linux-kernel - [PATCH] IIO: stm32: Remove quadrature related functions from trigger driver

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Date:   Tue, 7 May 2019 11:12:24 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...com>
To:     <jic23@...nel.org>, <knaack.h@....de>, <lars@...afoo.de>,
        <pmeerw@...erw.net>, <fabrice.gasnier@...com>,
        <vilhelm.gray@...il.com>
CC:     <alexandre.torgue@...com>, <linux-iio@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: [PATCH] IIO: stm32: Remove quadrature related functions from trigger driver

Quadrature feature is now hosted on it own framework.
Remove quadrature related code from stm32-trigger driver to avoid
code duplication and simplify the ABI.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
---
 .../ABI/testing/sysfs-bus-iio-timer-stm32          | 23 ------
 drivers/iio/trigger/stm32-timer-trigger.c          | 84 ----------------------
 2 files changed, 107 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
index 161c147d3c40..b7259234ad70 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
+++ b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
@@ -91,29 +91,6 @@ Description:
 		When counting down the counter start from preset value
 		and fire event when reach 0.
 
-What:		/sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available
-KernelVersion:	4.12
-Contact:	benjamin.gaignard@...com
-Description:
-		Reading returns the list possible quadrature modes.
-
-What:		/sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode
-KernelVersion:	4.12
-Contact:	benjamin.gaignard@...com
-Description:
-		Configure the device counter quadrature modes:
-		channel_A:
-			Encoder A input servers as the count input and B as
-			the UP/DOWN direction control input.
-
-		channel_B:
-			Encoder B input serves as the count input and A as
-			the UP/DOWN direction control input.
-
-		quadrature:
-			Encoder A and B inputs are mixed to get direction
-			and count with a scale of 0.25.
-
 What:		/sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available
 KernelVersion:	4.12
 Contact:	benjamin.gaignard@...com
diff --git a/drivers/iio/trigger/stm32-timer-trigger.c b/drivers/iio/trigger/stm32-timer-trigger.c
index ccf1ce653b25..a5dfe65cd9b9 100644
--- a/drivers/iio/trigger/stm32-timer-trigger.c
+++ b/drivers/iio/trigger/stm32-timer-trigger.c
@@ -608,86 +608,6 @@ static const struct iio_enum stm32_enable_mode_enum = {
 	.get = stm32_get_enable_mode
 };
 
-static const char *const stm32_quadrature_modes[] = {
-	"channel_A",
-	"channel_B",
-	"quadrature",
-};
-
-static int stm32_set_quadrature_mode(struct iio_dev *indio_dev,
-				     const struct iio_chan_spec *chan,
-				     unsigned int mode)
-{
-	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
-
-	regmap_update_bits(priv->regmap, TIM_SMCR, TIM_SMCR_SMS, mode + 1);
-
-	return 0;
-}
-
-static int stm32_get_quadrature_mode(struct iio_dev *indio_dev,
-				     const struct iio_chan_spec *chan)
-{
-	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
-	u32 smcr;
-	int mode;
-
-	regmap_read(priv->regmap, TIM_SMCR, &smcr);
-	mode = (smcr & TIM_SMCR_SMS) - 1;
-	if ((mode < 0) || (mode > ARRAY_SIZE(stm32_quadrature_modes)))
-		return -EINVAL;
-
-	return mode;
-}
-
-static const struct iio_enum stm32_quadrature_mode_enum = {
-	.items = stm32_quadrature_modes,
-	.num_items = ARRAY_SIZE(stm32_quadrature_modes),
-	.set = stm32_set_quadrature_mode,
-	.get = stm32_get_quadrature_mode
-};
-
-static const char *const stm32_count_direction_states[] = {
-	"up",
-	"down"
-};
-
-static int stm32_set_count_direction(struct iio_dev *indio_dev,
-				     const struct iio_chan_spec *chan,
-				     unsigned int dir)
-{
-	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
-	u32 val;
-	int mode;
-
-	/* In encoder mode, direction is RO (given by TI1/TI2 signals) */
-	regmap_read(priv->regmap, TIM_SMCR, &val);
-	mode = (val & TIM_SMCR_SMS) - 1;
-	if ((mode >= 0) || (mode < ARRAY_SIZE(stm32_quadrature_modes)))
-		return -EBUSY;
-
-	return regmap_update_bits(priv->regmap, TIM_CR1, TIM_CR1_DIR,
-				  dir ? TIM_CR1_DIR : 0);
-}
-
-static int stm32_get_count_direction(struct iio_dev *indio_dev,
-				     const struct iio_chan_spec *chan)
-{
-	struct stm32_timer_trigger *priv = iio_priv(indio_dev);
-	u32 cr1;
-
-	regmap_read(priv->regmap, TIM_CR1, &cr1);
-
-	return ((cr1 & TIM_CR1_DIR) ? 1 : 0);
-}
-
-static const struct iio_enum stm32_count_direction_enum = {
-	.items = stm32_count_direction_states,
-	.num_items = ARRAY_SIZE(stm32_count_direction_states),
-	.set = stm32_set_count_direction,
-	.get = stm32_get_count_direction
-};
-
 static ssize_t stm32_count_get_preset(struct iio_dev *indio_dev,
 				      uintptr_t private,
 				      const struct iio_chan_spec *chan,
@@ -728,10 +648,6 @@ static const struct iio_chan_spec_ext_info stm32_trigger_count_info[] = {
 		.read = stm32_count_get_preset,
 		.write = stm32_count_set_preset
 	},
-	IIO_ENUM("count_direction", IIO_SEPARATE, &stm32_count_direction_enum),
-	IIO_ENUM_AVAILABLE("count_direction", &stm32_count_direction_enum),
-	IIO_ENUM("quadrature_mode", IIO_SEPARATE, &stm32_quadrature_mode_enum),
-	IIO_ENUM_AVAILABLE("quadrature_mode", &stm32_quadrature_mode_enum),
 	IIO_ENUM("enable_mode", IIO_SEPARATE, &stm32_enable_mode_enum),
 	IIO_ENUM_AVAILABLE("enable_mode", &stm32_enable_mode_enum),
 	IIO_ENUM("trigger_mode", IIO_SEPARATE, &stm32_trigger_mode_enum),
-- 
2.15.0