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_GPIO59_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 { .name = "apu:simswap" }, 82 }; 83 84 static const struct gpio_led_platform_data apu2_leds_pdata = { 85 .num_leds = ARRAY_SIZE(apu2_leds), 86 .leds = apu2_leds, 87 }; 88 89 static struct gpiod_lookup_table gpios_led_table = { 90 .dev_id = "leds-gpio", 91 .table = { 92 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED1, 93 NULL, 0, GPIO_ACTIVE_LOW), 94 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED2, 95 NULL, 1, GPIO_ACTIVE_LOW), 96 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_LED3, 97 NULL, 2, GPIO_ACTIVE_LOW), 98 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_REG_SIMSWAP, 99 NULL, 3, GPIO_ACTIVE_LOW), 100 } 101 }; 102 103 /* gpio keyboard device */ 104 105 static struct gpio_keys_button apu2_keys_buttons[] = { 106 { 107 .code = KEY_RESTART, 108 .active_low = 1, 109 .desc = "front button", 110 .type = EV_KEY, 111 .debounce_interval = 10, 112 .value = 1, 113 }, 114 }; 115 116 static const struct gpio_keys_platform_data apu2_keys_pdata = { 117 .buttons = apu2_keys_buttons, 118 .nbuttons = ARRAY_SIZE(apu2_keys_buttons), 119 .poll_interval = 100, 120 .rep = 0, 121 .name = "apu2-keys", 122 }; 123 124 static struct gpiod_lookup_table gpios_key_table = { 125 .dev_id = "gpio-keys-polled", 126 .table = { 127 GPIO_LOOKUP_IDX(AMD_FCH_GPIO_DRIVER_NAME, APU2_GPIO_LINE_MODESW, 128 NULL, 0, GPIO_ACTIVE_LOW), 129 } 130 }; 131 132 /* board setup */ 133 134 /* note: matching works on string prefix, so "apu2" must come before "apu" */ 135 static const struct dmi_system_id apu_gpio_dmi_table[] __initconst = { 136 137 /* APU2 w/ legacy bios < 4.0.8 */ 138 { 139 .ident = "apu2", 140 .matches = { 141 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 142 DMI_MATCH(DMI_BOARD_NAME, "APU2") 143 }, 144 .driver_data = (void *)&board_apu2, 145 }, 146 /* APU2 w/ legacy bios >= 4.0.8 */ 147 { 148 .ident = "apu2", 149 .matches = { 150 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 151 DMI_MATCH(DMI_BOARD_NAME, "apu2") 152 }, 153 .driver_data = (void *)&board_apu2, 154 }, 155 /* APU2 w/ maainline bios */ 156 { 157 .ident = "apu2", 158 .matches = { 159 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 160 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2") 161 }, 162 .driver_data = (void *)&board_apu2, 163 }, 164 165 /* APU3 w/ legacy bios < 4.0.8 */ 166 { 167 .ident = "apu3", 168 .matches = { 169 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 170 DMI_MATCH(DMI_BOARD_NAME, "APU3") 171 }, 172 .driver_data = (void *)&board_apu2, 173 }, 174 /* APU3 w/ legacy bios >= 4.0.8 */ 175 { 176 .ident = "apu3", 177 .matches = { 178 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 179 DMI_MATCH(DMI_BOARD_NAME, "apu3") 180 }, 181 .driver_data = (void *)&board_apu2, 182 }, 183 /* APU3 w/ mainline bios */ 184 { 185 .ident = "apu3", 186 .matches = { 187 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 188 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu3") 189 }, 190 .driver_data = (void *)&board_apu2, 191 }, 192 {} 193 }; 194 195 static struct platform_device *apu_gpio_pdev; 196 static struct platform_device *apu_leds_pdev; 197 static struct platform_device *apu_keys_pdev; 198 199 static struct platform_device * __init apu_create_pdev( 200 const char *name, 201 const void *pdata, 202 size_t sz) 203 { 204 struct platform_device *pdev; 205 206 pdev = platform_device_register_resndata(NULL, 207 name, 208 PLATFORM_DEVID_NONE, 209 NULL, 210 0, 211 pdata, 212 sz); 213 214 if (IS_ERR(pdev)) 215 pr_err("failed registering %s: %ld\n", name, PTR_ERR(pdev)); 216 217 return pdev; 218 } 219 220 static int __init apu_board_init(void) 221 { 222 const struct dmi_system_id *id; 223 224 id = dmi_first_match(apu_gpio_dmi_table); 225 if (!id) { 226 pr_err("failed to detect apu board via dmi\n"); 227 return -ENODEV; 228 } 229 230 gpiod_add_lookup_table(&gpios_led_table); 231 gpiod_add_lookup_table(&gpios_key_table); 232 233 apu_gpio_pdev = apu_create_pdev( 234 AMD_FCH_GPIO_DRIVER_NAME, 235 id->driver_data, 236 sizeof(struct amd_fch_gpio_pdata)); 237 238 apu_leds_pdev = apu_create_pdev( 239 "leds-gpio", 240 &apu2_leds_pdata, 241 sizeof(apu2_leds_pdata)); 242 243 apu_keys_pdev = apu_create_pdev( 244 "gpio-keys-polled", 245 &apu2_keys_pdata, 246 sizeof(apu2_keys_pdata)); 247 248 return 0; 249 } 250 251 static void __exit apu_board_exit(void) 252 { 253 gpiod_remove_lookup_table(&gpios_led_table); 254 gpiod_remove_lookup_table(&gpios_key_table); 255 256 platform_device_unregister(apu_keys_pdev); 257 platform_device_unregister(apu_leds_pdev); 258 platform_device_unregister(apu_gpio_pdev); 259 } 260 261 module_init(apu_board_init); 262 module_exit(apu_board_exit); 263 264 MODULE_AUTHOR("Enrico Weigelt, metux IT consult <info@metux.net>"); 265 MODULE_DESCRIPTION("PC Engines APUv2/APUv3 board GPIO/LED/keys driver"); 266 MODULE_LICENSE("GPL"); 267 MODULE_DEVICE_TABLE(dmi, apu_gpio_dmi_table); 268 MODULE_ALIAS("platform:pcengines-apuv2"); 269 MODULE_SOFTDEP("pre: platform:" AMD_FCH_GPIO_DRIVER_NAME " platform:leds-gpio platform:gpio_keys_polled"); 270