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hwmon: (w83795) Add support for dynamic in0-2 limits 

The W83795G can be configured to set the in0, in1 and/or in2 voltage
limits dynamically based on VID input pins. Switch the respective
sysfs attributes to read-only.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2010-10-28 20:31:46 +02:00 committed by Jean Delvare
parent 6c82b2f3fb
commit 0e256018b0
1 changed files with 56 additions and 0 deletions
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56
drivers/hwmon/w83795.c
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@ -316,6 +316,7 @@ struct w83795_data {
u8 bank;
u32 has_in; /* Enable monitor VIN or not */
u8 has_dyn_in; /* Only in2-0 can have this */
u16 in[21][3]; /* Register value, read/high/low */
u8 in_lsb[10][3]; /* LSB Register value, high/low */
u8 has_gain; /* has gain: in17-20 * 8 */
@ -450,6 +451,23 @@ static struct w83795_data *w83795_update_device(struct device *dev)
data->in[i][IN_READ] = tmp;
}
/* in0-2 can have dynamic limits (W83795G only) */
if (data->has_dyn_in) {
u8 lsb_max = w83795_read(client, IN_LSB_REG(0, IN_MAX));
u8 lsb_low = w83795_read(client, IN_LSB_REG(0, IN_LOW));
for (i = 0; i < 3; i++) {
if (!(data->has_dyn_in & (1 << i)))
continue;
data->in[i][IN_MAX] =
w83795_read(client, W83795_REG_IN[i][IN_MAX]);
data->in[i][IN_LOW] =
w83795_read(client, W83795_REG_IN[i][IN_LOW]);
data->in_lsb[i][IN_MAX] = (lsb_max >> (2 * i)) & 0x03;
data->in_lsb[i][IN_LOW] = (lsb_low >> (2 * i)) & 0x03;
}
}
/* Update fan */
for (i = 0; i < ARRAY_SIZE(data->fan); i++) {
if (!(data->has_fan & (1 << i)))
@ -1450,6 +1468,8 @@ store_sf_setup(struct device *dev, struct device_attribute *attr,
#define NOT_USED -1
/* Don't change the attribute order, _max and _min are accessed by index
* somewhere else in the code */
#define SENSOR_ATTR_IN(index) { \
SENSOR_ATTR_2(in##index##_input, S_IRUGO, show_in, NULL, \
IN_READ, index), \
@ -1844,6 +1864,39 @@ static int device_remove_file_wrapper(struct device *dev,
return 0;
}
static void w83795_check_dynamic_in_limits(struct i2c_client *client)
{
struct w83795_data *data = i2c_get_clientdata(client);
u8 vid_ctl;
int i, err_max, err_min;
vid_ctl = w83795_read(client, W83795_REG_VID_CTRL);
/* Return immediately if VRM isn't configured */
if ((vid_ctl & 0x07) == 0x00 || (vid_ctl & 0x07) == 0x07)
return;
data->has_dyn_in = (vid_ctl >> 3) & 0x07;
for (i = 0; i < 2; i++) {
if (!(data->has_dyn_in & (1 << i)))
continue;
/* Voltage limits in dynamic mode, switch to read-only */
err_max = sysfs_chmod_file(&client->dev.kobj,
&w83795_in[i][2].dev_attr.attr,
S_IRUGO);
err_min = sysfs_chmod_file(&client->dev.kobj,
&w83795_in[i][3].dev_attr.attr,
S_IRUGO);
if (err_max || err_min)
dev_warn(&client->dev, "Failed to set in%d limits "
"read-only (%d, %d)\n", i, err_max, err_min);
else
dev_info(&client->dev, "in%d limits set dynamically "
"from VID\n", i);
}
}
/* Check pins that can be used for either temperature or voltage monitoring */
static void w83795_apply_temp_config(struct w83795_data *data, u8 config,
int temp_chan, int in_chan)
@ -2049,6 +2102,9 @@ static int w83795_probe(struct i2c_client *client,
if (err)
goto exit_remove;
if (data->chip_type == w83795g)
w83795_check_dynamic_in_limits(client);
data->hwmon_dev = hwmon_device_register(dev);
if (IS_ERR(data->hwmon_dev)) {
err = PTR_ERR(data->hwmon_dev);