drivers/mfd/motorola-cpcap.c

   1 /*
   2  * Motorola CPCAP PMIC core driver
   3  *
   4  * Copyright (C) 2016 Tony Lindgren <tony@atomide.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/device.h>
  12 #include <linux/err.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/irq.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/sysfs.h>
  20
  21 #include <linux/mfd/core.h>
  22 #include <linux/mfd/motorola-cpcap.h>
  23 #include <linux/spi/spi.h>
  24
  25 #define CPCAP_NR_IRQ_REG_BANKS  6
  26 #define CPCAP_NR_IRQ_CHIPS      3
  27 #define CPCAP_REGISTER_SIZE     4
  28 #define CPCAP_REGISTER_BITS     16
  29
  30 struct cpcap_ddata {
  31         struct spi_device *spi;
  32         struct regmap_irq *irqs;
  33         struct regmap_irq_chip_data *irqdata[CPCAP_NR_IRQ_CHIPS];
  34         const struct regmap_config *regmap_conf;
  35         struct regmap *regmap;
  36 };
  37
  38 static int cpcap_sense_irq(struct regmap *regmap, int irq)
  39 {
  40         int regnum = irq / CPCAP_REGISTER_BITS;
  41         int mask = BIT(irq % CPCAP_REGISTER_BITS);
  42         int reg = CPCAP_REG_INTS1 + (regnum * CPCAP_REGISTER_SIZE);
  43         int err, val;
  44
  45         if (reg < CPCAP_REG_INTS1 || reg > CPCAP_REG_INTS4)
  46                 return -EINVAL;
  47
  48         err = regmap_read(regmap, reg, &val);
  49         if (err)
  50                 return err;
  51
  52         return !!(val & mask);
  53 }
  54
  55 int cpcap_sense_virq(struct regmap *regmap, int virq)
  56 {
  57         struct regmap_irq_chip_data *d = irq_get_chip_data(virq);
  58         int irq_base = regmap_irq_chip_get_base(d);
  59
  60         return cpcap_sense_irq(regmap, virq - irq_base);
  61 }
  62 EXPORT_SYMBOL_GPL(cpcap_sense_virq);
  63
  64 static int cpcap_check_revision(struct cpcap_ddata *cpcap)
  65 {
  66         u16 vendor, rev;
  67         int ret;
  68
  69         ret = cpcap_get_vendor(&cpcap->spi->dev, cpcap->regmap, &vendor);
  70         if (ret)
  71                 return ret;
  72
  73         ret = cpcap_get_revision(&cpcap->spi->dev, cpcap->regmap, &rev);
  74         if (ret)
  75                 return ret;
  76
  77         dev_info(&cpcap->spi->dev, "CPCAP vendor: %s rev: %i.%i (%x)\n",
  78                  vendor == CPCAP_VENDOR_ST ? "ST" : "TI",
  79                  CPCAP_REVISION_MAJOR(rev), CPCAP_REVISION_MINOR(rev),
  80                  rev);
  81
  82         if (rev < CPCAP_REVISION_2_1) {
  83                 dev_info(&cpcap->spi->dev,
  84                          "Please add old CPCAP revision support as needed\n");
  85                 return -ENODEV;
  86         }
  87
  88         return 0;
  89 }
  90
  91 /*
  92  * First two irq chips are the two private macro interrupt chips, the third
  93  * irq chip is for register banks 1 - 4 and is available for drivers to use.
  94  */
  95 static struct regmap_irq_chip cpcap_irq_chip[CPCAP_NR_IRQ_CHIPS] = {
  96         {
  97                 .name = "cpcap-m2",
  98                 .num_regs = 1,
  99                 .status_base = CPCAP_REG_MI1,
 100                 .ack_base = CPCAP_REG_MI1,
 101                 .mask_base = CPCAP_REG_MIM1,
 102                 .use_ack = true,
 103                 .ack_invert = true,
 104         },
 105         {
 106                 .name = "cpcap-m2",
 107                 .num_regs = 1,
 108                 .status_base = CPCAP_REG_MI2,
 109                 .ack_base = CPCAP_REG_MI2,
 110                 .mask_base = CPCAP_REG_MIM2,
 111                 .use_ack = true,
 112                 .ack_invert = true,
 113         },
 114         {
 115                 .name = "cpcap1-4",
 116                 .num_regs = 4,
 117                 .status_base = CPCAP_REG_INT1,
 118                 .ack_base = CPCAP_REG_INT1,
 119                 .mask_base = CPCAP_REG_INTM1,
 120                 .use_ack = true,
 121                 .ack_invert = true,
 122         },
 123 };
 124
 125 static void cpcap_init_one_regmap_irq(struct cpcap_ddata *cpcap,
 126                                       struct regmap_irq *rirq,
 127                                       int irq_base, int irq)
 128 {
 129         unsigned int reg_offset;
 130         unsigned int bit, mask;
 131
 132         reg_offset = irq - irq_base;
 133         reg_offset /= cpcap->regmap_conf->val_bits;
 134         reg_offset *= cpcap->regmap_conf->reg_stride;
 135
 136         bit = irq % cpcap->regmap_conf->val_bits;
 137         mask = (1 << bit);
 138
 139         rirq->reg_offset = reg_offset;
 140         rirq->mask = mask;
 141 }
 142
 143 static int cpcap_init_irq_chip(struct cpcap_ddata *cpcap, int irq_chip,
 144                                int irq_start, int nr_irqs)
 145 {
 146         struct regmap_irq_chip *chip = &cpcap_irq_chip[irq_chip];
 147         int i, ret;
 148
 149         for (i = irq_start; i < irq_start + nr_irqs; i++) {
 150                 struct regmap_irq *rirq = &cpcap->irqs[i];
 151
 152                 cpcap_init_one_regmap_irq(cpcap, rirq, irq_start, i);
 153         }
 154         chip->irqs = &cpcap->irqs[irq_start];
 155         chip->num_irqs = nr_irqs;
 156         chip->irq_drv_data = cpcap;
 157
 158         ret = devm_regmap_add_irq_chip(&cpcap->spi->dev, cpcap->regmap,
 159                                        cpcap->spi->irq,
 160                                        irq_get_trigger_type(cpcap->spi->irq) |
 161                                        IRQF_SHARED, -1,
 162                                        chip, &cpcap->irqdata[irq_chip]);
 163         if (ret) {
 164                 dev_err(&cpcap->spi->dev, "could not add irq chip %i: %i\n",
 165                         irq_chip, ret);
 166                 return ret;
 167         }
 168
 169         return 0;
 170 }
 171
 172 static int cpcap_init_irq(struct cpcap_ddata *cpcap)
 173 {
 174         int ret;
 175
 176         cpcap->irqs = devm_kzalloc(&cpcap->spi->dev,
 177                                    array3_size(sizeof(*cpcap->irqs),
 178                                                CPCAP_NR_IRQ_REG_BANKS,
 179                                                cpcap->regmap_conf->val_bits),
 180                                    GFP_KERNEL);
 181         if (!cpcap->irqs)
 182                 return -ENOMEM;
 183
 184         ret = cpcap_init_irq_chip(cpcap, 0, 0, 16);
 185         if (ret)
 186                 return ret;
 187
 188         ret = cpcap_init_irq_chip(cpcap, 1, 16, 16);
 189         if (ret)
 190                 return ret;
 191
 192         ret = cpcap_init_irq_chip(cpcap, 2, 32, 64);
 193         if (ret)
 194                 return ret;
 195
 196         enable_irq_wake(cpcap->spi->irq);
 197
 198         return 0;
 199 }
 200
 201 static const struct of_device_id cpcap_of_match[] = {
 202         { .compatible = "motorola,cpcap", },
 203         { .compatible = "st,6556002", },
 204         {},
 205 };
 206 MODULE_DEVICE_TABLE(of, cpcap_of_match);
 207
 208 static const struct regmap_config cpcap_regmap_config = {
 209         .reg_bits = 16,
 210         .reg_stride = 4,
 211         .pad_bits = 0,
 212         .val_bits = 16,
 213         .write_flag_mask = 0x8000,
 214         .max_register = CPCAP_REG_ST_TEST2,
 215         .cache_type = REGCACHE_NONE,
 216         .reg_format_endian = REGMAP_ENDIAN_LITTLE,
 217         .val_format_endian = REGMAP_ENDIAN_LITTLE,
 218 };
 219
 220 static const struct mfd_cell cpcap_mfd_devices[] = {
 221         {
 222                 .name          = "cpcap_adc",
 223                 .of_compatible = "motorola,mapphone-cpcap-adc",
 224         }, {
 225                 .name          = "cpcap_battery",
 226                 .of_compatible = "motorola,cpcap-battery",
 227         }, {
 228                 .name          = "cpcap-charger",
 229                 .of_compatible = "motorola,mapphone-cpcap-charger",
 230         }, {
 231                 .name          = "cpcap-regulator",
 232                 .of_compatible = "motorola,mapphone-cpcap-regulator",
 233         }, {
 234                 .name          = "cpcap-rtc",
 235                 .of_compatible = "motorola,cpcap-rtc",
 236         }, {
 237                 .name          = "cpcap-pwrbutton",
 238                 .of_compatible = "motorola,cpcap-pwrbutton",
 239         }, {
 240                 .name          = "cpcap-usb-phy",
 241                 .of_compatible = "motorola,mapphone-cpcap-usb-phy",
 242         }, {
 243                 .name          = "cpcap-led",
 244                 .id            = 0,
 245                 .of_compatible = "motorola,cpcap-led-red",
 246         }, {
 247                 .name          = "cpcap-led",
 248                 .id            = 1,
 249                 .of_compatible = "motorola,cpcap-led-green",
 250         }, {
 251                 .name          = "cpcap-led",
 252                 .id            = 2,
 253                 .of_compatible = "motorola,cpcap-led-blue",
 254         }, {
 255                 .name          = "cpcap-led",
 256                 .id            = 3,
 257                 .of_compatible = "motorola,cpcap-led-adl",
 258         }, {
 259                 .name          = "cpcap-led",
 260                 .id            = 4,
 261                 .of_compatible = "motorola,cpcap-led-cp",
 262         }, {
 263                 .name          = "cpcap-codec",
 264         }
 265 };
 266
 267 static int cpcap_probe(struct spi_device *spi)
 268 {
 269         const struct of_device_id *match;
 270         struct cpcap_ddata *cpcap;
 271         int ret;
 272
 273         match = of_match_device(of_match_ptr(cpcap_of_match), &spi->dev);
 274         if (!match)
 275                 return -ENODEV;
 276
 277         cpcap = devm_kzalloc(&spi->dev, sizeof(*cpcap), GFP_KERNEL);
 278         if (!cpcap)
 279                 return -ENOMEM;
 280
 281         cpcap->spi = spi;
 282         spi_set_drvdata(spi, cpcap);
 283
 284         spi->bits_per_word = 16;
 285         spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
 286
 287         ret = spi_setup(spi);
 288         if (ret)
 289                 return ret;
 290
 291         cpcap->regmap_conf = &cpcap_regmap_config;
 292         cpcap->regmap = devm_regmap_init_spi(spi, &cpcap_regmap_config);
 293         if (IS_ERR(cpcap->regmap)) {
 294                 ret = PTR_ERR(cpcap->regmap);
 295                 dev_err(&cpcap->spi->dev, "Failed to initialize regmap: %d\n",
 296                         ret);
 297
 298                 return ret;
 299         }
 300
 301         ret = cpcap_check_revision(cpcap);
 302         if (ret) {
 303                 dev_err(&cpcap->spi->dev, "Failed to detect CPCAP: %i\n", ret);
 304                 return ret;
 305         }
 306
 307         ret = cpcap_init_irq(cpcap);
 308         if (ret)
 309                 return ret;
 310
 311         return devm_mfd_add_devices(&spi->dev, 0, cpcap_mfd_devices,
 312                                     ARRAY_SIZE(cpcap_mfd_devices), NULL, 0, NULL);
 313 }
 314
 315 static struct spi_driver cpcap_driver = {
 316         .driver = {
 317                 .name = "cpcap-core",
 318                 .of_match_table = cpcap_of_match,
 319         },
 320         .probe = cpcap_probe,
 321 };
 322 module_spi_driver(cpcap_driver);
 323
 324 MODULE_ALIAS("platform:cpcap");
 325 MODULE_DESCRIPTION("CPCAP driver");
 326 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 327 MODULE_LICENSE("GPL v2");