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Commit f32376e9 authored Jun 12, 2013 by H Hartley Sweeten Committed by Greg Kroah-Hartman Jun 17, 2013

staging: comedi: addi_apci_3xxx: fix the analog input subdevice



The analog input subdevice support functions in hwdrv_apci3xxx.c
do not follow the comedi API.

The (*insn_config) function overrides the INSN_CONFIG_DIO_INPUT
instruction as an internal APCI3XXX_CONFIGURATION instruction. The
APCI3XXX_CONFIGURATION instruction requires 4 data parameters but
the comedi core sanity checks the INSN_CONFIG_DIO_INPUT instruction
which only has 1 data parameter. Because of this the (*insn_config)
function can never be called.

The (*insn_read) function is supposed to do "one-shot" or "software-
triggered" reads and return the data. The function in hwdrv_apci3xxx.c
does do this but it also is used to optionally start a "hardware-
triggered" conversion. Hardware-triggered conversions should be done
with the comedi_async command functions.

Delete the hwrdv_apci3xxx.c file and fix the analog input subdevice
in the driver by:

1) add a new (*insn_read) function for "one-shot" reads
2) implement the (*do_cmdtest) and (*do_cmd) functions for
   "hardware-triggered" asyncronous reads
3) fix the interrupt handler to return the read data via the
   comedi_async buffer

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 66573991

drivers/staging/comedi/drivers/addi-data/hwdrv_apci3xxx.c

deleted100644 → 0

+0 −178

Original line number	Diff line number	Diff line
		#define APCI3XXX_SINGLE 0
		#define APCI3XXX_DIFF 1
		#define APCI3XXX_CONFIGURATION 0

		/*
		+----------------------------------------------------------------------------+
		\| ANALOG INPUT FUNCTIONS \|
		+----------------------------------------------------------------------------+
		*/

		/*
		+----------------------------------------------------------------------------+
		\| Function Name : int i_APCI3XXX_TestConversionStarted \|
		\| (struct comedi_device *dev) \|
		+----------------------------------------------------------------------------+
		\| Task Test if any conversion started \|
		+----------------------------------------------------------------------------+
		\| Input Parameters : - \|
		+----------------------------------------------------------------------------+
		\| Output Parameters : - \|
		+----------------------------------------------------------------------------+
		\| Return Value : 0 : Conversion not started \|
		\| 1 : Conversion started \|
		+----------------------------------------------------------------------------+
		*/
		static int i_APCI3XXX_TestConversionStarted(struct comedi_device *dev)
		{
		struct apci3xxx_private *devpriv = dev->private;

		if ((readl(devpriv->mmio + 8) & 0x80000) == 0x80000)
		return 1;
		else
		return 0;

		}

		static int apci3xxx_ai_configure(struct comedi_device *dev,
		struct comedi_subdevice *s,
		struct comedi_insn *insn,
		unsigned int *data)
		{
		const struct apci3xxx_boardinfo *board = comedi_board(dev);
		struct apci3xxx_private *devpriv = dev->private;
		unsigned int time_base = data[2];
		unsigned int reload_time = data[3];
		unsigned int acq_ns;

		if (time_base > 2)
		return -EINVAL;

		if (reload_time > 0xffff)
		return -EINVAL;

		time_base = 1 << time_base;
		if (!(board->ai_conv_units & time_base))
		return -EINVAL;

		switch (time_base) {
		case CONV_UNIT_NS:
		acq_ns = reload_time;
		case CONV_UNIT_US:
		acq_ns = reload_time * 1000;
		case CONV_UNIT_MS:
		acq_ns = reload_time * 1000000;
		default:
		return -EINVAL;
		}

		/* Test the convert time value */
		if (acq_ns < board->ai_min_acq_ns)
		return -EINVAL;

		/* Test if conversion not started */
		if (i_APCI3XXX_TestConversionStarted(dev))
		return -EBUSY;

		devpriv->ui_EocEosConversionTime = reload_time;
		devpriv->b_EocEosConversionTimeBase = time_base;

		/* Set the convert timing unit */
		writel(time_base, devpriv->mmio + 36);

		/* Set the convert timing */
		writel(reload_time, devpriv->mmio + 32);

		return insn->n;
		}

		static int apci3xxx_ai_insn_config(struct comedi_device *dev,
		struct comedi_subdevice *s,
		struct comedi_insn *insn,
		unsigned int *data)
		{
		switch (data[0]) {
		case APCI3XXX_CONFIGURATION:
		if (insn->n == 4)
		return apci3xxx_ai_configure(dev, s, insn, data);
		else
		return -EINVAL;
		break;
		default:
		return -EINVAL;
		}
		}

		static int apci3xxx_ai_insn_read(struct comedi_device *dev,
		struct comedi_subdevice *s,
		struct comedi_insn *insn,
		unsigned int *data)
		{
		struct apci3xxx_private *devpriv = dev->private;
		unsigned int chan = CR_CHAN(insn->chanspec);
		unsigned int range = CR_RANGE(insn->chanspec);
		unsigned int aref = CR_AREF(insn->chanspec);
		unsigned char use_interrupt = 0; /* FIXME: use interrupts */
		unsigned int delay_mode;
		unsigned int val;
		int i;

		if (!use_interrupt && insn->n == 0)
		return insn->n;

		if (i_APCI3XXX_TestConversionStarted(dev))
		return -EBUSY;

		/* Clear the FIFO */
		writel(0x10000, devpriv->mmio + 12);

		/* Get and save the delay mode */
		delay_mode = readl(devpriv->mmio + 4);
		delay_mode &= 0xfffffef0;

		/* Channel configuration selection */
		writel(delay_mode, devpriv->mmio + 4);

		/* Make the configuration */
		val = (range & 3) \| ((range >> 2) << 6) \|
		((aref == AREF_DIFF) << 7);
		writel(val, devpriv->mmio + 0);

		/* Channel selection */
		writel(delay_mode \| 0x100, devpriv->mmio + 4);
		writel(chan, devpriv->mmio + 0);

		/* Restore delay mode */
		writel(delay_mode, devpriv->mmio + 4);

		/* Set the number of sequence to 1 */
		writel(1, devpriv->mmio + 48);

		/* Save the interrupt flag */
		devpriv->b_EocEosInterrupt = use_interrupt;

		/* Save the number of channels */
		devpriv->ui_AiNbrofChannels = 1;

		/* Test if interrupt not used */
		if (!use_interrupt) {
		for (i = 0; i < insn->n; i++) {
		/* Start the conversion */
		writel(0x80000, devpriv->mmio + 8);

		/* Wait the EOS */
		do {
		val = readl(devpriv->mmio + 20);
		val &= 0x1;
		} while (!val);

		/* Read the analog value */
		data[i] = readl(devpriv->mmio + 28);
		}
		} else {
		/* Start the conversion */
		writel(0x180000, devpriv->mmio + 8);
		}

		return insn->n;
		}

drivers/staging/comedi/drivers/addi_apci_3xxx.c

+230 −24

Original line number	Diff line number	Diff line
		@@ -27,6 +27,8 @@

		#include "../comedidev.h"

		#include "comedi_fc.h"

		#define CONV_UNIT_NS (1 << 0)
		#define CONV_UNIT_US (1 << 1)
		#define CONV_UNIT_MS (1 << 2)
		@@ -351,21 +353,17 @@ static const struct apci3xxx_boardinfo apci3xxx_boardtypes[] = {

		struct apci3xxx_private {
		void __iomem *mmio;
		unsigned int ui_AiNbrofChannels; /* how many channels is measured */
		unsigned int ui_AiReadData[32];
		unsigned char b_EocEosInterrupt;
		unsigned int ui_EocEosConversionTime;
		unsigned char b_EocEosConversionTimeBase;
		unsigned int ai_timer;
		unsigned char ai_time_base;
		};

		#include "addi-data/hwdrv_apci3xxx.c"

		static irqreturn_t apci3xxx_irq_handler(int irq, void *d)
		{
		struct comedi_device *dev = d;
		struct apci3xxx_private *devpriv = dev->private;
		struct comedi_subdevice *s = dev->read_subdev;
		unsigned int status;
		int i;
		unsigned int val;

		/* Test if interrupt occur */
		status = readl(devpriv->mmio + 16);
		@@ -373,35 +371,247 @@ static irqreturn_t apci3xxx_irq_handler(int irq, void *d)
		/* Reset the interrupt */
		writel(status, devpriv->mmio + 16);

		/* Test if interrupt enabled */
		if (devpriv->b_EocEosInterrupt == 1) {
		/* Read all analog inputs value */
		for (i = 0; i < devpriv->ui_AiNbrofChannels; i++) {
		val = readl(devpriv->mmio + 28);
		comedi_buf_put(s->async, val);

		s->async->events \|= COMEDI_CB_EOA;
		comedi_event(dev, s);

		return IRQ_HANDLED;
		}
		return IRQ_NONE;
		}

		static int apci3xxx_ai_started(struct comedi_device *dev)
		{
		struct apci3xxx_private *devpriv = dev->private;

		if ((readl(devpriv->mmio + 8) & 0x80000) == 0x80000)
		return 1;
		else
		return 0;

		}

		static int apci3xxx_ai_setup(struct comedi_device *dev, unsigned int chanspec)
		{
		struct apci3xxx_private *devpriv = dev->private;
		unsigned int chan = CR_CHAN(chanspec);
		unsigned int range = CR_RANGE(chanspec);
		unsigned int aref = CR_AREF(chanspec);
		unsigned int delay_mode;
		unsigned int val;

		val = readl(devpriv->mmio + 28);
		devpriv->ui_AiReadData[i] = val;
		if (apci3xxx_ai_started(dev))
		return -EBUSY;

		/* Clear the FIFO */
		writel(0x10000, devpriv->mmio + 12);

		/* Get and save the delay mode */
		delay_mode = readl(devpriv->mmio + 4);
		delay_mode &= 0xfffffef0;

		/* Channel configuration selection */
		writel(delay_mode, devpriv->mmio + 4);

		/* Make the configuration */
		val = (range & 3) \| ((range >> 2) << 6) \|
		((aref == AREF_DIFF) << 7);
		writel(val, devpriv->mmio + 0);

		/* Channel selection */
		writel(delay_mode \| 0x100, devpriv->mmio + 4);
		writel(chan, devpriv->mmio + 0);

		/* Restore delay mode */
		writel(delay_mode, devpriv->mmio + 4);

		/* Set the number of sequence to 1 */
		writel(1, devpriv->mmio + 48);

		return 0;
		}

		/* Set the interrupt flag */
		devpriv->b_EocEosInterrupt = 2;
		static int apci3xxx_ai_insn_read(struct comedi_device *dev,
		struct comedi_subdevice *s,
		struct comedi_insn *insn,
		unsigned int *data)
		{
		struct apci3xxx_private *devpriv = dev->private;
		unsigned int val;
		int ret;
		int i;

		ret = apci3xxx_ai_setup(dev, insn->chanspec);
		if (ret)
		return ret;

		for (i = 0; i < insn->n; i++) {
		/* Start the conversion */
		writel(0x80000, devpriv->mmio + 8);

		/* Wait the EOS */
		do {
		val = readl(devpriv->mmio + 20);
		val &= 0x1;
		} while (!val);

		/* FIXME: comedi_event() */
		/* Read the analog value */
		data[i] = readl(devpriv->mmio + 28);
		}

		return insn->n;
		}

		static int apci3xxx_ai_ns_to_timer(struct comedi_device *dev,
		unsigned int *ns, int round_mode)
		{
		const struct apci3xxx_boardinfo *board = comedi_board(dev);
		struct apci3xxx_private *devpriv = dev->private;
		unsigned int base;
		unsigned int timer;
		int time_base;

		/* time_base: 0 = ns, 1 = us, 2 = ms */
		for (time_base = 0; time_base < 3; time_base++) {
		/* skip unsupported time bases */
		if (!(board->ai_conv_units & (1 << time_base)))
		continue;

		switch (time_base) {
		case 0:
		base = 1;
		break;
		case 1:
		base = 1000;
		break;
		case 2:
		base = 1000000;
		break;
		}

		switch (round_mode) {
		case TRIG_ROUND_NEAREST:
		default:
		timer = (*ns + base / 2) / base;
		break;
		case TRIG_ROUND_DOWN:
		timer = *ns / base;
		break;
		case TRIG_ROUND_UP:
		timer = (*ns + base - 1) / base;
		break;
		}

		if (timer < 0x10000) {
		devpriv->ai_time_base = time_base;
		devpriv->ai_timer = timer;
		ns = timer time_base;
		return 0;
		}
		return IRQ_RETVAL(1);
		}
		return -EINVAL;
		}

		static int apci3xxx_ai_cmdtest(struct comedi_device *dev,
		struct comedi_subdevice *s,
		struct comedi_cmd *cmd)
		{
		const struct apci3xxx_boardinfo *board = comedi_board(dev);
		int err = 0;
		unsigned int tmp;

		/* Step 1 : check if triggers are trivially valid */

		err \|= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
		err \|= cfc_check_trigger_src(&cmd->scan_begin_src, TRIG_FOLLOW);
		err \|= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER);
		err \|= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
		err \|= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT \| TRIG_NONE);

		if (err)
		return 1;

		/* Step 2a : make sure trigger sources are unique */

		err \|= cfc_check_trigger_is_unique(cmd->stop_src);

		/* 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_min(&cmd->convert_arg,
		board->ai_min_acq_ns);
		err \|= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);

		if (cmd->stop_src == TRIG_COUNT)
		err \|= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
		else /* TRIG_NONE */
		err \|= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);

		if (err)
		return 3;

		/* step 4: fix up any arguments */

		/*
		* FIXME: The hardware supports multiple scan modes but the original
		* addi-data driver only supported reading a single channel with
		* interrupts. Need a proper datasheet to fix this.
		*
		* The following scan modes are supported by the hardware:
		* 1) Single software scan
		* 2) Single hardware triggered scan
		* 3) Continuous software scan
		* 4) Continuous software scan with timer delay
		* 5) Continuous hardware triggered scan
		* 6) Continuous hardware triggered scan with timer delay
		*
		* For now, limit the chanlist to a single channel.
		*/
		if (cmd->chanlist_len > 1) {
		cmd->chanlist_len = 1;
		err \|= -EINVAL;
		}

		tmp = cmd->convert_arg;
		err \|= apci3xxx_ai_ns_to_timer(dev, &cmd->convert_arg,
		cmd->flags & TRIG_ROUND_MASK);
		if (tmp != cmd->convert_arg)
		err \|= -EINVAL;

		if (err)
		return 4;

		return 0;
		}

		static int apci3xxx_ai_cmd(struct comedi_device *dev,
		struct comedi_subdevice *s)
		{
		struct apci3xxx_private *devpriv = dev->private;
		struct comedi_cmd *cmd = &s->async->cmd;
		int ret;

		ret = apci3xxx_ai_setup(dev, cmd->chanlist[0]);
		if (ret)
		return ret;

		/* Set the convert timing unit */
		writel(devpriv->ai_time_base, devpriv->mmio + 36);

		/* Set the convert timing */
		writel(devpriv->ai_timer, devpriv->mmio + 32);

		/* Start the conversion */
		writel(0x180000, devpriv->mmio + 8);

		return 0;
		}

		@@ -553,9 +763,6 @@ static int apci3xxx_reset(struct comedi_device *dev)
		/* Disable the interrupt */
		disable_irq(dev->irq);

		/* Reset the interrupt flag */
		devpriv->b_EocEosInterrupt = 0;

		/* Clear the start command */
		writel(0, devpriv->mmio + 8);

		@@ -625,7 +832,6 @@ static int apci3xxx_auto_attach(struct comedi_device *dev,
		s->maxdata = board->ai_maxdata;
		s->len_chanlist = s->n_chan;
		s->range_table = &apci3xxx_ai_range;
		s->insn_config = apci3xxx_ai_insn_config;
		s->insn_read = apci3xxx_ai_insn_read;
		if (dev->irq) {
		dev->read_subdev = s;

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