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提交 7d0f940e 编写于 作者: H H Hartley Sweeten 提交者： Greg Kroah-Hartman
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Staging: dt3155_drv.c: dereference dt3155_status[] 

Where used, dereference the global symbol dt3155_status[] as a local
pointer.  This improves the readability of the code and reduces the
overall length of some of the really long lines.
Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Scott Smedley <ss@aao.gov.au>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
上级 4d8152be
隐藏空白更改
内联 并排
Showing with 94 addition and 86 deletion
drivers/staging/dt3155/dt3155_drv.c
浏览文件 @ 7d0f940e
......@@ -135,7 +135,8 @@ u32 unique_tag = 0;;
*/
static void quick_stop (int minor)
{
struct dt3155_fbuffer *fb = &dt3155_status[minor].fbuffer;
struct dt3155_status *dts = &dt3155_status[minor];
struct dt3155_fbuffer *fb = &dts->fbuffer;
// TODO: scott was here
#if 1
......@@ -145,13 +146,13 @@ static void quick_stop (int minor)
int_csr_r.fld.FLD_END_ODD_EN = 0;
writel(int_csr_r.reg, dt3155_lbase[minor] + INT_CSR);
dt3155_status[minor].state &= ~(DT3155_STATE_STOP|0xff);
dts->state &= ~(DT3155_STATE_STOP|0xff);
/* mark the system stopped: */
dt3155_status[minor].state |= DT3155_STATE_IDLE;
dts->state |= DT3155_STATE_IDLE;
fb->stop_acquire = 0;
fb->even_stopped = 0;
#else
dt3155_status[minor].state |= DT3155_STATE_STOP;
dts->state |= DT3155_STATE_STOP;
fb->stop_acquire = 1;
#endif
......@@ -172,6 +173,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
unsigned long flags;
u32 buffer_addr;
void __iomem *mmio;
struct dt3155_status *dts;
struct dt3155_fbuffer *fb;
/* find out who issued the interrupt */
......@@ -190,7 +192,8 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
}
mmio = dt3155_lbase[minor];
fb = &dt3155_status[minor].fbuffer;
dts = &dt3155_status[minor];
fb = &dts->fbuffer;
/* Check for corruption and set a flag if so */
csr1_r.reg = readl(mmio + CSR1);
......@@ -210,8 +213,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* Handle the even field ... */
if (int_csr_r.fld.FLD_END_EVE)
{
if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
if ((dts->state & DT3155_STATE_MODE) == DT3155_STATE_FLD)
{
fb->frame_count++;
}
......@@ -239,12 +241,11 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
writel(int_csr_r.reg, mmio + INT_CSR);
/* Set up next DMA if we are doing FIELDS */
if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
if ((dts->state & DT3155_STATE_MODE) == DT3155_STATE_FLD)
{
/* GCS (Aug 2, 2002) -- In field mode, dma the odd field
into the lower half of the buffer */
const u32 stride = dt3155_status[minor].config.cols;
const u32 stride = dts->config.cols;
buffer_addr = fb->frame_info[fb->active_buf].addr +
(DT3155_MAX_ROWS / 2) * stride;
local_save_flags(flags);
......@@ -282,8 +283,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
int_csr_r.fld.FLD_END_ODD = 1;
if (fb->even_happened ||
(dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
(dts->state & DT3155_STATE_MODE) == DT3155_STATE_FLD)
{
fb->frame_count++;
}
......@@ -295,15 +295,14 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
{
/* disable interrupts */
int_csr_r.fld.FLD_END_ODD_EN = 0;
dt3155_status[minor].state &= ~(DT3155_STATE_STOP|0xff);
dts->state &= ~(DT3155_STATE_STOP|0xff);
/* mark the system stopped: */
dt3155_status[minor].state |= DT3155_STATE_IDLE;
dts->state |= DT3155_STATE_IDLE;
fb->stop_acquire = 0;
fb->even_stopped = 0;
printk(KERN_DEBUG "dt3155: state is now %x\n",
dt3155_status[minor].state);
printk(KERN_DEBUG "dt3155: state is now %x\n", dts->state);
}
else
{
......@@ -317,8 +316,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* change the next dma location for both fields */
/* and wake up the process if sleeping */
if (fb->even_happened ||
(dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
(dts->state & DT3155_STATE_MODE) == DT3155_STATE_FLD)
{
local_save_flags(flags);
......@@ -379,8 +377,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* Set up the DMA address for the next frame/field */
buffer_addr = fb->frame_info[fb->active_buf].addr;
if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
if ((dts->state & DT3155_STATE_MODE) == DT3155_STATE_FLD)
{
writel(buffer_addr, mmio + EVEN_DMA_START);
}
......@@ -388,8 +385,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
{
writel(buffer_addr, mmio + EVEN_DMA_START);
writel(buffer_addr + dt3155_status[minor].config.cols,
mmio + ODD_DMA_START);
writel(buffer_addr + dts->config.cols, mmio + ODD_DMA_START);
}
/* Do error checking */
......@@ -413,11 +409,12 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
*****************************************************/
static void dt3155_init_isr(int minor)
{
const u32 stride = dt3155_status[minor].config.cols;
struct dt3155_status *dts = &dt3155_status[minor];
struct dt3155_fbuffer *fb = &dts->fbuffer;
const u32 stride = dts->config.cols;
void __iomem *mmio = dt3155_lbase[minor];
struct dt3155_fbuffer *fb = &dt3155_status[minor].fbuffer;
switch (dt3155_status[minor].state & DT3155_STATE_MODE)
switch (dts->state & DT3155_STATE_MODE)
{
case DT3155_STATE_FLD:
{
......@@ -507,7 +504,8 @@ static int dt3155_ioctl(struct inode *inode,
{
int minor = MINOR(inode->i_rdev); /* What device are we ioctl()'ing? */
void __user *up = (void __user *)arg;
struct dt3155_fbuffer *fb = &dt3155_status[minor].fbuffer;
struct dt3155_status *dts = &dt3155_status[minor];
struct dt3155_fbuffer *fb = &dts->fbuffer;
if (minor >= MAXBOARDS || minor < 0)
return -ENODEV;
......@@ -529,7 +527,7 @@ static int dt3155_ioctl(struct inode *inode,
{
case DT3155_SET_CONFIG:
{
if (dt3155_status[minor].state != DT3155_STATE_IDLE)
if (dts->state != DT3155_STATE_IDLE)
return -EBUSY;
{
......@@ -546,59 +544,55 @@ static int dt3155_ioctl(struct inode *inode,
{
return -EINVAL;
}
dt3155_status[minor].config = tmp;
dts->config = tmp;
}
return 0;
}
case DT3155_GET_CONFIG:
{
if (copy_to_user(up, &dt3155_status[minor],
sizeof(struct dt3155_status)))
if (copy_to_user(up, dts, sizeof(*dts)))
return -EFAULT;
return 0;
}
case DT3155_FLUSH: /* Flushes the buffers -- ensures fresh data */
{
if (dt3155_status[minor].state != DT3155_STATE_IDLE)
if (dts->state != DT3155_STATE_IDLE)
return -EBUSY;
return dt3155_flush(minor);
}
case DT3155_STOP:
{
if (dt3155_status[minor].state & DT3155_STATE_STOP ||
fb->stop_acquire)
if (dts->state & DT3155_STATE_STOP || fb->stop_acquire)
return -EBUSY;
if (dt3155_status[minor].state == DT3155_STATE_IDLE)
if (dts->state == DT3155_STATE_IDLE)
return 0;
quick_stop(minor);
if (copy_to_user(up, &dt3155_status[minor],
sizeof(struct dt3155_status)))
if (copy_to_user(up, dts, sizeof(*dts)))
return -EFAULT;
return 0;
}
case DT3155_START:
{
if (dt3155_status[minor].state != DT3155_STATE_IDLE)
if (dts->state != DT3155_STATE_IDLE)
return -EBUSY;
fb->stop_acquire = 0;
fb->frame_count = 0;
/* Set the MODE in the status -- we default to FRAME */
if (dt3155_status[minor].config.acq_mode == DT3155_MODE_FIELD)
if (dts->config.acq_mode == DT3155_MODE_FIELD)
{
dt3155_status[minor].state = DT3155_STATE_FLD;
dts->state = DT3155_STATE_FLD;
}
else
{
dt3155_status[minor].state = DT3155_STATE_FRAME;
dts->state = DT3155_STATE_FRAME;
}
dt3155_init_isr(minor);
if (copy_to_user(up, &dt3155_status[minor],
sizeof(struct dt3155_status)))
if (copy_to_user(up, dts, sizeof(*dts)))
return -EFAULT;
return 0;
}
......@@ -627,7 +621,8 @@ static int dt3155_ioctl(struct inode *inode,
static int dt3155_mmap (struct file * file, struct vm_area_struct * vma)
{
/* which device are we mmapping? */
int minor = MINOR(file->f_dentry->d_inode->i_rdev);
int minor = MINOR(file->f_dentry->d_inode->i_rdev);
struct dt3155_status *dts = &dt3155_status[minor];
unsigned long offset;
offset = vma->vm_pgoff << PAGE_SHIFT;
......@@ -638,10 +633,10 @@ static int dt3155_mmap (struct file * file, struct vm_area_struct * vma)
vma->vm_flags |= VM_RESERVED;
/* they are mapping the registers or the buffer */
if ((offset == dt3155_status[minor].reg_addr &&
if ((offset == dts->reg_addr &&
vma->vm_end - vma->vm_start == PCI_PAGE_SIZE) ||
(offset == dt3155_status[minor].mem_addr &&
vma->vm_end - vma->vm_start == dt3155_status[minor].mem_size))
(offset == dts->mem_addr &&
vma->vm_end - vma->vm_start == dts->mem_size))
{
if (remap_pfn_range(vma,
vma->vm_start,
......@@ -672,21 +667,23 @@ static int dt3155_mmap (struct file * file, struct vm_area_struct * vma)
static int dt3155_open(struct inode* inode, struct file* filep)
{
int minor = MINOR(inode->i_rdev); /* what device are we opening? */
struct dt3155_status *dts = &dt3155_status[minor];
if (dt3155_dev_open[minor]) {
printk ("DT3155: Already opened by another process.\n");
return -EBUSY;
}
if (dt3155_status[minor].device_installed==0)
if (dts->device_installed==0)
{
printk("DT3155 Open Error: No such device dt3155 minor number %d\n",
minor);
return -EIO;
}
if (dt3155_status[minor].state != DT3155_STATE_IDLE) {
if (dts->state != DT3155_STATE_IDLE) {
printk ("DT3155: Not in idle state (state = %x)\n",
dt3155_status[minor].state);
dts->state);
return -EBUSY;
}
......@@ -714,9 +711,9 @@ static int dt3155_open(struct inode* inode, struct file* filep)
*****************************************************/
static int dt3155_close(struct inode *inode, struct file *filep)
{
int minor;
int minor = MINOR(inode->i_rdev); /* which device are we closing */
struct dt3155_status *dts = &dt3155_status[minor];
minor = MINOR(inode->i_rdev); /* which device are we closing */
if (!dt3155_dev_open[minor])
{
printk("DT3155: attempt to CLOSE a not OPEN device\n");
......@@ -725,7 +722,7 @@ static int dt3155_close(struct inode *inode, struct file *filep)
{
dt3155_dev_open[minor] = 0;
if (dt3155_status[minor].state != DT3155_STATE_IDLE)
if (dts->state != DT3155_STATE_IDLE)
{
quick_stop(minor);
}
......@@ -744,7 +741,8 @@ static ssize_t dt3155_read(struct file *filep, char __user *buf,
int minor = MINOR(filep->f_dentry->d_inode->i_rdev);
u32 offset;
int frame_index;
struct dt3155_fbuffer *fb = &dt3155_status[minor].fbuffer;
struct dt3155_status *dts = &dt3155_status[minor];
struct dt3155_fbuffer *fb = &dts->fbuffer;
struct frame_info *frame_info;
/* TODO: this should check the error flag and */
......@@ -763,7 +761,7 @@ static ssize_t dt3155_read(struct file *filep, char __user *buf,
* Note that if the driver is not opened in non_blocking mode,
* and the device is idle, then it could sit here forever! */
/* if (dt3155_status[minor].state == DT3155_STATE_IDLE)*/
/* if (dts->state == DT3155_STATE_IDLE)*/
/* return -EBUSY;*/
/* non-blocking reads should return if no data */
......@@ -798,13 +796,13 @@ static ssize_t dt3155_read(struct file *filep, char __user *buf,
frame_info = &fb->frame_info[frame_index];
/* make this an offset */
offset = frame_info->addr - dt3155_status[minor].mem_addr;
offset = frame_info->addr - dts->mem_addr;
put_user(offset, (unsigned int __user *)buf);
buf += sizeof(u32);
put_user(fb->frame_count, (unsigned int __user *)buf);
buf += sizeof(u32);
put_user(dt3155_status[minor].state, (unsigned int __user *)buf);
put_user(dts->state, (unsigned int __user *)buf);
buf += sizeof(u32);
if (copy_to_user(buf, frame_info, sizeof(*frame_info)))
return -EFAULT;
......@@ -859,6 +857,7 @@ static struct file_operations dt3155_fops = {
static int find_PCI (void)
{
struct pci_dev *pci_dev = NULL;
struct dt3155_status *dts;
int error, pci_index = 0;
unsigned short rev_device;
unsigned long base;
......@@ -867,7 +866,7 @@ static int find_PCI (void)
while ((pci_dev = pci_get_device
(DT3155_VENDORID, DT3155_DEVICEID, pci_dev)) != NULL)
{
pci_index ++;
dts = &dt3155_status[pci_index++];
/* Is it really there? */
if ((error =
......@@ -897,12 +896,12 @@ static int find_PCI (void)
}
DT_3155_DEBUG_MSG("DT3155: Base address 0 for device is %lx \n", base);
dt3155_status[pci_index-1].reg_addr = base;
dts->reg_addr = base;
/* Remap the base address to a logical address through which we
* can access it. */
dt3155_lbase[pci_index - 1] = ioremap(base, PCI_PAGE_SIZE);
dt3155_status[pci_index - 1].reg_addr = base;
dts->reg_addr = base;
DT_3155_DEBUG_MSG("DT3155: New logical address is %p \n",
dt3155_lbase[pci_index-1]);
if (!dt3155_lbase[pci_index-1])
......@@ -918,12 +917,12 @@ static int find_PCI (void)
}
DT_3155_DEBUG_MSG("DT3155: IRQ is %d \n",irq);
dt3155_status[pci_index-1].irq = irq;
dts->irq = irq;
/* Set flag: kth device found! */
dt3155_status[pci_index-1].device_installed = 1;
dts->device_installed = 1;
printk("DT3155: Installing device %d w/irq %d and address %p\n",
pci_index,
dt3155_status[pci_index-1].irq,
dts->irq,
dt3155_lbase[pci_index-1]);
}
......@@ -943,6 +942,7 @@ u32 allocatorAddr = 0;
*****************************************************/
int init_module(void)
{
struct dt3155_status *dts;
int index;
int rcode = 0;
char *devname[MAXBOARDS];
......@@ -970,18 +970,20 @@ int init_module(void)
/* DMA memory is taken care of in setup_buffers() */
for (index = 0; index < MAXBOARDS; index++)
{
dt3155_status[index].config.acq_mode = DT3155_MODE_FRAME;
dt3155_status[index].config.continuous = DT3155_ACQ;
dt3155_status[index].config.cols = DT3155_MAX_COLS;
dt3155_status[index].config.rows = DT3155_MAX_ROWS;
dt3155_status[index].state = DT3155_STATE_IDLE;
dts = &dt3155_status[index];
dts->config.acq_mode = DT3155_MODE_FRAME;
dts->config.continuous = DT3155_ACQ;
dts->config.cols = DT3155_MAX_COLS;
dts->config.rows = DT3155_MAX_ROWS;
dts->state = DT3155_STATE_IDLE;
/* find_PCI() will check if devices are installed; */
/* first assume they're not: */
dt3155_status[index].mem_addr = 0;
dt3155_status[index].mem_size = 0;
dt3155_status[index].state = DT3155_STATE_IDLE;
dt3155_status[index].device_installed = 0;
dts->mem_addr = 0;
dts->mem_size = 0;
dts->state = DT3155_STATE_IDLE;
dts->device_installed = 0;
}
/* Now let's find the hardware. find_PCI() will set ndevices to the
......@@ -1007,27 +1009,31 @@ int init_module(void)
/* for the buffers: Print the configuration. */
for( index = 0; index < ndevices; index++)
{
dts = &dt3155_status[index];
printk("DT3155: Device = %d; acq_mode = %d; "
"continuous = %d; cols = %d; rows = %d;\n",
index ,
dt3155_status[index].config.acq_mode,
dt3155_status[index].config.continuous,
dt3155_status[index].config.cols,
dt3155_status[index].config.rows);
dts->config.acq_mode,
dts->config.continuous,
dts->config.cols,
dts->config.rows);
printk("DT3155: m_addr = 0x%x; m_size = %ld; "
"state = %d; device_installed = %d\n",
dt3155_status[index].mem_addr,
(long int)dt3155_status[index].mem_size,
dt3155_status[index].state,
dt3155_status[index].device_installed);
dts->mem_addr,
(long int)dts->mem_size,
dts->state,
dts->device_installed);
}
/* Disable ALL interrupts */
int_csr_r.reg = 0;
for( index = 0; index < ndevices; index++)
{
dts = &dt3155_status[index];
writel(int_csr_r.reg, dt3155_lbase[index] + INT_CSR);
if(dt3155_status[index].device_installed)
if(dts->device_installed)
{
/*
* This driver *looks* like it can handle sharing interrupts,
......@@ -1036,13 +1042,13 @@ int init_module(void)
* as a reminder in case any problems arise. (SS)
*/
/* in older kernels flags are: SA_SHIRQ | SA_INTERRUPT */
rcode = request_irq(dt3155_status[index].irq, (void *)dt3155_isr,
rcode = request_irq(dts->irq, (void *)dt3155_isr,
IRQF_SHARED | IRQF_DISABLED, devname[index],
(void*) &dt3155_status[index]);
(void *)dts);
if(rcode < 0)
{
printk("DT3155: minor %d request_irq failed for IRQ %d\n",
index, dt3155_status[index].irq);
index, dts->irq);
unregister_chrdev(dt3155_major, "dt3155");
return rcode;
}
......@@ -1060,6 +1066,7 @@ int init_module(void)
*****************************************************/
void cleanup_module(void)
{
struct dt3155_status *dts;
int index;
printk("DT3155: cleanup_module called\n");
......@@ -1076,11 +1083,12 @@ void cleanup_module(void)
for(index = 0; index < ndevices; index++)
{
if(dt3155_status[index].device_installed == 1)
dts = &dt3155_status[index];
if(dts->device_installed == 1)
{
printk("DT3155: Freeing irq %d for device %d\n",
dt3155_status[index].irq, index);
free_irq(dt3155_status[index].irq, (void*)&dt3155_status[index]);
dts->irq, index);
free_irq(dts->irq, (void *)dts);
}
}
}
......
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