arch/x86/platform/intel-mid/device_libs/platform_bcm43xx.c

   1 /*
   2  * platform_bcm43xx.c: bcm43xx platform data initilization file
   3  *
   4  * (C) Copyright 2016 Intel Corporation
   5  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; version 2
  10  * of the License.
  11  */
  12
  13 #include <linux/gpio.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/machine.h>
  16 #include <linux/regulator/fixed.h>
  17 #include <linux/sfi.h>
  18
  19 #include <asm/intel-mid.h>
  20
  21 #define WLAN_SFI_GPIO_IRQ_NAME          "WLAN-interrupt"
  22 #define WLAN_SFI_GPIO_ENABLE_NAME       "WLAN-enable"
  23
  24 #define WLAN_DEV_NAME                   "0000:00:01.3"
  25
  26 static struct regulator_consumer_supply bcm43xx_vmmc_supply = {
  27         .dev_name               = WLAN_DEV_NAME,
  28         .supply                 = "vmmc",
  29 };
  30
  31 static struct regulator_init_data bcm43xx_vmmc_data = {
  32         .constraints = {
  33                 .valid_ops_mask         = REGULATOR_CHANGE_STATUS,
  34         },
  35         .num_consumer_supplies  = 1,
  36         .consumer_supplies      = &bcm43xx_vmmc_supply,
  37 };
  38
  39 static struct fixed_voltage_config bcm43xx_vmmc = {
  40         .supply_name            = "bcm43xx-vmmc-regulator",
  41         /*
  42          * Announce 2.0V here to be compatible with SDIO specification. The
  43          * real voltage and signaling are still 1.8V.
  44          */
  45         .microvolts             = 2000000,              /* 1.8V */
  46         .gpio                   = -EINVAL,
  47         .startup_delay          = 250 * 1000,           /* 250ms */
  48         .enable_high            = 1,                    /* active high */
  49         .enabled_at_boot        = 0,                    /* disabled at boot */
  50         .init_data              = &bcm43xx_vmmc_data,
  51 };
  52
  53 static struct platform_device bcm43xx_vmmc_regulator = {
  54         .name           = "reg-fixed-voltage",
  55         .id             = PLATFORM_DEVID_AUTO,
  56         .dev = {
  57                 .platform_data  = &bcm43xx_vmmc,
  58         },
  59 };
  60
  61 static int __init bcm43xx_regulator_register(void)
  62 {
  63         int ret;
  64
  65         bcm43xx_vmmc.gpio = get_gpio_by_name(WLAN_SFI_GPIO_ENABLE_NAME);
  66         ret = platform_device_register(&bcm43xx_vmmc_regulator);
  67         if (ret) {
  68                 pr_err("%s: vmmc regulator register failed\n", __func__);
  69                 return ret;
  70         }
  71
  72         return 0;
  73 }
  74
  75 static void __init *bcm43xx_platform_data(void *info)
  76 {
  77         int ret;
  78
  79         ret = bcm43xx_regulator_register();
  80         if (ret)
  81                 return NULL;
  82
  83         pr_info("Using generic wifi platform data\n");
  84
  85         /* For now it's empty */
  86         return NULL;
  87 }
  88
  89 static const struct devs_id bcm43xx_clk_vmmc_dev_id __initconst = {
  90         .name                   = "bcm43xx_clk_vmmc",
  91         .type                   = SFI_DEV_TYPE_SD,
  92         .get_platform_data      = &bcm43xx_platform_data,
  93 };
  94
  95 sfi_device(bcm43xx_clk_vmmc_dev_id);