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OpenCloudOS-Kernel/drivers/net/caif/caif_spi.c

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/*
* Copyright (C) ST-Ericsson AB 2010
* Contact: Sjur Brendeland / sjur.brandeland@stericsson.com
* Author: Daniel Martensson / Daniel.Martensson@stericsson.com
* License terms: GNU General Public License (GPL) version 2.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/workqueue.h>
#include <linux/completion.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/debugfs.h>
#include <linux/if_arp.h>
#include <net/caif/caif_layer.h>
#include <net/caif/caif_spi.h>
#ifndef CONFIG_CAIF_SPI_SYNC
#define FLAVOR "Flavour: Vanilla.\n"
#else
#define FLAVOR "Flavour: Master CMD&LEN at start.\n"
#endif /* CONFIG_CAIF_SPI_SYNC */
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Martensson<daniel.martensson@stericsson.com>");
MODULE_DESCRIPTION("CAIF SPI driver");
/* Returns the number of padding bytes for alignment. */
#define PAD_POW2(x, pow) ((((x)&((pow)-1))==0) ? 0 : (((pow)-((x)&((pow)-1)))))
static int spi_loop;
module_param(spi_loop, bool, S_IRUGO);
MODULE_PARM_DESC(spi_loop, "SPI running in loopback mode.");
/* SPI frame alignment. */
module_param(spi_frm_align, int, S_IRUGO);
MODULE_PARM_DESC(spi_frm_align, "SPI frame alignment.");
/*
* SPI padding options.
* Warning: must be a base of 2 (& operation used) and can not be zero !
*/
module_param(spi_up_head_align, int, S_IRUGO);
MODULE_PARM_DESC(spi_up_head_align, "SPI uplink head alignment.");
module_param(spi_up_tail_align, int, S_IRUGO);
MODULE_PARM_DESC(spi_up_tail_align, "SPI uplink tail alignment.");
module_param(spi_down_head_align, int, S_IRUGO);
MODULE_PARM_DESC(spi_down_head_align, "SPI downlink head alignment.");
module_param(spi_down_tail_align, int, S_IRUGO);
MODULE_PARM_DESC(spi_down_tail_align, "SPI downlink tail alignment.");
#ifdef CONFIG_ARM
#define BYTE_HEX_FMT "%02X"
#else
#define BYTE_HEX_FMT "%02hhX"
#endif
#define SPI_MAX_PAYLOAD_SIZE 4096
/*
* Threshold values for the SPI packet queue. Flowcontrol will be asserted
* when the number of packets exceeds HIGH_WATER_MARK. It will not be
* deasserted before the number of packets drops below LOW_WATER_MARK.
*/
#define LOW_WATER_MARK 100
#define HIGH_WATER_MARK (LOW_WATER_MARK*5)
#ifdef CONFIG_UML
/*
* We sometimes use UML for debugging, but it cannot handle
* dma_alloc_coherent so we have to wrap it.
*/
static inline void *dma_alloc(dma_addr_t *daddr)
{
return kmalloc(SPI_DMA_BUF_LEN, GFP_KERNEL);
}
static inline void dma_free(void *cpu_addr, dma_addr_t handle)
{
kfree(cpu_addr);
}
#else
static inline void *dma_alloc(dma_addr_t *daddr)
{
return dma_alloc_coherent(NULL, SPI_DMA_BUF_LEN, daddr,
GFP_KERNEL);
}
static inline void dma_free(void *cpu_addr, dma_addr_t handle)
{
dma_free_coherent(NULL, SPI_DMA_BUF_LEN, cpu_addr, handle);
}
#endif /* CONFIG_UML */
#ifdef CONFIG_DEBUG_FS
#define DEBUGFS_BUF_SIZE 4096
static struct dentry *dbgfs_root;
static inline void driver_debugfs_create(void)
{
dbgfs_root = debugfs_create_dir(cfspi_spi_driver.driver.name, NULL);
}
static inline void driver_debugfs_remove(void)
{
debugfs_remove(dbgfs_root);
}
static inline void dev_debugfs_rem(struct cfspi *cfspi)
{
debugfs_remove(cfspi->dbgfs_frame);
debugfs_remove(cfspi->dbgfs_state);
debugfs_remove(cfspi->dbgfs_dir);
}
static int dbgfs_open(struct inode *inode, struct file *file)
{
file->private_data = inode->i_private;
return 0;
}
static ssize_t dbgfs_state(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
char *buf;
int len = 0;
ssize_t size;
struct cfspi *cfspi = file->private_data;
buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL);
if (!buf)
return 0;
/* Print out debug information. */
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"CAIF SPI debug information:\n");
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), FLAVOR);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"STATE: %d\n", cfspi->dbg_state);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Previous CMD: 0x%x\n", cfspi->pcmd);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Current CMD: 0x%x\n", cfspi->cmd);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Previous TX len: %d\n", cfspi->tx_ppck_len);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Previous RX len: %d\n", cfspi->rx_ppck_len);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Current TX len: %d\n", cfspi->tx_cpck_len);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Current RX len: %d\n", cfspi->rx_cpck_len);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Next TX len: %d\n", cfspi->tx_npck_len);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Next RX len: %d\n", cfspi->rx_npck_len);
if (len > DEBUGFS_BUF_SIZE)
len = DEBUGFS_BUF_SIZE;
size = simple_read_from_buffer(user_buf, count, ppos, buf, len);
kfree(buf);
return size;
}
static ssize_t print_frame(char *buf, size_t size, char *frm,
size_t count, size_t cut)
{
int len = 0;
int i;
for (i = 0; i < count; i++) {
len += snprintf((buf + len), (size - len),
"[0x" BYTE_HEX_FMT "]",
frm[i]);
if ((i == cut) && (count > (cut * 2))) {
/* Fast forward. */
i = count - cut;
len += snprintf((buf + len), (size - len),
"--- %u bytes skipped ---\n",
(int)(count - (cut * 2)));
}
if ((!(i % 10)) && i) {
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"\n");
}
}
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len), "\n");
return len;
}
static ssize_t dbgfs_frame(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
char *buf;
int len = 0;
ssize_t size;
struct cfspi *cfspi;
cfspi = file->private_data;
buf = kzalloc(DEBUGFS_BUF_SIZE, GFP_KERNEL);
if (!buf)
return 0;
/* Print out debug information. */
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Current frame:\n");
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Tx data (Len: %d):\n", cfspi->tx_cpck_len);
len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len),
cfspi->xfer.va_tx,
(cfspi->tx_cpck_len + SPI_CMD_SZ), 100);
len += snprintf((buf + len), (DEBUGFS_BUF_SIZE - len),
"Rx data (Len: %d):\n", cfspi->rx_cpck_len);
len += print_frame((buf + len), (DEBUGFS_BUF_SIZE - len),
cfspi->xfer.va_rx,
(cfspi->rx_cpck_len + SPI_CMD_SZ), 100);
size = simple_read_from_buffer(user_buf, count, ppos, buf, len);
kfree(buf);
return size;
}
static const struct file_operations dbgfs_state_fops = {
.open = dbgfs_open,
.read = dbgfs_state,
.owner = THIS_MODULE
};
static const struct file_operations dbgfs_frame_fops = {
.open = dbgfs_open,
.read = dbgfs_frame,
.owner = THIS_MODULE
};
static inline void dev_debugfs_add(struct cfspi *cfspi)
{
cfspi->dbgfs_dir = debugfs_create_dir(cfspi->pdev->name, dbgfs_root);
cfspi->dbgfs_state = debugfs_create_file("state", S_IRUGO,
cfspi->dbgfs_dir, cfspi,
&dbgfs_state_fops);
cfspi->dbgfs_frame = debugfs_create_file("frame", S_IRUGO,
cfspi->dbgfs_dir, cfspi,
&dbgfs_frame_fops);
}
inline void cfspi_dbg_state(struct cfspi *cfspi, int state)
{
cfspi->dbg_state = state;
};
#else
static inline void driver_debugfs_create(void)
{
}
static inline void driver_debugfs_remove(void)
{
}
static inline void dev_debugfs_add(struct cfspi *cfspi)
{
}
static inline void dev_debugfs_rem(struct cfspi *cfspi)
{
}
inline void cfspi_dbg_state(struct cfspi *cfspi, int state)
{
}
#endif /* CONFIG_DEBUG_FS */
static LIST_HEAD(cfspi_list);
static spinlock_t cfspi_list_lock;
/* SPI uplink head alignment. */
static ssize_t show_up_head_align(struct device_driver *driver, char *buf)
{
return sprintf(buf, "%d\n", spi_up_head_align);
}
static DRIVER_ATTR(up_head_align, S_IRUSR, show_up_head_align, NULL);
/* SPI uplink tail alignment. */
static ssize_t show_up_tail_align(struct device_driver *driver, char *buf)
{
return sprintf(buf, "%d\n", spi_up_tail_align);
}
static DRIVER_ATTR(up_tail_align, S_IRUSR, show_up_tail_align, NULL);
/* SPI downlink head alignment. */
static ssize_t show_down_head_align(struct device_driver *driver, char *buf)
{
return sprintf(buf, "%d\n", spi_down_head_align);
}
static DRIVER_ATTR(down_head_align, S_IRUSR, show_down_head_align, NULL);
/* SPI downlink tail alignment. */
static ssize_t show_down_tail_align(struct device_driver *driver, char *buf)
{
return sprintf(buf, "%d\n", spi_down_tail_align);
}
static DRIVER_ATTR(down_tail_align, S_IRUSR, show_down_tail_align, NULL);
/* SPI frame alignment. */
static ssize_t show_frame_align(struct device_driver *driver, char *buf)
{
return sprintf(buf, "%d\n", spi_frm_align);
}
static DRIVER_ATTR(frame_align, S_IRUSR, show_frame_align, NULL);
int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len)
{
u8 *dst = buf;
caif_assert(buf);
if (cfspi->slave && !cfspi->slave_talked)
cfspi->slave_talked = true;
do {
struct sk_buff *skb;
struct caif_payload_info *info;
int spad = 0;
int epad;
skb = skb_dequeue(&cfspi->chead);
if (!skb)
break;
/*
* Calculate length of frame including SPI padding.
* The payload position is found in the control buffer.
*/
info = (struct caif_payload_info *)&skb->cb;
/*
* Compute head offset i.e. number of bytes to add to
* get the start of the payload aligned.
*/
if (spi_up_head_align > 1) {
spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align);
*dst = (u8)(spad - 1);
dst += spad;
}
/* Copy in CAIF frame. */
skb_copy_bits(skb, 0, dst, skb->len);
dst += skb->len;
cfspi->ndev->stats.tx_packets++;
cfspi->ndev->stats.tx_bytes += skb->len;
/*
* Compute tail offset i.e. number of bytes to add to
* get the complete CAIF frame aligned.
*/
epad = PAD_POW2((skb->len + spad), spi_up_tail_align);
dst += epad;
dev_kfree_skb(skb);
} while ((dst - buf) < len);
return dst - buf;
}
int cfspi_xmitlen(struct cfspi *cfspi)
{
struct sk_buff *skb = NULL;
int frm_len = 0;
int pkts = 0;
/*
* Decommit previously committed frames.
* skb_queue_splice_tail(&cfspi->chead,&cfspi->qhead)
*/
while (skb_peek(&cfspi->chead)) {
skb = skb_dequeue_tail(&cfspi->chead);
skb_queue_head(&cfspi->qhead, skb);
}
do {
struct caif_payload_info *info = NULL;
int spad = 0;
int epad = 0;
skb = skb_dequeue(&cfspi->qhead);
if (!skb)
break;
/*
* Calculate length of frame including SPI padding.
* The payload position is found in the control buffer.
*/
info = (struct caif_payload_info *)&skb->cb;
/*
* Compute head offset i.e. number of bytes to add to
* get the start of the payload aligned.
*/
if (spi_up_head_align > 1)
spad = 1 + PAD_POW2((info->hdr_len + 1), spi_up_head_align);
/*
* Compute tail offset i.e. number of bytes to add to
* get the complete CAIF frame aligned.
*/
epad = PAD_POW2((skb->len + spad), spi_up_tail_align);
if ((skb->len + spad + epad + frm_len) <= CAIF_MAX_SPI_FRAME) {
skb_queue_tail(&cfspi->chead, skb);
pkts++;
frm_len += skb->len + spad + epad;
} else {
/* Put back packet. */
skb_queue_head(&cfspi->qhead, skb);
break;
}
} while (pkts <= CAIF_MAX_SPI_PKTS);
/*
* Send flow on if previously sent flow off
* and now go below the low water mark
*/
if (cfspi->flow_off_sent && cfspi->qhead.qlen < cfspi->qd_low_mark &&
cfspi->cfdev.flowctrl) {
cfspi->flow_off_sent = 0;
cfspi->cfdev.flowctrl(cfspi->ndev, 1);
}
return frm_len;
}
static void cfspi_ss_cb(bool assert, struct cfspi_ifc *ifc)
{
struct cfspi *cfspi = (struct cfspi *)ifc->priv;
/*
* The slave device is the master on the link. Interrupts before the
* slave has transmitted are considered spurious.
*/
if (cfspi->slave && !cfspi->slave_talked) {
printk(KERN_WARNING "CFSPI: Spurious SS interrupt.\n");
return;
}
if (!in_interrupt())
spin_lock(&cfspi->lock);
if (assert) {
set_bit(SPI_SS_ON, &cfspi->state);
set_bit(SPI_XFER, &cfspi->state);
} else {
set_bit(SPI_SS_OFF, &cfspi->state);
}
if (!in_interrupt())
spin_unlock(&cfspi->lock);
/* Wake up the xfer thread. */
if (assert)
wake_up_interruptible(&cfspi->wait);
}
static void cfspi_xfer_done_cb(struct cfspi_ifc *ifc)
{
struct cfspi *cfspi = (struct cfspi *)ifc->priv;
/* Transfer done, complete work queue */
complete(&cfspi->comp);
}
static int cfspi_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct cfspi *cfspi = NULL;
unsigned long flags;
if (!dev)
return -EINVAL;
cfspi = netdev_priv(dev);
skb_queue_tail(&cfspi->qhead, skb);
spin_lock_irqsave(&cfspi->lock, flags);
if (!test_and_set_bit(SPI_XFER, &cfspi->state)) {
/* Wake up xfer thread. */
wake_up_interruptible(&cfspi->wait);
}
spin_unlock_irqrestore(&cfspi->lock, flags);
/* Send flow off if number of bytes is above high water mark */
if (!cfspi->flow_off_sent &&
cfspi->qhead.qlen > cfspi->qd_high_mark &&
cfspi->cfdev.flowctrl) {
cfspi->flow_off_sent = 1;
cfspi->cfdev.flowctrl(cfspi->ndev, 0);
}
return 0;
}
int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len)
{
u8 *src = buf;
caif_assert(buf != NULL);
do {
int res;
struct sk_buff *skb = NULL;
int spad = 0;
int epad = 0;
u8 *dst = NULL;
int pkt_len = 0;
/*
* Compute head offset i.e. number of bytes added to
* get the start of the payload aligned.
*/
if (spi_down_head_align > 1) {
spad = 1 + *src;
src += spad;
}
/* Read length of CAIF frame (little endian). */
pkt_len = *src;
pkt_len |= ((*(src+1)) << 8) & 0xFF00;
pkt_len += 2; /* Add FCS fields. */
/* Get a suitable caif packet and copy in data. */
skb = netdev_alloc_skb(cfspi->ndev, pkt_len + 1);
caif_assert(skb != NULL);
dst = skb_put(skb, pkt_len);
memcpy(dst, src, pkt_len);
src += pkt_len;
skb->protocol = htons(ETH_P_CAIF);
skb_reset_mac_header(skb);
skb->dev = cfspi->ndev;
/*
* Push received packet up the stack.
*/
if (!spi_loop)
res = netif_rx_ni(skb);
else
res = cfspi_xmit(skb, cfspi->ndev);
if (!res) {
cfspi->ndev->stats.rx_packets++;
cfspi->ndev->stats.rx_bytes += pkt_len;
} else
cfspi->ndev->stats.rx_dropped++;
/*
* Compute tail offset i.e. number of bytes added to
* get the complete CAIF frame aligned.
*/
epad = PAD_POW2((pkt_len + spad), spi_down_tail_align);
src += epad;
} while ((src - buf) < len);
return src - buf;
}
static int cfspi_open(struct net_device *dev)
{
netif_wake_queue(dev);
return 0;
}
static int cfspi_close(struct net_device *dev)
{
netif_stop_queue(dev);
return 0;
}
static const struct net_device_ops cfspi_ops = {
.ndo_open = cfspi_open,
.ndo_stop = cfspi_close,
.ndo_start_xmit = cfspi_xmit
};
static void cfspi_setup(struct net_device *dev)
{
struct cfspi *cfspi = netdev_priv(dev);
dev->features = 0;
dev->netdev_ops = &cfspi_ops;
dev->type = ARPHRD_CAIF;
dev->flags = IFF_NOARP | IFF_POINTOPOINT;
dev->tx_queue_len = 0;
dev->mtu = SPI_MAX_PAYLOAD_SIZE;
dev->destructor = free_netdev;
skb_queue_head_init(&cfspi->qhead);
skb_queue_head_init(&cfspi->chead);
cfspi->cfdev.link_select = CAIF_LINK_HIGH_BANDW;
cfspi->cfdev.use_frag = false;
cfspi->cfdev.use_stx = false;
cfspi->cfdev.use_fcs = false;
cfspi->ndev = dev;
}
int cfspi_spi_probe(struct platform_device *pdev)
{
struct cfspi *cfspi = NULL;
struct net_device *ndev;
struct cfspi_dev *dev;
int res;
dev = (struct cfspi_dev *)pdev->dev.platform_data;
ndev = alloc_netdev(sizeof(struct cfspi),
"cfspi%d", cfspi_setup);
if (!ndev)
return -ENOMEM;
cfspi = netdev_priv(ndev);
netif_stop_queue(ndev);
cfspi->ndev = ndev;
cfspi->pdev = pdev;
/* Set flow info. */
cfspi->flow_off_sent = 0;
cfspi->qd_low_mark = LOW_WATER_MARK;
cfspi->qd_high_mark = HIGH_WATER_MARK;
/* Set slave info. */
if (!strncmp(cfspi_spi_driver.driver.name, "cfspi_sspi", 10)) {
cfspi->slave = true;
cfspi->slave_talked = false;
} else {
cfspi->slave = false;
cfspi->slave_talked = false;
}
/* Assign the SPI device. */
cfspi->dev = dev;
/* Assign the device ifc to this SPI interface. */
dev->ifc = &cfspi->ifc;
/* Allocate DMA buffers. */
cfspi->xfer.va_tx = dma_alloc(&cfspi->xfer.pa_tx);
if (!cfspi->xfer.va_tx) {
res = -ENODEV;
goto err_dma_alloc_tx;
}
cfspi->xfer.va_rx = dma_alloc(&cfspi->xfer.pa_rx);
if (!cfspi->xfer.va_rx) {
res = -ENODEV;
goto err_dma_alloc_rx;
}
/* Initialize the work queue. */
INIT_WORK(&cfspi->work, cfspi_xfer);
/* Initialize spin locks. */
spin_lock_init(&cfspi->lock);
/* Initialize flow control state. */
cfspi->flow_stop = false;
/* Initialize wait queue. */
init_waitqueue_head(&cfspi->wait);
/* Create work thread. */
cfspi->wq = create_singlethread_workqueue(dev->name);
if (!cfspi->wq) {
printk(KERN_WARNING "CFSPI: failed to create work queue.\n");
res = -ENODEV;
goto err_create_wq;
}
/* Initialize work queue. */
init_completion(&cfspi->comp);
/* Create debugfs entries. */
dev_debugfs_add(cfspi);
/* Set up the ifc. */
cfspi->ifc.ss_cb = cfspi_ss_cb;
cfspi->ifc.xfer_done_cb = cfspi_xfer_done_cb;
cfspi->ifc.priv = cfspi;
/* Add CAIF SPI device to list. */
spin_lock(&cfspi_list_lock);
list_add_tail(&cfspi->list, &cfspi_list);
spin_unlock(&cfspi_list_lock);
/* Schedule the work queue. */
queue_work(cfspi->wq, &cfspi->work);
/* Register network device. */
res = register_netdev(ndev);
if (res) {
printk(KERN_ERR "CFSPI: Reg. error: %d.\n", res);
goto err_net_reg;
}
return res;
err_net_reg:
dev_debugfs_rem(cfspi);
set_bit(SPI_TERMINATE, &cfspi->state);
wake_up_interruptible(&cfspi->wait);
destroy_workqueue(cfspi->wq);
err_create_wq:
dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx);
err_dma_alloc_rx:
dma_free(cfspi->xfer.va_tx, cfspi->xfer.pa_tx);
err_dma_alloc_tx:
free_netdev(ndev);
return res;
}
int cfspi_spi_remove(struct platform_device *pdev)
{
struct list_head *list_node;
struct list_head *n;
struct cfspi *cfspi = NULL;
struct cfspi_dev *dev;
dev = (struct cfspi_dev *)pdev->dev.platform_data;
spin_lock(&cfspi_list_lock);
list_for_each_safe(list_node, n, &cfspi_list) {
cfspi = list_entry(list_node, struct cfspi, list);
/* Find the corresponding device. */
if (cfspi->dev == dev) {
/* Remove from list. */
list_del(list_node);
/* Free DMA buffers. */
dma_free(cfspi->xfer.va_rx, cfspi->xfer.pa_rx);
dma_free(cfspi->xfer.va_tx, cfspi->xfer.pa_tx);
set_bit(SPI_TERMINATE, &cfspi->state);
wake_up_interruptible(&cfspi->wait);
destroy_workqueue(cfspi->wq);
/* Destroy debugfs directory and files. */
dev_debugfs_rem(cfspi);
unregister_netdev(cfspi->ndev);
spin_unlock(&cfspi_list_lock);
return 0;
}
}
spin_unlock(&cfspi_list_lock);
return -ENODEV;
}
static void __exit cfspi_exit_module(void)
{
struct list_head *list_node;
struct list_head *n;
struct cfspi *cfspi = NULL;
list_for_each_safe(list_node, n, &cfspi_list) {
cfspi = list_entry(list_node, struct cfspi, list);
platform_device_unregister(cfspi->pdev);
}
/* Destroy sysfs files. */
driver_remove_file(&cfspi_spi_driver.driver,
&driver_attr_up_head_align);
driver_remove_file(&cfspi_spi_driver.driver,
&driver_attr_up_tail_align);
driver_remove_file(&cfspi_spi_driver.driver,
&driver_attr_down_head_align);
driver_remove_file(&cfspi_spi_driver.driver,
&driver_attr_down_tail_align);
driver_remove_file(&cfspi_spi_driver.driver, &driver_attr_frame_align);
/* Unregister platform driver. */
platform_driver_unregister(&cfspi_spi_driver);
/* Destroy debugfs root directory. */
driver_debugfs_remove();
}
static int __init cfspi_init_module(void)
{
int result;
/* Initialize spin lock. */
spin_lock_init(&cfspi_list_lock);
/* Register platform driver. */
result = platform_driver_register(&cfspi_spi_driver);
if (result) {
printk(KERN_ERR "Could not register platform SPI driver.\n");
goto err_dev_register;
}
/* Create sysfs files. */
result =
driver_create_file(&cfspi_spi_driver.driver,
&driver_attr_up_head_align);
if (result) {
printk(KERN_ERR "Sysfs creation failed 1.\n");
goto err_create_up_head_align;
}
result =
driver_create_file(&cfspi_spi_driver.driver,
&driver_attr_up_tail_align);
if (result) {
printk(KERN_ERR "Sysfs creation failed 2.\n");
goto err_create_up_tail_align;
}
result =
driver_create_file(&cfspi_spi_driver.driver,
&driver_attr_down_head_align);
if (result) {
printk(KERN_ERR "Sysfs creation failed 3.\n");
goto err_create_down_head_align;
}
result =
driver_create_file(&cfspi_spi_driver.driver,
&driver_attr_down_tail_align);
if (result) {
printk(KERN_ERR "Sysfs creation failed 4.\n");
goto err_create_down_tail_align;
}
result =
driver_create_file(&cfspi_spi_driver.driver,
&driver_attr_frame_align);
if (result) {
printk(KERN_ERR "Sysfs creation failed 5.\n");
goto err_create_frame_align;
}
driver_debugfs_create();
return result;
err_create_frame_align:
driver_remove_file(&cfspi_spi_driver.driver,
&driver_attr_down_tail_align);
err_create_down_tail_align:
driver_remove_file(&cfspi_spi_driver.driver,
&driver_attr_down_head_align);
err_create_down_head_align:
driver_remove_file(&cfspi_spi_driver.driver,
&driver_attr_up_tail_align);
err_create_up_tail_align:
driver_remove_file(&cfspi_spi_driver.driver,
&driver_attr_up_head_align);
err_create_up_head_align:
err_dev_register:
return result;
}
module_init(cfspi_init_module);
module_exit(cfspi_exit_module);
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