i2c-parport: Add SMBus alert support

Add support for the SMBus alert mechanism to the i2c-parport driver.
The ADM1032 evaluation board at least is properly wired for this.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Trent Piepho <tpiepho@freescale.com>

4 files changed, 42 insertions, 3 deletions

diff --git a/Documentation/i2c/busses/i2c-parport b/Documentation/i2c/busses/i2c-parport
index dceaba1ad930..2461c7b53b2c 100644
--- a/Documentation/i2c/busses/i2c-parport
+++ b/Documentation/i2c/busses/i2c-parport
@@ -29,6 +29,9 @@ can be easily added when needed.
 Earlier kernels defaulted to type=0 (Philips).  But now, if the type
 parameter is missing, the driver will simply fail to initialize.
 
+SMBus alert support is available on adapters which have this line properly
+connected to the parallel port's interrupt pin.
+
 
 Building your own adapter
 -------------------------
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 7c382f9d81c3..4d65546ede44 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -581,6 +581,7 @@ config I2C_PARPORT
         tristate "Parallel port adapter"
         depends on PARPORT
         select I2C_ALGOBIT
+        select I2C_SMBUS
         help
           This supports parallel port I2C adapters such as the ones made by
           Philips or Velleman, Analog Devices evaluation boards, and more.
diff --git a/drivers/i2c/busses/i2c-parport.c b/drivers/i2c/busses/i2c-parport.c
index 056af1820993..220fca7f23a6 100644
--- a/drivers/i2c/busses/i2c-parport.c
+++ b/drivers/i2c/busses/i2c-parport.c
@@ -1,7 +1,7 @@
 /* ------------------------------------------------------------------------ *
  * i2c-parport.c I2C bus over parallel port                                 *
  * ------------------------------------------------------------------------ *
-   Copyright (C) 2003-2007 Jean Delvare <khali@linux-fr.org>
+   Copyright (C) 2003-2010 Jean Delvare <khali@linux-fr.org>
    
    Based on older i2c-philips-par.c driver
    Copyright (C) 1995-2000 Simon G. Vogl
@@ -31,6 +31,7 @@
 #include <linux/parport.h>
 #include <linux/i2c.h>
 #include <linux/i2c-algo-bit.h>
+#include <linux/i2c-smbus.h>
 #include "i2c-parport.h"
 
 /* ----- Device list ------------------------------------------------------ */
@@ -39,6 +40,8 @@ struct i2c_par {
         struct pardevice *pdev;
         struct i2c_adapter adapter;
         struct i2c_algo_bit_data algo_data;
+        struct i2c_smbus_alert_setup alert_data;
+        struct i2c_client *ara;
         struct i2c_par *next;
 };
 
@@ -144,6 +147,19 @@ static struct i2c_algo_bit_data parport_algo_data = {
 
 /* ----- I2c and parallel port call-back functions and structures --------- */
 
+void i2c_parport_irq(void *data)
+{
+        struct i2c_par *adapter = data;
+        struct i2c_client *ara = adapter->ara;
+
+        if (ara) {
+                dev_dbg(&ara->dev, "SMBus alert received\n");
+                i2c_handle_smbus_alert(ara);
+        } else
+                dev_dbg(&adapter->adapter.dev,
+                        "SMBus alert received but no ARA client!\n");
+}
+
 static void i2c_parport_attach (struct parport *port)
 {
         struct i2c_par *adapter;
@@ -155,8 +171,9 @@ static void i2c_parport_attach (struct parport *port)
         }
 
         pr_debug("i2c-parport: attaching to %s\n", port->name);
+        parport_disable_irq(port);
         adapter->pdev = parport_register_device(port, "i2c-parport",
-                NULL, NULL, NULL, PARPORT_FLAG_EXCL, NULL);
+                NULL, NULL, i2c_parport_irq, PARPORT_FLAG_EXCL, adapter);
         if (!adapter->pdev) {
                 printk(KERN_ERR "i2c-parport: Unable to register with parport\n");
                 goto ERROR0;
@@ -197,6 +214,18 @@ static void i2c_parport_attach (struct parport *port)
                 goto ERROR1;
         }
 
+        /* Setup SMBus alert if supported */
+        if (adapter_parm[type].smbus_alert) {
+                adapter->alert_data.alert_edge_triggered = 1;
+                adapter->ara = i2c_setup_smbus_alert(&adapter->adapter,
+                                                     &adapter->alert_data);
+                if (adapter->ara)
+                        parport_enable_irq(port);
+                else
+                        printk(KERN_WARNING "i2c-parport: Failed to register "
+                               "ARA client\n");
+        }
+
         /* Add the new adapter to the list */
         adapter->next = adapter_list;
         adapter_list = adapter;
@@ -217,6 +246,10 @@ static void i2c_parport_detach (struct parport *port)
         for (prev = NULL, adapter = adapter_list; adapter;
              prev = adapter, adapter = adapter->next) {
                 if (adapter->pdev->port == port) {
+                        if (adapter->ara) {
+                                parport_disable_irq(port);
+                                i2c_unregister_device(adapter->ara);
+                        }
                         i2c_del_adapter(&adapter->adapter);
 
                         /* Un-init if needed (power off...) */
diff --git a/drivers/i2c/busses/i2c-parport.h b/drivers/i2c/busses/i2c-parport.h
index ed69d846cb95..a9f66816546c 100644
--- a/drivers/i2c/busses/i2c-parport.h
+++ b/drivers/i2c/busses/i2c-parport.h
@@ -1,7 +1,7 @@
 /* ------------------------------------------------------------------------ *
  * i2c-parport.h I2C bus over parallel port                                 *
  * ------------------------------------------------------------------------ *
-   Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
+   Copyright (C) 2003-2010 Jean Delvare <khali@linux-fr.org>
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -38,6 +38,7 @@ struct adapter_parm {
         struct lineop getsda;
         struct lineop getscl;
         struct lineop init;
+        unsigned int smbus_alert:1;
 };
 
 static struct adapter_parm adapter_parm[] = {
@@ -73,6 +74,7 @@ static struct adapter_parm adapter_parm[] = {
                 .setscl = { 0x01, DATA, 1 },
                 .getsda = { 0x10, STAT, 1 },
                 .init   = { 0xf0, DATA, 0 },
+                .smbus_alert = 1,
         },
         /* type 5: ADM1025, ADM1030 and ADM1031 evaluation boards */
         {