cregit-Linux how code gets into the kernel

Release 4.10 drivers/hsi/hsi_core.c

Directory: drivers/hsi
/*
 * 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 <linux/of.h>
#include <linux/of_device.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)); }

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static DEVICE_ATTR_RO(modalias); static struct attribute *hsi_bus_dev_attrs[] = { &dev_attr_modalias.attr, NULL, }; ATTRIBUTE_GROUPS(hsi_bus_dev);
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; }

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static int hsi_bus_match(struct device *dev, struct device_driver *driver) { if (of_driver_match_device(dev, driver)) return true; if (strcmp(dev_name(dev), driver->name) == 0) return true; return false; }

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static struct bus_type hsi_bus_type = { .name = "hsi", .dev_groups = hsi_bus_dev_groups, .match = hsi_bus_match, .uevent = hsi_bus_uevent, };
static void hsi_client_release(struct device *dev) { struct hsi_client *cl = to_hsi_client(dev); kfree(cl->tx_cfg.channels); kfree(cl->rx_cfg.channels); kfree(cl); }

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struct hsi_client *hsi_new_client(struct hsi_port *port, struct hsi_board_info *info) { struct hsi_client *cl; size_t size; cl = kzalloc(sizeof(*cl), GFP_KERNEL); if (!cl) goto err; cl->tx_cfg = info->tx_cfg; if (cl->tx_cfg.channels) { size = cl->tx_cfg.num_channels * sizeof(*cl->tx_cfg.channels); cl->tx_cfg.channels = kmemdup(info->tx_cfg.channels, size, GFP_KERNEL); if (!cl->tx_cfg.channels) goto err_tx; } cl->rx_cfg = info->rx_cfg; if (cl->rx_cfg.channels) { size = cl->rx_cfg.num_channels * sizeof(*cl->rx_cfg.channels); cl->rx_cfg.channels = kmemdup(info->rx_cfg.channels, size, GFP_KERNEL); if (!cl->rx_cfg.channels) goto err_rx; } 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); } return cl; err_rx: kfree(cl->tx_cfg.channels); err_tx: kfree(cl); err: return NULL; }

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kees cookkees cook20.65%114.29%
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EXPORT_SYMBOL_GPL(hsi_new_client);
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); } }

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#ifdef CONFIG_OF static struct hsi_board_info hsi_char_dev_info = { .name = "hsi_char", };
static int hsi_of_property_parse_mode(struct device_node *client, char *name, unsigned int *result) { const char *mode; int err; err = of_property_read_string(client, name, &mode); if (err < 0) return err; if (strcmp(mode, "stream") == 0) *result = HSI_MODE_STREAM; else if (strcmp(mode, "frame") == 0) *result = HSI_MODE_FRAME; else return -EINVAL; return 0; }

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static int hsi_of_property_parse_flow(struct device_node *client, char *name, unsigned int *result) { const char *flow; int err; err = of_property_read_string(client, name, &flow); if (err < 0) return err; if (strcmp(flow, "synchronized") == 0) *result = HSI_FLOW_SYNC; else if (strcmp(flow, "pipeline") == 0) *result = HSI_FLOW_PIPE; else return -EINVAL; return 0; }

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static int hsi_of_property_parse_arb_mode(struct device_node *client, char *name, unsigned int *result) { const char *arb_mode; int err; err = of_property_read_string(client, name, &arb_mode); if (err < 0) return err; if (strcmp(arb_mode, "round-robin") == 0) *result = HSI_ARB_RR; else if (strcmp(arb_mode, "priority") == 0) *result = HSI_ARB_PRIO; else return -EINVAL; return 0; }

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static void hsi_add_client_from_dt(struct hsi_port *port, struct device_node *client) { struct hsi_client *cl; struct hsi_channel channel; struct property *prop; char name[32]; int length, cells, err, i, max_chan, mode; cl = kzalloc(sizeof(*cl), GFP_KERNEL); if (!cl) return; err = of_modalias_node(client, name, sizeof(name)); if (err) goto err; dev_set_name(&cl->device, "%s", name); err = hsi_of_property_parse_mode(client, "hsi-mode", &mode); if (err) { err = hsi_of_property_parse_mode(client, "hsi-rx-mode", &cl->rx_cfg.mode); if (err) goto err; err = hsi_of_property_parse_mode(client, "hsi-tx-mode", &cl->tx_cfg.mode); if (err) goto err; } else { cl->rx_cfg.mode = mode; cl->tx_cfg.mode = mode; } err = of_property_read_u32(client, "hsi-speed-kbps", &cl->tx_cfg.speed); if (err) goto err; cl->rx_cfg.speed = cl->tx_cfg.speed; err = hsi_of_property_parse_flow(client, "hsi-flow", &cl->rx_cfg.flow); if (err) goto err; err = hsi_of_property_parse_arb_mode(client, "hsi-arb-mode", &cl->rx_cfg.arb_mode); if (err) goto err; prop = of_find_property(client, "hsi-channel-ids", &length); if (!prop) { err = -EINVAL; goto err; } cells = length / sizeof(u32); cl->rx_cfg.num_channels = cells; cl->tx_cfg.num_channels = cells; cl->rx_cfg.channels = kzalloc(cells * sizeof(channel), GFP_KERNEL); if (!cl->rx_cfg.channels) { err = -ENOMEM; goto err; } cl->tx_cfg.channels = kzalloc(cells * sizeof(channel), GFP_KERNEL); if (!cl->tx_cfg.channels) { err = -ENOMEM; goto err2; } max_chan = 0; for (i = 0; i < cells; i++) { err = of_property_read_u32_index(client, "hsi-channel-ids", i, &channel.id); if (err) goto err3; err = of_property_read_string_index(client, "hsi-channel-names", i, &channel.name); if (err) channel.name = NULL; if (channel.id > max_chan) max_chan = channel.id; cl->rx_cfg.channels[i] = channel; cl->tx_cfg.channels[i] = channel; } cl->rx_cfg.num_hw_channels = max_chan + 1; cl->tx_cfg.num_hw_channels = max_chan + 1; cl->device.bus = &hsi_bus_type; cl->device.parent = &port->device; cl->device.release = hsi_client_release; cl->device.of_node = client; if (device_register(&cl->device) < 0) { pr_err("hsi: failed to register client: %s\n", name); put_device(&cl->device); } return; err3: kfree(cl->tx_cfg.channels); err2: kfree(cl->rx_cfg.channels); err: kfree(cl); pr_err("hsi client: missing or incorrect of property: err=%d\n", err); }

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void hsi_add_clients_from_dt(struct hsi_port *port, struct device_node *clients) { struct device_node *child; /* register hsi-char device */ hsi_new_client(port, &hsi_char_dev_info); for_each_available_child_of_node(clients, child) hsi_add_client_from_dt(port, child); }

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EXPORT_SYMBOL_GPL(hsi_add_clients_from_dt); #endif
int hsi_remove_client(struct device *dev, void *data __maybe_unused) { device_unregister(dev); return 0; }

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EXPORT_SYMBOL_GPL(hsi_remove_client);
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; }

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static void hsi_controller_release(struct device *dev) { struct hsi_controller *hsi = to_hsi_controller(dev); kfree(hsi->port); kfree(hsi); }

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static void hsi_port_release(struct device *dev) { kfree(to_hsi_port(dev)); }

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/** * hsi_unregister_port - Unregister an HSI port * @port: The HSI port to unregister */
void hsi_port_unregister_clients(struct hsi_port *port) { device_for_each_child(&port->device, NULL, hsi_remove_client); }

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EXPORT_SYMBOL_GPL(hsi_port_unregister_clients); /** * 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); }

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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; }

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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); }

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EXPORT_SYMBOL_GPL(hsi_register_client_driver);
static inline int hsi_dummy_msg(struct hsi_msg *msg __maybe_unused) { return 0; }

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static inline int hsi_dummy_cl(struct hsi_client *cl __maybe_unused) { return 0; }

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/** * 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); }

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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); BLOCKING_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; }

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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); }

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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; }

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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); }

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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; }

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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); }

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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; }

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/** * 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 blocking_notifier_chain_register(&port->n_head, &cl->nb); }

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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 = blocking_notifier_chain_unregister(&port->n_head, &cl->nb); if (!err) cl->ehandler = NULL; return err; }

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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 blocking_notifier_call_chain(&port->n_head, event, NULL); }

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EXPORT_SYMBOL_GPL(hsi_event); /** * hsi_get_channel_id_by_name - acquire channel id by channel name * @cl: HSI client, which uses the channel * @name: name the channel is known under * * Clients can call this function to get the hsi channel ids similar to * requesting IRQs or GPIOs by name. This function assumes the same * channel configuration is used for RX and TX. * * Returns -errno on error or channel id on success. */
int hsi_get_channel_id_by_name(struct hsi_client *cl, char *name) { int i; if (!cl->rx_cfg.channels) return -ENOENT; for (i = 0; i < cl->rx_cfg.num_channels; i++) if (!strcmp(cl->rx_cfg.channels[i].name, name)) return cl->rx_cfg.channels[i].id; return -ENXIO; }

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EXPORT_SYMBOL_GPL(hsi_get_channel_id_by_name);
static int __init hsi_init(void) { return bus_register(&hsi_bus_type); }

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postcore_initcall(hsi_init);
static void __exit hsi_exit(void) { bus_unregister(&hsi_bus_type); }

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carlos chineacarlos chinea15100.00%1100.00%
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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");

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greg kroah-hartmangreg kroah-hartman200.63%17.14%
muhammad falak r wanimuhammad falak r wani140.44%17.14%
kees cookkees cook20.06%17.14%
randy dunlaprandy dunlap10.03%17.14%
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Directory: drivers/hsi
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