diff options
Diffstat (limited to 'drivers/hid/intel-ish-hid/ishtp/init.c')
| -rw-r--r-- | drivers/hid/intel-ish-hid/ishtp/init.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/drivers/hid/intel-ish-hid/ishtp/init.c b/drivers/hid/intel-ish-hid/ishtp/init.c new file mode 100644 index 000000000000..ac364418e17c --- /dev/null +++ b/drivers/hid/intel-ish-hid/ishtp/init.c @@ -0,0 +1,115 @@ +/* + * Initialization protocol for ISHTP driver + * + * Copyright (c) 2003-2016, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + */ + +#include <linux/export.h> +#include <linux/slab.h> +#include <linux/sched.h> +#include <linux/miscdevice.h> +#include "ishtp-dev.h" +#include "hbm.h" +#include "client.h" + +/** + * ishtp_dev_state_str() -Convert to string format + * @state: state to convert + * + * Convert state to string for prints + * + * Return: character pointer to converted string + */ +const char *ishtp_dev_state_str(int state) +{ + switch (state) { + case ISHTP_DEV_INITIALIZING: + return "INITIALIZING"; + case ISHTP_DEV_INIT_CLIENTS: + return "INIT_CLIENTS"; + case ISHTP_DEV_ENABLED: + return "ENABLED"; + case ISHTP_DEV_RESETTING: + return "RESETTING"; + case ISHTP_DEV_DISABLED: + return "DISABLED"; + case ISHTP_DEV_POWER_DOWN: + return "POWER_DOWN"; + case ISHTP_DEV_POWER_UP: + return "POWER_UP"; + default: + return "unknown"; + } +} + +/** + * ishtp_device_init() - ishtp device init + * @dev: ISHTP device instance + * + * After ISHTP device is alloacted, this function is used to initialize + * each field which includes spin lock, work struct and lists + */ +void ishtp_device_init(struct ishtp_device *dev) +{ + dev->dev_state = ISHTP_DEV_INITIALIZING; + INIT_LIST_HEAD(&dev->cl_list); + INIT_LIST_HEAD(&dev->device_list); + dev->rd_msg_fifo_head = 0; + dev->rd_msg_fifo_tail = 0; + spin_lock_init(&dev->rd_msg_spinlock); + + init_waitqueue_head(&dev->wait_hbm_recvd_msg); + spin_lock_init(&dev->read_list_spinlock); + spin_lock_init(&dev->device_lock); + spin_lock_init(&dev->device_list_lock); + spin_lock_init(&dev->cl_list_lock); + spin_lock_init(&dev->fw_clients_lock); + INIT_WORK(&dev->bh_hbm_work, bh_hbm_work_fn); + + bitmap_zero(dev->host_clients_map, ISHTP_CLIENTS_MAX); + dev->open_handle_count = 0; + + /* + * Reserving client ID 0 for ISHTP Bus Message communications + */ + bitmap_set(dev->host_clients_map, 0, 1); + + INIT_LIST_HEAD(&dev->read_list.list); + +} +EXPORT_SYMBOL(ishtp_device_init); + +/** + * ishtp_start() - Start ISH processing + * @dev: ISHTP device instance + * + * Start ISHTP processing by sending query subscriber message + * + * Return: 0 on success else -ENODEV + */ +int ishtp_start(struct ishtp_device *dev) +{ + if (ishtp_hbm_start_wait(dev)) { + dev_err(dev->devc, "HBM haven't started"); + goto err; + } + + /* suspend & resume notification - send QUERY_SUBSCRIBERS msg */ + ishtp_query_subscribers(dev); + + return 0; +err: + dev_err(dev->devc, "link layer initialization failed.\n"); + dev->dev_state = ISHTP_DEV_DISABLED; + return -ENODEV; +} +EXPORT_SYMBOL(ishtp_start); |