| /* |
| * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only version 2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #define pr_fmt(fmt) "AMOLED: %s: " fmt, __func__ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/of_address.h> |
| #include <linux/platform_device.h> |
| #include <linux/regmap.h> |
| #include <linux/regulator/driver.h> |
| #include <linux/regulator/of_regulator.h> |
| #include <linux/regulator/machine.h> |
| |
| #define QPNP_AMOLED_REGULATOR_DRIVER_NAME "qcom,qpnp-amoled-regulator" |
| |
| /* Register definitions */ |
| |
| #define PERIPH_TYPE 0x04 |
| #define IBB_PERIPH_TYPE 0x20 |
| #define AB_PERIPH_TYPE 0x24 |
| #define OLEDB_PERIPH_TYPE 0x2C |
| |
| /* AB */ |
| #define AB_STATUS1(chip) (chip->ab_base + 0x08) |
| #define AB_LDO_SW_DBG_CTL(chip) (chip->ab_base + 0x72) |
| #define AB_LDO_PD_CTL(chip) (chip->ab_base + 0x78) |
| |
| /* AB_STATUS1 */ |
| #define VREG_OK_BIT BIT(6) |
| #define VREG_OK_SHIFT 6 |
| |
| /* AB_LDO_PD_CTL */ |
| #define PULLDN_EN_BIT BIT(7) |
| |
| /* IBB */ |
| #define IBB_PD_CTL(chip) (chip->ibb_base + 0x47) |
| #define IBB_PS_CTL(chip) (chip->ibb_base + 0x50) |
| #define IBB_NLIMIT_DAC(chip) (chip->ibb_base + 0x61) |
| #define IBB_SMART_PS_CTL(chip) (chip->ibb_base + 0x65) |
| |
| /* IBB_PD_CTL */ |
| #define ENABLE_PD_BIT BIT(7) |
| |
| /* OLEDB */ |
| #define OLEDB_VOUT_PGM(chip) (chip->oledb_base + 0x49) |
| #define OLEDB_VOUT_DEFAULT(chip) (chip->oledb_base + 0x4A) |
| |
| struct amoled_regulator { |
| struct regulator_desc rdesc; |
| struct regulator_dev *rdev; |
| struct device_node *node; |
| unsigned int mode; |
| bool enabled; |
| }; |
| |
| struct oledb_regulator { |
| struct amoled_regulator vreg; |
| |
| /* DT params */ |
| bool swire_control; |
| bool vout_override; |
| }; |
| |
| struct ab_regulator { |
| struct amoled_regulator vreg; |
| |
| /* DT params */ |
| bool swire_control; |
| bool pd_control; |
| }; |
| |
| struct ibb_regulator { |
| struct amoled_regulator vreg; |
| |
| /* DT params */ |
| bool swire_control; |
| bool pd_control; |
| }; |
| |
| struct qpnp_amoled { |
| struct device *dev; |
| struct regmap *regmap; |
| struct oledb_regulator oledb; |
| struct ab_regulator ab; |
| struct ibb_regulator ibb; |
| struct delayed_work vout_work; |
| struct workqueue_struct *wq; |
| |
| /* DT params */ |
| u32 oledb_base; |
| u32 ab_base; |
| u32 ibb_base; |
| }; |
| |
| enum reg_type { |
| OLEDB, |
| AB, |
| IBB, |
| }; |
| |
| int qpnp_amoled_read(struct qpnp_amoled *chip, |
| u16 addr, u8 *value, u8 count) |
| { |
| int rc = 0; |
| |
| rc = regmap_bulk_read(chip->regmap, addr, value, count); |
| if (rc < 0) |
| pr_err("Failed to read from addr=0x%02x rc=%d\n", addr, rc); |
| |
| return rc; |
| } |
| |
| static int qpnp_amoled_write(struct qpnp_amoled *chip, |
| u16 addr, u8 *value, u8 count) |
| { |
| int rc; |
| |
| rc = regmap_bulk_write(chip->regmap, addr, value, count); |
| if (rc < 0) |
| pr_err("Failed to write to addr=0x%02x rc=%d\n", addr, rc); |
| |
| return rc; |
| } |
| |
| static int qpnp_amoled_masked_write(struct qpnp_amoled *chip, |
| u16 addr, u8 mask, u8 value) |
| { |
| int rc = 0; |
| |
| rc = regmap_update_bits(chip->regmap, addr, mask, value); |
| if (rc < 0) |
| pr_err("Failed to write addr=0x%02x value=0x%02x rc=%d\n", |
| addr, value, rc); |
| |
| return rc; |
| } |
| |
| /* AB regulator */ |
| |
| static int qpnp_ab_regulator_is_enabled(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| return chip->ab.vreg.enabled; |
| } |
| |
| static int qpnp_ab_regulator_enable(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| chip->ab.vreg.enabled = true; |
| return 0; |
| } |
| |
| static int qpnp_ab_regulator_disable(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| chip->ab.vreg.enabled = false; |
| return 0; |
| } |
| |
| /* IBB regulator */ |
| |
| static int qpnp_ibb_regulator_is_enabled(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| return chip->ibb.vreg.enabled; |
| } |
| |
| static int qpnp_ibb_regulator_enable(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| chip->ibb.vreg.enabled = true; |
| return 0; |
| } |
| |
| static int qpnp_ibb_regulator_disable(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| chip->ibb.vreg.enabled = false; |
| return 0; |
| } |
| |
| /* common to AB and IBB */ |
| |
| static int qpnp_ab_ibb_regulator_set_voltage(struct regulator_dev *rdev, |
| int min_uV, int max_uV, unsigned int *selector) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| /* HW controlled */ |
| if (chip->ab.swire_control || chip->ibb.swire_control) |
| return 0; |
| |
| return 0; |
| } |
| |
| static int qpnp_ab_ibb_regulator_get_voltage(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| /* HW controlled */ |
| if (chip->ab.swire_control || chip->ibb.swire_control) |
| return 0; |
| |
| return 0; |
| } |
| |
| static int qpnp_ab_pd_control(struct qpnp_amoled *chip, bool en) |
| { |
| u8 val = en ? PULLDN_EN_BIT : 0; |
| |
| return qpnp_amoled_write(chip, AB_LDO_PD_CTL(chip), &val, 1); |
| } |
| |
| static int qpnp_ibb_pd_control(struct qpnp_amoled *chip, bool en) |
| { |
| u8 val = en ? ENABLE_PD_BIT : 0; |
| |
| return qpnp_amoled_masked_write(chip, IBB_PD_CTL(chip), ENABLE_PD_BIT, |
| val); |
| } |
| |
| static int qpnp_amoled_pd_control(struct qpnp_amoled *chip, bool en) |
| { |
| if (chip->ibb.pd_control) { |
| const int rc = qpnp_ibb_pd_control(chip, en); |
| if (rc < 0) |
| return rc; |
| } |
| |
| if (chip->ab.pd_control) { |
| const int rc = qpnp_ab_pd_control(chip, en); |
| if (rc < 0) |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| static void qpnp_amoled_vout_override_work(struct work_struct *work) |
| { |
| const struct delayed_work *dw = to_delayed_work(work); |
| struct qpnp_amoled *chip = container_of(dw, struct qpnp_amoled, |
| vout_work); |
| u8 default_vout, current_vout; |
| int rc; |
| |
| rc = qpnp_amoled_read(chip, OLEDB_VOUT_DEFAULT(chip), &default_vout, 1); |
| if (rc) { |
| pr_warn("Unable to read default vout\n"); |
| return; |
| } |
| |
| rc = qpnp_amoled_read(chip, OLEDB_VOUT_PGM(chip), ¤t_vout, 1); |
| if (rc) { |
| pr_warn("Unable to read current vout\n"); |
| return; |
| } |
| |
| if (current_vout != default_vout) { |
| pr_warn("Current voltage (0x%X) doesn't match default (0x%X)\n", |
| current_vout, default_vout); |
| |
| rc = qpnp_amoled_write(chip, OLEDB_VOUT_PGM(chip), |
| &default_vout, 1); |
| if (rc) |
| pr_warn("Unable to program voltage\n"); |
| } else { |
| pr_debug("Voltage check successful (0x%X)\n", current_vout); |
| } |
| } |
| |
| static int qpnp_ab_ibb_regulator_set_mode(struct regulator_dev *rdev, |
| unsigned int mode) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| int rc; |
| |
| if (mode != REGULATOR_MODE_NORMAL && mode != REGULATOR_MODE_STANDBY && |
| mode != REGULATOR_MODE_IDLE) { |
| pr_err("Unsupported mode %u\n", mode); |
| return -EINVAL; |
| } |
| |
| if (mode == chip->ab.vreg.mode || mode == chip->ibb.vreg.mode) |
| return 0; |
| pr_debug("mode: %d\n", mode); |
| |
| if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_STANDBY) { |
| rc = qpnp_amoled_pd_control(chip, true); |
| } else if (mode == REGULATOR_MODE_IDLE) { |
| rc = qpnp_amoled_pd_control(chip, false); |
| } |
| |
| if (!rc) |
| chip->ab.vreg.mode = chip->ibb.vreg.mode = mode; |
| else |
| pr_err("Failed to configure for mode %d\n", mode); |
| |
| if (chip->oledb.vout_override) { |
| cancel_delayed_work_sync(&chip->vout_work); |
| if (mode != REGULATOR_MODE_STANDBY) { |
| const unsigned int delay = msecs_to_jiffies(150); |
| |
| queue_delayed_work(chip->wq, &chip->vout_work, delay); |
| } |
| } |
| return 0; |
| } |
| |
| static unsigned int qpnp_ab_ibb_regulator_get_mode(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| return chip->ibb.vreg.mode; |
| } |
| |
| static struct regulator_ops qpnp_amoled_ab_ops = { |
| .enable = qpnp_ab_regulator_enable, |
| .disable = qpnp_ab_regulator_disable, |
| .is_enabled = qpnp_ab_regulator_is_enabled, |
| .set_voltage = qpnp_ab_ibb_regulator_set_voltage, |
| .get_voltage = qpnp_ab_ibb_regulator_get_voltage, |
| .set_mode = qpnp_ab_ibb_regulator_set_mode, |
| .get_mode = qpnp_ab_ibb_regulator_get_mode, |
| }; |
| |
| static struct regulator_ops qpnp_amoled_ibb_ops = { |
| .enable = qpnp_ibb_regulator_enable, |
| .disable = qpnp_ibb_regulator_disable, |
| .is_enabled = qpnp_ibb_regulator_is_enabled, |
| .set_voltage = qpnp_ab_ibb_regulator_set_voltage, |
| .get_voltage = qpnp_ab_ibb_regulator_get_voltage, |
| .set_mode = qpnp_ab_ibb_regulator_set_mode, |
| .get_mode = qpnp_ab_ibb_regulator_get_mode, |
| }; |
| |
| /* OLEDB regulator */ |
| |
| static int qpnp_oledb_regulator_is_enabled(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| return chip->oledb.vreg.enabled; |
| } |
| |
| static int qpnp_oledb_regulator_enable(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| chip->oledb.vreg.enabled = true; |
| return 0; |
| } |
| |
| static int qpnp_oledb_regulator_disable(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| chip->oledb.vreg.enabled = false; |
| return 0; |
| } |
| |
| static int qpnp_oledb_regulator_set_voltage(struct regulator_dev *rdev, |
| int min_uV, int max_uV, unsigned int *selector) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| /* HW controlled */ |
| if (chip->oledb.swire_control) |
| return 0; |
| |
| return 0; |
| } |
| |
| static int qpnp_oledb_regulator_get_voltage(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| /* HW controlled */ |
| if (chip->oledb.swire_control) |
| return 0; |
| |
| return 0; |
| } |
| |
| static int qpnp_oledb_regulator_set_mode(struct regulator_dev *rdev, |
| unsigned int mode) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| chip->oledb.vreg.mode = mode; |
| return 0; |
| } |
| |
| static unsigned int qpnp_oledb_regulator_get_mode(struct regulator_dev *rdev) |
| { |
| struct qpnp_amoled *chip = rdev_get_drvdata(rdev); |
| |
| return chip->oledb.vreg.mode; |
| } |
| |
| static struct regulator_ops qpnp_amoled_oledb_ops = { |
| .enable = qpnp_oledb_regulator_enable, |
| .disable = qpnp_oledb_regulator_disable, |
| .is_enabled = qpnp_oledb_regulator_is_enabled, |
| .set_voltage = qpnp_oledb_regulator_set_voltage, |
| .get_voltage = qpnp_oledb_regulator_get_voltage, |
| .set_mode = qpnp_oledb_regulator_set_mode, |
| .get_mode = qpnp_oledb_regulator_get_mode, |
| }; |
| |
| static int qpnp_amoled_regulator_register(struct qpnp_amoled *chip, |
| enum reg_type type) |
| { |
| int rc = 0; |
| struct regulator_init_data *init_data; |
| struct regulator_config cfg = {}; |
| struct regulator_desc *rdesc; |
| struct regulator_dev *rdev; |
| struct device_node *node; |
| |
| if (type == OLEDB) { |
| node = chip->oledb.vreg.node; |
| rdesc = &chip->oledb.vreg.rdesc; |
| rdesc->ops = &qpnp_amoled_oledb_ops; |
| rdev = chip->oledb.vreg.rdev; |
| } else if (type == AB) { |
| node = chip->ab.vreg.node; |
| rdesc = &chip->ab.vreg.rdesc; |
| rdesc->ops = &qpnp_amoled_ab_ops; |
| rdev = chip->ab.vreg.rdev; |
| } else if (type == IBB) { |
| node = chip->ibb.vreg.node; |
| rdesc = &chip->ibb.vreg.rdesc; |
| rdesc->ops = &qpnp_amoled_ibb_ops; |
| rdev = chip->ibb.vreg.rdev; |
| } else { |
| pr_err("Invalid regulator type %d\n", type); |
| return -EINVAL; |
| } |
| |
| init_data = of_get_regulator_init_data(chip->dev, node, rdesc); |
| if (!init_data) { |
| pr_err("Failed to get regulator_init_data for type %d\n", type); |
| return -ENOMEM; |
| } |
| |
| if (init_data->constraints.name) { |
| rdesc->owner = THIS_MODULE; |
| rdesc->type = REGULATOR_VOLTAGE; |
| rdesc->name = init_data->constraints.name; |
| |
| cfg.dev = chip->dev; |
| cfg.init_data = init_data; |
| cfg.driver_data = chip; |
| cfg.of_node = node; |
| |
| if (of_get_property(chip->dev->of_node, "parent-supply", |
| NULL)) |
| init_data->supply_regulator = "parent"; |
| |
| init_data->constraints.valid_ops_mask |
| |= REGULATOR_CHANGE_VOLTAGE |
| | REGULATOR_CHANGE_STATUS |
| | REGULATOR_CHANGE_MODE; |
| init_data->constraints.valid_modes_mask |
| |= REGULATOR_MODE_NORMAL | REGULATOR_MODE_IDLE |
| | REGULATOR_MODE_STANDBY; |
| |
| rdev = devm_regulator_register(chip->dev, rdesc, &cfg); |
| if (IS_ERR(rdev)) { |
| rc = PTR_ERR(rdev); |
| rdev = NULL; |
| pr_err("Failed to register amoled regulator for type %d rc = %d\n", |
| type, rc); |
| return rc; |
| } |
| |
| if (type == OLEDB) |
| chip->oledb.vreg.mode = REGULATOR_MODE_NORMAL; |
| else if (type == IBB) |
| chip->ibb.vreg.mode = REGULATOR_MODE_NORMAL; |
| else |
| chip->ab.vreg.mode = REGULATOR_MODE_NORMAL; |
| } else { |
| pr_err("regulator name missing for type %d\n", type); |
| return -EINVAL; |
| } |
| |
| return rc; |
| } |
| |
| static int qpnp_amoled_hw_init(struct qpnp_amoled *chip) |
| { |
| int rc; |
| |
| rc = qpnp_amoled_regulator_register(chip, OLEDB); |
| if (rc < 0) { |
| dev_err(chip->dev, "Failed to register OLEDB regulator rc=%d\n", |
| rc); |
| return rc; |
| } |
| |
| rc = qpnp_amoled_regulator_register(chip, AB); |
| if (rc < 0) { |
| dev_err(chip->dev, "Failed to register AB regulator rc=%d\n", |
| rc); |
| return rc; |
| } |
| |
| rc = qpnp_amoled_regulator_register(chip, IBB); |
| if (rc < 0) { |
| dev_err(chip->dev, "Failed to register IBB regulator rc=%d\n", |
| rc); |
| return rc; |
| } |
| |
| return 0; |
| } |
| |
| static int qpnp_amoled_parse_dt(struct qpnp_amoled *chip) |
| { |
| struct device_node *temp, *node = chip->dev->of_node; |
| const __be32 *prop_addr; |
| int rc = 0; |
| u32 base, val; |
| |
| for_each_available_child_of_node(node, temp) { |
| prop_addr = of_get_address(temp, 0, NULL, NULL); |
| if (!prop_addr) { |
| pr_err("Couldn't get reg address\n"); |
| return -EINVAL; |
| } |
| |
| base = be32_to_cpu(*prop_addr); |
| rc = regmap_read(chip->regmap, base + PERIPH_TYPE, &val); |
| if (rc < 0) { |
| pr_err("Couldn't read PERIPH_TYPE for base %x\n", base); |
| return rc; |
| } |
| |
| switch (val) { |
| case OLEDB_PERIPH_TYPE: |
| chip->oledb_base = base; |
| chip->oledb.vreg.node = temp; |
| chip->oledb.swire_control = of_property_read_bool(temp, |
| "qcom,swire-control"); |
| chip->oledb.vout_override = of_property_read_bool(temp, |
| "qcom,default-vout-override"); |
| break; |
| case AB_PERIPH_TYPE: |
| chip->ab_base = base; |
| chip->ab.vreg.node = temp; |
| chip->ab.swire_control = of_property_read_bool(temp, |
| "qcom,swire-control"); |
| chip->ab.pd_control = of_property_read_bool(temp, |
| "qcom,aod-pd-control"); |
| break; |
| case IBB_PERIPH_TYPE: |
| chip->ibb_base = base; |
| chip->ibb.vreg.node = temp; |
| chip->ibb.swire_control = of_property_read_bool(temp, |
| "qcom,swire-control"); |
| chip->ibb.pd_control = of_property_read_bool(temp, |
| "qcom,aod-pd-control"); |
| break; |
| default: |
| pr_err("Unknown peripheral type 0x%x\n", val); |
| return -EINVAL; |
| } |
| |
| } |
| |
| return 0; |
| } |
| |
| static int qpnp_amoled_regulator_probe(struct platform_device *pdev) |
| { |
| int rc; |
| struct device_node *node; |
| struct qpnp_amoled *chip; |
| |
| node = pdev->dev.of_node; |
| if (!node) { |
| pr_err("No nodes defined\n"); |
| return -ENODEV; |
| } |
| |
| chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); |
| if (!chip) |
| return -ENOMEM; |
| |
| /* |
| * We need this workqueue to order the mode transitions that require |
| * timing considerations. This way, we can ensure whenever the mode |
| * transition is requested, it can be queued with high priority. |
| */ |
| chip->wq = alloc_ordered_workqueue("qpnp_amoled_wq", WQ_HIGHPRI); |
| if (!chip->wq) { |
| dev_err(chip->dev, "Unable to alloc workqueue\n"); |
| return -ENOMEM; |
| } |
| |
| INIT_DELAYED_WORK(&chip->vout_work, qpnp_amoled_vout_override_work); |
| chip->dev = &pdev->dev; |
| |
| chip->regmap = dev_get_regmap(pdev->dev.parent, NULL); |
| if (!chip->regmap) { |
| dev_err(&pdev->dev, "Failed to get the regmap handle\n"); |
| rc = -EINVAL; |
| goto error; |
| } |
| |
| dev_set_drvdata(&pdev->dev, chip); |
| |
| rc = qpnp_amoled_parse_dt(chip); |
| if (rc < 0) { |
| dev_err(chip->dev, "Failed to parse DT params rc=%d\n", rc); |
| goto error; |
| } |
| |
| rc = qpnp_amoled_hw_init(chip); |
| if (rc < 0) { |
| dev_err(chip->dev, "Failed to initialize HW rc=%d\n", rc); |
| goto error; |
| } |
| |
| return 0; |
| error: |
| destroy_workqueue(chip->wq); |
| return rc; |
| } |
| |
| static int qpnp_amoled_regulator_remove(struct platform_device *pdev) |
| { |
| struct qpnp_amoled *chip = dev_get_drvdata(&pdev->dev); |
| |
| destroy_workqueue(chip->wq); |
| return 0; |
| } |
| |
| static const struct of_device_id amoled_match_table[] = { |
| { .compatible = QPNP_AMOLED_REGULATOR_DRIVER_NAME, }, |
| { }, |
| }; |
| |
| static struct platform_driver qpnp_amoled_regulator_driver = { |
| .driver = { |
| .name = QPNP_AMOLED_REGULATOR_DRIVER_NAME, |
| .of_match_table = amoled_match_table, |
| .probe_type = PROBE_FORCE_SYNCHRONOUS, |
| }, |
| .probe = qpnp_amoled_regulator_probe, |
| .remove = qpnp_amoled_regulator_remove, |
| }; |
| |
| static int __init qpnp_amoled_regulator_init(void) |
| { |
| return platform_driver_register(&qpnp_amoled_regulator_driver); |
| } |
| |
| static void __exit qpnp_amoled_regulator_exit(void) |
| { |
| platform_driver_unregister(&qpnp_amoled_regulator_driver); |
| } |
| |
| MODULE_DESCRIPTION("QPNP AMOLED regulator driver"); |
| MODULE_LICENSE("GPL v2"); |
| |
| arch_initcall(qpnp_amoled_regulator_init); |
| module_exit(qpnp_amoled_regulator_exit); |