mfd: Support software initiated shutdown of WM831x PMICs

In systems where there is no hardware signal from the processor to the
PMIC to initiate the final power off sequence we must initiate the
shutdown with a register write to the PMIC. Support such systems in the
driver. Since this may prevent a full shutdown of the system platform
data is used to enable the feature.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index 9338f8dcbb83581661793936fceb1a794efff0f2..e758c89ac5bb5aa08e3ffe591dadc431c0b333e1 100644 (file)
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -25,6 +25,7 @@
 #include <linux/mfd/wm831x/irq.h>
 #include <linux/mfd/wm831x/auxadc.h>
 #include <linux/mfd/wm831x/otp.h>
+#include <linux/mfd/wm831x/pmu.h>
 #include <linux/mfd/wm831x/regulator.h>
 
 /* Current settings - values are 2*2^(reg_val/4) microamps.  These are
@@ -1621,6 +1622,7 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
        mutex_init(&wm831x->io_lock);
        mutex_init(&wm831x->key_lock);
        dev_set_drvdata(wm831x->dev, wm831x);
+       wm831x->soft_shutdown = pdata->soft_shutdown;
 
        ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
        if (ret < 0) {
@@ -1922,6 +1924,15 @@ int wm831x_device_suspend(struct wm831x *wm831x)
        return 0;
 }
 
+void wm831x_device_shutdown(struct wm831x *wm831x)
+{
+       if (wm831x->soft_shutdown) {
+               dev_info(wm831x->dev, "Initiating shutdown...\n");
+               wm831x_set_bits(wm831x, WM831X_POWER_STATE, WM831X_CHIP_ON, 0);
+       }
+}
+EXPORT_SYMBOL_GPL(wm831x_device_shutdown);
+
 MODULE_DESCRIPTION("Core support for the WM831X AudioPlus PMIC");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Mark Brown");

diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
index 3ec6085d5fc061cd0c42fdeac507b51c6e53cd64..ac8da1d439daab72b9118ae6cf8675f3bac6dc9a 100644 (file)
--- a/drivers/mfd/wm831x-i2c.c
+++ b/drivers/mfd/wm831x-i2c.c
@@ -65,6 +65,13 @@ static int wm831x_i2c_suspend(struct device *dev)
        return wm831x_device_suspend(wm831x);
 }
 
+static void wm831x_i2c_shutdown(struct i2c_client *i2c)
+{
+       struct wm831x *wm831x = i2c_get_clientdata(i2c);
+
+       wm831x_device_shutdown(wm831x);
+}
+
 static const struct i2c_device_id wm831x_i2c_id[] = {
        { "wm8310", WM8310 },
        { "wm8311", WM8311 },
@@ -89,6 +96,7 @@ static struct i2c_driver wm831x_i2c_driver = {
        },
        .probe = wm831x_i2c_probe,
        .remove = wm831x_i2c_remove,
+       .shutdown = wm831x_i2c_shutdown,
        .id_table = wm831x_i2c_id,
 };
 

diff --git a/drivers/mfd/wm831x-spi.c b/drivers/mfd/wm831x-spi.c
index 5ea60cd860fc8911b01773df189ee24ad3aa38c7..8d6a9a969dbc246e87d46eb8bf38e0b62b796149 100644 (file)
--- a/drivers/mfd/wm831x-spi.c
+++ b/drivers/mfd/wm831x-spi.c
@@ -68,6 +68,13 @@ static int wm831x_spi_suspend(struct device *dev)
        return wm831x_device_suspend(wm831x);
 }
 
+static void wm831x_spi_shutdown(struct spi_device *spi)
+{
+       struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
+
+       wm831x_device_shutdown(wm831x);
+}
+
 static const struct dev_pm_ops wm831x_spi_pm = {
        .freeze = wm831x_spi_suspend,
        .suspend = wm831x_spi_suspend,
@@ -95,6 +102,7 @@ static struct spi_driver wm831x_spi_driver = {
        .id_table       = wm831x_spi_ids,
        .probe          = wm831x_spi_probe,
        .remove         = __devexit_p(wm831x_spi_remove),
+       .shutdown       = wm831x_spi_shutdown,
 };
 
 static int __init wm831x_spi_init(void)

diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h
index 44acdb25681b855a5be64b349dbf2a9e5066cc02..ed8fe0d04097277e9569f78617719c64cde5ed5b 100644 (file)
--- a/include/linux/mfd/wm831x/core.h
+++ b/include/linux/mfd/wm831x/core.h
@@ -371,6 +371,8 @@ struct wm831x {
        int irq_masks_cur[WM831X_NUM_IRQ_REGS];   /* Currently active value */
        int irq_masks_cache[WM831X_NUM_IRQ_REGS]; /* Cached hardware value */
 
+       bool soft_shutdown;
+
        /* Chip revision based flags */
        unsigned has_gpio_ena:1;         /* Has GPIO enable bit */
        unsigned has_cs_sts:1;           /* Has current sink status bit */
@@ -409,6 +411,7 @@ int wm831x_bulk_read(struct wm831x *wm831x, unsigned short reg,
 int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq);
 void wm831x_device_exit(struct wm831x *wm831x);
 int wm831x_device_suspend(struct wm831x *wm831x);
+void wm831x_device_shutdown(struct wm831x *wm831x);
 int wm831x_irq_init(struct wm831x *wm831x, int irq);
 void wm831x_irq_exit(struct wm831x *wm831x);
 void wm831x_auxadc_init(struct wm831x *wm831x);

diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
index 0ba24599fe514e9963d1b665ad83e1ac12f418bf..1d7a3f7b3b5dbe2022929abd78b5dbe7dda75a86 100644 (file)
--- a/include/linux/mfd/wm831x/pdata.h
+++ b/include/linux/mfd/wm831x/pdata.h
@@ -123,6 +123,9 @@ struct wm831x_pdata {
        /** Disable the touchscreen */
        bool disable_touch;
 
+       /** The driver should initiate a power off sequence during shutdown */
+       bool soft_shutdown;
+
        int irq_base;
        int gpio_base;
        int gpio_defaults[WM831X_GPIO_NUM];