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authorXie Xiaobo <X.Xie@freescale.com>2012-03-23 10:02:20 +0100
committerJean Delvare <khali@endymion.delvare>2012-03-23 10:02:20 +0100
commit5510e62a66bad22b104d5d854445523d7f5754f7 (patch)
treea580bd3fff0831628bc0d525d975853bbf25a86d /Documentation/hwmon
parent0c2732152a5813a870d0b96f0844f4dfe1436519 (diff)
downloadlinux-5510e62a66bad22b104d5d854445523d7f5754f7.tar.bz2
hwmon: Add MCP3021 ADC driver
Add I2C driver for MCP3021 that is an ADC chip from Microchip. The MCP3021 is a successive approximation A/D converter (ADC) with 10-bit resolution. The driver export the value of Vin to sysfs, the voltage unit is mV. Through the sysfs interface, lm-sensors tool can also display Vin voltage. Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com> Signed-off-by: Xie Xiaobo <X.Xie@freescale.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation/hwmon')
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diff --git a/Documentation/hwmon/mcp3021 b/Documentation/hwmon/mcp3021
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+Kernel driver MCP3021
+======================
+
+Supported chips:
+ * Microchip Technology MCP3021
+ Prefix: 'mcp3021'
+ Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/21805a.pdf
+
+Author: Mingkai Hu
+
+Description
+-----------
+
+This driver implements support for the Microchip Technology MCP3021 chip.
+
+The Microchip Technology Inc. MCP3021 is a successive approximation A/D
+converter (ADC) with 10-bit resolution.
+This device provides one single-ended input with very low power consumption.
+Communication to the MCP3021 is performed using a 2-wire I2C compatible
+interface. Standard (100 kHz) and Fast (400 kHz) I2C modes are available.
+The default I2C device address is 0x4d (contact the Microchip factory for
+additional address options).