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hwmon: (adt7475) Add support for configuring initial PWM state
By default the PWM duty cycle in hardware is 100%. On some systems this can cause unwanted fan noise. Add the ability to specify the fan connections and initial state of the PWMs via device properties. Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Link: https://lore.kernel.org/r/20240722221737.3407958-4-chris.packham@alliedtelesis.co.nz [groeck: Cleaned up formatting] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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@ -21,6 +21,8 @@
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#include <linux/of.h>
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#include <linux/util_macros.h>
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#include <dt-bindings/pwm/pwm.h>
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/* Indexes for the sysfs hooks */
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#define INPUT 0
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@ -1662,6 +1664,130 @@ static int adt7475_set_pwm_polarity(struct i2c_client *client)
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return 0;
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}
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struct adt7475_pwm_config {
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int index;
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int freq;
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int flags;
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int duty;
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};
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static int _adt7475_pwm_properties_parse_args(u32 args[4], struct adt7475_pwm_config *cfg)
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{
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int freq_hz;
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int duty;
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if (args[1] == 0)
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return -EINVAL;
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freq_hz = 1000000000UL / args[1];
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if (args[3] >= args[1])
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duty = 255;
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else
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duty = div_u64(255ULL * args[3], args[1]);
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cfg->index = args[0];
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cfg->freq = find_closest(freq_hz, pwmfreq_table, ARRAY_SIZE(pwmfreq_table));
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cfg->flags = args[2];
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cfg->duty = duty;
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return 0;
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}
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static int adt7475_pwm_properties_parse_reference_args(struct fwnode_handle *fwnode,
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struct adt7475_pwm_config *cfg)
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{
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int ret, i;
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struct fwnode_reference_args rargs = {};
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u32 args[4] = {};
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ret = fwnode_property_get_reference_args(fwnode, "pwms", "#pwm-cells", 0, 0, &rargs);
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if (ret)
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return ret;
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if (rargs.nargs != 4) {
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fwnode_handle_put(rargs.fwnode);
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return -EINVAL;
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}
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for (i = 0; i < 4; i++)
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args[i] = rargs.args[i];
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ret = _adt7475_pwm_properties_parse_args(args, cfg);
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fwnode_handle_put(rargs.fwnode);
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return ret;
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}
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static int adt7475_pwm_properties_parse_args(struct fwnode_handle *fwnode,
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struct adt7475_pwm_config *cfg)
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{
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int ret;
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u32 args[4] = {};
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ret = fwnode_property_read_u32_array(fwnode, "pwms", args, ARRAY_SIZE(args));
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if (ret)
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return ret;
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return _adt7475_pwm_properties_parse_args(args, cfg);
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}
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static int adt7475_fan_pwm_config(struct i2c_client *client)
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{
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struct adt7475_data *data = i2c_get_clientdata(client);
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struct fwnode_handle *child;
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struct adt7475_pwm_config cfg = {};
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int ret;
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device_for_each_child_node(&client->dev, child) {
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if (!fwnode_property_present(child, "pwms"))
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continue;
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if (is_of_node(child))
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ret = adt7475_pwm_properties_parse_reference_args(child, &cfg);
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else
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ret = adt7475_pwm_properties_parse_args(child, &cfg);
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if (cfg.index >= ADT7475_PWM_COUNT)
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return -EINVAL;
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ret = adt7475_read(PWM_CONFIG_REG(cfg.index));
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if (ret < 0)
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return ret;
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data->pwm[CONTROL][cfg.index] = ret;
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if (cfg.flags & PWM_POLARITY_INVERTED)
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data->pwm[CONTROL][cfg.index] |= BIT(4);
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else
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data->pwm[CONTROL][cfg.index] &= ~BIT(4);
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/* Force to manual mode so PWM values take effect */
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data->pwm[CONTROL][cfg.index] &= ~0xE0;
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data->pwm[CONTROL][cfg.index] |= 0x07 << 5;
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ret = i2c_smbus_write_byte_data(client, PWM_CONFIG_REG(cfg.index),
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data->pwm[CONTROL][cfg.index]);
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if (ret)
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return ret;
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data->pwm[INPUT][cfg.index] = cfg.duty;
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ret = i2c_smbus_write_byte_data(client, PWM_REG(cfg.index),
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data->pwm[INPUT][cfg.index]);
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if (ret)
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return ret;
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data->range[cfg.index] = adt7475_read(TEMP_TRANGE_REG(cfg.index));
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data->range[cfg.index] &= ~0xf;
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data->range[cfg.index] |= cfg.freq;
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ret = i2c_smbus_write_byte_data(client, TEMP_TRANGE_REG(cfg.index),
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data->range[cfg.index]);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int adt7475_probe(struct i2c_client *client)
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{
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enum chips chip;
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@ -1774,6 +1900,10 @@ static int adt7475_probe(struct i2c_client *client)
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if (ret && ret != -EINVAL)
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dev_warn(&client->dev, "Error configuring pwm polarity\n");
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ret = adt7475_fan_pwm_config(client);
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if (ret)
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dev_warn(&client->dev, "Error %d configuring fan/pwm\n", ret);
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/* Start monitoring */
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switch (chip) {
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case adt7475:
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