller to register - */ -void hsi_unregister_controller(struct hsi_controller *hsi) -{ - device_for_each_child(&hsi->device, NULL, hsi_remove_port); - device_unregister(&hsi->device); -} -EXPORT_SYMBOL_GPL(hsi_unregister_controller); - -/** - * hsi_register_controller - Register an HSI controller and its ports - * @hsi: The HSI controller to register - * - * Returns -errno on failure, 0 on success. - */ -int hsi_register_controller(struct hsi_controller *hsi) -{ - unsigned int i; - int err; - - err = device_add(&hsi->device); - if (err < 0) - return err; - for (i = 0; i < hsi->num_ports; i++) { - hsi->port[i]->device.parent = &hsi->device; - err = device_add(&hsi->port[i]->device); - if (err < 0) - goto out; - } - /* Populate HSI bus with HSI clients */ - hsi_scan_board_info(hsi); - - return 0; -out: - while (i-- > 0) - device_del(&hsi->port[i]->device); - device_del(&hsi->device); - - return err; -} -EXPORT_SYMBOL_GPL(hsi_register_controller); - -/** - * hsi_register_client_driver - Register an HSI client to the HSI bus - * @drv: HSI client driver to register - * - * Returns -errno on failure, 0 on success. - */ -int hsi_register_client_driver(struct hsi_client_driver *drv) -{ - drv->driver.bus = &hsi_bus_type; - - return driver_register(&drv->driver); -} -EXPORT_SYMBOL_GPL(hsi_register_client_driver); - -static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused) -{ - return 0; -} - -static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused) -{ - return 0; -} - -/** - * hsi_put_controller - Free an HSI controller - * - * @hsi: Pointer to the HSI controller to freed - * - * HSI controller drivers should only use this function if they need - * to free their allocated hsi_controller structures before a successful - * call to hsi_register_controller. Other use is not allowed. - */ -void hsi_put_controller(struct hsi_controller *hsi) -{ - unsigned int i; - - if (!hsi) - return; - - for (i = 0; i < hsi->num_ports; i++) - if (hsi->port && hsi->port[i]) - put_device(&hsi->port[i]->device); - put_device(&hsi->device); -} -EXPORT_SYMBOL_GPL(hsi_put_controller); - -/** - * hsi_alloc_controller - Allocate an HSI controller and its ports - * @n_ports: Number of ports on the HSI controller - * @flags: Kernel allocation flags - * - * Return NULL on failure or a pointer to an hsi_controller on success. - */ -struct hsi_controller *hsi_alloc_controller(unsigned int n_ports, gfp_t flags) -{ - struct hsi_controller *hsi; - struct hsi_port **port; - unsigned int i; - - if (!n_ports) - return NULL; - - hsi = kzalloc(sizeof(*hsi), flags); - if (!hsi) - return NULL; - port = kzalloc(sizeof(*port)*n_ports, flags); - if (!port) { - kfree(hsi); - return NULL; - } - hsi->num_ports = n_ports; - hsi->port = port; - hsi->device.release = hsi_controller_release; - device_initialize(&hsi->device); - - for (i = 0; i < n_ports; i++) { - port[i] = kzalloc(sizeof(**port), flags); - if (port[i] == NULL) - goto out; - port[i]->num = i; - port[i]->async = hsi_dummy_msg; - port[i]->setup = hsi_dummy_cl; - port[i]->flush = hsi_dummy_cl; - port[i]->start_tx = hsi_dummy_cl; - port[i]->stop_tx = hsi_dummy_cl; - port[i]->release = hsi_dummy_cl; - mutex_init(&port[i]->lock); - ATOMIC_INIT_NOTIFIER_HEAD(&port[i]->n_head); - dev_set_name(&port[i]->device, "port%d", i); - hsi->port[i]->device.release = hsi_port_release; - device_initialize(&hsi->port[i]->device); - } - - return hsi; -out: - hsi_put_controller(hsi); - - return NULL; -} -EXPORT_SYMBOL_GPL(hsi_alloc_controller); - -/** - * hsi_free_msg - Free an HSI message - * @msg: Pointer to the HSI message - * - * Client is responsible to free the buffers pointed by the scatterlists. - */ -void hsi_free_msg(struct hsi_msg *msg) -{ - if (!msg) - return; - sg_free_table(&msg->sgt); - kfree(msg); -} -EXPORT_SYMBOL_GPL(hsi_free_msg); - -/** - * hsi_alloc_msg - Allocate an HSI message - * @nents: Number of memory entries - * @flags: Kernel allocation flags - * - * nents can be 0. This mainly makes sense for read transfer. - * In that case, HSI drivers will call the complete callback when - * there is data to be read without consuming it. - * - * Return NULL on failure or a pointer to an hsi_msg on success. - */ -struct hsi_msg *hsi_alloc_msg(unsigned int nents, gfp_t flags) -{ - struct hsi_msg *msg; - int err; - - msg = kzalloc(sizeof(*msg), flags); - if (!msg) - return NULL; - - if (!nents) - return msg; - - err = sg_alloc_table(&msg->sgt, nents, flags); - if (unlikely(err)) { - kfree(msg); - msg = NULL; - } - - return msg; -} -EXPORT_SYMBOL_GPL(hsi_alloc_msg); - -/** - * hsi_async - Submit an HSI transfer to the controller - * @cl: HSI client sending the transfer - * @msg: The HSI transfer passed to controller - * - * The HSI message must have the channel, ttype, complete and destructor - * fields set beforehand. If nents > 0 then the client has to initialize - * also the scatterlists to point to the buffers to write to or read from. - * - * HSI controllers relay on pre-allocated buffers from their clients and they - * do not allocate buffers on their own. - * - * Once the HSI message transfer finishes, the HSI controller calls the - * complete callback with the status and actual_len fields of the HSI message - * updated. The complete callback can be called before returning from - * hsi_async. - * - * Returns -errno on failure or 0 on success - */ -int hsi_async(struct hsi_client *cl, struct hsi_msg *msg) -{ - struct hsi_port *port = hsi_get_port(cl); - - if (!hsi_port_claimed(cl)) - return -EACCES; - - WARN_ON_ONCE(!msg->destructor || !msg->complete); - msg->cl = cl; - - return port->async(msg); -} -EXPORT_SYMBOL_GPL(hsi_async); - -/** - * hsi_claim_port - Claim the HSI client's port - * @cl: HSI client that wants to claim its port - * @share: Flag to indicate if the client wants to share the port or not. - * - * Returns -errno on failure, 0 on success. - */ -int hsi_claim_port(struct hsi_client *cl, unsigned int share) -{ - struct hsi_port *port = hsi_get_port(cl); - int err = 0; - - mutex_lock(&port->lock); - if ((port->claimed) && (!port->shared || !share)) { - err = -EBUSY; - goto out; - } - if (!try_module_get(to_hsi_controller(port->device.parent)->owner)) { - err = -ENODEV; - goto out; - } - port->claimed++; - port->shared = !!share; - cl->pclaimed = 1; -out: - mutex_unlock(&port->lock); - - return err; -} -EXPORT_SYMBOL_GPL(hsi_claim_port); - -/** - * hsi_release_port - Release the HSI client's port - * @cl: HSI client which previously claimed its port - */ -void hsi_release_port(struct hsi_client *cl) -{ - struct hsi_port *port = hsi_get_port(cl); - - mutex_lock(&port->lock); - /* Allow HW driver to do some cleanup */ - port->release(cl); - if (cl->pclaimed) - port->claimed--; - BUG_ON(port->claimed < 0); - cl->pclaimed = 0; - if (!port->claimed) - port->shared = 0; - module_put(to_hsi_controller(port->device.parent)->owner); - mutex_unlock(&port->lock); -} -EXPORT_SYMBOL_GPL(hsi_release_port); - -static int hsi_event_notifier_call(struct notifier_block *nb, - unsigned long event, void *data __maybe_unused) -{ - struct hsi_client *cl = container_of(nb, struct hsi_client, nb); - - (*cl->ehandler)(cl, event); - - return 0; -} - -/** - * hsi_register_port_event - Register a client to receive port events - * @cl: HSI client that wants to receive port events - * @handler: Event handler callback - * - * Clients should register a callback to be able to receive - * events from the ports. Registration should happen after - * claiming the port. - * The handler can be called in interrupt context. - * - * Returns -errno on error, or 0 on success. - */ -int hsi_register_port_event(struct hsi_client *cl, - void (*handler)(struct hsi_client *, unsigned long)) -{ - struct hsi_port *port = hsi_get_port(cl); - - if (!handler || cl->ehandler) - return -EINVAL; - if (!hsi_port_claimed(cl)) - return -EACCES; - cl->ehandler = handler; - cl->nb.notifier_call = hsi_event_notifier_call; - - return atomic_notifier_chain_register(&port->n_head, &cl->nb); -} -EXPORT_SYMBOL_GPL(hsi_register_port_event); - -/** - * hsi_unregister_port_event - Stop receiving port events for a client - * @cl: HSI client that wants to stop receiving port events - * - * Clients should call this function before releasing their associated - * port. - * - * Returns -errno on error, or 0 on success. - */ -int hsi_unregister_port_event(struct hsi_client *cl) -{ - struct hsi_port *port = hsi_get_port(cl); - int err; - - WARN_ON(!hsi_port_claimed(cl)); - - err = atomic_notifier_chain_unregister(&port->n_head, &cl->nb); - if (!err) - cl->ehandler = NULL; - - return err; -} -EXPORT_SYMBOL_GPL(hsi_unregister_port_event); - -/** - * hsi_event -Notifies clients about port events - * @port: Port where the event occurred - * @event: The event type - * - * Clients should not be concerned about wake line behavior. However, due - * to a race condition in HSI HW protocol, clients need to be notified - * about wake line changes, so they can implement a workaround for it. - * - * Events: - * HSI_EVENT_START_RX - Incoming wake line high - * HSI_EVENT_STOP_RX - Incoming wake line down - * - * Returns -errno on error, or 0 on success. - */ -int hsi_event(struct hsi_port *port, unsigned long event) -{ - return atomic_notifier_call_chain(&port->n_head, event, NULL); -} -EXPORT_SYMBOL_GPL(hsi_event); - -static int __init hsi_init(void) -{ - return bus_register(&hsi_bus_type); -} -postcore_initcall(hsi_init); - -static void __exit hsi_exit(void) -{ - bus_unregister(&hsi_bus_type); -} -module_exit(hsi_exit); - -MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); -MODULE_DESCRIPTION("High-speed Synchronous Serial Interface (HSI) framework"); -MODULE_LICENSE("GPL v2"); |