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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id c18-20020aa7d612000000b0045720965c7asm7670385edr.11.2022.10.10.13.31.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 10 Oct 2022 13:31:29 -0700 (PDT) From: Naresh Solanki X-Google-Original-From: Naresh Solanki To: devicetree@vger.kernel.org, Guenter Roeck , Jean Delvare Cc: linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org, Patrick Rudolph , Marcello Sylvester Bauer , Naresh Solanki Subject: [PATCH 3/3] hwmon: (max6639) Change from pdata to dt configuration Date: Mon, 10 Oct 2022 22:30:46 +0200 Message-Id: <20221010203046.3673663-4-Naresh.Solanki@9elements.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221010203046.3673663-1-Naresh.Solanki@9elements.com> References: <20221010203046.3673663-1-Naresh.Solanki@9elements.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org From: Marcello Sylvester Bauer max6639_platform_data is not used by any in-kernel driver and does not address the MAX6639 channels separately. Move to device tree configuration with explicit properties to configure each channel. Non-DT platform can still use this module with its default configuration. Signed-off-by: Marcello Sylvester Bauer Signed-off-by: Naresh Solanki --- drivers/hwmon/max6639.c | 251 +++++++++++++++++++------- include/linux/platform_data/max6639.h | 15 -- 2 files changed, 188 insertions(+), 78 deletions(-) delete mode 100644 include/linux/platform_data/max6639.h diff --git a/drivers/hwmon/max6639.c b/drivers/hwmon/max6639.c index 9b895402c80d..cbe3c5dc7e4b 100644 --- a/drivers/hwmon/max6639.c +++ b/drivers/hwmon/max6639.c @@ -19,48 +19,53 @@ #include #include #include -#include /* 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_STATUS 0x02 #define MAX6639_REG_OUTPUT_MASK 0x03 -#define MAX6639_REG_GCONFIG 0x04 +#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_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 +#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_REG_OUTPUT_MASK_OT(x, ch) (x << (5 - ch)) +#define MAX6639_REG_OUTPUT_MASK_THERM(x, ch) (x << (3 - ch)) +#define MAX6639_REG_OUTPUT_MASK_FANFAIL(x, ch) (x << (1 - ch)) #define MAX6639_GCONFIG_STANDBY 0x80 -#define MAX6639_GCONFIG_POR 0x40 -#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20 +#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_THERM_FULL_SPEED 0x40 +#define MAX6639_FAN_CONFIG3_SPIN_UP_DISABLE 0x80 #define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40 static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; #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) /* @@ -69,7 +74,7 @@ static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 }; struct max6639_data { struct i2c_client *client; struct mutex update_lock; - bool valid; /* true if following fields are valid */ + char valid; /* !=0 if following fields are valid */ unsigned long last_updated; /* In jiffies */ /* Register values sampled regularly */ @@ -85,9 +90,14 @@ struct max6639_data { u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */ /* Register values initialized only once */ - u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */ - u8 rpm_range; /* Index in above rpm_ranges table */ - + u8 ppr[2]; /* Pulses per rotation 0..3 for 1..4 ppr */ + u8 rpm_range[2]; /* Index in above rpm_ranges table */ + u8 pwm_polarity[2]; /* Fans PWM polarity, 0..1 */ + bool full_speed_on_therm[2]; /* disable THERM full speed assertion */ + bool spin_up_enable[2]; /* Enable fan spin-up if fan is not spinning */ + bool ot_indication[2]; /* Enable OT pin indication */ + bool therm_indication[2]; /* Enable THERM pin indication */ + bool fan_fail_indication[2]; /* Enable FANFAIL pin indication */ /* Optional regulator for FAN supply */ struct regulator *reg; }; @@ -144,7 +154,7 @@ static struct max6639_data *max6639_update_device(struct device *dev) } data->last_updated = jiffies; - data->valid = true; + data->valid = 1; } abort: mutex_unlock(&data->update_lock); @@ -319,7 +329,7 @@ static ssize_t fan_input_show(struct device *dev, return PTR_ERR(data); return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index], - data->rpm_range)); + data->rpm_range[attr->index])); } static ssize_t alarm_show(struct device *dev, @@ -386,28 +396,26 @@ static struct attribute *max6639_attrs[] = { ATTRIBUTE_GROUPS(max6639); /* - * returns respective index in rpm_ranges table - * 1 by default on invalid range + * Get respective index in rpm_ranges table */ -static int rpm_range_to_reg(int range) +static int rpm_range_to_index(u8 *index, int range) { int i; for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) { - if (rpm_ranges[i] == range) - return i; + if (range <= rpm_ranges[i]) + break; } - return 1; /* default: 4000 RPM */ + // If provided RPM is more than 16000 RPM then select 16000 RPM. + *index = i; + return 0; } static int max6639_init_client(struct i2c_client *client, struct max6639_data *data) { - struct max6639_platform_data *max6639_info = - dev_get_platdata(&client->dev); - int i; - int rpm_range = 1; /* default: 4000 RPM */ + int i, val; int err; /* Reset chip to default values, see below for GCONFIG setup */ @@ -416,58 +424,40 @@ static int max6639_init_client(struct i2c_client *client, if (err) goto exit; - /* Fans pulse per revolution is 2 by default */ - if (max6639_info && max6639_info->ppr > 0 && - max6639_info->ppr < 5) - data->ppr = max6639_info->ppr; - else - data->ppr = 2; - data->ppr -= 1; - - if (max6639_info) - rpm_range = rpm_range_to_reg(max6639_info->rpm_range); - data->rpm_range = rpm_range; - for (i = 0; i < 2; i++) { /* Set Fan pulse per revolution */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_FAN_PPR(i), - data->ppr << 6); + data->ppr[i] << 6); if (err) goto exit; /* Fans config PWM, RPM */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_FAN_CONFIG1(i), - MAX6639_FAN_CONFIG1_PWM | rpm_range); + MAX6639_FAN_CONFIG1_PWM | data->rpm_range[i]); if (err) goto exit; - /* Fans PWM polarity high by default */ - if (max6639_info && max6639_info->pwm_polarity == 0) - err = i2c_smbus_write_byte_data(client, - MAX6639_REG_FAN_CONFIG2a(i), 0x00); - else - err = i2c_smbus_write_byte_data(client, - MAX6639_REG_FAN_CONFIG2a(i), 0x02); - if (err) - goto exit; + /* Fans PWM polarity */ + err = i2c_smbus_write_byte_data(client, + MAX6639_REG_FAN_CONFIG2a(i), data->pwm_polarity[i] ? 0x00 : 0x02); /* - * /THERM full speed enable, + * Full speed on therm, spin-up at zero rpm. * PWM frequency 25kHz, see also GCONFIG below */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_FAN_CONFIG3(i), - MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03); + (data->full_speed_on_therm[i] ? + MAX6639_FAN_CONFIG3_THERM_FULL_SPEED : 0) | + (data->spin_up_enable[i] ? + 0 : MAX6639_FAN_CONFIG3_SPIN_UP_DISABLE) | 0x03); + if (err) goto exit; - /* Max. temp. 80C/90C/100C */ - data->temp_therm[i] = 80; - data->temp_alert[i] = 90; - data->temp_ot[i] = 100; err = i2c_smbus_write_byte_data(client, MAX6639_REG_THERM_LIMIT(i), data->temp_therm[i]); @@ -483,13 +473,24 @@ static int max6639_init_client(struct i2c_client *client, if (err) goto exit; - /* PWM 120/120 (i.e. 100%) */ - data->pwm[i] = 120; err = i2c_smbus_write_byte_data(client, MAX6639_REG_TARGTDUTY(i), data->pwm[i]); if (err) goto exit; } + + val = 0; + for (i = 0; i < 2; i++) { + val |= MAX6639_REG_OUTPUT_MASK_OT( + data->ot_indication[i], i); + val |= MAX6639_REG_OUTPUT_MASK_THERM( + data->therm_indication[i], i); + val |= MAX6639_REG_OUTPUT_MASK_FANFAIL( + data->fan_fail_indication[i], i); + } + /* Configure output mask register */ + err = i2c_smbus_write_byte_data(client, MAX6639_REG_OUTPUT_MASK, val); + /* Start monitoring */ err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL | @@ -524,12 +525,104 @@ static void max6639_regulator_disable(void *data) regulator_disable(data); } +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 >= 2) { + dev_err(dev, "invalid reg %d of %pOFn\n", i, child); + return -EINVAL; + } + + err = of_property_read_u32(child, "pulses-per-revolution", &val); + if (err) { + dev_err(dev, "missing pulses-per-revolution property of %pOFn\n", child); + return err; + } + + if (val < 0 || val > 5) { + dev_err(dev, "invalid pulses-per-revolution %d of %pOFn\n", val, child); + return -EINVAL; + } + data->ppr[i] = val; + + err = of_property_read_u32(child, "max-rpm", &val); + if (err) { + dev_err(dev, "missing rpm-range property of %pOFn\n", child); + return err; + } + + err = rpm_range_to_index(&data->rpm_range[i], val); + if (err) { + dev_err(dev, "invalid rpm-range %d of %pOFn\n", val, child); + return err; + } + + data->pwm_polarity[i] = of_property_read_bool(child, "pwm-polarity-inverse"); + + err = of_property_read_u32(child, "target-rpm", &val); + /* Convert to PWM from provided target RPM */ + if (!err && val != 0) + data->pwm[i] = + (u8)(val * 255 / rpm_ranges[data->rpm_range[i]]); + + data->spin_up_enable[i] = of_property_read_bool(child, "maxim,fan-spin-up"); + + data->full_speed_on_therm[i] = of_property_read_bool(child, + "maxim,full-speed-on-therm"); + + data->fan_fail_indication[i] = of_property_read_bool(child, "maxim,fanfail_indication"); + + return 0; +} + +static int max6639_probe_from_dt(struct i2c_client *client, struct max6639_data *data) +{ + struct device *dev = &client->dev; + const struct device_node *np = dev->of_node; + struct device_node *child; + int err; + + /* Compatible with non-DT platforms */ + if (!np) + return 0; + + for_each_child_of_node(np, child) { + if (strcmp(child->name, "fan")) + continue; + + err = max6639_probe_child_from_dt(client, child, data); + if (err) { + of_node_put(child); + return err; + } + } + + data->ot_indication[0] = !of_property_read_bool(np, "ot0_indication"); + data->ot_indication[1] = !of_property_read_bool(np, "ot1_indication"); + data->therm_indication[0] = !of_property_read_bool(np, "therm0_indication"); + data->therm_indication[1] = !of_property_read_bool(np, "therm1_indication"); + + return 0; +} + static int max6639_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct max6639_data *data; struct device *hwmon_dev; - int err; + int err, i; data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL); if (!data) @@ -539,9 +632,11 @@ static int max6639_probe(struct i2c_client *client) data->reg = devm_regulator_get_optional(dev, "fan"); if (IS_ERR(data->reg)) { - if (PTR_ERR(data->reg) != -ENODEV) - return PTR_ERR(data->reg); - + if (PTR_ERR(data->reg) != -ENODEV) { + err = (int)PTR_ERR(data->reg); + dev_warn(dev, "Failed looking up fan supply: %d\n", err); + return err; + } data->reg = NULL; } else { /* Spin up fans */ @@ -560,6 +655,25 @@ static int max6639_probe(struct i2c_client *client) mutex_init(&data->update_lock); + /* default values */ + for (i = 0; i < 2; i++) { + /* 4000 RPM */ + data->rpm_range[i] = 1; + data->ppr[i] = 2; + data->pwm_polarity[i] = 1; + /* Max. temp. 80C/90C/100C */ + data->temp_therm[i] = 80; + data->temp_alert[i] = 90; + data->temp_ot[i] = 100; + /* PWM 120/120 (i.e. 100%) */ + data->pwm[i] = 120; + data->full_speed_on_therm[i] = false; + } + + err = max6639_probe_from_dt(client, data); + if (err) + return err; + /* Initialize the max6639 chip */ err = max6639_init_client(client, data); if (err < 0) @@ -571,6 +685,7 @@ static int max6639_probe(struct i2c_client *client) return PTR_ERR_OR_ZERO(hwmon_dev); } +#if IS_ENABLED(CONFIG_PM_SLEEP) static int max6639_suspend(struct device *dev) { struct i2c_client *client = to_i2c_client(dev); @@ -608,6 +723,7 @@ static int max6639_resume(struct device *dev) return i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG, ret & ~MAX6639_GCONFIG_STANDBY); } +#endif static const struct i2c_device_id max6639_id[] = { {"max6639", 0}, @@ -616,13 +732,22 @@ static const struct i2c_device_id max6639_id[] = { MODULE_DEVICE_TABLE(i2c, max6639_id); -static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); +#ifdef CONFIG_OF +static const struct of_device_id maxim_of_platform_match[] = { + {.compatible = "maxim,max6639"}, + {}, +}; +MODULE_DEVICE_TABLE(of, maxim_of_platform_match); +#endif + +static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume); static struct i2c_driver max6639_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "max6639", .pm = pm_sleep_ptr(&max6639_pm_ops), + .of_match_table = of_match_ptr(maxim_of_platform_match), }, .probe_new = max6639_probe, .id_table = max6639_id, diff --git a/include/linux/platform_data/max6639.h b/include/linux/platform_data/max6639.h deleted file mode 100644 index 65bfdb4fdc15..000000000000 --- a/include/linux/platform_data/max6639.h +++ /dev/null @@ -1,15 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef _LINUX_MAX6639_H -#define _LINUX_MAX6639_H - -#include - -/* platform data for the MAX6639 temperature sensor and fan control */ - -struct max6639_platform_data { - bool pwm_polarity; /* Polarity low (0) or high (1, default) */ - int ppr; /* Pulses per rotation 1..4 (default == 2) */ - int rpm_range; /* 2000, 4000 (default), 8000 or 16000 */ -}; - -#endif /* _LINUX_MAX6639_H */