regmap: add iopoll-like polling macro for regmap_field

This patch adds a macro regmap_field_read_poll_timeout that works
similar to the readx_poll_timeout defined in linux/iopoll.h, except
that this can also return the error value returned by a failed
regmap_field_read.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 978abfb..93a4663 100644 (file)
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -139,6 +139,45 @@ struct reg_sequence {
        pollret ?: ((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) \
+({ \
+       ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); \
+       int pollret; \
+       might_sleep_if(sleep_us); \
+       for (;;) { \
+               pollret = regmap_field_read((field), &(val)); \
+               if (pollret) \
+                       break; \
+               if (cond) \
+                       break; \
+               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); \
+       } \
+       pollret ?: ((cond) ? 0 : -ETIMEDOUT); \
+})
+
 #ifdef CONFIG_REGMAP
 
 enum regmap_endian {