1 /* 2 * Copyright (C) 2017 Spreadtrum Communications Inc. 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/interrupt.h> 15 #include <linux/kernel.h> 16 #include <linux/module.h> 17 #include <linux/mfd/core.h> 18 #include <linux/of_device.h> 19 #include <linux/regmap.h> 20 #include <linux/spi/spi.h> 21 22 #define SPRD_PMIC_INT_MASK_STATUS 0x0 23 #define SPRD_PMIC_INT_RAW_STATUS 0x4 24 #define SPRD_PMIC_INT_EN 0x8 25 26 #define SPRD_SC2731_IRQ_BASE 0x140 27 #define SPRD_SC2731_IRQ_NUMS 16 28 29 struct sprd_pmic { 30 struct regmap *regmap; 31 struct device *dev; 32 struct regmap_irq *irqs; 33 struct regmap_irq_chip irq_chip; 34 struct regmap_irq_chip_data *irq_data; 35 int irq; 36 }; 37 38 struct sprd_pmic_data { 39 u32 irq_base; 40 u32 num_irqs; 41 }; 42 43 /* 44 * Since different PMICs of SC27xx series can have different interrupt 45 * base address and irq number, we should save irq number and irq base 46 * in the device data structure. 47 */ 48 static const struct sprd_pmic_data sc2731_data = { 49 .irq_base = SPRD_SC2731_IRQ_BASE, 50 .num_irqs = SPRD_SC2731_IRQ_NUMS, 51 }; 52 53 static const struct mfd_cell sprd_pmic_devs[] = { 54 { 55 .name = "sc27xx-wdt", 56 .of_compatible = "sprd,sc27xx-wdt", 57 }, { 58 .name = "sc27xx-rtc", 59 .of_compatible = "sprd,sc27xx-rtc", 60 }, { 61 .name = "sc27xx-charger", 62 .of_compatible = "sprd,sc27xx-charger", 63 }, { 64 .name = "sc27xx-chg-timer", 65 .of_compatible = "sprd,sc27xx-chg-timer", 66 }, { 67 .name = "sc27xx-fast-chg", 68 .of_compatible = "sprd,sc27xx-fast-chg", 69 }, { 70 .name = "sc27xx-chg-wdt", 71 .of_compatible = "sprd,sc27xx-chg-wdt", 72 }, { 73 .name = "sc27xx-typec", 74 .of_compatible = "sprd,sc27xx-typec", 75 }, { 76 .name = "sc27xx-flash", 77 .of_compatible = "sprd,sc27xx-flash", 78 }, { 79 .name = "sc27xx-eic", 80 .of_compatible = "sprd,sc27xx-eic", 81 }, { 82 .name = "sc27xx-efuse", 83 .of_compatible = "sprd,sc27xx-efuse", 84 }, { 85 .name = "sc27xx-thermal", 86 .of_compatible = "sprd,sc27xx-thermal", 87 }, { 88 .name = "sc27xx-adc", 89 .of_compatible = "sprd,sc27xx-adc", 90 }, { 91 .name = "sc27xx-audio-codec", 92 .of_compatible = "sprd,sc27xx-audio-codec", 93 }, { 94 .name = "sc27xx-regulator", 95 .of_compatible = "sprd,sc27xx-regulator", 96 }, { 97 .name = "sc27xx-vibrator", 98 .of_compatible = "sprd,sc27xx-vibrator", 99 }, { 100 .name = "sc27xx-keypad-led", 101 .of_compatible = "sprd,sc27xx-keypad-led", 102 }, { 103 .name = "sc27xx-bltc", 104 .of_compatible = "sprd,sc27xx-bltc", 105 }, { 106 .name = "sc27xx-fgu", 107 .of_compatible = "sprd,sc27xx-fgu", 108 }, { 109 .name = "sc27xx-7sreset", 110 .of_compatible = "sprd,sc27xx-7sreset", 111 }, { 112 .name = "sc27xx-poweroff", 113 .of_compatible = "sprd,sc27xx-poweroff", 114 }, { 115 .name = "sc27xx-syscon", 116 .of_compatible = "sprd,sc27xx-syscon", 117 }, 118 }; 119 120 static int sprd_pmic_spi_write(void *context, const void *data, size_t count) 121 { 122 struct device *dev = context; 123 struct spi_device *spi = to_spi_device(dev); 124 125 return spi_write(spi, data, count); 126 } 127 128 static int sprd_pmic_spi_read(void *context, 129 const void *reg, size_t reg_size, 130 void *val, size_t val_size) 131 { 132 struct device *dev = context; 133 struct spi_device *spi = to_spi_device(dev); 134 u32 rx_buf[2] = { 0 }; 135 int ret; 136 137 /* Now we only support one PMIC register to read every time. */ 138 if (reg_size != sizeof(u32) || val_size != sizeof(u32)) 139 return -EINVAL; 140 141 /* Copy address to read from into first element of SPI buffer. */ 142 memcpy(rx_buf, reg, sizeof(u32)); 143 ret = spi_read(spi, rx_buf, 1); 144 if (ret < 0) 145 return ret; 146 147 memcpy(val, rx_buf, val_size); 148 return 0; 149 } 150 151 static struct regmap_bus sprd_pmic_regmap = { 152 .write = sprd_pmic_spi_write, 153 .read = sprd_pmic_spi_read, 154 .reg_format_endian_default = REGMAP_ENDIAN_NATIVE, 155 .val_format_endian_default = REGMAP_ENDIAN_NATIVE, 156 }; 157 158 static const struct regmap_config sprd_pmic_config = { 159 .reg_bits = 32, 160 .val_bits = 32, 161 .reg_stride = 4, 162 .max_register = 0xffff, 163 }; 164 165 static int sprd_pmic_probe(struct spi_device *spi) 166 { 167 struct sprd_pmic *ddata; 168 const struct sprd_pmic_data *pdata; 169 int ret, i; 170 171 pdata = of_device_get_match_data(&spi->dev); 172 if (!pdata) { 173 dev_err(&spi->dev, "No matching driver data found\n"); 174 return -EINVAL; 175 } 176 177 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL); 178 if (!ddata) 179 return -ENOMEM; 180 181 ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap, 182 &spi->dev, &sprd_pmic_config); 183 if (IS_ERR(ddata->regmap)) { 184 ret = PTR_ERR(ddata->regmap); 185 dev_err(&spi->dev, "Failed to allocate register map %d\n", ret); 186 return ret; 187 } 188 189 spi_set_drvdata(spi, ddata); 190 ddata->dev = &spi->dev; 191 ddata->irq = spi->irq; 192 193 ddata->irq_chip.name = dev_name(&spi->dev); 194 ddata->irq_chip.status_base = 195 pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS; 196 ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN; 197 ddata->irq_chip.ack_base = 0; 198 ddata->irq_chip.num_regs = 1; 199 ddata->irq_chip.num_irqs = pdata->num_irqs; 200 ddata->irq_chip.mask_invert = true; 201 202 ddata->irqs = devm_kcalloc(&spi->dev, 203 pdata->num_irqs, sizeof(struct regmap_irq), 204 GFP_KERNEL); 205 if (!ddata->irqs) 206 return -ENOMEM; 207 208 ddata->irq_chip.irqs = ddata->irqs; 209 for (i = 0; i < pdata->num_irqs; i++) { 210 ddata->irqs[i].reg_offset = i / pdata->num_irqs; 211 ddata->irqs[i].mask = BIT(i % pdata->num_irqs); 212 } 213 214 ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq, 215 IRQF_ONESHOT | IRQF_NO_SUSPEND, 0, 216 &ddata->irq_chip, &ddata->irq_data); 217 if (ret) { 218 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret); 219 return ret; 220 } 221 222 ret = devm_mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO, 223 sprd_pmic_devs, ARRAY_SIZE(sprd_pmic_devs), 224 NULL, 0, 225 regmap_irq_get_domain(ddata->irq_data)); 226 if (ret) { 227 dev_err(&spi->dev, "Failed to register device %d\n", ret); 228 return ret; 229 } 230 231 return 0; 232 } 233 234 static const struct of_device_id sprd_pmic_match[] = { 235 { .compatible = "sprd,sc2731", .data = &sc2731_data }, 236 {}, 237 }; 238 MODULE_DEVICE_TABLE(of, sprd_pmic_match); 239 240 static struct spi_driver sprd_pmic_driver = { 241 .driver = { 242 .name = "sc27xx-pmic", 243 .bus = &spi_bus_type, 244 .of_match_table = sprd_pmic_match, 245 }, 246 .probe = sprd_pmic_probe, 247 }; 248 249 static int __init sprd_pmic_init(void) 250 { 251 return spi_register_driver(&sprd_pmic_driver); 252 } 253 subsys_initcall(sprd_pmic_init); 254 255 static void __exit sprd_pmic_exit(void) 256 { 257 spi_unregister_driver(&sprd_pmic_driver); 258 } 259 module_exit(sprd_pmic_exit); 260 261 MODULE_LICENSE("GPL v2"); 262 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver"); 263 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>"); 264