drivers/mfd/sprd-sc27xx-spi.c

   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 #include <uapi/linux/usb/charger.h>
  14
  15 #define SPRD_PMIC_INT_MASK_STATUS       0x0
  16 #define SPRD_PMIC_INT_RAW_STATUS        0x4
  17 #define SPRD_PMIC_INT_EN                0x8
  18
  19 #define SPRD_SC2731_IRQ_BASE            0x140
  20 #define SPRD_SC2731_IRQ_NUMS            16
  21 #define SPRD_SC2731_CHG_DET             0xedc
  22
  23 /* PMIC charger detection definition */
  24 #define SPRD_PMIC_CHG_DET_DELAY_US      200000
  25 #define SPRD_PMIC_CHG_DET_TIMEOUT       2000000
  26 #define SPRD_PMIC_CHG_DET_DONE          BIT(11)
  27 #define SPRD_PMIC_SDP_TYPE              BIT(7)
  28 #define SPRD_PMIC_DCP_TYPE              BIT(6)
  29 #define SPRD_PMIC_CDP_TYPE              BIT(5)
  30 #define SPRD_PMIC_CHG_TYPE_MASK         GENMASK(7, 5)
  31
  32 struct sprd_pmic {
  33         struct regmap *regmap;
  34         struct device *dev;
  35         struct regmap_irq *irqs;
  36         struct regmap_irq_chip irq_chip;
  37         struct regmap_irq_chip_data *irq_data;
  38         const struct sprd_pmic_data *pdata;
  39         int irq;
  40 };
  41
  42 struct sprd_pmic_data {
  43         u32 irq_base;
  44         u32 num_irqs;
  45         u32 charger_det;
  46 };
  47
  48 /*
  49  * Since different PMICs of SC27xx series can have different interrupt
  50  * base address and irq number, we should save irq number and irq base
  51  * in the device data structure.
  52  */
  53 static const struct sprd_pmic_data sc2731_data = {
  54         .irq_base = SPRD_SC2731_IRQ_BASE,
  55         .num_irqs = SPRD_SC2731_IRQ_NUMS,
  56         .charger_det = SPRD_SC2731_CHG_DET,
  57 };
  58
  59 enum usb_charger_type sprd_pmic_detect_charger_type(struct device *dev)
  60 {
  61         struct spi_device *spi = to_spi_device(dev);
  62         struct sprd_pmic *ddata = spi_get_drvdata(spi);
  63         const struct sprd_pmic_data *pdata = ddata->pdata;
  64         enum usb_charger_type type;
  65         u32 val;
  66         int ret;
  67
  68         ret = regmap_read_poll_timeout(ddata->regmap, pdata->charger_det, val,
  69                                        (val & SPRD_PMIC_CHG_DET_DONE),
  70                                        SPRD_PMIC_CHG_DET_DELAY_US,
  71                                        SPRD_PMIC_CHG_DET_TIMEOUT);
  72         if (ret) {
  73                 dev_err(&spi->dev, "failed to detect charger type\n");
  74                 return UNKNOWN_TYPE;
  75         }
  76
  77         switch (val & SPRD_PMIC_CHG_TYPE_MASK) {
  78         case SPRD_PMIC_CDP_TYPE:
  79                 type = CDP_TYPE;
  80                 break;
  81         case SPRD_PMIC_DCP_TYPE:
  82                 type = DCP_TYPE;
  83                 break;
  84         case SPRD_PMIC_SDP_TYPE:
  85                 type = SDP_TYPE;
  86                 break;
  87         default:
  88                 type = UNKNOWN_TYPE;
  89                 break;
  90         }
  91
  92         return type;
  93 }
  94 EXPORT_SYMBOL_GPL(sprd_pmic_detect_charger_type);
  95
  96 static const struct mfd_cell sprd_pmic_devs[] = {
  97         {
  98                 .name = "sc27xx-wdt",
  99                 .of_compatible = "sprd,sc2731-wdt",
 100         }, {
 101                 .name = "sc27xx-rtc",
 102                 .of_compatible = "sprd,sc2731-rtc",
 103         }, {
 104                 .name = "sc27xx-charger",
 105                 .of_compatible = "sprd,sc2731-charger",
 106         }, {
 107                 .name = "sc27xx-chg-timer",
 108                 .of_compatible = "sprd,sc2731-chg-timer",
 109         }, {
 110                 .name = "sc27xx-fast-chg",
 111                 .of_compatible = "sprd,sc2731-fast-chg",
 112         }, {
 113                 .name = "sc27xx-chg-wdt",
 114                 .of_compatible = "sprd,sc2731-chg-wdt",
 115         }, {
 116                 .name = "sc27xx-typec",
 117                 .of_compatible = "sprd,sc2731-typec",
 118         }, {
 119                 .name = "sc27xx-flash",
 120                 .of_compatible = "sprd,sc2731-flash",
 121         }, {
 122                 .name = "sc27xx-eic",
 123                 .of_compatible = "sprd,sc2731-eic",
 124         }, {
 125                 .name = "sc27xx-efuse",
 126                 .of_compatible = "sprd,sc2731-efuse",
 127         }, {
 128                 .name = "sc27xx-thermal",
 129                 .of_compatible = "sprd,sc2731-thermal",
 130         }, {
 131                 .name = "sc27xx-adc",
 132                 .of_compatible = "sprd,sc2731-adc",
 133         }, {
 134                 .name = "sc27xx-audio-codec",
 135                 .of_compatible = "sprd,sc2731-audio-codec",
 136         }, {
 137                 .name = "sc27xx-regulator",
 138                 .of_compatible = "sprd,sc2731-regulator",
 139         }, {
 140                 .name = "sc27xx-vibrator",
 141                 .of_compatible = "sprd,sc2731-vibrator",
 142         }, {
 143                 .name = "sc27xx-keypad-led",
 144                 .of_compatible = "sprd,sc2731-keypad-led",
 145         }, {
 146                 .name = "sc27xx-bltc",
 147                 .of_compatible = "sprd,sc2731-bltc",
 148         }, {
 149                 .name = "sc27xx-fgu",
 150                 .of_compatible = "sprd,sc2731-fgu",
 151         }, {
 152                 .name = "sc27xx-7sreset",
 153                 .of_compatible = "sprd,sc2731-7sreset",
 154         }, {
 155                 .name = "sc27xx-poweroff",
 156                 .of_compatible = "sprd,sc2731-poweroff",
 157         }, {
 158                 .name = "sc27xx-syscon",
 159                 .of_compatible = "sprd,sc2731-syscon",
 160         },
 161 };
 162
 163 static int sprd_pmic_spi_write(void *context, const void *data, size_t count)
 164 {
 165         struct device *dev = context;
 166         struct spi_device *spi = to_spi_device(dev);
 167
 168         return spi_write(spi, data, count);
 169 }
 170
 171 static int sprd_pmic_spi_read(void *context,
 172                               const void *reg, size_t reg_size,
 173                               void *val, size_t val_size)
 174 {
 175         struct device *dev = context;
 176         struct spi_device *spi = to_spi_device(dev);
 177         u32 rx_buf[2] = { 0 };
 178         int ret;
 179
 180         /* Now we only support one PMIC register to read every time. */
 181         if (reg_size != sizeof(u32) || val_size != sizeof(u32))
 182                 return -EINVAL;
 183
 184         /* Copy address to read from into first element of SPI buffer. */
 185         memcpy(rx_buf, reg, sizeof(u32));
 186         ret = spi_read(spi, rx_buf, 1);
 187         if (ret < 0)
 188                 return ret;
 189
 190         memcpy(val, rx_buf, val_size);
 191         return 0;
 192 }
 193
 194 static struct regmap_bus sprd_pmic_regmap = {
 195         .write = sprd_pmic_spi_write,
 196         .read = sprd_pmic_spi_read,
 197         .reg_format_endian_default = REGMAP_ENDIAN_NATIVE,
 198         .val_format_endian_default = REGMAP_ENDIAN_NATIVE,
 199 };
 200
 201 static const struct regmap_config sprd_pmic_config = {
 202         .reg_bits = 32,
 203         .val_bits = 32,
 204         .reg_stride = 4,
 205         .max_register = 0xffff,
 206 };
 207
 208 static int sprd_pmic_probe(struct spi_device *spi)
 209 {
 210         struct sprd_pmic *ddata;
 211         const struct sprd_pmic_data *pdata;
 212         int ret, i;
 213
 214         pdata = of_device_get_match_data(&spi->dev);
 215         if (!pdata) {
 216                 dev_err(&spi->dev, "No matching driver data found\n");
 217                 return -EINVAL;
 218         }
 219
 220         ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
 221         if (!ddata)
 222                 return -ENOMEM;
 223
 224         ddata->regmap = devm_regmap_init(&spi->dev, &sprd_pmic_regmap,
 225                                          &spi->dev, &sprd_pmic_config);
 226         if (IS_ERR(ddata->regmap)) {
 227                 ret = PTR_ERR(ddata->regmap);
 228                 dev_err(&spi->dev, "Failed to allocate register map %d\n", ret);
 229                 return ret;
 230         }
 231
 232         spi_set_drvdata(spi, ddata);
 233         ddata->dev = &spi->dev;
 234         ddata->irq = spi->irq;
 235         ddata->pdata = pdata;
 236
 237         ddata->irq_chip.name = dev_name(&spi->dev);
 238         ddata->irq_chip.status_base =
 239                 pdata->irq_base + SPRD_PMIC_INT_MASK_STATUS;
 240         ddata->irq_chip.mask_base = pdata->irq_base + SPRD_PMIC_INT_EN;
 241         ddata->irq_chip.ack_base = 0;
 242         ddata->irq_chip.num_regs = 1;
 243         ddata->irq_chip.num_irqs = pdata->num_irqs;
 244         ddata->irq_chip.mask_invert = true;
 245
 246         ddata->irqs = devm_kcalloc(&spi->dev,
 247                                    pdata->num_irqs, sizeof(struct regmap_irq),
 248                                    GFP_KERNEL);
 249         if (!ddata->irqs)
 250                 return -ENOMEM;
 251
 252         ddata->irq_chip.irqs = ddata->irqs;
 253         for (i = 0; i < pdata->num_irqs; i++) {
 254                 ddata->irqs[i].reg_offset = i / pdata->num_irqs;
 255                 ddata->irqs[i].mask = BIT(i % pdata->num_irqs);
 256         }
 257
 258         ret = devm_regmap_add_irq_chip(&spi->dev, ddata->regmap, ddata->irq,
 259                                        IRQF_ONESHOT | IRQF_NO_SUSPEND, 0,
 260                                        &ddata->irq_chip, &ddata->irq_data);
 261         if (ret) {
 262                 dev_err(&spi->dev, "Failed to add PMIC irq chip %d\n", ret);
 263                 return ret;
 264         }
 265
 266         ret = devm_mfd_add_devices(&spi->dev, PLATFORM_DEVID_AUTO,
 267                                    sprd_pmic_devs, ARRAY_SIZE(sprd_pmic_devs),
 268                                    NULL, 0,
 269                                    regmap_irq_get_domain(ddata->irq_data));
 270         if (ret) {
 271                 dev_err(&spi->dev, "Failed to register device %d\n", ret);
 272                 return ret;
 273         }
 274
 275         return 0;
 276 }
 277
 278 static const struct of_device_id sprd_pmic_match[] = {
 279         { .compatible = "sprd,sc2731", .data = &sc2731_data },
 280         {},
 281 };
 282 MODULE_DEVICE_TABLE(of, sprd_pmic_match);
 283
 284 static struct spi_driver sprd_pmic_driver = {
 285         .driver = {
 286                 .name = "sc27xx-pmic",
 287                 .of_match_table = sprd_pmic_match,
 288         },
 289         .probe = sprd_pmic_probe,
 290 };
 291
 292 static int __init sprd_pmic_init(void)
 293 {
 294         return spi_register_driver(&sprd_pmic_driver);
 295 }
 296 subsys_initcall(sprd_pmic_init);
 297
 298 static void __exit sprd_pmic_exit(void)
 299 {
 300         spi_unregister_driver(&sprd_pmic_driver);
 301 }
 302 module_exit(sprd_pmic_exit);
 303
 304 MODULE_LICENSE("GPL v2");
 305 MODULE_DESCRIPTION("Spreadtrum SC27xx PMICs driver");
 306 MODULE_AUTHOR("Baolin Wang <baolin.wang@spreadtrum.com>");