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[78.94.0.51]) by smtp.gmail.com with ESMTPSA id e10-20020adf9bca000000b003143cb109d5sm7418185wrc.14.2023.09.11.04.36.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Sep 2023 04:36:52 -0700 (PDT) From: Naresh Solanki To: broonie@kernel.org, zev@bewilderbeest.net, Liam Girdwood , Jean Delvare , Guenter Roeck Cc: Naresh Solanki , linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org Subject: [PATCH v3] regulator (max5970): Add hwmon support Date: Mon, 11 Sep 2023 13:36:47 +0200 Message-ID: <20230911113647.1259204-1-naresh.solanki@9elements.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Utilize the integrated 10-bit ADC in Max5970/Max5978 to enable voltage and current monitoring. This feature is seamlessly integrated through the hwmon subsystem. Signed-off-by: Naresh Solanki --- Changes in V3: - Update signed-off - Add break - Update hwmon dev register name to max5970 - Remove changes in Kconfig. Changes in V2: - default case added for switch statement - Add dependency on HWMON --- drivers/regulator/max5970-regulator.c | 126 ++++++++++++++++++++++++++ 1 file changed, 126 insertions(+) diff --git a/drivers/regulator/max5970-regulator.c b/drivers/regulator/max5= 970-regulator.c index b56a174cde3d..208de66c0928 100644 --- a/drivers/regulator/max5970-regulator.c +++ b/drivers/regulator/max5970-regulator.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include #include @@ -32,6 +33,121 @@ enum max597x_regulator_id { MAX597X_SW1, }; =20 +static int max5970_read_adc(struct regmap *regmap, int reg, long *val) +{ + u8 reg_data[2]; + int ret; + + ret =3D regmap_bulk_read(regmap, reg, ®_data[0], 2); + if (ret < 0) + return ret; + + *val =3D (reg_data[0] << 2) | (reg_data[1] & 3); + + return 0; +} + +static int max5970_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct max5970_data *ddata =3D dev_get_drvdata(dev); + struct regmap *regmap =3D dev_get_regmap(dev->parent, NULL); + int ret; + + switch (type) { + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + ret =3D max5970_read_adc(regmap, MAX5970_REG_CURRENT_H(channel), val); + /* + * Calculate current from ADC value, IRNG range & shunt resistor value. + * ddata->irng holds the voltage corresponding to the maximum value the + * 10-bit ADC can measure. + * To obtain the output, multiply the ADC value by the IRNG range (in + * millivolts) and then divide it by the maximum value of the 10-bit AD= C. + */ + *val =3D (*val * ddata->irng[channel]) >> 10; + /* Convert the voltage meansurement across shunt resistor to current */ + *val =3D (*val * 1000) / ddata->shunt_micro_ohms[channel]; + return ret; + default: + return -EOPNOTSUPP; + } + + case hwmon_in: + switch (attr) { + case hwmon_in_input: + ret =3D max5970_read_adc(regmap, MAX5970_REG_VOLTAGE_H(channel), val); + /* + * Calculate voltage from ADC value and MON range. + * ddata->mon_rng holds the voltage corresponding to the maximum value = the + * 10-bit ADC can measure. + * To obtain the output, multiply the ADC value by the MON range (in + * microvolts) and then divide it by the maximum value of the 10-bit AD= C. + */ + *val =3D mul_u64_u32_shr(*val, ddata->mon_rng[channel], 10); + /* uV to mV */ + *val =3D *val / 1000; + return ret; + default: + return -EOPNOTSUPP; + } + default: + return -EOPNOTSUPP; + } +} + +static umode_t max5970_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + struct max5970_data *ddata =3D (struct max5970_data *)data; + + if (channel >=3D ddata->num_switches) + return 0; + + switch (type) { + case hwmon_in: + switch (attr) { + case hwmon_in_input: + return 0444; + default: + break; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + /* Current measurement requires knowledge of the shunt resistor value. = */ + if (ddata->shunt_micro_ohms[channel]) + return 0444; + break; + default: + break; + } + break; + default: + break; + } + return 0; +} + +static const struct hwmon_ops max5970_hwmon_ops =3D { + .is_visible =3D max5970_is_visible, + .read =3D max5970_read, +}; + +static const struct hwmon_channel_info *max5970_info[] =3D { + HWMON_CHANNEL_INFO(in, HWMON_I_INPUT, HWMON_I_INPUT), + HWMON_CHANNEL_INFO(curr, HWMON_C_INPUT, HWMON_C_INPUT), + NULL +}; + +static const struct hwmon_chip_info max5970_chip_info =3D { + .ops =3D &max5970_hwmon_ops, + .info =3D max5970_info, +}; + static int max597x_uvp_ovp_check_mode(struct regulator_dev *rdev, int seve= rity) { int ret, reg; @@ -432,6 +548,7 @@ static int max597x_regulator_probe(struct platform_devi= ce *pdev) struct regulator_config config =3D { }; struct regulator_dev *rdev; struct regulator_dev *rdevs[MAX5970_NUM_SWITCHES]; + struct device *hwmon_dev; int num_switches; int ret, i; =20 @@ -485,6 +602,15 @@ static int max597x_regulator_probe(struct platform_dev= ice *pdev) max597x->shunt_micro_ohms[i] =3D data->shunt_micro_ohms; } =20 + if (IS_ENABLED(CONFIG_HWMON)) { + hwmon_dev =3D devm_hwmon_device_register_with_info(&i2c->dev, "max5970",= max597x, + &max5970_chip_info, NULL); + if (IS_ERR(hwmon_dev)) { + return dev_err_probe(&i2c->dev, PTR_ERR(hwmon_dev), + "Unable to register hwmon device\n"); + } + } + if (i2c->irq) { ret =3D max597x_setup_irq(&i2c->dev, i2c->irq, rdevs, num_switches, base-commit: 41f02a383ac652f1a0b5538c5901b7ec93e37290 --=20 2.41.0