// SPDX-License-Identifier: GPL-2.0 // Copyright (c) 2018-2021, The Linux Foundation. All rights reserved. // Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. #define pr_fmt(fmt) "%s: " fmt, __func__ #include #include #include #include #include #include #include #include #include #include /** * enum rpmh_regulator_type - supported RPMh accelerator types * @VRM: RPMh VRM accelerator which supports voting on enable, voltage, * and mode of LDO, SMPS, and BOB type PMIC regulators. * @XOB: RPMh XOB accelerator which supports voting on the enable state * of PMIC regulators. */ enum rpmh_regulator_type { VRM, XOB, }; enum rpmh_regulator_mode { REGULATOR_MODE_RETENTION, REGULATOR_MODE_LPM, REGULATOR_MODE_AUTO, REGULATOR_MODE_HPM, }; #define RPMH_REGULATOR_REG_VRM_VOLTAGE 0x0 #define RPMH_REGULATOR_REG_ENABLE 0x4 #define RPMH_REGULATOR_REG_VRM_MODE 0x8 #define PMIC4_LDO_MODE_RETENTION 4 #define PMIC4_LDO_MODE_LPM 5 #define PMIC4_LDO_MODE_HPM 7 #define PMIC4_SMPS_MODE_RETENTION 4 #define PMIC4_SMPS_MODE_PFM 5 #define PMIC4_SMPS_MODE_AUTO 6 #define PMIC4_SMPS_MODE_PWM 7 #define PMIC4_BOB_MODE_PASS 0 #define PMIC4_BOB_MODE_PFM 1 #define PMIC4_BOB_MODE_AUTO 2 #define PMIC4_BOB_MODE_PWM 3 #define PMIC5_LDO_MODE_RETENTION 3 #define PMIC5_LDO_MODE_LPM 4 #define PMIC5_LDO_MODE_HPM 7 #define PMIC5_SMPS_MODE_RETENTION 3 #define PMIC5_SMPS_MODE_PFM 4 #define PMIC5_SMPS_MODE_AUTO 6 #define PMIC5_SMPS_MODE_PWM 7 #define PMIC5_BOB_MODE_PASS 2 #define PMIC5_BOB_MODE_PFM 4 #define PMIC5_BOB_MODE_AUTO 6 #define PMIC5_BOB_MODE_PWM 7 /** * struct linear_range - table of selector - value pairs * * Define a lookup-table for range of values. Intended to help when looking * for a register value matching certaing physical measure (like voltage). * Usable when increment of one in register always results a constant increment * of the physical measure (like voltage). * * @min: Lowest value in range * @min_sel: Lowest selector for range * @max_sel: Highest selector for range * @step: Value step size */ struct linear_range { unsigned int min; unsigned int min_sel; unsigned int max_sel; unsigned int step; }; /* Initialize struct linear_range for regulators */ #define REGULATOR_LINEAR_RANGE(_min_uV, _min_sel, _max_sel, _step_uV) \ { \ .min = _min_uV, \ .min_sel = _min_sel, \ .max_sel = _max_sel, \ .step = _step_uV, \ } /** * struct rpmh_vreg_hw_data - RPMh regulator hardware configurations * @regulator_type: RPMh accelerator type used to manage this * regulator * @ops: Pointer to regulator ops callback structure * @voltage_range: The single range of voltages supported by this * PMIC regulator type * @n_voltages: The number of unique voltage set points defined * by voltage_range * @hpm_min_load_uA: Minimum load current in microamps that requires * high power mode (HPM) operation. This is used * for LDO hardware type regulators only. * @pmic_mode_map: Array indexed by regulator framework mode * containing PMIC hardware modes. Must be large * enough to index all framework modes supported * by this regulator hardware type. * @of_map_mode: Maps an RPMH_REGULATOR_MODE_* mode value defined * in device tree to a regulator framework mode */ struct rpmh_vreg_hw_data { enum rpmh_regulator_type regulator_type; const struct dm_regulator_ops *ops; struct linear_range voltage_range; int n_voltages; int hpm_min_load_uA; struct dm_regulator_mode *pmic_mode_map; int n_modes; unsigned int (*of_map_mode)(unsigned int mode); }; /** * struct rpmh_vreg - individual RPMh regulator data structure encapsulating a * single regulator device * @dev: Device pointer for the top-level PMIC RPMh * regulator parent device. This is used as a * handle in RPMh write requests. * @addr: Base address of the regulator resource within * an RPMh accelerator * @rdesc: Regulator descriptor * @hw_data: PMIC regulator configuration data for this RPMh * regulator * @always_wait_for_ack: Boolean flag indicating if a request must always * wait for an ACK from RPMh before continuing even * if it corresponds to a strictly lower power * state (e.g. enabled --> disabled). * @enabled: Flag indicating if the regulator is enabled or * not * @bypassed: Boolean indicating if the regulator is in * bypass (pass-through) mode or not. This is * only used by BOB rpmh-regulator resources. * @uv: Selector used for get_voltage_sel() and * set_value() callbacks * @mode: RPMh VRM regulator current framework mode */ struct rpmh_vreg { struct udevice *dev; u32 addr; const struct rpmh_vreg_hw_data *hw_data; bool always_wait_for_ack; int enabled; bool bypassed; int uv; int mode; }; /** * struct rpmh_vreg_init_data - initialization data for an RPMh regulator * @name: Name for the regulator which also corresponds * to the device tree subnode name of the regulator * @resource_name: RPMh regulator resource name format string. * This must include exactly one field: '%s' which * is filled at run-time with the PMIC ID provided * by device tree property qcom,pmic-id. Example: * "ldo%s1" for RPMh resource "ldoa1". * @supply_name: Parent supply regulator name * @hw_data: Configuration data for this PMIC regulator type */ struct rpmh_vreg_init_data { const char *name; const char *resource_name; const char *supply_name; const struct rpmh_vreg_hw_data *hw_data; }; /** * rpmh_regulator_send_request() - send the request to RPMh * @vreg: Pointer to the RPMh regulator * @cmd: Pointer to the RPMh command to send * @wait_for_ack: Boolean indicating if execution must wait until the * request has been acknowledged as complete * * Return: 0 on success, errno on failure */ static int rpmh_regulator_send_request(struct rpmh_vreg *vreg, const struct tcs_cmd *cmd, bool wait_for_ack) { int ret; if (wait_for_ack || vreg->always_wait_for_ack) ret = rpmh_write(vreg->dev->parent, RPMH_ACTIVE_ONLY_STATE, cmd, 1); else ret = rpmh_write_async(vreg->dev->parent, RPMH_ACTIVE_ONLY_STATE, cmd, 1); return ret; } static int _rpmh_regulator_vrm_set_value(struct udevice *rdev, int uv, bool wait_for_ack) { struct rpmh_vreg *vreg = dev_get_priv(rdev); struct tcs_cmd cmd = { .addr = vreg->addr + RPMH_REGULATOR_REG_VRM_VOLTAGE, }; int ret; unsigned int selector; selector = (uv - vreg->hw_data->voltage_range.min) / vreg->hw_data->voltage_range.step; cmd.data = DIV_ROUND_UP(vreg->hw_data->voltage_range.min + selector * vreg->hw_data->voltage_range.step, 1000); ret = rpmh_regulator_send_request(vreg, &cmd, wait_for_ack); if (!ret) vreg->uv = cmd.data * 1000; return ret; } static int rpmh_regulator_vrm_set_value(struct udevice *rdev, int uv) { struct rpmh_vreg *vreg = dev_get_priv(rdev); debug("%s: set_value %d (current %d)\n", rdev->name, uv, vreg->uv); if (vreg->enabled == -EINVAL) { /* * Cache the voltage and send it later when the regulator is * enabled or disabled. */ vreg->uv = uv; return 0; } return _rpmh_regulator_vrm_set_value(rdev, uv, uv > vreg->uv); } static int rpmh_regulator_vrm_get_value(struct udevice *rdev) { struct rpmh_vreg *vreg = dev_get_priv(rdev); debug("%s: get_value %d\n", rdev->name, vreg->uv); return vreg->uv; } static int rpmh_regulator_is_enabled(struct udevice *rdev) { struct rpmh_vreg *vreg = dev_get_priv(rdev); debug("%s: is_enabled %d\n", rdev->name, vreg->enabled); return vreg->enabled > 0; } static int rpmh_regulator_set_enable_state(struct udevice *rdev, bool enable) { struct rpmh_vreg *vreg = dev_get_priv(rdev); struct tcs_cmd cmd = { .addr = vreg->addr + RPMH_REGULATOR_REG_ENABLE, .data = enable, }; int ret; debug("%s: set_enable %d (current %d)\n", rdev->name, enable, vreg->enabled); if (vreg->enabled == -EINVAL && vreg->uv != -ENOTRECOVERABLE) { ret = _rpmh_regulator_vrm_set_value(rdev, vreg->uv, true); if (ret < 0) return ret; } ret = rpmh_regulator_send_request(vreg, &cmd, enable); if (!ret) vreg->enabled = enable; return ret; } static int rpmh_regulator_vrm_set_mode_bypass(struct rpmh_vreg *vreg, unsigned int mode, bool bypassed) { struct tcs_cmd cmd = { .addr = vreg->addr + RPMH_REGULATOR_REG_VRM_MODE, }; struct dm_regulator_mode *pmic_mode; int i; if (mode > REGULATOR_MODE_HPM) return -EINVAL; for (i = 0; i < vreg->hw_data->n_modes; i++) { pmic_mode = &vreg->hw_data->pmic_mode_map[i]; if (pmic_mode->id == mode) break; } if (pmic_mode->id != mode) { printf("Invalid mode %d\n", mode); return -EINVAL; } if (bypassed) cmd.data = PMIC4_BOB_MODE_PASS; else cmd.data = pmic_mode->id; return rpmh_regulator_send_request(vreg, &cmd, true); } static int rpmh_regulator_vrm_set_mode(struct udevice *rdev, int mode) { struct rpmh_vreg *vreg = dev_get_priv(rdev); int ret; debug("%s: set_mode %d (current %d)\n", rdev->name, mode, vreg->mode); if (mode == vreg->mode) return 0; ret = rpmh_regulator_vrm_set_mode_bypass(vreg, mode, vreg->bypassed); if (!ret) vreg->mode = mode; return ret; } static int rpmh_regulator_vrm_get_mode(struct udevice *rdev) { struct rpmh_vreg *vreg = dev_get_priv(rdev); debug("%s: get_mode %d\n", rdev->name, vreg->mode); return vreg->mode; } static const struct dm_regulator_ops rpmh_regulator_vrm_drms_ops = { .get_value = rpmh_regulator_vrm_get_value, .set_value = rpmh_regulator_vrm_set_value, .set_enable = rpmh_regulator_set_enable_state, .get_enable = rpmh_regulator_is_enabled, .set_mode = rpmh_regulator_vrm_set_mode, .get_mode = rpmh_regulator_vrm_get_mode, }; static struct dm_regulator_mode pmic_mode_map_pmic5_bob[] = { { .id = REGULATOR_MODE_LPM, .register_value = PMIC5_BOB_MODE_PFM, .name = "PMIC5_BOB_MODE_PFM" }, { .id = REGULATOR_MODE_AUTO, .register_value = PMIC5_BOB_MODE_AUTO, .name = "PMIC5_BOB_MODE_AUTO" }, { .id = REGULATOR_MODE_HPM, .register_value = PMIC5_BOB_MODE_PWM, .name = "PMIC5_BOB_MODE_PWM" }, }; static struct dm_regulator_mode pmic_mode_map_pmic5_smps[] = { { .id = REGULATOR_MODE_RETENTION, .register_value = PMIC5_SMPS_MODE_RETENTION, .name = "PMIC5_SMPS_MODE_RETENTION" }, { .id = REGULATOR_MODE_LPM, .register_value = PMIC5_SMPS_MODE_PFM, .name = "PMIC5_SMPS_MODE_PFM" }, { .id = REGULATOR_MODE_AUTO, .register_value = PMIC5_SMPS_MODE_AUTO, .name = "PMIC5_SMPS_MODE_AUTO" }, { .id = REGULATOR_MODE_HPM, .register_value = PMIC5_SMPS_MODE_PWM, .name = "PMIC5_SMPS_MODE_PWM" }, }; static const struct rpmh_vreg_hw_data pmic5_bob = { .regulator_type = VRM, .ops = &rpmh_regulator_vrm_drms_ops, .voltage_range = REGULATOR_LINEAR_RANGE(3000000, 0, 31, 32000), .n_voltages = 32, .pmic_mode_map = pmic_mode_map_pmic5_bob, .n_modes = ARRAY_SIZE(pmic_mode_map_pmic5_bob), }; static const struct rpmh_vreg_hw_data pmic5_ftsmps525_lv = { .regulator_type = VRM, .ops = &rpmh_regulator_vrm_drms_ops, .voltage_range = REGULATOR_LINEAR_RANGE(300000, 0, 267, 4000), .n_voltages = 268, .pmic_mode_map = pmic_mode_map_pmic5_smps, .n_modes = ARRAY_SIZE(pmic_mode_map_pmic5_smps), }; static const struct rpmh_vreg_hw_data pmic5_ftsmps525_mv = { .regulator_type = VRM, .ops = &rpmh_regulator_vrm_drms_ops, .voltage_range = REGULATOR_LINEAR_RANGE(600000, 0, 267, 8000), .n_voltages = 268, .pmic_mode_map = pmic_mode_map_pmic5_smps, .n_modes = ARRAY_SIZE(pmic_mode_map_pmic5_smps), }; static struct dm_regulator_mode pmic_mode_map_pmic5_ldo[] = { { .id = REGULATOR_MODE_RETENTION, .register_value = PMIC5_LDO_MODE_RETENTION, .name = "PMIC5_LDO_MODE_RETENTION" }, { .id = REGULATOR_MODE_LPM, .register_value = PMIC5_LDO_MODE_LPM, .name = "PMIC5_LDO_MODE_LPM" }, { .id = REGULATOR_MODE_HPM, .register_value = PMIC5_LDO_MODE_HPM, .name = "PMIC5_LDO_MODE_HPM" }, }; static const struct rpmh_vreg_hw_data pmic5_pldo = { .regulator_type = VRM, .ops = &rpmh_regulator_vrm_drms_ops, .voltage_range = REGULATOR_LINEAR_RANGE(1504000, 0, 255, 8000), .n_voltages = 256, .hpm_min_load_uA = 10000, .pmic_mode_map = pmic_mode_map_pmic5_ldo, .n_modes = ARRAY_SIZE(pmic_mode_map_pmic5_ldo), }; static const struct rpmh_vreg_hw_data pmic5_pldo_lv = { .regulator_type = VRM, .ops = &rpmh_regulator_vrm_drms_ops, .voltage_range = REGULATOR_LINEAR_RANGE(1504000, 0, 62, 8000), .n_voltages = 63, .hpm_min_load_uA = 10000, .pmic_mode_map = pmic_mode_map_pmic5_ldo, .n_modes = ARRAY_SIZE(pmic_mode_map_pmic5_ldo), }; static const struct rpmh_vreg_hw_data pmic5_nldo515 = { .regulator_type = VRM, .ops = &rpmh_regulator_vrm_drms_ops, .voltage_range = REGULATOR_LINEAR_RANGE(320000, 0, 210, 8000), .n_voltages = 211, .hpm_min_load_uA = 30000, .pmic_mode_map = pmic_mode_map_pmic5_ldo, .n_modes = ARRAY_SIZE(pmic_mode_map_pmic5_ldo), }; #define RPMH_VREG(_name, _resource_name, _hw_data, _supply_name) \ { \ .name = _name, \ .resource_name = _resource_name, \ .hw_data = _hw_data, \ .supply_name = _supply_name, \ } static const struct rpmh_vreg_init_data pm8150_vreg_data[] = { RPMH_VREG("ldo13", "ldo%s13", &pmic5_pldo, "vdd-l13-l16-l17"), {} }; static const struct rpmh_vreg_init_data pm8150l_vreg_data[] = { RPMH_VREG("ldo1", "ldo%s1", &pmic5_pldo_lv, "vdd-l1-l8"), RPMH_VREG("ldo11", "ldo%s11", &pmic5_pldo, "vdd-l7-l11"), {} }; static const struct rpmh_vreg_init_data pm8550_vreg_data[] = { RPMH_VREG("ldo1", "ldo%s1", &pmic5_nldo515, "vdd-l1-l4-l10"), RPMH_VREG("ldo2", "ldo%s2", &pmic5_pldo, "vdd-l2-l13-l14"), RPMH_VREG("ldo3", "ldo%s3", &pmic5_nldo515, "vdd-l3"), RPMH_VREG("ldo4", "ldo%s4", &pmic5_nldo515, "vdd-l1-l4-l10"), RPMH_VREG("ldo5", "ldo%s5", &pmic5_pldo, "vdd-l5-l16"), RPMH_VREG("ldo6", "ldo%s6", &pmic5_pldo, "vdd-l6-l7"), RPMH_VREG("ldo7", "ldo%s7", &pmic5_pldo, "vdd-l6-l7"), RPMH_VREG("ldo8", "ldo%s8", &pmic5_pldo, "vdd-l8-l9"), RPMH_VREG("ldo9", "ldo%s9", &pmic5_pldo, "vdd-l8-l9"), RPMH_VREG("ldo10", "ldo%s10", &pmic5_nldo515, "vdd-l1-l4-l10"), RPMH_VREG("ldo11", "ldo%s11", &pmic5_nldo515, "vdd-l11"), RPMH_VREG("ldo12", "ldo%s12", &pmic5_nldo515, "vdd-l12"), RPMH_VREG("ldo13", "ldo%s13", &pmic5_pldo, "vdd-l2-l13-l14"), RPMH_VREG("ldo14", "ldo%s14", &pmic5_pldo, "vdd-l2-l13-l14"), RPMH_VREG("ldo15", "ldo%s15", &pmic5_nldo515, "vdd-l15"), RPMH_VREG("ldo16", "ldo%s16", &pmic5_pldo, "vdd-l5-l16"), RPMH_VREG("ldo17", "ldo%s17", &pmic5_pldo, "vdd-l17"), RPMH_VREG("bob1", "bob%s1", &pmic5_bob, "vdd-bob1"), RPMH_VREG("bob2", "bob%s2", &pmic5_bob, "vdd-bob2"), {} }; static const struct rpmh_vreg_init_data pm8550vs_vreg_data[] = { RPMH_VREG("smps1", "smp%s1", &pmic5_ftsmps525_lv, "vdd-s1"), RPMH_VREG("smps2", "smp%s2", &pmic5_ftsmps525_lv, "vdd-s2"), RPMH_VREG("smps3", "smp%s3", &pmic5_ftsmps525_lv, "vdd-s3"), RPMH_VREG("smps4", "smp%s4", &pmic5_ftsmps525_lv, "vdd-s4"), RPMH_VREG("smps5", "smp%s5", &pmic5_ftsmps525_lv, "vdd-s5"), RPMH_VREG("smps6", "smp%s6", &pmic5_ftsmps525_mv, "vdd-s6"), RPMH_VREG("ldo1", "ldo%s1", &pmic5_nldo515, "vdd-l1"), RPMH_VREG("ldo2", "ldo%s2", &pmic5_nldo515, "vdd-l2"), RPMH_VREG("ldo3", "ldo%s3", &pmic5_nldo515, "vdd-l3"), {} }; static const struct rpmh_vreg_init_data pm8550ve_vreg_data[] = { RPMH_VREG("smps1", "smp%s1", &pmic5_ftsmps525_lv, "vdd-s1"), RPMH_VREG("smps2", "smp%s2", &pmic5_ftsmps525_lv, "vdd-s2"), RPMH_VREG("smps3", "smp%s3", &pmic5_ftsmps525_lv, "vdd-s3"), RPMH_VREG("smps4", "smp%s4", &pmic5_ftsmps525_mv, "vdd-s4"), RPMH_VREG("smps5", "smp%s5", &pmic5_ftsmps525_lv, "vdd-s5"), RPMH_VREG("smps6", "smp%s6", &pmic5_ftsmps525_lv, "vdd-s6"), RPMH_VREG("smps7", "smp%s7", &pmic5_ftsmps525_lv, "vdd-s7"), RPMH_VREG("smps8", "smp%s8", &pmic5_ftsmps525_lv, "vdd-s8"), RPMH_VREG("ldo1", "ldo%s1", &pmic5_nldo515, "vdd-l1"), RPMH_VREG("ldo2", "ldo%s2", &pmic5_nldo515, "vdd-l2"), RPMH_VREG("ldo3", "ldo%s3", &pmic5_nldo515, "vdd-l3"), {} }; /* probe an individual regulator */ static int rpmh_regulator_probe(struct udevice *dev) { const struct rpmh_vreg_init_data *init_data; struct rpmh_vreg *priv; struct dm_regulator_uclass_plat *plat_data; init_data = (const struct rpmh_vreg_init_data *)dev_get_driver_data(dev); priv = dev_get_priv(dev); plat_data = dev_get_uclass_plat(dev); priv->dev = dev; priv->addr = cmd_db_read_addr(dev->name); if (!priv->addr) { dev_err(dev, "Failed to read RPMh address for %s\n", dev->name); return -ENODEV; } priv->hw_data = init_data->hw_data; priv->enabled = -EINVAL; priv->uv = -ENOTRECOVERABLE; if (ofnode_read_u32(dev_ofnode(dev), "regulator-initial-mode", &priv->mode)) priv->mode = -EINVAL; plat_data->mode = priv->hw_data->pmic_mode_map; plat_data->mode_count = priv->hw_data->n_modes; return 0; } /* for non-drm, xob, or bypass regulators add additional driver definitions */ U_BOOT_DRIVER(rpmh_regulator_drm) = { .name = "rpmh_regulator_drm", .id = UCLASS_REGULATOR, .probe = rpmh_regulator_probe, .priv_auto = sizeof(struct rpmh_vreg), .ops = &rpmh_regulator_vrm_drms_ops, }; /* This driver intentionally only supports a subset of the available regulators. * This function checks to see if a given regulator node in DT matches a regulator * defined in the driver. */ static const struct rpmh_vreg_init_data * vreg_get_init_data(const struct rpmh_vreg_init_data *init_data, ofnode node) { const struct rpmh_vreg_init_data *data; for (data = init_data; data->name; data++) { if (!strcmp(data->name, ofnode_get_name(node))) return data; } return NULL; } static int rpmh_regulators_bind(struct udevice *dev) { const struct rpmh_vreg_init_data *init_data, *data; const char *pmic_id; char *name; struct driver *drv; ofnode node; int ret; size_t namelen; init_data = (const struct rpmh_vreg_init_data *)dev_get_driver_data(dev); if (!init_data) { dev_err(dev, "No RPMh regulator init data\n"); return -ENODEV; } pmic_id = ofnode_read_string(dev_ofnode(dev), "qcom,pmic-id"); if (!pmic_id) { dev_err(dev, "No PMIC ID\n"); return -ENODEV; } drv = lists_driver_lookup_name("rpmh_regulator_drm"); ofnode_for_each_subnode(node, dev_ofnode(dev)) { data = vreg_get_init_data(init_data, node); if (!data) continue; /* %s is replaced with pmic_id, so subtract 2, then add 1 for the null terminator */ namelen = strlen(data->resource_name) + strlen(pmic_id) - 1; name = devm_kzalloc(dev, namelen, GFP_KERNEL); ret = snprintf(name, namelen, data->resource_name, pmic_id); if (ret < 0 || ret >= namelen) { dev_err(dev, "Failed to create RPMh regulator name\n"); return -ENOMEM; } ret = device_bind_with_driver_data(dev, drv, name, (ulong)data, node, NULL); if (ret < 0) { dev_err(dev, "Failed to bind RPMh regulator %s: %d\n", name, ret); return ret; } } return 0; } static const struct udevice_id rpmh_regulator_ids[] = { { .compatible = "qcom,pm8150-rpmh-regulators", .data = (ulong)pm8150_vreg_data, }, { .compatible = "qcom,pm8150l-rpmh-regulators", .data = (ulong)pm8150l_vreg_data, }, { .compatible = "qcom,pm8550-rpmh-regulators", .data = (ulong)pm8550_vreg_data, }, { .compatible = "qcom,pm8550ve-rpmh-regulators", .data = (ulong)pm8550ve_vreg_data, }, { .compatible = "qcom,pm8550vs-rpmh-regulators", .data = (ulong)pm8550vs_vreg_data, }, { /* sentinal */ }, }; /* Driver for a 'bank' of regulators. This creates devices for each * individual regulator */ U_BOOT_DRIVER(rpmh_regulators) = { .name = "rpmh_regulators", .id = UCLASS_MISC, .bind = rpmh_regulators_bind, .of_match = rpmh_regulator_ids, .ops = &rpmh_regulator_vrm_drms_ops, }; MODULE_DESCRIPTION("Qualcomm RPMh regulator driver"); MODULE_LICENSE("GPL v2");