/* * w1-gpio - GPIO w1 bus master driver * * Copyright (C) 2007 Ville Syrjala * * 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 #include #include #include #include #include #include #include #include #include #include #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; } 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); } static void w1_gpio_write_bit_val(void *data, u8 bit) { struct w1_gpio_platform_data *pdata = data; gpio_set_value(pdata->pin, bit); } static u8 w1_gpio_read_bit(void *data) { struct w1_gpio_platform_data *pdata = data; return gpio_get_value(pdata->pin) ? 1 : 0; } #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; } 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; } 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; } 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; } 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; } 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 "); MODULE_LICENSE("GPL"); td>annotate.c44411logplain -rw-r--r--annotate.h5583logplain -rw-r--r--auxtrace.c47774logplain -rw-r--r--auxtrace.h22142logplain -rw-r--r--block-range.c6948logplain -rw-r--r--block-range.h1607logplain -rw-r--r--bpf-loader.c40787logplain -rw-r--r--bpf-loader.h6215logplain -rw-r--r--bpf-prologue.c11226logplain -rw-r--r--bpf-prologue.h847logplain -rw-r--r--build-id.c19054logplain -rw-r--r--build-id.h1859logplain d---------c++184logplain -rw-r--r--cache.h733logplain -rw-r--r--call-path.c2893logplain -rw-r--r--call-path.h2203logplain -rw-r--r--callchain.c29332logplain -rw-r--r--callchain.h7881logplain -rw-r--r--cgroup.c3195logplain -rw-r--r--cgroup.h359logplain -rw-r--r--cloexec.c1950logplain -rw-r--r--cloexec.h251logplain -rw-r--r--color.c4787logplain -rw-r--r--color.h1647logplain -rw-r--r--comm.c2239logplain -rw-r--r--comm.h561logplain -rw-r--r--config.c16262logplain -rw-r--r--config.h2113logplain -rw-r--r--counts.c1026logplain -rw-r--r--counts.h790logplain -rw-r--r--cpumap.c12627logplain -rw-r--r--cpumap.h1954logplain -rw-r--r--cs-etm.h2061logplain -rw-r--r--ctype.c2018logplain -rw-r--r--data-convert-bt.c36671logplain -rw-r--r--data-convert-bt.h302logplain -rw-r--r--data-convert.h141logplain -rw-r--r--data.c3459logplain -rw-r--r--data.h1369logplain -rw-r--r--db-export.c11434logplain -rw-r--r--db-export.h3816logplain -rw-r--r--debug.c4417logplain -rw-r--r--debug.h2023logplain -rw-r--r--demangle-java.c4219logplain -rw-r--r--demangle-java.h249logplain -rw-r--r--demangle-rust.c6602logplain -rw-r--r--demangle-rust.h170logplain -rw-r--r--drv_configs.c1834logplain -rw-r--r--drv_configs.h844logplain -rw-r--r--dso.c31994logplain -rw-r--r--dso.h10399logplain -rw-r--r--dwarf-aux.c33828logplain -rw-r--r--dwarf-aux.h5101logplain -rw-r--r--dwarf-regs.c1816logplain -rw-r--r--env.c1884logplain -rw-r--r--env.h1268logplain -rw-r--r--event.c36670logplain -rw-r--r--event.h15997logplain -rw-r--r--evlist.c47104logplain -rw-r--r--evlist.h12584logplain -rw-r--r--evsel.c63917logplain -rw-r--r--evsel.h13041logplain -rw-r--r--evsel_fprintf.c5831logplain -rw-r--r--find-vdso-map.c581logplain -rw-r--r--genelf.c11653logplain -rw-r--r--genelf.h1814logplain -rw-r--r--genelf_debug.c14374logplain -rwxr-xr-xgenerate-cmdlist.sh1141logplain -rw-r--r--group.h122logplain -rw-r--r--header.c73410logplain -rw-r--r--header.h4365logplain -rw-r--r--help-unknown-cmd.c3221logplain