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/of_device.h> 11 #include <linux/regmap.h> 12 #include <linux/spi/spi.h> 13 14 #define SPRD_PMIC_INT_MASK_STATUS 0x0 15 #define SPRD_PMIC_INT_RAW_STATUS 0x4 16 #define SPRD_PMIC_INT_EN 0x8 17 18 #define SPRD_SC2731_IRQ_BASE 0x140 19 #define SPRD_SC2731_IRQ_NUMS 16 20 21 struct sprd_pmic { 22 struct regmap *regmap; 23 struct device *dev; 24 struct regmap_irq *irqs; 25 struct regmap_irq_chip irq_chip; 26 struct regmap_irq_chip_data *irq_data; 27 int irq; 28 }; 29 30 struct sprd_pmic_data { 31 u32 irq_base; 32 u32 num_irqs; 33 }; 34 35 /* 36 * Since different PMICs of SC27xx series can have different interrupt 37 * base address and irq number, we should save irq number and irq base 38 * in the device data structure. 39 */ 40 static const struct sprd_pmic_data sc2731_data = { 41 .irq_base = SPRD_SC2731_IRQ_BASE, 42 .num_irqs = SPRD_SC2731_IRQ_NUMS, 43 }; 44 45 static const struct mfd_cell sprd_pmic_devs[] = { 46 { 47 .name = "sc27xx-wdt", 48 .of_compatible = "sprd,sc2731-wdt", 49 }, { 50 .name = "sc27xx-rtc", 51 .of_compatible = "sprd,sc2731-rtc", 52 }, { 53 .name = "sc27xx-charger", 54 .of_compatible = "sprd,sc2731-charger", 55 }, { 56 .name = "sc27xx-chg-timer", 57 .of_compatible = "sprd,sc2731-chg-timer", 58 }, { 59 .name = "sc27xx-fast-chg", 60 .of_compatible = "sprd,sc2731-fast-chg", 61 }, { 62 .name = "sc27xx-chg-wdt", 63 .of_compatible = "sprd,sc2731-chg-wdt", 64 }, { 65 .name = "sc27xx-typec", 66 .of_compatible = "sprd,sc2731-typec", 67 }, { 68 .name = "sc27xx-flash", 69 .of_compatible = "sprd,sc2731-flash", 70 }, { 71 .name = "sc27xx-eic", 72 .of_compatible = "sprd,sc2731-eic", 73 }, { 74 .name = "sc27xx-efuse", 75 .of_compatible = "sprd,sc2731-efuse", 76 }, { 77 .name = "sc27xx-thermal", 78 .of_compatible = "sprd,sc2731-thermal", 79 }, { 80 .name = "sc27xx-adc", 81 .of_compatible = "sprd,sc2731-adc", 82 }, { 83 .name = "sc27xx-audio-codec", 84 .of_compatible = "sprd,sc2731-audio-codec", 85 }, { 86 .name = "sc27xx-regulator", 87 .of_compatible = "sprd,sc2731-regulator", 88 }, { 89 .name = "sc27xx-vibrator", 90 .of_compatible = "sprd,sc2731-vibrator", 91 }, { 92 .name = "sc27xx-keypad-led", 93 .of_compatible = "sprd,sc2731-keypad-led", 94 }, { 95 .name = "sc27xx-bltc", 96 .of_compatible = "sprd,sc2731-bltc", 97 }, { 98 .name = "sc27xx-fgu", 99 .of_compatible = "sprd,sc2731-fgu", 100 }, { 101 .name = "sc27xx-7sreset", 102 .of_compatible = "sprd,sc2731-7sreset", 103 }, { 104 .name = "sc27xx-poweroff", 105 .of_compatible = "sprd,sc2731-poweroff", 106 }, { 107 .name = "sc27xx-syscon", 108 .of_compatible = "sprd,sc2731-syscon", 109 }, 110 }; 111 112 static int sprd_pmic_spi_write(void *context, const void *data, size_t count) 113 { 114 struct device *dev = context; 115 struct spi_device *spi = to_spi_device(dev); 116 117 return spi_write(spi, data, count); 118 } 119 120 static int sprd_pmic_spi_read(void *context, 121 const void *reg, size_t reg_size, 122 void *val, size_t val_size) 123 { 124 struct device *dev = context; 125 struct spi_device *spi = to_spi_device(dev); 126 u32 rx_buf[2] = { 0 }; 127 int ret; 128 129 /* Now we only support one PMIC register to read every time. */ 130 if (reg_size != sizeof(u32) || val_size != sizeof(u32)) 131 return -EINVAL; 132 133 /* Copy address to read from into first element of SPI buffer. */ 134 memcpy(rx_buf, reg, sizeof(u32)); 135 ret = spi_read(spi, rx_buf, 1); 136 if (ret < 0) 137 return ret; 138 139 memcpy(val, rx_buf, val_size); 140 return 0; 141 } 142 143 static struct regmap_bus sprd_pmic_regmap = { 144 .write = sprd_pmic_spi_write, 145 .read = sprd_pmic_spi_read, 146 .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, 147 .val_format_endian_default = REGMAP_ENDIAN_NATIVE, 148 }; 149 150 static const struct regmap_config sprd_pmic_config = { 151 .reg_bits = 32, 152 .val_bits = 32, 153 .reg_stride = 4, 154 .max_register = 0xffff, 155 }; 156 157 static int sprd_pmic_probe(struct spi_device *spi) 158 { 159 struct sprd_pmic *ddata; 160 const struct sprd_pmic_data *pdata; 161 int ret, i; 162 163 pdata = of_device_get_match_data(&spi->dev); 164 if (!pdata) { 165 dev_err(&spi->dev, "No matching driver data found\n"); 166 return -EINVAL; 167 } 168 169 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL); 170 if (!ddata) 171 return -ENOMEM; 172 173 ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap, 174 &spi->dev, &sprd_pmic_config); 175 if (IS_ERR(ddata->regmap)) { 176 ret = PTR_ERR(ddata->regmap); 177 dev_err(&spi->dev, "Failed to allocate register map %d\n", ret); 178 return ret; 179 } 180 181 spi_set_drvdata(spi, ddata); 182 ddata->dev = &spi->dev; 183 ddata->irq = spi->irq; 184 185 ddata->irq_chip.name = dev_name(&spi->dev); 186 ddata->irq_chip.status_base = 187 pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS; 188 ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN; 189 ddata->irq_chip.ack_base = 0; 190 ddata->irq_chip.num_regs = 1; 191 ddata->irq_chip.num_irqs = pdata->num_irqs; 192 ddata->irq_chip.mask_invert = true; 193 194 ddata->irqs = devm_kcalloc(&spi->dev, 195 pdata->num_irqs, sizeof(struct regmap_irq), 196 GFP_KERNEL); 197 if (!ddata->irqs) 198 return -ENOMEM; 199 200 ddata->irq_chip.irqs = ddata->irqs; 201 for (i = 0; i < pdata->num_irqs; i++) { 202 ddata->irqs[i].reg_offset = i / pdata->num_irqs; 203 ddata->irqs[i].mask = BIT(i % pdata->num_irqs); 204 } 205 206 ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq, 207 IRQF_ONESHOT | IRQF_NO_SUSPEND, 0, 208 &ddata->irq_chip, &ddata->irq_data); 209 if (ret) { 210 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret); 211 return ret; 212 } 213 214 ret = devm_mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO, 215 sprd_pmic_devs, ARRAY_SIZE(sprd_pmic_devs), 216 NULL, 0, 217 regmap_irq_get_domain(ddata->irq_data)); 218 if (ret) { 219 dev_err(&spi->dev, "Failed to register device %d\n", ret); 220 return ret; 221 } 222 223 return 0; 224 } 225 226 static const struct of_device_id sprd_pmic_match[] = { 227 { .compatible = "sprd,sc2731", .data = &sc2731_data }, 228 {}, 229 }; 230 MODULE_DEVICE_TABLE(of, sprd_pmic_match); 231 232 static struct spi_driver sprd_pmic_driver = { 233 .driver = { 234 .name = "sc27xx-pmic", 235 .bus = &spi_bus_type, 236 .of_match_table = sprd_pmic_match, 237 }, 238 .probe = sprd_pmic_probe, 239 }; 240 241 static int __init sprd_pmic_init(void) 242 { 243 return spi_register_driver(&sprd_pmic_driver); 244 } 245 subsys_initcall(sprd_pmic_init); 246 247 static void __exit sprd_pmic_exit(void) 248 { 249 spi_unregister_driver(&sprd_pmic_driver); 250 } 251 module_exit(sprd_pmic_exit); 252 253 MODULE_LICENSE("GPL v2"); 254 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver"); 255 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>"); 256