mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 18:11:30 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29850 3c298f89-4303-0410-b956-a3cf2f4a3e73
248 lines
5.7 KiB
C
248 lines
5.7 KiB
C
/*
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* NXP 74HC153 - Dual 4-input multiplexer GPIO driver
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*
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* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/nxp_74hc153.h>
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#define NXP_74HC153_NUM_GPIOS 8
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#define NXP_74HC153_S0_MASK 0x1
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#define NXP_74HC153_S1_MASK 0x2
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#define NXP_74HC153_BANK_MASK 0x4
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struct nxp_74hc153_chip {
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struct device *parent;
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struct gpio_chip gpio_chip;
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struct mutex lock;
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};
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static struct nxp_74hc153_chip *gpio_to_nxp(struct gpio_chip *gc)
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{
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return container_of(gc, struct nxp_74hc153_chip, gpio_chip);
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}
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static int nxp_74hc153_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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return 0;
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}
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static int nxp_74hc153_direction_output(struct gpio_chip *gc,
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unsigned offset, int val)
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{
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return -EINVAL;
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}
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static int nxp_74hc153_get_value(struct gpio_chip *gc, unsigned offset)
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{
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struct nxp_74hc153_chip *nxp;
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struct nxp_74hc153_platform_data *pdata;
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unsigned s0;
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unsigned s1;
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unsigned pin;
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int ret;
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nxp = gpio_to_nxp(gc);
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pdata = nxp->parent->platform_data;
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s0 = !!(offset & NXP_74HC153_S0_MASK);
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s1 = !!(offset & NXP_74HC153_S1_MASK);
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pin = (offset & NXP_74HC153_BANK_MASK) ? pdata->gpio_pin_2y
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: pdata->gpio_pin_1y;
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mutex_lock(&nxp->lock);
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gpio_set_value(pdata->gpio_pin_s0, s0);
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gpio_set_value(pdata->gpio_pin_s1, s1);
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ret = gpio_get_value(pin);
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mutex_unlock(&nxp->lock);
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return ret;
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}
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static void nxp_74hc153_set_value(struct gpio_chip *gc,
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unsigned offset, int val)
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{
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/* not supported */
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}
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static int __devinit nxp_74hc153_probe(struct platform_device *pdev)
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{
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struct nxp_74hc153_platform_data *pdata;
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struct nxp_74hc153_chip *nxp;
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struct gpio_chip *gc;
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int err;
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pdata = pdev->dev.platform_data;
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if (pdata == NULL) {
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dev_dbg(&pdev->dev, "no platform data specified\n");
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return -EINVAL;
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}
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nxp = kzalloc(sizeof(struct nxp_74hc153_chip), GFP_KERNEL);
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if (nxp == NULL) {
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dev_err(&pdev->dev, "no memory for private data\n");
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return -ENOMEM;
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}
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err = gpio_request(pdata->gpio_pin_s0, dev_name(&pdev->dev));
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if (err) {
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dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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pdata->gpio_pin_s0, err);
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goto err_free_nxp;
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}
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err = gpio_request(pdata->gpio_pin_s1, dev_name(&pdev->dev));
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if (err) {
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dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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pdata->gpio_pin_s1, err);
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goto err_free_s0;
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}
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err = gpio_request(pdata->gpio_pin_1y, dev_name(&pdev->dev));
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if (err) {
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dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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pdata->gpio_pin_1y, err);
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goto err_free_s1;
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}
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err = gpio_request(pdata->gpio_pin_2y, dev_name(&pdev->dev));
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if (err) {
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dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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pdata->gpio_pin_2y, err);
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goto err_free_1y;
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}
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err = gpio_direction_output(pdata->gpio_pin_s0, 0);
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if (err) {
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dev_err(&pdev->dev,
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"unable to set direction of gpio %u, err=%d\n",
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pdata->gpio_pin_s0, err);
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goto err_free_2y;
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}
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err = gpio_direction_output(pdata->gpio_pin_s1, 0);
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if (err) {
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dev_err(&pdev->dev,
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"unable to set direction of gpio %u, err=%d\n",
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pdata->gpio_pin_s1, err);
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goto err_free_2y;
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}
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err = gpio_direction_input(pdata->gpio_pin_1y);
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if (err) {
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dev_err(&pdev->dev,
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"unable to set direction of gpio %u, err=%d\n",
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pdata->gpio_pin_1y, err);
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goto err_free_2y;
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}
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err = gpio_direction_input(pdata->gpio_pin_2y);
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if (err) {
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dev_err(&pdev->dev,
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"unable to set direction of gpio %u, err=%d\n",
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pdata->gpio_pin_2y, err);
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goto err_free_2y;
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}
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nxp->parent = &pdev->dev;
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mutex_init(&nxp->lock);
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gc = &nxp->gpio_chip;
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gc->direction_input = nxp_74hc153_direction_input;
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gc->direction_output = nxp_74hc153_direction_output;
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gc->get = nxp_74hc153_get_value;
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gc->set = nxp_74hc153_set_value;
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gc->can_sleep = 1;
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gc->base = pdata->gpio_base;
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gc->ngpio = NXP_74HC153_NUM_GPIOS;
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gc->label = dev_name(nxp->parent);
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gc->dev = nxp->parent;
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gc->owner = THIS_MODULE;
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err = gpiochip_add(&nxp->gpio_chip);
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if (err) {
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dev_err(&pdev->dev, "unable to add gpio chip, err=%d\n", err);
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goto err_free_2y;
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}
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platform_set_drvdata(pdev, nxp);
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return 0;
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err_free_2y:
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gpio_free(pdata->gpio_pin_2y);
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err_free_1y:
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gpio_free(pdata->gpio_pin_1y);
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err_free_s1:
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gpio_free(pdata->gpio_pin_s1);
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err_free_s0:
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gpio_free(pdata->gpio_pin_s0);
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err_free_nxp:
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kfree(nxp);
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return err;
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}
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static int nxp_74hc153_remove(struct platform_device *pdev)
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{
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struct nxp_74hc153_chip *nxp = platform_get_drvdata(pdev);
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struct nxp_74hc153_platform_data *pdata = pdev->dev.platform_data;
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if (nxp) {
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int err;
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err = gpiochip_remove(&nxp->gpio_chip);
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if (err) {
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dev_err(&pdev->dev,
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"unable to remove gpio chip, err=%d\n",
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err);
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return err;
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}
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gpio_free(pdata->gpio_pin_2y);
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gpio_free(pdata->gpio_pin_1y);
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gpio_free(pdata->gpio_pin_s1);
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gpio_free(pdata->gpio_pin_s0);
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kfree(nxp);
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platform_set_drvdata(pdev, NULL);
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}
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return 0;
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}
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static struct platform_driver nxp_74hc153_driver = {
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.probe = nxp_74hc153_probe,
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.remove = __devexit_p(nxp_74hc153_remove),
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.driver = {
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.name = NXP_74HC153_DRIVER_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init nxp_74hc153_init(void)
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{
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return platform_driver_register(&nxp_74hc153_driver);
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}
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subsys_initcall(nxp_74hc153_init);
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static void __exit nxp_74hc153_exit(void)
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{
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platform_driver_unregister(&nxp_74hc153_driver);
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}
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module_exit(nxp_74hc153_exit);
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC153");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" NXP_74HC153_DRIVER_NAME);
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