From 87102808d03948c825c3bdc48316e48f6422fd7e Mon Sep 17 00:00:00 2001
From: Guenter Roeck <guenter.roeck@ericsson.com>
Date: Fri, 30 Sep 2011 11:53:25 -0700
Subject: hwmon: (pmbus/adm1275) Validate device ID
Since manufacturer and device ID are known, read and validate it.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
[Dan Carpenter <dan.carpenter@oracle.com>: Fixed memory leak]
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
---
drivers/hwmon/pmbus/adm1275.c | 71 ++++++++++++++++++++++++++++++-------------
1 file changed, 50 insertions(+), 21 deletions(-)
(limited to 'drivers')
diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
index 980a4d9d502..81c7c2ead6f 100644
--- a/drivers/hwmon/pmbus/adm1275.c
+++ b/drivers/hwmon/pmbus/adm1275.c
@@ -170,35 +170,71 @@ static int adm1275_read_byte_data(struct i2c_client *client, int page, int reg)
return ret;
}
+static const struct i2c_device_id adm1275_id[] = {
+ { "adm1275", adm1275 },
+ { "adm1276", adm1276 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, adm1275_id);
+
static int adm1275_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
+ u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
int config, device_config;
int ret;
struct pmbus_driver_info *info;
struct adm1275_data *data;
+ const struct i2c_device_id *mid;
if (!i2c_check_functionality(client->adapter,
- I2C_FUNC_SMBUS_READ_BYTE_DATA))
+ I2C_FUNC_SMBUS_READ_BYTE_DATA
+ | I2C_FUNC_SMBUS_BLOCK_DATA))
return -ENODEV;
- data = kzalloc(sizeof(struct adm1275_data), GFP_KERNEL);
- if (!data)
- return -ENOMEM;
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, block_buffer);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read Manufacturer ID\n");
+ return ret;
+ }
+ if (ret != 3 || strncmp(block_buffer, "ADI", 3)) {
+ dev_err(&client->dev, "Unsupported Manufacturer ID\n");
+ return -ENODEV;
+ }
- config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
- if (config < 0) {
- ret = config;
- goto err_mem;
+ ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, block_buffer);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to read Manufacturer Model\n");
+ return ret;
+ }
+ for (mid = adm1275_id; mid->name[0]; mid++) {
+ if (!strncasecmp(mid->name, block_buffer, strlen(mid->name)))
+ break;
+ }
+ if (!mid->name[0]) {
+ dev_err(&client->dev, "Unsupported device\n");
+ return -ENODEV;
}
+ if (id->driver_data != mid->driver_data)
+ dev_notice(&client->dev,
+ "Device mismatch: Configured %s, detected %s\n",
+ id->name, mid->name);
+
+ config = i2c_smbus_read_byte_data(client, ADM1275_PMON_CONFIG);
+ if (config < 0)
+ return config;
+
device_config = i2c_smbus_read_byte_data(client, ADM1275_DEVICE_CONFIG);
- if (device_config < 0) {
- ret = device_config;
- goto err_mem;
- }
+ if (device_config < 0)
+ return device_config;
+
+ data = kzalloc(sizeof(struct adm1275_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->id = mid->driver_data;
- data->id = id->driver_data;
info = &data->info;
info->pages = 1;
@@ -233,7 +269,7 @@ static int adm1275_probe(struct i2c_client *client,
if (device_config & ADM1275_IOUT_WARN2_SELECT)
data->have_oc_fault = true;
- switch (id->driver_data) {
+ switch (data->id) {
case adm1275:
if (config & ADM1275_VIN_VOUT_SELECT)
info->func[0] |=
@@ -281,13 +317,6 @@ static int adm1275_remove(struct i2c_client *client)
return 0;
}
-static const struct i2c_device_id adm1275_id[] = {
- { "adm1275", adm1275 },
- { "adm1276", adm1276 },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, adm1275_id);
-
static struct i2c_driver adm1275_driver = {
.driver = {
.name = "adm1275",
--
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