Convert to regmap to be able to use its register caching mechanism.
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
v2: Fix show_bit() function
drivers/hwmon/emc1403.c | 117 ++++++++++++++++++++++++++----------------------
1 file changed, 63 insertions(+), 54 deletions(-)
diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
index 0bb0bab..3c9a8a9 100644
--- a/drivers/hwmon/emc1403.c
+++ b/drivers/hwmon/emc1403.c
@@ -18,9 +18,6 @@
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * TODO
- * - cache alarm and critical limit registers
*/
#include <linux/module.h>
@@ -32,7 +29,7 @@
#include <linux/err.h>
#include <linux/sysfs.h>
#include <linux/mutex.h>
-#include <linux/jiffies.h>
+#include <linux/regmap.h>
#define THERMAL_PID_REG 0xfd
#define THERMAL_SMSC_ID_REG 0xfe
@@ -41,15 +38,9 @@
enum emc1403_chip { emc1402, emc1403, emc1404 };
struct thermal_data {
- struct i2c_client *client;
- const struct attribute_group *groups[4];
+ struct regmap *regmap;
struct mutex mutex;
- /*
- * Cache the hyst value so we don't keep re-reading it. In theory
- * we could cache it forever as nobody else should be writing it.
- */
- u8 cached_hyst;
- unsigned long hyst_valid;
+ const struct attribute_group *groups[4];
};
static ssize_t show_temp(struct device *dev,
@@ -57,12 +48,13 @@ static ssize_t show_temp(struct device *dev,
{
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
struct thermal_data *data = dev_get_drvdata(dev);
+ unsigned int val;
int retval;
- retval = i2c_smbus_read_byte_data(data->client, sda->index);
+ retval = regmap_read(data->regmap, sda->index, &val);
if (retval < 0)
return retval;
- return sprintf(buf, "%d000\n", retval);
+ return sprintf(buf, "%d000\n", val);
}
static ssize_t show_bit(struct device *dev,
@@ -70,12 +62,13 @@ static ssize_t show_bit(struct device *dev,
{
struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
struct thermal_data *data = dev_get_drvdata(dev);
+ unsigned int val;
int retval;
- retval = i2c_smbus_read_byte_data(data->client, sda->nr);
+ retval = regmap_read(data->regmap, sda->nr, &val);
if (retval < 0)
return retval;
- return sprintf(buf, "%d\n", !!(retval & sda->index));
+ return sprintf(buf, "%d\n", !!(val & sda->index));
}
static ssize_t store_temp(struct device *dev,
@@ -88,8 +81,8 @@ static ssize_t store_temp(struct device *dev,
if (kstrtoul(buf, 10, &val))
return -EINVAL;
- retval = i2c_smbus_write_byte_data(data->client, sda->index,
- DIV_ROUND_CLOSEST(val, 1000));
+ retval = regmap_write(data->regmap, sda->index,
+ DIV_ROUND_CLOSEST(val, 1000));
if (retval < 0)
return retval;
return count;
@@ -100,28 +93,17 @@ static ssize_t store_bit(struct device *dev,
{
struct sensor_device_attribute_2 *sda = to_sensor_dev_attr_2(attr);
struct thermal_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
unsigned long val;
int retval;
if (kstrtoul(buf, 10, &val))
return -EINVAL;
- mutex_lock(&data->mutex);
- retval = i2c_smbus_read_byte_data(client, sda->nr);
+ retval = regmap_update_bits(data->regmap, sda->nr, sda->index,
+ val ? sda->index : 0);
if (retval < 0)
- goto fail;
-
- retval &= ~sda->index;
- if (val)
- retval |= sda->index;
-
- retval = i2c_smbus_write_byte_data(client, sda->index, retval);
- if (retval == 0)
- retval = count;
-fail:
- mutex_unlock(&data->mutex);
- return retval;
+ return retval;
+ return count;
}
static ssize_t show_hyst(struct device *dev,
@@ -129,22 +111,20 @@ static ssize_t show_hyst(struct device *dev,
{
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
struct thermal_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
+ unsigned int limit;
+ unsigned int hyst;
int retval;
- int hyst;
- retval = i2c_smbus_read_byte_data(client, sda->index);
+ retval = regmap_read(regmap, sda->index, &limit);
if (retval < 0)
return retval;
- if (time_after(jiffies, data->hyst_valid)) {
- hyst = i2c_smbus_read_byte_data(client, 0x21);
- if (hyst < 0)
- return retval;
- data->cached_hyst = hyst;
- data->hyst_valid = jiffies + HZ;
- }
- return sprintf(buf, "%d000\n", retval - data->cached_hyst);
+ retval = regmap_read(regmap, 0x21, &hyst);
+ if (retval < 0)
+ return retval;
+
+ return sprintf(buf, "%d000\n", limit - hyst);
}
static ssize_t store_hyst(struct device *dev,
@@ -152,7 +132,8 @@ static ssize_t store_hyst(struct device *dev,
{
struct sensor_device_attribute *sda = to_sensor_dev_attr(attr);
struct thermal_data *data = dev_get_drvdata(dev);
- struct i2c_client *client = data->client;
+ struct regmap *regmap = data->regmap;
+ unsigned int limit;
int retval;
int hyst;
unsigned long val;
@@ -161,23 +142,20 @@ static ssize_t store_hyst(struct device *dev,
return -EINVAL;
mutex_lock(&data->mutex);
- retval = i2c_smbus_read_byte_data(client, sda->index);
+ retval = regmap_read(regmap, sda->index, &limit);
if (retval < 0)
goto fail;
- hyst = retval * 1000 - val;
+ hyst = limit * 1000 - val;
hyst = DIV_ROUND_CLOSEST(hyst, 1000);
if (hyst < 0 || hyst > 255) {
retval = -ERANGE;
goto fail;
}
- retval = i2c_smbus_write_byte_data(client, 0x21, hyst);
- if (retval == 0) {
+ retval = regmap_write(regmap, 0x21, hyst);
+ if (retval == 0)
retval = count;
- data->cached_hyst = hyst;
- data->hyst_valid = jiffies + HZ;
- }
fail:
mutex_unlock(&data->mutex);
return retval;
@@ -356,6 +334,35 @@ static int emc1403_detect(struct i2c_client *client,
return 0;
}
+static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case 0x00: /* internal diode high byte */
+ case 0x01: /* external diode 1 high byte */
+ case 0x02: /* status */
+ case 0x10: /* external diode 1 low byte */
+ case 0x1b: /* external diode fault */
+ case 0x23: /* external diode 2 high byte */
+ case 0x24: /* external diode 2 low byte */
+ case 0x29: /* internal diode low byte */
+ case 0x2a: /* externl diode 3 high byte */
+ case 0x2b: /* external diode 3 low byte */
+ case 0x35: /* high limit status */
+ case 0x36: /* low limit status */
+ case 0x37: /* therm limit status */
+ return true;
+ default:
+ return false;
+ }
+}
+
+static struct regmap_config emc1403_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .cache_type = REGCACHE_RBTREE,
+ .volatile_reg = emc1403_regmap_is_volatile,
+};
+
static int emc1403_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -367,9 +374,11 @@ static int emc1403_probe(struct i2c_client *client,
if (data == NULL)
return -ENOMEM;
- data->client = client;
+ data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);
+ if (IS_ERR(data->regmap))
+ return PTR_ERR(data->regmap);
+
mutex_init(&data->mutex);
- data->hyst_valid = jiffies - 1; /* Expired */
switch (id->driver_data) {
case emc1404:
--
1.9.1
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