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159 lines
3.5 KiB
159 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* 1-Wire implementation for the ds2780 chip |
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* |
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* Copyright (C) 2010 Indesign, LLC |
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* |
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* Author: Clifton Barnes <[email protected]> |
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* |
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* Based on w1-ds2760 driver |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/types.h> |
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#include <linux/platform_device.h> |
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#include <linux/mutex.h> |
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#include <linux/idr.h> |
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#include <linux/w1.h> |
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#include "w1_ds2780.h" |
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#define W1_FAMILY_DS2780 0x32 |
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static int w1_ds2780_do_io(struct device *dev, char *buf, int addr, |
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size_t count, int io) |
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{ |
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev); |
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if (addr > DS2780_DATA_SIZE || addr < 0) |
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return 0; |
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count = min_t(int, count, DS2780_DATA_SIZE - addr); |
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if (w1_reset_select_slave(sl) == 0) { |
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if (io) { |
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w1_write_8(sl->master, W1_DS2780_WRITE_DATA); |
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w1_write_8(sl->master, addr); |
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w1_write_block(sl->master, buf, count); |
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} else { |
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w1_write_8(sl->master, W1_DS2780_READ_DATA); |
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w1_write_8(sl->master, addr); |
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count = w1_read_block(sl->master, buf, count); |
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} |
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} |
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return count; |
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} |
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int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count, |
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int io) |
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{ |
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev); |
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int ret; |
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if (!dev) |
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return -ENODEV; |
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mutex_lock(&sl->master->bus_mutex); |
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ret = w1_ds2780_do_io(dev, buf, addr, count, io); |
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mutex_unlock(&sl->master->bus_mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL(w1_ds2780_io); |
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int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd) |
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{ |
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struct w1_slave *sl = container_of(dev, struct w1_slave, dev); |
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if (!dev) |
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return -EINVAL; |
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mutex_lock(&sl->master->bus_mutex); |
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if (w1_reset_select_slave(sl) == 0) { |
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w1_write_8(sl->master, cmd); |
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w1_write_8(sl->master, addr); |
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} |
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mutex_unlock(&sl->master->bus_mutex); |
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return 0; |
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} |
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EXPORT_SYMBOL(w1_ds2780_eeprom_cmd); |
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static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, char *buf, |
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loff_t off, size_t count) |
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{ |
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struct device *dev = container_of(kobj, struct device, kobj); |
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return w1_ds2780_io(dev, buf, off, count, 0); |
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} |
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static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE); |
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static struct bin_attribute *w1_ds2780_bin_attrs[] = { |
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&bin_attr_w1_slave, |
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NULL, |
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}; |
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static const struct attribute_group w1_ds2780_group = { |
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.bin_attrs = w1_ds2780_bin_attrs, |
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}; |
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static const struct attribute_group *w1_ds2780_groups[] = { |
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&w1_ds2780_group, |
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NULL, |
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}; |
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static int w1_ds2780_add_slave(struct w1_slave *sl) |
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{ |
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int ret; |
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struct platform_device *pdev; |
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pdev = platform_device_alloc("ds2780-battery", PLATFORM_DEVID_AUTO); |
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if (!pdev) |
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return -ENOMEM; |
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pdev->dev.parent = &sl->dev; |
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ret = platform_device_add(pdev); |
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if (ret) |
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goto pdev_add_failed; |
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dev_set_drvdata(&sl->dev, pdev); |
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return 0; |
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pdev_add_failed: |
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platform_device_put(pdev); |
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return ret; |
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} |
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static void w1_ds2780_remove_slave(struct w1_slave *sl) |
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{ |
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struct platform_device *pdev = dev_get_drvdata(&sl->dev); |
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platform_device_unregister(pdev); |
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} |
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static const struct w1_family_ops w1_ds2780_fops = { |
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.add_slave = w1_ds2780_add_slave, |
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.remove_slave = w1_ds2780_remove_slave, |
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.groups = w1_ds2780_groups, |
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}; |
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static struct w1_family w1_ds2780_family = { |
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.fid = W1_FAMILY_DS2780, |
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.fops = &w1_ds2780_fops, |
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}; |
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module_w1_family(w1_ds2780_family); |
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MODULE_AUTHOR("Clifton Barnes <[email protected]>"); |
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MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));
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