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Release 4.11 drivers/w1/masters/w1-gpio.c

/*
 * w1-gpio - GPIO w1 bus master driver
 *
 * Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/w1-gpio.h>
#include <linux/gpio.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/delay.h>

#include "../w1.h"
#include "../w1_int.h"


static u8 w1_gpio_set_pullup(void *data, int delay) { struct w1_gpio_platform_data *pdata = data; if (delay) { pdata->pullup_duration = delay; } else { if (pdata->pullup_duration) { gpio_direction_output(pdata->pin, 1); msleep(pdata->pullup_duration); gpio_direction_input(pdata->pin); } pdata->pullup_duration = 0; } return 0; }

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Evgeny Boger75100.00%1100.00%
Total75100.00%1100.00%


static void w1_gpio_write_bit_dir(void *data, u8 bit) { struct w1_gpio_platform_data *pdata = data; if (bit) gpio_direction_input(pdata->pin); else gpio_direction_output(pdata->pin, 0); }

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PersonTokensPropCommitsCommitProp
Ville Syrjälä41100.00%1100.00%
Total41100.00%1100.00%


static void w1_gpio_write_bit_val(void *data, u8 bit) { struct w1_gpio_platform_data *pdata = data; gpio_set_value(pdata->pin, bit); }

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PersonTokensPropCommitsCommitProp
Ville Syrjälä29100.00%1100.00%
Total29100.00%1100.00%


static u8 w1_gpio_read_bit(void *data) { struct w1_gpio_platform_data *pdata = data; return gpio_get_value(pdata->pin) ? 1 : 0; }

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PersonTokensPropCommitsCommitProp
Ville Syrjälä2586.21%150.00%
Daniel Mack413.79%150.00%
Total29100.00%2100.00%

#if defined(CONFIG_OF) static const struct of_device_id w1_gpio_dt_ids[] = { { .compatible = "w1-gpio" }, {} }; MODULE_DEVICE_TABLE(of, w1_gpio_dt_ids); #endif
static int w1_gpio_probe_dt(struct platform_device *pdev) { struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); struct device_node *np = pdev->dev.of_node; int gpio; pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; if (of_get_property(np, "linux,open-drain", NULL)) pdata->is_open_drain = 1; gpio = of_get_gpio(np, 0); if (gpio < 0) { if (gpio != -EPROBE_DEFER) dev_err(&pdev->dev, "Failed to parse gpio property for data pin (%d)\n", gpio); return gpio; } pdata->pin = gpio; gpio = of_get_gpio(np, 1); if (gpio == -EPROBE_DEFER) return gpio; /* ignore other errors as the pullup gpio is optional */ pdata->ext_pullup_enable_pin = gpio; pdev->dev.platform_data = pdata; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Mack10262.20%125.00%
Uwe Kleine-König3923.78%125.00%
Markus Pargmann1911.59%125.00%
Jingoo Han42.44%125.00%
Total164100.00%4100.00%


static int w1_gpio_probe(struct platform_device *pdev) { struct w1_bus_master *master; struct w1_gpio_platform_data *pdata; int err; if (of_have_populated_dt()) { err = w1_gpio_probe_dt(pdev); if (err < 0) return err; } pdata = dev_get_platdata(&pdev->dev); if (!pdata) { dev_err(&pdev->dev, "No configuration data\n"); return -ENXIO; } master = devm_kzalloc(&pdev->dev, sizeof(struct w1_bus_master), GFP_KERNEL); if (!master) { dev_err(&pdev->dev, "Out of memory\n"); return -ENOMEM; } err = devm_gpio_request(&pdev->dev, pdata->pin, "w1"); if (err) { dev_err(&pdev->dev, "gpio_request (pin) failed\n"); return err; } if (gpio_is_valid(pdata->ext_pullup_enable_pin)) { err = devm_gpio_request_one(&pdev->dev, pdata->ext_pullup_enable_pin, GPIOF_INIT_LOW, "w1 pullup"); if (err < 0) { dev_err(&pdev->dev, "gpio_request_one " "(ext_pullup_enable_pin) failed\n"); return err; } } master->data = pdata; master->read_bit = w1_gpio_read_bit; if (pdata->is_open_drain) { gpio_direction_output(pdata->pin, 1); master->write_bit = w1_gpio_write_bit_val; } else { gpio_direction_input(pdata->pin); master->write_bit = w1_gpio_write_bit_dir; master->set_pullup = w1_gpio_set_pullup; } err = w1_add_master_device(master); if (err) { dev_err(&pdev->dev, "w1_add_master device failed\n"); return err; } if (pdata->enable_external_pullup) pdata->enable_external_pullup(1); if (gpio_is_valid(pdata->ext_pullup_enable_pin)) gpio_set_value(pdata->ext_pullup_enable_pin, 1); platform_set_drvdata(pdev, master); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ville Syrjälä13942.51%112.50%
Daniel Mack8325.38%337.50%
Pantelis Antoniou6820.80%112.50%
Markus Pargmann278.26%112.50%
Evgeny Boger61.83%112.50%
Jingoo Han41.22%112.50%
Total327100.00%8100.00%


static int w1_gpio_remove(struct platform_device *pdev) { struct w1_bus_master *master = platform_get_drvdata(pdev); struct w1_gpio_platform_data *pdata = dev_get_platdata(&pdev->dev); if (pdata->enable_external_pullup) pdata->enable_external_pullup(0); if (gpio_is_valid(pdata->ext_pullup_enable_pin)) gpio_set_value(pdata->ext_pullup_enable_pin, 0); w1_remove_master_device(master); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Ville Syrjälä3852.05%125.00%
Daniel Mack3142.47%250.00%
Jingoo Han45.48%125.00%
Total73100.00%4100.00%


static int __maybe_unused w1_gpio_suspend(struct device *dev) { struct w1_gpio_platform_data *pdata = dev_get_platdata(dev); if (pdata->enable_external_pullup) pdata->enable_external_pullup(0); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Mack3284.21%133.33%
Jingoo Han37.89%133.33%
Dmitry Torokhov37.89%133.33%
Total38100.00%3100.00%


static int __maybe_unused w1_gpio_resume(struct device *dev) { struct w1_gpio_platform_data *pdata = dev_get_platdata(dev); if (pdata->enable_external_pullup) pdata->enable_external_pullup(1); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Mack3284.21%133.33%
Dmitry Torokhov37.89%133.33%
Jingoo Han37.89%133.33%
Total38100.00%3100.00%

static SIMPLE_DEV_PM_OPS(w1_gpio_pm_ops, w1_gpio_suspend, w1_gpio_resume); static struct platform_driver w1_gpio_driver = { .driver = { .name = "w1-gpio", .pm = &w1_gpio_pm_ops, .of_match_table = of_match_ptr(w1_gpio_dt_ids), }, .probe = w1_gpio_probe, .remove = w1_gpio_remove, }; module_platform_driver(w1_gpio_driver); MODULE_DESCRIPTION("GPIO w1 bus master driver"); MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
Ville Syrjälä33334.76%15.88%
Daniel Mack32233.61%423.53%
Evgeny Boger848.77%15.88%
Pantelis Antoniou818.46%211.76%
Markus Pargmann464.80%211.76%
Uwe Kleine-König394.07%15.88%
Dmitry Torokhov202.09%15.88%
Jingoo Han181.88%15.88%
Johan Hovold80.84%15.88%
Mark Brown30.31%15.88%
Tejun Heo30.31%15.88%
Fabian Frederick10.10%15.88%
Total958100.00%17100.00%
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