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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 35 36 #include <linux/dmi.h> 37 #include <linux/err.h> 38 #include <linux/init.h> 39 #include <linux/io.h> 40 #include <linux/kernel.h> 41 #include <linux/leds.h> 42 #include <linux/module.h> 43 #include <linux/platform_device.h> 44 45 #define APU1_FCH_ACPI_MMIO_BASE 0xFED80000 46 #define APU1_FCH_GPIO_BASE (APU1_FCH_ACPI_MMIO_BASE + 0x01BD) 47 #define APU1_LEDON 0x08 48 #define APU1_LEDOFF 0xC8 49 #define APU1_NUM_GPIO 3 50 #define APU1_IOSIZE sizeof(u8) 51 52 /* LED access parameters */ 53 struct apu_param { 54 void __iomem *addr; /* for ioread/iowrite */ 55 }; 56 57 /* LED private data */ 58 struct apu_led_priv { 59 struct led_classdev cdev; 60 struct apu_param param; 61 }; 62 #define cdev_to_priv(c) container_of(c, struct apu_led_priv, cdev) 63 64 /* LED profile */ 65 struct apu_led_profile { 66 const char *name; 67 enum led_brightness brightness; 68 unsigned long offset; /* for devm_ioremap */ 69 }; 70 71 struct apu_led_pdata { 72 struct platform_device *pdev; 73 struct apu_led_priv *pled; 74 spinlock_t lock; 75 }; 76 77 static struct apu_led_pdata *apu_led; 78 79 static const struct apu_led_profile apu1_led_profile[] = { 80 { "apu:green:1", LED_ON, APU1_FCH_GPIO_BASE + 0 * APU1_IOSIZE }, 81 { "apu:green:2", LED_OFF, APU1_FCH_GPIO_BASE + 1 * APU1_IOSIZE }, 82 { "apu:green:3", LED_OFF, APU1_FCH_GPIO_BASE + 2 * APU1_IOSIZE }, 83 }; 84 85 static const struct dmi_system_id apu_led_dmi_table[] __initconst = { 86 /* PC Engines APU with factory bios "SageBios_PCEngines_APU-45" */ 87 { 88 .ident = "apu", 89 .matches = { 90 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 91 DMI_MATCH(DMI_PRODUCT_NAME, "APU") 92 } 93 }, 94 /* PC Engines APU with "Mainline" bios >= 4.6.8 */ 95 { 96 .ident = "apu", 97 .matches = { 98 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 99 DMI_MATCH(DMI_PRODUCT_NAME, "apu1") 100 } 101 }, 102 {} 103 }; 104 MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table); 105 106 static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value) 107 { 108 struct apu_led_priv *pled = cdev_to_priv(led); 109 110 spin_lock(&apu_led->lock); 111 iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr); 112 spin_unlock(&apu_led->lock); 113 } 114 115 static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld) 116 { 117 int i; 118 int err; 119 120 apu_led->pled = devm_kcalloc(dev, 121 ARRAY_SIZE(apu1_led_profile), sizeof(struct apu_led_priv), 122 GFP_KERNEL); 123 124 if (!apu_led->pled) 125 return -ENOMEM; 126 127 for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++) { 128 struct apu_led_priv *pled = &apu_led->pled[i]; 129 struct led_classdev *led_cdev = &pled->cdev; 130 131 led_cdev->name = apu1_led_profile[i].name; 132 led_cdev->brightness = apu1_led_profile[i].brightness; 133 led_cdev->max_brightness = 1; 134 led_cdev->flags = LED_CORE_SUSPENDRESUME; 135 led_cdev->brightness_set = apu1_led_brightness_set; 136 137 pled->param.addr = devm_ioremap(dev, 138 apu1_led_profile[i].offset, APU1_IOSIZE); 139 if (!pled->param.addr) { 140 err = -ENOMEM; 141 goto error; 142 } 143 144 err = led_classdev_register(dev, led_cdev); 145 if (err) 146 goto error; 147 148 apu1_led_brightness_set(led_cdev, apu1_led_profile[i].brightness); 149 } 150 151 return 0; 152 153 error: 154 while (i-- > 0) 155 led_classdev_unregister(&apu_led->pled[i].cdev); 156 157 return err; 158 } 159 160 static int __init apu_led_probe(struct platform_device *pdev) 161 { 162 apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL); 163 164 if (!apu_led) 165 return -ENOMEM; 166 167 apu_led->pdev = pdev; 168 169 spin_lock_init(&apu_led->lock); 170 return apu_led_config(&pdev->dev, apu_led); 171 } 172 173 static struct platform_driver apu_led_driver = { 174 .driver = { 175 .name = KBUILD_MODNAME, 176 }, 177 }; 178 179 static int __init apu_led_init(void) 180 { 181 struct platform_device *pdev; 182 int err; 183 184 if (!(dmi_match(DMI_SYS_VENDOR, "PC Engines") && 185 (dmi_match(DMI_PRODUCT_NAME, "APU") || dmi_match(DMI_PRODUCT_NAME, "apu1")))) { 186 pr_err("No PC Engines APUv1 board detected. For APUv2,3 support, enable CONFIG_PCENGINES_APU2\n"); 187 return -ENODEV; 188 } 189 190 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0); 191 if (IS_ERR(pdev)) { 192 pr_err("Device allocation failed\n"); 193 return PTR_ERR(pdev); 194 } 195 196 err = platform_driver_probe(&apu_led_driver, apu_led_probe); 197 if (err) { 198 pr_err("Probe platform driver failed\n"); 199 platform_device_unregister(pdev); 200 } 201 202 return err; 203 } 204 205 static void __exit apu_led_exit(void) 206 { 207 int i; 208 209 for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++) 210 led_classdev_unregister(&apu_led->pled[i].cdev); 211 212 platform_device_unregister(apu_led->pdev); 213 platform_driver_unregister(&apu_led_driver); 214 } 215 216 module_init(apu_led_init); 217 module_exit(apu_led_exit); 218 219 MODULE_AUTHOR("Alan Mizrahi"); 220 MODULE_DESCRIPTION("PC Engines APU1 front LED driver"); 221 MODULE_LICENSE("GPL v2"); 222 MODULE_ALIAS("platform:leds_apu"); 223