From: Ian Abbott <abbotti@mev.co.uk>
To: driverdev-devel@linuxdriverproject.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ian Abbott <abbotti@mev.co.uk>,
H Hartley Sweeten <hartleys@visionengravers.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH 21/28] staging: comedi: amplc_pci230: replace `state` member with bitfields
Date: Mon, 1 Sep 2014 12:03:53 +0100 [thread overview]
Message-ID: <1409569440-10979-22-git-send-email-abbotti@mev.co.uk> (raw)
In-Reply-To: <1409569440-10979-1-git-send-email-abbotti@mev.co.uk>
The `state` member of `struct pci230_private` is used with the atomic
bit-op functions and has a couple of bits defined, `AI_CMD_STARTED` and
`AO_CMD_STARTED`. Spin-locks are used to protect the clearing of these
bits and other stuff. No special protection is used for setting these
bits. Replace the `state` member with a couple of new, single-bit
bitfield members, `ai_cmd_started` and `ao_cmd_started` to save some
space.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
---
drivers/staging/comedi/drivers/amplc_pci230.c | 27 +++++++++++++--------------
1 file changed, 13 insertions(+), 14 deletions(-)
diff --git a/drivers/staging/comedi/drivers/amplc_pci230.c b/drivers/staging/comedi/drivers/amplc_pci230.c
index 29e6016..7a8291a 100644
--- a/drivers/staging/comedi/drivers/amplc_pci230.c
+++ b/drivers/staging/comedi/drivers/amplc_pci230.c
@@ -443,10 +443,6 @@ enum {
/* Current CPU. XXX should this be hard_smp_processor_id()? */
#define THISCPU smp_processor_id()
-/* State flags for atomic bit operations */
-#define AI_CMD_STARTED 0
-#define AO_CMD_STARTED 1
-
/*
* Board descriptions for the two boards supported.
*/
@@ -495,7 +491,6 @@ struct pci230_private {
spinlock_t ai_stop_spinlock; /* Spin lock for stopping AI command */
spinlock_t ao_stop_spinlock; /* Spin lock for stopping AO command */
unsigned long daqio; /* PCI230's DAQ I/O space */
- unsigned long state; /* State flags */
unsigned int ai_scan_count; /* Number of AI scans remaining */
unsigned int ai_scan_pos; /* Current position within AI scan */
unsigned int ao_scan_count; /* Number of AO scans remaining. */
@@ -511,6 +506,8 @@ struct pci230_private {
bool intr_running:1; /* Flag set in interrupt routine */
bool ai_bipolar:1; /* Flag AI range is bipolar */
bool ao_bipolar:1; /* Flag AO range is bipolar */
+ bool ai_cmd_started:1; /* Flag AI command started */
+ bool ao_cmd_started:1; /* Flag AO command started */
};
/* PCI230 clock source periods in ns */
@@ -1060,11 +1057,12 @@ static void pci230_ao_stop(struct comedi_device *dev,
struct pci230_private *devpriv = dev->private;
unsigned long irqflags;
unsigned char intsrc;
- int started;
+ bool started;
struct comedi_cmd *cmd;
spin_lock_irqsave(&devpriv->ao_stop_spinlock, irqflags);
- started = test_and_clear_bit(AO_CMD_STARTED, &devpriv->state);
+ started = devpriv->ao_cmd_started;
+ devpriv->ao_cmd_started = false;
spin_unlock_irqrestore(&devpriv->ao_stop_spinlock, irqflags);
if (!started)
return;
@@ -1263,7 +1261,7 @@ static int pci230_ao_inttrig_scan_begin(struct comedi_device *dev,
return -EINVAL;
spin_lock_irqsave(&devpriv->ao_stop_spinlock, irqflags);
- if (test_bit(AO_CMD_STARTED, &devpriv->state)) {
+ if (devpriv->ao_cmd_started) {
/* Perform scan. */
if (devpriv->hwver < 2) {
/* Not using DAC FIFO. */
@@ -1296,7 +1294,7 @@ static void pci230_ao_start(struct comedi_device *dev,
struct comedi_cmd *cmd = &async->cmd;
unsigned long irqflags;
- set_bit(AO_CMD_STARTED, &devpriv->state);
+ devpriv->ao_cmd_started = true;
if (cmd->stop_src == TRIG_COUNT && devpriv->ao_scan_count == 0) {
/* An empty acquisition! */
async->events |= COMEDI_CB_EOA;
@@ -1852,7 +1850,7 @@ static int pci230_ai_inttrig_convert(struct comedi_device *dev,
return -EINVAL;
spin_lock_irqsave(&devpriv->ai_stop_spinlock, irqflags);
- if (test_bit(AI_CMD_STARTED, &devpriv->state)) {
+ if (devpriv->ai_cmd_started) {
unsigned int delayus;
/*
@@ -1899,7 +1897,7 @@ static int pci230_ai_inttrig_scan_begin(struct comedi_device *dev,
return -EINVAL;
spin_lock_irqsave(&devpriv->ai_stop_spinlock, irqflags);
- if (test_bit(AI_CMD_STARTED, &devpriv->state)) {
+ if (devpriv->ai_cmd_started) {
/* Trigger scan by waggling CT0 gate source. */
zgat = GAT_CONFIG(0, GAT_GND);
outb(zgat, dev->iobase + PCI230_ZGAT_SCE);
@@ -1917,10 +1915,11 @@ static void pci230_ai_stop(struct comedi_device *dev,
struct pci230_private *devpriv = dev->private;
unsigned long irqflags;
struct comedi_cmd *cmd;
- int started;
+ bool started;
spin_lock_irqsave(&devpriv->ai_stop_spinlock, irqflags);
- started = test_and_clear_bit(AI_CMD_STARTED, &devpriv->state);
+ started = devpriv->ai_cmd_started;
+ devpriv->ai_cmd_started = false;
spin_unlock_irqrestore(&devpriv->ai_stop_spinlock, irqflags);
if (!started)
return;
@@ -1970,7 +1969,7 @@ static void pci230_ai_start(struct comedi_device *dev,
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
- set_bit(AI_CMD_STARTED, &devpriv->state);
+ devpriv->ai_cmd_started = true;
if (cmd->stop_src == TRIG_COUNT && devpriv->ai_scan_count == 0) {
/* An empty acquisition! */
async->events |= COMEDI_CB_EOA;
--
2.0.4
next prev parent reply other threads:[~2014-09-01 11:06 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-01 11:03 [PATCH 00/28] staging: comedi: more clean-up and remove legacy attach Ian Abbott
2014-09-01 11:03 ` [PATCH 01/28] staging: comedi: amplc_pci230: update MODULE_DESCRIPTION() Ian Abbott
2014-09-01 11:03 ` [PATCH 02/28] staging: comedi: amplc_pci230: don't use multiple blank lines Ian Abbott
2014-09-01 11:03 ` [PATCH 03/28] staging: comedi: amplc_pci230: remove some unnecessary parentheses Ian Abbott
2014-09-01 11:03 ` [PATCH 04/28] staging: comedi: amplc_pci230: collapse some 'else { if' chains Ian Abbott
2014-09-01 11:03 ` [PATCH 05/28] staging: comedi: amplc_pci230: remove "legacy" attach mechanism Ian Abbott
2014-09-01 11:03 ` [PATCH 06/28] staging: comedi: amplc_pci230: no need to manipulate PCI ref count Ian Abbott
2014-09-01 11:03 ` [PATCH 07/28] staging: comedi: amplc_pci230: set detach handler to comedi_pci_detach() Ian Abbott
2014-09-01 11:03 ` [PATCH 08/28] staging: comedi: amplc_pci230: absorb pci230_attach_common() Ian Abbott
2014-09-01 11:03 ` [PATCH 09/28] staging: comedi: amplc_pci230: no need to comedi_set_hw_dev() here Ian Abbott
2014-09-01 11:03 ` [PATCH 10/28] staging: comedi: amplc_pci230: absorb pci230_alloc_private() Ian Abbott
2014-09-01 11:03 ` [PATCH 11/28] staging: comedi: amplc_pci230: remove ai_chans member Ian Abbott
2014-09-01 11:03 ` [PATCH 12/28] staging: comedi: amplc_pci230: remove ao_chans member Ian Abbott
2014-09-01 11:03 ` [PATCH 13/28] staging: comedi: amplc_pci230: shrink struct pci230_board Ian Abbott
2014-09-01 11:03 ` [PATCH 14/28] staging: comedi: amplc_pci230: simplify pci230_ao_mangle_datum() Ian Abbott
2014-09-01 11:03 ` [PATCH 15/28] staging: comedi: amplc_pci230: simplify pci230_ai_read() Ian Abbott
2014-09-01 11:03 ` [PATCH 16/28] staging: comedi: amplc_pci230: remove 'inline' Ian Abbott
2014-09-01 11:03 ` [PATCH 17/28] staging: comedi: amplc_pci230: rename pci230_ai_rinsn() Ian Abbott
2014-09-01 11:03 ` [PATCH 18/28] staging: comedi: amplc_pci230: add `pci230_` prefix to functions Ian Abbott
2014-09-01 11:03 ` [PATCH 19/28] staging: comedi: amplc_pci230: use comedi_range_is_bipolar() Ian Abbott
2014-09-01 11:03 ` [PATCH 20/28] staging: comedi: amplc_pci230: make `intr_running` a bitfield Ian Abbott
2014-09-01 11:03 ` Ian Abbott [this message]
2014-09-01 11:03 ` [PATCH 22/28] staging: comedi: amplc_pci230: rewrite shared resource handling Ian Abbott
2014-09-01 11:03 ` [PATCH 23/28] staging: comedi: amplc_pci230: reduce indentation in pci230_ao_inttrig_scan_begin() Ian Abbott
2014-09-01 11:03 ` [PATCH 24/28] staging: comedi: amplc_pci230: reduce indentation in pci230_ao_start() Ian Abbott
2014-09-01 11:03 ` [PATCH 25/28] staging: comedi: amplc_pci230: reduce indentation in pci230_ai_inttrig_convert() Ian Abbott
2014-09-01 11:03 ` [PATCH 26/28] staging: comedi: amplc_pci230: reduce indentation in pci230_ai_start() Ian Abbott
2014-09-01 11:03 ` [PATCH 27/28] staging: comedi: amplc_pci230: change pci230_handle_ao_fifo() return type Ian Abbott
2014-09-01 11:04 ` [PATCH 28/28] staging: comedi: amplc_pci230: simplify interrupt enable handling Ian Abbott
2014-09-02 17:43 ` [PATCH 00/28] staging: comedi: more clean-up and remove legacy attach Hartley Sweeten
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