summaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/max6639.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/hwmon/max6639.c')
-rw-r--r--drivers/hwmon/max6639.c811
1 files changed, 811 insertions, 0 deletions
diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c
new file mode 100644
index 000000000..dd5f4b3b1
--- /dev/null
+++ b/drivers/hwmon/max6639.c
@@ -0,0 +1,811 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * max6639.c - Support for Maxim MAX6639
+ *
+ * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
+ *
+ * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
+ *
+ * based on the initial MAX6639 support from semptian.net
+ * by He Changqing <hechangqing@semptian.com>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/hwmon.h>
+#include <linux/err.h>
+#include <linux/regmap.h>
+#include <linux/util_macros.h>
+
+/* Addresses to scan */
+static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
+
+/* The MAX6639 registers, valid channel numbers: 0, 1 */
+#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
+#define MAX6639_REG_STATUS 0x02
+#define MAX6639_REG_OUTPUT_MASK 0x03
+#define MAX6639_REG_GCONFIG 0x04
+#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
+#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
+#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
+#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
+#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
+#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
+#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
+#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
+#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
+#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
+#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
+#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
+#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
+#define MAX6639_REG_DEVID 0x3D
+#define MAX6639_REG_MANUID 0x3E
+#define MAX6639_REG_DEVREV 0x3F
+
+/* Register bits */
+#define MAX6639_GCONFIG_STANDBY 0x80
+#define MAX6639_GCONFIG_POR 0x40
+#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
+#define MAX6639_GCONFIG_CH2_LOCAL 0x10
+#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
+
+#define MAX6639_FAN_CONFIG1_PWM 0x80
+#define MAX6639_FAN_CONFIG3_FREQ_MASK 0x03
+#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
+
+#define MAX6639_NUM_CHANNELS 2
+
+static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
+
+/* Supported PWM frequency */
+static const unsigned int freq_table[] = { 20, 33, 50, 100, 5000, 8333, 12500,
+ 25000 };
+
+#define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \
+ 0 : (rpm_ranges[rpm_range] * 30) / (val))
+#define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255)
+
+/*
+ * Client data (each client gets its own)
+ */
+struct max6639_data {
+ struct regmap *regmap;
+
+ /* Register values initialized only once */
+ u8 ppr[MAX6639_NUM_CHANNELS]; /* Pulses per rotation 0..3 for 1..4 ppr */
+ u8 rpm_range[MAX6639_NUM_CHANNELS]; /* Index in above rpm_ranges table */
+ u32 target_rpm[MAX6639_NUM_CHANNELS];
+
+ /* Optional regulator for FAN supply */
+ struct regulator *reg;
+};
+
+static int max6639_temp_read_input(struct device *dev, int channel, long *temp)
+{
+ u32 regs[2] = { MAX6639_REG_TEMP_EXT(channel), MAX6639_REG_TEMP(channel) };
+ struct max6639_data *data = dev_get_drvdata(dev);
+ u8 regvals[2];
+ int res;
+
+ res = regmap_multi_reg_read(data->regmap, regs, regvals, 2);
+ if (res < 0)
+ return res;
+
+ *temp = ((regvals[0] >> 5) | (regvals[1] << 3)) * 125;
+
+ return 0;
+}
+
+static int max6639_temp_read_fault(struct device *dev, int channel, long *fault)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ unsigned int val;
+ int res;
+
+ res = regmap_read(data->regmap, MAX6639_REG_TEMP_EXT(channel), &val);
+ if (res < 0)
+ return res;
+
+ *fault = val & 1;
+
+ return 0;
+}
+
+static int max6639_temp_read_max(struct device *dev, int channel, long *max)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ unsigned int val;
+ int res;
+
+ res = regmap_read(data->regmap, MAX6639_REG_THERM_LIMIT(channel), &val);
+ if (res < 0)
+ return res;
+
+ *max = (long)val * 1000;
+
+ return 0;
+}
+
+static int max6639_temp_read_crit(struct device *dev, int channel, long *crit)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ unsigned int val;
+ int res;
+
+ res = regmap_read(data->regmap, MAX6639_REG_ALERT_LIMIT(channel), &val);
+ if (res < 0)
+ return res;
+
+ *crit = (long)val * 1000;
+
+ return 0;
+}
+
+static int max6639_temp_read_emergency(struct device *dev, int channel, long *emerg)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ unsigned int val;
+ int res;
+
+ res = regmap_read(data->regmap, MAX6639_REG_OT_LIMIT(channel), &val);
+ if (res < 0)
+ return res;
+
+ *emerg = (long)val * 1000;
+
+ return 0;
+}
+
+static int max6639_get_status(struct device *dev, unsigned int *status)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ unsigned int val;
+ int res;
+
+ res = regmap_read(data->regmap, MAX6639_REG_STATUS, &val);
+ if (res < 0)
+ return res;
+
+ *status = val;
+
+ return 0;
+}
+
+static int max6639_temp_set_max(struct max6639_data *data, int channel, long val)
+{
+ int res;
+
+ res = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(channel),
+ TEMP_LIMIT_TO_REG(val));
+ return res;
+}
+
+static int max6639_temp_set_crit(struct max6639_data *data, int channel, long val)
+{
+ int res;
+
+ res = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(channel), TEMP_LIMIT_TO_REG(val));
+
+ return res;
+}
+
+static int max6639_temp_set_emergency(struct max6639_data *data, int channel, long val)
+{
+ int res;
+
+ res = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(channel), TEMP_LIMIT_TO_REG(val));
+
+ return res;
+}
+
+static int max6639_read_fan(struct device *dev, u32 attr, int channel,
+ long *fan_val)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ unsigned int val;
+ int res;
+
+ switch (attr) {
+ case hwmon_fan_input:
+ res = regmap_read(data->regmap, MAX6639_REG_FAN_CNT(channel), &val);
+ if (res < 0)
+ return res;
+ *fan_val = FAN_FROM_REG(val, data->rpm_range[channel]);
+ return 0;
+ case hwmon_fan_fault:
+ res = max6639_get_status(dev, &val);
+ if (res < 0)
+ return res;
+ *fan_val = !!(val & BIT(1 - channel));
+ return 0;
+ case hwmon_fan_pulses:
+ *fan_val = data->ppr[channel];
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int max6639_set_ppr(struct max6639_data *data, int channel, u8 ppr)
+{
+ /* Decrement the PPR value and shift left by 6 to match the register format */
+ return regmap_write(data->regmap, MAX6639_REG_FAN_PPR(channel), --ppr << 6);
+}
+
+static int max6639_write_fan(struct device *dev, u32 attr, int channel,
+ long val)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ int err;
+
+ switch (attr) {
+ case hwmon_fan_pulses:
+ if (val <= 0 || val > 4)
+ return -EINVAL;
+
+ /* Set Fan pulse per revolution */
+ err = max6639_set_ppr(data, channel, val);
+ if (err < 0)
+ return err;
+ data->ppr[channel] = val;
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static umode_t max6639_fan_is_visible(const void *_data, u32 attr, int channel)
+{
+ switch (attr) {
+ case hwmon_fan_input:
+ case hwmon_fan_fault:
+ return 0444;
+ case hwmon_fan_pulses:
+ return 0644;
+ default:
+ return 0;
+ }
+}
+
+static int max6639_read_pwm(struct device *dev, u32 attr, int channel,
+ long *pwm_val)
+{
+ u32 regs[2] = { MAX6639_REG_FAN_CONFIG3(channel), MAX6639_REG_GCONFIG };
+ struct max6639_data *data = dev_get_drvdata(dev);
+ unsigned int val;
+ u8 regvals[2];
+ int res;
+ u8 i;
+
+ switch (attr) {
+ case hwmon_pwm_input:
+ res = regmap_read(data->regmap, MAX6639_REG_TARGTDUTY(channel), &val);
+ if (res < 0)
+ return res;
+ *pwm_val = val * 255 / 120;
+ return 0;
+ case hwmon_pwm_freq:
+ res = regmap_multi_reg_read(data->regmap, regs, regvals, 2);
+ if (res < 0)
+ return res;
+ i = regvals[0] & MAX6639_FAN_CONFIG3_FREQ_MASK;
+ if (regvals[1] & MAX6639_GCONFIG_PWM_FREQ_HI)
+ i |= 0x4;
+ *pwm_val = freq_table[i];
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int max6639_write_pwm(struct device *dev, u32 attr, int channel,
+ long val)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ int err;
+ u8 i;
+
+ switch (attr) {
+ case hwmon_pwm_input:
+ if (val < 0 || val > 255)
+ return -EINVAL;
+ return regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(channel),
+ val * 120 / 255);
+ case hwmon_pwm_freq:
+ val = clamp_val(val, 0, 25000);
+
+ i = find_closest(val, freq_table, ARRAY_SIZE(freq_table));
+
+ err = regmap_update_bits(data->regmap, MAX6639_REG_FAN_CONFIG3(channel),
+ MAX6639_FAN_CONFIG3_FREQ_MASK, i);
+ if (err < 0)
+ return err;
+
+ if (i >> 2)
+ err = regmap_set_bits(data->regmap, MAX6639_REG_GCONFIG,
+ MAX6639_GCONFIG_PWM_FREQ_HI);
+ else
+ err = regmap_clear_bits(data->regmap, MAX6639_REG_GCONFIG,
+ MAX6639_GCONFIG_PWM_FREQ_HI);
+
+ return err;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static umode_t max6639_pwm_is_visible(const void *_data, u32 attr, int channel)
+{
+ switch (attr) {
+ case hwmon_pwm_input:
+ case hwmon_pwm_freq:
+ return 0644;
+ default:
+ return 0;
+ }
+}
+
+static int max6639_read_temp(struct device *dev, u32 attr, int channel,
+ long *val)
+{
+ unsigned int status;
+ int res;
+
+ switch (attr) {
+ case hwmon_temp_input:
+ res = max6639_temp_read_input(dev, channel, val);
+ return res;
+ case hwmon_temp_fault:
+ res = max6639_temp_read_fault(dev, channel, val);
+ return res;
+ case hwmon_temp_max:
+ res = max6639_temp_read_max(dev, channel, val);
+ return res;
+ case hwmon_temp_crit:
+ res = max6639_temp_read_crit(dev, channel, val);
+ return res;
+ case hwmon_temp_emergency:
+ res = max6639_temp_read_emergency(dev, channel, val);
+ return res;
+ case hwmon_temp_max_alarm:
+ res = max6639_get_status(dev, &status);
+ if (res < 0)
+ return res;
+ *val = !!(status & BIT(3 - channel));
+ return 0;
+ case hwmon_temp_crit_alarm:
+ res = max6639_get_status(dev, &status);
+ if (res < 0)
+ return res;
+ *val = !!(status & BIT(7 - channel));
+ return 0;
+ case hwmon_temp_emergency_alarm:
+ res = max6639_get_status(dev, &status);
+ if (res < 0)
+ return res;
+ *val = !!(status & BIT(5 - channel));
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int max6639_write_temp(struct device *dev, u32 attr, int channel,
+ long val)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+
+ switch (attr) {
+ case hwmon_temp_max:
+ return max6639_temp_set_max(data, channel, val);
+ case hwmon_temp_crit:
+ return max6639_temp_set_crit(data, channel, val);
+ case hwmon_temp_emergency:
+ return max6639_temp_set_emergency(data, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static umode_t max6639_temp_is_visible(const void *_data, u32 attr, int channel)
+{
+ switch (attr) {
+ case hwmon_temp_input:
+ case hwmon_temp_fault:
+ case hwmon_temp_max_alarm:
+ case hwmon_temp_crit_alarm:
+ case hwmon_temp_emergency_alarm:
+ return 0444;
+ case hwmon_temp_max:
+ case hwmon_temp_crit:
+ case hwmon_temp_emergency:
+ return 0644;
+ default:
+ return 0;
+ }
+}
+
+static int max6639_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ switch (type) {
+ case hwmon_fan:
+ return max6639_read_fan(dev, attr, channel, val);
+ case hwmon_pwm:
+ return max6639_read_pwm(dev, attr, channel, val);
+ case hwmon_temp:
+ return max6639_read_temp(dev, attr, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int max6639_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ switch (type) {
+ case hwmon_fan:
+ return max6639_write_fan(dev, attr, channel, val);
+ case hwmon_pwm:
+ return max6639_write_pwm(dev, attr, channel, val);
+ case hwmon_temp:
+ return max6639_write_temp(dev, attr, channel, val);
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static umode_t max6639_is_visible(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ switch (type) {
+ case hwmon_fan:
+ return max6639_fan_is_visible(data, attr, channel);
+ case hwmon_pwm:
+ return max6639_pwm_is_visible(data, attr, channel);
+ case hwmon_temp:
+ return max6639_temp_is_visible(data, attr, channel);
+ default:
+ return 0;
+ }
+}
+
+static const struct hwmon_channel_info * const max6639_info[] = {
+ HWMON_CHANNEL_INFO(fan,
+ HWMON_F_INPUT | HWMON_F_FAULT | HWMON_F_PULSES,
+ HWMON_F_INPUT | HWMON_F_FAULT | HWMON_F_PULSES),
+ HWMON_CHANNEL_INFO(pwm,
+ HWMON_PWM_INPUT | HWMON_PWM_FREQ,
+ HWMON_PWM_INPUT | HWMON_PWM_FREQ),
+ HWMON_CHANNEL_INFO(temp,
+ HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_MAX | HWMON_T_MAX_ALARM |
+ HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY |
+ HWMON_T_EMERGENCY_ALARM,
+ HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_MAX | HWMON_T_MAX_ALARM |
+ HWMON_T_CRIT | HWMON_T_CRIT_ALARM | HWMON_T_EMERGENCY |
+ HWMON_T_EMERGENCY_ALARM),
+ NULL
+};
+
+static const struct hwmon_ops max6639_hwmon_ops = {
+ .is_visible = max6639_is_visible,
+ .read = max6639_read,
+ .write = max6639_write,
+};
+
+static const struct hwmon_chip_info max6639_chip_info = {
+ .ops = &max6639_hwmon_ops,
+ .info = max6639_info,
+};
+
+/*
+ * returns respective index in rpm_ranges table
+ * 1 by default on invalid range
+ */
+static int rpm_range_to_reg(int range)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
+ if (rpm_ranges[i] == range)
+ return i;
+ }
+
+ return 1; /* default: 4000 RPM */
+}
+
+static int max6639_probe_child_from_dt(struct i2c_client *client,
+ struct device_node *child,
+ struct max6639_data *data)
+
+{
+ struct device *dev = &client->dev;
+ u32 i, val;
+ int err;
+
+ err = of_property_read_u32(child, "reg", &i);
+ if (err) {
+ dev_err(dev, "missing reg property of %pOFn\n", child);
+ return err;
+ }
+
+ if (i > 1) {
+ dev_err(dev, "Invalid fan index reg %d\n", i);
+ return -EINVAL;
+ }
+
+ err = of_property_read_u32(child, "pulses-per-revolution", &val);
+ if (!err) {
+ if (val < 1 || val > 4) {
+ dev_err(dev, "invalid pulses-per-revolution %u of %pOFn\n", val, child);
+ return -EINVAL;
+ }
+ data->ppr[i] = val;
+ }
+
+ err = of_property_read_u32(child, "max-rpm", &val);
+ if (!err)
+ data->rpm_range[i] = rpm_range_to_reg(val);
+
+ err = of_property_read_u32(child, "target-rpm", &val);
+ if (!err)
+ data->target_rpm[i] = val;
+
+ return 0;
+}
+
+static int max6639_init_client(struct i2c_client *client,
+ struct max6639_data *data)
+{
+ struct device *dev = &client->dev;
+ const struct device_node *np = dev->of_node;
+ int i, err;
+ u8 target_duty;
+
+ /* Reset chip to default values, see below for GCONFIG setup */
+ err = regmap_write(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_POR);
+ if (err)
+ return err;
+
+ /* Fans pulse per revolution is 2 by default */
+ data->ppr[0] = 2;
+ data->ppr[1] = 2;
+
+ /* default: 4000 RPM */
+ data->rpm_range[0] = 1;
+ data->rpm_range[1] = 1;
+ data->target_rpm[0] = 4000;
+ data->target_rpm[1] = 4000;
+
+ for_each_child_of_node_scoped(np, child) {
+ if (strcmp(child->name, "fan"))
+ continue;
+
+ err = max6639_probe_child_from_dt(client, child, data);
+ if (err)
+ return err;
+ }
+
+ for (i = 0; i < MAX6639_NUM_CHANNELS; i++) {
+ err = regmap_set_bits(data->regmap, MAX6639_REG_OUTPUT_MASK, BIT(1 - i));
+ if (err)
+ return err;
+
+ /* Set Fan pulse per revolution */
+ err = max6639_set_ppr(data, i, data->ppr[i]);
+ if (err)
+ return err;
+
+ /* Fans config PWM, RPM */
+ err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG1(i),
+ MAX6639_FAN_CONFIG1_PWM | data->rpm_range[i]);
+ if (err)
+ return err;
+
+ /* Fans PWM polarity high by default */
+ err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG2a(i), 0x02);
+ if (err)
+ return err;
+
+ /*
+ * /THERM full speed enable,
+ * PWM frequency 25kHz, see also GCONFIG below
+ */
+ err = regmap_write(data->regmap, MAX6639_REG_FAN_CONFIG3(i),
+ MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
+ if (err)
+ return err;
+
+ /* Max. temp. 80C/90C/100C */
+ err = regmap_write(data->regmap, MAX6639_REG_THERM_LIMIT(i), 80);
+ if (err)
+ return err;
+ err = regmap_write(data->regmap, MAX6639_REG_ALERT_LIMIT(i), 90);
+ if (err)
+ return err;
+ err = regmap_write(data->regmap, MAX6639_REG_OT_LIMIT(i), 100);
+ if (err)
+ return err;
+
+ /* Set PWM based on target RPM if specified */
+ if (data->target_rpm[i] > rpm_ranges[data->rpm_range[i]])
+ data->target_rpm[i] = rpm_ranges[data->rpm_range[i]];
+
+ target_duty = 120 * data->target_rpm[i] / rpm_ranges[data->rpm_range[i]];
+ err = regmap_write(data->regmap, MAX6639_REG_TARGTDUTY(i), target_duty);
+ if (err)
+ return err;
+ }
+ /* Start monitoring */
+ return regmap_write(data->regmap, MAX6639_REG_GCONFIG,
+ MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
+ MAX6639_GCONFIG_PWM_FREQ_HI);
+
+}
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int max6639_detect(struct i2c_client *client,
+ struct i2c_board_info *info)
+{
+ struct i2c_adapter *adapter = client->adapter;
+ int dev_id, manu_id;
+
+ if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -ENODEV;
+
+ /* Actual detection via device and manufacturer ID */
+ dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
+ manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
+ if (dev_id != 0x58 || manu_id != 0x4D)
+ return -ENODEV;
+
+ strscpy(info->type, "max6639", I2C_NAME_SIZE);
+
+ return 0;
+}
+
+static void max6639_regulator_disable(void *data)
+{
+ regulator_disable(data);
+}
+
+static bool max6639_regmap_is_volatile(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case MAX6639_REG_TEMP(0):
+ case MAX6639_REG_TEMP_EXT(0):
+ case MAX6639_REG_TEMP(1):
+ case MAX6639_REG_TEMP_EXT(1):
+ case MAX6639_REG_STATUS:
+ case MAX6639_REG_FAN_CNT(0):
+ case MAX6639_REG_FAN_CNT(1):
+ case MAX6639_REG_TARGTDUTY(0):
+ case MAX6639_REG_TARGTDUTY(1):
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config max6639_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = MAX6639_REG_DEVREV,
+ .cache_type = REGCACHE_MAPLE,
+ .volatile_reg = max6639_regmap_is_volatile,
+};
+
+static int max6639_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct max6639_data *data;
+ struct device *hwmon_dev;
+ int err;
+
+ data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->regmap = devm_regmap_init_i2c(client, &max6639_regmap_config);
+ if (IS_ERR(data->regmap))
+ return dev_err_probe(dev,
+ PTR_ERR(data->regmap),
+ "regmap initialization failed\n");
+
+ data->reg = devm_regulator_get_optional(dev, "fan");
+ if (IS_ERR(data->reg)) {
+ if (PTR_ERR(data->reg) != -ENODEV)
+ return PTR_ERR(data->reg);
+
+ data->reg = NULL;
+ } else {
+ /* Spin up fans */
+ err = regulator_enable(data->reg);
+ if (err) {
+ dev_err(dev, "Failed to enable fan supply: %d\n", err);
+ return err;
+ }
+ err = devm_add_action_or_reset(dev, max6639_regulator_disable,
+ data->reg);
+ if (err) {
+ dev_err(dev, "Failed to register action: %d\n", err);
+ return err;
+ }
+ }
+
+ /* Initialize the max6639 chip */
+ err = max6639_init_client(client, data);
+ if (err < 0)
+ return err;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
+ data, &max6639_chip_info,
+ NULL);
+
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static int max6639_suspend(struct device *dev)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+
+ if (data->reg)
+ regulator_disable(data->reg);
+
+ return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY,
+ MAX6639_GCONFIG_STANDBY);
+}
+
+static int max6639_resume(struct device *dev)
+{
+ struct max6639_data *data = dev_get_drvdata(dev);
+ int ret;
+
+ if (data->reg) {
+ ret = regulator_enable(data->reg);
+ if (ret) {
+ dev_err(dev, "Failed to enable fan supply: %d\n", ret);
+ return ret;
+ }
+ }
+
+ return regmap_write_bits(data->regmap, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_STANDBY,
+ ~MAX6639_GCONFIG_STANDBY);
+}
+
+static const struct i2c_device_id max6639_id[] = {
+ { .name = "max6639" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, max6639_id);
+
+static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);
+
+static const struct of_device_id max6639_of_match[] = {
+ { .compatible = "maxim,max6639", },
+ { },
+};
+
+static struct i2c_driver max6639_driver = {
+ .class = I2C_CLASS_HWMON,
+ .driver = {
+ .name = "max6639",
+ .pm = pm_sleep_ptr(&max6639_pm_ops),
+ .of_match_table = max6639_of_match,
+ },
+ .probe = max6639_probe,
+ .id_table = max6639_id,
+ .detect = max6639_detect,
+ .address_list = normal_i2c,
+};
+
+module_i2c_driver(max6639_driver);
+
+MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
+MODULE_DESCRIPTION("max6639 driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.3.1 (git 2.54.0) at 2026-10-29 07:27:26 +0000