arch/x86/platform/intel-mid/device_libs/platform_pcal9555a.c

   1 /*
   2  * PCAL9555a platform data initilization file
   3  *
   4  * Copyright (C) 2016, Intel Corporation
   5  *
   6  * Authors: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   7  *          Dan O'Donovan <dan@emutex.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; version 2
  12  * of the License.
  13  */
  14
  15 #include <linux/gpio.h>
  16 #include <linux/init.h>
  17 #include <linux/i2c.h>
  18 #include <linux/platform_data/pca953x.h>
  19 #include <linux/sfi.h>
  20
  21 #include <asm/intel-mid.h>
  22
  23 #define PCAL9555A_NUM   4
  24
  25 static struct pca953x_platform_data pcal9555a_pdata[PCAL9555A_NUM];
  26 static int nr;
  27
  28 static void __init *pcal9555a_platform_data(void *info)
  29 {
  30         struct i2c_board_info *i2c_info = info;
  31         char *type = i2c_info->type;
  32         struct pca953x_platform_data *pcal9555a;
  33         char base_pin_name[SFI_NAME_LEN + 1];
  34         char intr_pin_name[SFI_NAME_LEN + 1];
  35         int gpio_base, intr;
  36
  37         snprintf(base_pin_name, sizeof(base_pin_name), "%s_base", type);
  38         snprintf(intr_pin_name, sizeof(intr_pin_name), "%s_int", type);
  39
  40         gpio_base = get_gpio_by_name(base_pin_name);
  41         intr = get_gpio_by_name(intr_pin_name);
  42
  43         /* Check if the SFI record valid */
  44         if (gpio_base == -1)
  45                 return NULL;
  46
  47         if (nr >= PCAL9555A_NUM) {
  48                 pr_err("%s: Too many instances, only %d supported\n", __func__,
  49                        PCAL9555A_NUM);
  50                 return NULL;
  51         }
  52
  53         pcal9555a = &pcal9555a_pdata[nr++];
  54         pcal9555a->gpio_base = gpio_base;
  55
  56         if (intr >= 0) {
  57                 i2c_info->irq = intr + INTEL_MID_IRQ_OFFSET;
  58                 pcal9555a->irq_base = gpio_base + INTEL_MID_IRQ_OFFSET;
  59         } else {
  60                 i2c_info->irq = -1;
  61                 pcal9555a->irq_base = -1;
  62         }
  63
  64         strcpy(type, "pcal9555a");
  65         return pcal9555a;
  66 }
  67
  68 static const struct devs_id pcal9555a_1_dev_id __initconst = {
  69         .name                   = "pcal9555a-1",
  70         .type                   = SFI_DEV_TYPE_I2C,
  71         .delay                  = 1,
  72         .get_platform_data      = &pcal9555a_platform_data,
  73 };
  74
  75 static const struct devs_id pcal9555a_2_dev_id __initconst = {
  76         .name                   = "pcal9555a-2",
  77         .type                   = SFI_DEV_TYPE_I2C,
  78         .delay                  = 1,
  79         .get_platform_data      = &pcal9555a_platform_data,
  80 };
  81
  82 static const struct devs_id pcal9555a_3_dev_id __initconst = {
  83         .name                   = "pcal9555a-3",
  84         .type                   = SFI_DEV_TYPE_I2C,
  85         .delay                  = 1,
  86         .get_platform_data      = &pcal9555a_platform_data,
  87 };
  88
  89 static const struct devs_id pcal9555a_4_dev_id __initconst = {
  90         .name                   = "pcal9555a-4",
  91         .type                   = SFI_DEV_TYPE_I2C,
  92         .delay                  = 1,
  93         .get_platform_data      = &pcal9555a_platform_data,
  94 };
  95
  96 sfi_device(pcal9555a_1_dev_id);
  97 sfi_device(pcal9555a_2_dev_id);
  98 sfi_device(pcal9555a_3_dev_id);
  99 sfi_device(pcal9555a_4_dev_id);