1/* 2 * platform_max7315.c: max7315 platform data initilization 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