drivers/mfd/sprd-sc27xx-spi.c

   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>");