114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
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/*
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* SPI driver for the Linksys WRT55AG v2 board.
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*
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* Copyright (C) 2008 Gabor Juhos <juhosg at openwrt.org>
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*
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* This file was based on the mmc_over_gpio driver:
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* Copyright 2008 Michael Buesch <mb@bu3sch.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/platform_device.h>
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#include <linux/spi/spi_gpio.h>
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#define DRV_NAME "wrt55agv2-spidevs"
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#define DRV_DESC "SPI driver for the WRT55AG v2 board"
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#define DRV_VERSION "0.1.0"
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#define PFX DRV_NAME ": "
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#define GPIO_PIN_MISO 1
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#define GPIO_PIN_CS 2
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#define GPIO_PIN_CLK 3
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#define GPIO_PIN_MOSI 4
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static struct platform_device *spi_gpio_dev;
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static int __init boardinfo_setup(struct spi_board_info *bi,
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struct spi_master *master, void *data)
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{
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strlcpy(bi->modalias, "spi-ks8995", sizeof(bi->modalias));
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bi->max_speed_hz = 5000000 /* Hz */;
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bi->bus_num = master->bus_num;
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bi->mode = SPI_MODE_0;
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return 0;
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}
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static int __init wrt55agv2_spidevs_init(void)
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{
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struct spi_gpio_platform_data pdata;
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int err;
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spi_gpio_dev = platform_device_alloc("spi-gpio", 0);
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if (!spi_gpio_dev) {
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printk(KERN_ERR PFX "no memory for spi-gpio device\n");
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return -ENOMEM;
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}
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memset(&pdata, 0, sizeof(pdata));
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pdata.pin_miso = GPIO_PIN_MISO;
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pdata.pin_cs = GPIO_PIN_CS;
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pdata.pin_clk = GPIO_PIN_CLK;
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pdata.pin_mosi = GPIO_PIN_MOSI;
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pdata.cs_activelow = 1;
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pdata.no_spi_delay = 1;
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pdata.boardinfo_setup = boardinfo_setup;
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pdata.boardinfo_setup_data = NULL;
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err = platform_device_add_data(spi_gpio_dev, &pdata, sizeof(pdata));
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if (err)
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goto err_free_dev;
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err = platform_device_register(spi_gpio_dev);
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if (err) {
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printk(KERN_ERR PFX "unable to register device\n");
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goto err_free_pdata;
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}
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return 0;
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err_free_pdata:
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kfree(spi_gpio_dev->dev.platform_data);
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spi_gpio_dev->dev.platform_data = NULL;
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err_free_dev:
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platform_device_put(spi_gpio_dev);
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return err;
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}
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static void __exit wrt55agv2_spidevs_cleanup(void)
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{
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if (!spi_gpio_dev)
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return;
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platform_device_unregister(spi_gpio_dev);
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kfree(spi_gpio_dev->dev.platform_data);
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spi_gpio_dev->dev.platform_data = NULL;
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platform_device_put(spi_gpio_dev);
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}
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static int __init wrt55agv2_spidevs_modinit(void)
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{
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printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
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return wrt55agv2_spidevs_init();
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}
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module_init(wrt55agv2_spidevs_modinit);
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static void __exit wrt55agv2_spidevs_modexit(void)
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{
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wrt55agv2_spidevs_cleanup();
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}
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module_exit(wrt55agv2_spidevs_modexit);
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MODULE_DESCRIPTION(DRV_DESC);
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MODULE_VERSION(DRV_VERSION);
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MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
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MODULE_LICENSE("GPL v2");
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