diff options
Diffstat (limited to 'drivers/regulator/pfuze100-regulator.c')
| -rw-r--r-- | drivers/regulator/pfuze100-regulator.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/regulator/pfuze100-regulator.c b/drivers/regulator/pfuze100-regulator.c index 44b1da7cc374..f75b64e41faa 100644 --- a/drivers/regulator/pfuze100-regulator.c +++ b/drivers/regulator/pfuze100-regulator.c @@ -24,6 +24,15 @@ #define PFUZE100_STANDBY_OFFSET 1 #define PFUZE100_MODE_OFFSET 3 #define PFUZE100_CONF_OFFSET 4 +/* + * below regs will lost after exit from LPSR mode(PFUZE3000), need to be saved + * and restored: + * 0x20~0x40: 33 + * 0x66~0x71: 12 + * 0x7f: 1 + * total 46 registers. + */ +#define PFUZE100_REG_SAVED_NUM (33 + 12 + 1) #define PFUZE100_DEVICEID 0x0 #define PFUZE100_REVID 0x3 @@ -73,6 +82,8 @@ struct pfuze_chip { int flags; struct regmap *regmap; struct device *dev; + bool need_restore; + unsigned int reg_save_array[PFUZE100_REG_SAVED_NUM]; struct pfuze_regulator regulator_descs[PFUZE100_MAX_REGULATOR]; struct regulator_dev *regulators[PFUZE100_MAX_REGULATOR]; struct pfuze_regulator *pfuze_regulators; @@ -858,6 +869,9 @@ static int pfuze100_regulator_probe(struct i2c_client *client, } } + if (of_get_property(client->dev.of_node, "fsl,lpsr-mode", NULL)) + pfuze_chip->need_restore = true; + if (of_property_read_bool(client->dev.of_node, "fsl,pmic-stby-poweroff")) return pfuze_power_off_prepare_init(pfuze_chip); @@ -875,11 +889,90 @@ static int pfuze100_regulator_remove(struct i2c_client *client) return 0; } +#ifdef CONFIG_PM_SLEEP +static int pfuze_reg_save_restore(struct pfuze_chip *pfuze_chip, int start, + int end, int index, bool save) +{ + int i, ret; + + for (i = 0; i < end - start + 1; i++) { + if (save) + ret = regmap_read(pfuze_chip->regmap, start + i, + &pfuze_chip->reg_save_array[index + i]); + else + ret = regmap_write(pfuze_chip->regmap, start + i, + pfuze_chip->reg_save_array[index + i]); + + if (ret) + return ret; + } + + return index + i; +} + +static int __maybe_unused pfuze_suspend(struct device *dev) +{ + struct pfuze_chip *pfuze_chip = i2c_get_clientdata(to_i2c_client(dev)); + int index = 0; + + if (pfuze_chip->need_restore) { + /* 0x20~0x40 */ + index = pfuze_reg_save_restore(pfuze_chip, 0x20, 0x40, index, true); + if (index < 0) + goto err_ret; + /* 0x66~0x71 */ + index = pfuze_reg_save_restore(pfuze_chip, 0x66, 0x71, ++index, true); + if (index < 0) + goto err_ret; + /* 0x7f */ + index = pfuze_reg_save_restore(pfuze_chip, 0x7f, 0x7f, ++index, true); + if (index < 0) + goto err_ret; + } + + return 0; + +err_ret: + return index; +} + +static int __maybe_unused pfuze_resume(struct device *dev) +{ + struct pfuze_chip *pfuze_chip = i2c_get_clientdata(to_i2c_client(dev)); + int index = 0; + + if (pfuze_chip->need_restore) { + /* 0x20~0x40 */ + index = pfuze_reg_save_restore(pfuze_chip, 0x20, 0x40, index, false); + if (index < 0) + goto err_ret; + /* 0x66~0x71 */ + index = pfuze_reg_save_restore(pfuze_chip, 0x66, 0x71, ++index, false); + if (index < 0) + goto err_ret; + /* 0x7f */ + index = pfuze_reg_save_restore(pfuze_chip, 0x7f, 0x7f, ++index, false); + if (index < 0) + goto err_ret; + } + + return 0; + +err_ret: + return index; +} +#endif + +static const struct dev_pm_ops pfuze_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pfuze_suspend, pfuze_resume) +}; + static struct i2c_driver pfuze_driver = { .id_table = pfuze_device_id, .driver = { .name = "pfuze100-regulator", .of_match_table = pfuze_dt_ids, + .pm = &pfuze_pm_ops, }, .probe = pfuze100_regulator_probe, .remove = pfuze100_regulator_remove, |