diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/mfd/sprd-sc27xx-spi.c | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/drivers/mfd/sprd-sc27xx-spi.c b/drivers/mfd/sprd-sc27xx-spi.c new file mode 100644 index 000000000..6b7956604 --- /dev/null +++ b/drivers/mfd/sprd-sc27xx-spi.c @@ -0,0 +1,262 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2017 Spreadtrum Communications Inc. + */ + +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/mfd/core.h> +#include <linux/mfd/sc27xx-pmic.h> +#include <linux/of_device.h> +#include <linux/of_platform.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> +#include <uapi/linux/usb/charger.h> + +#define SPRD_PMIC_INT_MASK_STATUS 0x0 +#define SPRD_PMIC_INT_RAW_STATUS 0x4 +#define SPRD_PMIC_INT_EN 0x8 + +#define SPRD_SC2731_IRQ_BASE 0x140 +#define SPRD_SC2731_IRQ_NUMS 16 +#define SPRD_SC2731_CHG_DET 0xedc + +/* PMIC charger detection definition */ +#define SPRD_PMIC_CHG_DET_DELAY_US 200000 +#define SPRD_PMIC_CHG_DET_TIMEOUT 2000000 +#define SPRD_PMIC_CHG_DET_DONE BIT(11) +#define SPRD_PMIC_SDP_TYPE BIT(7) +#define SPRD_PMIC_DCP_TYPE BIT(6) +#define SPRD_PMIC_CDP_TYPE BIT(5) +#define SPRD_PMIC_CHG_TYPE_MASK GENMASK(7, 5) + +struct sprd_pmic { + struct regmap *regmap; + struct device *dev; + struct regmap_irq *irqs; + struct regmap_irq_chip irq_chip; + struct regmap_irq_chip_data *irq_data; + const struct sprd_pmic_data *pdata; + int irq; +}; + +struct sprd_pmic_data { + u32 irq_base; + u32 num_irqs; + u32 charger_det; +}; + +/* + * Since different PMICs of SC27xx series can have different interrupt + * base address and irq number, we should save irq number and irq base + * in the device data structure. + */ +static const struct sprd_pmic_data sc2731_data = { + .irq_base = SPRD_SC2731_IRQ_BASE, + .num_irqs = SPRD_SC2731_IRQ_NUMS, + .charger_det = SPRD_SC2731_CHG_DET, +}; + +enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev) +{ + struct spi_device *spi = to_spi_device(dev); + struct sprd_pmic *ddata = spi_get_drvdata(spi); + const struct sprd_pmic_data *pdata = ddata->pdata; + enum usb_charger_type type; + u32 val; + int ret; + + ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val, + (val & SPRD_PMIC_CHG_DET_DONE), + SPRD_PMIC_CHG_DET_DELAY_US, + SPRD_PMIC_CHG_DET_TIMEOUT); + if (ret) { + dev_err(&spi->dev, "failed to detect charger type\n"); + return UNKNOWN_TYPE; + } + + switch (val & SPRD_PMIC_CHG_TYPE_MASK) { + case SPRD_PMIC_CDP_TYPE: + type = CDP_TYPE; + break; + case SPRD_PMIC_DCP_TYPE: + type = DCP_TYPE; + break; + case SPRD_PMIC_SDP_TYPE: + type = SDP_TYPE; + break; + default: + type = UNKNOWN_TYPE; + break; + } + + return type; +} +EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type); + +static int sprd_pmic_spi_write(void *context, const void *data, size_t count) +{ + struct device *dev = context; + struct spi_device *spi = to_spi_device(dev); + + return spi_write(spi, data, count); +} + +static int sprd_pmic_spi_read(void *context, + const void *reg, size_t reg_size, + void *val, size_t val_size) +{ + struct device *dev = context; + struct spi_device *spi = to_spi_device(dev); + u32 rx_buf[2] = { 0 }; + int ret; + + /* Now we only support one PMIC register to read every time. */ + if (reg_size != sizeof(u32) || val_size != sizeof(u32)) + return -EINVAL; + + /* Copy address to read from into first element of SPI buffer. */ + memcpy(rx_buf, reg, sizeof(u32)); + ret = spi_read(spi, rx_buf, 1); + if (ret < 0) + return ret; + + memcpy(val, rx_buf, val_size); + return 0; +} + +static struct regmap_bus sprd_pmic_regmap = { + .write = sprd_pmic_spi_write, + .read = sprd_pmic_spi_read, + .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, + .val_format_endian_default = REGMAP_ENDIAN_NATIVE, +}; + +static const struct regmap_config sprd_pmic_config = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = 0xffff, +}; + +static int sprd_pmic_probe(struct spi_device *spi) +{ + struct sprd_pmic *ddata; + const struct sprd_pmic_data *pdata; + int ret, i; + + pdata = of_device_get_match_data(&spi->dev); + if (!pdata) { + dev_err(&spi->dev, "No matching driver data found\n"); + return -EINVAL; + } + + ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL); + if (!ddata) + return -ENOMEM; + + ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap, + &spi->dev, &sprd_pmic_config); + if (IS_ERR(ddata->regmap)) { + ret = PTR_ERR(ddata->regmap); + dev_err(&spi->dev, "Failed to allocate register map %d\n", ret); + return ret; + } + + spi_set_drvdata(spi, ddata); + ddata->dev = &spi->dev; + ddata->irq = spi->irq; + ddata->pdata = pdata; + + ddata->irq_chip.name = dev_name(&spi->dev); + ddata->irq_chip.status_base = + pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS; + ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN; + ddata->irq_chip.ack_base = 0; + ddata->irq_chip.num_regs = 1; + ddata->irq_chip.num_irqs = pdata->num_irqs; + ddata->irq_chip.mask_invert = true; + + ddata->irqs = devm_kcalloc(&spi->dev, + pdata->num_irqs, sizeof(struct regmap_irq), + GFP_KERNEL); + if (!ddata->irqs) + return -ENOMEM; + + ddata->irq_chip.irqs = ddata->irqs; + for (i = 0; i < pdata->num_irqs; i++) + ddata->irqs[i].mask = BIT(i); + + ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq, + IRQF_ONESHOT, 0, + &ddata->irq_chip, &ddata->irq_data); + if (ret) { + dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret); + return ret; + } + + ret = devm_of_platform_populate(&spi->dev); + if (ret) { + dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret); + return ret; + } + + device_init_wakeup(&spi->dev, true); + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int sprd_pmic_suspend(struct device *dev) +{ + struct sprd_pmic *ddata = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + enable_irq_wake(ddata->irq); + + return 0; +} + +static int sprd_pmic_resume(struct device *dev) +{ + struct sprd_pmic *ddata = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + disable_irq_wake(ddata->irq); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, sprd_pmic_suspend, sprd_pmic_resume); + +static const struct of_device_id sprd_pmic_match[] = { + { .compatible = "sprd,sc2731", .data = &sc2731_data }, + {}, +}; +MODULE_DEVICE_TABLE(of, sprd_pmic_match); + +static struct spi_driver sprd_pmic_driver = { + .driver = { + .name = "sc27xx-pmic", + .of_match_table = sprd_pmic_match, + .pm = &sprd_pmic_pm_ops, + }, + .probe = sprd_pmic_probe, +}; + +static int __init sprd_pmic_init(void) +{ + return spi_register_driver(&sprd_pmic_driver); +} +subsys_initcall(sprd_pmic_init); + +static void __exit sprd_pmic_exit(void) +{ + spi_unregister_driver(&sprd_pmic_driver); +} +module_exit(sprd_pmic_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver"); +MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>"); |