| 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 | |
| 28 | static struct platform_device *spi_gpio_dev; |
| 29 | |
| 30 | static 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 | |
| 43 | static 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 | |
| 76 | err_free_pdata: |
| 77 | kfree(spi_gpio_dev->dev.platform_data); |
| 78 | spi_gpio_dev->dev.platform_data = NULL; |
| 79 | |
| 80 | err_free_dev: |
| 81 | platform_device_put(spi_gpio_dev); |
| 82 | return err; |
| 83 | } |
| 84 | |
| 85 | static 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 | |
| 97 | static int __init wrt55agv2_spidevs_modinit(void) |
| 98 | { |
| 99 | printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n"); |
| 100 | return wrt55agv2_spidevs_init(); |
| 101 | } |
| 102 | module_init(wrt55agv2_spidevs_modinit); |
| 103 | |
| 104 | static void __exit wrt55agv2_spidevs_modexit(void) |
| 105 | { |
| 106 | wrt55agv2_spidevs_cleanup(); |
| 107 | } |
| 108 | module_exit(wrt55agv2_spidevs_modexit); |
| 109 | |
| 110 | MODULE_DESCRIPTION(DRV_DESC); |
| 111 | MODULE_VERSION(DRV_VERSION); |
| 112 | MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>"); |
| 113 | MODULE_LICENSE("GPL v2"); |
| 114 | |
| 115 | |
