1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 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_device.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 0x0 18 #define SPRD_PMIC_INT_RAW_STATUS 0x4 19 #define SPRD_PMIC_INT_EN 0x8 20 21 #define SPRD_SC2731_IRQ_BASE 0x140 22 #define SPRD_SC2731_IRQ_NUMS 16 23 #define SPRD_SC2731_CHG_DET 0xedc 24 25 /* PMIC charger detection definition */ 26 #define SPRD_PMIC_CHG_DET_DELAY_US 200000 27 #define SPRD_PMIC_CHG_DET_TIMEOUT 2000000 28 #define SPRD_PMIC_CHG_DET_DONE BIT(11) 29 #define SPRD_PMIC_SDP_TYPE BIT(7) 30 #define SPRD_PMIC_DCP_TYPE BIT(6) 31 #define SPRD_PMIC_CDP_TYPE BIT(5) 32 #define SPRD_PMIC_CHG_TYPE_MASK GENMASK(7, 5) 33 34 struct sprd_pmic { 35 struct regmap *regmap; 36 struct device *dev; 37 struct regmap_irq *irqs; 38 struct regmap_irq_chip irq_chip; 39 struct regmap_irq_chip_data *irq_data; 40 const struct sprd_pmic_data *pdata; 41 int irq; 42 }; 43 44 struct sprd_pmic_data { 45 u32 irq_base; 46 u32 num_irqs; 47 u32 charger_det; 48 }; 49 50 /* 51 * Since different PMICs of SC27xx series can have different interrupt 52 * base address and irq number, we should save irq number and irq base 53 * in the device data structure. 54 */ 55 static const struct sprd_pmic_data sc2731_data = { 56 .irq_base = SPRD_SC2731_IRQ_BASE, 57 .num_irqs = SPRD_SC2731_IRQ_NUMS, 58 .charger_det = SPRD_SC2731_CHG_DET, 59 }; 60 61 enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev) 62 { 63 struct spi_device *spi = to_spi_device(dev); 64 struct sprd_pmic *ddata = spi_get_drvdata(spi); 65 const struct sprd_pmic_data *pdata = ddata->pdata; 66 enum usb_charger_type type; 67 u32 val; 68 int ret; 69 70 ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val, 71 (val & SPRD_PMIC_CHG_DET_DONE), 72 SPRD_PMIC_CHG_DET_DELAY_US, 73 SPRD_PMIC_CHG_DET_TIMEOUT); 74 if (ret) { 75 dev_err(&spi->dev, "failed to detect charger type\n"); 76 return UNKNOWN_TYPE; 77 } 78 79 switch (val & SPRD_PMIC_CHG_TYPE_MASK) { 80 case SPRD_PMIC_CDP_TYPE: 81 type = CDP_TYPE; 82 break; 83 case SPRD_PMIC_DCP_TYPE: 84 type = DCP_TYPE; 85 break; 86 case SPRD_PMIC_SDP_TYPE: 87 type = SDP_TYPE; 88 break; 89 default: 90 type = UNKNOWN_TYPE; 91 break; 92 } 93 94 return type; 95 } 96 EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type); 97 98 static int sprd_pmic_spi_write(void *context, const void *data, size_t count) 99 { 100 struct device *dev = context; 101 struct spi_device *spi = to_spi_device(dev); 102 103 return spi_write(spi, data, count); 104 } 105 106 static int sprd_pmic_spi_read(void *context, 107 const void *reg, size_t reg_size, 108 void *val, size_t val_size) 109 { 110 struct device *dev = context; 111 struct spi_device *spi = to_spi_device(dev); 112 u32 rx_buf[2] = { 0 }; 113 int ret; 114 115 /* Now we only support one PMIC register to read every time. */ 116 if (reg_size != sizeof(u32) || val_size != sizeof(u32)) 117 return -EINVAL; 118 119 /* Copy address to read from into first element of SPI buffer. */ 120 memcpy(rx_buf, reg, sizeof(u32)); 121 ret = spi_read(spi, rx_buf, 1); 122 if (ret < 0) 123 return ret; 124 125 memcpy(val, rx_buf, val_size); 126 return 0; 127 } 128 129 static struct regmap_bus sprd_pmic_regmap = { 130 .write = sprd_pmic_spi_write, 131 .read = sprd_pmic_spi_read, 132 .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, 133 .val_format_endian_default = REGMAP_ENDIAN_NATIVE, 134 }; 135 136 static const struct regmap_config sprd_pmic_config = { 137 .reg_bits = 32, 138 .val_bits = 32, 139 .reg_stride = 4, 140 .max_register = 0xffff, 141 }; 142 143 static int sprd_pmic_probe(struct spi_device *spi) 144 { 145 struct sprd_pmic *ddata; 146 const struct sprd_pmic_data *pdata; 147 int ret, i; 148 149 pdata = of_device_get_match_data(&spi->dev); 150 if (!pdata) { 151 dev_err(&spi->dev, "No matching driver data found\n"); 152 return -EINVAL; 153 } 154 155 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL); 156 if (!ddata) 157 return -ENOMEM; 158 159 ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap, 160 &spi->dev, &sprd_pmic_config); 161 if (IS_ERR(ddata->regmap)) { 162 ret = PTR_ERR(ddata->regmap); 163 dev_err(&spi->dev, "Failed to allocate register map %d\n", ret); 164 return ret; 165 } 166 167 spi_set_drvdata(spi, ddata); 168 ddata->dev = &spi->dev; 169 ddata->irq = spi->irq; 170 ddata->pdata = pdata; 171 172 ddata->irq_chip.name = dev_name(&spi->dev); 173 ddata->irq_chip.status_base = 174 pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS; 175 ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN; 176 ddata->irq_chip.ack_base = 0; 177 ddata->irq_chip.num_regs = 1; 178 ddata->irq_chip.num_irqs = pdata->num_irqs; 179 ddata->irq_chip.mask_invert = true; 180 181 ddata->irqs = devm_kcalloc(&spi->dev, 182 pdata->num_irqs, sizeof(struct regmap_irq), 183 GFP_KERNEL); 184 if (!ddata->irqs) 185 return -ENOMEM; 186 187 ddata->irq_chip.irqs = ddata->irqs; 188 for (i = 0; i < pdata->num_irqs; i++) 189 ddata->irqs[i].mask = BIT(i); 190 191 ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq, 192 IRQF_ONESHOT | IRQF_NO_SUSPEND, 0, 193 &ddata->irq_chip, &ddata->irq_data); 194 if (ret) { 195 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret); 196 return ret; 197 } 198 199 ret = devm_of_platform_populate(&spi->dev); 200 if (ret) { 201 dev_err(&spi->dev, "Failed to populate sub-devices %d\n", ret); 202 return ret; 203 } 204 205 return 0; 206 } 207 208 static const struct of_device_id sprd_pmic_match[] = { 209 { .compatible = "sprd,sc2731", .data = &sc2731_data }, 210 {}, 211 }; 212 MODULE_DEVICE_TABLE(of, sprd_pmic_match); 213 214 static struct spi_driver sprd_pmic_driver = { 215 .driver = { 216 .name = "sc27xx-pmic", 217 .of_match_table = sprd_pmic_match, 218 }, 219 .probe = sprd_pmic_probe, 220 }; 221 222 static int __init sprd_pmic_init(void) 223 { 224 return spi_register_driver(&sprd_pmic_driver); 225 } 226 subsys_initcall(sprd_pmic_init); 227 228 static void __exit sprd_pmic_exit(void) 229 { 230 spi_unregister_driver(&sprd_pmic_driver); 231 } 232 module_exit(sprd_pmic_exit); 233 234 MODULE_LICENSE("GPL v2"); 235 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver"); 236 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>"); 237