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path: root/arch/x86/platform/intel/iosf_mbi.c
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Diffstat (limited to 'arch/x86/platform/intel/iosf_mbi.c')
-rw-r--r--arch/x86/platform/intel/iosf_mbi.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/x86/platform/intel/iosf_mbi.c b/arch/x86/platform/intel/iosf_mbi.c
index edf2c54bf131..a952ac199741 100644
--- a/arch/x86/platform/intel/iosf_mbi.c
+++ b/arch/x86/platform/intel/iosf_mbi.c
@@ -34,6 +34,8 @@
static struct pci_dev *mbi_pdev;
static DEFINE_SPINLOCK(iosf_mbi_lock);
+static DEFINE_MUTEX(iosf_mbi_punit_mutex);
+static BLOCKING_NOTIFIER_HEAD(iosf_mbi_pmic_bus_access_notifier);
static inline u32 iosf_mbi_form_mcr(u8 op, u8 port, u8 offset)
{
@@ -190,6 +192,53 @@ bool iosf_mbi_available(void)
}
EXPORT_SYMBOL(iosf_mbi_available);
+void iosf_mbi_punit_acquire(void)
+{
+ mutex_lock(&iosf_mbi_punit_mutex);
+}
+EXPORT_SYMBOL(iosf_mbi_punit_acquire);
+
+void iosf_mbi_punit_release(void)
+{
+ mutex_unlock(&iosf_mbi_punit_mutex);
+}
+EXPORT_SYMBOL(iosf_mbi_punit_release);
+
+int iosf_mbi_register_pmic_bus_access_notifier(struct notifier_block *nb)
+{
+ int ret;
+
+ /* Wait for the bus to go inactive before registering */
+ mutex_lock(&iosf_mbi_punit_mutex);
+ ret = blocking_notifier_chain_register(
+ &iosf_mbi_pmic_bus_access_notifier, nb);
+ mutex_unlock(&iosf_mbi_punit_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(iosf_mbi_register_pmic_bus_access_notifier);
+
+int iosf_mbi_unregister_pmic_bus_access_notifier(struct notifier_block *nb)
+{
+ int ret;
+
+ /* Wait for the bus to go inactive before unregistering */
+ mutex_lock(&iosf_mbi_punit_mutex);
+ ret = blocking_notifier_chain_unregister(
+ &iosf_mbi_pmic_bus_access_notifier, nb);
+ mutex_unlock(&iosf_mbi_punit_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(iosf_mbi_unregister_pmic_bus_access_notifier);
+
+int iosf_mbi_call_pmic_bus_access_notifier_chain(unsigned long val, void *v)
+{
+ return blocking_notifier_call_chain(
+ &iosf_mbi_pmic_bus_access_notifier, val, v);
+}
+EXPORT_SYMBOL(iosf_mbi_call_pmic_bus_access_notifier_chain);
+
#ifdef CONFIG_IOSF_MBI_DEBUG
static u32 dbg_mdr;
static u32 dbg_mcr;