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authorGuenter Roeck <guenter.roeck@ericsson.com>2011-08-02 11:08:57 -0700
committerGuenter Roeck <guenter.roeck@ericsson.com>2011-10-24 11:09:34 -0700
commitc5e6763667ffc94eaad4634841cb1b7ecd951fb7 (patch)
tree9f12484699dc25462e3275fba42bba65f47644d6 /drivers
parent866cf12a0eab65f94e40608bdd21ca8dea4d0ac2 (diff)
hwmon: (pmbus/adm1275) Add support for second current limit
ADM1275 supports a second current limit, which can be configured as either lower or upper limit. Add support for it and report it as either lower or upper critical current limit. Also replace error return code EINVAL for unsupported pages with ENXIO as this is more appropriate for the observed condition. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Acked-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hwmon/pmbus/adm1275.c95
1 files changed, 88 insertions, 7 deletions
diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
index 424d0d711ccb..7a9f2d9dbba4 100644
--- a/drivers/hwmon/pmbus/adm1275.c
+++ b/drivers/hwmon/pmbus/adm1275.c
@@ -31,14 +31,44 @@
#define ADM1275_VIN_VOUT_SELECT (1 << 6)
#define ADM1275_VRANGE (1 << 5)
+#define ADM1275_IOUT_WARN2_LIMIT 0xd7
+#define ADM1275_DEVICE_CONFIG 0xd8
+
+#define ADM1275_IOUT_WARN2_SELECT (1 << 4)
+
+#define ADM1275_MFR_STATUS_IOUT_WARN2 (1 << 0)
+
+struct adm1275_data {
+ bool have_oc_fault;
+ struct pmbus_driver_info info;
+};
+
+#define to_adm1275_data(x) container_of(x, struct adm1275_data, info)
+
static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ const struct adm1275_data *data = to_adm1275_data(info);
int ret;
if (page)
- return -EINVAL;
+ return -ENXIO;
switch (reg) {
+ case PMBUS_IOUT_UC_FAULT_LIMIT:
+ if (data->have_oc_fault) {
+ ret = -ENXIO;
+ break;
+ }
+ ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
+ break;
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ if (!data->have_oc_fault) {
+ ret = -ENXIO;
+ break;
+ }
+ ret = pmbus_read_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT);
+ break;
case PMBUS_VIRT_READ_IOUT_MAX:
ret = pmbus_read_word_data(client, 0, ADM1275_PEAK_IOUT);
break;
@@ -66,9 +96,14 @@ static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
int ret;
if (page)
- return -EINVAL;
+ return -ENXIO;
switch (reg) {
+ case PMBUS_IOUT_UC_FAULT_LIMIT:
+ case PMBUS_IOUT_OC_FAULT_LIMIT:
+ ret = pmbus_write_word_data(client, 0, ADM1275_IOUT_WARN2_LIMIT,
+ word);
+ break;
case PMBUS_VIRT_RESET_IOUT_HISTORY:
ret = pmbus_write_word_data(client, 0, ADM1275_PEAK_IOUT, 0);
break;
@@ -85,19 +120,52 @@ static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
return ret;
}
+static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
+{
+ const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ const struct adm1275_data *data = to_adm1275_data(info);
+ int mfr_status, ret;
+
+ if (page)
+ return -ENXIO;
+
+ switch (reg) {
+ case PMBUS_STATUS_IOUT:
+ ret = pmbus_read_byte_data(client, page, PMBUS_STATUS_IOUT);
+ if (ret < 0)
+ break;
+ mfr_status = pmbus_read_byte_data(client, page,
+ PMBUS_STATUS_MFR_SPECIFIC);
+ if (mfr_status < 0) {
+ ret = mfr_status;
+ break;
+ }
+ if (mfr_status & ADM1275_MFR_STATUS_IOUT_WARN2) {
+ ret |= data->have_oc_fault ?
+ PB_IOUT_OC_FAULT : PB_IOUT_UC_FAULT;
+ }
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
static int adm1275_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
- int config;
+ int config, device_config;
int ret;
struct pmbus_driver_info *info;
+ struct adm1275_data *data;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA))
return -ENODEV;
- info = kzalloc(sizeof(struct pmbus_driver_info), GFP_KERNEL);
- if (!info)
+ data = kzalloc(sizeof(struct adm1275_data), GFP_KERNEL);
+ if (!data)
return -ENOMEM;
config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
@@ -106,6 +174,14 @@ static int adm1275_probe(struct i2c_client *client,
goto err_mem;
}
+ device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
+ if (device_config < 0) {
+ ret = device_config;
+ goto err_mem;
+ }
+
+ info = &data->info;
+
info->pages = 1;
info->format[PSC_VOLTAGE_IN] = direct;
info->format[PSC_VOLTAGE_OUT] = direct;
@@ -116,6 +192,7 @@ static int adm1275_probe(struct i2c_client *client,
info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
info->read_word_data = adm1275_read_word_data;
+ info->read_byte_data = adm1275_read_byte_data;
info->write_word_data = adm1275_write_word_data;
if (config & ADM1275_VRANGE) {
@@ -134,6 +211,9 @@ static int adm1275_probe(struct i2c_client *client,
info->R[PSC_VOLTAGE_OUT] = -1;
}
+ if (device_config & ADM1275_IOUT_WARN2_SELECT)
+ data->have_oc_fault = true;
+
if (config & ADM1275_VIN_VOUT_SELECT)
info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
else
@@ -145,16 +225,17 @@ static int adm1275_probe(struct i2c_client *client,
return 0;
err_mem:
- kfree(info);
+ kfree(data);
return ret;
}
static int adm1275_remove(struct i2c_client *client)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
+ const struct adm1275_data *data = to_adm1275_data(info);
pmbus_do_remove(client);
- kfree(info);
+ kfree(data);
return 0;
}