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724 lines
18 KiB
724 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* configfs.c - Implementation of configfs interface to the driver stack |
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* |
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* Copyright (C) 2013-2015 Microchip Technology Germany II GmbH & Co. KG |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/configfs.h> |
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#include <linux/most.h> |
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|
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#define MAX_STRING_SIZE 80 |
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struct mdev_link { |
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struct config_item item; |
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struct list_head list; |
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bool create_link; |
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bool destroy_link; |
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u16 num_buffers; |
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u16 buffer_size; |
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u16 subbuffer_size; |
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u16 packets_per_xact; |
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u16 dbr_size; |
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char datatype[MAX_STRING_SIZE]; |
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char direction[MAX_STRING_SIZE]; |
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char name[MAX_STRING_SIZE]; |
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char device[MAX_STRING_SIZE]; |
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char channel[MAX_STRING_SIZE]; |
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char comp[MAX_STRING_SIZE]; |
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char comp_params[MAX_STRING_SIZE]; |
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}; |
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|
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static struct list_head mdev_link_list; |
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|
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static int set_cfg_buffer_size(struct mdev_link *link) |
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{ |
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return most_set_cfg_buffer_size(link->device, link->channel, |
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link->buffer_size); |
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} |
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static int set_cfg_subbuffer_size(struct mdev_link *link) |
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{ |
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return most_set_cfg_subbuffer_size(link->device, link->channel, |
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link->subbuffer_size); |
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} |
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static int set_cfg_dbr_size(struct mdev_link *link) |
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{ |
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return most_set_cfg_dbr_size(link->device, link->channel, |
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link->dbr_size); |
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} |
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|
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static int set_cfg_num_buffers(struct mdev_link *link) |
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{ |
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return most_set_cfg_num_buffers(link->device, link->channel, |
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link->num_buffers); |
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} |
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|
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static int set_cfg_packets_xact(struct mdev_link *link) |
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{ |
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return most_set_cfg_packets_xact(link->device, link->channel, |
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link->packets_per_xact); |
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} |
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|
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static int set_cfg_direction(struct mdev_link *link) |
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{ |
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return most_set_cfg_direction(link->device, link->channel, |
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link->direction); |
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} |
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|
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static int set_cfg_datatype(struct mdev_link *link) |
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{ |
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return most_set_cfg_datatype(link->device, link->channel, |
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link->datatype); |
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} |
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static int (*set_config_val[])(struct mdev_link *link) = { |
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set_cfg_buffer_size, |
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set_cfg_subbuffer_size, |
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set_cfg_dbr_size, |
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set_cfg_num_buffers, |
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set_cfg_packets_xact, |
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set_cfg_direction, |
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set_cfg_datatype, |
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}; |
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static struct mdev_link *to_mdev_link(struct config_item *item) |
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{ |
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return container_of(item, struct mdev_link, item); |
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} |
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static int set_config_and_add_link(struct mdev_link *mdev_link) |
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{ |
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int i; |
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int ret; |
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|
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for (i = 0; i < ARRAY_SIZE(set_config_val); i++) { |
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ret = set_config_val[i](mdev_link); |
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if (ret < 0 && ret != -ENODEV) { |
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pr_err("Config failed\n"); |
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return ret; |
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} |
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} |
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return most_add_link(mdev_link->device, mdev_link->channel, |
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mdev_link->comp, mdev_link->name, |
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mdev_link->comp_params); |
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} |
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static ssize_t mdev_link_create_link_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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bool tmp; |
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int ret; |
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ret = kstrtobool(page, &tmp); |
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if (ret) |
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return ret; |
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if (!tmp) |
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return count; |
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ret = set_config_and_add_link(mdev_link); |
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if (ret && ret != -ENODEV) |
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return ret; |
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list_add_tail(&mdev_link->list, &mdev_link_list); |
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mdev_link->create_link = tmp; |
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mdev_link->destroy_link = false; |
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|
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return count; |
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} |
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static ssize_t mdev_link_destroy_link_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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bool tmp; |
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int ret; |
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ret = kstrtobool(page, &tmp); |
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if (ret) |
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return ret; |
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if (!tmp) |
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return count; |
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ret = most_remove_link(mdev_link->device, mdev_link->channel, |
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mdev_link->comp); |
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if (ret) |
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return ret; |
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if (!list_empty(&mdev_link_list)) |
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list_del(&mdev_link->list); |
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mdev_link->destroy_link = tmp; |
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return count; |
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} |
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static ssize_t mdev_link_direction_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->direction); |
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} |
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static ssize_t mdev_link_direction_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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|
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if (!sysfs_streq(page, "dir_rx") && !sysfs_streq(page, "rx") && |
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!sysfs_streq(page, "dir_tx") && !sysfs_streq(page, "tx")) |
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return -EINVAL; |
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strcpy(mdev_link->direction, page); |
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strim(mdev_link->direction); |
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return count; |
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} |
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static ssize_t mdev_link_datatype_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->datatype); |
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} |
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static ssize_t mdev_link_datatype_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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|
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if (!sysfs_streq(page, "control") && !sysfs_streq(page, "async") && |
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!sysfs_streq(page, "sync") && !sysfs_streq(page, "isoc") && |
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!sysfs_streq(page, "isoc_avp")) |
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return -EINVAL; |
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strcpy(mdev_link->datatype, page); |
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strim(mdev_link->datatype); |
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return count; |
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} |
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static ssize_t mdev_link_device_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->device); |
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} |
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static ssize_t mdev_link_device_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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|
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strlcpy(mdev_link->device, page, sizeof(mdev_link->device)); |
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strim(mdev_link->device); |
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return count; |
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} |
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static ssize_t mdev_link_channel_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->channel); |
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} |
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static ssize_t mdev_link_channel_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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|
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strlcpy(mdev_link->channel, page, sizeof(mdev_link->channel)); |
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strim(mdev_link->channel); |
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return count; |
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} |
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static ssize_t mdev_link_comp_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%s\n", to_mdev_link(item)->comp); |
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} |
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static ssize_t mdev_link_comp_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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|
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strlcpy(mdev_link->comp, page, sizeof(mdev_link->comp)); |
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strim(mdev_link->comp); |
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return count; |
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} |
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static ssize_t mdev_link_comp_params_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%s\n", |
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to_mdev_link(item)->comp_params); |
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} |
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static ssize_t mdev_link_comp_params_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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|
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strlcpy(mdev_link->comp_params, page, sizeof(mdev_link->comp_params)); |
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strim(mdev_link->comp_params); |
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return count; |
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} |
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static ssize_t mdev_link_num_buffers_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%d\n", |
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to_mdev_link(item)->num_buffers); |
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} |
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static ssize_t mdev_link_num_buffers_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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int ret; |
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ret = kstrtou16(page, 0, &mdev_link->num_buffers); |
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if (ret) |
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return ret; |
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return count; |
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} |
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static ssize_t mdev_link_buffer_size_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%d\n", |
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to_mdev_link(item)->buffer_size); |
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} |
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static ssize_t mdev_link_buffer_size_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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int ret; |
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ret = kstrtou16(page, 0, &mdev_link->buffer_size); |
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if (ret) |
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return ret; |
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return count; |
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} |
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static ssize_t mdev_link_subbuffer_size_show(struct config_item *item, |
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char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%d\n", |
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to_mdev_link(item)->subbuffer_size); |
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} |
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static ssize_t mdev_link_subbuffer_size_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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int ret; |
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ret = kstrtou16(page, 0, &mdev_link->subbuffer_size); |
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if (ret) |
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return ret; |
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return count; |
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} |
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static ssize_t mdev_link_packets_per_xact_show(struct config_item *item, |
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char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%d\n", |
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to_mdev_link(item)->packets_per_xact); |
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} |
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static ssize_t mdev_link_packets_per_xact_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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int ret; |
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|
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ret = kstrtou16(page, 0, &mdev_link->packets_per_xact); |
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if (ret) |
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return ret; |
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return count; |
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} |
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static ssize_t mdev_link_dbr_size_show(struct config_item *item, char *page) |
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{ |
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return snprintf(page, PAGE_SIZE, "%d\n", to_mdev_link(item)->dbr_size); |
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} |
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static ssize_t mdev_link_dbr_size_store(struct config_item *item, |
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const char *page, size_t count) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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int ret; |
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|
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ret = kstrtou16(page, 0, &mdev_link->dbr_size); |
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if (ret) |
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return ret; |
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return count; |
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} |
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|
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CONFIGFS_ATTR_WO(mdev_link_, create_link); |
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CONFIGFS_ATTR_WO(mdev_link_, destroy_link); |
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CONFIGFS_ATTR(mdev_link_, device); |
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CONFIGFS_ATTR(mdev_link_, channel); |
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CONFIGFS_ATTR(mdev_link_, comp); |
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CONFIGFS_ATTR(mdev_link_, comp_params); |
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CONFIGFS_ATTR(mdev_link_, num_buffers); |
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CONFIGFS_ATTR(mdev_link_, buffer_size); |
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CONFIGFS_ATTR(mdev_link_, subbuffer_size); |
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CONFIGFS_ATTR(mdev_link_, packets_per_xact); |
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CONFIGFS_ATTR(mdev_link_, datatype); |
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CONFIGFS_ATTR(mdev_link_, direction); |
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CONFIGFS_ATTR(mdev_link_, dbr_size); |
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static struct configfs_attribute *mdev_link_attrs[] = { |
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&mdev_link_attr_create_link, |
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&mdev_link_attr_destroy_link, |
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&mdev_link_attr_device, |
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&mdev_link_attr_channel, |
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&mdev_link_attr_comp, |
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&mdev_link_attr_comp_params, |
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&mdev_link_attr_num_buffers, |
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&mdev_link_attr_buffer_size, |
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&mdev_link_attr_subbuffer_size, |
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&mdev_link_attr_packets_per_xact, |
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&mdev_link_attr_datatype, |
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&mdev_link_attr_direction, |
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&mdev_link_attr_dbr_size, |
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NULL, |
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}; |
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static void mdev_link_release(struct config_item *item) |
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{ |
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struct mdev_link *mdev_link = to_mdev_link(item); |
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int ret; |
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if (mdev_link->destroy_link) |
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goto free_item; |
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ret = most_remove_link(mdev_link->device, mdev_link->channel, |
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mdev_link->comp); |
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if (ret) { |
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pr_err("Removing link failed.\n"); |
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goto free_item; |
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} |
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if (!list_empty(&mdev_link_list)) |
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list_del(&mdev_link->list); |
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free_item: |
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kfree(to_mdev_link(item)); |
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} |
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static struct configfs_item_operations mdev_link_item_ops = { |
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.release = mdev_link_release, |
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}; |
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static const struct config_item_type mdev_link_type = { |
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.ct_item_ops = &mdev_link_item_ops, |
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.ct_attrs = mdev_link_attrs, |
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.ct_owner = THIS_MODULE, |
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}; |
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struct most_common { |
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struct config_group group; |
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struct module *mod; |
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struct configfs_subsystem subsys; |
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}; |
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static struct most_common *to_most_common(struct configfs_subsystem *subsys) |
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{ |
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return container_of(subsys, struct most_common, subsys); |
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} |
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static struct config_item *most_common_make_item(struct config_group *group, |
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const char *name) |
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{ |
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struct mdev_link *mdev_link; |
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struct most_common *mc = to_most_common(group->cg_subsys); |
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|
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mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL); |
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if (!mdev_link) |
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return ERR_PTR(-ENOMEM); |
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|
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if (!try_module_get(mc->mod)) { |
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kfree(mdev_link); |
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return ERR_PTR(-ENOLCK); |
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} |
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config_item_init_type_name(&mdev_link->item, name, |
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&mdev_link_type); |
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|
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if (!strcmp(group->cg_item.ci_namebuf, "most_cdev")) |
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strcpy(mdev_link->comp, "cdev"); |
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else if (!strcmp(group->cg_item.ci_namebuf, "most_net")) |
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strcpy(mdev_link->comp, "net"); |
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else if (!strcmp(group->cg_item.ci_namebuf, "most_video")) |
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strcpy(mdev_link->comp, "video"); |
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strcpy(mdev_link->name, name); |
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return &mdev_link->item; |
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} |
|
|
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static void most_common_release(struct config_item *item) |
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{ |
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struct config_group *group = to_config_group(item); |
|
|
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kfree(to_most_common(group->cg_subsys)); |
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} |
|
|
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static struct configfs_item_operations most_common_item_ops = { |
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.release = most_common_release, |
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}; |
|
|
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static void most_common_disconnect(struct config_group *group, |
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struct config_item *item) |
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{ |
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struct most_common *mc = to_most_common(group->cg_subsys); |
|
|
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module_put(mc->mod); |
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} |
|
|
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static struct configfs_group_operations most_common_group_ops = { |
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.make_item = most_common_make_item, |
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.disconnect_notify = most_common_disconnect, |
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}; |
|
|
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static const struct config_item_type most_common_type = { |
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.ct_item_ops = &most_common_item_ops, |
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.ct_group_ops = &most_common_group_ops, |
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.ct_owner = THIS_MODULE, |
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}; |
|
|
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static struct most_common most_cdev = { |
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.subsys = { |
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.su_group = { |
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.cg_item = { |
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.ci_namebuf = "most_cdev", |
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.ci_type = &most_common_type, |
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}, |
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}, |
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}, |
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}; |
|
|
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static struct most_common most_net = { |
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.subsys = { |
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.su_group = { |
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.cg_item = { |
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.ci_namebuf = "most_net", |
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.ci_type = &most_common_type, |
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}, |
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}, |
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}, |
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}; |
|
|
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static struct most_common most_video = { |
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.subsys = { |
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.su_group = { |
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.cg_item = { |
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.ci_namebuf = "most_video", |
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.ci_type = &most_common_type, |
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}, |
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}, |
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}, |
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}; |
|
|
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struct most_snd_grp { |
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struct config_group group; |
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bool create_card; |
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struct list_head list; |
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}; |
|
|
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static struct most_snd_grp *to_most_snd_grp(struct config_item *item) |
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{ |
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return container_of(to_config_group(item), struct most_snd_grp, group); |
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} |
|
|
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static struct config_item *most_snd_grp_make_item(struct config_group *group, |
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const char *name) |
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{ |
|
struct mdev_link *mdev_link; |
|
|
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mdev_link = kzalloc(sizeof(*mdev_link), GFP_KERNEL); |
|
if (!mdev_link) |
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return ERR_PTR(-ENOMEM); |
|
|
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config_item_init_type_name(&mdev_link->item, name, &mdev_link_type); |
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mdev_link->create_link = false; |
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strcpy(mdev_link->name, name); |
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strcpy(mdev_link->comp, "sound"); |
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return &mdev_link->item; |
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} |
|
|
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static ssize_t most_snd_grp_create_card_store(struct config_item *item, |
|
const char *page, size_t count) |
|
{ |
|
struct most_snd_grp *snd_grp = to_most_snd_grp(item); |
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int ret; |
|
bool tmp; |
|
|
|
ret = kstrtobool(page, &tmp); |
|
if (ret) |
|
return ret; |
|
if (tmp) { |
|
ret = most_cfg_complete("sound"); |
|
if (ret) |
|
return ret; |
|
} |
|
snd_grp->create_card = tmp; |
|
return count; |
|
} |
|
|
|
CONFIGFS_ATTR_WO(most_snd_grp_, create_card); |
|
|
|
static struct configfs_attribute *most_snd_grp_attrs[] = { |
|
&most_snd_grp_attr_create_card, |
|
NULL, |
|
}; |
|
|
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static void most_snd_grp_release(struct config_item *item) |
|
{ |
|
struct most_snd_grp *group = to_most_snd_grp(item); |
|
|
|
list_del(&group->list); |
|
kfree(group); |
|
} |
|
|
|
static struct configfs_item_operations most_snd_grp_item_ops = { |
|
.release = most_snd_grp_release, |
|
}; |
|
|
|
static struct configfs_group_operations most_snd_grp_group_ops = { |
|
.make_item = most_snd_grp_make_item, |
|
}; |
|
|
|
static const struct config_item_type most_snd_grp_type = { |
|
.ct_item_ops = &most_snd_grp_item_ops, |
|
.ct_group_ops = &most_snd_grp_group_ops, |
|
.ct_attrs = most_snd_grp_attrs, |
|
.ct_owner = THIS_MODULE, |
|
}; |
|
|
|
struct most_sound { |
|
struct configfs_subsystem subsys; |
|
struct list_head soundcard_list; |
|
struct module *mod; |
|
}; |
|
|
|
static struct config_group *most_sound_make_group(struct config_group *group, |
|
const char *name) |
|
{ |
|
struct most_snd_grp *most; |
|
struct most_sound *ms = container_of(group->cg_subsys, |
|
struct most_sound, subsys); |
|
|
|
list_for_each_entry(most, &ms->soundcard_list, list) { |
|
if (!most->create_card) { |
|
pr_info("adapter configuration still in progress.\n"); |
|
return ERR_PTR(-EPROTO); |
|
} |
|
} |
|
if (!try_module_get(ms->mod)) |
|
return ERR_PTR(-ENOLCK); |
|
most = kzalloc(sizeof(*most), GFP_KERNEL); |
|
if (!most) { |
|
module_put(ms->mod); |
|
return ERR_PTR(-ENOMEM); |
|
} |
|
config_group_init_type_name(&most->group, name, &most_snd_grp_type); |
|
list_add_tail(&most->list, &ms->soundcard_list); |
|
return &most->group; |
|
} |
|
|
|
static void most_sound_disconnect(struct config_group *group, |
|
struct config_item *item) |
|
{ |
|
struct most_sound *ms = container_of(group->cg_subsys, |
|
struct most_sound, subsys); |
|
module_put(ms->mod); |
|
} |
|
|
|
static struct configfs_group_operations most_sound_group_ops = { |
|
.make_group = most_sound_make_group, |
|
.disconnect_notify = most_sound_disconnect, |
|
}; |
|
|
|
static const struct config_item_type most_sound_type = { |
|
.ct_group_ops = &most_sound_group_ops, |
|
.ct_owner = THIS_MODULE, |
|
}; |
|
|
|
static struct most_sound most_sound_subsys = { |
|
.subsys = { |
|
.su_group = { |
|
.cg_item = { |
|
.ci_namebuf = "most_sound", |
|
.ci_type = &most_sound_type, |
|
}, |
|
}, |
|
}, |
|
}; |
|
|
|
int most_register_configfs_subsys(struct most_component *c) |
|
{ |
|
int ret; |
|
|
|
if (!strcmp(c->name, "cdev")) { |
|
most_cdev.mod = c->mod; |
|
ret = configfs_register_subsystem(&most_cdev.subsys); |
|
} else if (!strcmp(c->name, "net")) { |
|
most_net.mod = c->mod; |
|
ret = configfs_register_subsystem(&most_net.subsys); |
|
} else if (!strcmp(c->name, "video")) { |
|
most_video.mod = c->mod; |
|
ret = configfs_register_subsystem(&most_video.subsys); |
|
} else if (!strcmp(c->name, "sound")) { |
|
most_sound_subsys.mod = c->mod; |
|
ret = configfs_register_subsystem(&most_sound_subsys.subsys); |
|
} else { |
|
return -ENODEV; |
|
} |
|
|
|
if (ret) { |
|
pr_err("Error %d while registering subsystem %s\n", |
|
ret, c->name); |
|
} |
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(most_register_configfs_subsys); |
|
|
|
void most_interface_register_notify(const char *mdev) |
|
{ |
|
bool register_snd_card = false; |
|
struct mdev_link *mdev_link; |
|
|
|
list_for_each_entry(mdev_link, &mdev_link_list, list) { |
|
if (!strcmp(mdev_link->device, mdev)) { |
|
set_config_and_add_link(mdev_link); |
|
if (!strcmp(mdev_link->comp, "sound")) |
|
register_snd_card = true; |
|
} |
|
} |
|
if (register_snd_card) |
|
most_cfg_complete("sound"); |
|
} |
|
|
|
void most_deregister_configfs_subsys(struct most_component *c) |
|
{ |
|
if (!strcmp(c->name, "cdev")) |
|
configfs_unregister_subsystem(&most_cdev.subsys); |
|
else if (!strcmp(c->name, "net")) |
|
configfs_unregister_subsystem(&most_net.subsys); |
|
else if (!strcmp(c->name, "video")) |
|
configfs_unregister_subsystem(&most_video.subsys); |
|
else if (!strcmp(c->name, "sound")) |
|
configfs_unregister_subsystem(&most_sound_subsys.subsys); |
|
} |
|
EXPORT_SYMBOL_GPL(most_deregister_configfs_subsys); |
|
|
|
int __init configfs_init(void) |
|
{ |
|
config_group_init(&most_cdev.subsys.su_group); |
|
mutex_init(&most_cdev.subsys.su_mutex); |
|
|
|
config_group_init(&most_net.subsys.su_group); |
|
mutex_init(&most_net.subsys.su_mutex); |
|
|
|
config_group_init(&most_video.subsys.su_group); |
|
mutex_init(&most_video.subsys.su_mutex); |
|
|
|
config_group_init(&most_sound_subsys.subsys.su_group); |
|
mutex_init(&most_sound_subsys.subsys.su_mutex); |
|
|
|
INIT_LIST_HEAD(&most_sound_subsys.soundcard_list); |
|
INIT_LIST_HEAD(&mdev_link_list); |
|
|
|
return 0; |
|
}
|
|
|