NFC Digital: Implement driver commands mechanism

This implements the mechanism used to send commands to the driver in
initiator mode through in_send_cmd().

Commands are serialized and sent to the driver by using a work item
on the system workqueue. Responses are handled asynchronously by
another work item. Once the digital stack receives the response through
the command_complete callback, the next command is sent to the driver.

This also implements the polling mechanism. It's handled by a work item
cycling on all supported protocols. The start poll command for a given
protocol is sent to the driver using the mechanism described above.
The process continues until a peer is discovered or stop_poll is
called. This patch implements the poll function for NFC-A that sends a
SENS_REQ command and waits for the SENS_RES response.

Signed-off-by: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/include/net/nfc/digital.h b/include/net/nfc/digital.h
index 8e16b6e0265a..aabd89400d23 100644
--- a/include/net/nfc/digital.h
+++ b/include/net/nfc/digital.h
@@ -146,6 +146,15 @@ struct nfc_digital_ops {
         void (*abort_cmd)(struct nfc_digital_dev *ddev);
 };
 
+#define NFC_DIGITAL_POLL_MODE_COUNT_MAX 6 /* 106A, 212F, and 424F in & tg */
+
+typedef int (*digital_poll_t)(struct nfc_digital_dev *ddev, u8 rf_tech);
+
+struct digital_poll_tech {
+        u8 rf_tech;
+        digital_poll_t poll_func;
+};
+
 /**
  * Driver capabilities - bit mask made of the following values
  *
@@ -168,6 +177,22 @@ struct nfc_digital_dev {
 
         u32 driver_capabilities;
         void *driver_data;
+
+        struct digital_poll_tech poll_techs[NFC_DIGITAL_POLL_MODE_COUNT_MAX];
+        u8 poll_tech_count;
+        u8 poll_tech_index;
+        struct mutex poll_lock;
+
+        struct work_struct cmd_work;
+        struct work_struct cmd_complete_work;
+        struct list_head cmd_queue;
+        struct mutex cmd_lock;
+
+        struct work_struct poll_work;
+
+        u8 curr_protocol;
+        u8 curr_rf_tech;
+        u8 curr_nfc_dep_pni;
 };
 
 struct nfc_digital_dev *nfc_digital_allocate_device(struct nfc_digital_ops *ops,