x86/platform/intel/iosf_mbi: Add a mutex for P-Unit access

 */

int iosf_mbi_modify(u8 port, u8 opcode, u32 offset, u32 mdr, u32 mask);

/**

 * iosf_mbi_punit_acquire() - Acquire access to the P-Unit

 *

 * One some systems the P-Unit accesses the PMIC to change various voltages

 * through the same bus as other kernel drivers use for e.g. battery monitoring.

 *

 * If a driver sends requests to the P-Unit which require the P-Unit to access

 * the PMIC bus while another driver is also accessing the PMIC bus various bad

 * things happen.

 *

 * To avoid these problems this function must be called before accessing the

 * P-Unit or the PMIC, be it through iosf_mbi* functions or through other means.

 *

 * Note on these systems the i2c-bus driver will request a sempahore from the

 * P-Unit for exclusive access to the PMIC bus when i2c drivers are accessing

 * it, but this does not appear to be sufficient, we still need to avoid making

 * certain P-Unit requests during the access window to avoid problems.

 *

 * This function locks a mutex, as such it may sleep.

 */

void iosf_mbi_punit_acquire(void);

/**

 * iosf_mbi_punit_release() - Release access to the P-Unit

 */

void iosf_mbi_punit_release(void);

#else /* CONFIG_IOSF_MBI is not enabled */

static inline

bool iosf_mbi_available(void)

	WARN(1, "IOSF_MBI driver not available");

	return -EPERM;

}

static inline void iosf_mbi_punit_acquire(void) {}

static inline void iosf_mbi_punit_release(void) {}

#endif /* CONFIG_IOSF_MBI */

#endif /* IOSF_MBI_SYMS_H */

static struct pci_dev *mbi_pdev;

static DEFINE_SPINLOCK(iosf_mbi_lock);

static DEFINE_MUTEX(iosf_mbi_punit_mutex);

static inline u32 iosf_mbi_form_mcr(u8 op, u8 port, u8 offset)

{

}

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);

#ifdef CONFIG_IOSF_MBI_DEBUG

static u32	dbg_mdr;

static u32	dbg_mcr;