drivers/platform/x86/pcengines-apuv2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 /*
   4  * PC-Engines APUv2/APUv3 board platform driver
   5  * for GPIO buttons and LEDs
   6  *
   7  * Copyright (C) 2018 metux IT consult
   8  * Author: Enrico Weigelt <info@metux.net>
   9  */
  10
  11 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/dmi.h>
  14 #include <linux/err.h>
  15 #include <linux/kernel.h>
  16 #include <linux/leds.h>
  17 #include <linux/module.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/gpio_keys.h>
  20 #include <linux/gpio/machine.h>
  21 #include <linux/input.h>
  22 #include <linux/platform_data/gpio/gpio-amd-fch.h>
  23
  24 /*
  25  * NOTE: this driver only supports APUv2/3 - not APUv1, as this one
  26  * has completely different register layouts.
  27  */
  28
  29 /* Register mappings */
  30 #define APU2_GPIO_REG_LED1              AMD_FCH_GPIO_REG_GPIO57
  31 #define APU2_GPIO_REG_LED2              AMD_FCH_GPIO_REG_GPIO58
  32 #define APU2_GPIO_REG_LED3              AMD_FCH_GPIO_REG_GPIO59_DEVSLP1
  33 #define APU2_GPIO_REG_MODESW            AMD_FCH_GPIO_REG_GPIO32_GE1
  34 #define APU2_GPIO_REG_SIMSWAP           AMD_FCH_GPIO_REG_GPIO33_GE2
  35 #define APU2_GPIO_REG_MPCIE2            AMD_FCH_GPIO_REG_GPIO55_DEVSLP0
  36 #define APU2_GPIO_REG_MPCIE3            AMD_FCH_GPIO_REG_GPIO51
  37
  38 /* Order in which the GPIO lines are defined in the register list */
  39 #define APU2_GPIO_LINE_LED1             0
  40 #define APU2_GPIO_LINE_LED2             1
  41 #define APU2_GPIO_LINE_LED3             2
  42 #define APU2_GPIO_LINE_MODESW           3
  43 #define APU2_GPIO_LINE_SIMSWAP          4
  44 #define APU2_GPIO_LINE_MPCIE2           5
  45 #define APU2_GPIO_LINE_MPCIE3           6
  46
  47 /* GPIO device */
  48
  49 static int apu2_gpio_regs[] = {
  50         [APU2_GPIO_LINE_LED1]           = APU2_GPIO_REG_LED1,
  51         [APU2_GPIO_LINE_LED2]           = APU2_GPIO_REG_LED2,
  52         [APU2_GPIO_LINE_LED3]           = APU2_GPIO_REG_LED3,
  53         [APU2_GPIO_LINE_MODESW]         = APU2_GPIO_REG_MODESW,
  54         [APU2_GPIO_LINE_SIMSWAP]        = APU2_GPIO_REG_SIMSWAP,
  55         [APU2_GPIO_LINE_MPCIE2]         = APU2_GPIO_REG_MPCIE2,
  56         [APU2_GPIO_LINE_MPCIE3]         = APU2_GPIO_REG_MPCIE3,
  57 };
  58
  59 static const char * const apu2_gpio_names[] = {
  60         [APU2_GPIO_LINE_LED1]           = "front-led1",
  61         [APU2_GPIO_LINE_LED2]           = "front-led2",
  62         [APU2_GPIO_LINE_LED3]           = "front-led3",
  63         [APU2_GPIO_LINE_MODESW]         = "front-button",
  64         [APU2_GPIO_LINE_SIMSWAP]        = "simswap",
  65         [APU2_GPIO_LINE_MPCIE2]         = "mpcie2_reset",
  66         [APU2_GPIO_LINE_MPCIE3]         = "mpcie3_reset",
  67 };
  68
  69 static const struct amd_fch_gpio_pdata board_apu2 = {
  70         .gpio_num       = ARRAY_SIZE(apu2_gpio_regs),
  71         .gpio_reg       = apu2_gpio_regs,
  72         .gpio_names     = apu2_gpio_names,
  73 };
  74
  75 /* GPIO LEDs device */
  76
  77 static const struct gpio_led apu2_leds[] = {
  78         { .name = "apu:green:1" },
  79         { .name = "apu:green:2" },
  80         { .name = "apu:green:3" },
  81 };
  82
  83 static const struct gpio_led_platform_data apu2_leds_pdata = {
  84         .num_leds       = ARRAY_SIZE(apu2_leds),
  85         .leds           = apu2_leds,
  86 };
  87
  88 static struct gpiod_lookup_table gpios_led_table = {
  89         .dev_id = "leds-gpio",
  90         .table = {
  91                 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED1,
  92                                 NULL, 0, GPIO_ACTIVE_LOW),
  93                 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED2,
  94                                 NULL, 1, GPIO_ACTIVE_LOW),
  95                 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED3,
  96                                 NULL, 2, GPIO_ACTIVE_LOW),
  97                 {} /* Terminating entry */
  98         }
  99 };
 100
 101 /* GPIO keyboard device */
 102
 103 static struct gpio_keys_button apu2_keys_buttons[] = {
 104         {
 105                 .code                   = KEY_RESTART,
 106                 .active_low             = 1,
 107                 .desc                   = "front button",
 108                 .type                   = EV_KEY,
 109                 .debounce_interval      = 10,
 110                 .value                  = 1,
 111         },
 112 };
 113
 114 static const struct gpio_keys_platform_data apu2_keys_pdata = {
 115         .buttons        = apu2_keys_buttons,
 116         .nbuttons       = ARRAY_SIZE(apu2_keys_buttons),
 117         .poll_interval  = 100,
 118         .rep            = 0,
 119         .name           = "apu2-keys",
 120 };
 121
 122 static struct gpiod_lookup_table gpios_key_table = {
 123         .dev_id = "gpio-keys-polled",
 124         .table = {
 125                 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_MODESW,
 126                                 NULL, 0, GPIO_ACTIVE_LOW),
 127                 {} /* Terminating entry */
 128         }
 129 };
 130
 131 /* Board setup */
 132
 133 /* Note: matching works on string prefix, so "apu2" must come before "apu" */
 134 static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = {
 135
 136         /* APU2 w/ legacy BIOS < 4.0.8 */
 137         {
 138                 .ident          = "apu2",
 139                 .matches        = {
 140                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 141                         DMI_MATCH(DMI_BOARD_NAME, "APU2")
 142                 },
 143                 .driver_data    = (void *)&board_apu2,
 144         },
 145         /* APU2 w/ legacy BIOS >= 4.0.8 */
 146         {
 147                 .ident          = "apu2",
 148                 .matches        = {
 149                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 150                         DMI_MATCH(DMI_BOARD_NAME, "apu2")
 151                 },
 152                 .driver_data    = (void *)&board_apu2,
 153         },
 154         /* APU2 w/ mainline BIOS */
 155         {
 156                 .ident          = "apu2",
 157                 .matches        = {
 158                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 159                         DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2")
 160                 },
 161                 .driver_data    = (void *)&board_apu2,
 162         },
 163
 164         /* APU3 w/ legacy BIOS < 4.0.8 */
 165         {
 166                 .ident          = "apu3",
 167                 .matches        = {
 168                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 169                         DMI_MATCH(DMI_BOARD_NAME, "APU3")
 170                 },
 171                 .driver_data = (void *)&board_apu2,
 172         },
 173         /* APU3 w/ legacy BIOS >= 4.0.8 */
 174         {
 175                 .ident       = "apu3",
 176                 .matches     = {
 177                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 178                         DMI_MATCH(DMI_BOARD_NAME, "apu3")
 179                 },
 180                 .driver_data = (void *)&board_apu2,
 181         },
 182         /* APU3 w/ mainline BIOS */
 183         {
 184                 .ident       = "apu3",
 185                 .matches     = {
 186                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 187                         DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3")
 188                 },
 189                 .driver_data = (void *)&board_apu2,
 190         },
 191         /* APU4 w/ legacy BIOS < 4.0.8 */
 192         {
 193                 .ident        = "apu4",
 194                 .matches    = {
 195                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 196                         DMI_MATCH(DMI_BOARD_NAME, "APU4")
 197                 },
 198                 .driver_data = (void *)&board_apu2,
 199         },
 200         /* APU4 w/ legacy BIOS >= 4.0.8 */
 201         {
 202                 .ident       = "apu4",
 203                 .matches     = {
 204                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 205                         DMI_MATCH(DMI_BOARD_NAME, "apu4")
 206                 },
 207                 .driver_data = (void *)&board_apu2,
 208         },
 209         /* APU4 w/ mainline BIOS */
 210         {
 211                 .ident       = "apu4",
 212                 .matches     = {
 213                         DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"),
 214                         DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu4")
 215                 },
 216                 .driver_data = (void *)&board_apu2,
 217         },
 218         {}
 219 };
 220
 221 static struct platform_device *apu_gpio_pdev;
 222 static struct platform_device *apu_leds_pdev;
 223 static struct platform_device *apu_keys_pdev;
 224
 225 static struct platform_device * __init apu_create_pdev(
 226         const char *name,
 227         const void *pdata,
 228         size_t sz)
 229 {
 230         struct platform_device *pdev;
 231
 232         pdev = platform_device_register_resndata(NULL,
 233                 name,
 234                 PLATFORM_DEVID_NONE,
 235                 NULL,
 236                 0,
 237                 pdata,
 238                 sz);
 239
 240         if (IS_ERR(pdev))
 241                 pr_err("failed registering %s: %ld\n", name, PTR_ERR(pdev));
 242
 243         return pdev;
 244 }
 245
 246 static int __init apu_board_init(void)
 247 {
 248         const struct dmi_system_id *id;
 249
 250         id = dmi_first_match(apu_gpio_dmi_table);
 251         if (!id) {
 252                 pr_err("failed to detect APU board via DMI\n");
 253                 return -ENODEV;
 254         }
 255
 256         gpiod_add_lookup_table(&gpios_led_table);
 257         gpiod_add_lookup_table(&gpios_key_table);
 258
 259         apu_gpio_pdev = apu_create_pdev(
 260                 AMD_FCH_GPIO_DRIVER_NAME,
 261                 id->driver_data,
 262                 sizeof(struct amd_fch_gpio_pdata));
 263
 264         apu_leds_pdev = apu_create_pdev(
 265                 "leds-gpio",
 266                 &apu2_leds_pdata,
 267                 sizeof(apu2_leds_pdata));
 268
 269         apu_keys_pdev = apu_create_pdev(
 270                 "gpio-keys-polled",
 271                 &apu2_keys_pdata,
 272                 sizeof(apu2_keys_pdata));
 273
 274         return 0;
 275 }
 276
 277 static void __exit apu_board_exit(void)
 278 {
 279         gpiod_remove_lookup_table(&gpios_led_table);
 280         gpiod_remove_lookup_table(&gpios_key_table);
 281
 282         platform_device_unregister(apu_keys_pdev);
 283         platform_device_unregister(apu_leds_pdev);
 284         platform_device_unregister(apu_gpio_pdev);
 285 }
 286
 287 module_init(apu_board_init);
 288 module_exit(apu_board_exit);
 289
 290 MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>");
 291 MODULE_DESCRIPTION("PC Engines APUv2/APUv3 board GPIO/LEDs/keys driver");
 292 MODULE_LICENSE("GPL");
 293 MODULE_DEVICE_TABLE(dmi, apu_gpio_dmi_table);
 294 MODULE_SOFTDEP("pre: platform:" AMD_FCH_GPIO_DRIVER_NAME " platform:leds-gpio platform:gpio_keys_polled");