mfd: sm501 build fixes when CONFIG_MFD_SM501_GPIO unset

Fix the build problems if CONFIG_MFD_SM501_GPIO is not set, which is
generally when there is no gpiolib support available as currently happens
on x86 when building PCI SM501.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Tested-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 24 insertions, 5 deletions

diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index 2dfb41aabcaf..79d7aea5510b 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -19,7 +19,6 @@
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/pci.h>
-#include <linux/gpio.h>
 #include <linux/i2c-gpio.h>
 
 #include <linux/sm501.h>
@@ -35,6 +34,9 @@ struct sm501_device {
 
 struct sm501_gpio;
 
+#ifdef CONFIG_MFD_SM501_GPIO
+#include <linux/gpio.h>
+
 struct sm501_gpio_chip {
         struct gpio_chip        gpio;
         struct sm501_gpio       *ourgpio;       /* to get back to parent. */
@@ -50,6 +52,11 @@ struct sm501_gpio {
         void __iomem            *regs;
         struct resource         *regs_res;
 };
+#else
+struct sm501_gpio {
+        /* no gpio support, empty definition for sm501_devdata. */
+};
+#endif
 
 struct sm501_devdata {
         spinlock_t                       reg_lock;
@@ -1082,6 +1089,9 @@ static void sm501_gpio_remove(struct sm501_devdata *sm)
         struct sm501_gpio *gpio = &sm->gpio;
         int ret;
 
+        if (!sm->gpio.registered)
+                return;
+
         ret = gpiochip_remove(&gpio->low.gpio);
         if (ret)
                 dev_err(sm->dev, "cannot remove low chip, cannot tidy up\n");
@@ -1100,6 +1110,11 @@ static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
         struct sm501_gpio *gpio = &sm->gpio;
         return pin + (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
 }
+
+static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
+{
+        return sm->gpio.registered;
+}
 #else
 static inline int sm501_register_gpio(struct sm501_devdata *sm)
 {
@@ -1114,6 +1129,11 @@ static inline int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
 {
         return -1;
 }
+
+static inline int sm501_gpio_isregistered(struct sm501_devdata *sm)
+{
+        return 0;
+}
 #endif
 
 static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
@@ -1330,8 +1350,8 @@ static int sm501_init_dev(struct sm501_devdata *sm)
         }
 
         if (pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
-                if (!sm->gpio.registered)
-                        dev_err(sm->dev, "no gpio registered for i2c gpio.\n");
+                if (!sm501_gpio_isregistered(sm))
+                        dev_err(sm->dev, "no gpio available for i2c gpio.\n");
                 else
                         sm501_register_gpio_i2c(sm, pdata);
         }
@@ -1643,8 +1663,7 @@ static void sm501_dev_remove(struct sm501_devdata *sm)
 
         device_remove_file(sm->dev, &dev_attr_dbg_regs);
 
-        if (sm->gpio.registered)
-                sm501_gpio_remove(sm);
+        sm501_gpio_remove(sm);
 }
 
 static void sm501_pci_remove(struct pci_dev *dev)