// 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.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_SC2730_IRQ_BASE 0x80
#define SPRD_SC2730_IRQ_NUMS 10
#define SPRD_SC2730_CHG_DET 0x1b9c
#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 sc2730_data = {
.irq_base = SPRD_SC2730_IRQ_BASE,
.num_irqs = SPRD_SC2730_IRQ_NUMS,
.charger_det = SPRD_SC2730_CHG_DET,
};
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 const 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.unmask_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->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;
}
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;
}
static DEFINE_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,sc2730", .data = &sc2730_data },
{ .compatible = "sprd,sc2731", .data = &sc2731_data },
{},
};
MODULE_DEVICE_TABLE(of, sprd_pmic_match);
static const struct spi_device_id sprd_pmic_spi_ids[] = {
{ .name = "sc2730", .driver_data = (unsigned long)&sc2730_data },
{ .name = "sc2731", .driver_data = (unsigned long)&sc2731_data },
{},
};
MODULE_DEVICE_TABLE(spi, sprd_pmic_spi_ids);
static struct spi_driver sprd_pmic_driver = {
.driver = {
.name = "sc27xx-pmic",
.of_match_table = sprd_pmic_match,
.pm = pm_sleep_ptr(&sprd_pmic_pm_ops),
},
.probe = sprd_pmic_probe,
.id_table = sprd_pmic_spi_ids,
};
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 <[email protected]>");
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