cregit-Linux how code gets into the kernel

Release 4.14 drivers/hsi/clients/hsi_char.c

/*
 * HSI character device driver, implements the character device
 * interface.
 *
 * Copyright (C) 2010 Nokia Corporation. All rights reserved.
 *
 * Contact: Andras Domokos <andras.domokos@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/errno.h>
#include <linux/types.h>
#include <linux/atomic.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/kmemleak.h>
#include <linux/ioctl.h>
#include <linux/wait.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/uaccess.h>
#include <linux/scatterlist.h>
#include <linux/stat.h>
#include <linux/hsi/hsi.h>
#include <linux/hsi/hsi_char.h>


#define HSC_DEVS		16 
/* Num of channels */

#define HSC_MSGS		4


#define HSC_RXBREAK		0


#define HSC_ID_BITS		6

#define HSC_PORT_ID_BITS	4

#define HSC_ID_MASK		3

#define HSC_PORT_ID_MASK	3

#define HSC_CH_MASK		0xf

/*
 * We support up to 4 controllers that can have up to 4
 * ports, which should currently be more than enough.
 */

#define HSC_BASEMINOR(id, port_id) \
		((((id) & HSC_ID_MASK) << HSC_ID_BITS) | \
                (((port_id) & HSC_PORT_ID_MASK) << HSC_PORT_ID_BITS))

enum {
	
HSC_CH_OPEN,
	
HSC_CH_READ,
	
HSC_CH_WRITE,
	
HSC_CH_WLINE,
};

enum {
	
HSC_RX,
	
HSC_TX,
};

struct hsc_client_data;
/**
 * struct hsc_channel - hsi_char internal channel data
 * @ch: channel number
 * @flags: Keeps state of the channel (open/close, reading, writing)
 * @free_msgs_list: List of free HSI messages/requests
 * @rx_msgs_queue: List of pending RX requests
 * @tx_msgs_queue: List of pending TX requests
 * @lock: Serialize access to the lists
 * @cl: reference to the associated hsi_client
 * @cl_data: reference to the client data that this channels belongs to
 * @rx_wait: RX requests wait queue
 * @tx_wait: TX requests wait queue
 */

struct hsc_channel {
	
unsigned int		ch;
	
unsigned long		flags;
	
struct list_head	free_msgs_list;
	
struct list_head	rx_msgs_queue;
	
struct list_head	tx_msgs_queue;
	
spinlock_t		lock;
	
struct hsi_client	*cl;
	
struct hsc_client_data *cl_data;
	
wait_queue_head_t	rx_wait;
	
wait_queue_head_t	tx_wait;
};

/**
 * struct hsc_client_data - hsi_char internal client data
 * @cdev: Characther device associated to the hsi_client
 * @lock: Lock to serialize open/close access
 * @flags: Keeps track of port state (rx hwbreak armed)
 * @usecnt: Use count for claiming the HSI port (mutex protected)
 * @cl: Referece to the HSI client
 * @channels: Array of channels accessible by the client
 */

struct hsc_client_data {
	
struct cdev		cdev;
	
struct mutex		lock;
	
unsigned long		flags;
	
unsigned int		usecnt;
	
struct hsi_client	*cl;
	
struct hsc_channel	channels[HSC_DEVS];
};

/* Stores the major number dynamically allocated for hsi_char */

static unsigned int hsc_major;
/* Maximum buffer size that hsi_char will accept from userspace */

static unsigned int max_data_size = 0x1000;
module_param(max_data_size, uint, 0);
MODULE_PARM_DESC(max_data_size, "max read/write data size [4,8..65536] (^2)");


static void hsc_add_tail(struct hsc_channel *channel, struct hsi_msg *msg, struct list_head *queue) { unsigned long flags; spin_lock_irqsave(&channel->lock, flags); list_add_tail(&msg->link, queue); spin_unlock_irqrestore(&channel->lock, flags); }

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static struct hsi_msg *hsc_get_first_msg(struct hsc_channel *channel, struct list_head *queue) { struct hsi_msg *msg = NULL; unsigned long flags; spin_lock_irqsave(&channel->lock, flags); if (list_empty(queue)) goto out; msg = list_first_entry(queue, struct hsi_msg, link); list_del(&msg->link); out: spin_unlock_irqrestore(&channel->lock, flags); return msg; }

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static inline void hsc_msg_free(struct hsi_msg *msg) { kfree(sg_virt(msg->sgt.sgl)); hsi_free_msg(msg); }

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static void hsc_free_list(struct list_head *list) { struct hsi_msg *msg, *tmp; list_for_each_entry_safe(msg, tmp, list, link) { list_del(&msg->link); hsc_msg_free(msg); } }

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static void hsc_reset_list(struct hsc_channel *channel, struct list_head *l) { unsigned long flags; LIST_HEAD(list); spin_lock_irqsave(&channel->lock, flags); list_splice_init(l, &list); spin_unlock_irqrestore(&channel->lock, flags); hsc_free_list(&list); }

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static inline struct hsi_msg *hsc_msg_alloc(unsigned int alloc_size) { struct hsi_msg *msg; void *buf; msg = hsi_alloc_msg(1, GFP_KERNEL); if (!msg) goto out; buf = kmalloc(alloc_size, GFP_KERNEL); if (!buf) { hsi_free_msg(msg); goto out; } sg_init_one(msg->sgt.sgl, buf, alloc_size); /* Ignore false positive, due to sg pointer handling */ kmemleak_ignore(buf); return msg; out: return NULL; }

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static inline int hsc_msgs_alloc(struct hsc_channel *channel) { struct hsi_msg *msg; int i; for (i = 0; i < HSC_MSGS; i++) { msg = hsc_msg_alloc(max_data_size); if (!msg) goto out; msg->channel = channel->ch; list_add_tail(&msg->link, &channel->free_msgs_list); } return 0; out: hsc_free_list(&channel->free_msgs_list); return -ENOMEM; }

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static inline unsigned int hsc_msg_len_get(struct hsi_msg *msg) { return msg->sgt.sgl->length; }

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static inline void hsc_msg_len_set(struct hsi_msg *msg, unsigned int len) { msg->sgt.sgl->length = len; }

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static void hsc_rx_completed(struct hsi_msg *msg) { struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl); struct hsc_channel *channel = cl_data->channels + msg->channel; if (test_bit(HSC_CH_READ, &channel->flags)) { hsc_add_tail(channel, msg, &channel->rx_msgs_queue); wake_up(&channel->rx_wait); } else { hsc_add_tail(channel, msg, &channel->free_msgs_list); } }

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static void hsc_rx_msg_destructor(struct hsi_msg *msg) { msg->status = HSI_STATUS_ERROR; hsc_msg_len_set(msg, 0); hsc_rx_completed(msg); }

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static void hsc_tx_completed(struct hsi_msg *msg) { struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl); struct hsc_channel *channel = cl_data->channels + msg->channel; if (test_bit(HSC_CH_WRITE, &channel->flags)) { hsc_add_tail(channel, msg, &channel->tx_msgs_queue); wake_up(&channel->tx_wait); } else { hsc_add_tail(channel, msg, &channel->free_msgs_list); } }

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static void hsc_tx_msg_destructor(struct hsi_msg *msg) { msg->status = HSI_STATUS_ERROR; hsc_msg_len_set(msg, 0); hsc_tx_completed(msg); }

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static void hsc_break_req_destructor(struct hsi_msg *msg) { struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl); hsi_free_msg(msg); clear_bit(HSC_RXBREAK, &cl_data->flags); }

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static void hsc_break_received(struct hsi_msg *msg) { struct hsc_client_data *cl_data = hsi_client_drvdata(msg->cl); struct hsc_channel *channel = cl_data->channels; int i, ret; /* Broadcast HWBREAK on all channels */ for (i = 0; i < HSC_DEVS; i++, channel++) { struct hsi_msg *msg2; if (!test_bit(HSC_CH_READ, &channel->flags)) continue; msg2 = hsc_get_first_msg(channel, &channel->free_msgs_list); if (!msg2) continue; clear_bit(HSC_CH_READ, &channel->flags); hsc_msg_len_set(msg2, 0); msg2->status = HSI_STATUS_COMPLETED; hsc_add_tail(channel, msg2, &channel->rx_msgs_queue); wake_up(&channel->rx_wait); } hsi_flush(msg->cl); ret = hsi_async_read(msg->cl, msg); if (ret < 0) hsc_break_req_destructor(msg); }

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static int hsc_break_request(struct hsi_client *cl) { struct hsc_client_data *cl_data = hsi_client_drvdata(cl); struct hsi_msg *msg; int ret; if (test_and_set_bit(HSC_RXBREAK, &cl_data->flags)) return -EBUSY; msg = hsi_alloc_msg(0, GFP_KERNEL); if (!msg) { clear_bit(HSC_RXBREAK, &cl_data->flags); return -ENOMEM; } msg->break_frame = 1; msg->complete = hsc_break_received; msg->destructor = hsc_break_req_destructor; ret = hsi_async_read(cl, msg); if (ret < 0) hsc_break_req_destructor(msg); return ret; }

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static int hsc_break_send(struct hsi_client *cl) { struct hsi_msg *msg; int ret; msg = hsi_alloc_msg(0, GFP_ATOMIC); if (!msg) return -ENOMEM; msg->break_frame = 1; msg->complete = hsi_free_msg; msg->destructor = hsi_free_msg; ret = hsi_async_write(cl, msg); if (ret < 0) hsi_free_msg(msg); return ret; }

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static int hsc_rx_set(struct hsi_client *cl, struct hsc_rx_config *rxc) { struct hsi_config tmp; int ret; if ((rxc->mode != HSI_MODE_STREAM) && (rxc->mode != HSI_MODE_FRAME)) return -EINVAL; if ((rxc->channels == 0) || (rxc->channels > HSC_DEVS)) return -EINVAL; if (rxc->channels & (rxc->channels - 1)) return -EINVAL; if ((rxc->flow != HSI_FLOW_SYNC) && (rxc->flow != HSI_FLOW_PIPE)) return -EINVAL; tmp = cl->rx_cfg; cl->rx_cfg.mode = rxc->mode; cl->rx_cfg.num_hw_channels = rxc->channels; cl->rx_cfg.flow = rxc->flow; ret = hsi_setup(cl); if (ret < 0) { cl->rx_cfg = tmp; return ret; } if (rxc->mode == HSI_MODE_FRAME) hsc_break_request(cl); return ret; }

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static inline void hsc_rx_get(struct hsi_client *cl, struct hsc_rx_config *rxc) { rxc->mode = cl->rx_cfg.mode; rxc->channels = cl->rx_cfg.num_hw_channels; rxc->flow = cl->rx_cfg.flow; }

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static int hsc_tx_set(struct hsi_client *cl, struct hsc_tx_config *txc) { struct hsi_config tmp; int ret; if ((txc->mode != HSI_MODE_STREAM) && (txc->mode != HSI_MODE_FRAME)) return -EINVAL; if ((txc->channels == 0) || (txc->channels > HSC_DEVS)) return -EINVAL; if (txc->channels & (txc->channels - 1)) return -EINVAL; if ((txc->arb_mode != HSI_ARB_RR) && (txc->arb_mode != HSI_ARB_PRIO)) return -EINVAL; tmp = cl->tx_cfg; cl->tx_cfg.mode = txc->mode; cl->tx_cfg.num_hw_channels = txc->channels; cl->tx_cfg.speed = txc->speed; cl->tx_cfg.arb_mode = txc->arb_mode; ret = hsi_setup(cl); if (ret < 0) { cl->tx_cfg = tmp; return ret; } return ret; }

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static inline void hsc_tx_get(struct hsi_client *cl, struct hsc_tx_config *txc) { txc->mode = cl->tx_cfg.mode; txc->channels = cl->tx_cfg.num_hw_channels; txc->speed = cl->tx_cfg.speed; txc->arb_mode = cl->tx_cfg.arb_mode; }

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static ssize_t hsc_read(struct file *file, char __user *buf, size_t len, loff_t *ppos __maybe_unused) { struct hsc_channel *channel = file->private_data; struct hsi_msg *msg; ssize_t ret; if (len == 0) return 0; if (!IS_ALIGNED(len, sizeof(u32))) return -EINVAL; if (len > max_data_size) len = max_data_size; if (channel->ch >= channel->cl->rx_cfg.num_hw_channels) return -ECHRNG; if (test_and_set_bit(HSC_CH_READ, &channel->flags)) return -EBUSY; msg = hsc_get_first_msg(channel, &channel->free_msgs_list); if (!msg) { ret = -ENOSPC; goto out; } hsc_msg_len_set(msg, len); msg->complete = hsc_rx_completed; msg->destructor = hsc_rx_msg_destructor; ret = hsi_async_read(channel->cl, msg); if (ret < 0) { hsc_add_tail(channel, msg, &channel->free_msgs_list); goto out; } ret = wait_event_interruptible(channel->rx_wait, !list_empty(&channel->rx_msgs_queue)); if (ret < 0) { clear_bit(HSC_CH_READ, &channel->flags); hsi_flush(channel->cl); return -EINTR; } msg = hsc_get_first_msg(channel, &channel->rx_msgs_queue); if (msg) { if (msg->status != HSI_STATUS_ERROR) { ret = copy_to_user((void __user *)buf, sg_virt(msg->sgt.sgl), hsc_msg_len_get(msg)); if (ret) ret = -EFAULT; else ret = hsc_msg_len_get(msg); } else { ret = -EIO; } hsc_add_tail(channel, msg, &channel->free_msgs_list); } out: clear_bit(HSC_CH_READ, &channel->flags); return ret; }

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static ssize_t hsc_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos __maybe_unused) { struct hsc_channel *channel = file->private_data; struct hsi_msg *msg; ssize_t ret; if ((len == 0) || !IS_ALIGNED(len, sizeof(u32))) return -EINVAL; if (len > max_data_size) len = max_data_size; if (channel->ch >= channel->cl->tx_cfg.num_hw_channels) return -ECHRNG; if (test_and_set_bit(HSC_CH_WRITE, &channel->flags)) return -EBUSY; msg = hsc_get_first_msg(channel, &channel->free_msgs_list); if (!msg) { clear_bit(HSC_CH_WRITE, &channel->flags); return -ENOSPC; } if (copy_from_user(sg_virt(msg->sgt.sgl), (void __user *)buf, len)) { ret = -EFAULT; goto out; } hsc_msg_len_set(msg, len); msg->complete = hsc_tx_completed; msg->destructor = hsc_tx_msg_destructor; ret = hsi_async_write(channel->cl, msg); if (ret < 0) goto out; ret = wait_event_interruptible(channel->tx_wait, !list_empty(&channel->tx_msgs_queue)); if (ret < 0) { clear_bit(HSC_CH_WRITE, &channel->flags); hsi_flush(channel->cl); return -EINTR; } msg = hsc_get_first_msg(channel, &channel->tx_msgs_queue); if (msg) { if (msg->status == HSI_STATUS_ERROR) ret = -EIO; else ret = hsc_msg_len_get(msg); hsc_add_tail(channel, msg, &channel->free_msgs_list); } out: clear_bit(HSC_CH_WRITE, &channel->flags); return ret; }

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static long hsc_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct hsc_channel *channel = file->private_data; unsigned int state; struct hsc_rx_config rxc; struct hsc_tx_config txc; long ret = 0; switch (cmd) { case HSC_RESET: hsi_flush(channel->cl); break; case HSC_SET_PM: if (copy_from_user(&state, (void __user *)arg, sizeof(state))) return -EFAULT; if (state == HSC_PM_DISABLE) { if (test_and_set_bit(HSC_CH_WLINE, &channel->flags)) return -EINVAL; ret = hsi_start_tx(channel->cl); } else if (state == HSC_PM_ENABLE) { if (!test_and_clear_bit(HSC_CH_WLINE, &channel->flags)) return -EINVAL; ret = hsi_stop_tx(channel->cl); } else { ret = -EINVAL; } break; case HSC_SEND_BREAK: return hsc_break_send(channel->cl); case HSC_SET_RX: if (copy_from_user(&rxc, (void __user *)arg, sizeof(rxc))) return -EFAULT; return hsc_rx_set(channel->cl, &rxc); case HSC_GET_RX: hsc_rx_get(channel->cl, &rxc); if (copy_to_user((void __user *)arg, &rxc, sizeof(rxc))) return -EFAULT; break; case HSC_SET_TX: if (copy_from_user(&txc, (void __user *)arg, sizeof(txc))) return -EFAULT; return hsc_tx_set(channel->cl, &txc); case HSC_GET_TX: hsc_tx_get(channel->cl, &txc); if (copy_to_user((void __user *)arg, &txc, sizeof(txc))) return -EFAULT; break; default: return -ENOIOCTLCMD; } return ret; }

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static inline void __hsc_port_release(struct hsc_client_data *cl_data) { BUG_ON(cl_data->usecnt == 0); if (--cl_data->usecnt == 0) { hsi_flush(cl_data->cl); hsi_release_port(cl_data->cl); } }

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static int hsc_open(struct inode *inode, struct file *file) { struct hsc_client_data *cl_data; struct hsc_channel *channel; int ret = 0; pr_debug("open, minor = %d\n", iminor(inode)); cl_data = container_of(inode->i_cdev, struct hsc_client_data, cdev); mutex_lock(&cl_data->lock); channel = cl_data->channels + (iminor(inode) & HSC_CH_MASK); if (test_and_set_bit(HSC_CH_OPEN, &channel->flags)) { ret = -EBUSY; goto out; } /* * Check if we have already claimed the port associated to the HSI * client. If not then try to claim it, else increase its refcount */ if (cl_data->usecnt == 0) { ret = hsi_claim_port(cl_data->cl, 0); if (ret < 0) goto out; hsi_setup(cl_data->cl); } cl_data->usecnt++; ret = hsc_msgs_alloc(channel); if (ret < 0) { __hsc_port_release(cl_data); goto out; } file->private_data = channel; mutex_unlock(&cl_data->lock); return ret; out: mutex_unlock(&cl_data->lock); return ret; }

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static int hsc_release(struct inode *inode __maybe_unused, struct file *file) { struct hsc_channel *channel = file->private_data; struct hsc_client_data *cl_data = channel->cl_data; mutex_lock(&cl_data->lock); file->private_data = NULL; if (test_and_clear_bit(HSC_CH_WLINE, &channel->flags)) hsi_stop_tx(channel->cl); __hsc_port_release(cl_data); hsc_reset_list(channel, &channel->rx_msgs_queue); hsc_reset_list(channel, &channel->tx_msgs_queue); hsc_reset_list(channel, &channel->free_msgs_list); clear_bit(HSC_CH_READ, &channel->flags); clear_bit(HSC_CH_WRITE, &channel->flags); clear_bit(HSC_CH_OPEN, &channel->flags); wake_up(&channel->rx_wait); wake_up(&channel->tx_wait); mutex_unlock(&cl_data->lock); return 0; }

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static const struct file_operations hsc_fops = { .owner = THIS_MODULE, .read = hsc_read, .write = hsc_write, .unlocked_ioctl = hsc_ioctl, .open = hsc_open, .release = hsc_release, };
static void hsc_channel_init(struct hsc_channel *channel) { init_waitqueue_head(&channel->rx_wait); init_waitqueue_head(&channel->tx_wait); spin_lock_init(&channel->lock); INIT_LIST_HEAD(&channel->free_msgs_list); INIT_LIST_HEAD(&channel->rx_msgs_queue); INIT_LIST_HEAD(&channel->tx_msgs_queue); }

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static int hsc_probe(struct device *dev) { const char devname[] = "hsi_char"; struct hsc_client_data *cl_data; struct hsc_channel *channel; struct hsi_client *cl = to_hsi_client(dev); unsigned int hsc_baseminor; dev_t hsc_dev; int ret; int i; cl_data = kzalloc(sizeof(*cl_data), GFP_KERNEL); if (!cl_data) { dev_err(dev, "Could not allocate hsc_client_data\n"); return -ENOMEM; } hsc_baseminor = HSC_BASEMINOR(hsi_id(cl), hsi_port_id(cl)); if (!hsc_major) { ret = alloc_chrdev_region(&hsc_dev, hsc_baseminor, HSC_DEVS, devname); if (ret == 0) hsc_major = MAJOR(hsc_dev); } else { hsc_dev = MKDEV(hsc_major, hsc_baseminor); ret = register_chrdev_region(hsc_dev, HSC_DEVS, devname); } if (ret < 0) { dev_err(dev, "Device %s allocation failed %d\n", hsc_major ? "minor" : "major", ret); goto out1; } mutex_init(&cl_data->lock); hsi_client_set_drvdata(cl, cl_data); cdev_init(&cl_data->cdev, &hsc_fops); cl_data->cdev.owner = THIS_MODULE; cl_data->cl = cl; for (i = 0, channel = cl_data->channels; i < HSC_DEVS; i++, channel++) { hsc_channel_init(channel); channel->ch = i; channel->cl = cl; channel->cl_data = cl_data; } /* 1 hsi client -> N char devices (one for each channel) */ ret = cdev_add(&cl_data->cdev, hsc_dev, HSC_DEVS); if (ret) { dev_err(dev, "Could not add char device %d\n", ret); goto out2; } return 0; out2: unregister_chrdev_region(hsc_dev, HSC_DEVS); out1: kfree(cl_data); return ret; }

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Sebastian Reichel10.31%150.00%
Total322100.00%2100.00%


static int hsc_remove(struct device *dev) { struct hsi_client *cl = to_hsi_client(dev); struct hsc_client_data *cl_data = hsi_client_drvdata(cl); dev_t hsc_dev = cl_data->cdev.dev; cdev_del(&cl_data->cdev); unregister_chrdev_region(hsc_dev, HSC_DEVS); hsi_client_set_drvdata(cl, NULL); kfree(cl_data); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Andras Domokos70100.00%1100.00%
Total70100.00%1100.00%

static struct hsi_client_driver hsc_driver = { .driver = { .name = "hsi_char", .owner = THIS_MODULE, .probe = hsc_probe, .remove = hsc_remove, }, };
static int __init hsc_init(void) { int ret; if ((max_data_size < 4) || (max_data_size > 0x10000) || (max_data_size & (max_data_size - 1))) { pr_err("Invalid max read/write data size"); return -EINVAL; } ret = hsi_register_client_driver(&hsc_driver); if (ret) { pr_err("Error while registering HSI/SSI driver %d", ret); return ret; } pr_info("HSI/SSI char device loaded\n"); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Andras Domokos79100.00%1100.00%
Total79100.00%1100.00%

module_init(hsc_init);
static void __exit hsc_exit(void) { hsi_unregister_client_driver(&hsc_driver); pr_info("HSI char device removed\n"); }

Contributors

PersonTokensPropCommitsCommitProp
Andras Domokos20100.00%1100.00%
Total20100.00%1100.00%

module_exit(hsc_exit); MODULE_AUTHOR("Andras Domokos <andras.domokos@nokia.com>"); MODULE_ALIAS("hsi:hsi_char"); MODULE_DESCRIPTION("HSI character device"); MODULE_LICENSE("GPL v2");

Overall Contributors

PersonTokensPropCommitsCommitProp
Andras Domokos387999.79%125.00%
Sebastian Reichel70.18%250.00%
Carlos Chinea10.03%125.00%
Total3887100.00%4100.00%
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