* Devices. That chip is similar to the LM90, with a few differences
* that are not handled by this driver. Complete datasheet can be
* obtained from Analog's website at:
- * http://products.analog.com/products/info.asp?product=ADM1032
+ * http://www.analog.com/en/prod/0,2877,ADM1032,00.html
* Among others, it has a higher accuracy than the LM90, much like the
* LM86 does.
*
* register values are decoded differently) it is ignored by this
* driver. Complete datasheet can be obtained from Analog's website
* at:
- * http://products.analog.com/products/info.asp?product=ADT7461
+ * http://www.analog.com/en/prod/0,2877,ADT7461,00.html
*
* Since the LM90 was the first chipset supported by this driver, most
* comments will refer to this chipset, but are actually general and
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon.h>
#include <linux/err.h>
+#include <linux/mutex.h>
/*
* Addresses to scan
* Address is fully defined internally and cannot be changed except for
* MAX6659.
- * LM86, LM89, LM90, LM99, ADM1032, MAX6657 and MAX6658 have address 0x4c.
- * LM89-1, and LM99-1 have address 0x4d.
+ * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, MAX6657 and MAX6658
+ * have address 0x4c.
+ * ADM1032-2, ADT7461-2, LM89-1, and LM99-1 have address 0x4d.
* MAX6659 can have address 0x4c, 0x4d or 0x4e (unsupported).
- * ADT7461 always has address 0x4c.
*/
static unsigned short normal_i2c[] = { 0x4c, 0x4d, I2C_CLIENT_END };
*/
static struct i2c_driver lm90_driver = {
- .owner = THIS_MODULE,
- .name = "lm90",
+ .driver = {
+ .name = "lm90",
+ },
.id = I2C_DRIVERID_LM90,
- .flags = I2C_DF_NOTIFY,
.attach_adapter = lm90_attach_adapter,
.detach_client = lm90_detach_client,
};
struct lm90_data {
struct i2c_client client;
struct class_device *class_dev;
- struct semaphore update_lock;
+ struct mutex update_lock;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
int kind;
long val = simple_strtol(buf, NULL, 10);
int nr = attr->index;
- down(&data->update_lock);
+ mutex_lock(&data->update_lock);
if (data->kind == adt7461)
data->temp8[nr] = TEMP1_TO_REG_ADT7461(val);
else
data->temp8[nr] = TEMP1_TO_REG(val);
i2c_smbus_write_byte_data(client, reg[nr - 1], data->temp8[nr]);
- up(&data->update_lock);
+ mutex_unlock(&data->update_lock);
return count;
}
long val = simple_strtol(buf, NULL, 10);
int nr = attr->index;
- down(&data->update_lock);
+ mutex_lock(&data->update_lock);
if (data->kind == adt7461)
data->temp11[nr] = TEMP2_TO_REG_ADT7461(val);
else
data->temp11[nr] >> 8);
i2c_smbus_write_byte_data(client, reg[(nr - 1) * 2 + 1],
data->temp11[nr] & 0xff);
- up(&data->update_lock);
+ mutex_unlock(&data->update_lock);
return count;
}
long val = simple_strtol(buf, NULL, 10);
long hyst;
- down(&data->update_lock);
+ mutex_lock(&data->update_lock);
hyst = TEMP1_FROM_REG(data->temp8[3]) - val;
i2c_smbus_write_byte_data(client, LM90_REG_W_TCRIT_HYST,
HYST_TO_REG(hyst));
- up(&data->update_lock);
+ mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temphyst, NULL, 4);
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
+/* pec used for ADM1032 only */
+static ssize_t show_pec(struct device *dev, struct device_attribute *dummy,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ return sprintf(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
+}
+
+static ssize_t set_pec(struct device *dev, struct device_attribute *dummy,
+ const char *buf, size_t count)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ long val = simple_strtol(buf, NULL, 10);
+
+ switch (val) {
+ case 0:
+ client->flags &= ~I2C_CLIENT_PEC;
+ break;
+ case 1:
+ client->flags |= I2C_CLIENT_PEC;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
+
/*
* Real code
*/
+/* The ADM1032 supports PEC but not on write byte transactions, so we need
+ to explicitely ask for a transaction without PEC. */
+static inline s32 adm1032_write_byte(struct i2c_client *client, u8 value)
+{
+ return i2c_smbus_xfer(client->adapter, client->addr,
+ client->flags & ~I2C_CLIENT_PEC,
+ I2C_SMBUS_WRITE, value, I2C_SMBUS_BYTE, NULL);
+}
+
+/* It is assumed that client->update_lock is held (unless we are in
+ detection or initialization steps). This matters when PEC is enabled,
+ because we don't want the address pointer to change between the write
+ byte and the read byte transactions. */
+static int lm90_read_reg(struct i2c_client* client, u8 reg, u8 *value)
+{
+ int err;
+
+ if (client->flags & I2C_CLIENT_PEC) {
+ err = adm1032_write_byte(client, reg);
+ if (err >= 0)
+ err = i2c_smbus_read_byte(client);
+ } else
+ err = i2c_smbus_read_byte_data(client, reg);
+
+ if (err < 0) {
+ dev_warn(&client->dev, "Register %#02x read failed (%d)\n",
+ reg, err);
+ return err;
+ }
+ *value = err;
+
+ return 0;
+}
+
static int lm90_attach_adapter(struct i2c_adapter *adapter)
{
if (!(adapter->class & I2C_CLASS_HWMON))
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
goto exit;
- if (!(data = kmalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
+ if (!(data = kzalloc(sizeof(struct lm90_data), GFP_KERNEL))) {
err = -ENOMEM;
goto exit;
}
- memset(data, 0, sizeof(struct lm90_data));
/* The common I2C client data is placed right before the
LM90-specific data. */
if (kind < 0) { /* detection and identification */
u8 man_id, chip_id, reg_config1, reg_convrate;
- man_id = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_MAN_ID);
- chip_id = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CHIP_ID);
- reg_config1 = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONFIG1);
- reg_convrate = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONVRATE);
+ if (lm90_read_reg(new_client, LM90_REG_R_MAN_ID,
+ &man_id) < 0
+ || lm90_read_reg(new_client, LM90_REG_R_CHIP_ID,
+ &chip_id) < 0
+ || lm90_read_reg(new_client, LM90_REG_R_CONFIG1,
+ ®_config1) < 0
+ || lm90_read_reg(new_client, LM90_REG_R_CONVRATE,
+ ®_convrate) < 0)
+ goto exit_free;
if (man_id == 0x01) { /* National Semiconductor */
u8 reg_config2;
- reg_config2 = i2c_smbus_read_byte_data(new_client,
- LM90_REG_R_CONFIG2);
+ if (lm90_read_reg(new_client, LM90_REG_R_CONFIG2,
+ ®_config2) < 0)
+ goto exit_free;
if ((reg_config1 & 0x2A) == 0x00
&& (reg_config2 & 0xF8) == 0x00
}
} else
if (man_id == 0x41) { /* Analog Devices */
- if (address == 0x4C
- && (chip_id & 0xF0) == 0x40 /* ADM1032 */
+ if ((chip_id & 0xF0) == 0x40 /* ADM1032 */
&& (reg_config1 & 0x3F) == 0x00
&& reg_convrate <= 0x0A) {
kind = adm1032;
} else
- if (address == 0x4c
- && chip_id == 0x51 /* ADT7461 */
+ if (chip_id == 0x51 /* ADT7461 */
&& (reg_config1 & 0x1F) == 0x00 /* check compat mode */
&& reg_convrate <= 0x0A) {
kind = adt7461;
name = "lm90";
} else if (kind == adm1032) {
name = "adm1032";
+ /* The ADM1032 supports PEC, but only if combined
+ transactions are not used. */
+ if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
+ new_client->flags |= I2C_CLIENT_PEC;
} else if (kind == lm99) {
name = "lm99";
} else if (kind == lm86) {
strlcpy(new_client->name, name, I2C_NAME_SIZE);
data->valid = 0;
data->kind = kind;
- init_MUTEX(&data->update_lock);
+ mutex_init(&data->update_lock);
/* Tell the I2C layer a new client has arrived */
if ((err = i2c_attach_client(new_client)))
&sensor_dev_attr_temp2_crit_hyst.dev_attr);
device_create_file(&new_client->dev, &dev_attr_alarms);
+ if (new_client->flags & I2C_CLIENT_PEC)
+ device_create_file(&new_client->dev, &dev_attr_pec);
+
return 0;
exit_detach:
*/
i2c_smbus_write_byte_data(client, LM90_REG_W_CONVRATE,
5); /* 2 Hz */
- config = i2c_smbus_read_byte_data(client, LM90_REG_R_CONFIG1);
+ if (lm90_read_reg(client, LM90_REG_R_CONFIG1, &config) < 0) {
+ dev_warn(&client->dev, "Initialization failed!\n");
+ return;
+ }
if (config & 0x40)
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
config & 0xBF); /* run */
struct i2c_client *client = to_i2c_client(dev);
struct lm90_data *data = i2c_get_clientdata(client);
- down(&data->update_lock);
+ mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
- u8 oldh, newh;
+ u8 oldh, newh, l;
dev_dbg(&client->dev, "Updating lm90 data.\n");
- data->temp8[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_TEMP);
- data->temp8[1] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_LOW);
- data->temp8[2] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_HIGH);
- data->temp8[3] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_LOCAL_CRIT);
- data->temp8[4] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_CRIT);
- data->temp_hyst = i2c_smbus_read_byte_data(client,
- LM90_REG_R_TCRIT_HYST);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_TEMP, &data->temp8[0]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_LOW, &data->temp8[1]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_HIGH, &data->temp8[2]);
+ lm90_read_reg(client, LM90_REG_R_LOCAL_CRIT, &data->temp8[3]);
+ lm90_read_reg(client, LM90_REG_R_REMOTE_CRIT, &data->temp8[4]);
+ lm90_read_reg(client, LM90_REG_R_TCRIT_HYST, &data->temp_hyst);
/*
* There is a trick here. We have to read two registers to
* then we have a valid reading. Else we have to read the low
* byte again, and now we believe we have a correct reading.
*/
- oldh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- data->temp11[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPL);
- newh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- if (newh != oldh) {
- data->temp11[0] = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPL);
-#ifdef DEBUG
- oldh = i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_TEMPH);
- /* oldh is actually newer */
- if (newh != oldh)
- dev_warn(&client->dev, "Remote temperature may be "
- "wrong.\n");
-#endif
- }
- data->temp11[0] |= (newh << 8);
-
- data->temp11[1] = (i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_LOWH) << 8) +
- i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_LOWL);
- data->temp11[2] = (i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_HIGHH) << 8) +
- i2c_smbus_read_byte_data(client,
- LM90_REG_R_REMOTE_HIGHL);
- data->alarms = i2c_smbus_read_byte_data(client,
- LM90_REG_R_STATUS);
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &oldh) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPH, &newh) == 0
+ && (newh == oldh
+ || lm90_read_reg(client, LM90_REG_R_REMOTE_TEMPL, &l) == 0))
+ data->temp11[0] = (newh << 8) | l;
+
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_LOWH, &newh) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_LOWL, &l) == 0)
+ data->temp11[1] = (newh << 8) | l;
+ if (lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHH, &newh) == 0
+ && lm90_read_reg(client, LM90_REG_R_REMOTE_HIGHL, &l) == 0)
+ data->temp11[2] = (newh << 8) | l;
+ lm90_read_reg(client, LM90_REG_R_STATUS, &data->alarms);
data->last_updated = jiffies;
data->valid = 1;
}
- up(&data->update_lock);
+ mutex_unlock(&data->update_lock);
return data;
}
projects / linux-2.6-omap-h63xx.git / blobdiff