[PATCH] hwmon: (lm90) Add device tree support
From: Vincent Palatin
Date: Fri Feb 01 2013 - 16:18:49 EST
Add support to instantiate LM90-compatible sensors from a device-tree
configuration.
When the kernel has device tree support, we avoid doing the auto-detection
as probing the busses might mess-up sensitive I2C devices or trigger long
timeouts on non-functional busses.
Signed-off-by: Vincent Palatin <vpalatin@xxxxxxxxxxxx>
---
.../devicetree/bindings/i2c/trivial-devices.txt | 19 +++++++++
.../devicetree/bindings/vendor-prefixes.txt | 1 +
drivers/hwmon/lm90.c | 47 +++++++++++++++++++++-
3 files changed, 65 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
index 446859f..4d991ca 100644
--- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
+++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
@@ -10,6 +10,7 @@ document for it just like any other devices.
Compatible Vendor / Chip
========== =============
ad,ad7414 SMBus/I2C Digital Temperature Sensor in 6-Pin SOT with SMBus Alert and Over Temperature Pin
+ad,adm1032 +/-1C Remote and local system temperature monitor
ad,adm9240 ADM9240: Complete System Hardware Monitor for uProcessor-Based Systems
adi,adt7461 +/-1C TDM Extended Temp Range I.C
adt7461 +/-1C TDM Extended Temp Range I.C
@@ -35,16 +36,33 @@ fsl,mc13892 MC13892: Power Management Integrated Circuit (PMIC) for i.MX35/51
fsl,mma8450 MMA8450Q: Xtrinsic Low-power, 3-axis Xtrinsic Accelerometer
fsl,mpr121 MPR121: Proximity Capacitive Touch Sensor Controller
fsl,sgtl5000 SGTL5000: Ultra Low-Power Audio Codec
+gmt,g781 +/-1C Remote and local temperature sensor
maxim,ds1050 5 Bit Programmable, Pulse-Width Modulator
maxim,max1237 Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
maxim,max6625 9-Bit/12-Bit Temperature Sensors with IÂC-Compatible Serial Interface
+maxim,max6646 +145C Precision SMBus-Compatible Remote/Local Sensors
+maxim,max6647 +145C Precision SMBus-Compatible Remote/Local Sensors
+maxim,max6649 +145C Precision SMBus-Compatible Remote/Local Sensors
+maxim,max6657 +/-1C SMBus-Compatible Remote/Local Sensors
+maxim,max6658 +/-1C SMBus-Compatible Remote/Local Sensors
+maxim,max6659 +/-1C SMBus-Compatible Remote/Local Sensors
+maxim,max6680 +/-1C Fail-Safe Remote/Local Temperature Sensors
+maxim,max6681 +/-1C Fail-Safe Remote/Local Temperature Sensors
+maxim,max6695 Dual Remote/Local Temperature Sensors
+maxim,max6696 Dual Remote/Local Temperature Sensors
mc,rv3029c2 Real Time Clock Module with I2C-Bus
national,lm75 I2C TEMP SENSOR
national,lm80 Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
+national,lm86 +/-0.75C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
+national,lm89 +/-0.75C Remote and Local Digital Temperature Sensor with Two-Wire Interface-Wire Interface
+national,lm90 +/-3C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
national,lm92 Â0.33ÂC Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface
+national,lm99 +/-1C Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
nxp,pca9556 Octal SMBus and I2C registered interface
nxp,pca9557 8-bit I2C-bus and SMBus I/O port with reset
nxp,pcf8563 Real-time clock/calendar
+nxp,sa56004 remote/local digital temperature sensor with overtemperature alarms
+onnn,nct1008 +/-1C Temperature Monitor with Series Resistance Cancellation
ovti,ov5642 OV5642: Color CMOS QSXGA (5-megapixel) Image Sensor with OmniBSI and Embedded TrueFocus
pericom,pt7c4338 Real-time Clock Module
plx,pex8648 48-Lane, 12-Port PCI Express Gen 2 (5.0 GT/s) Switch
@@ -59,3 +77,4 @@ taos,tsl2550 Ambient Light Sensor with SMBUS/Two Wire Serial Interface
ti,tsc2003 I2C Touch-Screen Controller
ti,tmp102 Low Power Digital Temperature Sensor with SMBUS/Two Wire Serial Interface
ti,tmp275 Digital Temperature Sensor
+winbond,w83l771 H/W Monitor IC
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 902b1b1..2074699 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -23,6 +23,7 @@ est ESTeem Wireless Modems
fsl Freescale Semiconductor
GEFanuc GE Fanuc Intelligent Platforms Embedded Systems, Inc.
gef GE Fanuc Intelligent Platforms Embedded Systems, Inc.
+gmt Global Mixed-mode Technology Inc.
hp Hewlett Packard
ibm International Business Machines (IBM)
idt Integrated Device Technologies, Inc.
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 863412a..c07fd19 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -106,8 +106,11 @@
*/
static const unsigned short normal_i2c[] = {
+#ifndef CONFIG_OF
0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
- 0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
+ 0x4d, 0x4e, 0x4f,
+#endif
+ I2C_CLIENT_END };
enum chips { lm90, adm1032, lm99, lm86, max6657, max6659, adt7461, max6680,
max6646, w83l771, max6696, sa56004, g781 };
@@ -209,6 +212,32 @@ static const struct i2c_device_id lm90_id[] = {
};
MODULE_DEVICE_TABLE(i2c, lm90_id);
+#ifdef CONFIG_OF
+static struct of_device_id lm90_dt_match[] = {
+ { .compatible = "ad,adm1032", .data = (void *)adm1032 },
+ { .compatible = "adi,adt7461", .data = (void *)adt7461 },
+ { .compatible = "gmt,g781", .data = (void *)g781 },
+ { .compatible = "national,lm90", .data = (void *)lm90 },
+ { .compatible = "national,lm86", .data = (void *)lm86 },
+ { .compatible = "national,lm89", .data = (void *)lm86 },
+ { .compatible = "national,lm99", .data = (void *)lm99 },
+ { .compatible = "maxim,max6646", .data = (void *)max6646 },
+ { .compatible = "maxim,max6647", .data = (void *)max6646 },
+ { .compatible = "maxim,max6649", .data = (void *)max6646 },
+ { .compatible = "maxim,max6657", .data = (void *)max6657 },
+ { .compatible = "maxim,max6658", .data = (void *)max6657 },
+ { .compatible = "maxim,max6659", .data = (void *)max6659 },
+ { .compatible = "maxim,max6680", .data = (void *)max6680 },
+ { .compatible = "maxim,max6681", .data = (void *)max6680 },
+ { .compatible = "maxim,max6695", .data = (void *)max6696 },
+ { .compatible = "maxim,max6696", .data = (void *)max6696 },
+ { .compatible = "onnn,nct1008", .data = (void *)adt7461 },
+ { .compatible = "winbond,w83l771", .data = (void *)w83l771 },
+ { .compatible = "nxp,sa56004", .data = (void *)sa56004 },
+ { }
+};
+#endif
+
/*
* chip type specific parameters
*/
@@ -1391,6 +1420,19 @@ static void lm90_init_client(struct i2c_client *client)
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
+static inline int lm90_get_driver_data(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+#ifdef CONFIG_OF
+ if (i2c->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(lm90_dt_match, i2c->dev.of_node);
+ return (int)match->data;
+ }
+#endif
+ return (int)id->driver_data;
+}
+
static int lm90_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -1407,7 +1449,7 @@ static int lm90_probe(struct i2c_client *client,
mutex_init(&data->update_lock);
/* Set the device type */
- data->kind = id->driver_data;
+ data->kind = lm90_get_driver_data(client, id);
if (data->kind == adm1032) {
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
client->flags &= ~I2C_CLIENT_PEC;
@@ -1533,6 +1575,7 @@ static struct i2c_driver lm90_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm90",
+ .of_match_table = of_match_ptr(lm90_dt_match),
},
.probe = lm90_probe,
.remove = lm90_remove,
--
1.8.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/