/* thmc50.c - Part of lm_sensors, Linux kernel modules for hardware monitoring Copyright (C) 2007 Krzysztof Helt <krzysztof.h1@wp.pl> Based on 2.4 driver by Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock <phil@netroedge.com> This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> MODULE_LICENSE("GPL"); /* Addresses to scan */ static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; /* Insmod parameters */ I2C_CLIENT_INSMOD_2(thmc50, adm1022); I2C_CLIENT_MODULE_PARM(adm1022_temp3, "List of adapter,address pairs " "to enable 3rd temperature (ADM1022 only)"); /* Many THMC50 constants specified below */ /* The THMC50 registers */ #define THMC50_REG_CONF 0x40 #define THMC50_REG_COMPANY_ID 0x3E #define THMC50_REG_DIE_CODE 0x3F #define THMC50_REG_ANALOG_OUT 0x19 const static u8 THMC50_REG_TEMP[] = { 0x27, 0x26, 0x20 }; const static u8 THMC50_REG_TEMP_MIN[] = { 0x3A, 0x38, 0x2C }; const static u8 THMC50_REG_TEMP_MAX[] = { 0x39, 0x37, 0x2B }; #define THMC50_REG_CONF_nFANOFF 0x20 /* Each client has this additional data */ struct thmc50_data { struct i2c_client client; struct class_device *class_dev; struct mutex update_lock; enum chips type; unsigned long last_updated; /* In jiffies */ char has_temp3; /* !=0 if it is ADM1022 in temp3 mode */ char valid; /* !=0 if following fields are valid */ /* Register values */ s8 temp_input[3]; s8 temp_max[3]; s8 temp_min[3]; u8 analog_out; }; static int thmc50_attach_adapter(struct i2c_adapter *adapter); static int thmc50_detach_client(struct i2c_client *client); static void thmc50_init_client(struct i2c_client *client); static struct thmc50_data *thmc50_update_device(struct device *dev); static struct i2c_driver thmc50_driver = { .driver = { .name = "thmc50", }, .attach_adapter = thmc50_attach_adapter, .detach_client = thmc50_detach_client, }; static ssize_t show_analog_out(struct device *dev, struct device_attribute *attr, char *buf) { struct thmc50_data *data = thmc50_update_device(dev); return sprintf(buf, "%d\n", data->analog_out); } static ssize_t set_analog_out(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct i2c_client *client = to_i2c_client(dev); struct thmc50_data *data = i2c_get_clientdata(client); int tmp = simple_strtoul(buf, NULL, 10); int config; mutex_lock(&data->update_lock); data->analog_out = SENSORS_LIMIT(tmp, 0, 255); i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, data->analog_out); config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); if (data->analog_out == 0) config &= ~THMC50_REG_CONF_nFANOFF; else config |= THMC50_REG_CONF_nFANOFF; i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); mutex_unlock(&data->update_lock); return count; } /* There is only one PWM mode = DC */ static ssize_t show_pwm_mode(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "0\n"); } /* Temperatures */ static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) { int nr = to_sensor_dev_attr(attr)->index; struct thmc50_data *data = thmc50_update_device(dev); return sprintf(buf, "%d\n", data->temp_input[nr] * 1000); } static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr, char *buf) { int nr = to_sensor_dev_attr(attr)->index; struct thmc50_data *data = thmc50_update_device(dev); return sprintf(buf, "%d\n", data->temp_min[nr] * 1000); } static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int nr = to_sensor_dev_attr(attr)->index; struct i2c_client *client = to_i2c_client(dev); struct thmc50_data *data = i2c_get_clientdata(client); int val = simple_strtol(buf, NULL, 10); mutex_lock(&data->update_lock); data->temp_min[nr] = SENSORS_LIMIT(val / 1000, -128, 127); i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MIN[nr], data->temp_min[nr]); mutex_unlock(&data->update_lock); return count; } static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr, char *buf) { int nr = to_sensor_dev_attr(attr)->index; struct thmc50_data *data = thmc50_update_device(dev); return sprintf(buf, "%d\n", data->temp_max[nr] * 1000); } static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int nr = to_sensor_dev_attr(attr)->index; struct i2c_client *client = to_i2c_client(dev); struct thmc50_data *data = i2c_get_clientdata(client); int val = simple_strtol(buf, NULL, 10); mutex_lock(&data->update_lock); data->temp_max[nr] = SENSORS_LIMIT(val / 1000, -128, 127); i2c_smbus_write_byte_data(client, THMC50_REG_TEMP_MAX[nr], data->temp_max[nr]); mutex_unlock(&data->update_lock); return count; } #define temp_reg(offset) \ static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, show_temp, \ NULL, offset - 1); \ static SENSOR_DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \ show_temp_min, set_temp_min, offset - 1); \ static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \ show_temp_max, set_temp_max, offset - 1); temp_reg(1); temp_reg(2); temp_reg(3); static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_analog_out, set_analog_out, 0); static SENSOR_DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL, 0); static struct attribute *thmc50_attributes[] = { &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, &sensor_dev_attr_temp2_min.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_pwm1.dev_attr.attr, &sensor_dev_attr_pwm1_mode.dev_attr.attr, NULL }; static const struct attribute_group thmc50_group = { .attrs = thmc50_attributes, }; /* for ADM1022 3rd temperature mode */ static struct attribute *adm1022_attributes[] = { &sensor_dev_attr_temp3_max.dev_attr.attr, &sensor_dev_attr_temp3_min.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, NULL }; static const struct attribute_group adm1022_group = { .attrs = adm1022_attributes, }; static int thmc50_detect(struct i2c_adapter *adapter, int address, int kind) { unsigned company; unsigned revision; unsigned config; struct i2c_client *client; struct thmc50_data *data; struct device *dev; int err = 0; const char *type_name = ""; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { pr_debug("thmc50: detect failed, " "smbus byte data not supported!\n"); goto exit; } /* OK. For now, we presume we have a valid client. We now create the client structure, even though we cannot fill it completely yet. But it allows us to access thmc50 registers. */ if (!(data = kzalloc(sizeof(struct thmc50_data), GFP_KERNEL))) { pr_debug("thmc50: detect failed, kzalloc failed!\n"); err = -ENOMEM; goto exit; } client = &data->client; i2c_set_clientdata(client, data); client->addr = address; client->adapter = adapter; client->driver = &thmc50_driver; dev = &client->dev; pr_debug("thmc50: Probing for THMC50 at 0x%2X on bus %d\n", client->addr, i2c_adapter_id(client->adapter)); /* Now, we do the remaining detection. */ company = i2c_smbus_read_byte_data(client, THMC50_REG_COMPANY_ID); revision = i2c_smbus_read_byte_data(client, THMC50_REG_DIE_CODE); config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); if (kind == 0) kind = thmc50; else if (kind < 0) { err = -ENODEV; if (revision >= 0xc0 && ((config & 0x10) == 0)) { if (company == 0x49) { kind = thmc50; err = 0; } else if (company == 0x41) { kind = adm1022; err = 0; } } } if (err == -ENODEV) { pr_debug("thmc50: Detection of THMC50/ADM1022 failed\n"); goto exit_free; } pr_debug("thmc50: Detected %s (version %x, revision %x)\n", type_name, (revision >> 4) - 0xc, revision & 0xf); data->type = kind; if (kind == thmc50) type_name = "thmc50"; else if (kind == adm1022) { int id = i2c_adapter_id(client->adapter); int i; type_name = "adm1022"; data->has_temp3 = (config >> 7) & 1; /* config MSB */ for (i = 0; i + 1 < adm1022_temp3_num; i += 2) if (adm1022_temp3[i] == id && adm1022_temp3[i + 1] == address) { /* enable 2nd remote temp */ data->has_temp3 = 1; break; } } /* Fill in the remaining client fields & put it into the global list */ strlcpy(client->name, type_name, I2C_NAME_SIZE); mutex_init(&data->update_lock); /* Tell the I2C layer a new client has arrived */ if ((err = i2c_attach_client(client))) goto exit_free; thmc50_init_client(client); /* Register sysfs hooks */ if ((err = sysfs_create_group(&client->dev.kobj, &thmc50_group))) goto exit_detach; /* Register ADM1022 sysfs hooks */ if (data->type == adm1022) if ((err = sysfs_create_group(&client->dev.kobj, &adm1022_group))) goto exit_remove_sysfs_thmc50; /* Register a new directory entry with module sensors */ data->class_dev = hwmon_device_register(&client->dev); if (IS_ERR(data->class_dev)) { err = PTR_ERR(data->class_dev); goto exit_remove_sysfs; } return 0; exit_remove_sysfs: if (data->type == adm1022) sysfs_remove_group(&client->dev.kobj, &adm1022_group); exit_remove_sysfs_thmc50: sysfs_remove_group(&client->dev.kobj, &thmc50_group); exit_detach: i2c_detach_client(client); exit_free: kfree(data); exit: return err; } static int thmc50_attach_adapter(struct i2c_adapter *adapter) { if (!(adapter->class & I2C_CLASS_HWMON)) return 0; return i2c_probe(adapter, &addr_data, thmc50_detect); } static int thmc50_detach_client(struct i2c_client *client) { struct thmc50_data *data = i2c_get_clientdata(client); int err; hwmon_device_unregister(data->class_dev); sysfs_remove_group(&client->dev.kobj, &thmc50_group); if (data->type == adm1022) sysfs_remove_group(&client->dev.kobj, &adm1022_group); if ((err = i2c_detach_client(client))) return err; kfree(data); return 0; } static void thmc50_init_client(struct i2c_client *client) { struct thmc50_data *data = i2c_get_clientdata(client); int config; data->analog_out = i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT); /* set up to at least 1 */ if (data->analog_out == 0) { data->analog_out = 1; i2c_smbus_write_byte_data(client, THMC50_REG_ANALOG_OUT, data->analog_out); } config = i2c_smbus_read_byte_data(client, THMC50_REG_CONF); config |= 0x1; /* start the chip if it is in standby mode */ if (data->has_temp3) config |= 0x80; /* enable 2nd remote temp */ i2c_smbus_write_byte_data(client, THMC50_REG_CONF, config); } static struct thmc50_data *thmc50_update_device(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); struct thmc50_data *data = i2c_get_clientdata(client); int timeout = HZ / 5 + (data->type == thmc50 ? HZ : 0); mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + timeout) || !data->valid) { int temps = data->has_temp3 ? 3 : 2; int i; for (i = 0; i < temps; i++) { data->temp_input[i] = i2c_smbus_read_byte_data(client, THMC50_REG_TEMP[i]); data->temp_max[i] = i2c_smbus_read_byte_data(client, THMC50_REG_TEMP_MAX[i]); data->temp_min[i] = i2c_smbus_read_byte_data(client, THMC50_REG_TEMP_MIN[i]); } data->analog_out = i2c_smbus_read_byte_data(client, THMC50_REG_ANALOG_OUT); data->last_updated = jiffies; data->valid = 1; } mutex_unlock(&data->update_lock); return data; } static int __init sm_thmc50_init(void) { return i2c_add_driver(&thmc50_driver); } static void __exit sm_thmc50_exit(void) { i2c_del_driver(&thmc50_driver); } MODULE_AUTHOR("Krzysztof Helt <krzysztof.h1@wp.pl>"); MODULE_DESCRIPTION("THMC50 driver"); module_init(sm_thmc50_init); module_exit(sm_thmc50_exit);