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256 lines
6.6 KiB
256 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* ds620.c - Support for temperature sensor and thermostat DS620 |
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* |
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* Copyright (C) 2010, 2011 Roland Stigge <[email protected]> |
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* |
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* based on ds1621.c by Christian W. Zuckschwerdt <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <linux/jiffies.h> |
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#include <linux/i2c.h> |
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#include <linux/hwmon.h> |
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#include <linux/hwmon-sysfs.h> |
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#include <linux/err.h> |
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#include <linux/mutex.h> |
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#include <linux/sysfs.h> |
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#include <linux/platform_data/ds620.h> |
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/* |
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* Many DS620 constants specified below |
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* 15 14 13 12 11 10 09 08 |
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* |Done|NVB |THF |TLF |R1 |R0 |AUTOC|1SHOT| |
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* |
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* 07 06 05 04 03 02 01 00 |
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* |PO2 |PO1 |A2 |A1 |A0 | | | | |
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*/ |
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#define DS620_REG_CONFIG_DONE 0x8000 |
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#define DS620_REG_CONFIG_NVB 0x4000 |
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#define DS620_REG_CONFIG_THF 0x2000 |
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#define DS620_REG_CONFIG_TLF 0x1000 |
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#define DS620_REG_CONFIG_R1 0x0800 |
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#define DS620_REG_CONFIG_R0 0x0400 |
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#define DS620_REG_CONFIG_AUTOC 0x0200 |
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#define DS620_REG_CONFIG_1SHOT 0x0100 |
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#define DS620_REG_CONFIG_PO2 0x0080 |
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#define DS620_REG_CONFIG_PO1 0x0040 |
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#define DS620_REG_CONFIG_A2 0x0020 |
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#define DS620_REG_CONFIG_A1 0x0010 |
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#define DS620_REG_CONFIG_A0 0x0008 |
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/* The DS620 registers */ |
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static const u8 DS620_REG_TEMP[3] = { |
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0xAA, /* input, word, RO */ |
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0xA2, /* min, word, RW */ |
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0xA0, /* max, word, RW */ |
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}; |
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#define DS620_REG_CONF 0xAC /* word, RW */ |
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#define DS620_COM_START 0x51 /* no data */ |
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#define DS620_COM_STOP 0x22 /* no data */ |
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/* Each client has this additional data */ |
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struct ds620_data { |
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struct i2c_client *client; |
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struct mutex update_lock; |
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bool valid; /* true if following fields are valid */ |
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unsigned long last_updated; /* In jiffies */ |
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s16 temp[3]; /* Register values, word */ |
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}; |
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static void ds620_init_client(struct i2c_client *client) |
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{ |
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struct ds620_platform_data *ds620_info = dev_get_platdata(&client->dev); |
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u16 conf, new_conf; |
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new_conf = conf = |
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i2c_smbus_read_word_swapped(client, DS620_REG_CONF); |
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/* switch to continuous conversion mode */ |
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new_conf &= ~DS620_REG_CONFIG_1SHOT; |
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/* already high at power-on, but don't trust the BIOS! */ |
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new_conf |= DS620_REG_CONFIG_PO2; |
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/* thermostat mode according to platform data */ |
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if (ds620_info && ds620_info->pomode == 1) |
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new_conf &= ~DS620_REG_CONFIG_PO1; /* PO_LOW */ |
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else if (ds620_info && ds620_info->pomode == 2) |
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new_conf |= DS620_REG_CONFIG_PO1; /* PO_HIGH */ |
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else |
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new_conf &= ~DS620_REG_CONFIG_PO2; /* always low */ |
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/* with highest precision */ |
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new_conf |= DS620_REG_CONFIG_R1 | DS620_REG_CONFIG_R0; |
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if (conf != new_conf) |
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i2c_smbus_write_word_swapped(client, DS620_REG_CONF, new_conf); |
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/* start conversion */ |
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i2c_smbus_write_byte(client, DS620_COM_START); |
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} |
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static struct ds620_data *ds620_update_client(struct device *dev) |
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{ |
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struct ds620_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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struct ds620_data *ret = data; |
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mutex_lock(&data->update_lock); |
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if (time_after(jiffies, data->last_updated + HZ + HZ / 2) |
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|| !data->valid) { |
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int i; |
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int res; |
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dev_dbg(&client->dev, "Starting ds620 update\n"); |
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for (i = 0; i < ARRAY_SIZE(data->temp); i++) { |
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res = i2c_smbus_read_word_swapped(client, |
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DS620_REG_TEMP[i]); |
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if (res < 0) { |
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ret = ERR_PTR(res); |
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goto abort; |
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} |
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data->temp[i] = res; |
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} |
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data->last_updated = jiffies; |
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data->valid = true; |
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} |
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abort: |
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mutex_unlock(&data->update_lock); |
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return ret; |
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} |
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static ssize_t temp_show(struct device *dev, struct device_attribute *da, |
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char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct ds620_data *data = ds620_update_client(dev); |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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return sprintf(buf, "%d\n", ((data->temp[attr->index] / 8) * 625) / 10); |
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} |
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static ssize_t temp_store(struct device *dev, struct device_attribute *da, |
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const char *buf, size_t count) |
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{ |
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int res; |
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long val; |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct ds620_data *data = dev_get_drvdata(dev); |
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struct i2c_client *client = data->client; |
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res = kstrtol(buf, 10, &val); |
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if (res) |
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return res; |
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val = (clamp_val(val, -128000, 128000) * 10 / 625) * 8; |
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mutex_lock(&data->update_lock); |
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data->temp[attr->index] = val; |
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i2c_smbus_write_word_swapped(client, DS620_REG_TEMP[attr->index], |
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data->temp[attr->index]); |
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mutex_unlock(&data->update_lock); |
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return count; |
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} |
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static ssize_t alarm_show(struct device *dev, struct device_attribute *da, |
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char *buf) |
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{ |
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struct sensor_device_attribute *attr = to_sensor_dev_attr(da); |
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struct ds620_data *data = ds620_update_client(dev); |
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struct i2c_client *client; |
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u16 conf, new_conf; |
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int res; |
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if (IS_ERR(data)) |
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return PTR_ERR(data); |
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client = data->client; |
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/* reset alarms if necessary */ |
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res = i2c_smbus_read_word_swapped(client, DS620_REG_CONF); |
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if (res < 0) |
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return res; |
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new_conf = conf = res; |
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new_conf &= ~attr->index; |
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if (conf != new_conf) { |
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res = i2c_smbus_write_word_swapped(client, DS620_REG_CONF, |
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new_conf); |
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if (res < 0) |
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return res; |
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} |
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return sprintf(buf, "%d\n", !!(conf & attr->index)); |
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} |
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static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); |
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static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, 1); |
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static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, 2); |
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static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, alarm, DS620_REG_CONFIG_TLF); |
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static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, DS620_REG_CONFIG_THF); |
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static struct attribute *ds620_attrs[] = { |
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&sensor_dev_attr_temp1_input.dev_attr.attr, |
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&sensor_dev_attr_temp1_min.dev_attr.attr, |
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&sensor_dev_attr_temp1_max.dev_attr.attr, |
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr, |
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(ds620); |
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static int ds620_probe(struct i2c_client *client) |
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{ |
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struct device *dev = &client->dev; |
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struct device *hwmon_dev; |
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struct ds620_data *data; |
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data = devm_kzalloc(dev, sizeof(struct ds620_data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->client = client; |
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mutex_init(&data->update_lock); |
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/* Initialize the DS620 chip */ |
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ds620_init_client(client); |
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hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
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data, ds620_groups); |
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return PTR_ERR_OR_ZERO(hwmon_dev); |
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} |
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static const struct i2c_device_id ds620_id[] = { |
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{"ds620", 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, ds620_id); |
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/* This is the driver that will be inserted */ |
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static struct i2c_driver ds620_driver = { |
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.class = I2C_CLASS_HWMON, |
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.driver = { |
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.name = "ds620", |
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}, |
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.probe_new = ds620_probe, |
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.id_table = ds620_id, |
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}; |
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module_i2c_driver(ds620_driver); |
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MODULE_AUTHOR("Roland Stigge <[email protected]>"); |
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MODULE_DESCRIPTION("DS620 driver"); |
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MODULE_LICENSE("GPL");
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