include/linux/soc/qcom/smd.h

   1 #ifndef __QCOM_SMD_H__
   2 #define __QCOM_SMD_H__
   3
   4 #include <linux/device.h>
   5 #include <linux/mod_devicetable.h>
   6
   7 struct qcom_smd;
   8 struct qcom_smd_channel;
   9 struct qcom_smd_lookup;
  10
  11 /**
  12  * struct qcom_smd_id - struct used for matching a smd device
  13  * @name:       name of the channel
  14  */
  15 struct qcom_smd_id {
  16         char name[20];
  17 };
  18
  19 /**
  20  * struct qcom_smd_device - smd device struct
  21  * @dev:        the device struct
  22  * @channel:    handle to the smd channel for this device
  23  */
  24 struct qcom_smd_device {
  25         struct device dev;
  26         struct qcom_smd_channel *channel;
  27 };
  28
  29 /**
  30  * struct qcom_smd_driver - smd driver struct
  31  * @driver:     underlying device driver
  32  * @smd_match_table: static channel match table
  33  * @probe:      invoked when the smd channel is found
  34  * @remove:     invoked when the smd channel is closed
  35  * @callback:   invoked when an inbound message is received on the channel,
  36  *              should return 0 on success or -EBUSY if the data cannot be
  37  *              consumed at this time
  38  */
  39 struct qcom_smd_driver {
  40         struct device_driver driver;
  41         const struct qcom_smd_id *smd_match_table;
  42
  43         int (*probe)(struct qcom_smd_device *dev);
  44         void (*remove)(struct qcom_smd_device *dev);
  45         int (*callback)(struct qcom_smd_device *, const void *, size_t);
  46 };
  47
  48 #if IS_ENABLED(CONFIG_QCOM_SMD)
  49
  50 int qcom_smd_driver_register(struct qcom_smd_driver *drv);
  51 void qcom_smd_driver_unregister(struct qcom_smd_driver *drv);
  52
  53 int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len);
  54
  55 #else
  56
  57 static inline int qcom_smd_driver_register(struct qcom_smd_driver *drv)
  58 {
  59         return -ENXIO;
  60 }
  61
  62 static inline void qcom_smd_driver_unregister(struct qcom_smd_driver *drv)
  63 {
  64         /* This shouldn't be possible */
  65         WARN_ON(1);
  66 }
  67
  68 static inline int qcom_smd_send(struct qcom_smd_channel *channel,
  69                                 const void *data, int len)
  70 {
  71         /* This shouldn't be possible */
  72         WARN_ON(1);
  73         return -ENXIO;
  74 }
  75
  76 #endif
  77
  78 #define module_qcom_smd_driver(__smd_driver) \
  79         module_driver(__smd_driver, qcom_smd_driver_register, \
  80                       qcom_smd_driver_unregister)
  81
  82
  83 #endif