1 files changed, 88 insertions, 24 deletions

diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 0f774406fad0..419a38e7c315 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -55,7 +55,7 @@ typedef int (*i2c_slave_cb_t)(struct i2c_client *, enum i2c_slave_event, u8 *);
 struct module;
 struct property_entry;
 
-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+#if IS_ENABLED(CONFIG_I2C)
 /*
  * The master routines are the ones normally used to transmit data to devices
  * on a bus (or read from them). Apart from two basic transfer functions to
@@ -63,10 +63,68 @@ struct property_entry;
  * transmit an arbitrary number of messages without interruption.
  * @count must be be less than 64k since msg.len is u16.
  */
-extern int i2c_master_send(const struct i2c_client *client, const char *buf,
-                           int count);
-extern int i2c_master_recv(const struct i2c_client *client, char *buf,
-                           int count);
+extern int i2c_transfer_buffer_flags(const struct i2c_client *client,
+                                     char *buf, int count, u16 flags);
+
+/**
+ * i2c_master_recv - issue a single I2C message in master receive mode
+ * @client: Handle to slave device
+ * @buf: Where to store data read from slave
+ * @count: How many bytes to read, must be less than 64k since msg.len is u16
+ *
+ * Returns negative errno, or else the number of bytes read.
+ */
+static inline int i2c_master_recv(const struct i2c_client *client,
+                                  char *buf, int count)
+{
+        return i2c_transfer_buffer_flags(client, buf, count, I2C_M_RD);
+};
+
+/**
+ * i2c_master_recv_dmasafe - issue a single I2C message in master receive mode
+ *                           using a DMA safe buffer
+ * @client: Handle to slave device
+ * @buf: Where to store data read from slave, must be safe to use with DMA
+ * @count: How many bytes to read, must be less than 64k since msg.len is u16
+ *
+ * Returns negative errno, or else the number of bytes read.
+ */
+static inline int i2c_master_recv_dmasafe(const struct i2c_client *client,
+                                          char *buf, int count)
+{
+        return i2c_transfer_buffer_flags(client, buf, count,
+                                         I2C_M_RD | I2C_M_DMA_SAFE);
+};
+
+/**
+ * i2c_master_send - issue a single I2C message in master transmit mode
+ * @client: Handle to slave device
+ * @buf: Data that will be written to the slave
+ * @count: How many bytes to write, must be less than 64k since msg.len is u16
+ *
+ * Returns negative errno, or else the number of bytes written.
+ */
+static inline int i2c_master_send(const struct i2c_client *client,
+                                  const char *buf, int count)
+{
+        return i2c_transfer_buffer_flags(client, (char *)buf, count, 0);
+};
+
+/**
+ * i2c_master_send_dmasafe - issue a single I2C message in master transmit mode
+ *                           using a DMA safe buffer
+ * @client: Handle to slave device
+ * @buf: Data that will be written to the slave, must be safe to use with DMA
+ * @count: How many bytes to write, must be less than 64k since msg.len is u16
+ *
+ * Returns negative errno, or else the number of bytes written.
+ */
+static inline int i2c_master_send_dmasafe(const struct i2c_client *client,
+                                          const char *buf, int count)
+{
+        return i2c_transfer_buffer_flags(client, (char *)buf, count,
+                                         I2C_M_DMA_SAFE);
+};
 
 /* Transfer num messages.
  */
@@ -354,7 +412,7 @@ struct i2c_board_info {
         .type = dev_type, .addr = (dev_addr)
 
 
-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+#if IS_ENABLED(CONFIG_I2C)
 /* Add-on boards should register/unregister their devices; e.g. a board
  * with integrated I2C, a config eeprom, sensors, and a codec that's
  * used in conjunction with the primary hardware.
@@ -485,40 +543,43 @@ struct i2c_timings {
 /**
  * struct i2c_bus_recovery_info - I2C bus recovery information
  * @recover_bus: Recover routine. Either pass driver's recover_bus() routine, or
- *      i2c_generic_scl_recovery() or i2c_generic_gpio_recovery().
+ *      i2c_generic_scl_recovery().
  * @get_scl: This gets current value of SCL line. Mandatory for generic SCL
- *      recovery. Used internally for generic GPIO recovery.
- * @set_scl: This sets/clears SCL line. Mandatory for generic SCL recovery. Used
- *      internally for generic GPIO recovery.
+ *      recovery. Populated internally for generic GPIO recovery.
+ * @set_scl: This sets/clears the SCL line. Mandatory for generic SCL recovery.
+ *      Populated internally for generic GPIO recovery.
  * @get_sda: This gets current value of SDA line. Optional for generic SCL
- *      recovery. Used internally, if sda_gpio is a valid GPIO, for generic GPIO
- *      recovery.
+ *      recovery. Populated internally, if sda_gpio is a valid GPIO, for generic
+ *      GPIO recovery.
+ * @set_sda: This sets/clears the SDA line. Optional for generic SCL recovery.
+ *      Populated internally, if sda_gpio is a valid GPIO, for generic GPIO
+ *      recovery.
  * @prepare_recovery: This will be called before starting recovery. Platform may
  *      configure padmux here for SDA/SCL line or something else they want.
  * @unprepare_recovery: This will be called after completing recovery. Platform
  *      may configure padmux here for SDA/SCL line or something else they want.
- * @scl_gpio: gpio number of the SCL line. Only required for GPIO recovery.
- * @sda_gpio: gpio number of the SDA line. Only required for GPIO recovery.
+ * @scl_gpiod: gpiod of the SCL line. Only required for GPIO recovery.
+ * @sda_gpiod: gpiod of the SDA line. Only required for GPIO recovery.
  */
 struct i2c_bus_recovery_info {
-        int (*recover_bus)(struct i2c_adapter *);
+        int (*recover_bus)(struct i2c_adapter *adap);
 
-        int (*get_scl)(struct i2c_adapter *);
-        void (*set_scl)(struct i2c_adapter *, int val);
-        int (*get_sda)(struct i2c_adapter *);
+        int (*get_scl)(struct i2c_adapter *adap);
+        void (*set_scl)(struct i2c_adapter *adap, int val);
+        int (*get_sda)(struct i2c_adapter *adap);
+        void (*set_sda)(struct i2c_adapter *adap, int val);
 
-        void (*prepare_recovery)(struct i2c_adapter *);
-        void (*unprepare_recovery)(struct i2c_adapter *);
+        void (*prepare_recovery)(struct i2c_adapter *adap);
+        void (*unprepare_recovery)(struct i2c_adapter *adap);
 
         /* gpio recovery */
-        int scl_gpio;
-        int sda_gpio;
+        struct gpio_desc *scl_gpiod;
+        struct gpio_desc *sda_gpiod;
 };
 
 int i2c_recover_bus(struct i2c_adapter *adap);
 
 /* Generic recovery routines */
-int i2c_generic_gpio_recovery(struct i2c_adapter *adap);
 int i2c_generic_scl_recovery(struct i2c_adapter *adap);
 
 /**
@@ -706,7 +767,7 @@ i2c_unlock_adapter(struct i2c_adapter *adapter)
 
 /* administration...
  */
-#if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
+#if IS_ENABLED(CONFIG_I2C)
 extern int i2c_add_adapter(struct i2c_adapter *);
 extern void i2c_del_adapter(struct i2c_adapter *);
 extern int i2c_add_numbered_adapter(struct i2c_adapter *);
@@ -769,6 +830,9 @@ static inline u8 i2c_8bit_addr_from_msg(const struct i2c_msg *msg)
         return (msg->addr << 1) | (msg->flags & I2C_M_RD ? 1 : 0);
 }
 
+u8 *i2c_get_dma_safe_msg_buf(struct i2c_msg *msg, unsigned int threshold);
+void i2c_release_dma_safe_msg_buf(struct i2c_msg *msg, u8 *buf);
+
 int i2c_handle_smbus_host_notify(struct i2c_adapter *adap, unsigned short addr);
 /**
  * module_i2c_driver() - Helper macro for registering a modular I2C driver