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Subject[PATCH v3 4/5] staging: comedi: addi_apci_1564: add Change-of-State interrupt subdevice and required functions
Date
This board supports an interrupt that can be generated by an AND/OR
combination of 16 of the input channels.

Create a separate subdevice to handle this interrupt.

The apci1564_di_config() function is used to configure which
inputs are used to generate the interrupt. Currently this function
is broken since it does not follow the comedi API for insn_config
functions. Fix this function by implementing the config instruction
INSN_CONFIG_DIGITAL_TRIG.

Add the remaining subdevice operations necessary for the interrupt
subdevice to support async commands.

Signed-off-by: Chase Southwood <chase.southwood@gmail.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
---
.../comedi/drivers/addi-data/hwdrv_apci1564.c | 44 +---
drivers/staging/comedi/drivers/addi_apci_1564.c | 250 +++++++++++++++++++--
2 files changed, 232 insertions(+), 62 deletions(-)

diff --git a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci1564.c b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci1564.c
index 732f43c..697ee76 100644
--- a/drivers/staging/comedi/drivers/addi-data/hwdrv_apci1564.c
+++ b/drivers/staging/comedi/drivers/addi-data/hwdrv_apci1564.c
@@ -26,12 +26,12 @@
#define APCI1564_ADDRESS_RANGE 128

/* Digital Input IRQ Function Selection */
-#define ADDIDATA_OR 0
-#define ADDIDATA_AND 1
+#define APCI1564_DI_INT_OR (0 << 1)
+#define APCI1564_DI_INT_AND (1 << 1)

/* Digital Input Interrupt Enable Disable. */
-#define APCI1564_DIGITAL_IP_INTERRUPT_ENABLE 0x4
-#define APCI1564_DIGITAL_IP_INTERRUPT_DISABLE 0xfffffffb
+#define APCI1564_DI_INT_ENABLE 0x4
+#define APCI1564_DI_INT_DISABLE 0xfffffffb

/* Digital Output Interrupt Enable Disable. */
#define APCI1564_DIGITAL_OP_VCC_INTERRUPT_ENABLE 0x1
@@ -90,42 +90,6 @@
#define APCI1564_TCW_WARN_TIMEBASE_REG(x) (0x1c + ((x) * 0x20))

/*
- * Configures the digital input Subdevice
- *
- * data[0] 1 = Enable interrupt, 0 = Disable interrupt
- * data[1] 0 = ADDIDATA Interrupt OR LOGIC, 1 = ADDIDATA Interrupt AND LOGIC
- * data[2] Interrupt mask for the mode 1
- * data[3] Interrupt mask for the mode 2
- */
-static int apci1564_di_config(struct comedi_device *dev,
- struct comedi_subdevice *s,
- struct comedi_insn *insn,
- unsigned int *data)
-{
- struct apci1564_private *devpriv = dev->private;
-
- devpriv->tsk_current = current;
-
- /* Set the digital input logic */
- if (data[0] == 1) {
- data[2] = data[2] << 4;
- data[3] = data[3] << 4;
- outl(data[2], devpriv->amcc_iobase + APCI1564_DI_INT_MODE1_REG);
- outl(data[3], devpriv->amcc_iobase + APCI1564_DI_INT_MODE2_REG);
- if (data[1] == ADDIDATA_OR)
- outl(0x4, devpriv->amcc_iobase + APCI1564_DI_IRQ_REG);
- else
- outl(0x6, devpriv->amcc_iobase + APCI1564_DI_IRQ_REG);
- } else {
- outl(0x0, devpriv->amcc_iobase + APCI1564_DI_INT_MODE1_REG);
- outl(0x0, devpriv->amcc_iobase + APCI1564_DI_INT_MODE2_REG);
- outl(0x0, devpriv->amcc_iobase + APCI1564_DI_IRQ_REG);
- }
-
- return insn->n;
-}
-
-/*
* Configures The Digital Output Subdevice.
*
* data[1] 0 = Disable VCC Interrupt, 1 = Enable VCC Interrupt
diff --git a/drivers/staging/comedi/drivers/addi_apci_1564.c b/drivers/staging/comedi/drivers/addi_apci_1564.c
index 1971da3..fec478c 100644
--- a/drivers/staging/comedi/drivers/addi_apci_1564.c
+++ b/drivers/staging/comedi/drivers/addi_apci_1564.c
@@ -8,6 +8,9 @@

struct apci1564_private {
unsigned int amcc_iobase; /* base of AMCC I/O registers */
+ unsigned int mode1; /* riding-edge/high level channels */
+ unsigned int mode2; /* falling-edge/low level channels */
+ unsigned int ctrl; /* interrupt mode OR (edge) . AND (level) */
unsigned int do_int_type;
unsigned char timer_select_mode;
unsigned char mode_select_register;
@@ -16,6 +19,38 @@ struct apci1564_private {

#include "addi-data/hwdrv_apci1564.c"

+static int apci1564_reset(struct comedi_device *dev)
+{
+ struct apci1564_private *devpriv = dev->private;
+
+ devpriv->do_int_type = 0;
+
+ /* Disable the input interrupts and reset status register */
+ outl(0x0, devpriv->amcc_iobase + APCI1564_DI_IRQ_REG);
+ inl(devpriv->amcc_iobase + APCI1564_DI_INT_STATUS_REG);
+ outl(0x0, devpriv->amcc_iobase + APCI1564_DI_INT_MODE1_REG);
+ outl(0x0, devpriv->amcc_iobase + APCI1564_DI_INT_MODE2_REG);
+
+ /* Reset the output channels and disable interrupts */
+ outl(0x0, devpriv->amcc_iobase + APCI1564_DO_REG);
+ outl(0x0, devpriv->amcc_iobase + APCI1564_DO_INT_CTRL_REG);
+
+ /* Reset the watchdog registers */
+ addi_watchdog_reset(devpriv->amcc_iobase + APCI1564_WDOG_REG);
+
+ /* Reset the timer registers */
+ outl(0x0, devpriv->amcc_iobase + APCI1564_TIMER_CTRL_REG);
+ outl(0x0, devpriv->amcc_iobase + APCI1564_TIMER_RELOAD_REG);
+
+ /* Reset the counter registers */
+ outl(0x0, dev->iobase + APCI1564_TCW_CTRL_REG(APCI1564_COUNTER1));
+ outl(0x0, dev->iobase + APCI1564_TCW_CTRL_REG(APCI1564_COUNTER2));
+ outl(0x0, dev->iobase + APCI1564_TCW_CTRL_REG(APCI1564_COUNTER3));
+ outl(0x0, dev->iobase + APCI1564_TCW_CTRL_REG(APCI1564_COUNTER4));
+
+ return 0;
+}
+
static irqreturn_t v_ADDI_Interrupt(int irq, void *d)
{
apci1564_interrupt(irq, d);
@@ -51,34 +86,187 @@ static int apci1564_do_insn_bits(struct comedi_device *dev,
return insn->n;
}

-static int apci1564_reset(struct comedi_device *dev)
+/*
+ * Change-Of-State (COS) interrupt configuration
+ *
+ * Channels 0 to 15 are interruptible. These channels can be configured
+ * to generate interrupts based on AND/OR logic for the desired channels.
+ *
+ * OR logic
+ * - reacts to rising or falling edges
+ * - interrupt is generated when any enabled channel
+ * meet the desired interrupt condition
+ *
+ * AND logic
+ * - reacts to changes in level of the selected inputs
+ * - interrupt is generated when all enabled channels
+ * meet the desired interrupt condition
+ * - after an interrupt, a change in level must occur on
+ * the selected inputs to release the IRQ logic
+ *
+ * The COS interrupt must be configured before it can be enabled.
+ *
+ * data[0] : INSN_CONFIG_DIGITAL_TRIG
+ * data[1] : trigger number (= 0)
+ * data[2] : configuration operation:
+ * COMEDI_DIGITAL_TRIG_DISABLE = no interrupts
+ * COMEDI_DIGITAL_TRIG_ENABLE_EDGES = OR (edge) interrupts
+ * COMEDI_DIGITAL_TRIG_ENABLE_LEVELS = AND (level) interrupts
+ * data[3] : left-shift for data[4] and data[5]
+ * data[4] : rising-edge/high level channels
+ * data[5] : falling-edge/low level channels
+ */
+static int apci1564_cos_insn_config(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
{
struct apci1564_private *devpriv = dev->private;
+ unsigned int shift, oldmask;
+
+ switch (data[0]) {
+ case INSN_CONFIG_DIGITAL_TRIG:
+ if (data[1] != 0)
+ return -EINVAL;
+ shift = data[3];
+ oldmask = (1U << shift) - 1;
+ switch (data[2]) {
+ case COMEDI_DIGITAL_TRIG_DISABLE:
+ devpriv->ctrl = 0;
+ devpriv->mode1 = 0;
+ devpriv->mode2 = 0;
+ apci1564_reset(dev);
+ break;
+ case COMEDI_DIGITAL_TRIG_ENABLE_EDGES:
+ if (devpriv->ctrl != (APCI1564_DI_INT_ENABLE |
+ APCI1564_DI_INT_OR)) {
+ /* switching to 'OR' mode */
+ devpriv->ctrl = APCI1564_DI_INT_ENABLE |
+ APCI1564_DI_INT_OR;
+ /* wipe old channels */
+ devpriv->mode1 = 0;
+ devpriv->mode2 = 0;
+ } else {
+ /* preserve unspecified channels */
+ devpriv->mode1 &= oldmask;
+ devpriv->mode2 &= oldmask;
+ }
+ /* configure specified channels */
+ devpriv->mode1 |= data[4] << shift;
+ devpriv->mode2 |= data[5] << shift;
+ break;
+ case COMEDI_DIGITAL_TRIG_ENABLE_LEVELS:
+ if (devpriv->ctrl != (APCI1564_DI_INT_ENABLE |
+ APCI1564_DI_INT_AND)) {
+ /* switching to 'AND' mode */
+ devpriv->ctrl = APCI1564_DI_INT_ENABLE |
+ APCI1564_DI_INT_AND;
+ /* wipe old channels */
+ devpriv->mode1 = 0;
+ devpriv->mode2 = 0;
+ } else {
+ /* preserve unspecified channels */
+ devpriv->mode1 &= oldmask;
+ devpriv->mode2 &= oldmask;
+ }
+ /* configure specified channels */
+ devpriv->mode1 |= data[4] << shift;
+ devpriv->mode2 |= data[5] << shift;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+ return insn->n;
+}

- devpriv->do_int_type = 0;
+static int apci1564_cos_insn_bits(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_insn *insn,
+ unsigned int *data)
+{
+ data[1] = s->state;

- /* Disable the input interrupts and reset status register */
- outl(0x0, devpriv->amcc_iobase + APCI1564_DI_IRQ_REG);
- inl(devpriv->amcc_iobase + APCI1564_DI_INT_STATUS_REG);
- outl(0x0, devpriv->amcc_iobase + APCI1564_DI_INT_MODE1_REG);
- outl(0x0, devpriv->amcc_iobase + APCI1564_DI_INT_MODE2_REG);
+ return 0;
+}

- /* Reset the output channels and disable interrupts */
- outl(0x0, devpriv->amcc_iobase + APCI1564_DO_REG);
- outl(0x0, devpriv->amcc_iobase + APCI1564_DO_INT_CTRL_REG);
+static int apci1564_cos_cmdtest(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ struct comedi_cmd *cmd)
+{
+ int err = 0;

- /* Reset the watchdog registers */
- addi_watchdog_reset(devpriv->amcc_iobase + APCI1564_WDOG_REG);
+ /* Step 1 : check if triggers are trivially valid */

- /* Reset the timer registers */
- outl(0x0, devpriv->amcc_iobase + APCI1564_TIMER_CTRL_REG);
- outl(0x0, devpriv->amcc_iobase + APCI1564_TIMER_RELOAD_REG);
+ err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
+ err |= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_EXT);
+ err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_FOLLOW);
+ err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
+ err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_NONE);

- /* Reset the counter registers */
- outl(0x0, dev->iobase + APCI1564_TCW_CTRL_REG(APCI1564_COUNTER1));
- outl(0x0, dev->iobase + APCI1564_TCW_CTRL_REG(APCI1564_COUNTER2));
- outl(0x0, dev->iobase + APCI1564_TCW_CTRL_REG(APCI1564_COUNTER3));
- outl(0x0, dev->iobase + APCI1564_TCW_CTRL_REG(APCI1564_COUNTER4));
+ if (err)
+ return 1;
+
+ /* Step 2a : make sure trigger sources are unique */
+ /* Step 2b : and mutually compatible */
+
+ if (err)
+ return 2;
+
+ /* Step 3: check if arguments are trivially valid */
+
+ err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
+ err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
+ err |= cfc_check_trigger_arg_is(&cmd->convert_arg, 0);
+ err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
+ err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
+
+ if (err)
+ return 3;
+
+ /* step 4: ignored */
+
+ if (err)
+ return 4;
+
+ return 0;
+}
+
+/*
+ * Change-Of-State (COS) 'do_cmd' operation
+ *
+ * Enable the COS interrupt as configured by apci1564_cos_insn_config().
+ */
+static int apci1564_cos_cmd(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ struct apci1564_private *devpriv = dev->private;
+
+ if (!devpriv->ctrl) {
+ dev_warn(dev->class_dev,
+ "Interrupts disabled due to mode configuration!\n");
+ return -EINVAL;
+ }
+
+ outl(devpriv->mode1, devpriv->amcc_iobase + APCI1564_DI_INT_MODE1_REG);
+ outl(devpriv->mode2, devpriv->amcc_iobase + APCI1564_DI_INT_MODE2_REG);
+ outl(devpriv->ctrl, devpriv->amcc_iobase + APCI1564_DI_IRQ_REG);
+
+ return 0;
+}
+
+static int apci1564_cos_cancel(struct comedi_device *dev,
+ struct comedi_subdevice *s)
+{
+ struct apci1564_private *devpriv = dev->private;
+
+ outl(0x0, devpriv->amcc_iobase + APCI1564_DI_IRQ_REG);
+ inl(devpriv->amcc_iobase + APCI1564_DI_INT_STATUS_REG);
+ outl(0x0, devpriv->amcc_iobase + APCI1564_DI_INT_MODE1_REG);
+ outl(0x0, devpriv->amcc_iobase + APCI1564_DI_INT_MODE2_REG);

return 0;
}
@@ -113,7 +301,7 @@ static int apci1564_auto_attach(struct comedi_device *dev,
dev->irq = pcidev->irq;
}

- ret = comedi_alloc_subdevices(dev, 3);
+ ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;

@@ -125,7 +313,6 @@ static int apci1564_auto_attach(struct comedi_device *dev,
s->maxdata = 1;
s->len_chanlist = 32;
s->range_table = &range_digital;
- s->insn_config = apci1564_di_config;
s->insn_bits = apci1564_di_insn_bits;

/* Allocate and Initialise DO Subdevice Structures */
@@ -152,6 +339,25 @@ static int apci1564_auto_attach(struct comedi_device *dev,
s->insn_read = apci1564_timer_read;
s->insn_config = apci1564_timer_config;

+ /* Change-Of-State (COS) interrupt subdevice */
+ s = &dev->subdevices[3];
+ if (dev->irq) {
+ dev->read_subdev = s;
+ s->type = COMEDI_SUBD_DI;
+ s->subdev_flags = SDF_READABLE | SDF_CMD_READ;
+ s->n_chan = 1;
+ s->maxdata = 1;
+ s->range_table = &range_digital;
+ s->len_chanlist = 1;
+ s->insn_config = apci1564_cos_insn_config;
+ s->insn_bits = apci1564_cos_insn_bits;
+ s->do_cmdtest = apci1564_cos_cmdtest;
+ s->do_cmd = apci1564_cos_cmd;
+ s->cancel = apci1564_cos_cancel;
+ } else {
+ s->type = COMEDI_SUBD_UNUSED;
+ }
+
return 0;
}

--
1.9.3


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