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