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 { 114 .ident = "apu2", 115 .matches = { 116 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 117 DMI_MATCH(DMI_BOARD_NAME, "APU2") 118 } 119 }, 120 {} 121 }; 122 MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table); 123 124 static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value) 125 { 126 struct apu_led_priv *pled = cdev_to_priv(led); 127 128 spin_lock(&apu_led->lock); 129 iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr); 130 spin_unlock(&apu_led->lock); 131 } 132 133 static void apu2_led_brightness_set(struct led_classdev *led, enum led_brightness value) 134 { 135 struct apu_led_priv *pled = cdev_to_priv(led); 136 u32 value_new; 137 138 spin_lock(&apu_led->lock); 139 140 value_new = ioread32(pled->param.addr); 141 142 if (value) 143 value_new &= ~BIT(APU2_GPIO_BIT_WRITE); 144 else 145 value_new |= BIT(APU2_GPIO_BIT_WRITE); 146 147 iowrite32(value_new, pled->param.addr); 148 149 spin_unlock(&apu_led->lock); 150 } 151 152 static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld) 153 { 154 int i; 155 int err; 156 157 apu_led->pled = devm_kzalloc(dev, 158 sizeof(struct apu_led_priv) * apu_led->num_led_instances, 159 GFP_KERNEL); 160 161 if (!apu_led->pled) 162 return -ENOMEM; 163 164 for (i = 0; i < apu_led->num_led_instances; i++) { 165 struct apu_led_priv *pled = &apu_led->pled[i]; 166 struct led_classdev *led_cdev = &pled->cdev; 167 168 led_cdev->name = apu_led->profile[i].name; 169 led_cdev->brightness = apu_led->profile[i].brightness; 170 led_cdev->max_brightness = 1; 171 led_cdev->flags = LED_CORE_SUSPENDRESUME; 172 if (apu_led->platform == APU1_LED_PLATFORM) 173 led_cdev->brightness_set = apu1_led_brightness_set; 174 else if (apu_led->platform == APU2_LED_PLATFORM) 175 led_cdev->brightness_set = apu2_led_brightness_set; 176 177 pled->param.addr = devm_ioremap(dev, 178 apu_led->profile[i].offset, apu_led->iosize); 179 if (!pled->param.addr) { 180 err = -ENOMEM; 181 goto error; 182 } 183 184 err = led_classdev_register(dev, led_cdev); 185 if (err) 186 goto error; 187 188 led_cdev->brightness_set(led_cdev, apu_led->profile[i].brightness); 189 } 190 191 return 0; 192 193 error: 194 while (i-- > 0) 195 led_classdev_unregister(&apu_led->pled[i].cdev); 196 197 return err; 198 } 199 200 static int __init apu_led_probe(struct platform_device *pdev) 201 { 202 apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL); 203 204 if (!apu_led) 205 return -ENOMEM; 206 207 apu_led->pdev = pdev; 208 209 if (dmi_match(DMI_BOARD_NAME, "APU")) { 210 apu_led->profile = apu1_led_profile; 211 apu_led->platform = APU1_LED_PLATFORM; 212 apu_led->num_led_instances = ARRAY_SIZE(apu1_led_profile); 213 apu_led->iosize = APU1_IOSIZE; 214 } else if (dmi_match(DMI_BOARD_NAME, "APU2")) { 215 apu_led->profile = apu2_led_profile; 216 apu_led->platform = APU2_LED_PLATFORM; 217 apu_led->num_led_instances = ARRAY_SIZE(apu2_led_profile); 218 apu_led->iosize = APU2_IOSIZE; 219 } 220 221 spin_lock_init(&apu_led->lock); 222 return apu_led_config(&pdev->dev, apu_led); 223 } 224 225 static struct platform_driver apu_led_driver = { 226 .driver = { 227 .name = KBUILD_MODNAME, 228 }, 229 }; 230 231 static int __init apu_led_init(void) 232 { 233 struct platform_device *pdev; 234 int err; 235 236 if (!dmi_match(DMI_SYS_VENDOR, "PC Engines")) { 237 pr_err("No PC Engines board detected\n"); 238 return -ENODEV; 239 } 240 if (!(dmi_match(DMI_PRODUCT_NAME, "APU") || dmi_match(DMI_PRODUCT_NAME, "APU2"))) { 241 pr_err("Unknown PC Engines board: %s\n", 242 dmi_get_system_info(DMI_PRODUCT_NAME)); 243 return -ENODEV; 244 } 245 246 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0); 247 if (IS_ERR(pdev)) { 248 pr_err("Device allocation failed\n"); 249 return PTR_ERR(pdev); 250 } 251 252 err = platform_driver_probe(&apu_led_driver, apu_led_probe); 253 if (err) { 254 pr_err("Probe platform driver failed\n"); 255 platform_device_unregister(pdev); 256 } 257 258 return err; 259 } 260 261 static void __exit apu_led_exit(void) 262 { 263 int i; 264 265 for (i = 0; i < apu_led->num_led_instances; i++) 266 led_classdev_unregister(&apu_led->pled[i].cdev); 267 268 platform_device_unregister(apu_led->pdev); 269 platform_driver_unregister(&apu_led_driver); 270 } 271 272 module_init(apu_led_init); 273 module_exit(apu_led_exit); 274 275 MODULE_AUTHOR("Alan Mizrahi"); 276 MODULE_DESCRIPTION("PC Engines APU family LED driver"); 277 MODULE_LICENSE("GPL v2"); 278 MODULE_ALIAS("platform:leds_apu"); 279