hwmon: (ntc_thermistor) Merge platform data into driver

Platform data is supposed to be used with "board files",
device descriptions in C. Since the introduction of the
NTC driver in 2011, no such platforms have been submitted
to the Linux kernel, and their use is strongly discouraged
in favor of Device Tree, ACPI or as last resort software
firmware nodes.

Drop the external header and copy the platform data into
the driver file.

Cc: Peter Rosin <[email protected]>
Cc: Chris Lesiak <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

drivers/hwmon/ntc_thermistor.c

@@ -14,12 +14,45 @@
 #include <linux/of.h>
 #include <linux/of_device.h>
 #include <linux/fixp-arith.h>
+#include <linux/iio/consumer.h>
+#include <linux/hwmon.h>
 
-#include <linux/platform_data/ntc_thermistor.h>
+enum ntc_thermistor_type {
+	TYPE_B57330V2103,
+	TYPE_B57891S0103,
+	TYPE_NCPXXWB473,
+	TYPE_NCPXXWF104,
+	TYPE_NCPXXWL333,
+	TYPE_NCPXXXH103,
+};
 
-#include <linux/iio/consumer.h>
+struct ntc_thermistor_platform_data {
+	/*
+	 * One (not both) of read_uV and read_ohm should be provided and only
+	 * one of the two should be provided.
+	 * Both functions should return negative value for an error case.
+	 *
+	 * pullup_uV, pullup_ohm, pulldown_ohm, and connect are required to use
+	 * read_uV()
+	 *
+	 * How to setup pullup_ohm, pulldown_ohm, and connect is
+	 * described at Documentation/hwmon/ntc_thermistor.rst
+	 *
+	 * pullup/down_ohm: 0 for infinite / not-connected
+	 *
+	 * chan: iio_channel pointer to communicate with the ADC which the
+	 * thermistor is using for conversion of the analog values.
+	 */
+	int (*read_uv)(struct ntc_thermistor_platform_data *);
+	unsigned int pullup_uv;
 
-#include <linux/hwmon.h>
+	unsigned int pullup_ohm;
+	unsigned int pulldown_ohm;
+	enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect;
+	struct iio_channel *chan;
+
+	int (*read_ohm)(void);
+};
 
 struct ntc_compensation {
 	int		temp_c;
@@ -651,8 +684,6 @@ static int ntc_thermistor_probe(struct platform_device *pdev)
 	pdata = ntc_thermistor_parse_dt(dev);
 	if (IS_ERR(pdata))
 		return PTR_ERR(pdata);
-	else if (pdata == NULL)
-		pdata = dev_get_platdata(dev);
 
 	if (!pdata) {
 		dev_err(dev, "No platform init data supplied.\n");