regulator/mfd: max14577: Export symbols for calculating charger current

This patch prepares for changing the max14577 charger driver to allow
configuring battery-dependent settings from DTS.

The patch moves from regulator driver to MFD core driver and exports:
 - function for calculating register value for charger's current;
 - table of limits for chargers (MAX14577, MAX77836).

Previously they were used only by the max14577 regulator driver. In next
patch the charger driver will use them as well. Exporting them will
reduce unnecessary code duplication.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Mark Brown <broonie@linaro.org>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

2 files changed, 34 insertions, 11 deletions

diff --git a/include/linux/mfd/max14577-private.h b/include/linux/mfd/max14577-private.h
index d6f321699b89..7d514839c764 100644
--- a/include/linux/mfd/max14577-private.h
+++ b/include/linux/mfd/max14577-private.h
@@ -281,17 +281,17 @@ enum max14577_charger_reg {
 #define CHGCTRL7_OTPCGHCVS_SHIFT        0
 #define CHGCTRL7_OTPCGHCVS_MASK         (0x3 << CHGCTRL7_OTPCGHCVS_SHIFT)
 
-/* MAX14577 regulator current limits (as in CHGCTRL4 register), uA */
-#define MAX14577_REGULATOR_CURRENT_LIMIT_MIN             90000
-#define MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_START     200000
-#define MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP       50000
-#define MAX14577_REGULATOR_CURRENT_LIMIT_MAX            950000
-
-/* MAX77836 regulator current limits (as in CHGCTRL4 register), uA */
-#define MAX77836_REGULATOR_CURRENT_LIMIT_MIN             45000
-#define MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_START     100000
-#define MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_STEP       25000
-#define MAX77836_REGULATOR_CURRENT_LIMIT_MAX            475000
+/* MAX14577 charger current limits (as in CHGCTRL4 register), uA */
+#define MAX14577_CHARGER_CURRENT_LIMIT_MIN               90000U
+#define MAX14577_CHARGER_CURRENT_LIMIT_HIGH_START       200000U
+#define MAX14577_CHARGER_CURRENT_LIMIT_HIGH_STEP         50000U
+#define MAX14577_CHARGER_CURRENT_LIMIT_MAX              950000U
+
+/* MAX77836 charger current limits (as in CHGCTRL4 register), uA */
+#define MAX77836_CHARGER_CURRENT_LIMIT_MIN               45000U
+#define MAX77836_CHARGER_CURRENT_LIMIT_HIGH_START       100000U
+#define MAX77836_CHARGER_CURRENT_LIMIT_HIGH_STEP         25000U
+#define MAX77836_CHARGER_CURRENT_LIMIT_MAX              475000U
 
 /* MAX14577 regulator SFOUT LDO voltage, fixed, uV */
 #define MAX14577_REGULATOR_SAFEOUT_VOLTAGE              4900000
diff --git a/include/linux/mfd/max14577.h b/include/linux/mfd/max14577.h
index c83fbed1c7b6..3c098d57b1d1 100644
--- a/include/linux/mfd/max14577.h
+++ b/include/linux/mfd/max14577.h
@@ -74,4 +74,27 @@ struct max14577_platform_data {
         struct max14577_regulator_platform_data *regulators;
 };
 
+/*
+ * Valid limits of current for max14577 and max77836 chargers.
+ * They must correspond to MBCICHWRCL and MBCICHWRCH fields in CHGCTRL4
+ * register for given chipset.
+ */
+struct maxim_charger_current {
+        /* Minimal current, set in CHGCTRL4/MBCICHWRCL, uA */
+        unsigned int min;
+        /*
+         * Minimal current when high setting is active,
+         * set in CHGCTRL4/MBCICHWRCH, uA
+         */
+        unsigned int high_start;
+        /* Value of one step in high setting, uA */
+        unsigned int high_step;
+        /* Maximum current of high setting, uA */
+        unsigned int max;
+};
+
+extern const struct maxim_charger_current maxim_charger_currents[];
+extern int maxim_charger_calc_reg_current(const struct maxim_charger_current *limits,
+                unsigned int min_ua, unsigned int max_ua, u8 *dst);
+
 #endif /* __MAX14577_H__ */