linux/drivers/hwmon/ltc4245.c
<<
>>
Prefs
   1/*
   2 * Driver for Linear Technology LTC4245 I2C Multiple Supply Hot Swap Controller
   3 *
   4 * Copyright (C) 2008 Ira W. Snyder <iws@ovro.caltech.edu>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; version 2 of the License.
   9 *
  10 * This driver is based on the ds1621 and ina209 drivers.
  11 *
  12 * Datasheet:
  13 * http://www.linear.com/pc/downloadDocument.do?navId=H0,C1,C1003,C1006,C1140,P19392,D13517
  14 */
  15
  16#include <linux/kernel.h>
  17#include <linux/module.h>
  18#include <linux/init.h>
  19#include <linux/err.h>
  20#include <linux/slab.h>
  21#include <linux/i2c.h>
  22#include <linux/hwmon.h>
  23#include <linux/hwmon-sysfs.h>
  24#include <linux/jiffies.h>
  25#include <linux/i2c/ltc4245.h>
  26
  27/* Here are names of the chip's registers (a.k.a. commands) */
  28enum ltc4245_cmd {
  29        LTC4245_STATUS                  = 0x00, /* readonly */
  30        LTC4245_ALERT                   = 0x01,
  31        LTC4245_CONTROL                 = 0x02,
  32        LTC4245_ON                      = 0x03,
  33        LTC4245_FAULT1                  = 0x04,
  34        LTC4245_FAULT2                  = 0x05,
  35        LTC4245_GPIO                    = 0x06,
  36        LTC4245_ADCADR                  = 0x07,
  37
  38        LTC4245_12VIN                   = 0x10,
  39        LTC4245_12VSENSE                = 0x11,
  40        LTC4245_12VOUT                  = 0x12,
  41        LTC4245_5VIN                    = 0x13,
  42        LTC4245_5VSENSE                 = 0x14,
  43        LTC4245_5VOUT                   = 0x15,
  44        LTC4245_3VIN                    = 0x16,
  45        LTC4245_3VSENSE                 = 0x17,
  46        LTC4245_3VOUT                   = 0x18,
  47        LTC4245_VEEIN                   = 0x19,
  48        LTC4245_VEESENSE                = 0x1a,
  49        LTC4245_VEEOUT                  = 0x1b,
  50        LTC4245_GPIOADC                 = 0x1c,
  51};
  52
  53struct ltc4245_data {
  54        struct device *hwmon_dev;
  55
  56        struct mutex update_lock;
  57        bool valid;
  58        unsigned long last_updated; /* in jiffies */
  59
  60        /* Control registers */
  61        u8 cregs[0x08];
  62
  63        /* Voltage registers */
  64        u8 vregs[0x0d];
  65
  66        /* GPIO ADC registers */
  67        bool use_extra_gpios;
  68        int gpios[3];
  69};
  70
  71/*
  72 * Update the readings from the GPIO pins. If the driver has been configured to
  73 * sample all GPIO's as analog voltages, a round-robin sampling method is used.
  74 * Otherwise, only the configured GPIO pin is sampled.
  75 *
  76 * LOCKING: must hold data->update_lock
  77 */
  78static void ltc4245_update_gpios(struct device *dev)
  79{
  80        struct i2c_client *client = to_i2c_client(dev);
  81        struct ltc4245_data *data = i2c_get_clientdata(client);
  82        u8 gpio_curr, gpio_next, gpio_reg;
  83        int i;
  84
  85        /* no extra gpio support, we're basically done */
  86        if (!data->use_extra_gpios) {
  87                data->gpios[0] = data->vregs[LTC4245_GPIOADC - 0x10];
  88                return;
  89        }
  90
  91        /*
  92         * If the last reading was too long ago, then we mark all old GPIO
  93         * readings as stale by setting them to -EAGAIN
  94         */
  95        if (time_after(jiffies, data->last_updated + 5 * HZ)) {
  96                dev_dbg(&client->dev, "Marking GPIOs invalid\n");
  97                for (i = 0; i < ARRAY_SIZE(data->gpios); i++)
  98                        data->gpios[i] = -EAGAIN;
  99        }
 100
 101        /*
 102         * Get the current GPIO pin
 103         *
 104         * The datasheet calls these GPIO[1-3], but we'll calculate the zero
 105         * based array index instead, and call them GPIO[0-2]. This is much
 106         * easier to think about.
 107         */
 108        gpio_curr = (data->cregs[LTC4245_GPIO] & 0xc0) >> 6;
 109        if (gpio_curr > 0)
 110                gpio_curr -= 1;
 111
 112        /* Read the GPIO voltage from the GPIOADC register */
 113        data->gpios[gpio_curr] = data->vregs[LTC4245_GPIOADC - 0x10];
 114
 115        /* Find the next GPIO pin to read */
 116        gpio_next = (gpio_curr + 1) % ARRAY_SIZE(data->gpios);
 117
 118        /*
 119         * Calculate the correct setting for the GPIO register so it will
 120         * sample the next GPIO pin
 121         */
 122        gpio_reg = (data->cregs[LTC4245_GPIO] & 0x3f) | ((gpio_next + 1) << 6);
 123
 124        /* Update the GPIO register */
 125        i2c_smbus_write_byte_data(client, LTC4245_GPIO, gpio_reg);
 126
 127        /* Update saved data */
 128        data->cregs[LTC4245_GPIO] = gpio_reg;
 129}
 130
 131static struct ltc4245_data *ltc4245_update_device(struct device *dev)
 132{
 133        struct i2c_client *client = to_i2c_client(dev);
 134        struct ltc4245_data *data = i2c_get_clientdata(client);
 135        s32 val;
 136        int i;
 137
 138        mutex_lock(&data->update_lock);
 139
 140        if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
 141
 142                dev_dbg(&client->dev, "Starting ltc4245 update\n");
 143
 144                /* Read control registers -- 0x00 to 0x07 */
 145                for (i = 0; i < ARRAY_SIZE(data->cregs); i++) {
 146                        val = i2c_smbus_read_byte_data(client, i);
 147                        if (unlikely(val < 0))
 148                                data->cregs[i] = 0;
 149                        else
 150                                data->cregs[i] = val;
 151                }
 152
 153                /* Read voltage registers -- 0x10 to 0x1c */
 154                for (i = 0; i < ARRAY_SIZE(data->vregs); i++) {
 155                        val = i2c_smbus_read_byte_data(client, i+0x10);
 156                        if (unlikely(val < 0))
 157                                data->vregs[i] = 0;
 158                        else
 159                                data->vregs[i] = val;
 160                }
 161
 162                /* Update GPIO readings */
 163                ltc4245_update_gpios(dev);
 164
 165                data->last_updated = jiffies;
 166                data->valid = 1;
 167        }
 168
 169        mutex_unlock(&data->update_lock);
 170
 171        return data;
 172}
 173
 174/* Return the voltage from the given register in millivolts */
 175static int ltc4245_get_voltage(struct device *dev, u8 reg)
 176{
 177        struct ltc4245_data *data = ltc4245_update_device(dev);
 178        const u8 regval = data->vregs[reg - 0x10];
 179        u32 voltage = 0;
 180
 181        switch (reg) {
 182        case LTC4245_12VIN:
 183        case LTC4245_12VOUT:
 184                voltage = regval * 55;
 185                break;
 186        case LTC4245_5VIN:
 187        case LTC4245_5VOUT:
 188                voltage = regval * 22;
 189                break;
 190        case LTC4245_3VIN:
 191        case LTC4245_3VOUT:
 192                voltage = regval * 15;
 193                break;
 194        case LTC4245_VEEIN:
 195        case LTC4245_VEEOUT:
 196                voltage = regval * -55;
 197                break;
 198        case LTC4245_GPIOADC:
 199                voltage = regval * 10;
 200                break;
 201        default:
 202                /* If we get here, the developer messed up */
 203                WARN_ON_ONCE(1);
 204                break;
 205        }
 206
 207        return voltage;
 208}
 209
 210/* Return the current in the given sense register in milliAmperes */
 211static unsigned int ltc4245_get_current(struct device *dev, u8 reg)
 212{
 213        struct ltc4245_data *data = ltc4245_update_device(dev);
 214        const u8 regval = data->vregs[reg - 0x10];
 215        unsigned int voltage;
 216        unsigned int curr;
 217
 218        /*
 219         * The strange looking conversions that follow are fixed-point
 220         * math, since we cannot do floating point in the kernel.
 221         *
 222         * Step 1: convert sense register to microVolts
 223         * Step 2: convert voltage to milliAmperes
 224         *
 225         * If you play around with the V=IR equation, you come up with
 226         * the following: X uV / Y mOhm == Z mA
 227         *
 228         * With the resistors that are fractions of a milliOhm, we multiply
 229         * the voltage and resistance by 10, to shift the decimal point.
 230         * Now we can use the normal division operator again.
 231         */
 232
 233        switch (reg) {
 234        case LTC4245_12VSENSE:
 235                voltage = regval * 250; /* voltage in uV */
 236                curr = voltage / 50; /* sense resistor 50 mOhm */
 237                break;
 238        case LTC4245_5VSENSE:
 239                voltage = regval * 125; /* voltage in uV */
 240                curr = (voltage * 10) / 35; /* sense resistor 3.5 mOhm */
 241                break;
 242        case LTC4245_3VSENSE:
 243                voltage = regval * 125; /* voltage in uV */
 244                curr = (voltage * 10) / 25; /* sense resistor 2.5 mOhm */
 245                break;
 246        case LTC4245_VEESENSE:
 247                voltage = regval * 250; /* voltage in uV */
 248                curr = voltage / 100; /* sense resistor 100 mOhm */
 249                break;
 250        default:
 251                /* If we get here, the developer messed up */
 252                WARN_ON_ONCE(1);
 253                curr = 0;
 254                break;
 255        }
 256
 257        return curr;
 258}
 259
 260static ssize_t ltc4245_show_voltage(struct device *dev,
 261                                    struct device_attribute *da,
 262                                    char *buf)
 263{
 264        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 265        const int voltage = ltc4245_get_voltage(dev, attr->index);
 266
 267        return snprintf(buf, PAGE_SIZE, "%d\n", voltage);
 268}
 269
 270static ssize_t ltc4245_show_current(struct device *dev,
 271                                    struct device_attribute *da,
 272                                    char *buf)
 273{
 274        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 275        const unsigned int curr = ltc4245_get_current(dev, attr->index);
 276
 277        return snprintf(buf, PAGE_SIZE, "%u\n", curr);
 278}
 279
 280static ssize_t ltc4245_show_power(struct device *dev,
 281                                  struct device_attribute *da,
 282                                  char *buf)
 283{
 284        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 285        const unsigned int curr = ltc4245_get_current(dev, attr->index);
 286        const int output_voltage = ltc4245_get_voltage(dev, attr->index+1);
 287
 288        /* current in mA * voltage in mV == power in uW */
 289        const unsigned int power = abs(output_voltage * curr);
 290
 291        return snprintf(buf, PAGE_SIZE, "%u\n", power);
 292}
 293
 294static ssize_t ltc4245_show_alarm(struct device *dev,
 295                                          struct device_attribute *da,
 296                                          char *buf)
 297{
 298        struct sensor_device_attribute_2 *attr = to_sensor_dev_attr_2(da);
 299        struct ltc4245_data *data = ltc4245_update_device(dev);
 300        const u8 reg = data->cregs[attr->index];
 301        const u32 mask = attr->nr;
 302
 303        return snprintf(buf, PAGE_SIZE, "%u\n", (reg & mask) ? 1 : 0);
 304}
 305
 306static ssize_t ltc4245_show_gpio(struct device *dev,
 307                                 struct device_attribute *da,
 308                                 char *buf)
 309{
 310        struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 311        struct ltc4245_data *data = ltc4245_update_device(dev);
 312        int val = data->gpios[attr->index];
 313
 314        /* handle stale GPIO's */
 315        if (val < 0)
 316                return val;
 317
 318        /* Convert to millivolts and print */
 319        return snprintf(buf, PAGE_SIZE, "%u\n", val * 10);
 320}
 321
 322/* Construct a sensor_device_attribute structure for each register */
 323
 324/* Input voltages */
 325static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ltc4245_show_voltage, NULL,
 326                          LTC4245_12VIN);
 327static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ltc4245_show_voltage, NULL,
 328                          LTC4245_5VIN);
 329static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, ltc4245_show_voltage, NULL,
 330                          LTC4245_3VIN);
 331static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, ltc4245_show_voltage, NULL,
 332                          LTC4245_VEEIN);
 333
 334/* Input undervoltage alarms */
 335static SENSOR_DEVICE_ATTR_2(in1_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 336                            1 << 0, LTC4245_FAULT1);
 337static SENSOR_DEVICE_ATTR_2(in2_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 338                            1 << 1, LTC4245_FAULT1);
 339static SENSOR_DEVICE_ATTR_2(in3_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 340                            1 << 2, LTC4245_FAULT1);
 341static SENSOR_DEVICE_ATTR_2(in4_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 342                            1 << 3, LTC4245_FAULT1);
 343
 344/* Currents (via sense resistor) */
 345static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ltc4245_show_current, NULL,
 346                          LTC4245_12VSENSE);
 347static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, ltc4245_show_current, NULL,
 348                          LTC4245_5VSENSE);
 349static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO, ltc4245_show_current, NULL,
 350                          LTC4245_3VSENSE);
 351static SENSOR_DEVICE_ATTR(curr4_input, S_IRUGO, ltc4245_show_current, NULL,
 352                          LTC4245_VEESENSE);
 353
 354/* Overcurrent alarms */
 355static SENSOR_DEVICE_ATTR_2(curr1_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 356                            1 << 4, LTC4245_FAULT1);
 357static SENSOR_DEVICE_ATTR_2(curr2_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 358                            1 << 5, LTC4245_FAULT1);
 359static SENSOR_DEVICE_ATTR_2(curr3_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 360                            1 << 6, LTC4245_FAULT1);
 361static SENSOR_DEVICE_ATTR_2(curr4_max_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 362                            1 << 7, LTC4245_FAULT1);
 363
 364/* Output voltages */
 365static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, ltc4245_show_voltage, NULL,
 366                          LTC4245_12VOUT);
 367static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, ltc4245_show_voltage, NULL,
 368                          LTC4245_5VOUT);
 369static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, ltc4245_show_voltage, NULL,
 370                          LTC4245_3VOUT);
 371static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, ltc4245_show_voltage, NULL,
 372                          LTC4245_VEEOUT);
 373
 374/* Power Bad alarms */
 375static SENSOR_DEVICE_ATTR_2(in5_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 376                            1 << 0, LTC4245_FAULT2);
 377static SENSOR_DEVICE_ATTR_2(in6_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 378                            1 << 1, LTC4245_FAULT2);
 379static SENSOR_DEVICE_ATTR_2(in7_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 380                            1 << 2, LTC4245_FAULT2);
 381static SENSOR_DEVICE_ATTR_2(in8_min_alarm, S_IRUGO, ltc4245_show_alarm, NULL,
 382                            1 << 3, LTC4245_FAULT2);
 383
 384/* GPIO voltages */
 385static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, ltc4245_show_gpio, NULL, 0);
 386static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, ltc4245_show_gpio, NULL, 1);
 387static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, ltc4245_show_gpio, NULL, 2);
 388
 389/* Power Consumption (virtual) */
 390static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ltc4245_show_power, NULL,
 391                          LTC4245_12VSENSE);
 392static SENSOR_DEVICE_ATTR(power2_input, S_IRUGO, ltc4245_show_power, NULL,
 393                          LTC4245_5VSENSE);
 394static SENSOR_DEVICE_ATTR(power3_input, S_IRUGO, ltc4245_show_power, NULL,
 395                          LTC4245_3VSENSE);
 396static SENSOR_DEVICE_ATTR(power4_input, S_IRUGO, ltc4245_show_power, NULL,
 397                          LTC4245_VEESENSE);
 398
 399/*
 400 * Finally, construct an array of pointers to members of the above objects,
 401 * as required for sysfs_create_group()
 402 */
 403static struct attribute *ltc4245_std_attributes[] = {
 404        &sensor_dev_attr_in1_input.dev_attr.attr,
 405        &sensor_dev_attr_in2_input.dev_attr.attr,
 406        &sensor_dev_attr_in3_input.dev_attr.attr,
 407        &sensor_dev_attr_in4_input.dev_attr.attr,
 408
 409        &sensor_dev_attr_in1_min_alarm.dev_attr.attr,
 410        &sensor_dev_attr_in2_min_alarm.dev_attr.attr,
 411        &sensor_dev_attr_in3_min_alarm.dev_attr.attr,
 412        &sensor_dev_attr_in4_min_alarm.dev_attr.attr,
 413
 414        &sensor_dev_attr_curr1_input.dev_attr.attr,
 415        &sensor_dev_attr_curr2_input.dev_attr.attr,
 416        &sensor_dev_attr_curr3_input.dev_attr.attr,
 417        &sensor_dev_attr_curr4_input.dev_attr.attr,
 418
 419        &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
 420        &sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
 421        &sensor_dev_attr_curr3_max_alarm.dev_attr.attr,
 422        &sensor_dev_attr_curr4_max_alarm.dev_attr.attr,
 423
 424        &sensor_dev_attr_in5_input.dev_attr.attr,
 425        &sensor_dev_attr_in6_input.dev_attr.attr,
 426        &sensor_dev_attr_in7_input.dev_attr.attr,
 427        &sensor_dev_attr_in8_input.dev_attr.attr,
 428
 429        &sensor_dev_attr_in5_min_alarm.dev_attr.attr,
 430        &sensor_dev_attr_in6_min_alarm.dev_attr.attr,
 431        &sensor_dev_attr_in7_min_alarm.dev_attr.attr,
 432        &sensor_dev_attr_in8_min_alarm.dev_attr.attr,
 433
 434        &sensor_dev_attr_in9_input.dev_attr.attr,
 435
 436        &sensor_dev_attr_power1_input.dev_attr.attr,
 437        &sensor_dev_attr_power2_input.dev_attr.attr,
 438        &sensor_dev_attr_power3_input.dev_attr.attr,
 439        &sensor_dev_attr_power4_input.dev_attr.attr,
 440
 441        NULL,
 442};
 443
 444static struct attribute *ltc4245_gpio_attributes[] = {
 445        &sensor_dev_attr_in10_input.dev_attr.attr,
 446        &sensor_dev_attr_in11_input.dev_attr.attr,
 447        NULL,
 448};
 449
 450static const struct attribute_group ltc4245_std_group = {
 451        .attrs = ltc4245_std_attributes,
 452};
 453
 454static const struct attribute_group ltc4245_gpio_group = {
 455        .attrs = ltc4245_gpio_attributes,
 456};
 457
 458static int ltc4245_sysfs_create_groups(struct i2c_client *client)
 459{
 460        struct ltc4245_data *data = i2c_get_clientdata(client);
 461        struct device *dev = &client->dev;
 462        int ret;
 463
 464        /* register the standard sysfs attributes */
 465        ret = sysfs_create_group(&dev->kobj, &ltc4245_std_group);
 466        if (ret) {
 467                dev_err(dev, "unable to register standard attributes\n");
 468                return ret;
 469        }
 470
 471        /* if we're using the extra gpio support, register it's attributes */
 472        if (data->use_extra_gpios) {
 473                ret = sysfs_create_group(&dev->kobj, &ltc4245_gpio_group);
 474                if (ret) {
 475                        dev_err(dev, "unable to register gpio attributes\n");
 476                        sysfs_remove_group(&dev->kobj, &ltc4245_std_group);
 477                        return ret;
 478                }
 479        }
 480
 481        return 0;
 482}
 483
 484static void ltc4245_sysfs_remove_groups(struct i2c_client *client)
 485{
 486        struct ltc4245_data *data = i2c_get_clientdata(client);
 487        struct device *dev = &client->dev;
 488
 489        if (data->use_extra_gpios)
 490                sysfs_remove_group(&dev->kobj, &ltc4245_gpio_group);
 491
 492        sysfs_remove_group(&dev->kobj, &ltc4245_std_group);
 493}
 494
 495static bool ltc4245_use_extra_gpios(struct i2c_client *client)
 496{
 497        struct ltc4245_platform_data *pdata = dev_get_platdata(&client->dev);
 498#ifdef CONFIG_OF
 499        struct device_node *np = client->dev.of_node;
 500#endif
 501
 502        /* prefer platform data */
 503        if (pdata)
 504                return pdata->use_extra_gpios;
 505
 506#ifdef CONFIG_OF
 507        /* fallback on OF */
 508        if (of_find_property(np, "ltc4245,use-extra-gpios", NULL))
 509                return true;
 510#endif
 511
 512        return false;
 513}
 514
 515static int ltc4245_probe(struct i2c_client *client,
 516                         const struct i2c_device_id *id)
 517{
 518        struct i2c_adapter *adapter = client->adapter;
 519        struct ltc4245_data *data;
 520        int ret;
 521
 522        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 523                return -ENODEV;
 524
 525        data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
 526        if (!data)
 527                return -ENOMEM;
 528
 529        i2c_set_clientdata(client, data);
 530        mutex_init(&data->update_lock);
 531        data->use_extra_gpios = ltc4245_use_extra_gpios(client);
 532
 533        /* Initialize the LTC4245 chip */
 534        i2c_smbus_write_byte_data(client, LTC4245_FAULT1, 0x00);
 535        i2c_smbus_write_byte_data(client, LTC4245_FAULT2, 0x00);
 536
 537        /* Register sysfs hooks */
 538        ret = ltc4245_sysfs_create_groups(client);
 539        if (ret)
 540                return ret;
 541
 542        data->hwmon_dev = hwmon_device_register(&client->dev);
 543        if (IS_ERR(data->hwmon_dev)) {
 544                ret = PTR_ERR(data->hwmon_dev);
 545                goto out_hwmon_device_register;
 546        }
 547
 548        return 0;
 549
 550out_hwmon_device_register:
 551        ltc4245_sysfs_remove_groups(client);
 552        return ret;
 553}
 554
 555static int ltc4245_remove(struct i2c_client *client)
 556{
 557        struct ltc4245_data *data = i2c_get_clientdata(client);
 558
 559        hwmon_device_unregister(data->hwmon_dev);
 560        ltc4245_sysfs_remove_groups(client);
 561
 562        return 0;
 563}
 564
 565static const struct i2c_device_id ltc4245_id[] = {
 566        { "ltc4245", 0 },
 567        { }
 568};
 569MODULE_DEVICE_TABLE(i2c, ltc4245_id);
 570
 571/* This is the driver that will be inserted */
 572static struct i2c_driver ltc4245_driver = {
 573        .driver = {
 574                .name   = "ltc4245",
 575        },
 576        .probe          = ltc4245_probe,
 577        .remove         = ltc4245_remove,
 578        .id_table       = ltc4245_id,
 579};
 580
 581module_i2c_driver(ltc4245_driver);
 582
 583MODULE_AUTHOR("Ira W. Snyder <iws@ovro.caltech.edu>");
 584MODULE_DESCRIPTION("LTC4245 driver");
 585MODULE_LICENSE("GPL");
 586
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.