[PATCH 09/10] dfu: add error callback

[Patrick Delaunay]

Add error callback in dfu stack to manage some board specific
behavior on DFU targets.

Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
---

 drivers/dfu/dfu.c | 12 ++++++++++++
 include/dfu.h     | 11 +++++++++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/dfu/dfu.c b/drivers/dfu/dfu.c
index 213a20e7bc..ff1859d946 100644
--- a/drivers/dfu/dfu.c
+++ b/drivers/dfu/dfu.c
@@ -44,6 +44,14 @@ __weak void dfu_initiated_callback(struct dfu_entity *dfu)
 {
 }
 
+/*
+ * The purpose of the dfu_error_callback() function is to
+ * provide callback for dfu user
+ */
+__weak void dfu_error_callback(struct dfu_entity *dfu, const char *msg)
+{
+}
+
 /*
  * The purpose of the dfu_usb_get_reset() function is to
  * provide information if after USB_DETACH request
@@ -342,6 +350,7 @@ int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 		printf("%s: Wrong sequence number! [%d] [%d]\n",
 		       __func__, dfu->i_blk_seq_num, blk_seq_num);
 		dfu_transaction_cleanup(dfu);
+		dfu_error_callback(dfu, "Wrong sequence number");
 		return -1;
 	}
 
@@ -366,6 +375,7 @@ int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 		ret = dfu_write_buffer_drain(dfu);
 		if (ret) {
 			dfu_transaction_cleanup(dfu);
+			dfu_error_callback(dfu, "DFU write error");
 			return ret;
 		}
 	}
@@ -375,6 +385,7 @@ int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 		pr_err("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
 		      size, dfu->i_buf_end);
 		dfu_transaction_cleanup(dfu);
+		dfu_error_callback(dfu, "Buffer overflow");
 		return -1;
 	}
 
@@ -386,6 +397,7 @@ int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
 		ret = dfu_write_buffer_drain(dfu);
 		if (ret) {
 			dfu_transaction_cleanup(dfu);
+			dfu_error_callback(dfu, "DFU write error");
 			return ret;
 		}
 	}
diff --git a/include/dfu.h b/include/dfu.h
index d18b701728..1963e9ffb9 100644
--- a/include/dfu.h
+++ b/include/dfu.h
@@ -383,6 +383,17 @@ void dfu_initiated_callback(struct dfu_entity *dfu);
  */
 void dfu_flush_callback(struct dfu_entity *dfu);
 
+/**
+ * dfu_error_callback() - weak callback called at the DFU write error
+ *
+ * It is a callback function called by DFU stack after DFU write error.
+ * This function allows to manage some board specific behavior on DFU targets
+ *
+ * @dfu:	pointer to the dfu_entity which cause the error
+ * @msg:	the message of the error
+ */
+void dfu_error_callback(struct dfu_entity *dfu, const char *msg);
+
 int dfu_transaction_initiate(struct dfu_entity *dfu, bool read);
 void dfu_transaction_cleanup(struct dfu_entity *dfu);
 
-- 
2.17.1