regmap: avoid -Wint-in-bool-context warning

[sfrench/cifs-2.6.git] / include / linux / regmap.h

diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 978abfbac61783091046d63dbe23aedd2ad82b3c..edad98890b9b69833bd331bf983171675da1d6be 100644 (file)
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -120,21 +120,65 @@ struct reg_sequence {
  */
 #define regmap_read_poll_timeout(map, addr, val, cond, sleep_us, timeout_us) \
 ({ \
-       ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); \
+       u64 __timeout_us = (timeout_us); \
+       unsigned long __sleep_us = (sleep_us); \
+       ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \
+       int __ret; \
+       might_sleep_if(__sleep_us); \
+       for (;;) { \
+               __ret = regmap_read((map), (addr), &(val)); \
+               if (__ret) \
+                       break; \
+               if (cond) \
+                       break; \
+               if ((__timeout_us) && \
+                   ktime_compare(ktime_get(), __timeout) > 0) { \
+                       __ret = regmap_read((map), (addr), &(val)); \
+                       break; \
+               } \
+               if (__sleep_us) \
+                       usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
+       } \
+       __ret ?: ((cond) ? 0 : -ETIMEDOUT); \
+})
+
+/**
+ * regmap_field_read_poll_timeout - Poll until a condition is met or timeout
+ *
+ * @field: Regmap field to read from
+ * @val: Unsigned integer variable to read the value into
+ * @cond: Break condition (usually involving @val)
+ * @sleep_us: Maximum time to sleep between reads in us (0
+ *            tight-loops).  Should be less than ~20ms since usleep_range
+ *            is used (see Documentation/timers/timers-howto.txt).
+ * @timeout_us: Timeout in us, 0 means never timeout
+ *
+ * Returns 0 on success and -ETIMEDOUT upon a timeout or the regmap_field_read
+ * error return value in case of a error read. In the two former cases,
+ * the last read value at @addr is stored in @val. Must not be called
+ * from atomic context if sleep_us or timeout_us are used.
+ *
+ * This is modelled after the readx_poll_timeout macros in linux/iopoll.h.
+ */
+#define regmap_field_read_poll_timeout(field, val, cond, sleep_us, timeout_us) \
+({ \
+       u64 __timeout_us = (timeout_us); \
+       unsigned long __sleep_us = (sleep_us); \
+       ktime_t timeout = ktime_add_us(ktime_get(), __timeout_us); \
        int pollret; \
-       might_sleep_if(sleep_us); \
+       might_sleep_if(__sleep_us); \
        for (;;) { \
-               pollret = regmap_read((map), (addr), &(val)); \
+               pollret = regmap_field_read((field), &(val)); \
                if (pollret) \
                        break; \
                if (cond) \
                        break; \
-               if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { \
-                       pollret = regmap_read((map), (addr), &(val)); \
+               if (__timeout_us && ktime_compare(ktime_get(), timeout) > 0) { \
+                       pollret = regmap_field_read((field), &(val)); \
                        break; \
                } \
-               if (sleep_us) \
-                       usleep_range((sleep_us >> 2) + 1, sleep_us); \
+               if (__sleep_us) \
+                       usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
        } \
        pollret ?: ((cond) ? 0 : -ETIMEDOUT); \
 })