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/mfd/sc27xx-pmic.h>
  11 #include <linux/of.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 const 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>");