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 { 87 .ident = "apu", 88 .matches = { 89 DMI_MATCH(DMI_SYS_VENDOR, "PC Engines"), 90 DMI_MATCH(DMI_PRODUCT_NAME, "APU") 91 } 92 }, 93 {} 94 }; 95 MODULE_DEVICE_TABLE(dmi, apu_led_dmi_table); 96 97 static void apu1_led_brightness_set(struct led_classdev *led, enum led_brightness value) 98 { 99 struct apu_led_priv *pled = cdev_to_priv(led); 100 101 spin_lock(&apu_led->lock); 102 iowrite8(value ? APU1_LEDON : APU1_LEDOFF, pled->param.addr); 103 spin_unlock(&apu_led->lock); 104 } 105 106 static int apu_led_config(struct device *dev, struct apu_led_pdata *apuld) 107 { 108 int i; 109 int err; 110 111 apu_led->pled = devm_kcalloc(dev, 112 ARRAY_SIZE(apu1_led_profile), sizeof(struct apu_led_priv), 113 GFP_KERNEL); 114 115 if (!apu_led->pled) 116 return -ENOMEM; 117 118 for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++) { 119 struct apu_led_priv *pled = &apu_led->pled[i]; 120 struct led_classdev *led_cdev = &pled->cdev; 121 122 led_cdev->name = apu1_led_profile[i].name; 123 led_cdev->brightness = apu1_led_profile[i].brightness; 124 led_cdev->max_brightness = 1; 125 led_cdev->flags = LED_CORE_SUSPENDRESUME; 126 led_cdev->brightness_set = apu1_led_brightness_set; 127 128 pled->param.addr = devm_ioremap(dev, 129 apu1_led_profile[i].offset, APU1_IOSIZE); 130 if (!pled->param.addr) { 131 err = -ENOMEM; 132 goto error; 133 } 134 135 err = led_classdev_register(dev, led_cdev); 136 if (err) 137 goto error; 138 139 apu1_led_brightness_set(led_cdev, apu1_led_profile[i].brightness); 140 } 141 142 return 0; 143 144 error: 145 while (i-- > 0) 146 led_classdev_unregister(&apu_led->pled[i].cdev); 147 148 return err; 149 } 150 151 static int __init apu_led_probe(struct platform_device *pdev) 152 { 153 apu_led = devm_kzalloc(&pdev->dev, sizeof(*apu_led), GFP_KERNEL); 154 155 if (!apu_led) 156 return -ENOMEM; 157 158 apu_led->pdev = pdev; 159 160 spin_lock_init(&apu_led->lock); 161 return apu_led_config(&pdev->dev, apu_led); 162 } 163 164 static struct platform_driver apu_led_driver = { 165 .driver = { 166 .name = KBUILD_MODNAME, 167 }, 168 }; 169 170 static int __init apu_led_init(void) 171 { 172 struct platform_device *pdev; 173 int err; 174 175 if (!(dmi_match(DMI_SYS_VENDOR, "PC Engines") && 176 dmi_match(DMI_PRODUCT_NAME, "APU"))) { 177 pr_err("No PC Engines APUv1 board detected. For APUv2,3 support, enable CONFIG_PCENGINES_APU2\n"); 178 return -ENODEV; 179 } 180 181 pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0); 182 if (IS_ERR(pdev)) { 183 pr_err("Device allocation failed\n"); 184 return PTR_ERR(pdev); 185 } 186 187 err = platform_driver_probe(&apu_led_driver, apu_led_probe); 188 if (err) { 189 pr_err("Probe platform driver failed\n"); 190 platform_device_unregister(pdev); 191 } 192 193 return err; 194 } 195 196 static void __exit apu_led_exit(void) 197 { 198 int i; 199 200 for (i = 0; i < ARRAY_SIZE(apu1_led_profile); i++) 201 led_classdev_unregister(&apu_led->pled[i].cdev); 202 203 platform_device_unregister(apu_led->pdev); 204 platform_driver_unregister(&apu_led_driver); 205 } 206 207 module_init(apu_led_init); 208 module_exit(apu_led_exit); 209 210 MODULE_AUTHOR("Alan Mizrahi"); 211 MODULE_DESCRIPTION("PC Engines APU1 front LED driver"); 212 MODULE_LICENSE("GPL v2"); 213 MODULE_ALIAS("platform:leds_apu"); 214