[PATCH 3/5] iio: adis: Add adis_update_bits() APIs

Nuno Sá
2020-02-25T12:41:31Z

This patch adds a `regmap_update_bits()` like API to the ADIS library.
It provides locked and unlocked variant.

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
drivers/iio/imu/adis.c | 26 +++++++++++++++
include/linux/iio/imu/adis.h | 61 ++++++++++++++++++++++++++++++++++++
2 files changed, 87 insertions(+)

diff --git a/drivers/iio/imu/adis.c b/drivers/iio/imu/adis.c
index a8afd01de4f3..fa0ee35d96f0 100644
--- a/drivers/iio/imu/adis.c
+++ b/drivers/iio/imu/adis.c
@@ -223,6 +223,32 @@ int __adis_read_reg(struct adis *adis, unsigned int reg,
return ret;
}
EXPORT_SYMBOL_GPL(__adis_read_reg);
+/**
+ * __adis_update_bits_base() - ADIS Update bits function - Unlocked version
+ * @adis: The adis device
+ * @reg: The address of the lower of the two registers
+ * @mask: Bitmask to change
+ * @val: Value to be written
+ * @size: Size of the register to update
+ *
+ * Updates the desired bits of @reg in accordance with @mask and @val.
+ */
+int __adis_update_bits_base(struct adis *adis, unsigned int reg, const u32 mask,
+ const u32 val, u8 size)
+{
+ int ret;
+ u32 __val;
+
+ ret = __adis_read_reg(adis, reg, &__val, size);
+ if (ret)
+ return ret;
+
+ __val &= ~mask;
+ __val |= val & mask;
+
+ return __adis_write_reg(adis, reg, __val, size);
+}
+EXPORT_SYMBOL_GPL(__adis_update_bits_base);

#ifdef CONFIG_DEBUG_FS

diff --git a/include/linux/iio/imu/adis.h b/include/linux/iio/imu/adis.h
index b4c35d137e2a..07073f698718 100644
--- a/include/linux/iio/imu/adis.h
+++ b/include/linux/iio/imu/adis.h
@@ -303,6 +303,67 @@ static inline int adis_read_reg_32(struct adis *adis, unsigned int reg,
return ret;
}

+int __adis_update_bits_base(struct adis *adis, unsigned int reg, const u32 mask,
+ const u32 val, u8 size);
+/**
+ * adis_update_bits_base() - ADIS Update bits function - Locked version
+ * @adis: The adis device
+ * @reg: The address of the lower of the two registers
+ * @mask: Bitmask to change
+ * @val: Value to be written
+ * @size: Size of the register to update
+ *
+ * Updates the desired bits of @reg in accordance with @mask and @val.
+ */
+static inline int adis_update_bits_base(struct adis *adis, unsigned int reg,
+ const u32 mask, const u32 val, u8 size)
+{
+ int ret;
+
+ mutex_lock(&adis->state_lock);
+ ret = __adis_update_bits_base(adis, reg, mask, val, size);
+ mutex_unlock(&adis->state_lock);
+ return ret;
+}
+
+/**
+ * adis_update_bits() - Wrapper macro for adis_update_bits_base - Locked version
+ * @adis: The adis device
+ * @reg: The address of the lower of the two registers
+ * @mask: Bitmask to change
+ * @val: Value to be written
+ *
+ * This macro evaluates the sizeof of @val at compile time and calls
+ * adis_update_bits_base() accordingly. Be aware that using MACROS/DEFINES for
+ * @val can lead to undesired behavior if the register to update is 16bit. Also
+ * note that a 64bit value will be treated as an integer. In the same way,
+ * a char is seen as a short.
+ */
+#define adis_update_bits(adis, reg, mask, val) ({ \
+ __builtin_choose_expr(sizeof(val) == 8 || sizeof(val) == 4, \
+ adis_update_bits_base(adis, reg, mask, val, 4), \
+ adis_update_bits_base(adis, reg, mask, val, 2)); \
+})
+
+/**
+ * adis_update_bits() - Wrapper macro for adis_update_bits_base
+ * @adis: The adis device
+ * @reg: The address of the lower of the two registers
+ * @mask: Bitmask to change
+ * @val: Value to be written
+ *
+ * This macro evaluates the sizeof of @val at compile time and calls
+ * adis_update_bits_base() accordingly. Be aware that using MACROS/DEFINES for
+ * @val can lead to undesired behavior if the register to update is 16bit. Also
+ * note that a 64bit value will be treated as an integer. In the same way,
+ * a char is seen as a short.
+ */
+#define __adis_update_bits(adis, reg, mask, val) ({ \
+ __builtin_choose_expr(sizeof(val) == 8 || sizeof(val) == 4, \
+ __adis_update_bits_base(adis, reg, mask, val, 4), \
+ __adis_update_bits_base(adis, reg, mask, val, 2)); \
+})
+
int adis_enable_irq(struct adis *adis, bool enable);
int __adis_check_status(struct adis *adis);
int __adis_initial_startup(struct adis *adis);
--
2.25.1