[PATCH] Staging: d53155_drv.c: cleanup fbuffer usage
From: H Hartley Sweeten
Date: Thu Jun 24 2010 - 12:33:33 EST
The global symbol dt3155_fbuffer[], declared in dt3155_isr.c, is really
just a pointer to dt3155_status[].fbuffer. To improve readability, make
some of the really long lines shorter, and make the buffer access more
consistent, use &dt3155_status[].fbuffer to access the buffer structure.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: Scott Smedley <ss@xxxxxxxxxx>
---
diff --git a/drivers/staging/dt3155/dt3155_drv.c b/drivers/staging/dt3155/dt3155_drv.c
index 88c9e59..f19cc1f 100644
--- a/drivers/staging/dt3155/dt3155_drv.c
+++ b/drivers/staging/dt3155/dt3155_drv.c
@@ -135,6 +135,8 @@ u32 unique_tag = 0;;
*/
static void quick_stop (int minor)
{
+ struct dt3155_fbuffer *fb = &dt3155_status[minor].fbuffer;
+
// TODO: scott was here
#if 1
int_csr_r.reg = readl(dt3155_lbase[minor] + INT_CSR);
@@ -146,11 +148,11 @@ static void quick_stop (int minor)
dt3155_status[minor].state &= ~(DT3155_STATE_STOP|0xff);
/* mark the system stopped: */
dt3155_status[minor].state |= DT3155_STATE_IDLE;
- dt3155_fbuffer[minor]->stop_acquire = 0;
- dt3155_fbuffer[minor]->even_stopped = 0;
+ fb->stop_acquire = 0;
+ fb->even_stopped = 0;
#else
dt3155_status[minor].state |= DT3155_STATE_STOP;
- dt3155_status[minor].fbuffer.stop_acquire = 1;
+ fb->stop_acquire = 1;
#endif
}
@@ -170,6 +172,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
unsigned long flags;
u32 buffer_addr;
void __iomem *mmio;
+ struct dt3155_fbuffer *fb;
/* find out who issued the interrupt */
for (index = 0; index < ndevices; index++) {
@@ -187,6 +190,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
}
mmio = dt3155_lbase[minor];
+ fb = &dt3155_status[minor].fbuffer;
/* Check for corruption and set a flag if so */
csr1_r.reg = readl(mmio + CSR1);
@@ -209,7 +213,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
{
- dt3155_fbuffer[minor]->frame_count++;
+ fb->frame_count++;
}
ReadI2C(mmio, EVEN_CSR, &i2c_even_csr.reg);
@@ -218,10 +222,10 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
int_csr_r.fld.FLD_END_EVE = 1;
/* disable the interrupt if last field */
- if (dt3155_fbuffer[minor]->stop_acquire)
+ if (fb->stop_acquire)
{
printk("dt3155: even stopped.\n");
- dt3155_fbuffer[minor]->even_stopped = 1;
+ fb->even_stopped = 1;
if (i2c_even_csr.fld.SNGL_EVE)
{
int_csr_r.fld.FLD_END_EVE_EN = 0;
@@ -241,9 +245,8 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* 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;
- buffer_addr = dt3155_fbuffer[minor]->
- frame_info[dt3155_fbuffer[minor]->active_buf].addr
- + (DT3155_MAX_ROWS / 2) * stride;
+ buffer_addr = fb->frame_info[fb->active_buf].addr +
+ (DT3155_MAX_ROWS / 2) * stride;
local_save_flags(flags);
local_irq_disable();
wake_up_interruptible(&dt3155_read_wait_queue[minor]);
@@ -262,13 +265,11 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* Note that we actually saw an even field meaning */
/* that subsequent odd field complete the frame */
- dt3155_fbuffer[minor]->even_happened = 1;
+ fb->even_happened = 1;
/* recording the time that the even field finished, this should be */
/* about time in the middle of the frame */
- do_gettimeofday(&(dt3155_fbuffer[minor]->
- frame_info[dt3155_fbuffer[minor]->
- active_buf].time));
+ do_gettimeofday(&fb->frame_info[fb->active_buf].time);
return;
}
@@ -280,15 +281,14 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* Clear the interrupt? */
int_csr_r.fld.FLD_END_ODD = 1;
- if (dt3155_fbuffer[minor]->even_happened ||
+ if (fb->even_happened ||
(dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
{
- dt3155_fbuffer[minor]->frame_count++;
+ fb->frame_count++;
}
- if (dt3155_fbuffer[minor]->stop_acquire &&
- dt3155_fbuffer[minor]->even_stopped)
+ if (fb->stop_acquire && fb->even_stopped)
{
printk(KERN_DEBUG "dt3155: stopping odd..\n");
if (i2c_odd_csr.fld.SNGL_ODD)
@@ -299,8 +299,8 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* mark the system stopped: */
dt3155_status[minor].state |= DT3155_STATE_IDLE;
- dt3155_fbuffer[minor]->stop_acquire = 0;
- dt3155_fbuffer[minor]->even_stopped = 0;
+ fb->stop_acquire = 0;
+ fb->even_stopped = 0;
printk(KERN_DEBUG "dt3155: state is now %x\n",
dt3155_status[minor].state);
@@ -316,7 +316,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* if the odd field has been acquired, then */
/* change the next dma location for both fields */
/* and wake up the process if sleeping */
- if (dt3155_fbuffer[minor]->even_happened ||
+ if (fb->even_happened ||
(dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
{
@@ -327,7 +327,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
#ifdef DEBUG_QUES_B
printques(minor);
#endif
- if (dt3155_fbuffer[minor]->nbuffers > 2)
+ if (fb->nbuffers > 2)
{
if (!are_empty_buffers(minor))
{
@@ -341,31 +341,26 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
/* The ready_que can't be full, since we know
* there is one active buffer right now, so it's safe
* to push the active buf on the ready_que. */
- push_ready(minor, dt3155_fbuffer[minor]->active_buf);
+ push_ready(minor, fb->active_buf);
/* There's at least 1 empty -- make it active */
- dt3155_fbuffer[minor]->active_buf = pop_empty(minor);
- dt3155_fbuffer[minor]->
- frame_info[dt3155_fbuffer[minor]->
- active_buf].tag = ++unique_tag;
+ fb->active_buf = pop_empty(minor);
+ fb->frame_info[fb->active_buf].tag = ++unique_tag;
}
else /* nbuffers == 2, special case */
{ /* There is 1 active buffer.
* If there is a locked buffer, keep the active buffer
* the same -- that means we drop a frame.
*/
- if (dt3155_fbuffer[minor]->locked_buf < 0)
+ if (fb->locked_buf < 0)
{
- push_ready(minor,
- dt3155_fbuffer[minor]->active_buf);
+ push_ready(minor, fb->active_buf);
if (are_empty_buffers(minor))
{
- dt3155_fbuffer[minor]->active_buf =
- pop_empty(minor);
+ fb->active_buf = pop_empty(minor);
}
else
{ /* no empty or locked buffers, so use a readybuf */
- dt3155_fbuffer[minor]->active_buf =
- pop_ready(minor);
+ fb->active_buf = pop_ready(minor);
}
}
}
@@ -374,7 +369,7 @@ static void dt3155_isr(int irq, void *dev_id, struct pt_regs *regs)
printques(minor);
#endif
- dt3155_fbuffer[minor]->even_happened = 0;
+ fb->even_happened = 0;
wake_up_interruptible(&dt3155_read_wait_queue[minor]);
@@ -383,8 +378,7 @@ 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 = dt3155_fbuffer[minor]->
- frame_info[dt3155_fbuffer[minor]->active_buf].addr;
+ buffer_addr = fb->frame_info[fb->active_buf].addr;
if ((dt3155_status[minor].state & DT3155_STATE_MODE) ==
DT3155_STATE_FLD)
{
@@ -421,13 +415,13 @@ static void dt3155_init_isr(int minor)
{
const u32 stride = dt3155_status[minor].config.cols;
void __iomem *mmio = dt3155_lbase[minor];
+ struct dt3155_fbuffer *fb = &dt3155_status[minor].fbuffer;
switch (dt3155_status[minor].state & DT3155_STATE_MODE)
{
case DT3155_STATE_FLD:
{
- even_dma_start_r = dt3155_status[minor].
- fbuffer.frame_info[dt3155_status[minor].fbuffer.active_buf].addr;
+ even_dma_start_r = fb->frame_info[fb->active_buf].addr;
even_dma_stride_r = 0;
odd_dma_stride_r = 0;
@@ -440,8 +434,7 @@ static void dt3155_init_isr(int minor)
case DT3155_STATE_FRAME:
default:
{
- even_dma_start_r = dt3155_status[minor].
- fbuffer.frame_info[dt3155_status[minor].fbuffer.active_buf].addr;
+ even_dma_start_r = fb->frame_info[fb->active_buf].addr;
odd_dma_start_r = even_dma_start_r + stride;
even_dma_stride_r = stride;
odd_dma_stride_r = stride;
@@ -514,6 +507,7 @@ 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;
if (minor >= MAXBOARDS || minor < 0)
return -ENODEV;
@@ -572,7 +566,7 @@ static int dt3155_ioctl(struct inode *inode,
case DT3155_STOP:
{
if (dt3155_status[minor].state & DT3155_STATE_STOP ||
- dt3155_status[minor].fbuffer.stop_acquire)
+ fb->stop_acquire)
return -EBUSY;
if (dt3155_status[minor].state == DT3155_STATE_IDLE)
@@ -589,8 +583,8 @@ static int dt3155_ioctl(struct inode *inode,
if (dt3155_status[minor].state != DT3155_STATE_IDLE)
return -EBUSY;
- dt3155_status[minor].fbuffer.stop_acquire = 0;
- dt3155_status[minor].fbuffer.frame_count = 0;
+ 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)
@@ -750,6 +744,7 @@ 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 frame_info *frame_info;
/* TODO: this should check the error flag and */
@@ -800,14 +795,14 @@ static ssize_t dt3155_read(struct file *filep, char __user *buf,
}
}
- frame_info = &dt3155_status[minor].fbuffer.frame_info[frame_index];
+ frame_info = &fb->frame_info[frame_index];
/* make this an offset */
offset = frame_info->addr - dt3155_status[minor].mem_addr;
put_user(offset, (unsigned int __user *)buf);
buf += sizeof(u32);
- put_user(dt3155_status[minor].fbuffer.frame_count, (unsigned int __user *)buf);
+ put_user(fb->frame_count, (unsigned int __user *)buf);
buf += sizeof(u32);
put_user(dt3155_status[minor].state, (unsigned int __user *)buf);
buf += sizeof(u32);
--
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