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Fri, 12 Jul 2024 11:46:16 +1200 Received: from chrisp-dl.ws.atlnz.lc (chrisp-dl.ws.atlnz.lc [10.33.22.30]) by pat.atlnz.lc (Postfix) with ESMTP id 46E6113EE5B; Fri, 12 Jul 2024 11:46:16 +1200 (NZST) Received: by chrisp-dl.ws.atlnz.lc (Postfix, from userid 1030) id 442A32809DC; Fri, 12 Jul 2024 11:46:16 +1200 (NZST) From: Chris Packham To: jdelvare@suse.com, linux@roeck-us.net, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, ukleinek@kernel.org Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, Chris Packham Subject: [PATCH v5 3/3] hwmon: (adt7475) Add support for configuring initial PWM state Date: Fri, 12 Jul 2024 11:46:14 +1200 Message-ID: <20240711234614.3104839-4-chris.packham@alliedtelesis.co.nz> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240711234614.3104839-1-chris.packham@alliedtelesis.co.nz> References: <20240711234614.3104839-1-chris.packham@alliedtelesis.co.nz> Precedence: bulk X-Mailing-List: linux-pwm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SEG-SpamProfiler-Analysis: v=2.4 cv=PIKs+uqC c=1 sm=1 tr=0 ts=66906ec8 a=KLBiSEs5mFS1a/PbTCJxuA==:117 a=4kmOji7k6h8A:10 a=cN3pOM3YZmoqkZYst0EA:9 a=3ZKOabzyN94A:10 X-SEG-SpamProfiler-Score: 0 x-atlnz-ls: pat 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 --- Notes: Changes in v5: - Deal with PWM frequency and duty cycle being specified in nanoseconds Changes in v4: - Support DT and ACPI fwnodes - Put PWM into manual mode Changes in v3: - Use the pwm provider/consumer bindings Changes in v2: - Use correct device property string for frequency - Allow -EINVAL and only warn on error - Use a frequency of 0 to indicate that the hardware should be left as-is drivers/hwmon/adt7475.c | 122 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c index 4224ffb30483..5edf423bcb6c 100644 --- a/drivers/hwmon/adt7475.c +++ b/drivers/hwmon/adt7475.c @@ -21,6 +21,8 @@ #include #include +#include + /* Indexes for the sysfs hooks */ #define INPUT 0 @@ -1662,6 +1664,122 @@ static int adt7475_set_pwm_polarity(struct i2c_client *client) return 0; } +struct adt7475_pwm_config { + int index; + int freq; + int flags; + int duty; +}; + +static int adt7475_pwm_properties_parse_reference_args(struct fwnode_handle *fwnode, + struct adt7475_pwm_config *cfg) +{ + int ret; + struct fwnode_reference_args args = {}; + int freq_hz; + int duty; + + ret = fwnode_property_get_reference_args(fwnode, "pwms", "#pwm-cells", 0, 0, &args); + if (ret) + return ret; + + if (args.nargs != 4) { + fwnode_handle_put(args.fwnode); + return -EINVAL; + } + + freq_hz = 1000000000UL / args.args[1]; + duty = 255 / (args.args[1] / args.args[3]); + + cfg->index = args.args[0]; + cfg->freq = find_closest(freq_hz, pwmfreq_table, ARRAY_SIZE(pwmfreq_table)); + cfg->flags = args.args[2]; + cfg->duty = clamp_val(duty, 0, 0xFF); + + fwnode_handle_put(args.fwnode); + + return 0; +} + +static int adt7475_pwm_properties_parse_args(struct fwnode_handle *fwnode, + struct adt7475_pwm_config *cfg) +{ + int ret; + u32 args[4] = {}; + int freq_hz; + int duty; + + ret = fwnode_property_read_u32_array(fwnode, "pwms", args, ARRAY_SIZE(args)); + if (ret) + return ret; + + freq_hz = 1000000000UL / args[1]; + duty = 255 / (args[1] / args[3]); + + cfg->index = args[0]; + cfg->freq = find_closest(freq_hz, pwmfreq_table, ARRAY_SIZE(pwmfreq_table)); + cfg->flags = args[2]; + cfg->duty = clamp_val(duty, 0, 0xFF); + + return 0; +} + +static int adt7475_fan_pwm_config(struct i2c_client *client) +{ + struct adt7475_data *data = i2c_get_clientdata(client); + struct fwnode_handle *child; + struct adt7475_pwm_config cfg = {}; + int ret; + + device_for_each_child_node(&client->dev, child) { + if (!fwnode_property_present(child, "pwms")) + continue; + + if (is_of_node(child)) + ret = adt7475_pwm_properties_parse_reference_args(child, &cfg); + else + ret = adt7475_pwm_properties_parse_args(child, &cfg); + + if (cfg.index >= ADT7475_PWM_COUNT) + return -EINVAL; + + ret = adt7475_read(PWM_CONFIG_REG(cfg.index)); + if (ret < 0) + return ret; + data->pwm[CONTROL][cfg.index] = ret; + if (cfg.flags & PWM_POLARITY_INVERTED) + data->pwm[CONTROL][cfg.index] |= BIT(4); + else + data->pwm[CONTROL][cfg.index] &= ~BIT(4); + + /* Force to manual mode so PWM values take effect */ + data->pwm[CONTROL][cfg.index] &= ~0xE0; + data->pwm[CONTROL][cfg.index] |= 0x07 << 5; + + ret = i2c_smbus_write_byte_data(client, PWM_CONFIG_REG(cfg.index), + data->pwm[CONTROL][cfg.index]); + if (ret) + return ret; + + data->pwm[INPUT][cfg.index] = cfg.duty; + ret = i2c_smbus_write_byte_data(client, PWM_REG(cfg.index), + data->pwm[INPUT][cfg.index]); + if (ret) + return ret; + + data->range[cfg.index] = adt7475_read(TEMP_TRANGE_REG(cfg.index)); + data->range[cfg.index] &= ~0xf; + data->range[cfg.index] |= cfg.freq; + + ret = i2c_smbus_write_byte_data(client, TEMP_TRANGE_REG(cfg.index), + data->range[cfg.index]); + if (ret) + return ret; + } + + return 0; +} + static int adt7475_probe(struct i2c_client *client) { enum chips chip; @@ -1778,6 +1896,10 @@ static int adt7475_probe(struct i2c_client *client) if (ret && ret != -EINVAL) dev_warn(&client->dev, "Error configuring pwm polarity\n"); + ret = adt7475_fan_pwm_config(client); + if (ret) + dev_warn(&client->dev, "Error %d configuring fan/pwm\n", ret); + /* Start monitoring */ switch (chip) { case adt7475: