From cb0e8454d704be616344b229a030e556c51345bb Mon Sep 17 00:00:00 2001
From: Simon Filgis <simon@ingenieurbuero-filgis.de>
Date: Sun, 14 Apr 2024 11:07:37 +0200
Subject: [PATCH] enable support for multible devices of mcp48xx

Instead of one static dev and priv, allocate a dedicated one each time
the init is invoked.
---
 drivers/analog/mcp48xx.c | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

diff --git a/drivers/analog/mcp48xx.c b/drivers/analog/mcp48xx.c
index 10092984d2..19b0174783 100644
--- a/drivers/analog/mcp48xx.c
+++ b/drivers/analog/mcp48xx.c
@@ -106,8 +106,6 @@ static int  mcp48xx_ioctl(FAR struct dac_dev_s *dev, int cmd,
  * Private Data
  ****************************************************************************/
 
-static struct mcp48xx_dev_s g_devpriv;
-
 static const struct dac_ops_s g_dacops =
 {
   mcp48xx_reset,        /* ao_reset */
@@ -118,12 +116,6 @@ static const struct dac_ops_s g_dacops =
   mcp48xx_ioctl         /* ao_ioctl */
 };
 
-static struct dac_dev_s g_dacdev =
-{
-  &g_dacops,    /* ad_ops */
-  &g_devpriv    /* ad_priv */
-};
-
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -337,15 +329,35 @@ FAR struct dac_dev_s *mcp48xx_initialize(FAR struct spi_dev_s *spi,
                                          uint32_t spidev)
 {
   FAR struct mcp48xx_dev_s *priv;
+  FAR struct dac_dev_s *dacdev;
   int i;
 
   /* Sanity check */
 
   DEBUGASSERT(spi != NULL);
 
+  /* Initialize the DAC device structure */
+
+  priv = kmm_malloc(sizeof(struct mcp48xx_dev_s));
+  if (priv == NULL)
+    {
+      aerr("ERROR: Failed to allocate mcp48xx_dev_s instance\n");
+      free(priv);
+      return NULL;
+    }
+
+  dacdev = kmm_malloc(sizeof(struct dac_dev_s));
+  if (dacdev == NULL)
+    {
+      aerr("ERROR: Failed to allocate dac_dev_s instance\n");
+      return NULL;
+    }
+
+  dacdev->ad_ops = &g_dacops;
+  dacdev->ad_priv = priv;
+
   /* Initialize the MCP48XX device structure */
 
-  priv = (FAR struct mcp48xx_dev_s *)g_dacdev.ad_priv;
   priv->spi = spi;
   priv->spidev = spidev;
 
@@ -356,7 +368,7 @@ FAR struct dac_dev_s *mcp48xx_initialize(FAR struct spi_dev_s *spi,
       priv->cmd[i] = MCP48XX_SHDN | MCP48XX_GA;
     }
 
-  return &g_dacdev;
+  return dacdev;
 }
 
 #endif /* CONFIG_MCP48XX */