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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * platform_bcm43xx.c: bcm43xx platform data initialization file
   4  *
   5  * (C) Copyright 2016 Intel Corporation
   6  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   7  */
   8
   9 #include <linux/gpio/machine.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/regulator/machine.h>
  12 #include <linux/regulator/fixed.h>
  13 #include <linux/sfi.h>
  14
  15 #include <asm/intel-mid.h>
  16
  17 #define WLAN_SFI_GPIO_IRQ_NAME          "WLAN-interrupt"
  18 #define WLAN_SFI_GPIO_ENABLE_NAME       "WLAN-enable"
  19
  20 #define WLAN_DEV_NAME                   "0000:00:01.3"
  21
  22 static struct regulator_consumer_supply bcm43xx_vmmc_supply = {
  23         .dev_name               = WLAN_DEV_NAME,
  24         .supply                 = "vmmc",
  25 };
  26
  27 static struct regulator_init_data bcm43xx_vmmc_data = {
  28         .constraints = {
  29                 .valid_ops_mask         = REGULATOR_CHANGE_STATUS,
  30         },
  31         .num_consumer_supplies  = 1,
  32         .consumer_supplies      = &bcm43xx_vmmc_supply,
  33 };
  34
  35 static struct fixed_voltage_config bcm43xx_vmmc = {
  36         .supply_name            = "bcm43xx-vmmc-regulator",
  37         /*
  38          * Announce 2.0V here to be compatible with SDIO specification. The
  39          * real voltage and signaling are still 1.8V.
  40          */
  41         .microvolts             = 2000000,              /* 1.8V */
  42         .startup_delay          = 250 * 1000,           /* 250ms */
  43         .enabled_at_boot        = 0,                    /* disabled at boot */
  44         .init_data              = &bcm43xx_vmmc_data,
  45 };
  46
  47 static struct platform_device bcm43xx_vmmc_regulator = {
  48         .name           = "reg-fixed-voltage",
  49         .id             = PLATFORM_DEVID_AUTO,
  50         .dev = {
  51                 .platform_data  = &bcm43xx_vmmc,
  52         },
  53 };
  54
  55 static struct gpiod_lookup_table bcm43xx_vmmc_gpio_table = {
  56         .dev_id = "reg-fixed-voltage.0",
  57         .table  = {
  58                 GPIO_LOOKUP("0000:00:0c.0", -1, NULL, GPIO_ACTIVE_LOW),
  59                 {}
  60         },
  61 };
  62
  63 static int __init bcm43xx_regulator_register(void)
  64 {
  65         struct gpiod_lookup_table *table = &bcm43xx_vmmc_gpio_table;
  66         struct gpiod_lookup *lookup = table->table;
  67         int ret;
  68
  69         lookup[0].chip_hwnum = get_gpio_by_name(WLAN_SFI_GPIO_ENABLE_NAME);
  70         gpiod_add_lookup_table(table);
  71
  72         ret = platform_device_register(&bcm43xx_vmmc_regulator);
  73         if (ret) {
  74                 pr_err("%s: vmmc regulator register failed\n", __func__);
  75                 return ret;
  76         }
  77
  78         return 0;
  79 }
  80
  81 static void __init *bcm43xx_platform_data(void *info)
  82 {
  83         int ret;
  84
  85         ret = bcm43xx_regulator_register();
  86         if (ret)
  87                 return NULL;
  88
  89         pr_info("Using generic wifi platform data\n");
  90
  91         /* For now it's empty */
  92         return NULL;
  93 }
  94
  95 static const struct devs_id bcm43xx_clk_vmmc_dev_id __initconst = {
  96         .name                   = "bcm43xx_clk_vmmc",
  97         .type                   = SFI_DEV_TYPE_SD,
  98         .get_platform_data      = &bcm43xx_platform_data,
  99 };
 100
 101 sfi_device(bcm43xx_clk_vmmc_dev_id);