drivers/leds/leds-apu.c

   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");