1 /* 2 * drivers/leds/leds-apu.c 3 * Copyright (C) 2017 Alan Mizrahi, alan at mizrahi dot com dot ve 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the names of the copyright holders nor the names of its 14 * contributors may be used to endorse or promote products derived from 15 * this software without specific prior written permission. 16 * 17 * Alternatively, this software may be distributed under the terms of the 18 * GNU General Public License ("GPL") version 2 as published by the Free 19 * Software Foundation. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <linux/dmi.h> 35 #include <linux/err.h> 36 #include <linux/init.h> 37 #include <linux/io.h> 38 #include <linux/kernel.h> 39 #include <linux/leds.h> 40 #include <linux/module.h> 41 #include <linux/platform_device.h> 42 43 #define APU1_FCH_ACPI_MMIO_BASE 0xFED80000 44 #define APU1_FCH_GPIO_BASE (APU1_FCH_ACPI_MMIO_BASE + 0x01BD) 45 #define APU1_LEDON 0x08 46 #define APU1_LEDOFF 0xC8 47 #define APU1_NUM_GPIO 3 48 #define APU1_IOSIZE sizeof(u8) 49 50 #define APU2_FCH_ACPI_MMIO_BASE 0xFED80000 51 #define APU2_FCH_GPIO_BASE (APU2_FCH_ACPI_MMIO_BASE + 0x1500) 52 #define APU2_GPIO_BIT_WRITE 22 53 #define APU2_APU2_NUM_GPIO 4 54 #define APU2_IOSIZE sizeof(u32) 55 56 /* LED access parameters */ 57 struct apu_param { 58 void __iomem *addr; /* for ioread/iowrite */ 59 }; 60 61 /* LED private data */ 62 struct apu_led_priv { 63 struct led_classdev cdev; 64 struct apu_param param; 65 }; 66 #define cdev_to_priv(c) container_of(c, struct apu_led_priv, cdev) 67 68 /* LED profile */ 69 struct apu_led_profile { 70 const char *name; 71 enum led_brightness brightness; 72 unsigned long offset; /* for devm_ioremap */ 73 }; 74 75 /* Supported platform types */ 76 enum apu_led_platform_types { 77 APU1_LED_PLATFORM, 78 APU2_LED_PLATFORM, 79 }; 80 81 struct apu_led_pdata { 82 struct platform_device *pdev; 83 struct apu_led_priv *pled; 84 const struct apu_led_profile *profile; 85 enum apu_led_platform_types platform; 86 int num_led_instances; 87 int iosize; /* for devm_ioremap() */ 88 spinlock_t lock; 89 }; 90 91 static struct apu_led_pdata *apu_led; 92 93 static const struct apu_led_profile apu1_led_profile[] = { 94 { "apu:green:1", LED_ON, APU1_FCH_GPIO_BASE + 0 * APU1_IOSIZE }, 95 { "apu:green:2", LED_OFF, APU1_FCH_GPIO_BASE + 1 * APU1_IOSIZE }, 96 { "apu:green:3", LED_OFF, APU1_FCH_GPIO_BASE + 2 * APU1_IOSIZE }, 97 }; 98 99 static const struct apu_led_profile apu2_led_profile[] = { 100 { "apu2:green:1", LED_ON, APU2_FCH_GPIO_BASE + 68 * APU2_IOSIZE }, 101 { "apu2:green:2", LED_OFF, APU2_FCH_GPIO_BASE + 69 * APU2_IOSIZE }, 102 { "apu2:green:3", LED_OFF, APU2_FCH_GPIO_BASE + 70 * APU2_IOSIZE }, 103 }; 104 105 static const struct dmi_system_id apu_led_dmi_table[] __initconst = { 106 { 107 .ident = "apu", 108 .matches = { 109 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 110 DMI_MATCH(DMI_PRODUCT_NAME, "APU") 111 } 112 }, 113 /* PC Engines APU2 with "Legacy" bios < 4.0.8 */ 114 { 115 .ident = "apu2", 116 .matches = { 117 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 118 DMI_MATCH(DMI_BOARD_NAME, "APU2") 119 } 120 }, 121 /* PC Engines APU2 with "Legacy" bios >= 4.0.8 */ 122 { 123 .ident = "apu2", 124 .matches = { 125 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 126 DMI_MATCH(DMI_BOARD_NAME, "apu2") 127 } 128 }, 129 /* PC Engines APU2 with "Mainline" bios */ 130 { 131 .ident = "apu2", 132 .matches = { 133 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 134 DMI_MATCH(DMI_BOARD_NAME, "PC Engines apu2") 135 } 136 }, 137 {} 138 }; 139 MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table); 140 141 static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value) 142 { 143 struct apu_led_priv *pled = cdev_to_priv(led); 144 145 spin_lock(&apu_led->lock); 146 iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr); 147 spin_unlock(&apu_led->lock); 148 } 149 150 static void apu2_led_brightness_set(struct led_classdev *led, enum led_brightness value) 151 { 152 struct apu_led_priv *pled = cdev_to_priv(led); 153 u32 value_new; 154 155 spin_lock(&apu_led->lock); 156 157 value_new = ioread32(pled->param.addr); 158 159 if (value) 160 value_new &= ~BIT(APU2_GPIO_BIT_WRITE); 161 else 162 value_new |= BIT(APU2_GPIO_BIT_WRITE); 163 164 iowrite32(value_new, pled->param.addr); 165 166 spin_unlock(&apu_led->lock); 167 } 168 169 static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld) 170 { 171 int i; 172 int err; 173 174 apu_led->pled = devm_kzalloc(dev, 175 sizeof(struct apu_led_priv) * apu_led->num_led_instances, 176 GFP_KERNEL); 177 178 if (!apu_led->pled) 179 return -ENOMEM; 180 181 for (i = 0; i < apu_led->num_led_instances; i++) { 182 struct apu_led_priv *pled = &apu_led->pled[i]; 183 struct led_classdev *led_cdev = &pled->cdev; 184 185 led_cdev->name = apu_led->profile[i].name; 186 led_cdev->brightness = apu_led->profile[i].brightness; 187 led_cdev->max_brightness = 1; 188 led_cdev->flags = LED_CORE_SUSPENDRESUME; 189 if (apu_led->platform == APU1_LED_PLATFORM) 190 led_cdev->brightness_set = apu1_led_brightness_set; 191 else if (apu_led->platform == APU2_LED_PLATFORM) 192 led_cdev->brightness_set = apu2_led_brightness_set; 193 194 pled->param.addr = devm_ioremap(dev, 195 apu_led->profile[i].offset, apu_led->iosize); 196 if (!pled->param.addr) { 197 err = -ENOMEM; 198 goto error; 199 } 200 201 err = led_classdev_register(dev, led_cdev); 202 if (err) 203 goto error; 204 205 led_cdev->brightness_set(led_cdev, apu_led->profile[i].brightness); 206 } 207 208 return 0; 209 210 error: 211 while (i-- > 0) 212 led_classdev_unregister(&apu_led->pled[i].cdev); 213 214 return err; 215 } 216 217 static int __init apu_led_probe(struct platform_device *pdev) 218 { 219 apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL); 220 221 if (!apu_led) 222 return -ENOMEM; 223 224 apu_led->pdev = pdev; 225 226 if (dmi_match(DMI_PRODUCT_NAME, "APU")) { 227 apu_led->profile = apu1_led_profile; 228 apu_led->platform = APU1_LED_PLATFORM; 229 apu_led->num_led_instances = ARRAY_SIZE(apu1_led_profile); 230 apu_led->iosize = APU1_IOSIZE; 231 } else if (dmi_match(DMI_BOARD_NAME, "APU2") || 232 dmi_match(DMI_BOARD_NAME, "apu2") || 233 dmi_match(DMI_BOARD_NAME, "PC Engines apu2")) { 234 apu_led->profile = apu2_led_profile; 235 apu_led->platform = APU2_LED_PLATFORM; 236 apu_led->num_led_instances = ARRAY_SIZE(apu2_led_profile); 237 apu_led->iosize = APU2_IOSIZE; 238 } 239 240 spin_lock_init(&apu_led->lock); 241 return apu_led_config(&pdev->dev, apu_led); 242 } 243 244 static struct platform_driver apu_led_driver = { 245 .driver = { 246 .name = KBUILD_MODNAME, 247 }, 248 }; 249 250 static int __init apu_led_init(void) 251 { 252 struct platform_device *pdev; 253 int err; 254 255 if (!dmi_match(DMI_SYS_VENDOR, "PC Engines")) { 256 pr_err("No PC Engines board detected\n"); 257 return -ENODEV; 258 } 259 if (!(dmi_match(DMI_PRODUCT_NAME, "APU") || 260 dmi_match(DMI_PRODUCT_NAME, "APU2") || 261 dmi_match(DMI_PRODUCT_NAME, "apu2") || 262 dmi_match(DMI_PRODUCT_NAME, "PC Engines apu2"))) { 263 pr_err("Unknown PC Engines board: %s\n", 264 dmi_get_system_info(DMI_PRODUCT_NAME)); 265 return -ENODEV; 266 } 267 268 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0); 269 if (IS_ERR(pdev)) { 270 pr_err("Device allocation failed\n"); 271 return PTR_ERR(pdev); 272 } 273 274 err = platform_driver_probe(&apu_led_driver, apu_led_probe); 275 if (err) { 276 pr_err("Probe platform driver failed\n"); 277 platform_device_unregister(pdev); 278 } 279 280 return err; 281 } 282 283 static void __exit apu_led_exit(void) 284 { 285 int i; 286 287 for (i = 0; i < apu_led->num_led_instances; i++) 288 led_classdev_unregister(&apu_led->pled[i].cdev); 289 290 platform_device_unregister(apu_led->pdev); 291 platform_driver_unregister(&apu_led_driver); 292 } 293 294 module_init(apu_led_init); 295 module_exit(apu_led_exit); 296 297 MODULE_AUTHOR("Alan Mizrahi"); 298 MODULE_DESCRIPTION("PC Engines APU family LED driver"); 299 MODULE_LICENSE("GPL v2"); 300 MODULE_ALIAS("platform:leds_apu"); 301