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([115.96.68.45]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2b24268e7f5sm42266995ad.35.2026.03.29.00.34.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 29 Mar 2026 00:34:19 -0700 (PDT) From: Tabrez Ahmed To: linux@roeck-us.net Cc: linux-hwmon@vger.kernel.org, linux-kernel@vger.kernel.org, shuah@kernel.org, me@brighamcampbell.com, Tabrez Ahmed Subject: [PATCH v2 1/2] hwmon: (ads7871) Convert to hwmon_device_register_with_info Date: Sun, 29 Mar 2026 13:03:51 +0530 Message-ID: <20260329073352.270451-2-tabreztalks@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260329073352.270451-1-tabreztalks@gmail.com> References: <20260329073352.270451-1-tabreztalks@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Convert the ads7871 driver from the legacy hwmon_device_register() to the modern hwmon_device_register_with_info() API. This migration simplifies the driver by using the structured hwmon_channel_info approach and prepares the codebase for the transition to a shared DMA-safe buffer. Signed-off-by: Tabrez Ahmed --- drivers/hwmon/ads7871.c | 76 ++++++++++++++++++++++------------------- 1 file changed, 41 insertions(+), 35 deletions(-) diff --git a/drivers/hwmon/ads7871.c b/drivers/hwmon/ads7871.c index 9bfdf9e6bcd77..41a1e9bbd4050 100644 --- a/drivers/hwmon/ads7871.c +++ b/drivers/hwmon/ads7871.c @@ -56,7 +56,6 @@ #include #include #include -#include #include #include @@ -65,10 +64,20 @@ struct ads7871_data { struct spi_device *spi; }; +static umode_t ads7871_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + if (type == hwmon_in && attr == hwmon_in_input) + return 0444; + + return 0; +} static int ads7871_read_reg8(struct spi_device *spi, int reg) { int ret; + reg = reg | INST_READ_BM; ret = spi_w8r8(spi, reg); return ret; @@ -77,6 +86,7 @@ static int ads7871_read_reg8(struct spi_device *spi, int reg) static int ads7871_read_reg16(struct spi_device *spi, int reg) { int ret; + reg = reg | INST_READ_BM | INST_16BIT_BM; ret = spi_w8r16(spi, reg); return ret; @@ -85,19 +95,20 @@ static int ads7871_read_reg16(struct spi_device *spi, int reg) static int ads7871_write_reg8(struct spi_device *spi, int reg, u8 val) { u8 tmp[2] = {reg, val}; + return spi_write(spi, tmp, sizeof(tmp)); } -static ssize_t voltage_show(struct device *dev, struct device_attribute *da, - char *buf) +static int ads7871_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) { struct ads7871_data *pdata = dev_get_drvdata(dev); struct spi_device *spi = pdata->spi; - struct sensor_device_attribute *attr = to_sensor_dev_attr(da); - int ret, val, i = 0; - uint8_t channel, mux_cnv; + int ret, raw_val, i = 0; + uint8_t mux_cnv; - channel = attr->index; + if (type != hwmon_in || attr != hwmon_in_input) + return -EOPNOTSUPP; /* * TODO: add support for conversions * other than single ended with a gain of 1 @@ -127,39 +138,34 @@ static ssize_t voltage_show(struct device *dev, struct device_attribute *da, } if (mux_cnv == 0) { - val = ads7871_read_reg16(spi, REG_LS_BYTE); - if (val < 0) - return val; + raw_val = ads7871_read_reg16(spi, REG_LS_BYTE); + if (raw_val < 0) + return raw_val; + /*result in volts*10000 = (val/8192)*2.5*10000*/ - val = ((val >> 2) * 25000) / 8192; - return sysfs_emit(buf, "%d\n", val); + *val = ((raw_val >> 2) * 25000) / 8192; + return 0; } return -ETIMEDOUT; } -static SENSOR_DEVICE_ATTR_RO(in0_input, voltage, 0); -static SENSOR_DEVICE_ATTR_RO(in1_input, voltage, 1); -static SENSOR_DEVICE_ATTR_RO(in2_input, voltage, 2); -static SENSOR_DEVICE_ATTR_RO(in3_input, voltage, 3); -static SENSOR_DEVICE_ATTR_RO(in4_input, voltage, 4); -static SENSOR_DEVICE_ATTR_RO(in5_input, voltage, 5); -static SENSOR_DEVICE_ATTR_RO(in6_input, voltage, 6); -static SENSOR_DEVICE_ATTR_RO(in7_input, voltage, 7); - -static struct attribute *ads7871_attrs[] = { - &sensor_dev_attr_in0_input.dev_attr.attr, - &sensor_dev_attr_in1_input.dev_attr.attr, - &sensor_dev_attr_in2_input.dev_attr.attr, - &sensor_dev_attr_in3_input.dev_attr.attr, - &sensor_dev_attr_in4_input.dev_attr.attr, - &sensor_dev_attr_in5_input.dev_attr.attr, - &sensor_dev_attr_in6_input.dev_attr.attr, - &sensor_dev_attr_in7_input.dev_attr.attr, +static const struct hwmon_channel_info * const ads7871_info[] = { + HWMON_CHANNEL_INFO(in, + HWMON_I_INPUT, HWMON_I_INPUT, HWMON_I_INPUT, HWMON_I_INPUT, + HWMON_I_INPUT, HWMON_I_INPUT, HWMON_I_INPUT, HWMON_I_INPUT), NULL }; -ATTRIBUTE_GROUPS(ads7871); +static const struct hwmon_ops ads7871_hwmon_ops = { + .is_visible = ads7871_is_visible, + .read = ads7871_read, +}; + +static const struct hwmon_chip_info ads7871_chip_info = { + .ops = &ads7871_hwmon_ops, + .info = ads7871_info, +}; static int ads7871_probe(struct spi_device *spi) { @@ -194,10 +200,10 @@ static int ads7871_probe(struct spi_device *spi) return -ENOMEM; pdata->spi = spi; - - hwmon_dev = devm_hwmon_device_register_with_groups(dev, spi->modalias, - pdata, - ads7871_groups); + hwmon_dev = devm_hwmon_device_register_with_info(dev, spi->modalias, + pdata, + &ads7871_chip_info, + NULL); return PTR_ERR_OR_ZERO(hwmon_dev); } -- 2.43.0