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authorJean Delvare <khali@linux-fr.org>2008-07-16 13:30:14 -0400
committerJean Delvare <khali@mahadeva.delvare>2008-07-16 13:30:14 -0400
commit8c8bacc883610b672d3f08dc6ebf1f17e495f5b9 (patch)
treefe74da507723e7998923663ca8ecdb9a51693e63 /drivers/hwmon
parenta189dd62d328db7bf8ba68de6a948fdbc93dca25 (diff)
hwmon: (lm80) Convert to a new-style i2c driver
The new-style lm80 driver implements the optional detect() callback to cover the use cases of the legacy driver. Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/lm80.c94
1 files changed, 43 insertions, 51 deletions
diff --git a/drivers/hwmon/lm80.c b/drivers/hwmon/lm80.c
index 26c91c9d4769..bcffc1899403 100644
--- a/drivers/hwmon/lm80.c
+++ b/drivers/hwmon/lm80.c
@@ -108,7 +108,6 @@ static inline long TEMP_FROM_REG(u16 temp)
108 */ 108 */
109 109
110struct lm80_data { 110struct lm80_data {
111 struct i2c_client client;
112 struct device *hwmon_dev; 111 struct device *hwmon_dev;
113 struct mutex update_lock; 112 struct mutex update_lock;
114 char valid; /* !=0 if following fields are valid */ 113 char valid; /* !=0 if following fields are valid */
@@ -132,10 +131,12 @@ struct lm80_data {
132 * Functions declaration 131 * Functions declaration
133 */ 132 */
134 133
135static int lm80_attach_adapter(struct i2c_adapter *adapter); 134static int lm80_probe(struct i2c_client *client,
136static int lm80_detect(struct i2c_adapter *adapter, int address, int kind); 135 const struct i2c_device_id *id);
136static int lm80_detect(struct i2c_client *client, int kind,
137 struct i2c_board_info *info);
137static void lm80_init_client(struct i2c_client *client); 138static void lm80_init_client(struct i2c_client *client);
138static int lm80_detach_client(struct i2c_client *client); 139static int lm80_remove(struct i2c_client *client);
139static struct lm80_data *lm80_update_device(struct device *dev); 140static struct lm80_data *lm80_update_device(struct device *dev);
140static int lm80_read_value(struct i2c_client *client, u8 reg); 141static int lm80_read_value(struct i2c_client *client, u8 reg);
141static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value); 142static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
@@ -144,12 +145,22 @@ static int lm80_write_value(struct i2c_client *client, u8 reg, u8 value);
144 * Driver data (common to all clients) 145 * Driver data (common to all clients)
145 */ 146 */
146 147
148static const struct i2c_device_id lm80_id[] = {
149 { "lm80", lm80 },
150 { }
151};
152MODULE_DEVICE_TABLE(i2c, lm80_id);
153
147static struct i2c_driver lm80_driver = { 154static struct i2c_driver lm80_driver = {
155 .class = I2C_CLASS_HWMON,
148 .driver = { 156 .driver = {
149 .name = "lm80", 157 .name = "lm80",
150 }, 158 },
151 .attach_adapter = lm80_attach_adapter, 159 .probe = lm80_probe,
152 .detach_client = lm80_detach_client, 160 .remove = lm80_remove,
161 .id_table = lm80_id,
162 .detect = lm80_detect,
163 .address_data = &addr_data,
153}; 164};
154 165
155/* 166/*
@@ -383,13 +394,6 @@ static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
383 * Real code 394 * Real code
384 */ 395 */
385 396
386static int lm80_attach_adapter(struct i2c_adapter *adapter)
387{
388 if (!(adapter->class & I2C_CLASS_HWMON))
389 return 0;
390 return i2c_probe(adapter, &addr_data, lm80_detect);
391}
392
393static struct attribute *lm80_attributes[] = { 397static struct attribute *lm80_attributes[] = {
394 &sensor_dev_attr_in0_min.dev_attr.attr, 398 &sensor_dev_attr_in0_min.dev_attr.attr,
395 &sensor_dev_attr_in1_min.dev_attr.attr, 399 &sensor_dev_attr_in1_min.dev_attr.attr,
@@ -442,53 +446,46 @@ static const struct attribute_group lm80_group = {
442 .attrs = lm80_attributes, 446 .attrs = lm80_attributes,
443}; 447};
444 448
445static int lm80_detect(struct i2c_adapter *adapter, int address, int kind) 449/* Return 0 if detection is successful, -ENODEV otherwise */
450static int lm80_detect(struct i2c_client *client, int kind,
451 struct i2c_board_info *info)
446{ 452{
453 struct i2c_adapter *adapter = client->adapter;
447 int i, cur; 454 int i, cur;
448 struct i2c_client *client;
449 struct lm80_data *data;
450 int err = 0;
451 const char *name;
452 455
453 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 456 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
454 goto exit; 457 return -ENODEV;
455
456 /* OK. For now, we presume we have a valid client. We now create the
457 client structure, even though we cannot fill it completely yet.
458 But it allows us to access lm80_{read,write}_value. */
459 if (!(data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL))) {
460 err = -ENOMEM;
461 goto exit;
462 }
463
464 client = &data->client;
465 i2c_set_clientdata(client, data);
466 client->addr = address;
467 client->adapter = adapter;
468 client->driver = &lm80_driver;
469 458
470 /* Now, we do the remaining detection. It is lousy. */ 459 /* Now, we do the remaining detection. It is lousy. */
471 if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0) 460 if (lm80_read_value(client, LM80_REG_ALARM2) & 0xc0)
472 goto error_free; 461 return -ENODEV;
473 for (i = 0x2a; i <= 0x3d; i++) { 462 for (i = 0x2a; i <= 0x3d; i++) {
474 cur = i2c_smbus_read_byte_data(client, i); 463 cur = i2c_smbus_read_byte_data(client, i);
475 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur) 464 if ((i2c_smbus_read_byte_data(client, i + 0x40) != cur)
476 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur) 465 || (i2c_smbus_read_byte_data(client, i + 0x80) != cur)
477 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur)) 466 || (i2c_smbus_read_byte_data(client, i + 0xc0) != cur))
478 goto error_free; 467 return -ENODEV;
479 } 468 }
480 469
481 /* Determine the chip type - only one kind supported! */ 470 strlcpy(info->type, "lm80", I2C_NAME_SIZE);
482 kind = lm80;
483 name = "lm80";
484 471
485 /* Fill in the remaining client fields */ 472 return 0;
486 strlcpy(client->name, name, I2C_NAME_SIZE); 473}
487 mutex_init(&data->update_lock);
488 474
489 /* Tell the I2C layer a new client has arrived */ 475static int lm80_probe(struct i2c_client *client,
490 if ((err = i2c_attach_client(client))) 476 const struct i2c_device_id *id)
491 goto error_free; 477{
478 struct lm80_data *data;
479 int err;
480
481 data = kzalloc(sizeof(struct lm80_data), GFP_KERNEL);
482 if (!data) {
483 err = -ENOMEM;
484 goto exit;
485 }
486
487 i2c_set_clientdata(client, data);
488 mutex_init(&data->update_lock);
492 489
493 /* Initialize the LM80 chip */ 490 /* Initialize the LM80 chip */
494 lm80_init_client(client); 491 lm80_init_client(client);
@@ -499,7 +496,7 @@ static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
499 496
500 /* Register sysfs hooks */ 497 /* Register sysfs hooks */
501 if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group))) 498 if ((err = sysfs_create_group(&client->dev.kobj, &lm80_group)))
502 goto error_detach; 499 goto error_free;
503 500
504 data->hwmon_dev = hwmon_device_register(&client->dev); 501 data->hwmon_dev = hwmon_device_register(&client->dev);
505 if (IS_ERR(data->hwmon_dev)) { 502 if (IS_ERR(data->hwmon_dev)) {
@@ -511,23 +508,18 @@ static int lm80_detect(struct i2c_adapter *adapter, int address, int kind)
511 508
512error_remove: 509error_remove:
513 sysfs_remove_group(&client->dev.kobj, &lm80_group); 510 sysfs_remove_group(&client->dev.kobj, &lm80_group);
514error_detach:
515 i2c_detach_client(client);
516error_free: 511error_free:
517 kfree(data); 512 kfree(data);
518exit: 513exit:
519 return err; 514 return err;
520} 515}
521 516
522static int lm80_detach_client(struct i2c_client *client) 517static int lm80_remove(struct i2c_client *client)
523{ 518{
524 struct lm80_data *data = i2c_get_clientdata(client); 519 struct lm80_data *data = i2c_get_clientdata(client);
525 int err;
526 520
527 hwmon_device_unregister(data->hwmon_dev); 521 hwmon_device_unregister(data->hwmon_dev);
528 sysfs_remove_group(&client->dev.kobj, &lm80_group); 522 sysfs_remove_group(&client->dev.kobj, &lm80_group);
529 if ((err = i2c_detach_client(client)))
530 return err;
531 523
532 kfree(data); 524 kfree(data);
533 return 0; 525 return 0;