LXR linux/arch/x86/platform/intel-mid/device_libs/platform

   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
  21static 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                sprintf(base_pin_name, "max7315_%d_base", nr);
  42                sprintf(intr_pin_name, "max7315_%d_int", nr);
  43        } else {
  44                strcpy(base_pin_name, "max7315_base");
  45                strcpy(intr_pin_name, "max7315_int");
  46        }
  47
  48        gpio_base = get_gpio_by_name(base_pin_name);
  49        intr = get_gpio_by_name(intr_pin_name);
  50
  51        if (gpio_base < 0)
  52                return NULL;
  53        max7315->gpio_base = gpio_base;
  54        if (intr != -1) {
  55                i2c_info->irq = intr + INTEL_MID_IRQ_OFFSET;
  56                max7315->irq_base = gpio_base + INTEL_MID_IRQ_OFFSET;
  57        } else {
  58                i2c_info->irq = -1;
  59                max7315->irq_base = -1;
  60        }
  61        return max7315;
  62}
  63
  64static const struct devs_id max7315_dev_id __initconst = {
  65        .name = "i2c_max7315",
  66        .type = SFI_DEV_TYPE_I2C,
  67        .delay = 1,
  68        .get_platform_data = &max7315_platform_data,
  69};
  70
  71static const struct devs_id max7315_2_dev_id __initconst = {
  72        .name = "i2c_max7315_2",
  73        .type = SFI_DEV_TYPE_I2C,
  74        .delay = 1,
  75        .get_platform_data = &max7315_platform_data,
  76};
  77
  78sfi_device(max7315_dev_id);
  79sfi_device(max7315_2_dev_id);
  80