diff options
author | Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> | 2021-06-03 08:42:12 +0300 |
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committer | Mark Brown <broonie@kernel.org> | 2021-06-21 13:08:41 +0100 |
commit | 89a6a5e56c8248a077d12424a1383a6b18ea840b (patch) | |
tree | 31a8361eae067daac0747acaac685a5db14cffad /drivers | |
parent | 7111c6d1b31b42c8c758f6681e895a5116e3bad6 (diff) | |
download | linux-89a6a5e56c8248a077d12424a1383a6b18ea840b.tar.bz2 |
regulator: add property parsing and callbacks to set protection limits
Add DT property parsing code and setting callback for regulator over/under
voltage, over-current and temperature error limits.
Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Link: https://lore.kernel.org/r/e7b8007ba9eae7076178bf3363fb942ccb1cc9a5.1622628334.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/regulator/core.c | 122 | ||||
-rw-r--r-- | drivers/regulator/of_regulator.c | 58 | ||||
-rw-r--r-- | drivers/regulator/qcom-labibb-regulator.c | 10 | ||||
-rw-r--r-- | drivers/regulator/qcom_spmi-regulator.c | 6 | ||||
-rw-r--r-- | drivers/regulator/stpmic1_regulator.c | 20 |
5 files changed, 211 insertions, 5 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 85b6d3960369..92fe05178249 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1305,6 +1305,52 @@ static int machine_constraints_current(struct regulator_dev *rdev, static int _regulator_do_enable(struct regulator_dev *rdev); +static int notif_set_limit(struct regulator_dev *rdev, + int (*set)(struct regulator_dev *, int, int, bool), + int limit, int severity) +{ + bool enable; + + if (limit == REGULATOR_NOTIF_LIMIT_DISABLE) { + enable = false; + limit = 0; + } else { + enable = true; + } + + if (limit == REGULATOR_NOTIF_LIMIT_ENABLE) + limit = 0; + + return set(rdev, limit, severity, enable); +} + +static int handle_notify_limits(struct regulator_dev *rdev, + int (*set)(struct regulator_dev *, int, int, bool), + struct notification_limit *limits) +{ + int ret = 0; + + if (!set) + return -EOPNOTSUPP; + + if (limits->prot) + ret = notif_set_limit(rdev, set, limits->prot, + REGULATOR_SEVERITY_PROT); + if (ret) + return ret; + + if (limits->err) + ret = notif_set_limit(rdev, set, limits->err, + REGULATOR_SEVERITY_ERR); + if (ret) + return ret; + + if (limits->warn) + ret = notif_set_limit(rdev, set, limits->warn, + REGULATOR_SEVERITY_WARN); + + return ret; +} /** * set_machine_constraints - sets regulator constraints * @rdev: regulator source @@ -1390,9 +1436,27 @@ static int set_machine_constraints(struct regulator_dev *rdev) } } + /* + * Existing logic does not warn if over_current_protection is given as + * a constraint but driver does not support that. I think we should + * warn about this type of issues as it is possible someone changes + * PMIC on board to another type - and the another PMIC's driver does + * not support setting protection. Board composer may happily believe + * the DT limits are respected - especially if the new PMIC HW also + * supports protection but the driver does not. I won't change the logic + * without hearing more experienced opinion on this though. + * + * If warning is seen as a good idea then we can merge handling the + * over-curret protection and detection and get rid of this special + * handling. + */ if (rdev->constraints->over_current_protection && ops->set_over_current_protection) { - ret = ops->set_over_current_protection(rdev); + int lim = rdev->constraints->over_curr_limits.prot; + + ret = ops->set_over_current_protection(rdev, lim, + REGULATOR_SEVERITY_PROT, + true); if (ret < 0) { rdev_err(rdev, "failed to set over current protection: %pe\n", ERR_PTR(ret)); @@ -1400,6 +1464,62 @@ static int set_machine_constraints(struct regulator_dev *rdev) } } + if (rdev->constraints->over_current_detection) + ret = handle_notify_limits(rdev, + ops->set_over_current_protection, + &rdev->constraints->over_curr_limits); + if (ret) { + if (ret != -EOPNOTSUPP) { + rdev_err(rdev, "failed to set over current limits: %pe\n", + ERR_PTR(ret)); + return ret; + } + rdev_warn(rdev, + "IC does not support requested over-current limits\n"); + } + + if (rdev->constraints->over_voltage_detection) + ret = handle_notify_limits(rdev, + ops->set_over_voltage_protection, + &rdev->constraints->over_voltage_limits); + if (ret) { + if (ret != -EOPNOTSUPP) { + rdev_err(rdev, "failed to set over voltage limits %pe\n", + ERR_PTR(ret)); + return ret; + } + rdev_warn(rdev, + "IC does not support requested over voltage limits\n"); + } + + if (rdev->constraints->under_voltage_detection) + ret = handle_notify_limits(rdev, + ops->set_under_voltage_protection, + &rdev->constraints->under_voltage_limits); + if (ret) { + if (ret != -EOPNOTSUPP) { + rdev_err(rdev, "failed to set under voltage limits %pe\n", + ERR_PTR(ret)); + return ret; + } + rdev_warn(rdev, + "IC does not support requested under voltage limits\n"); + } + + if (rdev->constraints->over_temp_detection) + ret = handle_notify_limits(rdev, + ops->set_thermal_protection, + &rdev->constraints->temp_limits); + if (ret) { + if (ret != -EOPNOTSUPP) { + rdev_err(rdev, "failed to set temperature limits %pe\n", + ERR_PTR(ret)); + return ret; + } + rdev_warn(rdev, + "IC does not support requested temperature limits\n"); + } + if (rdev->constraints->active_discharge && ops->set_active_discharge) { bool ad_state = (rdev->constraints->active_discharge == REGULATOR_ACTIVE_DISCHARGE_ENABLE) ? true : false; diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c index 49f6c05fee34..f54d4f176882 100644 --- a/drivers/regulator/of_regulator.c +++ b/drivers/regulator/of_regulator.c @@ -21,6 +21,62 @@ static const char *const regulator_states[PM_SUSPEND_MAX + 1] = { [PM_SUSPEND_MAX] = "regulator-state-disk", }; +static void fill_limit(int *limit, int val) +{ + if (val) + if (val == 1) + *limit = REGULATOR_NOTIF_LIMIT_ENABLE; + else + *limit = val; + else + *limit = REGULATOR_NOTIF_LIMIT_DISABLE; +} + +static void of_get_regulator_prot_limits(struct device_node *np, + struct regulation_constraints *constraints) +{ + u32 pval; + int i; + static const char *const props[] = { + "regulator-oc-%s-microamp", + "regulator-ov-%s-microvolt", + "regulator-temp-%s-kelvin", + "regulator-uv-%s-microvolt", + }; + struct notification_limit *limits[] = { + &constraints->over_curr_limits, + &constraints->over_voltage_limits, + &constraints->temp_limits, + &constraints->under_voltage_limits, + }; + bool set[4] = {0}; + + /* Protection limits: */ + for (i = 0; i < ARRAY_SIZE(props); i++) { + char prop[255]; + bool found; + int j; + static const char *const lvl[] = { + "protection", "error", "warn" + }; + int *l[] = { + &limits[i]->prot, &limits[i]->err, &limits[i]->warn, + }; + + for (j = 0; j < ARRAY_SIZE(lvl); j++) { + snprintf(prop, 255, props[i], lvl[j]); + found = !of_property_read_u32(np, prop, &pval); + if (found) + fill_limit(l[j], pval); + set[i] |= found; + } + } + constraints->over_current_detection = set[0]; + constraints->over_voltage_detection = set[1]; + constraints->over_temp_detection = set[2]; + constraints->under_voltage_detection = set[3]; +} + static int of_get_regulation_constraints(struct device *dev, struct device_node *np, struct regulator_init_data **init_data, @@ -188,6 +244,8 @@ static int of_get_regulation_constraints(struct device *dev, constraints->over_current_protection = of_property_read_bool(np, "regulator-over-current-protection"); + of_get_regulator_prot_limits(np, constraints); + for (i = 0; i < ARRAY_SIZE(regulator_states); i++) { switch (i) { case PM_SUSPEND_MEM: diff --git a/drivers/regulator/qcom-labibb-regulator.c b/drivers/regulator/qcom-labibb-regulator.c index de25e3279b4b..b3da0dc58782 100644 --- a/drivers/regulator/qcom-labibb-regulator.c +++ b/drivers/regulator/qcom-labibb-regulator.c @@ -307,13 +307,21 @@ end: return IRQ_HANDLED; } -static int qcom_labibb_set_ocp(struct regulator_dev *rdev) +static int qcom_labibb_set_ocp(struct regulator_dev *rdev, int lim, + int severity, bool enable) { struct labibb_regulator *vreg = rdev_get_drvdata(rdev); char *ocp_irq_name; u32 irq_flags = IRQF_ONESHOT; int irq_trig_low, ret; + /* + * labibb supports only protection - and does not support setting + * limit. Furthermore, we don't support disabling protection. + */ + if (lim || severity != REGULATOR_SEVERITY_PROT || !enable) + return -EINVAL; + /* If there is no OCP interrupt, there's nothing to set */ if (vreg->ocp_irq <= 0) return -EINVAL; diff --git a/drivers/regulator/qcom_spmi-regulator.c b/drivers/regulator/qcom_spmi-regulator.c index 95677c51c1fa..41424a3366d0 100644 --- a/drivers/regulator/qcom_spmi-regulator.c +++ b/drivers/regulator/qcom_spmi-regulator.c @@ -595,11 +595,15 @@ static int spmi_regulator_vs_enable(struct regulator_dev *rdev) return regulator_enable_regmap(rdev); } -static int spmi_regulator_vs_ocp(struct regulator_dev *rdev) +static int spmi_regulator_vs_ocp(struct regulator_dev *rdev, int lim_uA, + int severity, bool enable) { struct spmi_regulator *vreg = rdev_get_drvdata(rdev); u8 reg = SPMI_VS_OCP_OVERRIDE; + if (lim_uA || !enable || severity != REGULATOR_SEVERITY_PROT) + return -EINVAL; + return spmi_vreg_write(vreg, SPMI_VS_REG_OCP, ®, 1); } diff --git a/drivers/regulator/stpmic1_regulator.c b/drivers/regulator/stpmic1_regulator.c index cf10fdb72e32..2d7597c76e4a 100644 --- a/drivers/regulator/stpmic1_regulator.c +++ b/drivers/regulator/stpmic1_regulator.c @@ -32,7 +32,8 @@ struct stpmic1_regulator_cfg { static int stpmic1_set_mode(struct regulator_dev *rdev, unsigned int mode); static unsigned int stpmic1_get_mode(struct regulator_dev *rdev); -static int stpmic1_set_icc(struct regulator_dev *rdev); +static int stpmic1_set_icc(struct regulator_dev *rdev, int lim, int severity, + bool enable); static unsigned int stpmic1_map_mode(unsigned int mode); enum { @@ -491,11 +492,26 @@ static int stpmic1_set_mode(struct regulator_dev *rdev, unsigned int mode) STPMIC1_BUCK_MODE_LP, value); } -static int stpmic1_set_icc(struct regulator_dev *rdev) +static int stpmic1_set_icc(struct regulator_dev *rdev, int lim, int severity, + bool enable) { struct stpmic1_regulator_cfg *cfg = rdev_get_drvdata(rdev); struct regmap *regmap = rdev_get_regmap(rdev); + /* + * The code seems like one bit in a register controls whether OCP is + * enabled. So we might be able to turn it off here is if that + * was requested. I won't support this because I don't have the HW. + * Feel free to try and implement if you have the HW and need kernel + * to disable this. + * + * Also, I don't know if limit can be configured or if we support + * error/warning instead of protect. So I just keep existing logic + * and assume no. + */ + if (lim || severity != REGULATOR_SEVERITY_PROT || !enable) + return -EINVAL; + /* enable switch off in case of over current */ return regmap_update_bits(regmap, cfg->icc_reg, cfg->icc_mask, cfg->icc_mask); |