staging: comedi: ii_pci20kc: cleanup the ao subdevice

The PCI-20006M-1 and PCI-20006M-2 modules can both provide an
analog output subdevice in this driver. Fix the module init code
to detect both of them.

The analog output can support +/-5, 0-10, or +/-10 volt ranges
depending on jumpers on the board. Report all the ranges to the
user instead of relying on the configuration options to set the
range. The user can then select the appropriate range depending
on how they have configured the hardware.

Tidy up the (*insn_{read,write})() functions to work like the
comedi core expects.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/ii_pci20kc.c

@@ -63,11 +63,6 @@ the other carrier boards with small modifications.  Modules supported
   7   second option for module 3
 
 options for PCI-20006M:
-  first:   Analog output channel 0 range configuration
-	     0  bipolar 10  (-10V -- +10V)
-	     1  unipolar 10  (0V -- +10V)
-	     2  bipolar 5  (-5V -- 5V)
-  second:  Analog output channel 1 range configuration
 
 options for PCI-20341M:
   first:   Analog input gain configuration
@@ -117,15 +112,16 @@ options for PCI-20341M:
 #define II20K_CTRL23_DIO2_IN		(1 << 4)
 #define II20K_CTRL23_DIO3_IN		(1 << 1)
 
+#define II20K_ID_PCI20006M_1		0xe2	/* 1 AO channels */
+#define II20K_ID_PCI20006M_2		0xe3	/* 2 AO channels */
+#define II20K_AO_STRB_REG(x)		(0x0b + ((x) * 0x08))
+#define II20K_AO_LSB_REG(x)		(0x0d + ((x) * 0x08))
+#define II20K_AO_MSB_REG(x)		(0x0e + ((x) * 0x08))
+#define II20K_AO_STRB_BOTH_REG		0x1b
+
 #define PCI20341_ID			0x77
-#define PCI20006_ID			0xe3
 #define PCI20xxx_EMPTY_ID		0xff
 
-#define PCI20006_LCHAN0			0x0d
-#define PCI20006_STROBE0		0x0b
-#define PCI20006_LCHAN1			0x15
-#define PCI20006_STROBE1		0x13
-
 #define PCI20341_INIT			0x04
 #define PCI20341_REPMODE		0x00	/* single shot mode */
 #define PCI20341_PACER			0x00	/* Hardware Pacer disabled */
@@ -144,6 +140,14 @@ options for PCI-20341M:
 #define PCI20341_MUX			0x04	/* Enable on-board MUX */
 #define PCI20341_SCANLIST		0x80	/* Channel/Gain Scan List */
 
+/* the AO range is set by jumpers on the 20006M module */
+static const struct comedi_lrange ii20k_ao_ranges = {
+	3, {
+		BIP_RANGE(5),	/* Chan 0 - W1/W3 in   Chan 1 - W2/W4 in  */
+		UNI_RANGE(10),	/* Chan 0 - W1/W3 out  Chan 1 - W2/W4 in  */
+		BIP_RANGE(10)	/* Chan 0 - W1/W3 in   Chan 1 - W2/W4 out */
+	}
+};
 static const struct comedi_lrange range_bipolar0_5 = {
 	1, {
 		BIP_RANGE(0.5)
@@ -162,12 +166,6 @@ static const struct comedi_lrange range_bipolar0_025 = {
 	}
 };
 
-static const struct comedi_lrange *ii20k_ao_ranges[] = {
-	&range_bipolar10,
-	&range_unipolar10,
-	&range_bipolar5,
-};
-
 static const struct comedi_lrange *const ii20k_ai_ranges[] = {
 	&range_bipolar5,
 	&range_bipolar0_5,
@@ -179,7 +177,6 @@ static const int pci20341_timebase[] = { 0x00, 0x00, 0x00, 0x04 };
 static const int pci20341_settling_time[] = { 0x58, 0x58, 0x93, 0x99 };
 
 struct ii20k_ao_private {
-	const struct comedi_lrange *ao_range_list[2];
 	unsigned int last_data[2];
 };
 
@@ -207,10 +204,13 @@ static int ii20k_ao_insn_read(struct comedi_device *dev,
 			      unsigned int *data)
 {
 	struct ii20k_ao_private *ao_spriv = s->private;
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	int i;
 
-	data[0] = ao_spriv->last_data[CR_CHAN(insn->chanspec)];
+	for (i = 0; i < insn->n; i++)
+		data[i] = ao_spriv->last_data[chan];
 
-	return 1;
+	return insn->n;
 }
 
 static int ii20k_ao_insn_write(struct comedi_device *dev,
@@ -220,32 +220,25 @@ static int ii20k_ao_insn_write(struct comedi_device *dev,
 {
 	struct ii20k_ao_private *ao_spriv = s->private;
 	void __iomem *iobase = ii20k_module_iobase(dev, s);
-	int hi, lo;
-	unsigned int boarddata;
+	unsigned int chan = CR_CHAN(insn->chanspec);
+	unsigned int val = ao_spriv->last_data[chan];
+	int i;
 
-	ao_spriv->last_data[CR_CHAN(insn->chanspec)] = data[0];
-	boarddata = (((unsigned int)data[0] + 0x8000) & 0xffff);
-						/* comedi-data -> board-data */
-	lo = (boarddata & 0xff);
-	hi = ((boarddata >> 8) & 0xff);
-
-	switch (CR_CHAN(insn->chanspec)) {
-	case 0:
-		writeb(lo, iobase + PCI20006_LCHAN0);
-		writeb(hi, iobase + PCI20006_LCHAN0 + 1);
-		writeb(0x00, iobase + PCI20006_STROBE0);
-		break;
-	case 1:
-		writeb(lo, iobase + PCI20006_LCHAN1);
-		writeb(hi, iobase + PCI20006_LCHAN1 + 1);
-		writeb(0x00, iobase + PCI20006_STROBE1);
-		break;
-	default:
-		dev_warn(dev->class_dev, "ao channel Error!\n");
-		return -EINVAL;
+	for (i = 0; i < insn->n; i++) {
+		val = data[i];
+
+		/* munge data */
+		val += ((s->maxdata + 1) >> 1);
+		val &= s->maxdata;
+
+		writeb(val & 0xff, iobase + II20K_AO_LSB_REG(chan));
+		writeb((val >> 8) & 0xff, iobase + II20K_AO_MSB_REG(chan));
+		writeb(0x00, iobase + II20K_AO_STRB_REG(chan));
 	}
 
-	return 1;
+	ao_spriv->last_data[chan] = val;
+
+	return insn->n;
 }
 
 static int ii20k_ai_insn_read(struct comedi_device *dev,
@@ -470,30 +463,22 @@ static int ii20k_init_module(struct comedi_device *dev,
 	struct ii20k_ai_private *ai_spriv;
 	void __iomem *iobase = ii20k_module_iobase(dev, s);
 	unsigned int opt0 = it->options[(2 * s->index) + 2];
-	unsigned int opt1 = it->options[(2 * s->index) + 3];
 	unsigned char id;
 
 	id = readb(iobase + II20K_ID_REG);
 	switch (id) {
-	case PCI20006_ID:
-		if (opt0 < 0 || opt0 > 2)
-			opt0 = 0;
-		if (opt1 < 0 || opt1 > 2)
-			opt1 = 0;
-
+	case II20K_ID_PCI20006M_1:
+	case II20K_ID_PCI20006M_2:
 		ao_spriv = comedi_alloc_spriv(s, sizeof(*ao_spriv));
 		if (!ao_spriv)
 			return -ENOMEM;
 
-		ao_spriv->ao_range_list[0] = ii20k_ao_ranges[opt0];
-		ao_spriv->ao_range_list[1] = ii20k_ao_ranges[opt1];
-
 		/* Analog Output subdevice */
 		s->type		= COMEDI_SUBD_AO;
 		s->subdev_flags	= SDF_WRITABLE;
-		s->n_chan	= 2;
+		s->n_chan	= (id == II20K_ID_PCI20006M_2) ? 2 : 1;
 		s->maxdata	= 0xffff;
-		s->range_table_list = ao_spriv->ao_range_list;
+		s->range_table	= &ii20k_ao_ranges;
 		s->insn_read	= ii20k_ao_insn_read;
 		s->insn_write	= ii20k_ao_insn_write;
 		break;