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
  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 <[email protected]>");