1/*
2 * SPI driver for the Linksys WRT55AG v2 board.
3 *
4 * Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
5 *
6 * This file was based on the mmc_over_gpio driver:
7 *	Copyright 2008 Michael Buesch <mb@bu3sch.de>
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
12 */
13
14#include <linux/platform_device.h>
15#include <linux/spi/spi_gpio_old.h>
16#include <linux/module.h>
17
18#define DRV_NAME	"wrt55agv2-spidevs"
19#define DRV_DESC	"SPI driver for the WRT55AG v2 board"
20#define DRV_VERSION	"0.1.0"
21#define PFX		DRV_NAME ": "
22
23#define GPIO_PIN_MISO	1
24#define GPIO_PIN_CS	2
25#define GPIO_PIN_CLK	3
26#define GPIO_PIN_MOSI	4
27
28static struct platform_device *spi_gpio_dev;
29
30static int __init boardinfo_setup(struct spi_board_info *bi,
31		struct spi_master *master, void *data)
32{
33
34	strlcpy(bi->modalias, "spi-ks8995", sizeof(bi->modalias));
35
36	bi->max_speed_hz = 5000000 /* Hz */;
37	bi->bus_num = master->bus_num;
38	bi->mode = SPI_MODE_0;
39
40	return 0;
41}
42
43static int __init wrt55agv2_spidevs_init(void)
44{
45	struct spi_gpio_platform_data pdata;
46	int err;
47
48	spi_gpio_dev = platform_device_alloc("spi-gpio", 0);
49	if (!spi_gpio_dev) {
50		printk(KERN_ERR PFX "no memory for spi-gpio device\n");
51		return -ENOMEM;
52	}
53
54	memset(&pdata, 0, sizeof(pdata));
55	pdata.pin_miso = GPIO_PIN_MISO;
56	pdata.pin_cs = GPIO_PIN_CS;
57	pdata.pin_clk = GPIO_PIN_CLK;
58	pdata.pin_mosi = GPIO_PIN_MOSI;
59	pdata.cs_activelow = 1;
60	pdata.no_spi_delay = 1;
61	pdata.boardinfo_setup = boardinfo_setup;
62	pdata.boardinfo_setup_data = NULL;
63
64	err = platform_device_add_data(spi_gpio_dev, &pdata, sizeof(pdata));
65	if (err)
66		goto err_free_dev;
67
68	err = platform_device_register(spi_gpio_dev);
69	if (err) {
70		printk(KERN_ERR PFX "unable to register device\n");
71		goto err_free_pdata;
72	}
73
74	return 0;
75
76err_free_pdata:
77	kfree(spi_gpio_dev->dev.platform_data);
78	spi_gpio_dev->dev.platform_data = NULL;
79
80err_free_dev:
81	platform_device_put(spi_gpio_dev);
82	return err;
83}
84
85static void __exit wrt55agv2_spidevs_cleanup(void)
86{
87	if (!spi_gpio_dev)
88		return;
89
90	platform_device_unregister(spi_gpio_dev);
91
92	kfree(spi_gpio_dev->dev.platform_data);
93	spi_gpio_dev->dev.platform_data = NULL;
94	platform_device_put(spi_gpio_dev);
95}
96
97static int __init wrt55agv2_spidevs_modinit(void)
98{
99	printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
100	return wrt55agv2_spidevs_init();
101}
102module_init(wrt55agv2_spidevs_modinit);
103
104static void __exit wrt55agv2_spidevs_modexit(void)
105{
106	wrt55agv2_spidevs_cleanup();
107}
108module_exit(wrt55agv2_spidevs_modexit);
109
110MODULE_DESCRIPTION(DRV_DESC);
111MODULE_VERSION(DRV_VERSION);
112MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
113MODULE_LICENSE("GPL v2");
114
115