package/kernel/leds-apu2/src/leds-apu2.c

   1 /*
   2 *  APU2 LED/GPIO Driver
   3 *  Copyright (c) 2016 Christian Lamparter <chunkeey (at) googlemail.com>
   4 *
   5 *  Based on gpio-apu2.c - AMD FCH GPIO support for PC-Engines APU-2 board
   6 *
   7 *  Copyright (c) 2015  Carsten Spiess <fli4l at carsten-spiess.de>
   8 *
   9 *  This program is free software; you can redistribute it and/or modify
  10 *  it under the terms of the GNU General Public License as published by
  11 *  the Free Software Foundation; either version 2 of the License, or
  12 *  (at your option) any later version.
  13 *
  14 *  This program is distributed in the hope that it will be useful,
  15 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 *  GNU General Public License for more details.
  18 *
  19 *  You should have received a copy of the GNU General Public License
  20 *  along with this program; if not, write to the Free Software
  21 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include <linux/module.h>
  25 #include <linux/types.h>
  26 #include <linux/miscdevice.h>
  27 #include <linux/gpio.h>
  28 #include <linux/init.h>
  29 #include <linux/pci.h>
  30 #include <linux/ioport.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/uaccess.h>
  33 #include <linux/io.h>
  34 #include <linux/version.h>
  35 #include <linux/dmi.h>
  36 #include <linux/string.h>
  37
  38 #include <linux/leds.h>
  39 #include <linux/input.h>
  40 #include <linux/gpio_keys.h>
  41
  42 #define DEVNAME                 "leds-apu2"
  43
  44 #define FCH_ACPI_MMIO_BASE      0xFED80000
  45 #define FCH_GPIO_BASE           (FCH_ACPI_MMIO_BASE + 0x1500)
  46 #define FCH_GPIO_SIZE           0x300
  47
  48 #define APU_NUM_GPIO            4
  49
  50 #define GPIO_BIT_DIR            23
  51 #define GPIO_BIT_WRITE          22
  52 #define GPIO_BIT_READ           16
  53
  54 /* internal variables */
  55 static struct pci_dev *gpio_apu2_pci;
  56 static DEFINE_SPINLOCK (gpio_lock);
  57
  58 /* the watchdog platform device */
  59 static struct platform_device *gpio_apu2_platform_device;
  60 static struct platform_device *leddev;
  61 static struct platform_device *keydev;
  62
  63 static const struct pci_device_id gpio_apu2_pci_tbl[] ={
  64         {PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID, PCI_ANY_ID},
  65         { 0, } /* End of list */
  66 };
  67 MODULE_DEVICE_TABLE (pci, gpio_apu2_pci_tbl);
  68
  69 /* EGPIO89=GPIO32, AGPIO68=GPIO57, AGPIO69=GPIO58, AGPIO70=GPIO59 */
  70 static u8 gpio_offset[APU_NUM_GPIO] = {89, 68, 69, 70};
  71
  72 static void __iomem *gpio_addr[APU_NUM_GPIO] = {NULL, NULL, NULL, NULL};
  73
  74 static int gpio_apu2_get_dir (struct gpio_chip *chip, unsigned offset)
  75 {
  76         u32 val;
  77
  78         val = ~ioread32 (gpio_addr[offset]);
  79
  80         return (val >> GPIO_BIT_DIR) & 1;
  81 }
  82
  83 static int gpio_apu2_dir_in (struct gpio_chip *gc, unsigned offset)
  84 {
  85         u32 val;
  86
  87         spin_lock_bh (&gpio_lock);
  88
  89         val = ioread32 (gpio_addr[offset]);
  90         val &= ~BIT(GPIO_BIT_DIR);
  91         iowrite32 (val, gpio_addr[offset]);
  92
  93         spin_unlock_bh (&gpio_lock);
  94
  95         return 0;
  96 }
  97
  98 static int gpio_apu2_dir_out (struct gpio_chip *chip, unsigned offset,
  99                 int value)
 100 {
 101         u32 val;
 102
 103         spin_lock_bh (&gpio_lock);
 104
 105         val = ioread32 (gpio_addr[offset]);
 106         val |= BIT(GPIO_BIT_DIR);
 107         iowrite32 (val, gpio_addr[offset]);
 108
 109         spin_unlock_bh (&gpio_lock);
 110
 111         return 0;
 112 }
 113
 114 static int gpio_apu2_get_data (struct gpio_chip *chip, unsigned offset)
 115 {
 116         u32 val;
 117
 118         val = ioread32 (gpio_addr[offset]);
 119
 120         return (val >> GPIO_BIT_READ) & 1;
 121 }
 122
 123 static void gpio_apu2_set_data (struct gpio_chip *chip, unsigned offset, int value)
 124 {
 125         u32 val;
 126
 127         spin_lock_bh (&gpio_lock);
 128
 129         val = ioread32 (gpio_addr[offset]);
 130
 131         if (value)
 132                 val |= BIT(GPIO_BIT_WRITE);
 133         else
 134                 val &= ~BIT(GPIO_BIT_WRITE);
 135
 136         iowrite32 (val, gpio_addr[offset]);
 137
 138         spin_unlock_bh (&gpio_lock);
 139 }
 140
 141 static struct gpio_chip gpio_apu2_chip = {
 142         .label = DEVNAME,
 143         .owner = THIS_MODULE,
 144         .base = -1,
 145         .ngpio = APU_NUM_GPIO,
 146         .get_direction = gpio_apu2_get_dir,
 147         .direction_input = gpio_apu2_dir_in,
 148         .direction_output = gpio_apu2_dir_out,
 149         .get = gpio_apu2_get_data,
 150         .set = gpio_apu2_set_data,
 151 };
 152
 153 /*
 154  *
 155  */
 156 static int gpio_apu2_probe (struct platform_device *dev)
 157 {
 158         int ret = 0;
 159         int i;
 160         struct pci_dev *pci_dev = NULL;
 161
 162         /* Match the PCI device */
 163         for_each_pci_dev (pci_dev) {
 164                 if (pci_match_id (gpio_apu2_pci_tbl, pci_dev) != NULL) {
 165                         gpio_apu2_pci = pci_dev;
 166                         break;
 167                 }
 168         }
 169
 170         if (!gpio_apu2_pci)
 171                 return -ENODEV;
 172
 173         pr_info ("%s: PCI Revision ID: 0x%x\n", DEVNAME, gpio_apu2_pci->revision);
 174
 175         /* Determine type of southbridge chipset */
 176         if (gpio_apu2_pci->revision < 0x40) {
 177                 return -EACCES;
 178         }
 179
 180         /* Request memory region for GPIO's */
 181         if (!devm_request_mem_region (&dev->dev, FCH_GPIO_BASE,
 182                 FCH_GPIO_SIZE, DEVNAME)){
 183                 pr_err ("%s: request GPIO mem region failed\n", DEVNAME);
 184                 return -ENXIO;
 185         }
 186
 187         /* Map IO's for GPIO's */
 188         for (i = 0; i < APU_NUM_GPIO; i++) {
 189                 gpio_addr[i] = devm_ioremap (&dev->dev,
 190                         FCH_GPIO_BASE + (gpio_offset[i] * sizeof (u32)), sizeof (u32));
 191                 if (!gpio_addr[i]) {
 192                         pr_err ("%s: map GPIO%d address failed\n", DEVNAME, gpio_offset[i]);
 193                         return -ENXIO;
 194                 }
 195         }
 196
 197 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,5,0)
 198         gpio_apu2_chip.dev = &dev->dev;
 199 #else
 200         gpio_apu2_chip.parent = &dev->dev;
 201 #endif
 202         ret = gpiochip_add (&gpio_apu2_chip);
 203         if (ret) {
 204                 pr_err ("%s: adding gpiochip failed\n", DEVNAME);
 205         }
 206
 207         return ret;
 208 }
 209
 210 static int gpio_apu2_remove (struct platform_device *dev)
 211 {
 212 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
 213         int ret;
 214         ret = gpiochip_remove (&gpio_apu2_chip);
 215 #else /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
 216         gpiochip_remove (&gpio_apu2_chip);
 217 #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0) */
 218         return 0;
 219 }
 220
 221 static struct platform_driver gpio_apu2_driver = {
 222         .probe = gpio_apu2_probe,
 223         .remove = gpio_apu2_remove,
 224         .driver = {
 225                 .owner = THIS_MODULE,
 226                 .name = DEVNAME
 227         }
 228 };
 229
 230 static struct gpio_led apu2_leds_gpio[] = {
 231         {
 232                 .name           = "apu2:green:power",
 233                 .gpio           = 509,
 234                 .active_low     = 1,
 235         },
 236         {
 237                 .name           = "apu2:green:led2",
 238                 .gpio           = 510,
 239                 .active_low     = 1,
 240         },
 241         {
 242                 .name           = "apu2:green:led3",
 243                 .gpio           = 511,
 244                 .active_low     = 1,
 245         },
 246 };
 247
 248 static struct gpio_keys_button apu2_gpio_keys[] = {
 249         {
 250                 .desc           = "Reset button",
 251                 .type           = EV_KEY,
 252                 .code           = KEY_RESTART,
 253                 .debounce_interval = 60,
 254                 .gpio           = 508,
 255                 .active_low     = 1,
 256         },
 257 };
 258
 259 static void register_gpio_keys_polled(int id, unsigned poll_interval,
 260                                       unsigned nbuttons,
 261                                       struct gpio_keys_button *buttons)
 262 {
 263         struct gpio_keys_platform_data pdata = { };
 264         int err;
 265
 266         keydev = platform_device_alloc("gpio-keys-polled", id);
 267         if (!keydev) {
 268                 printk(KERN_ERR "Failed to allocate gpio-keys platform device\n");
 269                 return;
 270         }
 271
 272         pdata.poll_interval = poll_interval;
 273         pdata.nbuttons = nbuttons;
 274         pdata.buttons = buttons;
 275
 276         err = platform_device_add_data(keydev, &pdata, sizeof(pdata));
 277         if (err) {
 278                 dev_err(&keydev->dev, "failed to add platform data to key driver (%d)", err);
 279                 goto err_put_pdev;
 280         }
 281
 282         err = platform_device_add(keydev);
 283         if (err) {
 284                 dev_err(&keydev->dev, "failed to register key platform device (%d)", err);
 285                 goto err_put_pdev;
 286         }
 287
 288         return;
 289
 290 err_put_pdev:
 291         platform_device_put(keydev);
 292         keydev = NULL;
 293 }
 294
 295 static void register_leds_gpio(int id, unsigned num_leds, struct gpio_led *leds)
 296 {
 297         struct gpio_led_platform_data pdata = { };
 298         int err;
 299
 300         leddev = platform_device_alloc("leds-gpio", id);
 301         if (!leddev) {
 302                 printk(KERN_ERR "Failed to allocate leds-gpio platform device\n");
 303                 return;
 304         }
 305
 306         pdata.num_leds = num_leds;
 307         pdata.leds = leds;
 308
 309         err = platform_device_add_data(leddev, &pdata, sizeof(pdata));
 310         if (err) {
 311                 dev_err(&leddev->dev, "failed to add platform data to key driver (%d)", err);
 312                 goto err_put_pdev;
 313         }
 314
 315         err = platform_device_add(leddev);
 316         if (err) {
 317                 dev_err(&leddev->dev, "failed to register key platform device (%d)", err);
 318                 goto err_put_pdev;
 319         }
 320
 321         return;
 322
 323 err_put_pdev:
 324         platform_device_put(leddev);
 325         leddev = NULL;
 326 }
 327
 328 static int __init gpio_apu2_init (void)
 329 {
 330         int err;
 331         const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
 332         const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
 333
 334         pr_info ("%s: load APU2/LED GPIO driver module\n", DEVNAME);
 335
 336         err = platform_driver_register (&gpio_apu2_driver);
 337         if (err)
 338                 goto exit;
 339
 340         gpio_apu2_platform_device = platform_device_register_simple (DEVNAME, -1, NULL, 0);
 341         if (IS_ERR(gpio_apu2_platform_device)) {
 342                 err = PTR_ERR(gpio_apu2_platform_device);
 343                 goto exit_driver;
 344         }
 345
 346         pr_info ("%s: APU2 GPIO/LED driver module loaded\n", DEVNAME);
 347
 348         register_leds_gpio(-1, ARRAY_SIZE(apu2_leds_gpio), apu2_leds_gpio);
 349         register_gpio_keys_polled(-1, 20, ARRAY_SIZE(apu2_gpio_keys), apu2_gpio_keys);
 350         return 0;
 351
 352 exit_driver:
 353         platform_driver_unregister (&gpio_apu2_driver);
 354 exit:
 355         return err;
 356 }
 357
 358 static void __exit gpio_apu2_exit (void)
 359 {
 360         platform_device_unregister (gpio_apu2_platform_device);
 361         platform_device_unregister (leddev);
 362         platform_device_unregister (keydev);
 363         platform_driver_unregister (&gpio_apu2_driver);
 364         pr_info ("%s: APU2 GPIO/LED driver module unloaded\n", DEVNAME);
 365 }
 366
 367 MODULE_AUTHOR ("Carsten Spiess <fli4l at carsten-spiess.de>");
 368 MODULE_DESCRIPTION("GPIO driver for AMD FCH on PC-Engines APU-2");
 369 MODULE_LICENSE("GPL");
 370
 371 module_init (gpio_apu2_init);
 372 module_exit (gpio_apu2_exit);