staging: comedi: s626: remove my_latch_lsw from encoder private data

This member of the encoder private data can be calculated based on
the comedi channel stored in the 'chan' member of the private data.
Do that instead and remove the unnecessary member.
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>

drivers/staging/comedi/drivers/s626.c

@@ -139,8 +139,6 @@ struct s626_enc_info {
 	void (*reset_cap_flags)(struct comedi_device *dev,
 				const struct s626_enc_info *k);
 
-	uint16_t my_latch_lsw;	/* address of Latch least-significant-word
-				 * register */
 	uint16_t my_event_bits[4]; /* bit translations for IntSrc -->RDMISC2 */
 };
 
@@ -731,10 +729,11 @@ static uint32_t s626_read_latch(struct comedi_device *dev,
 	uint32_t value;
 
 	/* Latch counts and fetch LSW of latched counts value. */
-	value = s626_debi_read(dev, k->my_latch_lsw);
+	value = s626_debi_read(dev, S626_LP_CNTR(k->chan));
 
 	/* Fetch MSW of latched counts and combine with LSW. */
-	value |= ((uint32_t)s626_debi_read(dev, k->my_latch_lsw + 2) << 16);
+	value |= ((uint32_t)s626_debi_read(dev,
+					   S626_LP_CNTR(k->chan) + 2) << 16);
 
 	/* Return latched counts. */
 	return value;
@@ -759,8 +758,8 @@ static void s626_set_latch_source(struct comedi_device *dev,
 static void s626_preload(struct comedi_device *dev,
 			 const struct s626_enc_info *k, uint32_t value)
 {
-	s626_debi_write(dev, k->my_latch_lsw, value);
-	s626_debi_write(dev, k->my_latch_lsw + 2, value >> 16);
+	s626_debi_write(dev, S626_LP_CNTR(k->chan), value);
+	s626_debi_write(dev, S626_LP_CNTR(k->chan) + 2, value >> 16);
 }
 
 /* ******  PRIVATE COUNTER FUNCTIONS ****** */
@@ -1334,7 +1333,6 @@ static const struct s626_enc_info s626_enc_chan_info[] = {
 		.set_load_trig		= s626_set_load_trig_a,
 		.set_mode		= s626_set_mode_a,
 		.reset_cap_flags	= s626_reset_cap_flags_a,
-		.my_latch_lsw		= S626_LP_CNTR(0),
 		.my_event_bits		= S626_EVBITS(0),
 	}, {
 		.chan			= 1,
@@ -1348,7 +1346,6 @@ static const struct s626_enc_info s626_enc_chan_info[] = {
 		.set_load_trig		= s626_set_load_trig_a,
 		.set_mode		= s626_set_mode_a,
 		.reset_cap_flags	= s626_reset_cap_flags_a,
-		.my_latch_lsw		= S626_LP_CNTR(1),
 		.my_event_bits		= S626_EVBITS(1),
 	}, {
 		.chan			= 2,
@@ -1362,7 +1359,6 @@ static const struct s626_enc_info s626_enc_chan_info[] = {
 		.set_load_trig		= s626_set_load_trig_a,
 		.set_mode		= s626_set_mode_a,
 		.reset_cap_flags	= s626_reset_cap_flags_a,
-		.my_latch_lsw		= S626_LP_CNTR(2),
 		.my_event_bits		= S626_EVBITS(2),
 	}, {
 		.chan			= 3,
@@ -1376,7 +1372,6 @@ static const struct s626_enc_info s626_enc_chan_info[] = {
 		.set_load_trig		= s626_set_load_trig_b,
 		.set_mode		= s626_set_mode_b,
 		.reset_cap_flags	= s626_reset_cap_flags_b,
-		.my_latch_lsw		= S626_LP_CNTR(3),
 		.my_event_bits		= S626_EVBITS(3),
 	}, {
 		.chan			= 4,
@@ -1390,7 +1385,6 @@ static const struct s626_enc_info s626_enc_chan_info[] = {
 		.set_load_trig		= s626_set_load_trig_b,
 		.set_mode		= s626_set_mode_b,
 		.reset_cap_flags	= s626_reset_cap_flags_b,
-		.my_latch_lsw		= S626_LP_CNTR(4),
 		.my_event_bits		= S626_EVBITS(4),
 	}, {
 		.chan			= 5,
@@ -1404,7 +1398,6 @@ static const struct s626_enc_info s626_enc_chan_info[] = {
 		.set_load_trig		= s626_set_load_trig_b,
 		.set_mode		= s626_set_mode_b,
 		.reset_cap_flags	= s626_reset_cap_flags_b,
-		.my_latch_lsw		= S626_LP_CNTR(5),
 		.my_event_bits		= S626_EVBITS(5),
 	},
 };