From 9bcfca123cbcf73234ba5b82e62d189d536d1ef2 Mon Sep 17 00:00:00 2001 From: Nikita Kiryanov Date: Fri, 19 Feb 2016 19:19:46 +0200 Subject: 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 Cc: Albert Aribaud Cc: Igor Grinberg Signed-off-by: Nikita Kiryanov Reviewed-by: Tom Rini --- drivers/power/pmic/pmic_tps65218.c | 56 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) (limited to 'drivers/power') diff --git a/drivers/power/pmic/pmic_tps65218.c b/drivers/power/pmic/pmic_tps65218.c index dbc7a73..0fd0ad4 100644 --- a/drivers/power/pmic/pmic_tps65218.c +++ b/drivers/power/pmic/pmic_tps65218.c @@ -11,6 +11,20 @@ #include #include +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"; -- cgit v1.1