linux/drivers/mfd/sprd-sc27xx-spi.c
Baolin Wang 2a7e7274f3 mfd: sc27xx: Add USB charger type detection support
The Spreadtrum SC27XX series PMICs supply the USB charger type detection
function, and related registers are located on the PMIC global registers
region, thus we implement and export this function in the MFD driver for
users to get the USB charger type.

Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2020-03-30 07:35:28 +01:00

308 lines
7.6 KiB
C

// 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/of_device.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 const struct mfd_cell sprd_pmic_devs[] = {
{
.name = "sc27xx-wdt",
.of_compatible = "sprd,sc2731-wdt",
}, {
.name = "sc27xx-rtc",
.of_compatible = "sprd,sc2731-rtc",
}, {
.name = "sc27xx-charger",
.of_compatible = "sprd,sc2731-charger",
}, {
.name = "sc27xx-chg-timer",
.of_compatible = "sprd,sc2731-chg-timer",
}, {
.name = "sc27xx-fast-chg",
.of_compatible = "sprd,sc2731-fast-chg",
}, {
.name = "sc27xx-chg-wdt",
.of_compatible = "sprd,sc2731-chg-wdt",
}, {
.name = "sc27xx-typec",
.of_compatible = "sprd,sc2731-typec",
}, {
.name = "sc27xx-flash",
.of_compatible = "sprd,sc2731-flash",
}, {
.name = "sc27xx-eic",
.of_compatible = "sprd,sc2731-eic",
}, {
.name = "sc27xx-efuse",
.of_compatible = "sprd,sc2731-efuse",
}, {
.name = "sc27xx-thermal",
.of_compatible = "sprd,sc2731-thermal",
}, {
.name = "sc27xx-adc",
.of_compatible = "sprd,sc2731-adc",
}, {
.name = "sc27xx-audio-codec",
.of_compatible = "sprd,sc2731-audio-codec",
}, {
.name = "sc27xx-regulator",
.of_compatible = "sprd,sc2731-regulator",
}, {
.name = "sc27xx-vibrator",
.of_compatible = "sprd,sc2731-vibrator",
}, {
.name = "sc27xx-keypad-led",
.of_compatible = "sprd,sc2731-keypad-led",
}, {
.name = "sc27xx-bltc",
.of_compatible = "sprd,sc2731-bltc",
}, {
.name = "sc27xx-fgu",
.of_compatible = "sprd,sc2731-fgu",
}, {
.name = "sc27xx-7sreset",
.of_compatible = "sprd,sc2731-7sreset",
}, {
.name = "sc27xx-poweroff",
.of_compatible = "sprd,sc2731-poweroff",
}, {
.name = "sc27xx-syscon",
.of_compatible = "sprd,sc2731-syscon",
},
};
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].reg_offset = i / pdata->num_irqs;
ddata->irqs[i].mask = BIT(i % pdata->num_irqs);
}
ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
IRQF_ONESHOT | IRQF_NO_SUSPEND, 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_mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO,
sprd_pmic_devs, ARRAY_SIZE(sprd_pmic_devs),
NULL, 0,
regmap_irq_get_domain(ddata->irq_data));
if (ret) {
dev_err(&spi->dev, "Failed to register device %d\n", ret);
return ret;
}
return 0;
}
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",
.bus = &spi_bus_type,
.of_match_table = sprd_pmic_match,
},
.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>");