hwmon: (mcp3021) add devicetree support
Support setting the reference voltage from the device tree. Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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@ -4,6 +4,7 @@
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* Copyright (C) 2008-2009, 2012 Freescale Semiconductor, Inc.
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* Author: Mingkai Hu <Mingkai.hu@freescale.com>
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* Reworked by Sven Schuchmann <schuchmann@schleissheimer.de>
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* DT support added by Clemens Gruber <clemens.gruber@pqgruber.com>
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*
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* This driver export the value of analog input voltage to sysfs, the
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* voltage unit is mV. Through the sysfs interface, lm-sensors tool
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@ -22,11 +23,13 @@
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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/* Vdd info */
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#define MCP3021_VDD_MAX 5500
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#define MCP3021_VDD_MIN 2700
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#define MCP3021_VDD_REF 3300
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/* Vdd / reference voltage in millivolt */
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#define MCP3021_VDD_REF_MAX 5500
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#define MCP3021_VDD_REF_MIN 2700
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#define MCP3021_VDD_REF_DEFAULT 3300
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/* output format */
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#define MCP3021_SAR_SHIFT 2
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@ -47,7 +50,7 @@ enum chips {
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*/
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struct mcp3021_data {
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struct device *hwmon_dev;
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u32 vdd; /* device power supply */
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u32 vdd; /* supply and reference voltage in millivolt */
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u16 sar_shift;
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u16 sar_mask;
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u8 output_res;
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@ -106,6 +109,7 @@ static int mcp3021_probe(struct i2c_client *client,
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{
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int err;
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struct mcp3021_data *data = NULL;
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struct device_node *np = client->dev.of_node;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
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return -ENODEV;
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@ -117,6 +121,21 @@ static int mcp3021_probe(struct i2c_client *client,
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i2c_set_clientdata(client, data);
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if (np) {
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if (!of_property_read_u32(np, "reference-voltage-microvolt",
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&data->vdd))
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data->vdd /= 1000;
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else
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data->vdd = MCP3021_VDD_REF_DEFAULT;
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} else {
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u32 *pdata = dev_get_platdata(&client->dev);
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if (pdata)
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data->vdd = *pdata;
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else
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data->vdd = MCP3021_VDD_REF_DEFAULT;
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}
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switch (id->driver_data) {
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case mcp3021:
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data->sar_shift = MCP3021_SAR_SHIFT;
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@ -131,13 +150,8 @@ static int mcp3021_probe(struct i2c_client *client,
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break;
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}
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if (dev_get_platdata(&client->dev)) {
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data->vdd = *(u32 *)dev_get_platdata(&client->dev);
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if (data->vdd > MCP3021_VDD_MAX || data->vdd < MCP3021_VDD_MIN)
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if (data->vdd > MCP3021_VDD_REF_MAX || data->vdd < MCP3021_VDD_REF_MIN)
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return -EINVAL;
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} else {
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data->vdd = MCP3021_VDD_REF;
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}
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err = sysfs_create_file(&client->dev.kobj, &dev_attr_in0_input.attr);
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if (err)
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@ -173,9 +187,19 @@ static const struct i2c_device_id mcp3021_id[] = {
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};
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MODULE_DEVICE_TABLE(i2c, mcp3021_id);
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#ifdef CONFIG_OF
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static const struct of_device_id of_mcp3021_match[] = {
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{ .compatible = "microchip,mcp3021", .data = (void *)mcp3021 },
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{ .compatible = "microchip,mcp3221", .data = (void *)mcp3221 },
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{ }
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};
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MODULE_DEVICE_TABLE(of, of_mcp3021_match);
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#endif
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static struct i2c_driver mcp3021_driver = {
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.driver = {
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.name = "mcp3021",
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.of_match_table = of_match_ptr(of_mcp3021_match),
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},
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.probe = mcp3021_probe,
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.remove = mcp3021_remove,
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