drivers/mfd/arizona-spi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arizona-spi.c  --  Arizona SPI bus interface
   4  *
   5  * Copyright 2012 Wolfson Microelectronics plc
   6  *
   7  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/err.h>
  12 #include <linux/gpio/consumer.h>
  13 #include <linux/gpio/machine.h>
  14 #include <linux/module.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/regmap.h>
  17 #include <linux/regulator/consumer.h>
  18 #include <linux/slab.h>
  19 #include <linux/spi/spi.h>
  20 #include <linux/of.h>
  21 #include <uapi/linux/input-event-codes.h>
  22
  23 #include <linux/mfd/arizona/core.h>
  24
  25 #include "arizona.h"
  26
  27 #ifdef CONFIG_ACPI
  28 static const struct acpi_gpio_params reset_gpios = { 1, 0, false };
  29 static const struct acpi_gpio_params ldoena_gpios = { 2, 0, false };
  30
  31 static const struct acpi_gpio_mapping arizona_acpi_gpios[] = {
  32         { "reset-gpios", &reset_gpios, 1, },
  33         { "wlf,ldoena-gpios", &ldoena_gpios, 1 },
  34         { }
  35 };
  36
  37 /*
  38  * The ACPI resources for the device only describe external GPIO-s. They do
  39  * not provide mappings for the GPIO-s coming from the Arizona codec itself.
  40  */
  41 static const struct gpiod_lookup arizona_soc_gpios[] = {
  42         { "arizona", 2, "wlf,spkvdd-ena", 0, GPIO_ACTIVE_HIGH },
  43         { "arizona", 4, "wlf,micd-pol", 0, GPIO_ACTIVE_LOW },
  44 };
  45
  46 static void arizona_spi_acpi_remove_lookup(void *lookup)
  47 {
  48         gpiod_remove_lookup_table(lookup);
  49 }
  50
  51 /* For ACPI tables from boards which ship with Windows as factory OS */
  52 static int arizona_spi_acpi_windows_probe(struct arizona *arizona)
  53 {
  54         struct gpiod_lookup_table *lookup;
  55         acpi_status status;
  56         int ret;
  57
  58         /* Add mappings for the 2 ACPI declared GPIOs used for reset and ldo-ena */
  59         devm_acpi_dev_add_driver_gpios(arizona->dev, arizona_acpi_gpios);
  60
  61         /* Add lookups for the SoCs own GPIOs used for micdet-polarity and spkVDD-enable */
  62         lookup = devm_kzalloc(arizona->dev,
  63                               struct_size(lookup, table, ARRAY_SIZE(arizona_soc_gpios) + 1),
  64                               GFP_KERNEL);
  65         if (!lookup)
  66                 return -ENOMEM;
  67
  68         lookup->dev_id = dev_name(arizona->dev);
  69         memcpy(lookup->table, arizona_soc_gpios, sizeof(arizona_soc_gpios));
  70
  71         gpiod_add_lookup_table(lookup);
  72         ret = devm_add_action_or_reset(arizona->dev, arizona_spi_acpi_remove_lookup, lookup);
  73         if (ret)
  74                 return ret;
  75
  76         /* Enable 32KHz clock from SoC to codec for jack-detect */
  77         status = acpi_evaluate_object(ACPI_HANDLE(arizona->dev), "CLKE", NULL, NULL);
  78         if (ACPI_FAILURE(status))
  79                 dev_warn(arizona->dev, "Failed to enable 32KHz clk ACPI error %d\n", status);
  80
  81         return 0;
  82 }
  83
  84 /* For ACPI tables from boards which ship with Android as factory OS */
  85 static int arizona_spi_acpi_android_probe(struct arizona *arizona)
  86 {
  87         int ret;
  88
  89         /*
  90          * Get the reset GPIO, treating -ENOENT as -EPROBE_DEFER to wait for
  91          * the x86-android-tablets module to register the board specific GPIO
  92          * lookup table.
  93          */
  94         arizona->pdata.reset = devm_gpiod_get(arizona->dev, "reset", GPIOD_OUT_LOW);
  95         if (IS_ERR(arizona->pdata.reset)) {
  96                 ret = PTR_ERR(arizona->pdata.reset);
  97                 if (ret == -ENOENT) {
  98                         dev_info_once(arizona->dev,
  99                                       "Deferring probe till GPIO lookup is registered\n");
 100                         ret = -EPROBE_DEFER;
 101                 }
 102                 return dev_err_probe(arizona->dev, ret, "getting reset GPIO\n");
 103         }
 104
 105         return 0;
 106 }
 107
 108 /*
 109  * The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
 110  * Function A Play/Pause:           0 ohm
 111  * Function D Voice assistant:    135 ohm
 112  * Function B Volume Up           240 ohm
 113  * Function C Volume Down         470 ohm
 114  * Minimum Mic DC resistance     1000 ohm
 115  * Minimum Ear speaker impedance   16 ohm
 116  * Note the first max value below must be less then the min. speaker impedance,
 117  * to allow CTIA/OMTP detection to work. The other max values are the closest
 118  * value from extcon-arizona.c:arizona_micd_levels halfway 2 button resistances.
 119  */
 120 static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {
 121         { .max =  11, .key = KEY_PLAYPAUSE },
 122         { .max = 186, .key = KEY_VOICECOMMAND },
 123         { .max = 348, .key = KEY_VOLUMEUP },
 124         { .max = 752, .key = KEY_VOLUMEDOWN },
 125 };
 126
 127 static int arizona_spi_acpi_probe(struct arizona *arizona)
 128 {
 129         struct acpi_device *adev = ACPI_COMPANION(arizona->dev);
 130         int ret;
 131
 132         if (acpi_dev_hid_uid_match(adev, "10WM5102", NULL))
 133                 ret = arizona_spi_acpi_android_probe(arizona);
 134         else
 135                 ret = arizona_spi_acpi_windows_probe(arizona);
 136
 137         if (ret)
 138                 return ret;
 139
 140         /*
 141          * Some DSDTs wrongly declare the IRQ trigger-type as IRQF_TRIGGER_FALLING
 142          * The IRQ line will stay low when a new IRQ event happens between reading
 143          * the IRQ status flags and acknowledging them. When the IRQ line stays
 144          * low like this the IRQ will never trigger again when its type is set
 145          * to IRQF_TRIGGER_FALLING. Correct the IRQ trigger-type to fix this.
 146          *
 147          * Note theoretically it is possible that some boards are not capable
 148          * of handling active low level interrupts. In that case setting the
 149          * flag to IRQF_TRIGGER_FALLING would not be a bug (and we would need
 150          * to work around this) but so far all known usages of IRQF_TRIGGER_FALLING
 151          * are a bug in the board's DSDT.
 152          */
 153         arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
 154
 155         /* Wait 200 ms after jack insertion */
 156         arizona->pdata.micd_detect_debounce = 200;
 157
 158         /* Use standard AOSP values for headset-button mappings */
 159         arizona->pdata.micd_ranges = arizona_micd_aosp_ranges;
 160         arizona->pdata.num_micd_ranges = ARRAY_SIZE(arizona_micd_aosp_ranges);
 161
 162         /* Use left headphone speaker for HP vs line-out detection */
 163         arizona->pdata.hpdet_channel = ARIZONA_ACCDET_MODE_HPL;
 164
 165         return 0;
 166 }
 167
 168 static const struct acpi_device_id arizona_acpi_match[] = {
 169         {
 170                 .id = "WM510204",
 171                 .driver_data = WM5102,
 172         },
 173         {
 174                 .id = "WM510205",
 175                 .driver_data = WM5102,
 176         },
 177         {
 178                 .id = "10WM5102",
 179                 .driver_data = WM5102,
 180         },
 181         { }
 182 };
 183 MODULE_DEVICE_TABLE(acpi, arizona_acpi_match);
 184 #else
 185 static int arizona_spi_acpi_probe(struct arizona *arizona)
 186 {
 187         return -ENODEV;
 188 }
 189 #endif
 190
 191 static int arizona_spi_probe(struct spi_device *spi)
 192 {
 193         struct arizona *arizona;
 194         const struct regmap_config *regmap_config = NULL;
 195         unsigned long type = 0;
 196         int ret;
 197
 198         type = (unsigned long)spi_get_device_match_data(spi);
 199         switch (type) {
 200         case WM5102:
 201                 if (IS_ENABLED(CONFIG_MFD_WM5102))
 202                         regmap_config = &wm5102_spi_regmap;
 203                 break;
 204         case WM5110:
 205         case WM8280:
 206                 if (IS_ENABLED(CONFIG_MFD_WM5110))
 207                         regmap_config = &wm5110_spi_regmap;
 208                 break;
 209         case WM1831:
 210         case CS47L24:
 211                 if (IS_ENABLED(CONFIG_MFD_CS47L24))
 212                         regmap_config = &cs47l24_spi_regmap;
 213                 break;
 214         default:
 215                 dev_err(&spi->dev, "Unknown device type %ld\n", type);
 216                 return -EINVAL;
 217         }
 218
 219         if (!regmap_config) {
 220                 dev_err(&spi->dev,
 221                         "No kernel support for device type %ld\n", type);
 222                 return -EINVAL;
 223         }
 224
 225         arizona = devm_kzalloc(&spi->dev, sizeof(*arizona), GFP_KERNEL);
 226         if (arizona == NULL)
 227                 return -ENOMEM;
 228
 229         arizona->regmap = devm_regmap_init_spi(spi, regmap_config);
 230         if (IS_ERR(arizona->regmap)) {
 231                 ret = PTR_ERR(arizona->regmap);
 232                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
 233                         ret);
 234                 return ret;
 235         }
 236
 237         arizona->type = type;
 238         arizona->dev = &spi->dev;
 239         arizona->irq = spi->irq;
 240
 241         if (has_acpi_companion(&spi->dev)) {
 242                 ret = arizona_spi_acpi_probe(arizona);
 243                 if (ret)
 244                         return ret;
 245         }
 246
 247         return arizona_dev_init(arizona);
 248 }
 249
 250 static void arizona_spi_remove(struct spi_device *spi)
 251 {
 252         struct arizona *arizona = spi_get_drvdata(spi);
 253
 254         arizona_dev_exit(arizona);
 255 }
 256
 257 static const struct spi_device_id arizona_spi_ids[] = {
 258         { "wm5102", WM5102 },
 259         { "wm5110", WM5110 },
 260         { "wm8280", WM8280 },
 261         { "wm1831", WM1831 },
 262         { "cs47l24", CS47L24 },
 263         { },
 264 };
 265 MODULE_DEVICE_TABLE(spi, arizona_spi_ids);
 266
 267 #ifdef CONFIG_OF
 268 static const struct of_device_id arizona_spi_of_match[] = {
 269         { .compatible = "wlf,wm5102", .data = (void *)WM5102 },
 270         { .compatible = "wlf,wm5110", .data = (void *)WM5110 },
 271         { .compatible = "wlf,wm8280", .data = (void *)WM8280 },
 272         { .compatible = "wlf,wm1831", .data = (void *)WM1831 },
 273         { .compatible = "cirrus,cs47l24", .data = (void *)CS47L24 },
 274         {},
 275 };
 276 MODULE_DEVICE_TABLE(of, arizona_spi_of_match);
 277 #endif
 278
 279 static struct spi_driver arizona_spi_driver = {
 280         .driver = {
 281                 .name   = "arizona",
 282                 .pm     = pm_ptr(&arizona_pm_ops),
 283                 .of_match_table = of_match_ptr(arizona_spi_of_match),
 284                 .acpi_match_table = ACPI_PTR(arizona_acpi_match),
 285         },
 286         .probe          = arizona_spi_probe,
 287         .remove         = arizona_spi_remove,
 288         .id_table       = arizona_spi_ids,
 289 };
 290
 291 module_spi_driver(arizona_spi_driver);
 292
 293 MODULE_SOFTDEP("pre: arizona_ldo1");
 294 MODULE_DESCRIPTION("Arizona SPI bus interface");
 295 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 296 MODULE_LICENSE("GPL");