diff options
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/hwmon/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hwmon/adt7475.c | 25 | ||||
| -rw-r--r-- | drivers/hwmon/ina2xx.c | 13 | ||||
| -rw-r--r-- | drivers/hwmon/nct6775.c | 2 | ||||
| -rw-r--r-- | drivers/hwmon/raspberrypi-hwmon.c | 166 |
6 files changed, 207 insertions, 10 deletions
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index ccf42663a908..81da17a42dc9 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1320,6 +1320,16 @@ config SENSORS_PWM_FAN This driver can also be built as a module. If so, the module will be called pwm-fan. +config SENSORS_RASPBERRYPI_HWMON + tristate "Raspberry Pi voltage monitor" + depends on RASPBERRYPI_FIRMWARE || (COMPILE_TEST && !RASPBERRYPI_FIRMWARE) + help + If you say yes here you get support for voltage sensor on the + Raspberry Pi. + + This driver can also be built as a module. If so, the module + will be called raspberrypi-hwmon. + config SENSORS_SHT15 tristate "Sensiron humidity and temperature sensors. SHT15 and compat." depends on GPIOLIB || COMPILE_TEST diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 842c92f83ce6..93f7f41ea4ad 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -143,6 +143,7 @@ obj-$(CONFIG_SENSORS_PC87427) += pc87427.o obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o obj-$(CONFIG_SENSORS_POWR1220) += powr1220.o obj-$(CONFIG_SENSORS_PWM_FAN) += pwm-fan.o +obj-$(CONFIG_SENSORS_RASPBERRYPI_HWMON) += raspberrypi-hwmon.o obj-$(CONFIG_SENSORS_S3C) += s3c-hwmon.o obj-$(CONFIG_SENSORS_SCH56XX_COMMON)+= sch56xx-common.o obj-$(CONFIG_SENSORS_SCH5627) += sch5627.o diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c index 90837f7c7d0f..f4c7516eb989 100644 --- a/drivers/hwmon/adt7475.c +++ b/drivers/hwmon/adt7475.c @@ -302,14 +302,18 @@ static inline u16 volt2reg(int channel, long volt, u8 bypass_attn) return clamp_val(reg, 0, 1023) & (0xff << 2); } -static u16 adt7475_read_word(struct i2c_client *client, int reg) +static int adt7475_read_word(struct i2c_client *client, int reg) { - u16 val; + int val1, val2; - val = i2c_smbus_read_byte_data(client, reg); - val |= (i2c_smbus_read_byte_data(client, reg + 1) << 8); + val1 = i2c_smbus_read_byte_data(client, reg); + if (val1 < 0) + return val1; + val2 = i2c_smbus_read_byte_data(client, reg + 1); + if (val2 < 0) + return val2; - return val; + return val1 | (val2 << 8); } static void adt7475_write_word(struct i2c_client *client, int reg, u16 val) @@ -962,13 +966,14 @@ static ssize_t show_pwmfreq(struct device *dev, struct device_attribute *attr, { struct adt7475_data *data = adt7475_update_device(dev); struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); - int i = clamp_val(data->range[sattr->index] & 0xf, 0, - ARRAY_SIZE(pwmfreq_table) - 1); + int idx; if (IS_ERR(data)) return PTR_ERR(data); + idx = clamp_val(data->range[sattr->index] & 0xf, 0, + ARRAY_SIZE(pwmfreq_table) - 1); - return sprintf(buf, "%d\n", pwmfreq_table[i]); + return sprintf(buf, "%d\n", pwmfreq_table[idx]); } static ssize_t set_pwmfreq(struct device *dev, struct device_attribute *attr, @@ -1004,6 +1009,10 @@ static ssize_t pwm_use_point2_pwm_at_crit_show(struct device *dev, char *buf) { struct adt7475_data *data = adt7475_update_device(dev); + + if (IS_ERR(data)) + return PTR_ERR(data); + return sprintf(buf, "%d\n", !!(data->config4 & CONFIG4_MAXDUTY)); } diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c index e9e6aeabbf84..71d3445ba869 100644 --- a/drivers/hwmon/ina2xx.c +++ b/drivers/hwmon/ina2xx.c @@ -17,7 +17,7 @@ * Bi-directional Current/Power Monitor with I2C Interface * Datasheet: http://www.ti.com/product/ina230 * - * Copyright (C) 2012 Lothar Felten <l-felten@ti.com> + * Copyright (C) 2012 Lothar Felten <lothar.felten@gmail.com> * Thanks to Jan Volkering * * This program is free software; you can redistribute it and/or modify @@ -329,6 +329,15 @@ static int ina2xx_set_shunt(struct ina2xx_data *data, long val) return 0; } +static ssize_t ina2xx_show_shunt(struct device *dev, + struct device_attribute *da, + char *buf) +{ + struct ina2xx_data *data = dev_get_drvdata(dev); + + return snprintf(buf, PAGE_SIZE, "%li\n", data->rshunt); +} + static ssize_t ina2xx_store_shunt(struct device *dev, struct device_attribute *da, const char *buf, size_t count) @@ -403,7 +412,7 @@ static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina2xx_show_value, NULL, /* shunt resistance */ static SENSOR_DEVICE_ATTR(shunt_resistor, S_IRUGO | S_IWUSR, - ina2xx_show_value, ina2xx_store_shunt, + ina2xx_show_shunt, ina2xx_store_shunt, INA2XX_CALIBRATION); /* update interval (ina226 only) */ diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c index c6bd61e4695a..944f5b63aecd 100644 --- a/drivers/hwmon/nct6775.c +++ b/drivers/hwmon/nct6775.c @@ -63,6 +63,7 @@ #include <linux/bitops.h> #include <linux/dmi.h> #include <linux/io.h> +#include <linux/nospec.h> #include "lm75.h" #define USE_ALTERNATE @@ -2689,6 +2690,7 @@ store_pwm_weight_temp_sel(struct device *dev, struct device_attribute *attr, return err; if (val > NUM_TEMP) return -EINVAL; + val = array_index_nospec(val, NUM_TEMP + 1); if (val && (!(data->have_temp & BIT(val - 1)) || !data->temp_src[val - 1])) return -EINVAL; diff --git a/drivers/hwmon/raspberrypi-hwmon.c b/drivers/hwmon/raspberrypi-hwmon.c new file mode 100644 index 000000000000..fb4e4a6bb1f6 --- /dev/null +++ b/drivers/hwmon/raspberrypi-hwmon.c @@ -0,0 +1,166 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Raspberry Pi voltage sensor driver + * + * Based on firmware/raspberrypi.c by Noralf Trønnes + * + * Copyright (C) 2018 Stefan Wahren <stefan.wahren@i2se.com> + */ +#include <linux/device.h> +#include <linux/err.h> +#include <linux/hwmon.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/workqueue.h> +#include <soc/bcm2835/raspberrypi-firmware.h> + +#define UNDERVOLTAGE_STICKY_BIT BIT(16) + +struct rpi_hwmon_data { + struct device *hwmon_dev; + struct rpi_firmware *fw; + u32 last_throttled; + struct delayed_work get_values_poll_work; +}; + +static void rpi_firmware_get_throttled(struct rpi_hwmon_data *data) +{ + u32 new_uv, old_uv, value; + int ret; + + /* Request firmware to clear sticky bits */ + value = 0xffff; + + ret = rpi_firmware_property(data->fw, RPI_FIRMWARE_GET_THROTTLED, + &value, sizeof(value)); + if (ret) { + dev_err_once(data->hwmon_dev, "Failed to get throttled (%d)\n", + ret); + return; + } + + new_uv = value & UNDERVOLTAGE_STICKY_BIT; + old_uv = data->last_throttled & UNDERVOLTAGE_STICKY_BIT; + data->last_throttled = value; + + if (new_uv == old_uv) + return; + + if (new_uv) + dev_crit(data->hwmon_dev, "Undervoltage detected!\n"); + else + dev_info(data->hwmon_dev, "Voltage normalised\n"); + + sysfs_notify(&data->hwmon_dev->kobj, NULL, "in0_lcrit_alarm"); +} + +static void get_values_poll(struct work_struct *work) +{ + struct rpi_hwmon_data *data; + + data = container_of(work, struct rpi_hwmon_data, + get_values_poll_work.work); + + rpi_firmware_get_throttled(data); + + /* + * We can't run faster than the sticky shift (100ms) since we get + * flipping in the sticky bits that are cleared. + */ + schedule_delayed_work(&data->get_values_poll_work, 2 * HZ); +} + +static int rpi_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct rpi_hwmon_data *data = dev_get_drvdata(dev); + + *val = !!(data->last_throttled & UNDERVOLTAGE_STICKY_BIT); + return 0; +} + +static umode_t rpi_is_visible(const void *_data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + return 0444; +} + +static const u32 rpi_in_config[] = { + HWMON_I_LCRIT_ALARM, + 0 +}; + +static const struct hwmon_channel_info rpi_in = { + .type = hwmon_in, + .config = rpi_in_config, +}; + +static const struct hwmon_channel_info *rpi_info[] = { + &rpi_in, + NULL +}; + +static const struct hwmon_ops rpi_hwmon_ops = { + .is_visible = rpi_is_visible, + .read = rpi_read, +}; + +static const struct hwmon_chip_info rpi_chip_info = { + .ops = &rpi_hwmon_ops, + .info = rpi_info, +}; + +static int rpi_hwmon_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rpi_hwmon_data *data; + int ret; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + /* Parent driver assure that firmware is correct */ + data->fw = dev_get_drvdata(dev->parent); + + /* Init throttled */ + ret = rpi_firmware_property(data->fw, RPI_FIRMWARE_GET_THROTTLED, + &data->last_throttled, + sizeof(data->last_throttled)); + + data->hwmon_dev = devm_hwmon_device_register_with_info(dev, "rpi_volt", + data, + &rpi_chip_info, + NULL); + + INIT_DELAYED_WORK(&data->get_values_poll_work, get_values_poll); + platform_set_drvdata(pdev, data); + + if (!PTR_ERR_OR_ZERO(data->hwmon_dev)) + schedule_delayed_work(&data->get_values_poll_work, 2 * HZ); + + return PTR_ERR_OR_ZERO(data->hwmon_dev); +} + +static int rpi_hwmon_remove(struct platform_device *pdev) +{ + struct rpi_hwmon_data *data = platform_get_drvdata(pdev); + + cancel_delayed_work_sync(&data->get_values_poll_work); + + return 0; +} + +static struct platform_driver rpi_hwmon_driver = { + .probe = rpi_hwmon_probe, + .remove = rpi_hwmon_remove, + .driver = { + .name = "raspberrypi-hwmon", + }, +}; +module_platform_driver(rpi_hwmon_driver); + +MODULE_AUTHOR("Stefan Wahren <stefan.wahren@i2se.com>"); +MODULE_DESCRIPTION("Raspberry Pi voltage sensor driver"); +MODULE_LICENSE("GPL v2"); |
