staging: wfx: setup initial chip configuration

A few tasks remain to be done in order to finish chip initial
configuration:
   - configure chip to use multi-tx confirmation (speed up data
     transfer)
   - configure chip to use wake-up feature (save power consumption
     during runtime)
   - set hardware configuration (clocks, RF, pinout, etc...) using a
     Platform Data Set (PDS) file

On release, driver completely shutdown the chip to save power
consumption.

Documentation about PDS and PDS data for sample boards are available
here[1]. One day, PDS data may find a place in device tree but,
currently, PDS is too much linked with firmware to allowing that.

This patch also add "send_pds" file in debugfs to be able to dynamically
change PDS (only for debug, of course).

[1]: https://github.com/SiliconLabs/wfx-firmware/tree/master/PDS

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20190919142527.31797-15-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/staging/wfx/debug.c b/drivers/staging/wfx/debug.c
index f79693a4be7f..0619c7d1cf79 100644
--- a/drivers/staging/wfx/debug.c
+++ b/drivers/staging/wfx/debug.c
@@ -10,6 +10,7 @@
 
 #include "debug.h"
 #include "wfx.h"
+#include "main.h"
 
 #define CREATE_TRACE_POINTS
 #include "traces.h"
@@ -54,6 +55,33 @@ const char *get_reg_name(unsigned long id)
 	return get_symbol(id, wfx_reg_print_map);
 }
 
+static ssize_t wfx_send_pds_write(struct file *file, const char __user *user_buf,
+			     size_t count, loff_t *ppos)
+{
+	struct wfx_dev *wdev = file->private_data;
+	char *buf;
+	int ret;
+
+	if (*ppos != 0) {
+		dev_dbg(wdev->dev, "PDS data must be written in one transaction");
+		return -EBUSY;
+	}
+	buf = memdup_user(user_buf, count);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
+	*ppos = *ppos + count;
+	ret = wfx_send_pds(wdev, buf, count);
+	kfree(buf);
+	if (ret < 0)
+		return ret;
+	return count;
+}
+
+static const struct file_operations wfx_send_pds_fops = {
+	.open = simple_open,
+	.write = wfx_send_pds_write,
+};
+
 static ssize_t wfx_burn_slk_key_write(struct file *file,
 				      const char __user *user_buf,
 				      size_t count, loff_t *ppos)
@@ -162,6 +190,7 @@ int wfx_debug_init(struct wfx_dev *wdev)
 	struct dentry *d;
 
 	d = debugfs_create_dir("wfx", wdev->hw->wiphy->debugfsdir);
+	debugfs_create_file("send_pds", 0200, d, wdev, &wfx_send_pds_fops);
 	debugfs_create_file("burn_slk_key", 0200, d, wdev, &wfx_burn_slk_key_fops);
 	debugfs_create_file("send_hif_msg", 0600, d, wdev, &wfx_send_hif_msg_fops);