forked from Minki/linux
34ccd8738e
Commit 8a1861d997
("w1-gpio: Simplify & get rid of defines") removed the
compile guards from the device-tree id table, thereby generating a
warning when building without device-tree support.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
225 lines
5.0 KiB
C
225 lines
5.0 KiB
C
/*
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* w1-gpio - GPIO w1 bus master driver
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*
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* Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
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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
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* as published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/w1-gpio.h>
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#include <linux/gpio.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include "../w1.h"
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#include "../w1_int.h"
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static void w1_gpio_write_bit_dir(void *data, u8 bit)
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{
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struct w1_gpio_platform_data *pdata = data;
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if (bit)
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gpio_direction_input(pdata->pin);
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else
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gpio_direction_output(pdata->pin, 0);
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}
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static void w1_gpio_write_bit_val(void *data, u8 bit)
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{
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struct w1_gpio_platform_data *pdata = data;
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gpio_set_value(pdata->pin, bit);
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}
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static u8 w1_gpio_read_bit(void *data)
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{
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struct w1_gpio_platform_data *pdata = data;
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return gpio_get_value(pdata->pin) ? 1 : 0;
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}
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#if defined(CONFIG_OF)
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static struct of_device_id w1_gpio_dt_ids[] = {
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{ .compatible = "w1-gpio" },
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{}
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};
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MODULE_DEVICE_TABLE(of, w1_gpio_dt_ids);
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#endif
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static int w1_gpio_probe_dt(struct platform_device *pdev)
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{
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struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
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struct device_node *np = pdev->dev.of_node;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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if (of_get_property(np, "linux,open-drain", NULL))
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pdata->is_open_drain = 1;
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pdata->pin = of_get_gpio(np, 0);
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pdata->ext_pullup_enable_pin = of_get_gpio(np, 1);
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pdev->dev.platform_data = pdata;
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return 0;
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}
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static int w1_gpio_probe(struct platform_device *pdev)
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{
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struct w1_bus_master *master;
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struct w1_gpio_platform_data *pdata;
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struct pinctrl *pinctrl;
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int err;
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pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
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if (IS_ERR(pinctrl))
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dev_warn(&pdev->dev, "unable to select pin group\n");
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if (of_have_populated_dt()) {
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err = w1_gpio_probe_dt(pdev);
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if (err < 0) {
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dev_err(&pdev->dev, "Failed to parse DT\n");
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return err;
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}
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}
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pdata = pdev->dev.platform_data;
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if (!pdata) {
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dev_err(&pdev->dev, "No configuration data\n");
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return -ENXIO;
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}
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master = kzalloc(sizeof(struct w1_bus_master), GFP_KERNEL);
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if (!master) {
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dev_err(&pdev->dev, "Out of memory\n");
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return -ENOMEM;
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}
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err = gpio_request(pdata->pin, "w1");
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if (err) {
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dev_err(&pdev->dev, "gpio_request (pin) failed\n");
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goto free_master;
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}
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if (gpio_is_valid(pdata->ext_pullup_enable_pin)) {
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err = gpio_request_one(pdata->ext_pullup_enable_pin,
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GPIOF_INIT_LOW, "w1 pullup");
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if (err < 0) {
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dev_err(&pdev->dev, "gpio_request_one "
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"(ext_pullup_enable_pin) failed\n");
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goto free_gpio;
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}
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}
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master->data = pdata;
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master->read_bit = w1_gpio_read_bit;
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if (pdata->is_open_drain) {
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gpio_direction_output(pdata->pin, 1);
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master->write_bit = w1_gpio_write_bit_val;
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} else {
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gpio_direction_input(pdata->pin);
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master->write_bit = w1_gpio_write_bit_dir;
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}
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err = w1_add_master_device(master);
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if (err) {
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dev_err(&pdev->dev, "w1_add_master device failed\n");
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goto free_gpio_ext_pu;
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}
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if (pdata->enable_external_pullup)
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pdata->enable_external_pullup(1);
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if (gpio_is_valid(pdata->ext_pullup_enable_pin))
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gpio_set_value(pdata->ext_pullup_enable_pin, 1);
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platform_set_drvdata(pdev, master);
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return 0;
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free_gpio_ext_pu:
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if (gpio_is_valid(pdata->ext_pullup_enable_pin))
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gpio_free(pdata->ext_pullup_enable_pin);
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free_gpio:
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gpio_free(pdata->pin);
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free_master:
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kfree(master);
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return err;
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}
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static int w1_gpio_remove(struct platform_device *pdev)
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{
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struct w1_bus_master *master = platform_get_drvdata(pdev);
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struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
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if (pdata->enable_external_pullup)
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pdata->enable_external_pullup(0);
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if (gpio_is_valid(pdata->ext_pullup_enable_pin))
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gpio_set_value(pdata->ext_pullup_enable_pin, 0);
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w1_remove_master_device(master);
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gpio_free(pdata->pin);
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kfree(master);
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return 0;
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}
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#ifdef CONFIG_PM
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static int w1_gpio_suspend(struct platform_device *pdev, pm_message_t state)
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{
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struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
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if (pdata->enable_external_pullup)
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pdata->enable_external_pullup(0);
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return 0;
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}
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static int w1_gpio_resume(struct platform_device *pdev)
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{
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struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
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if (pdata->enable_external_pullup)
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pdata->enable_external_pullup(1);
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return 0;
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}
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#else
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#define w1_gpio_suspend NULL
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#define w1_gpio_resume NULL
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#endif
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static struct platform_driver w1_gpio_driver = {
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.driver = {
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.name = "w1-gpio",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(w1_gpio_dt_ids),
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},
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.probe = w1_gpio_probe,
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.remove = w1_gpio_remove,
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.suspend = w1_gpio_suspend,
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.resume = w1_gpio_resume,
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};
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module_platform_driver(w1_gpio_driver);
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MODULE_DESCRIPTION("GPIO w1 bus master driver");
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MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>");
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MODULE_LICENSE("GPL");
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