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_SC2730_IRQ_BASE 0x80 22 #define SPRD_SC2730_IRQ_NUMS 10 23 #define SPRD_SC2730_CHG_DET 0x1b9c 24 #define SPRD_SC2731_IRQ_BASE 0x140 25 #define SPRD_SC2731_IRQ_NUMS 16 26 #define SPRD_SC2731_CHG_DET 0xedc 27 28 /* PMIC charger detection definition */ 29 #define SPRD_PMIC_CHG_DET_DELAY_US 200000 30 #define SPRD_PMIC_CHG_DET_TIMEOUT 2000000 31 #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 37 struct 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 47 struct 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 interrupt 55 * base address and irq number, we should save irq number and irq base 56 * in the device data structure. 57 */ 58 static 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 64 static 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 70 enum 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 } 105 EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type); 106 107 static 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 } 114 115 static 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 } 137 138 static 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 }; 144 145 static const struct regmap_config sprd_pmic_config = { 146 .reg_bits = 32, 147 .val_bits = 32, 148 .reg_stride = 4, 149 .max_register = 0xffff, 150 }; 151 152 static 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 } 216 217 static 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 } 226 227 static 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 } 236 237 static DEFINE_SIMPLE_DEV_PM_OPS(sprd_pmic_pm_ops, 238 sprd_pmic_suspend, sprd_pmic_resume); 239 240 static const struct of_device_id sprd_pmic_match[] = { 241 { .compatible = "sprd,sc2730", .data = &sc2730_data }, 242 { .compatible = "sprd,sc2731", .data = &sc2731_data }, 243 {}, 244 }; 245 MODULE_DEVICE_TABLE(of, sprd_pmic_match); 246 247 static 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 }; 252 MODULE_DEVICE_TABLE(spi, sprd_pmic_spi_ids); 253 254 static 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 }; 263 264 static int __init sprd_pmic_init(void) 265 { 266 return spi_register_driver(&sprd_pmic_driver); 267 } 268 subsys_initcall(sprd_pmic_init); 269 270 static void __exit sprd_pmic_exit(void) 271 { 272 spi_unregister_driver(&sprd_pmic_driver); 273 } 274 module_exit(sprd_pmic_exit); 275 276 MODULE_LICENSE("GPL v2"); 277 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver"); 278 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>"); 279