diff options
Diffstat (limited to 'drivers/regulator/qcom-labibb-regulator.c')
| -rw-r--r-- | drivers/regulator/qcom-labibb-regulator.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/regulator/qcom-labibb-regulator.c b/drivers/regulator/qcom-labibb-regulator.c new file mode 100644 index 000000000000..8c7dd1928380 --- /dev/null +++ b/drivers/regulator/qcom-labibb-regulator.c @@ -0,0 +1,175 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright (c) 2020, The Linux Foundation. All rights reserved. + +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> +#include <linux/regulator/driver.h> +#include <linux/regulator/of_regulator.h> + +#define REG_PERPH_TYPE 0x04 + +#define QCOM_LAB_TYPE 0x24 +#define QCOM_IBB_TYPE 0x20 + +#define PMI8998_LAB_REG_BASE 0xde00 +#define PMI8998_IBB_REG_BASE 0xdc00 + +#define REG_LABIBB_STATUS1 0x08 +#define REG_LABIBB_ENABLE_CTL 0x46 +#define LABIBB_STATUS1_VREG_OK_BIT BIT(7) +#define LABIBB_CONTROL_ENABLE BIT(7) + +#define LAB_ENABLE_CTL_MASK BIT(7) +#define IBB_ENABLE_CTL_MASK (BIT(7) | BIT(6)) + +#define LABIBB_OFF_ON_DELAY 1000 +#define LAB_ENABLE_TIME (LABIBB_OFF_ON_DELAY * 2) +#define IBB_ENABLE_TIME (LABIBB_OFF_ON_DELAY * 10) +#define LABIBB_POLL_ENABLED_TIME 1000 + +struct labibb_regulator { + struct regulator_desc desc; + struct device *dev; + struct regmap *regmap; + struct regulator_dev *rdev; + u16 base; + u8 type; +}; + +struct labibb_regulator_data { + const char *name; + u8 type; + u16 base; + struct regulator_desc *desc; +}; + +static struct regulator_ops qcom_labibb_ops = { + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, +}; + +static struct regulator_desc pmi8998_lab_desc = { + .enable_mask = LAB_ENABLE_CTL_MASK, + .enable_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_ENABLE_CTL), + .enable_val = LABIBB_CONTROL_ENABLE, + .enable_time = LAB_ENABLE_TIME, + .poll_enabled_time = LABIBB_POLL_ENABLED_TIME, + .off_on_delay = LABIBB_OFF_ON_DELAY, + .owner = THIS_MODULE, + .type = REGULATOR_VOLTAGE, + .ops = &qcom_labibb_ops, +}; + +static struct regulator_desc pmi8998_ibb_desc = { + .enable_mask = IBB_ENABLE_CTL_MASK, + .enable_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_ENABLE_CTL), + .enable_val = LABIBB_CONTROL_ENABLE, + .enable_time = IBB_ENABLE_TIME, + .poll_enabled_time = LABIBB_POLL_ENABLED_TIME, + .off_on_delay = LABIBB_OFF_ON_DELAY, + .owner = THIS_MODULE, + .type = REGULATOR_VOLTAGE, + .ops = &qcom_labibb_ops, +}; + +static const struct labibb_regulator_data pmi8998_labibb_data[] = { + {"lab", QCOM_LAB_TYPE, PMI8998_LAB_REG_BASE, &pmi8998_lab_desc}, + {"ibb", QCOM_IBB_TYPE, PMI8998_IBB_REG_BASE, &pmi8998_ibb_desc}, + { }, +}; + +static const struct of_device_id qcom_labibb_match[] = { + { .compatible = "qcom,pmi8998-lab-ibb", .data = &pmi8998_labibb_data}, + { }, +}; +MODULE_DEVICE_TABLE(of, qcom_labibb_match); + +static int qcom_labibb_regulator_probe(struct platform_device *pdev) +{ + struct labibb_regulator *vreg; + struct device *dev = &pdev->dev; + struct regulator_config cfg = {}; + + const struct of_device_id *match; + const struct labibb_regulator_data *reg_data; + struct regmap *reg_regmap; + unsigned int type; + int ret; + + reg_regmap = dev_get_regmap(pdev->dev.parent, NULL); + if (!reg_regmap) { + dev_err(&pdev->dev, "Couldn't get parent's regmap\n"); + return -ENODEV; + } + + match = of_match_device(qcom_labibb_match, &pdev->dev); + if (!match) + return -ENODEV; + + for (reg_data = match->data; reg_data->name; reg_data++) { + + /* Validate if the type of regulator is indeed + * what's mentioned in DT. + */ + ret = regmap_read(reg_regmap, reg_data->base + REG_PERPH_TYPE, + &type); + if (ret < 0) { + dev_err(dev, + "Peripheral type read failed ret=%d\n", + ret); + return -EINVAL; + } + + if (WARN_ON((type != QCOM_LAB_TYPE) && (type != QCOM_IBB_TYPE)) || + WARN_ON(type != reg_data->type)) + return -EINVAL; + + vreg = devm_kzalloc(&pdev->dev, sizeof(*vreg), + GFP_KERNEL); + if (!vreg) + return -ENOMEM; + + vreg->regmap = reg_regmap; + vreg->dev = dev; + vreg->base = reg_data->base; + vreg->type = reg_data->type; + + memcpy(&vreg->desc, reg_data->desc, sizeof(vreg->desc)); + vreg->desc.of_match = reg_data->name; + vreg->desc.name = reg_data->name; + + cfg.dev = vreg->dev; + cfg.driver_data = vreg; + cfg.regmap = vreg->regmap; + + vreg->rdev = devm_regulator_register(vreg->dev, &vreg->desc, + &cfg); + + if (IS_ERR(vreg->rdev)) { + dev_err(dev, "qcom_labibb: error registering %s : %d\n", + reg_data->name, ret); + return PTR_ERR(vreg->rdev); + } + } + + return 0; +} + +static struct platform_driver qcom_labibb_regulator_driver = { + .driver = { + .name = "qcom-lab-ibb-regulator", + .of_match_table = qcom_labibb_match, + }, + .probe = qcom_labibb_regulator_probe, +}; +module_platform_driver(qcom_labibb_regulator_driver); + +MODULE_DESCRIPTION("Qualcomm labibb driver"); +MODULE_AUTHOR("Nisha Kumari <nishakumari@codeaurora.org>"); +MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>"); +MODULE_LICENSE("GPL v2"); |