diff options
Diffstat (limited to 'target/linux/apm821xx/patches-4.19/803-hwmon-tc654-add-detection-routine.patch')
| -rw-r--r-- | target/linux/apm821xx/patches-4.19/803-hwmon-tc654-add-detection-routine.patch | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/target/linux/apm821xx/patches-4.19/803-hwmon-tc654-add-detection-routine.patch b/target/linux/apm821xx/patches-4.19/803-hwmon-tc654-add-detection-routine.patch new file mode 100644 index 0000000000..f8b30ae1b3 --- /dev/null +++ b/target/linux/apm821xx/patches-4.19/803-hwmon-tc654-add-detection-routine.patch @@ -0,0 +1,65 @@ +From 694f9bfb8efaef8a33e8992015ff9d0866faf4a2 Mon Sep 17 00:00:00 2001 +From: Christian Lamparter <chunkeey@gmail.com> +Date: Sun, 17 Dec 2017 17:27:15 +0100 +Subject: [PATCH 1/2] hwmon: tc654 add detection routine + +This patch adds a detection routine for the TC654/TC655 +chips. Both IDs are listed in the Datasheet. + +Signed-off-by: Christian Lamparter <chunkeey@gmail.com> +--- + drivers/hwmon/tc654.c | 29 +++++++++++++++++++++++++++++ + 1 file changed, 29 insertions(+) + +--- a/drivers/hwmon/tc654.c ++++ b/drivers/hwmon/tc654.c +@@ -64,6 +64,11 @@ enum tc654_regs { + /* Register data is read (and cached) at most once per second. */ + #define TC654_UPDATE_INTERVAL HZ + ++/* Manufacturer and Version Identification Register Values */ ++#define TC654_MFR_ID_MICROCHIP 0x84 ++#define TC654_VER_ID 0x00 ++#define TC655_VER_ID 0x01 ++ + struct tc654_data { + struct i2c_client *client; + +@@ -497,6 +502,29 @@ static const struct i2c_device_id tc654_ + {} + }; + ++static int ++tc654_detect(struct i2c_client *new_client, struct i2c_board_info *info) ++{ ++ struct i2c_adapter *adapter = new_client->adapter; ++ int manufacturer, product; ++ ++ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) ++ return -ENODEV; ++ ++ manufacturer = i2c_smbus_read_byte_data(new_client, TC654_REG_MFR_ID); ++ if (manufacturer != TC654_MFR_ID_MICROCHIP) ++ return -ENODEV; ++ ++ product = i2c_smbus_read_byte_data(new_client, TC654_REG_VER_ID); ++ if (!((product == TC654_VER_ID) || (product == TC655_VER_ID))) ++ return -ENODEV; ++ ++ strlcpy(info->type, product == TC654_VER_ID ? "tc654" : "tc655", ++ I2C_NAME_SIZE); ++ return 0; ++} ++ ++ + MODULE_DEVICE_TABLE(i2c, tc654_id); + + static struct i2c_driver tc654_driver = { +@@ -505,6 +533,7 @@ static struct i2c_driver tc654_driver = + }, + .probe = tc654_probe, + .id_table = tc654_id, ++ .detect = tc654_detect, + }; + + module_i2c_driver(tc654_driver); |