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

   1 /*
   2  * platform_max7315.c: max7315 platform data initialization file
   3  *
   4  * (C) Copyright 2013 Intel Corporation
   5  * Author: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@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/init.h>
  14 #include <linux/gpio.h>
  15 #include <linux/i2c.h>
  16 #include <linux/platform_data/pca953x.h>
  17 #include <asm/intel-mid.h>
  18
  19 #define MAX7315_NUM 2
  20
  21 static void __init *max7315_platform_data(void *info)
  22 {
  23         static struct pca953x_platform_data max7315_pdata[MAX7315_NUM];
  24         static int nr;
  25         struct pca953x_platform_data *max7315 = &max7315_pdata[nr];
  26         struct i2c_board_info *i2c_info = info;
  27         int gpio_base, intr;
  28         char base_pin_name[SFI_NAME_LEN + 1];
  29         char intr_pin_name[SFI_NAME_LEN + 1];
  30
  31         if (nr == MAX7315_NUM) {
  32                 pr_err("too many max7315s, we only support %d\n",
  33                                 MAX7315_NUM);
  34                 return NULL;
  35         }
  36         /* we have several max7315 on the board, we only need load several
  37          * instances of the same pca953x driver to cover them
  38          */
  39         strcpy(i2c_info->type, "max7315");
  40         if (nr++) {
  41                 snprintf(base_pin_name, sizeof(base_pin_name),
  42                          "max7315_%d_base", nr);
  43                 snprintf(intr_pin_name, sizeof(intr_pin_name),
  44                          "max7315_%d_int", nr);
  45         } else {
  46                 strcpy(base_pin_name, "max7315_base");
  47                 strcpy(intr_pin_name, "max7315_int");
  48         }
  49
  50         gpio_base = get_gpio_by_name(base_pin_name);
  51         intr = get_gpio_by_name(intr_pin_name);
  52
  53         if (gpio_base < 0)
  54                 return NULL;
  55         max7315->gpio_base = gpio_base;
  56         if (intr != -1) {
  57                 i2c_info->irq = intr + INTEL_MID_IRQ_OFFSET;
  58                 max7315->irq_base = gpio_base + INTEL_MID_IRQ_OFFSET;
  59         } else {
  60                 i2c_info->irq = -1;
  61                 max7315->irq_base = -1;
  62         }
  63         return max7315;
  64 }
  65
  66 static const struct devs_id max7315_dev_id __initconst = {
  67         .name = "i2c_max7315",
  68         .type = SFI_DEV_TYPE_I2C,
  69         .delay = 1,
  70         .get_platform_data = &max7315_platform_data,
  71 };
  72
  73 static const struct devs_id max7315_2_dev_id __initconst = {
  74         .name = "i2c_max7315_2",
  75         .type = SFI_DEV_TYPE_I2C,
  76         .delay = 1,
  77         .get_platform_data = &max7315_platform_data,
  78 };
  79
  80 sfi_device(max7315_dev_id);
  81 sfi_device(max7315_2_dev_id);