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
max7315_platform_data(void * info)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 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
64 static 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
71 static 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
78 sfi_device(max7315_dev_id);
79 sfi_device(max7315_2_dev_id);
80