drivers/modem/alt1250: Update alt1250 driver

Updated alt1250 driver with regarding to the following changes.
- Add LTE hibernation feature
- Split source code per module
- Some refactoring
- Some bug fixes

boards/arm/cxd56xx/common/src/cxd56_alt1250.c

@@ -38,6 +38,7 @@
 
 #include <arch/board/board.h>
 #include <arch/board/cxd56_alt1250.h>
+#include <arch/chip/pm.h>
 
 #include "cxd56_spi.h"
 #include "cxd56_dmac.h"
@@ -79,6 +80,8 @@
 
 static struct spi_dev_s *alt1250_poweron(void);
 static void alt1250_poweroff(void);
+static bool alt1250_powerstatus(void);
+static int  alt1250_hibernation_mode(bool enable);
 static void alt1250_reset(void);
 static void alt1250_irqattach(xcpt_t handler);
 static void alt1250_irqenable(bool enable);
@@ -95,6 +98,8 @@ static const struct alt1250_lower_s g_alt1250_lower =
 {
   .poweron      = alt1250_poweron,
   .poweroff     = alt1250_poweroff,
+  .powerstatus  = alt1250_powerstatus,
+  .hiber_mode   = alt1250_hibernation_mode,
   .reset        = alt1250_reset,
   .irqattach    = alt1250_irqattach,
   .irqenable    = alt1250_irqenable,
@@ -292,6 +297,43 @@ static void alt1250_poweroff(void)
   board_alt1250_poweroff();
 }
 
+/****************************************************************************
+ * Name: alt1250_powerstatus
+ *
+ * Description:
+ *   Get the power status for the Altair modem device on the board.
+ *
+ ****************************************************************************/
+
+static bool alt1250_powerstatus(void)
+{
+  return board_alt1250_powerstatus();
+}
+
+/****************************************************************************
+ * Name: alt1250_hibernation_mode
+ *
+ * Description:
+ *   Set power manager for entering hibernation mode.
+ *
+ ****************************************************************************/
+
+static int alt1250_hibernation_mode(bool enable)
+{
+  uint32_t bootmask = 0;
+
+  if (enable)
+    {
+      /* Set GPIO interrupt for wake-up */
+
+      bootmask = up_pm_get_bootmask();
+      bootmask |= PM_BOOT_COLD_GPIO;
+      up_pm_set_bootmask(bootmask);
+    }
+
+  return board_alt1250_powerkeep(enable);
+}
+
 /****************************************************************************
  * Name: alt1250_reset
  *

boards/arm/cxd56xx/spresense/include/cxd56_alt1250.h

@@ -56,7 +56,7 @@ extern "C"
  *
  ****************************************************************************/
 
-int board_alt1250_initialize(const char *devpath);
+int board_alt1250_initialize(FAR const char *devpath);
 
 /****************************************************************************
  * Name: board_alt1250_uninitialize
@@ -88,6 +88,26 @@ void board_alt1250_poweron(void);
 
 void board_alt1250_poweroff(void);
 
+/****************************************************************************
+ * Name: board_alt1250_powerstatus
+ *
+ * Description:
+ *   Get the power status for the Altair modem device on the board.
+ *
+ ****************************************************************************/
+
+bool board_alt1250_powerstatus(void);
+
+/****************************************************************************
+ * Name: board_alt1250_powerkeep
+ *
+ * Description:
+ *   Set Modem power keep mode when turning off the board.
+ *
+ ****************************************************************************/
+
+int board_alt1250_powerkeep(bool enable);
+
 /****************************************************************************
  * Name: board_alt1250_reset
  *

boards/arm/cxd56xx/spresense/src/cxd56_alt1250_power.c

@@ -65,14 +65,6 @@ static sem_t g_wd_wait;
 
 void board_alt1250_poweron(void)
 {
-  /* Power on altair modem device */
-
-  cxd56_gpio_config(ALT1250_LTE_POWER_BUTTON, false);
-  cxd56_gpio_write(ALT1250_LTE_POWER_BUTTON, false);
-
-  cxd56_gpio_config(ALT1250_SHUTDOWN, false);
-  cxd56_gpio_write(ALT1250_SHUTDOWN, true);
-
   board_power_control(POWER_LTE, true);
 }
 
@@ -86,12 +78,40 @@ void board_alt1250_poweron(void)
 
 void board_alt1250_poweroff(void)
 {
-  /* Power off Altair modem device */
-
   board_power_control(POWER_LTE, false);
+}
 
-  cxd56_gpio_write(ALT1250_SHUTDOWN, false);
-  cxd56_gpio_write(ALT1250_LTE_POWER_BUTTON, false);
+/****************************************************************************
+ * Name: board_alt1250_powerstatus
+ *
+ * Description:
+ *   Get the power status for the Altair modem device on the board.
+ *
+ ****************************************************************************/
+
+bool board_alt1250_powerstatus(void)
+{
+  return board_power_monitor(POWER_LTE);
+}
+
+/****************************************************************************
+ * Name: board_alt1250_powerkeep
+ *
+ * Description:
+ *   Set Modem power keep mode when turning off the board.
+ *
+ ****************************************************************************/
+
+int board_alt1250_powerkeep(bool enable)
+{
+  if (enable)
+    {
+      return board_unset_reset_gpo(POWER_LTE);
+    }
+  else
+    {
+      return board_set_reset_gpo(POWER_LTE);
+    }
 }
 
 /****************************************************************************
@@ -124,7 +144,7 @@ void board_alt1250_reset(void)
 
   /* Reset Altair modem device */
 
-  cxd56_gpio_write(ALT1250_SHUTDOWN, false);
+  board_alt1250_poweroff();
 
   /* ALT1250_SHUTDOWN should be low in the range 101usec to 100msec */
 
@@ -135,7 +155,7 @@ void board_alt1250_reset(void)
 
   nxsem_wait_uninterruptible(&g_wd_wait);
 
-  cxd56_gpio_write(ALT1250_SHUTDOWN, true);
+  board_alt1250_poweron();
 
   nxsem_destroy(&g_wd_wait);
 }