[PATCH -next v2] spi: introduce new helpers with using modern naming

[Yang Yingliang <yangyingliang@huawei.com>]

For using modern names host/target to instead of all the legacy names,
I think it takes 3 steps:
  - step1: introduce new helpers with modern naming.
  - step2: switch to use these new helpers in all drivers.
  - step3: remove all legacy helpers and update all legacy names.

This patch is for step1, it introduces new helpers with host/target
naming for drivers using.

Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
v1 -> v2:
  make 'target' member into union to initialize it.
---
 drivers/spi/spi.c       | 11 ++++++++++
 include/linux/spi/spi.h | 47 +++++++++++++++++++++++++++++++++++++++--
 2 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 5f9aedd1f0b6..04b5668a1866 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2759,6 +2759,17 @@ int spi_slave_abort(struct spi_device *spi)
 }
 EXPORT_SYMBOL_GPL(spi_slave_abort);
 
+int spi_target_abort(struct spi_device *spi)
+{
+	struct spi_controller *ctlr = spi->controller;
+
+	if (spi_controller_is_target(ctlr) && ctlr->target_abort)
+		return ctlr->target_abort(ctlr);
+
+	return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(spi_target_abort);
+
 static ssize_t slave_show(struct device *dev, struct device_attribute *attr,
 			  char *buf)
 {
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index fbf8c0d95968..130d5b5e3147 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -356,6 +356,7 @@ extern struct spi_device *spi_new_ancillary_device(struct spi_device *spi, u8 ch
  * @max_speed_hz: Highest supported transfer speed
  * @flags: other constraints relevant to this driver
  * @slave: indicates that this is an SPI slave controller
+ * @target: indicates that this is an SPI target controller
  * @devm_allocated: whether the allocation of this struct is devres-managed
  * @max_transfer_size: function that returns the max transfer size for
  *	a &spi_device; may be %NULL, so the default %SIZE_MAX will be used.
@@ -440,6 +441,7 @@ extern struct spi_device *spi_new_ancillary_device(struct spi_device *spi, u8 ch
  * @mem_caps: controller capabilities for the handling of memory operations.
  * @unprepare_message: undo any work done by prepare_message().
  * @slave_abort: abort the ongoing transfer request on an SPI slave controller
+ * @target_abort: abort the ongoing transfer request on an SPI target controller
  * @cs_gpiods: Array of GPIO descs to use as chip select lines; one per CS
  *	number. Any individual value may be NULL for CS lines that
  *	are not GPIOs (driven by the SPI controller itself).
@@ -535,8 +537,12 @@ struct spi_controller {
 	/* Flag indicating if the allocation of this struct is devres-managed */
 	bool			devm_allocated;
 
-	/* Flag indicating this is an SPI slave controller */
-	bool			slave;
+	union {
+		/* Flag indicating this is an SPI slave controller */
+		bool			slave;
+		/* Flag indicating this is an SPI target controller */
+		bool			target;
+	};
 
 	/*
 	 * on some hardware transfer / message size may be constrained
@@ -650,6 +656,7 @@ struct spi_controller {
 	int (*unprepare_message)(struct spi_controller *ctlr,
 				 struct spi_message *message);
 	int (*slave_abort)(struct spi_controller *ctlr);
+	int (*target_abort)(struct spi_controller *ctlr);
 
 	/*
 	 * These hooks are for drivers that use a generic implementation
@@ -727,6 +734,11 @@ static inline bool spi_controller_is_slave(struct spi_controller *ctlr)
 	return IS_ENABLED(CONFIG_SPI_SLAVE) && ctlr->slave;
 }
 
+static inline bool spi_controller_is_target(struct spi_controller *ctlr)
+{
+	return IS_ENABLED(CONFIG_SPI_SLAVE) && ctlr->target;
+}
+
 /* PM calls that need to be issued by the driver */
 extern int spi_controller_suspend(struct spi_controller *ctlr);
 extern int spi_controller_resume(struct spi_controller *ctlr);
@@ -763,6 +775,21 @@ static inline struct spi_controller *spi_alloc_slave(struct device *host,
 	return __spi_alloc_controller(host, size, true);
 }
 
+static inline struct spi_controller *spi_alloc_host(struct device *dev,
+						    unsigned int size)
+{
+	return __spi_alloc_controller(dev, size, false);
+}
+
+static inline struct spi_controller *spi_alloc_target(struct device *dev,
+						      unsigned int size)
+{
+	if (!IS_ENABLED(CONFIG_SPI_SLAVE))
+		return NULL;
+
+	return __spi_alloc_controller(dev, size, true);
+}
+
 struct spi_controller *__devm_spi_alloc_controller(struct device *dev,
 						   unsigned int size,
 						   bool slave);
@@ -782,6 +809,21 @@ static inline struct spi_controller *devm_spi_alloc_slave(struct device *dev,
 	return __devm_spi_alloc_controller(dev, size, true);
 }
 
+static inline struct spi_controller *devm_spi_alloc_host(struct device *dev,
+							 unsigned int size)
+{
+	return __devm_spi_alloc_controller(dev, size, false);
+}
+
+static inline struct spi_controller *devm_spi_alloc_target(struct device *dev,
+							   unsigned int size)
+{
+	if (!IS_ENABLED(CONFIG_SPI_SLAVE))
+		return NULL;
+
+	return __devm_spi_alloc_controller(dev, size, true);
+}
+
 extern int spi_register_controller(struct spi_controller *ctlr);
 extern int devm_spi_register_controller(struct device *dev,
 					struct spi_controller *ctlr);
@@ -1141,6 +1183,7 @@ static inline void spi_message_free(struct spi_message *m)
 extern int spi_setup(struct spi_device *spi);
 extern int spi_async(struct spi_device *spi, struct spi_message *message);
 extern int spi_slave_abort(struct spi_device *spi);
+extern int spi_target_abort(struct spi_device *spi);
 
 static inline size_t
 spi_max_message_size(struct spi_device *spi)
-- 
2.25.1