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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2017 Spreadtrum Communications Inc.4 */5 6#include <linux/interrupt.h>7#include <linux/kernel.h>8#include <linux/module.h>9#include <linux/mfd/core.h>10#include <linux/mfd/sc27xx-pmic.h>11#include <linux/of.h>12#include <linux/of_platform.h>13#include <linux/regmap.h>14#include <linux/spi/spi.h>15#include <uapi/linux/usb/charger.h>16 17#define SPRD_PMIC_INT_MASK_STATUS 0x018#define SPRD_PMIC_INT_RAW_STATUS 0x419#define SPRD_PMIC_INT_EN 0x820 21#define SPRD_SC2730_IRQ_BASE 0x8022#define SPRD_SC2730_IRQ_NUMS 1023#define SPRD_SC2730_CHG_DET 0x1b9c24#define SPRD_SC2731_IRQ_BASE 0x14025#define SPRD_SC2731_IRQ_NUMS 1626#define SPRD_SC2731_CHG_DET 0xedc27 28/* PMIC charger detection definition */29#define SPRD_PMIC_CHG_DET_DELAY_US 20000030#define SPRD_PMIC_CHG_DET_TIMEOUT 200000031#define SPRD_PMIC_CHG_DET_DONE BIT(11)32#define SPRD_PMIC_SDP_TYPE BIT(7)33#define SPRD_PMIC_DCP_TYPE BIT(6)34#define SPRD_PMIC_CDP_TYPE BIT(5)35#define SPRD_PMIC_CHG_TYPE_MASK GENMASK(7, 5)36 37struct sprd_pmic {38 struct regmap *regmap;39 struct device *dev;40 struct regmap_irq *irqs;41 struct regmap_irq_chip irq_chip;42 struct regmap_irq_chip_data *irq_data;43 const struct sprd_pmic_data *pdata;44 int irq;45};46 47struct sprd_pmic_data {48 u32 irq_base;49 u32 num_irqs;50 u32 charger_det;51};52 53/*54 * Since different PMICs of SC27xx series can have different interrupt55 * base address and irq number, we should save irq number and irq base56 * in the device data structure.57 */58static const struct sprd_pmic_data sc2730_data = {59 .irq_base = SPRD_SC2730_IRQ_BASE,60 .num_irqs = SPRD_SC2730_IRQ_NUMS,61 .charger_det = SPRD_SC2730_CHG_DET,62};63 64static const struct sprd_pmic_data sc2731_data = {65 .irq_base = SPRD_SC2731_IRQ_BASE,66 .num_irqs = SPRD_SC2731_IRQ_NUMS,67 .charger_det = SPRD_SC2731_CHG_DET,68};69 70enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)71{72 struct spi_device *spi = to_spi_device(dev);73 struct sprd_pmic *ddata = spi_get_drvdata(spi);74 const struct sprd_pmic_data *pdata = ddata->pdata;75 enum usb_charger_type type;76 u32 val;77 int ret;78 79 ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,80 (val & SPRD_PMIC_CHG_DET_DONE),81 SPRD_PMIC_CHG_DET_DELAY_US,82 SPRD_PMIC_CHG_DET_TIMEOUT);83 if (ret) {84 dev_err(&spi->dev, "failed to detect charger type\n");85 return UNKNOWN_TYPE;86 }87 88 switch (val & SPRD_PMIC_CHG_TYPE_MASK) {89 case SPRD_PMIC_CDP_TYPE:90 type = CDP_TYPE;91 break;92 case SPRD_PMIC_DCP_TYPE:93 type = DCP_TYPE;94 break;95 case SPRD_PMIC_SDP_TYPE:96 type = SDP_TYPE;97 break;98 default:99 type = UNKNOWN_TYPE;100 break;101 }102 103 return type;104}105EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);106 107static int sprd_pmic_spi_write(void *context, const void *data, size_t count)108{109 struct device *dev = context;110 struct spi_device *spi = to_spi_device(dev);111 112 return spi_write(spi, data, count);113}114 115static int sprd_pmic_spi_read(void *context,116 const void *reg, size_t reg_size,117 void *val, size_t val_size)118{119 struct device *dev = context;120 struct spi_device *spi = to_spi_device(dev);121 u32 rx_buf[2] = { 0 };122 int ret;123 124 /* Now we only support one PMIC register to read every time. */125 if (reg_size != sizeof(u32) || val_size != sizeof(u32))126 return -EINVAL;127 128 /* Copy address to read from into first element of SPI buffer. */129 memcpy(rx_buf, reg, sizeof(u32));130 ret = spi_read(spi, rx_buf, 1);131 if (ret < 0)132 return ret;133 134 memcpy(val, rx_buf, val_size);135 return 0;136}137 138static const struct regmap_bus sprd_pmic_regmap = {139 .write = sprd_pmic_spi_write,140 .read = sprd_pmic_spi_read,141 .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,142 .val_format_endian_default = REGMAP_ENDIAN_NATIVE,143};144 145static const struct regmap_config sprd_pmic_config = {146 .reg_bits = 32,147 .val_bits = 32,148 .reg_stride = 4,149 .max_register = 0xffff,150};151 152static int sprd_pmic_probe(struct spi_device *spi)153{154 struct sprd_pmic *ddata;155 const struct sprd_pmic_data *pdata;156 int ret, i;157 158 pdata = of_device_get_match_data(&spi->dev);159 if (!pdata) {160 dev_err(&spi->dev, "No matching driver data found\n");161 return -EINVAL;162 }163 164 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);165 if (!ddata)166 return -ENOMEM;167 168 ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,169 &spi->dev, &sprd_pmic_config);170 if (IS_ERR(ddata->regmap)) {171 ret = PTR_ERR(ddata->regmap);172 dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);173 return ret;174 }175 176 spi_set_drvdata(spi, ddata);177 ddata->dev = &spi->dev;178 ddata->irq = spi->irq;179 ddata->pdata = pdata;180 181 ddata->irq_chip.name = dev_name(&spi->dev);182 ddata->irq_chip.status_base =183 pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;184 ddata->irq_chip.unmask_base = pdata->irq_base + SPRD_PMIC_INT_EN;185 ddata->irq_chip.ack_base = 0;186 ddata->irq_chip.num_regs = 1;187 ddata->irq_chip.num_irqs = pdata->num_irqs;188 189 ddata->irqs = devm_kcalloc(&spi->dev,190 pdata->num_irqs, sizeof(struct regmap_irq),191 GFP_KERNEL);192 if (!ddata->irqs)193 return -ENOMEM;194 195 ddata->irq_chip.irqs = ddata->irqs;196 for (i = 0; i < pdata->num_irqs; i++)197 ddata->irqs[i].mask = BIT(i);198 199 ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,200 IRQF_ONESHOT, 0,201 &ddata->irq_chip, &ddata->irq_data);202 if (ret) {203 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);204 return ret;205 }206 207 ret = devm_of_platform_populate(&spi->dev);208 if (ret) {209 dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret);210 return ret;211 }212 213 device_init_wakeup(&spi->dev, true);214 return 0;215}216 217static int sprd_pmic_suspend(struct device *dev)218{219 struct sprd_pmic *ddata = dev_get_drvdata(dev);220 221 if (device_may_wakeup(dev))222 enable_irq_wake(ddata->irq);223 224 return 0;225}226 227static int sprd_pmic_resume(struct device *dev)228{229 struct sprd_pmic *ddata = dev_get_drvdata(dev);230 231 if (device_may_wakeup(dev))232 disable_irq_wake(ddata->irq);233 234 return 0;235}236 237static DEFINE_SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops,238 sprd_pmic_suspend, sprd_pmic_resume);239 240static const struct of_device_id sprd_pmic_match[] = {241 { .compatible = "sprd,sc2730", .data = &sc2730_data },242 { .compatible = "sprd,sc2731", .data = &sc2731_data },243 {},244};245MODULE_DEVICE_TABLE(of, sprd_pmic_match);246 247static const struct spi_device_id sprd_pmic_spi_ids[] = {248 { .name = "sc2730", .driver_data = (unsigned long)&sc2730_data },249 { .name = "sc2731", .driver_data = (unsigned long)&sc2731_data },250 {},251};252MODULE_DEVICE_TABLE(spi, sprd_pmic_spi_ids);253 254static struct spi_driver sprd_pmic_driver = {255 .driver = {256 .name = "sc27xx-pmic",257 .of_match_table = sprd_pmic_match,258 .pm = pm_sleep_ptr(&sprd_pmic_pm_ops),259 },260 .probe = sprd_pmic_probe,261 .id_table = sprd_pmic_spi_ids,262};263 264static int __init sprd_pmic_init(void)265{266 return spi_register_driver(&sprd_pmic_driver);267}268subsys_initcall(sprd_pmic_init);269 270static void __exit sprd_pmic_exit(void)271{272 spi_unregister_driver(&sprd_pmic_driver);273}274module_exit(sprd_pmic_exit);275 276MODULE_LICENSE("GPL v2");277MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");278MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");279