diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/w1/slaves/w1_ds2780.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/w1/slaves/w1_ds2780.c b/drivers/w1/slaves/w1_ds2780.c new file mode 100644 index 000000000..c281fe5ed --- /dev/null +++ b/drivers/w1/slaves/w1_ds2780.c @@ -0,0 +1,159 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * 1-Wire implementation for the ds2780 chip + * + * Copyright (C) 2010 Indesign, LLC + * + * Author: Clifton Barnes <cabarnes@indesign-llc.com> + * + * Based on w1-ds2760 driver + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/types.h> +#include <linux/platform_device.h> +#include <linux/mutex.h> +#include <linux/idr.h> + +#include <linux/w1.h> + +#include "w1_ds2780.h" + +#define W1_FAMILY_DS2780 0x32 + +static int w1_ds2780_do_io(struct device *dev, char *buf, int addr, + size_t count, int io) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + + if (addr > DS2780_DATA_SIZE || addr < 0) + return 0; + + count = min_t(int, count, DS2780_DATA_SIZE - addr); + + if (w1_reset_select_slave(sl) == 0) { + if (io) { + w1_write_8(sl->master, W1_DS2780_WRITE_DATA); + w1_write_8(sl->master, addr); + w1_write_block(sl->master, buf, count); + } else { + w1_write_8(sl->master, W1_DS2780_READ_DATA); + w1_write_8(sl->master, addr); + count = w1_read_block(sl->master, buf, count); + } + } + + return count; +} + +int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count, + int io) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + int ret; + + if (!dev) + return -ENODEV; + + mutex_lock(&sl->master->bus_mutex); + + ret = w1_ds2780_do_io(dev, buf, addr, count, io); + + mutex_unlock(&sl->master->bus_mutex); + + return ret; +} +EXPORT_SYMBOL(w1_ds2780_io); + +int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd) +{ + struct w1_slave *sl = container_of(dev, struct w1_slave, dev); + + if (!dev) + return -EINVAL; + + mutex_lock(&sl->master->bus_mutex); + + if (w1_reset_select_slave(sl) == 0) { + w1_write_8(sl->master, cmd); + w1_write_8(sl->master, addr); + } + + mutex_unlock(&sl->master->bus_mutex); + return 0; +} +EXPORT_SYMBOL(w1_ds2780_eeprom_cmd); + +static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, char *buf, + loff_t off, size_t count) +{ + struct device *dev = container_of(kobj, struct device, kobj); + return w1_ds2780_io(dev, buf, off, count, 0); +} + +static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE); + +static struct bin_attribute *w1_ds2780_bin_attrs[] = { + &bin_attr_w1_slave, + NULL, +}; + +static const struct attribute_group w1_ds2780_group = { + .bin_attrs = w1_ds2780_bin_attrs, +}; + +static const struct attribute_group *w1_ds2780_groups[] = { + &w1_ds2780_group, + NULL, +}; + +static int w1_ds2780_add_slave(struct w1_slave *sl) +{ + int ret; + struct platform_device *pdev; + + pdev = platform_device_alloc("ds2780-battery", PLATFORM_DEVID_AUTO); + if (!pdev) + return -ENOMEM; + pdev->dev.parent = &sl->dev; + + ret = platform_device_add(pdev); + if (ret) + goto pdev_add_failed; + + dev_set_drvdata(&sl->dev, pdev); + + return 0; + +pdev_add_failed: + platform_device_put(pdev); + + return ret; +} + +static void w1_ds2780_remove_slave(struct w1_slave *sl) +{ + struct platform_device *pdev = dev_get_drvdata(&sl->dev); + + platform_device_unregister(pdev); +} + +static const struct w1_family_ops w1_ds2780_fops = { + .add_slave = w1_ds2780_add_slave, + .remove_slave = w1_ds2780_remove_slave, + .groups = w1_ds2780_groups, +}; + +static struct w1_family w1_ds2780_family = { + .fid = W1_FAMILY_DS2780, + .fops = &w1_ds2780_fops, +}; +module_w1_family(w1_ds2780_family); + +MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>"); +MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780)); |