/* * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor) * * Copyright (C) 2008, 2010 Pengutronix * * 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. * * TODO: SPI, use power-down mode for suspend?, interrupt handling? */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/slab.h> #define ADT7411_REG_STAT_1 0x00 #define ADT7411_STAT_1_INT_TEMP_HIGH BIT(0) #define ADT7411_STAT_1_INT_TEMP_LOW BIT(1) #define ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1 BIT(2) #define ADT7411_STAT_1_EXT_TEMP_LOW BIT(3) #define ADT7411_STAT_1_EXT_TEMP_FAULT BIT(4) #define ADT7411_STAT_1_AIN2 BIT(5) #define ADT7411_STAT_1_AIN3 BIT(6) #define ADT7411_STAT_1_AIN4 BIT(7) #define ADT7411_REG_STAT_2 0x01 #define ADT7411_STAT_2_AIN5 BIT(0) #define ADT7411_STAT_2_AIN6 BIT(1) #define ADT7411_STAT_2_AIN7 BIT(2) #define ADT7411_STAT_2_AIN8 BIT(3) #define ADT7411_STAT_2_VDD BIT(4) #define ADT7411_REG_INT_TEMP_VDD_LSB 0x03 #define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04 #define ADT7411_REG_VDD_MSB 0x06 #define ADT7411_REG_INT_TEMP_MSB 0x07 #define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08 #define ADT7411_REG_CFG1 0x18 #define ADT7411_CFG1_START_MONITOR BIT(0) #define ADT7411_CFG1_RESERVED_BIT1 BIT(1) #define ADT7411_CFG1_EXT_TDM BIT(2) #define ADT7411_CFG1_RESERVED_BIT3 BIT(3) #define ADT7411_REG_CFG2 0x19 #define ADT7411_CFG2_DISABLE_AVG BIT(5) #define ADT7411_REG_CFG3 0x1a #define ADT7411_CFG3_ADC_CLK_225 BIT(0) #define ADT7411_CFG3_RESERVED_BIT1 BIT(1) #define ADT7411_CFG3_RESERVED_BIT2 BIT(2) #define ADT7411_CFG3_RESERVED_BIT3 BIT(3) #define ADT7411_CFG3_REF_VDD BIT(4) #define ADT7411_REG_VDD_HIGH 0x23 #define ADT7411_REG_VDD_LOW 0x24 #define ADT7411_REG_TEMP_HIGH(nr) (0x25 + 2 * (nr)) #define ADT7411_REG_TEMP_LOW(nr) (0x26 + 2 * (nr)) #define ADT7411_REG_IN_HIGH(nr) ((nr) > 1 \ ? 0x2b + 2 * ((nr)-2) \ : 0x27) #define ADT7411_REG_IN_LOW(nr) ((nr) > 1 \ ? 0x2c + 2 * ((nr)-2) \ : 0x28) #define ADT7411_REG_DEVICE_ID 0x4d #define ADT7411_REG_MANUFACTURER_ID 0x4e #define ADT7411_DEVICE_ID 0x2 #define ADT7411_MANUFACTURER_ID 0x41 static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END }; static const u8 adt7411_in_alarm_reg[] = { ADT7411_REG_STAT_2, ADT7411_REG_STAT_1, ADT7411_REG_STAT_1, ADT7411_REG_STAT_1, ADT7411_REG_STAT_1, ADT7411_REG_STAT_2, ADT7411_REG_STAT_2, ADT7411_REG_STAT_2, ADT7411_REG_STAT_2, }; static const u8 adt7411_in_alarm_bits[] = { ADT7411_STAT_2_VDD, ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1, ADT7411_STAT_1_AIN2, ADT7411_STAT_1_AIN3, ADT7411_STAT_1_AIN4, ADT7411_STAT_2_AIN5, ADT7411_STAT_2_AIN6, ADT7411_STAT_2_AIN7, ADT7411_STAT_2_AIN8, }; struct adt7411_data { struct mutex device_lock; /* for "atomic" device accesses */ struct mutex update_lock; unsigned long next_update; long vref_cached; struct i2c_client *client; bool use_ext_temp; }; /* * When reading a register containing (up to 4) lsb, all associated * msb-registers get locked by the hardware. After _one_ of those msb is read, * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb * is protected here with a mutex, too. */ static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg, u8 msb_reg, u8 lsb_shift) { struct adt7411_data *data = i2c_get_clientdata(client); int val, tmp; mutex_lock(&data->device_lock); val = i2c_smbus_read_byte_data(client, lsb_reg); if (val < 0) goto exit_unlock; tmp = (val >> lsb_shift) & 3; val = i2c_smbus_read_byte_data(client, msb_reg); if (val >= 0) val = (val << 2) | tmp; exit_unlock: mutex_unlock(&data->device_lock); return val; } static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit, bool flag) { struct adt7411_data *data = i2c_get_clientdata(client); int ret, val; mutex_lock(&data->device_lock); ret = i2c_smbus_read_byte_data(client, reg); if (ret < 0) goto exit_unlock; if (flag) val = ret | bit; else val = ret & ~bit; ret = i2c_smbus_write_byte_data(client, reg, val); exit_unlock: mutex_unlock(&data->device_lock); return ret; } static ssize_t adt7411_show_bit(struct device *dev, struct device_attribute *attr, char *buf) { struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr); struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int ret = i2c_smbus_read_byte_data(client, attr2->index); return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr)); } static ssize_t adt7411_set_bit(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr); struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int ret; unsigned long flag; ret = kstrtoul(buf, 0, &flag); if (ret || flag > 1) return -EINVAL; ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag); /* force update */ mutex_lock(&data->update_lock); data->next_update = jiffies; mutex_unlock(&data->update_lock); return ret < 0 ? ret : count; } #define ADT7411_BIT_ATTR(__name, __reg, __bit) \ SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \ adt7411_set_bit, __bit, __reg) static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG); static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225); static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD); static struct attribute *adt7411_attrs[] = { &sensor_dev_attr_no_average.dev_attr.attr, &sensor_dev_attr_fast_sampling.dev_attr.attr, &sensor_dev_attr_adc_ref_vdd.dev_attr.attr, NULL }; ATTRIBUTE_GROUPS(adt7411); static int adt7411_read_in_alarm(struct device *dev, int channel, long *val) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int ret; ret = i2c_smbus_read_byte_data(client, adt7411_in_alarm_reg[channel]); if (ret < 0) return ret; *val = !!(ret & adt7411_in_alarm_bits[channel]); return 0; } static int adt7411_read_in_vdd(struct device *dev, u32 attr, long *val) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int ret; switch (attr) { case hwmon_in_input: ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB, ADT7411_REG_VDD_MSB, 2); if (ret < 0) return ret; *val = ret * 7000 / 1024; return 0; case hwmon_in_min: ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_LOW); if (ret < 0) return ret; *val = ret * 7000 / 256; return 0; case hwmon_in_max: ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_HIGH); if (ret < 0) return ret; *val = ret * 7000 / 256; return 0; case hwmon_in_alarm: return adt7411_read_in_alarm(dev, 0, val); default: return -EOPNOTSUPP; } } static int adt7411_update_vref(struct device *dev) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int val; if (time_after_eq(jiffies, data->next_update)) { val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3); if (val < 0) return val; if (val & ADT7411_CFG3_REF_VDD) { val = adt7411_read_in_vdd(dev, hwmon_in_input, &data->vref_cached); if (val < 0) return val; } else { data->vref_cached = 2250; } data->next_update = jiffies + HZ; } return 0; } static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel, long *val) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int ret; int reg, lsb_reg, lsb_shift; int nr = channel - 1; mutex_lock(&data->update_lock); ret = adt7411_update_vref(dev); if (ret < 0) goto exit_unlock; switch (attr) { case hwmon_in_input: lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2); lsb_shift = 2 * (nr & 0x03); ret = adt7411_read_10_bit(client, lsb_reg, ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift); if (ret < 0) goto exit_unlock; *val = ret * data->vref_cached / 1024; ret = 0; break; case hwmon_in_min: case hwmon_in_max: reg = (attr == hwmon_in_min) ? ADT7411_REG_IN_LOW(channel) : ADT7411_REG_IN_HIGH(channel); ret = i2c_smbus_read_byte_data(client, reg); if (ret < 0) goto exit_unlock; *val = ret * data->vref_cached / 256; ret = 0; break; case hwmon_in_alarm: ret = adt7411_read_in_alarm(dev, channel, val); break; default: ret = -EOPNOTSUPP; break; } exit_unlock: mutex_unlock(&data->update_lock); return ret; } static int adt7411_read_in(struct device *dev, u32 attr, int channel, long *val) { if (channel == 0) return adt7411_read_in_vdd(dev, attr, val); else return adt7411_read_in_chan(dev, attr, channel, val); } static int adt7411_read_temp_alarm(struct device *dev, u32 attr, int channel, long *val) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int ret, bit; ret = i2c_smbus_read_byte_data(client, ADT7411_REG_STAT_1); if (ret < 0) return ret; switch (attr) { case hwmon_temp_min_alarm: bit = channel ? ADT7411_STAT_1_EXT_TEMP_LOW : ADT7411_STAT_1_INT_TEMP_LOW; break; case hwmon_temp_max_alarm: bit = channel ? ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1 : ADT7411_STAT_1_INT_TEMP_HIGH; break; case hwmon_temp_fault: bit = ADT7411_STAT_1_EXT_TEMP_FAULT; break; default: return -EOPNOTSUPP; } *val = !!(ret & bit); return 0; } static int adt7411_read_temp(struct device *dev, u32 attr, int channel, long *val) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int ret, reg, regl, regh; switch (attr) { case hwmon_temp_input: regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB : ADT7411_REG_INT_TEMP_VDD_LSB; regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB : ADT7411_REG_INT_TEMP_MSB; ret = adt7411_read_10_bit(client, regl, regh, 0); if (ret < 0) return ret; ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */ *val = ret * 250; return 0; case hwmon_temp_min: case hwmon_temp_max: reg = (attr == hwmon_temp_min) ? ADT7411_REG_TEMP_LOW(channel) : ADT7411_REG_TEMP_HIGH(channel); ret = i2c_smbus_read_byte_data(client, reg); if (ret < 0) return ret; ret = ret & 0x80 ? ret - 0x100 : ret; /* 8 bit signed */ *val = ret * 1000; return 0; case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: case hwmon_temp_fault: return adt7411_read_temp_alarm(dev, attr, channel, val); default: return -EOPNOTSUPP; } } static int adt7411_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { switch (type) { case hwmon_in: return adt7411_read_in(dev, attr, channel, val); case hwmon_temp: return adt7411_read_temp(dev, attr, channel, val); default: return -EOPNOTSUPP; } } static int adt7411_write_in_vdd(struct device *dev, u32 attr, long val) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int reg; val = clamp_val(val, 0, 255 * 7000 / 256); val = DIV_ROUND_CLOSEST(val * 256, 7000); switch (attr) { case hwmon_in_min: reg = ADT7411_REG_VDD_LOW; break; case hwmon_in_max: reg = ADT7411_REG_VDD_HIGH; break; default: return -EOPNOTSUPP; } return i2c_smbus_write_byte_data(client, reg, val); } static int adt7411_write_in_chan(struct device *dev, u32 attr, int channel, long val) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int ret, reg; mutex_lock(&data->update_lock); ret = adt7411_update_vref(dev); if (ret < 0) goto exit_unlock; val = clamp_val(val, 0, 255 * data->vref_cached / 256); val = DIV_ROUND_CLOSEST(val * 256, data->vref_cached); switch (attr) { case hwmon_in_min: reg = ADT7411_REG_IN_LOW(channel); break; case hwmon_in_max: reg = ADT7411_REG_IN_HIGH(channel); break; default: ret = -EOPNOTSUPP; goto exit_unlock; } ret = i2c_smbus_write_byte_data(client, reg, val); exit_unlock: mutex_unlock(&data->update_lock); return ret; } static int adt7411_write_in(struct device *dev, u32 attr, int channel, long val) { if (channel == 0) return adt7411_write_in_vdd(dev, attr, val); else return adt7411_write_in_chan(dev, attr, channel, val); } static int adt7411_write_temp(struct device *dev, u32 attr, int channel, long val) { struct adt7411_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int reg; val = clamp_val(val, -128000, 127000); val = DIV_ROUND_CLOSEST(val, 1000); switch (attr) { case hwmon_temp_min: reg = ADT7411_REG_TEMP_LOW(channel); break; case hwmon_temp_max: reg = ADT7411_REG_TEMP_HIGH(channel); break; default: return -EOPNOTSUPP; } return i2c_smbus_write_byte_data(client, reg, val); } static int adt7411_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long val) { switch (type) { case hwmon_in: return adt7411_write_in(dev, attr, channel, val); case hwmon_temp: return adt7411_write_temp(dev, attr, channel, val); default: return -EOPNOTSUPP; } } static umode_t adt7411_is_visible(const void *_data, enum hwmon_sensor_types type, u32 attr, int channel) { const struct adt7411_data *data = _data; bool visible; switch (type) { case hwmon_in: visible = channel == 0 || channel >= 3 || !data->use_ext_temp; switch (attr) { case hwmon_in_input: case hwmon_in_alarm: return visible ? S_IRUGO : 0; case hwmon_in_min: case hwmon_in_max: return visible ? S_IRUGO | S_IWUSR : 0; } break; case hwmon_temp: visible = channel == 0 || data->use_ext_temp; switch (attr) { case hwmon_temp_input: case hwmon_temp_min_alarm: case hwmon_temp_max_alarm: case hwmon_temp_fault: return visible ? S_IRUGO : 0; case hwmon_temp_min: case hwmon_temp_max: return visible ? S_IRUGO | S_IWUSR : 0; } break; default: break; } return 0; } static int adt7411_detect(struct i2c_client *client, struct i2c_board_info *info) { int val; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -ENODEV; val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID); if (val < 0 || val != ADT7411_MANUFACTURER_ID) { dev_dbg(&client->dev, "Wrong manufacturer ID. Got %d, expected %d\n", val, ADT7411_MANUFACTURER_ID); return -ENODEV; } val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID); if (val < 0 || val != ADT7411_DEVICE_ID) { dev_dbg(&client->dev, "Wrong device ID. Got %d, expected %d\n", val, ADT7411_DEVICE_ID); return -ENODEV; } strlcpy(info->type, "adt7411", I2C_NAME_SIZE); return 0; } static int adt7411_init_device(struct adt7411_data *data) { int ret; u8 val; ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3); if (ret < 0) return ret; /* * We must only write zero to bit 1 and bit 2 and only one to bit 3 * according to the datasheet. */ val = ret; val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2); val |= ADT7411_CFG3_RESERVED_BIT3; ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val); if (ret < 0) return ret; ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1); if (ret < 0) return ret; data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM; /* * We must only write zero to bit 1 and only one to bit 3 according to * the datasheet. */ val = ret; val &= ~ADT7411_CFG1_RESERVED_BIT1; val |= ADT7411_CFG1_RESERVED_BIT3; /* enable monitoring */ val |= ADT7411_CFG1_START_MONITOR; return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val); } static const u32 adt7411_in_config[] = { HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM, 0 }; static const struct hwmon_channel_info adt7411_in = { .type = hwmon_in, .config = adt7411_in_config, }; static const u32 adt7411_temp_config[] = { HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM | HWMON_T_MAX | HWMON_T_MAX_ALARM, HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM | HWMON_T_MAX | HWMON_T_MAX_ALARM | HWMON_T_FAULT, 0 }; static const struct hwmon_channel_info adt7411_temp = { .type = hwmon_temp, .config = adt7411_temp_config, }; static const struct hwmon_channel_info *adt7411_info[] = { &adt7411_in, &adt7411_temp, NULL }; static const struct hwmon_ops adt7411_hwmon_ops = { .is_visible = adt7411_is_visible, .read = adt7411_read, .write = adt7411_write, }; static const struct hwmon_chip_info adt7411_chip_info = { .ops = &adt7411_hwmon_ops, .info = adt7411_info, }; static int adt7411_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct adt7411_data *data; struct device *hwmon_dev; int ret; data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; i2c_set_clientdata(client, data); data->client = client; mutex_init(&data->device_lock); mutex_init(&data->update_lock); ret = adt7411_init_device(data); if (ret < 0) return ret; /* force update on first occasion */ data->next_update = jiffies; hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, data, &adt7411_chip_info, adt7411_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct i2c_device_id adt7411_id[] = { { "adt7411", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, adt7411_id); static struct i2c_driver adt7411_driver = { .driver = { .name = "adt7411", }, .probe = adt7411_probe, .id_table = adt7411_id, .detect = adt7411_detect, .address_list = normal_i2c, .class = I2C_CLASS_HWMON, }; module_i2c_driver(adt7411_driver); MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and " "Wolfram Sang <w.sang@pengutronix.de>"); MODULE_DESCRIPTION("ADT7411 driver"); MODULE_LICENSE("GPL v2");