arch/x86/platform/intel-mid/device_libs/platform_max7315.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * platform_max7315.c: max7315 platform data initialization file
   4  *
   5  * (C) Copyright 2013 Intel Corporation
   6  * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@intel.com>
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/gpio.h>
  11 #include <linux/i2c.h>
  12 #include <linux/platform_data/pca953x.h>
  13 #include <asm/intel-mid.h>
  14
  15 #define MAX7315_NUM 2
  16
  17 static void __init *max7315_platform_data(void *info)
  18 {
  19         static struct pca953x_platform_data max7315_pdata[MAX7315_NUM];
  20         static int nr;
  21         struct pca953x_platform_data *max7315 = &max7315_pdata[nr];
  22         struct i2c_board_info *i2c_info = info;
  23         int gpio_base, intr;
  24         char base_pin_name[SFI_NAME_LEN + 1];
  25         char intr_pin_name[SFI_NAME_LEN + 1];
  26
  27         if (nr == MAX7315_NUM) {
  28                 pr_err("too many max7315s, we only support %d\n",
  29                                 MAX7315_NUM);
  30                 return NULL;
  31         }
  32         /* we have several max7315 on the board, we only need load several
  33          * instances of the same pca953x driver to cover them
  34          */
  35         strcpy(i2c_info->type, "max7315");
  36         if (nr++) {
  37                 snprintf(base_pin_name, sizeof(base_pin_name),
  38                          "max7315_%d_base", nr);
  39                 snprintf(intr_pin_name, sizeof(intr_pin_name),
  40                          "max7315_%d_int", nr);
  41         } else {
  42                 strcpy(base_pin_name, "max7315_base");
  43                 strcpy(intr_pin_name, "max7315_int");
  44         }
  45
  46         gpio_base = get_gpio_by_name(base_pin_name);
  47         intr = get_gpio_by_name(intr_pin_name);
  48
  49         if (gpio_base < 0)
  50                 return NULL;
  51         max7315->gpio_base = gpio_base;
  52         if (intr != -1) {
  53                 i2c_info->irq = intr + INTEL_MID_IRQ_OFFSET;
  54                 max7315->irq_base = gpio_base + INTEL_MID_IRQ_OFFSET;
  55         } else {
  56                 i2c_info->irq = -1;
  57                 max7315->irq_base = -1;
  58         }
  59         return max7315;
  60 }
  61
  62 static const struct devs_id max7315_dev_id __initconst = {
  63         .name = "i2c_max7315",
  64         .type = SFI_DEV_TYPE_I2C,
  65         .delay = 1,
  66         .get_platform_data = &max7315_platform_data,
  67 };
  68
  69 static const struct devs_id max7315_2_dev_id __initconst = {
  70         .name = "i2c_max7315_2",
  71         .type = SFI_DEV_TYPE_I2C,
  72         .delay = 1,
  73         .get_platform_data = &max7315_platform_data,
  74 };
  75
  76 sfi_device(max7315_dev_id);
  77 sfi_device(max7315_2_dev_id);