Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 1 | /* Texas Instruments TMP102 SMBus temperature sensor driver |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 2 | * |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 3 | * Copyright (C) 2010 Steven King <sfking@fdwdc.com> |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 20 | #include <linux/module.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/slab.h> |
| 23 | #include <linux/i2c.h> |
| 24 | #include <linux/hwmon.h> |
| 25 | #include <linux/hwmon-sysfs.h> |
| 26 | #include <linux/err.h> |
| 27 | #include <linux/mutex.h> |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 28 | #include <linux/device.h> |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 29 | |
| 30 | #define DRIVER_NAME "tmp102" |
| 31 | |
| 32 | #define TMP102_TEMP_REG 0x00 |
| 33 | #define TMP102_CONF_REG 0x01 |
| 34 | /* note: these bit definitions are byte swapped */ |
| 35 | #define TMP102_CONF_SD 0x0100 |
| 36 | #define TMP102_CONF_TM 0x0200 |
| 37 | #define TMP102_CONF_POL 0x0400 |
| 38 | #define TMP102_CONF_F0 0x0800 |
| 39 | #define TMP102_CONF_F1 0x1000 |
| 40 | #define TMP102_CONF_R0 0x2000 |
| 41 | #define TMP102_CONF_R1 0x4000 |
| 42 | #define TMP102_CONF_OS 0x8000 |
| 43 | #define TMP102_CONF_EM 0x0010 |
| 44 | #define TMP102_CONF_AL 0x0020 |
| 45 | #define TMP102_CONF_CR0 0x0040 |
| 46 | #define TMP102_CONF_CR1 0x0080 |
| 47 | #define TMP102_TLOW_REG 0x02 |
| 48 | #define TMP102_THIGH_REG 0x03 |
| 49 | |
| 50 | struct tmp102 { |
| 51 | struct device *hwmon_dev; |
| 52 | struct mutex lock; |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 53 | u16 config_orig; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 54 | unsigned long last_update; |
| 55 | int temp[3]; |
| 56 | }; |
| 57 | |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 58 | /* convert left adjusted 13-bit TMP102 register value to milliCelsius */ |
| 59 | static inline int tmp102_reg_to_mC(s16 val) |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 60 | { |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 61 | return ((val & ~0x01) * 1000) / 128; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 62 | } |
| 63 | |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 64 | /* convert milliCelsius to left adjusted 13-bit TMP102 register value */ |
| 65 | static inline u16 tmp102_mC_to_reg(int val) |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 66 | { |
| 67 | return (val * 128) / 1000; |
| 68 | } |
| 69 | |
| 70 | static const u8 tmp102_reg[] = { |
| 71 | TMP102_TEMP_REG, |
| 72 | TMP102_TLOW_REG, |
| 73 | TMP102_THIGH_REG, |
| 74 | }; |
| 75 | |
| 76 | static struct tmp102 *tmp102_update_device(struct i2c_client *client) |
| 77 | { |
| 78 | struct tmp102 *tmp102 = i2c_get_clientdata(client); |
| 79 | |
| 80 | mutex_lock(&tmp102->lock); |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 81 | if (time_after(jiffies, tmp102->last_update + HZ / 3)) { |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 82 | int i; |
| 83 | for (i = 0; i < ARRAY_SIZE(tmp102->temp); ++i) { |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 84 | int status = i2c_smbus_read_word_swapped(client, |
| 85 | tmp102_reg[i]); |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 86 | if (status > -1) |
| 87 | tmp102->temp[i] = tmp102_reg_to_mC(status); |
| 88 | } |
| 89 | tmp102->last_update = jiffies; |
| 90 | } |
| 91 | mutex_unlock(&tmp102->lock); |
| 92 | return tmp102; |
| 93 | } |
| 94 | |
| 95 | static ssize_t tmp102_show_temp(struct device *dev, |
| 96 | struct device_attribute *attr, |
| 97 | char *buf) |
| 98 | { |
| 99 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); |
| 100 | struct tmp102 *tmp102 = tmp102_update_device(to_i2c_client(dev)); |
| 101 | |
| 102 | return sprintf(buf, "%d\n", tmp102->temp[sda->index]); |
| 103 | } |
| 104 | |
| 105 | static ssize_t tmp102_set_temp(struct device *dev, |
| 106 | struct device_attribute *attr, |
| 107 | const char *buf, size_t count) |
| 108 | { |
| 109 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); |
| 110 | struct i2c_client *client = to_i2c_client(dev); |
| 111 | struct tmp102 *tmp102 = i2c_get_clientdata(client); |
| 112 | long val; |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 113 | int status; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 114 | |
Frans Meulenbroeks | 179c4fd | 2012-01-04 20:58:52 +0100 | [diff] [blame] | 115 | if (kstrtol(buf, 10, &val) < 0) |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 116 | return -EINVAL; |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 117 | val = SENSORS_LIMIT(val, -256000, 255000); |
| 118 | |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 119 | mutex_lock(&tmp102->lock); |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 120 | tmp102->temp[sda->index] = val; |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 121 | status = i2c_smbus_write_word_swapped(client, tmp102_reg[sda->index], |
| 122 | tmp102_mC_to_reg(val)); |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 123 | mutex_unlock(&tmp102->lock); |
| 124 | return status ? : count; |
| 125 | } |
| 126 | |
| 127 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, tmp102_show_temp, NULL , 0); |
| 128 | |
| 129 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, tmp102_show_temp, |
| 130 | tmp102_set_temp, 1); |
| 131 | |
| 132 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, tmp102_show_temp, |
| 133 | tmp102_set_temp, 2); |
| 134 | |
| 135 | static struct attribute *tmp102_attributes[] = { |
| 136 | &sensor_dev_attr_temp1_input.dev_attr.attr, |
| 137 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, |
| 138 | &sensor_dev_attr_temp1_max.dev_attr.attr, |
| 139 | NULL |
| 140 | }; |
| 141 | |
| 142 | static const struct attribute_group tmp102_attr_group = { |
| 143 | .attrs = tmp102_attributes, |
| 144 | }; |
| 145 | |
| 146 | #define TMP102_CONFIG (TMP102_CONF_TM | TMP102_CONF_EM | TMP102_CONF_CR1) |
| 147 | #define TMP102_CONFIG_RD_ONLY (TMP102_CONF_R0 | TMP102_CONF_R1 | TMP102_CONF_AL) |
| 148 | |
| 149 | static int __devinit tmp102_probe(struct i2c_client *client, |
| 150 | const struct i2c_device_id *id) |
| 151 | { |
| 152 | struct tmp102 *tmp102; |
| 153 | int status; |
| 154 | |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 155 | if (!i2c_check_functionality(client->adapter, |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 156 | I2C_FUNC_SMBUS_WORD_DATA)) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 157 | dev_err(&client->dev, "adapter doesn't support SMBus word " |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 158 | "transactions\n"); |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 159 | return -ENODEV; |
| 160 | } |
| 161 | |
| 162 | tmp102 = kzalloc(sizeof(*tmp102), GFP_KERNEL); |
| 163 | if (!tmp102) { |
| 164 | dev_dbg(&client->dev, "kzalloc failed\n"); |
| 165 | return -ENOMEM; |
| 166 | } |
| 167 | i2c_set_clientdata(client, tmp102); |
| 168 | |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 169 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 170 | if (status < 0) { |
| 171 | dev_err(&client->dev, "error reading config register\n"); |
| 172 | goto fail_free; |
| 173 | } |
| 174 | tmp102->config_orig = status; |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 175 | status = i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
| 176 | TMP102_CONFIG); |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 177 | if (status < 0) { |
| 178 | dev_err(&client->dev, "error writing config register\n"); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 179 | goto fail_restore_config; |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 180 | } |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 181 | status = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 182 | if (status < 0) { |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 183 | dev_err(&client->dev, "error reading config register\n"); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 184 | goto fail_restore_config; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 185 | } |
| 186 | status &= ~TMP102_CONFIG_RD_ONLY; |
| 187 | if (status != TMP102_CONFIG) { |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 188 | dev_err(&client->dev, "config settings did not stick\n"); |
| 189 | status = -ENODEV; |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 190 | goto fail_restore_config; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 191 | } |
| 192 | tmp102->last_update = jiffies - HZ; |
| 193 | mutex_init(&tmp102->lock); |
| 194 | |
| 195 | status = sysfs_create_group(&client->dev.kobj, &tmp102_attr_group); |
| 196 | if (status) { |
| 197 | dev_dbg(&client->dev, "could not create sysfs files\n"); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 198 | goto fail_restore_config; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 199 | } |
| 200 | tmp102->hwmon_dev = hwmon_device_register(&client->dev); |
| 201 | if (IS_ERR(tmp102->hwmon_dev)) { |
| 202 | dev_dbg(&client->dev, "unable to register hwmon device\n"); |
| 203 | status = PTR_ERR(tmp102->hwmon_dev); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 204 | goto fail_remove_sysfs; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 205 | } |
| 206 | |
| 207 | dev_info(&client->dev, "initialized\n"); |
| 208 | |
| 209 | return 0; |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 210 | |
| 211 | fail_remove_sysfs: |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 212 | sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 213 | fail_restore_config: |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 214 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
| 215 | tmp102->config_orig); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 216 | fail_free: |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 217 | kfree(tmp102); |
| 218 | |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 219 | return status; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 220 | } |
| 221 | |
| 222 | static int __devexit tmp102_remove(struct i2c_client *client) |
| 223 | { |
| 224 | struct tmp102 *tmp102 = i2c_get_clientdata(client); |
| 225 | |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 226 | hwmon_device_unregister(tmp102->hwmon_dev); |
| 227 | sysfs_remove_group(&client->dev.kobj, &tmp102_attr_group); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 228 | |
| 229 | /* Stop monitoring if device was stopped originally */ |
| 230 | if (tmp102->config_orig & TMP102_CONF_SD) { |
| 231 | int config; |
| 232 | |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 233 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 234 | if (config >= 0) |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 235 | i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, |
| 236 | config | TMP102_CONF_SD); |
Jean Delvare | 38806bd | 2010-05-27 19:58:59 +0200 | [diff] [blame] | 237 | } |
| 238 | |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 239 | kfree(tmp102); |
| 240 | |
| 241 | return 0; |
| 242 | } |
| 243 | |
| 244 | #ifdef CONFIG_PM |
| 245 | static int tmp102_suspend(struct device *dev) |
| 246 | { |
| 247 | struct i2c_client *client = to_i2c_client(dev); |
Jean Delvare | 8d4dee9 | 2010-05-27 19:58:58 +0200 | [diff] [blame] | 248 | int config; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 249 | |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 250 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
Jean Delvare | 8d4dee9 | 2010-05-27 19:58:58 +0200 | [diff] [blame] | 251 | if (config < 0) |
| 252 | return config; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 253 | |
Jean Delvare | 8d4dee9 | 2010-05-27 19:58:58 +0200 | [diff] [blame] | 254 | config |= TMP102_CONF_SD; |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 255 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 256 | } |
| 257 | |
| 258 | static int tmp102_resume(struct device *dev) |
| 259 | { |
| 260 | struct i2c_client *client = to_i2c_client(dev); |
Jean Delvare | 8d4dee9 | 2010-05-27 19:58:58 +0200 | [diff] [blame] | 261 | int config; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 262 | |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 263 | config = i2c_smbus_read_word_swapped(client, TMP102_CONF_REG); |
Jean Delvare | 8d4dee9 | 2010-05-27 19:58:58 +0200 | [diff] [blame] | 264 | if (config < 0) |
| 265 | return config; |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 266 | |
Jean Delvare | 8d4dee9 | 2010-05-27 19:58:58 +0200 | [diff] [blame] | 267 | config &= ~TMP102_CONF_SD; |
Jean Delvare | 90f4102 | 2011-11-04 12:00:47 +0100 | [diff] [blame] | 268 | return i2c_smbus_write_word_swapped(client, TMP102_CONF_REG, config); |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 269 | } |
| 270 | |
| 271 | static const struct dev_pm_ops tmp102_dev_pm_ops = { |
| 272 | .suspend = tmp102_suspend, |
| 273 | .resume = tmp102_resume, |
| 274 | }; |
| 275 | |
| 276 | #define TMP102_DEV_PM_OPS (&tmp102_dev_pm_ops) |
| 277 | #else |
| 278 | #define TMP102_DEV_PM_OPS NULL |
| 279 | #endif /* CONFIG_PM */ |
| 280 | |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 281 | static const struct i2c_device_id tmp102_id[] = { |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 282 | { "tmp102", 0 }, |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 283 | { } |
| 284 | }; |
Jean Delvare | cff37c9 | 2010-05-27 19:58:57 +0200 | [diff] [blame] | 285 | MODULE_DEVICE_TABLE(i2c, tmp102_id); |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 286 | |
| 287 | static struct i2c_driver tmp102_driver = { |
| 288 | .driver.name = DRIVER_NAME, |
| 289 | .driver.pm = TMP102_DEV_PM_OPS, |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 290 | .probe = tmp102_probe, |
| 291 | .remove = __devexit_p(tmp102_remove), |
| 292 | .id_table = tmp102_id, |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 293 | }; |
| 294 | |
| 295 | static int __init tmp102_init(void) |
| 296 | { |
| 297 | return i2c_add_driver(&tmp102_driver); |
| 298 | } |
| 299 | module_init(tmp102_init); |
| 300 | |
| 301 | static void __exit tmp102_exit(void) |
| 302 | { |
| 303 | i2c_del_driver(&tmp102_driver); |
| 304 | } |
| 305 | module_exit(tmp102_exit); |
| 306 | |
Steven King | beb1b6b | 2010-05-27 19:58:56 +0200 | [diff] [blame] | 307 | MODULE_AUTHOR("Steven King <sfking@fdwdc.com>"); |
| 308 | MODULE_DESCRIPTION("Texas Instruments TMP102 temperature sensor driver"); |
| 309 | MODULE_LICENSE("GPL"); |