hwmon: (lm75) Create structure to save all the configuration parameters.
* Add to lm75_data kind field to store the kind of device the driver is working with. * Add an structure to store the configuration parameters of all the supported devices. * Delete resolution_limits from lm75_data and include them in the structure described above. * Add a pointer to the configuration parameters structure to be used as a reference to obtain the parameters. * Delete switch-case approach to get the device configuration parameters. * The structure is cleaner and easier to maintain. Signed-off-by: Iker Perez del Palomar Sustatxa <iker.perez@codethink.co.uk> Link: https://lore.kernel.org/r/20190808080246.8371-2-iker.perez@codethink.co.uk Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Iker Perez del Palomar Sustatxa
Guenter Roeck
parent
486842db3b
commit
dcb1265387
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@ -18,7 +18,6 @@
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#include <linux/regmap.h>
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#include "lm75.h"
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/*
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* This driver handles the LM75 and compatible digital temperature sensors.
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*/
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@ -51,6 +50,28 @@ enum lm75_type { /* keep sorted in alphabetical order */
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tmp75c,
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};
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/**
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* struct lm75_params - lm75 configuration parameters.
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* @set_mask: Bits to set in configuration register when configuring
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* the chip.
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* @clr_mask: Bits to clear in configuration register when configuring
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* the chip.
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* @default_resolution: Default number of bits to represent the temperature
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* value.
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* @resolution_limits: Limit register resolution. Optional. Should be set if
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* the resolution of limit registers does not match the
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* resolution of the temperature register.
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* default_sample_time: Sample time to be set by default.
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*/
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struct lm75_params {
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u8 set_mask;
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u8 clr_mask;
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u8 default_resolution;
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u8 resolution_limits;
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unsigned int default_sample_time;
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};
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/* Addresses scanned */
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static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
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0x4d, 0x4e, 0x4f, I2C_CLIENT_END };
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@ -63,15 +84,151 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
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/* Each client has this additional data */
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struct lm75_data {
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struct i2c_client *client;
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struct regmap *regmap;
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u8 orig_conf;
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u8 resolution; /* In bits, between 9 and 16 */
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u8 resolution_limits;
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unsigned int sample_time; /* In ms */
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struct i2c_client *client;
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struct regmap *regmap;
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u8 orig_conf;
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u8 current_conf;
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u8 resolution; /* In bits, 9 to 16 */
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unsigned int sample_time; /* In ms */
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enum lm75_type kind;
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const struct lm75_params *params;
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};
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/*-----------------------------------------------------------------------*/
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/* The structure below stores the configuration values of the supported devices.
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* In case of being supported multiple configurations, the default one must
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* always be the first element of the array
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*/
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static const struct lm75_params device_params[] = {
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[adt75] = {
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.clr_mask = 1 << 5, /* not one-shot mode */
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 8,
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},
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[ds1775] = {
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.clr_mask = 3 << 5,
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.set_mask = 2 << 5, /* 11-bit mode */
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.default_resolution = 11,
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.default_sample_time = MSEC_PER_SEC,
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},
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[ds75] = {
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.clr_mask = 3 << 5,
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.set_mask = 2 << 5, /* 11-bit mode */
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.default_resolution = 11,
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.default_sample_time = MSEC_PER_SEC,
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},
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[stds75] = {
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.clr_mask = 3 << 5,
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.set_mask = 2 << 5, /* 11-bit mode */
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.default_resolution = 11,
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.default_sample_time = MSEC_PER_SEC,
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},
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[stlm75] = {
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.default_resolution = 9,
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.default_sample_time = MSEC_PER_SEC / 5,
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},
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[ds7505] = {
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.set_mask = 3 << 5, /* 12-bit mode*/
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 4,
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},
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[g751] = {
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.default_resolution = 9,
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.default_sample_time = MSEC_PER_SEC / 2,
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},
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[lm75] = {
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.default_resolution = 9,
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.default_sample_time = MSEC_PER_SEC / 2,
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},
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[lm75a] = {
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.default_resolution = 9,
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.default_sample_time = MSEC_PER_SEC / 2,
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},
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[lm75b] = {
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.default_resolution = 11,
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.default_sample_time = MSEC_PER_SEC / 4,
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},
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[max6625] = {
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.default_resolution = 9,
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.default_sample_time = MSEC_PER_SEC / 4,
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},
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[max6626] = {
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 4,
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.resolution_limits = 9,
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},
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[max31725] = {
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.default_resolution = 16,
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.default_sample_time = MSEC_PER_SEC / 8,
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},
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[tcn75] = {
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.default_resolution = 9,
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.default_sample_time = MSEC_PER_SEC / 8,
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},
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[pct2075] = {
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.default_resolution = 11,
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.default_sample_time = MSEC_PER_SEC / 10,
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},
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[mcp980x] = {
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.set_mask = 3 << 5, /* 12-bit mode */
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.clr_mask = 1 << 7, /* not one-shot mode */
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.default_resolution = 12,
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.resolution_limits = 9,
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.default_sample_time = MSEC_PER_SEC,
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},
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[tmp100] = {
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.set_mask = 3 << 5, /* 12-bit mode */
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.clr_mask = 1 << 7, /* not one-shot mode */
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC,
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},
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[tmp101] = {
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.set_mask = 3 << 5, /* 12-bit mode */
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.clr_mask = 1 << 7, /* not one-shot mode */
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC,
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},
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[tmp112] = {
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.set_mask = 3 << 5, /* 12-bit mode */
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.clr_mask = 1 << 7, /* no one-shot mode*/
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 4,
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},
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[tmp105] = {
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.set_mask = 3 << 5, /* 12-bit mode */
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.clr_mask = 1 << 7, /* not one-shot mode*/
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 2,
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},
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[tmp175] = {
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.set_mask = 3 << 5, /* 12-bit mode */
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.clr_mask = 1 << 7, /* not one-shot mode*/
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 2,
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},
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[tmp275] = {
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.set_mask = 3 << 5, /* 12-bit mode */
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.clr_mask = 1 << 7, /* not one-shot mode*/
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 2,
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},
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[tmp75] = {
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.set_mask = 3 << 5, /* 12-bit mode */
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.clr_mask = 1 << 7, /* not one-shot mode*/
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 2,
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},
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[tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */
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.clr_mask = 1 << 7 | 3 << 5,
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 37,
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},
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[tmp75c] = {
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.clr_mask = 1 << 5, /*not one-shot mode*/
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.default_resolution = 12,
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.default_sample_time = MSEC_PER_SEC / 4,
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}
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};
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static inline long lm75_reg_to_mc(s16 temp, u8 resolution)
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{
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@ -146,8 +303,8 @@ static int lm75_write(struct device *dev, enum hwmon_sensor_types type,
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* Resolution of limit registers is assumed to be the same as the
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* temperature input register resolution unless given explicitly.
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*/
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if (data->resolution_limits)
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resolution = data->resolution_limits;
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if (data->params->resolution_limits)
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resolution = data->params->resolution_limits;
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else
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resolution = data->resolution;
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@ -239,7 +396,6 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
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struct device *hwmon_dev;
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struct lm75_data *data;
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int status, err;
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u8 set_mask, clr_mask;
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int new;
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enum lm75_type kind;
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@ -257,6 +413,7 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
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return -ENOMEM;
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data->client = client;
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data->kind = kind;
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data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config);
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if (IS_ERR(data->regmap))
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@ -265,109 +422,22 @@ lm75_probe(struct i2c_client *client, const struct i2c_device_id *id)
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/* Set to LM75 resolution (9 bits, 1/2 degree C) and range.
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* Then tweak to be more precise when appropriate.
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*/
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set_mask = 0;
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clr_mask = LM75_SHUTDOWN; /* continuous conversions */
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switch (kind) {
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case adt75:
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clr_mask |= 1 << 5; /* not one-shot mode */
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data->resolution = 12;
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data->sample_time = MSEC_PER_SEC / 8;
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break;
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case ds1775:
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case ds75:
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case stds75:
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clr_mask |= 3 << 5;
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set_mask |= 2 << 5; /* 11-bit mode */
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data->resolution = 11;
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data->sample_time = MSEC_PER_SEC;
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break;
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case stlm75:
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data->resolution = 9;
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data->sample_time = MSEC_PER_SEC / 5;
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break;
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case ds7505:
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set_mask |= 3 << 5; /* 12-bit mode */
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data->resolution = 12;
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data->sample_time = MSEC_PER_SEC / 4;
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break;
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case g751:
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case lm75:
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case lm75a:
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data->resolution = 9;
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data->sample_time = MSEC_PER_SEC / 2;
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break;
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case lm75b:
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data->resolution = 11;
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data->sample_time = MSEC_PER_SEC / 4;
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break;
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case max6625:
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data->resolution = 9;
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data->sample_time = MSEC_PER_SEC / 4;
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break;
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case max6626:
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data->resolution = 12;
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data->resolution_limits = 9;
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data->sample_time = MSEC_PER_SEC / 4;
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break;
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case max31725:
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data->resolution = 16;
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data->sample_time = MSEC_PER_SEC / 8;
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break;
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case tcn75:
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data->resolution = 9;
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data->sample_time = MSEC_PER_SEC / 8;
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break;
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case pct2075:
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data->resolution = 11;
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data->sample_time = MSEC_PER_SEC / 10;
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break;
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case mcp980x:
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data->resolution_limits = 9;
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/* fall through */
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case tmp100:
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case tmp101:
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set_mask |= 3 << 5; /* 12-bit mode */
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data->resolution = 12;
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data->sample_time = MSEC_PER_SEC;
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clr_mask |= 1 << 7; /* not one-shot mode */
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break;
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case tmp112:
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set_mask |= 3 << 5; /* 12-bit mode */
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clr_mask |= 1 << 7; /* not one-shot mode */
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data->resolution = 12;
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data->sample_time = MSEC_PER_SEC / 4;
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break;
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case tmp105:
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case tmp175:
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case tmp275:
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case tmp75:
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set_mask |= 3 << 5; /* 12-bit mode */
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clr_mask |= 1 << 7; /* not one-shot mode */
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data->resolution = 12;
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data->sample_time = MSEC_PER_SEC / 2;
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break;
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case tmp75b: /* not one-shot mode, Conversion rate 37Hz */
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clr_mask |= 1 << 7 | 0x3 << 5;
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data->resolution = 12;
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data->sample_time = MSEC_PER_SEC / 37;
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break;
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case tmp75c:
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clr_mask |= 1 << 5; /* not one-shot mode */
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data->resolution = 12;
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data->sample_time = MSEC_PER_SEC / 4;
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break;
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}
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data->params = &device_params[data->kind];
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/* configure as specified */
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/* Save default sample time and resolution*/
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data->sample_time = data->params->default_sample_time;
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data->resolution = data->params->default_resolution;
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/* Cache original configuration */
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status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
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if (status < 0) {
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dev_dbg(dev, "Can't read config? %d\n", status);
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return status;
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}
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data->orig_conf = status;
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new = status & ~clr_mask;
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new |= set_mask;
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new = status & ~(data->params->clr_mask | LM75_SHUTDOWN);
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new |= data->params->set_mask;
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if (status != new)
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i2c_smbus_write_byte_data(client, LM75_REG_CONF, new);
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