^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * 1-Wire implementation for the ds2780 chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2010 Indesign, LLC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author: Clifton Barnes <cabarnes@indesign-llc.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Based on w1-ds2760 driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/w1.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "w1_ds2780.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define W1_FAMILY_DS2780 0x32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) static int w1_ds2780_do_io(struct device *dev, char *buf, int addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) size_t count, int io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (addr > DS2780_DATA_SIZE || addr < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) count = min_t(int, count, DS2780_DATA_SIZE - addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (w1_reset_select_slave(sl) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) if (io) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) w1_write_8(sl->master, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) w1_write_block(sl->master, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) w1_write_8(sl->master, W1_DS2780_READ_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) w1_write_8(sl->master, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) count = w1_read_block(sl->master, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) int io)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) ret = w1_ds2780_do_io(dev, buf, addr, count, io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) EXPORT_SYMBOL(w1_ds2780_io);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (!dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) mutex_lock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (w1_reset_select_slave(sl) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) w1_write_8(sl->master, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) w1_write_8(sl->master, addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) mutex_unlock(&sl->master->bus_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) EXPORT_SYMBOL(w1_ds2780_eeprom_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct bin_attribute *bin_attr, char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) loff_t off, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct device *dev = container_of(kobj, struct device, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return w1_ds2780_io(dev, buf, off, count, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) static struct bin_attribute *w1_ds2780_bin_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) &bin_attr_w1_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static const struct attribute_group w1_ds2780_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) .bin_attrs = w1_ds2780_bin_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) static const struct attribute_group *w1_ds2780_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) &w1_ds2780_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static int w1_ds2780_add_slave(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct platform_device *pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) pdev = platform_device_alloc("ds2780-battery", PLATFORM_DEVID_AUTO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) if (!pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) pdev->dev.parent = &sl->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) ret = platform_device_add(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) goto pdev_add_failed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) dev_set_drvdata(&sl->dev, pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) pdev_add_failed:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) platform_device_put(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static void w1_ds2780_remove_slave(struct w1_slave *sl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) struct platform_device *pdev = dev_get_drvdata(&sl->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) platform_device_unregister(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) static const struct w1_family_ops w1_ds2780_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) .add_slave = w1_ds2780_add_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) .remove_slave = w1_ds2780_remove_slave,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) .groups = w1_ds2780_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) static struct w1_family w1_ds2780_family = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) .fid = W1_FAMILY_DS2780,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) .fops = &w1_ds2780_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) module_w1_family(w1_ds2780_family);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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