drivers/mfd/wm831x-spi.c

   1 /*
   2  * wm831x-spi.c  --  SPI access for Wolfson WM831x PMICs
   3  *
   4  * Copyright 2009,2010 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  *  This program is free software; you can redistribute  it and/or modify it
   9  *  under  the terms of  the GNU General  Public License as published by the
  10  *  Free Software Foundation;  either version 2 of the  License, or (at your
  11  *  option) any later version.
  12  *
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pm.h>
  18 #include <linux/spi/spi.h>
  19
  20 #include <linux/mfd/wm831x/core.h>
  21
  22 static int wm831x_spi_read_device(struct wm831x *wm831x, unsigned short reg,
  23                                   int bytes, void *dest)
  24 {
  25         u16 tx_val;
  26         u16 *d = dest;
  27         int r, ret;
  28
  29         /* Go register at a time */
  30         for (r = reg; r < reg + (bytes / 2); r++) {
  31                 tx_val = r | 0x8000;
  32
  33                 ret = spi_write_then_read(wm831x->control_data,
  34                                           (u8 *)&tx_val, 2, (u8 *)d, 2);
  35                 if (ret != 0)
  36                         return ret;
  37
  38                 *d = be16_to_cpu(*d);
  39
  40                 d++;
  41         }
  42
  43         return 0;
  44 }
  45
  46 static int wm831x_spi_write_device(struct wm831x *wm831x, unsigned short reg,
  47                                    int bytes, void *src)
  48 {
  49         struct spi_device *spi = wm831x->control_data;
  50         u16 *s = src;
  51         u16 data[2];
  52         int ret, r;
  53
  54         /* Go register at a time */
  55         for (r = reg; r < reg + (bytes / 2); r++) {
  56                 data[0] = r;
  57                 data[1] = *s++;
  58
  59                 ret = spi_write(spi, (char *)&data, sizeof(data));
  60                 if (ret != 0)
  61                         return ret;
  62         }
  63
  64         return 0;
  65 }
  66
  67 static int __devinit wm831x_spi_probe(struct spi_device *spi)
  68 {
  69         struct wm831x *wm831x;
  70         enum wm831x_parent type;
  71
  72         /* Currently SPI support for ID tables is unmerged, we're faking it */
  73         if (strcmp(spi->modalias, "wm8310") == 0)
  74                 type = WM8310;
  75         else if (strcmp(spi->modalias, "wm8311") == 0)
  76                 type = WM8311;
  77         else if (strcmp(spi->modalias, "wm8312") == 0)
  78                 type = WM8312;
  79         else if (strcmp(spi->modalias, "wm8320") == 0)
  80                 type = WM8320;
  81         else if (strcmp(spi->modalias, "wm8321") == 0)
  82                 type = WM8321;
  83         else if (strcmp(spi->modalias, "wm8325") == 0)
  84                 type = WM8325;
  85         else if (strcmp(spi->modalias, "wm8326") == 0)
  86                 type = WM8326;
  87         else {
  88                 dev_err(&spi->dev, "Unknown device type\n");
  89                 return -EINVAL;
  90         }
  91
  92         wm831x = kzalloc(sizeof(struct wm831x), GFP_KERNEL);
  93         if (wm831x == NULL)
  94                 return -ENOMEM;
  95
  96         spi->bits_per_word = 16;
  97         spi->mode = SPI_MODE_0;
  98
  99         dev_set_drvdata(&spi->dev, wm831x);
 100         wm831x->dev = &spi->dev;
 101         wm831x->control_data = spi;
 102         wm831x->read_dev = wm831x_spi_read_device;
 103         wm831x->write_dev = wm831x_spi_write_device;
 104
 105         return wm831x_device_init(wm831x, type, spi->irq);
 106 }
 107
 108 static int __devexit wm831x_spi_remove(struct spi_device *spi)
 109 {
 110         struct wm831x *wm831x = dev_get_drvdata(&spi->dev);
 111
 112         wm831x_device_exit(wm831x);
 113
 114         return 0;
 115 }
 116
 117 static int wm831x_spi_suspend(struct device *dev)
 118 {
 119         struct wm831x *wm831x = dev_get_drvdata(dev);
 120
 121         return wm831x_device_suspend(wm831x);
 122 }
 123
 124 static const struct dev_pm_ops wm831x_spi_pm = {
 125         .freeze = wm831x_spi_suspend,
 126         .suspend = wm831x_spi_suspend,
 127 };
 128
 129 static struct spi_driver wm8310_spi_driver = {
 130         .driver = {
 131                 .name   = "wm8310",
 132                 .bus    = &spi_bus_type,
 133                 .owner  = THIS_MODULE,
 134                 .pm     = &wm831x_spi_pm,
 135         },
 136         .probe          = wm831x_spi_probe,
 137         .remove         = __devexit_p(wm831x_spi_remove),
 138 };
 139
 140 static struct spi_driver wm8311_spi_driver = {
 141         .driver = {
 142                 .name   = "wm8311",
 143                 .bus    = &spi_bus_type,
 144                 .owner  = THIS_MODULE,
 145                 .pm     = &wm831x_spi_pm,
 146         },
 147         .probe          = wm831x_spi_probe,
 148         .remove         = __devexit_p(wm831x_spi_remove),
 149 };
 150
 151 static struct spi_driver wm8312_spi_driver = {
 152         .driver = {
 153                 .name   = "wm8312",
 154                 .bus    = &spi_bus_type,
 155                 .owner  = THIS_MODULE,
 156                 .pm     = &wm831x_spi_pm,
 157         },
 158         .probe          = wm831x_spi_probe,
 159         .remove         = __devexit_p(wm831x_spi_remove),
 160 };
 161
 162 static struct spi_driver wm8320_spi_driver = {
 163         .driver = {
 164                 .name   = "wm8320",
 165                 .bus    = &spi_bus_type,
 166                 .owner  = THIS_MODULE,
 167                 .pm     = &wm831x_spi_pm,
 168         },
 169         .probe          = wm831x_spi_probe,
 170         .remove         = __devexit_p(wm831x_spi_remove),
 171 };
 172
 173 static struct spi_driver wm8321_spi_driver = {
 174         .driver = {
 175                 .name   = "wm8321",
 176                 .bus    = &spi_bus_type,
 177                 .owner  = THIS_MODULE,
 178                 .pm     = &wm831x_spi_pm,
 179         },
 180         .probe          = wm831x_spi_probe,
 181         .remove         = __devexit_p(wm831x_spi_remove),
 182 };
 183
 184 static struct spi_driver wm8325_spi_driver = {
 185         .driver = {
 186                 .name   = "wm8325",
 187                 .bus    = &spi_bus_type,
 188                 .owner  = THIS_MODULE,
 189                 .pm     = &wm831x_spi_pm,
 190         },
 191         .probe          = wm831x_spi_probe,
 192         .remove         = __devexit_p(wm831x_spi_remove),
 193 };
 194
 195 static struct spi_driver wm8326_spi_driver = {
 196         .driver = {
 197                 .name   = "wm8326",
 198                 .bus    = &spi_bus_type,
 199                 .owner  = THIS_MODULE,
 200                 .pm     = &wm831x_spi_pm,
 201         },
 202         .probe          = wm831x_spi_probe,
 203         .remove         = __devexit_p(wm831x_spi_remove),
 204 };
 205
 206 static int __init wm831x_spi_init(void)
 207 {
 208         int ret;
 209
 210         ret = spi_register_driver(&wm8310_spi_driver);
 211         if (ret != 0)
 212                 pr_err("Failed to register WM8310 SPI driver: %d\n", ret);
 213
 214         ret = spi_register_driver(&wm8311_spi_driver);
 215         if (ret != 0)
 216                 pr_err("Failed to register WM8311 SPI driver: %d\n", ret);
 217
 218         ret = spi_register_driver(&wm8312_spi_driver);
 219         if (ret != 0)
 220                 pr_err("Failed to register WM8312 SPI driver: %d\n", ret);
 221
 222         ret = spi_register_driver(&wm8320_spi_driver);
 223         if (ret != 0)
 224                 pr_err("Failed to register WM8320 SPI driver: %d\n", ret);
 225
 226         ret = spi_register_driver(&wm8321_spi_driver);
 227         if (ret != 0)
 228                 pr_err("Failed to register WM8321 SPI driver: %d\n", ret);
 229
 230         ret = spi_register_driver(&wm8325_spi_driver);
 231         if (ret != 0)
 232                 pr_err("Failed to register WM8325 SPI driver: %d\n", ret);
 233
 234         ret = spi_register_driver(&wm8326_spi_driver);
 235         if (ret != 0)
 236                 pr_err("Failed to register WM8326 SPI driver: %d\n", ret);
 237
 238         return 0;
 239 }
 240 subsys_initcall(wm831x_spi_init);
 241
 242 static void __exit wm831x_spi_exit(void)
 243 {
 244         spi_unregister_driver(&wm8326_spi_driver);
 245         spi_unregister_driver(&wm8325_spi_driver);
 246         spi_unregister_driver(&wm8321_spi_driver);
 247         spi_unregister_driver(&wm8320_spi_driver);
 248         spi_unregister_driver(&wm8312_spi_driver);
 249         spi_unregister_driver(&wm8311_spi_driver);
 250         spi_unregister_driver(&wm8310_spi_driver);
 251 }
 252 module_exit(wm831x_spi_exit);
 253
 254 MODULE_DESCRIPTION("SPI support for WM831x/2x AudioPlus PMICs");
 255 MODULE_LICENSE("GPL");
 256 MODULE_AUTHOR("Mark Brown");