pmic: tps65218: add useful functions and defines

Add the following functions:
tps65218_reg_read() for accessing redisters
tps65218_toggle_fseal() for toggling the fseal bit
tps65218_lock_fsea() for locking the fseal bit to 1

Add the following defines:
All status register bits

Cc: Tom Rini <trini@konsulko.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/drivers/power/pmic/pmic_tps65218.c b/drivers/power/pmic/pmic_tps65218.c
index dbc7a73a7235eb090efccb350238eebba8f31f3f..0fd0ad478a2bc2bbb100a5cd8a4b7db3d08099d9 100644 (file)
--- a/drivers/power/pmic/pmic_tps65218.c
+++ b/drivers/power/pmic/pmic_tps65218.c
@@ -11,6 +11,20 @@
 #include <power/pmic.h>
 #include <power/tps65218.h>
 
+int tps65218_reg_read(uchar dest_reg, uchar *dest_val)
+{
+       uchar read_val;
+       int ret;
+
+       ret = i2c_read(TPS65218_CHIP_PM, dest_reg, 1, &read_val, 1);
+       if (ret)
+               return ret;
+
+       *dest_val = read_val;
+
+       return 0;
+}
+
 /**
  *  tps65218_reg_write() - Generic function that can write a TPS65218 PMIC
  *                        register or bit field regardless of protection
@@ -98,6 +112,48 @@ int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel)
        return 0;
 }
 
+/**
+ * tps65218_toggle_fseal() - Perform the sequence that toggles the FSEAL bit.
+ *
+ * @return:                 0 on success, -EBADE if the sequence was broken
+ */
+int tps65218_toggle_fseal(void)
+{
+       if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
+                              0xb1, TPS65218_MASK_ALL_BITS))
+               return -EBADE;
+
+       if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
+                              0xfe, TPS65218_MASK_ALL_BITS))
+               return -EBADE;
+
+       if (tps65218_reg_write(TPS65218_PROT_LEVEL_NONE, TPS65218_PASSWORD,
+                              0xa3, TPS65218_MASK_ALL_BITS))
+               return -EBADE;
+
+       return 0;
+}
+
+/**
+ * tps65218_lock_fseal() - Perform the sequence that locks the FSEAL bit to 1.
+ *
+ * The FSEAL bit prevents the PMIC from turning off DCDC5 and DCDC6. It can be
+ * toggled at most 3 times: 0->1, 1->0, and finally 0->1. After the third switch
+ * its value is locked and can only be reset by powering off the PMIC entirely.
+ *
+ * @return:               0 on success, -EBADE if the sequence was broken
+ */
+int tps65218_lock_fseal(void)
+{
+       int i;
+
+       for (i = 0; i < 3; i++)
+               if (tps65218_toggle_fseal())
+                       return -EBADE;
+
+       return 0;
+}
+
 int power_tps65218_init(unsigned char bus)
 {
        static const char name[] = "TPS65218_PMIC";

diff --git a/include/power/tps65218.h b/include/power/tps65218.h
index 63fc7b343f8ccec3ef910f9b103ae95f34eac9f8..4d68faacafd3bad5d04d1468b04462f7b96683f9 100644 (file)
--- a/include/power/tps65218.h
+++ b/include/power/tps65218.h
@@ -8,6 +8,8 @@
 #ifndef __POWER_TPS65218_H__
 #define __POWER_TPS65218_H__
 
+#include <linux/bitops.h>
+
 /* I2C chip address */
 #define TPS65218_CHIP_PM                       0x24
 
@@ -60,8 +62,18 @@ enum {
 #define TPS65218_DCDC_VOLT_SEL_1260MV          0x29
 #define TPS65218_DCDC_VOLT_SEL_1330MV          0x30
 
+#define TPS65218_CC_STAT       (BIT(0) | BIT(1))
+#define TPS65218_STATE         (BIT(2) | BIT(3))
+#define TPS65218_PB_STATE      BIT(4)
+#define TPS65218_AC_STATE      BIT(5)
+#define TPS65218_EE            BIT(6)
+#define TPS65218_FSEAL         BIT(7)
+
+int tps65218_reg_read(uchar dest_reg, uchar *dest_val);
 int tps65218_reg_write(uchar prot_level, uchar dest_reg, uchar dest_val,
                       uchar mask);
 int tps65218_voltage_update(uchar dc_cntrl_reg, uchar volt_sel);
+int tps65218_toggle_fseal(void);
+int tps65218_lock_fseal(void);
 int power_tps65218_init(unsigned char bus);
 #endif /* __POWER_TPS65218_H__ */