powerpc/83xx: Add shutdown request support to MCU handling on MPC8349 MITX

This patch add support for calling ctrl_alt_del() when the power button is
pressed for more than about 2 seconds on some freescale MPC83xx evaluation
boards and reference design.

The code uses a kthread to poll the CTRL_BTN bit each second.

Also change Kconfig entry of the driver to bool, as device's gpio
registration is broken when loading as module.

Tested on an MPC8315E RDB board.

Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

2 files changed, 58 insertions, 2 deletions

diff --git a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
index 70798ac911ef..ef6537b8ed33 100644
--- a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
+++ b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
@@ -21,6 +21,8 @@
 #include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/slab.h>
+#include <linux/kthread.h>
+#include <linux/reboot.h>
 #include <asm/prom.h>
 #include <asm/machdep.h>
 
@@ -30,6 +32,7 @@
  */
 #define MCU_REG_CTRL    0x20
 #define MCU_CTRL_POFF   0x40
+#define MCU_CTRL_BTN    0x80
 
 #define MCU_NUM_GPIO    2
 
@@ -42,13 +45,55 @@ struct mcu {
 
 static struct mcu *glob_mcu;
 
+struct task_struct *shutdown_thread;
+static int shutdown_thread_fn(void *data)
+{
+        int ret;
+        struct mcu *mcu = glob_mcu;
+
+        while (!kthread_should_stop()) {
+                ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL);
+                if (ret < 0)
+                        pr_err("MCU status reg read failed.\n");
+                mcu->reg_ctrl = ret;
+
+
+                if (mcu->reg_ctrl & MCU_CTRL_BTN) {
+                        i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,
+                                                  mcu->reg_ctrl & ~MCU_CTRL_BTN);
+
+                        ctrl_alt_del();
+                }
+
+                set_current_state(TASK_INTERRUPTIBLE);
+                schedule_timeout(HZ);
+        }
+
+        return 0;
+}
+
+static ssize_t show_status(struct device *d,
+                           struct device_attribute *attr, char *buf)
+{
+        int ret;
+        struct mcu *mcu = glob_mcu;
+
+        ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL);
+        if (ret < 0)
+                return -ENODEV;
+        mcu->reg_ctrl = ret;
+
+        return sprintf(buf, "%02x\n", ret);
+}
+static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
+
 static void mcu_power_off(void)
 {
         struct mcu *mcu = glob_mcu;
 
         pr_info("Sending power-off request to the MCU...\n");
         mutex_lock(&mcu->lock);
-        i2c_smbus_write_byte_data(glob_mcu->client, MCU_REG_CTRL,
+        i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,
                                   mcu->reg_ctrl | MCU_CTRL_POFF);
         mutex_unlock(&mcu->lock);
 }
@@ -130,6 +175,13 @@ static int __devinit mcu_probe(struct i2c_client *client,
                 dev_info(&client->dev, "will provide power-off service\n");
         }
 
+        if (device_create_file(&client->dev, &dev_attr_status))
+                dev_err(&client->dev,
+                        "couldn't create device file for status\n");
+
+        shutdown_thread = kthread_run(shutdown_thread_fn, NULL,
+                                      "mcu-i2c-shdn");
+
         return 0;
 err:
         kfree(mcu);
@@ -141,6 +193,10 @@ static int __devexit mcu_remove(struct i2c_client *client)
         struct mcu *mcu = i2c_get_clientdata(client);
         int ret;
 
+        kthread_stop(shutdown_thread);
+
+        device_remove_file(&client->dev, &dev_attr_status);
+
         if (glob_mcu == mcu) {
                 ppc_md.power_off = NULL;
                 glob_mcu = NULL;
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 9fdb9b6ab371..e4588721ef34 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -346,7 +346,7 @@ config SIMPLE_GPIO
           on-board peripherals.
 
 config MCU_MPC8349EMITX
-        tristate "MPC8349E-mITX MCU driver"
+        bool "MPC8349E-mITX MCU driver"
         depends on I2C && PPC_83xx
         select GENERIC_GPIO
         select ARCH_REQUIRE_GPIOLIB