From f70575805708cabdedea7498aaa3f710fde4d920 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 31 Jan 2024 03:29:01 +0000
Subject: [PATCH] add lvds1024*800
---
kernel/drivers/hwmon/ina3221.c | 998 ++++++++++++++++++++++++++++++++++++++++++++++------------
1 files changed, 792 insertions(+), 206 deletions(-)
diff --git a/kernel/drivers/hwmon/ina3221.c b/kernel/drivers/hwmon/ina3221.c
index 8c95553..836e757 100644
--- a/kernel/drivers/hwmon/ina3221.c
+++ b/kernel/drivers/hwmon/ina3221.c
@@ -1,25 +1,20 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* INA3221 Triple Current/Voltage Monitor
*
- * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
+ * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com/
* Andrew F. Davis <afd@ti.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
*/
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/i2c.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/of.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
+#include <linux/util_macros.h>
#define INA3221_DRIVER_NAME "ina3221"
@@ -36,21 +31,44 @@
#define INA3221_WARN2 0x0a
#define INA3221_CRIT3 0x0b
#define INA3221_WARN3 0x0c
+#define INA3221_SHUNT_SUM 0x0d
+#define INA3221_CRIT_SUM 0x0e
#define INA3221_MASK_ENABLE 0x0f
+#define INA3221_CONFIG_MODE_MASK GENMASK(2, 0)
+#define INA3221_CONFIG_MODE_POWERDOWN 0
#define INA3221_CONFIG_MODE_SHUNT BIT(0)
#define INA3221_CONFIG_MODE_BUS BIT(1)
#define INA3221_CONFIG_MODE_CONTINUOUS BIT(2)
+#define INA3221_CONFIG_VSH_CT_SHIFT 3
+#define INA3221_CONFIG_VSH_CT_MASK GENMASK(5, 3)
+#define INA3221_CONFIG_VSH_CT(x) (((x) & GENMASK(5, 3)) >> 3)
+#define INA3221_CONFIG_VBUS_CT_SHIFT 6
+#define INA3221_CONFIG_VBUS_CT_MASK GENMASK(8, 6)
+#define INA3221_CONFIG_VBUS_CT(x) (((x) & GENMASK(8, 6)) >> 6)
+#define INA3221_CONFIG_AVG_SHIFT 9
+#define INA3221_CONFIG_AVG_MASK GENMASK(11, 9)
+#define INA3221_CONFIG_AVG(x) (((x) & GENMASK(11, 9)) >> 9)
+#define INA3221_CONFIG_CHs_EN_MASK GENMASK(14, 12)
+#define INA3221_CONFIG_CHx_EN(x) BIT(14 - (x))
+#define INA3221_MASK_ENABLE_SCC_MASK GENMASK(14, 12)
+
+#define INA3221_CONFIG_DEFAULT 0x7127
#define INA3221_RSHUNT_DEFAULT 10000
enum ina3221_fields {
/* Configuration */
F_RST,
- /* Alert Flags */
+ /* Status Flags */
+ F_CVRF,
+
+ /* Warning Flags */
F_WF3, F_WF2, F_WF1,
- F_CF3, F_CF2, F_CF1,
+
+ /* Alert Flags: SF is the summation-alert flag */
+ F_SF, F_CF3, F_CF2, F_CF1,
/* sentinel */
F_MAX_FIELDS
@@ -59,9 +77,11 @@
static const struct reg_field ina3221_reg_fields[] = {
[F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15),
+ [F_CVRF] = REG_FIELD(INA3221_MASK_ENABLE, 0, 0),
[F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3),
[F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4),
[F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5),
+ [F_SF] = REG_FIELD(INA3221_MASK_ENABLE, 6, 6),
[F_CF3] = REG_FIELD(INA3221_MASK_ENABLE, 7, 7),
[F_CF2] = REG_FIELD(INA3221_MASK_ENABLE, 8, 8),
[F_CF1] = REG_FIELD(INA3221_MASK_ENABLE, 9, 9),
@@ -74,29 +94,127 @@
INA3221_NUM_CHANNELS
};
-static const unsigned int register_channel[] = {
- [INA3221_SHUNT1] = INA3221_CHANNEL1,
- [INA3221_SHUNT2] = INA3221_CHANNEL2,
- [INA3221_SHUNT3] = INA3221_CHANNEL3,
- [INA3221_CRIT1] = INA3221_CHANNEL1,
- [INA3221_CRIT2] = INA3221_CHANNEL2,
- [INA3221_CRIT3] = INA3221_CHANNEL3,
- [INA3221_WARN1] = INA3221_CHANNEL1,
- [INA3221_WARN2] = INA3221_CHANNEL2,
- [INA3221_WARN3] = INA3221_CHANNEL3,
+/**
+ * struct ina3221_input - channel input source specific information
+ * @label: label of channel input source
+ * @shunt_resistor: shunt resistor value of channel input source
+ * @disconnected: connection status of channel input source
+ */
+struct ina3221_input {
+ const char *label;
+ int shunt_resistor;
+ bool disconnected;
};
/**
* struct ina3221_data - device specific information
+ * @pm_dev: Device pointer for pm runtime
* @regmap: Register map of the device
* @fields: Register fields of the device
- * @shunt_resistors: Array of resistor values per channel
+ * @inputs: Array of channel input source specific structures
+ * @lock: mutex lock to serialize sysfs attribute accesses
+ * @reg_config: Register value of INA3221_CONFIG
+ * @summation_shunt_resistor: equivalent shunt resistor value for summation
+ * @single_shot: running in single-shot operating mode
*/
struct ina3221_data {
+ struct device *pm_dev;
struct regmap *regmap;
struct regmap_field *fields[F_MAX_FIELDS];
- int shunt_resistors[INA3221_NUM_CHANNELS];
+ struct ina3221_input inputs[INA3221_NUM_CHANNELS];
+ struct mutex lock;
+ u32 reg_config;
+ int summation_shunt_resistor;
+
+ bool single_shot;
};
+
+static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel)
+{
+ /* Summation channel checks shunt resistor values */
+ if (channel > INA3221_CHANNEL3)
+ return ina->summation_shunt_resistor != 0;
+
+ return pm_runtime_active(ina->pm_dev) &&
+ (ina->reg_config & INA3221_CONFIG_CHx_EN(channel));
+}
+
+/**
+ * Helper function to return the resistor value for current summation.
+ *
+ * There is a condition to calculate current summation -- all the shunt
+ * resistor values should be the same, so as to simply fit the formula:
+ * current summation = shunt voltage summation / shunt resistor
+ *
+ * Returns the equivalent shunt resistor value on success or 0 on failure
+ */
+static inline int ina3221_summation_shunt_resistor(struct ina3221_data *ina)
+{
+ struct ina3221_input *input = ina->inputs;
+ int i, shunt_resistor = 0;
+
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
+ if (input[i].disconnected || !input[i].shunt_resistor)
+ continue;
+ if (!shunt_resistor) {
+ /* Found the reference shunt resistor value */
+ shunt_resistor = input[i].shunt_resistor;
+ } else {
+ /* No summation if resistor values are different */
+ if (shunt_resistor != input[i].shunt_resistor)
+ return 0;
+ }
+ }
+
+ return shunt_resistor;
+}
+
+/* Lookup table for Bus and Shunt conversion times in usec */
+static const u16 ina3221_conv_time[] = {
+ 140, 204, 332, 588, 1100, 2116, 4156, 8244,
+};
+
+/* Lookup table for number of samples using in averaging mode */
+static const int ina3221_avg_samples[] = {
+ 1, 4, 16, 64, 128, 256, 512, 1024,
+};
+
+/* Converting update_interval in msec to conversion time in usec */
+static inline u32 ina3221_interval_ms_to_conv_time(u16 config, int interval)
+{
+ u32 channels = hweight16(config & INA3221_CONFIG_CHs_EN_MASK);
+ u32 samples_idx = INA3221_CONFIG_AVG(config);
+ u32 samples = ina3221_avg_samples[samples_idx];
+
+ /* Bisect the result to Bus and Shunt conversion times */
+ return DIV_ROUND_CLOSEST(interval * 1000 / 2, channels * samples);
+}
+
+/* Converting CONFIG register value to update_interval in usec */
+static inline u32 ina3221_reg_to_interval_us(u16 config)
+{
+ u32 channels = hweight16(config & INA3221_CONFIG_CHs_EN_MASK);
+ u32 vbus_ct_idx = INA3221_CONFIG_VBUS_CT(config);
+ u32 vsh_ct_idx = INA3221_CONFIG_VSH_CT(config);
+ u32 samples_idx = INA3221_CONFIG_AVG(config);
+ u32 samples = ina3221_avg_samples[samples_idx];
+ u32 vbus_ct = ina3221_conv_time[vbus_ct_idx];
+ u32 vsh_ct = ina3221_conv_time[vsh_ct_idx];
+
+ /* Calculate total conversion time */
+ return channels * (vbus_ct + vsh_ct) * samples;
+}
+
+static inline int ina3221_wait_for_data(struct ina3221_data *ina)
+{
+ u32 wait, cvrf;
+
+ wait = ina3221_reg_to_interval_us(ina->reg_config);
+
+ /* Polling the CVRF bit to make sure read data is ready */
+ return regmap_field_read_poll_timeout(ina->fields[F_CVRF],
+ cvrf, cvrf, wait, wait * 2);
+}
static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg,
int *val)
@@ -108,83 +226,226 @@
if (ret)
return ret;
- *val = sign_extend32(regval >> 3, 12);
+ /*
+ * Shunt Voltage Sum register has 14-bit value with 1-bit shift
+ * Other Shunt Voltage registers have 12 bits with 3-bit shift
+ */
+ if (reg == INA3221_SHUNT_SUM || reg == INA3221_CRIT_SUM)
+ *val = sign_extend32(regval >> 1, 14);
+ else
+ *val = sign_extend32(regval >> 3, 12);
return 0;
}
-static ssize_t ina3221_show_bus_voltage(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+static const u8 ina3221_in_reg[] = {
+ INA3221_BUS1,
+ INA3221_BUS2,
+ INA3221_BUS3,
+ INA3221_SHUNT1,
+ INA3221_SHUNT2,
+ INA3221_SHUNT3,
+ INA3221_SHUNT_SUM,
+};
+
+static int ina3221_read_chip(struct device *dev, u32 attr, long *val)
{
- struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
- unsigned int reg = sd_attr->index;
- int val, voltage_mv, ret;
+ int regval;
- ret = ina3221_read_value(ina, reg, &val);
- if (ret)
- return ret;
-
- voltage_mv = val * 8;
-
- return snprintf(buf, PAGE_SIZE, "%d\n", voltage_mv);
+ switch (attr) {
+ case hwmon_chip_samples:
+ regval = INA3221_CONFIG_AVG(ina->reg_config);
+ *val = ina3221_avg_samples[regval];
+ return 0;
+ case hwmon_chip_update_interval:
+ /* Return in msec */
+ *val = ina3221_reg_to_interval_us(ina->reg_config);
+ *val = DIV_ROUND_CLOSEST(*val, 1000);
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
}
-static ssize_t ina3221_show_shunt_voltage(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+static int ina3221_read_in(struct device *dev, u32 attr, int channel, long *val)
{
- struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
+ const bool is_shunt = channel > INA3221_CHANNEL3;
struct ina3221_data *ina = dev_get_drvdata(dev);
- unsigned int reg = sd_attr->index;
- int val, voltage_uv, ret;
+ u8 reg = ina3221_in_reg[channel];
+ int regval, ret;
- ret = ina3221_read_value(ina, reg, &val);
- if (ret)
- return ret;
- voltage_uv = val * 40;
+ /*
+ * Translate shunt channel index to sensor channel index except
+ * the 7th channel (6 since being 0-aligned) is for summation.
+ */
+ if (channel != 6)
+ channel %= INA3221_NUM_CHANNELS;
- return snprintf(buf, PAGE_SIZE, "%d\n", voltage_uv);
+ switch (attr) {
+ case hwmon_in_input:
+ if (!ina3221_is_enabled(ina, channel))
+ return -ENODATA;
+
+ /* Write CONFIG register to trigger a single-shot measurement */
+ if (ina->single_shot)
+ regmap_write(ina->regmap, INA3221_CONFIG,
+ ina->reg_config);
+
+ ret = ina3221_wait_for_data(ina);
+ if (ret)
+ return ret;
+
+ ret = ina3221_read_value(ina, reg, ®val);
+ if (ret)
+ return ret;
+
+ /*
+ * Scale of shunt voltage (uV): LSB is 40uV
+ * Scale of bus voltage (mV): LSB is 8mV
+ */
+ *val = regval * (is_shunt ? 40 : 8);
+ return 0;
+ case hwmon_in_enable:
+ *val = ina3221_is_enabled(ina, channel);
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
}
-static ssize_t ina3221_show_current(struct device *dev,
- struct device_attribute *attr, char *buf)
+static const u8 ina3221_curr_reg[][INA3221_NUM_CHANNELS + 1] = {
+ [hwmon_curr_input] = { INA3221_SHUNT1, INA3221_SHUNT2,
+ INA3221_SHUNT3, INA3221_SHUNT_SUM },
+ [hwmon_curr_max] = { INA3221_WARN1, INA3221_WARN2, INA3221_WARN3, 0 },
+ [hwmon_curr_crit] = { INA3221_CRIT1, INA3221_CRIT2,
+ INA3221_CRIT3, INA3221_CRIT_SUM },
+ [hwmon_curr_max_alarm] = { F_WF1, F_WF2, F_WF3, 0 },
+ [hwmon_curr_crit_alarm] = { F_CF1, F_CF2, F_CF3, F_SF },
+};
+
+static int ina3221_read_curr(struct device *dev, u32 attr,
+ int channel, long *val)
{
- struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
- unsigned int reg = sd_attr->index;
- unsigned int channel = register_channel[reg];
- int resistance_uo = ina->shunt_resistors[channel];
- int val, current_ma, voltage_nv, ret;
+ struct ina3221_input *input = ina->inputs;
+ u8 reg = ina3221_curr_reg[attr][channel];
+ int resistance_uo, voltage_nv;
+ int regval, ret;
- ret = ina3221_read_value(ina, reg, &val);
- if (ret)
- return ret;
- voltage_nv = val * 40000;
+ if (channel > INA3221_CHANNEL3)
+ resistance_uo = ina->summation_shunt_resistor;
+ else
+ resistance_uo = input[channel].shunt_resistor;
- current_ma = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo);
+ switch (attr) {
+ case hwmon_curr_input:
+ if (!ina3221_is_enabled(ina, channel))
+ return -ENODATA;
- return snprintf(buf, PAGE_SIZE, "%d\n", current_ma);
+ /* Write CONFIG register to trigger a single-shot measurement */
+ if (ina->single_shot)
+ regmap_write(ina->regmap, INA3221_CONFIG,
+ ina->reg_config);
+
+ ret = ina3221_wait_for_data(ina);
+ if (ret)
+ return ret;
+
+ fallthrough;
+ case hwmon_curr_crit:
+ case hwmon_curr_max:
+ if (!resistance_uo)
+ return -ENODATA;
+
+ ret = ina3221_read_value(ina, reg, ®val);
+ if (ret)
+ return ret;
+
+ /* Scale of shunt voltage: LSB is 40uV (40000nV) */
+ voltage_nv = regval * 40000;
+ /* Return current in mA */
+ *val = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo);
+ return 0;
+ case hwmon_curr_crit_alarm:
+ case hwmon_curr_max_alarm:
+ /* No actual register read if channel is disabled */
+ if (!ina3221_is_enabled(ina, channel)) {
+ /* Return 0 for alert flags */
+ *val = 0;
+ return 0;
+ }
+ ret = regmap_field_read(ina->fields[reg], ®val);
+ if (ret)
+ return ret;
+ *val = regval;
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
}
-static ssize_t ina3221_set_current(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
+static int ina3221_write_chip(struct device *dev, u32 attr, long val)
{
- struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
- unsigned int reg = sd_attr->index;
- unsigned int channel = register_channel[reg];
- int resistance_uo = ina->shunt_resistors[channel];
- int val, current_ma, voltage_uv, ret;
+ int ret, idx;
+ u32 tmp;
- ret = kstrtoint(buf, 0, ¤t_ma);
- if (ret)
- return ret;
+ switch (attr) {
+ case hwmon_chip_samples:
+ idx = find_closest(val, ina3221_avg_samples,
+ ARRAY_SIZE(ina3221_avg_samples));
+
+ tmp = (ina->reg_config & ~INA3221_CONFIG_AVG_MASK) |
+ (idx << INA3221_CONFIG_AVG_SHIFT);
+ ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp);
+ if (ret)
+ return ret;
+
+ /* Update reg_config accordingly */
+ ina->reg_config = tmp;
+ return 0;
+ case hwmon_chip_update_interval:
+ tmp = ina3221_interval_ms_to_conv_time(ina->reg_config, val);
+ idx = find_closest(tmp, ina3221_conv_time,
+ ARRAY_SIZE(ina3221_conv_time));
+
+ /* Update Bus and Shunt voltage conversion times */
+ tmp = INA3221_CONFIG_VBUS_CT_MASK | INA3221_CONFIG_VSH_CT_MASK;
+ tmp = (ina->reg_config & ~tmp) |
+ (idx << INA3221_CONFIG_VBUS_CT_SHIFT) |
+ (idx << INA3221_CONFIG_VSH_CT_SHIFT);
+ ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp);
+ if (ret)
+ return ret;
+
+ /* Update reg_config accordingly */
+ ina->reg_config = tmp;
+ return 0;
+ default:
+ return -EOPNOTSUPP;
+ }
+}
+
+static int ina3221_write_curr(struct device *dev, u32 attr,
+ int channel, long val)
+{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ struct ina3221_input *input = ina->inputs;
+ u8 reg = ina3221_curr_reg[attr][channel];
+ int resistance_uo, current_ma, voltage_uv;
+ int regval;
+
+ if (channel > INA3221_CHANNEL3)
+ resistance_uo = ina->summation_shunt_resistor;
+ else
+ resistance_uo = input[channel].shunt_resistor;
+
+ if (!resistance_uo)
+ return -EOPNOTSUPP;
/* clamp current */
- current_ma = clamp_val(current_ma,
+ current_ma = clamp_val(val,
INT_MIN / resistance_uo,
INT_MAX / resistance_uo);
@@ -193,36 +454,261 @@
/* clamp voltage */
voltage_uv = clamp_val(voltage_uv, -163800, 163800);
- /* 1 / 40uV(scale) << 3(register shift) = 5 */
- val = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
+ /*
+ * Formula to convert voltage_uv to register value:
+ * regval = (voltage_uv / scale) << shift
+ * Note:
+ * The scale is 40uV for all shunt voltage registers
+ * Shunt Voltage Sum register left-shifts 1 bit
+ * All other Shunt Voltage registers shift 3 bits
+ * Results:
+ * SHUNT_SUM: (1 / 40uV) << 1 = 1 / 20uV
+ * SHUNT[1-3]: (1 / 40uV) << 3 = 1 / 5uV
+ */
+ if (reg == INA3221_SHUNT_SUM || reg == INA3221_CRIT_SUM)
+ regval = DIV_ROUND_CLOSEST(voltage_uv, 20) & 0xfffe;
+ else
+ regval = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8;
- ret = regmap_write(ina->regmap, reg, val);
- if (ret)
- return ret;
-
- return count;
+ return regmap_write(ina->regmap, reg, regval);
}
-static ssize_t ina3221_show_shunt(struct device *dev,
+static int ina3221_write_enable(struct device *dev, int channel, bool enable)
+{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ u16 config, mask = INA3221_CONFIG_CHx_EN(channel);
+ u16 config_old = ina->reg_config & mask;
+ u32 tmp;
+ int ret;
+
+ config = enable ? mask : 0;
+
+ /* Bypass if enable status is not being changed */
+ if (config_old == config)
+ return 0;
+
+ /* For enabling routine, increase refcount and resume() at first */
+ if (enable) {
+ ret = pm_runtime_resume_and_get(ina->pm_dev);
+ if (ret < 0) {
+ dev_err(dev, "Failed to get PM runtime\n");
+ return ret;
+ }
+ }
+
+ /* Enable or disable the channel */
+ tmp = (ina->reg_config & ~mask) | (config & mask);
+ ret = regmap_write(ina->regmap, INA3221_CONFIG, tmp);
+ if (ret)
+ goto fail;
+
+ /* Cache the latest config register value */
+ ina->reg_config = tmp;
+
+ /* For disabling routine, decrease refcount or suspend() at last */
+ if (!enable)
+ pm_runtime_put_sync(ina->pm_dev);
+
+ return 0;
+
+fail:
+ if (enable) {
+ dev_err(dev, "Failed to enable channel %d: error %d\n",
+ channel, ret);
+ pm_runtime_put_sync(ina->pm_dev);
+ }
+
+ return ret;
+}
+
+static int ina3221_read(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ int ret;
+
+ mutex_lock(&ina->lock);
+
+ switch (type) {
+ case hwmon_chip:
+ ret = ina3221_read_chip(dev, attr, val);
+ break;
+ case hwmon_in:
+ /* 0-align channel ID */
+ ret = ina3221_read_in(dev, attr, channel - 1, val);
+ break;
+ case hwmon_curr:
+ ret = ina3221_read_curr(dev, attr, channel, val);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ mutex_unlock(&ina->lock);
+
+ return ret;
+}
+
+static int ina3221_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ int ret;
+
+ mutex_lock(&ina->lock);
+
+ switch (type) {
+ case hwmon_chip:
+ ret = ina3221_write_chip(dev, attr, val);
+ break;
+ case hwmon_in:
+ /* 0-align channel ID */
+ ret = ina3221_write_enable(dev, channel - 1, val);
+ break;
+ case hwmon_curr:
+ ret = ina3221_write_curr(dev, attr, channel, val);
+ break;
+ default:
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ mutex_unlock(&ina->lock);
+
+ return ret;
+}
+
+static int ina3221_read_string(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, const char **str)
+{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ int index = channel - 1;
+
+ if (channel == 7)
+ *str = "sum of shunt voltages";
+ else
+ *str = ina->inputs[index].label;
+
+ return 0;
+}
+
+static umode_t ina3221_is_visible(const void *drvdata,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+{
+ const struct ina3221_data *ina = drvdata;
+ const struct ina3221_input *input = NULL;
+
+ switch (type) {
+ case hwmon_chip:
+ switch (attr) {
+ case hwmon_chip_samples:
+ case hwmon_chip_update_interval:
+ return 0644;
+ default:
+ return 0;
+ }
+ case hwmon_in:
+ /* Ignore in0_ */
+ if (channel == 0)
+ return 0;
+
+ switch (attr) {
+ case hwmon_in_label:
+ if (channel - 1 <= INA3221_CHANNEL3)
+ input = &ina->inputs[channel - 1];
+ else if (channel == 7)
+ return 0444;
+ /* Hide label node if label is not provided */
+ return (input && input->label) ? 0444 : 0;
+ case hwmon_in_input:
+ return 0444;
+ case hwmon_in_enable:
+ return 0644;
+ default:
+ return 0;
+ }
+ case hwmon_curr:
+ switch (attr) {
+ case hwmon_curr_input:
+ case hwmon_curr_crit_alarm:
+ case hwmon_curr_max_alarm:
+ return 0444;
+ case hwmon_curr_crit:
+ case hwmon_curr_max:
+ return 0644;
+ default:
+ return 0;
+ }
+ default:
+ return 0;
+ }
+}
+
+#define INA3221_HWMON_CURR_CONFIG (HWMON_C_INPUT | \
+ HWMON_C_CRIT | HWMON_C_CRIT_ALARM | \
+ HWMON_C_MAX | HWMON_C_MAX_ALARM)
+
+static const struct hwmon_channel_info *ina3221_info[] = {
+ HWMON_CHANNEL_INFO(chip,
+ HWMON_C_SAMPLES,
+ HWMON_C_UPDATE_INTERVAL),
+ HWMON_CHANNEL_INFO(in,
+ /* 0: dummy, skipped in is_visible */
+ HWMON_I_INPUT,
+ /* 1-3: input voltage Channels */
+ HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
+ HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
+ /* 4-6: shunt voltage Channels */
+ HWMON_I_INPUT,
+ HWMON_I_INPUT,
+ HWMON_I_INPUT,
+ /* 7: summation of shunt voltage channels */
+ HWMON_I_INPUT | HWMON_I_LABEL),
+ HWMON_CHANNEL_INFO(curr,
+ /* 1-3: current channels*/
+ INA3221_HWMON_CURR_CONFIG,
+ INA3221_HWMON_CURR_CONFIG,
+ INA3221_HWMON_CURR_CONFIG,
+ /* 4: summation of current channels */
+ HWMON_C_INPUT | HWMON_C_CRIT | HWMON_C_CRIT_ALARM),
+ NULL
+};
+
+static const struct hwmon_ops ina3221_hwmon_ops = {
+ .is_visible = ina3221_is_visible,
+ .read_string = ina3221_read_string,
+ .read = ina3221_read,
+ .write = ina3221_write,
+};
+
+static const struct hwmon_chip_info ina3221_chip_info = {
+ .ops = &ina3221_hwmon_ops,
+ .info = ina3221_info,
+};
+
+/* Extra attribute groups */
+static ssize_t ina3221_shunt_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int channel = sd_attr->index;
- unsigned int resistance_uo;
+ struct ina3221_input *input = &ina->inputs[channel];
- resistance_uo = ina->shunt_resistors[channel];
-
- return snprintf(buf, PAGE_SIZE, "%d\n", resistance_uo);
+ return snprintf(buf, PAGE_SIZE, "%d\n", input->shunt_resistor);
}
-static ssize_t ina3221_set_shunt(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
+static ssize_t ina3221_shunt_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
struct ina3221_data *ina = dev_get_drvdata(dev);
unsigned int channel = sd_attr->index;
+ struct ina3221_input *input = &ina->inputs[channel];
int val;
int ret;
@@ -232,128 +718,30 @@
val = clamp_val(val, 1, INT_MAX);
- ina->shunt_resistors[channel] = val;
+ input->shunt_resistor = val;
+
+ /* Update summation_shunt_resistor for summation channel */
+ ina->summation_shunt_resistor = ina3221_summation_shunt_resistor(ina);
return count;
}
-static ssize_t ina3221_show_alert(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr);
- struct ina3221_data *ina = dev_get_drvdata(dev);
- unsigned int field = sd_attr->index;
- unsigned int regval;
- int ret;
-
- ret = regmap_field_read(ina->fields[field], ®val);
- if (ret)
- return ret;
-
- return snprintf(buf, PAGE_SIZE, "%d\n", regval);
-}
-
-/* bus voltage */
-static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO,
- ina3221_show_bus_voltage, NULL, INA3221_BUS1);
-static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO,
- ina3221_show_bus_voltage, NULL, INA3221_BUS2);
-static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO,
- ina3221_show_bus_voltage, NULL, INA3221_BUS3);
-
-/* calculated current */
-static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO,
- ina3221_show_current, NULL, INA3221_SHUNT1);
-static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO,
- ina3221_show_current, NULL, INA3221_SHUNT2);
-static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO,
- ina3221_show_current, NULL, INA3221_SHUNT3);
-
/* shunt resistance */
-static SENSOR_DEVICE_ATTR(shunt1_resistor, S_IRUGO | S_IWUSR,
- ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL1);
-static SENSOR_DEVICE_ATTR(shunt2_resistor, S_IRUGO | S_IWUSR,
- ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL2);
-static SENSOR_DEVICE_ATTR(shunt3_resistor, S_IRUGO | S_IWUSR,
- ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL3);
-
-/* critical current */
-static SENSOR_DEVICE_ATTR(curr1_crit, S_IRUGO | S_IWUSR,
- ina3221_show_current, ina3221_set_current, INA3221_CRIT1);
-static SENSOR_DEVICE_ATTR(curr2_crit, S_IRUGO | S_IWUSR,
- ina3221_show_current, ina3221_set_current, INA3221_CRIT2);
-static SENSOR_DEVICE_ATTR(curr3_crit, S_IRUGO | S_IWUSR,
- ina3221_show_current, ina3221_set_current, INA3221_CRIT3);
-
-/* critical current alert */
-static SENSOR_DEVICE_ATTR(curr1_crit_alarm, S_IRUGO,
- ina3221_show_alert, NULL, F_CF1);
-static SENSOR_DEVICE_ATTR(curr2_crit_alarm, S_IRUGO,
- ina3221_show_alert, NULL, F_CF2);
-static SENSOR_DEVICE_ATTR(curr3_crit_alarm, S_IRUGO,
- ina3221_show_alert, NULL, F_CF3);
-
-/* warning current */
-static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR,
- ina3221_show_current, ina3221_set_current, INA3221_WARN1);
-static SENSOR_DEVICE_ATTR(curr2_max, S_IRUGO | S_IWUSR,
- ina3221_show_current, ina3221_set_current, INA3221_WARN2);
-static SENSOR_DEVICE_ATTR(curr3_max, S_IRUGO | S_IWUSR,
- ina3221_show_current, ina3221_set_current, INA3221_WARN3);
-
-/* warning current alert */
-static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO,
- ina3221_show_alert, NULL, F_WF1);
-static SENSOR_DEVICE_ATTR(curr2_max_alarm, S_IRUGO,
- ina3221_show_alert, NULL, F_WF2);
-static SENSOR_DEVICE_ATTR(curr3_max_alarm, S_IRUGO,
- ina3221_show_alert, NULL, F_WF3);
-
-/* shunt voltage */
-static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO,
- ina3221_show_shunt_voltage, NULL, INA3221_SHUNT1);
-static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO,
- ina3221_show_shunt_voltage, NULL, INA3221_SHUNT2);
-static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO,
- ina3221_show_shunt_voltage, NULL, INA3221_SHUNT3);
+static SENSOR_DEVICE_ATTR_RW(shunt1_resistor, ina3221_shunt, INA3221_CHANNEL1);
+static SENSOR_DEVICE_ATTR_RW(shunt2_resistor, ina3221_shunt, INA3221_CHANNEL2);
+static SENSOR_DEVICE_ATTR_RW(shunt3_resistor, ina3221_shunt, INA3221_CHANNEL3);
static struct attribute *ina3221_attrs[] = {
- /* channel 1 */
- &sensor_dev_attr_in1_input.dev_attr.attr,
- &sensor_dev_attr_curr1_input.dev_attr.attr,
&sensor_dev_attr_shunt1_resistor.dev_attr.attr,
- &sensor_dev_attr_curr1_crit.dev_attr.attr,
- &sensor_dev_attr_curr1_crit_alarm.dev_attr.attr,
- &sensor_dev_attr_curr1_max.dev_attr.attr,
- &sensor_dev_attr_curr1_max_alarm.dev_attr.attr,
- &sensor_dev_attr_in4_input.dev_attr.attr,
-
- /* channel 2 */
- &sensor_dev_attr_in2_input.dev_attr.attr,
- &sensor_dev_attr_curr2_input.dev_attr.attr,
&sensor_dev_attr_shunt2_resistor.dev_attr.attr,
- &sensor_dev_attr_curr2_crit.dev_attr.attr,
- &sensor_dev_attr_curr2_crit_alarm.dev_attr.attr,
- &sensor_dev_attr_curr2_max.dev_attr.attr,
- &sensor_dev_attr_curr2_max_alarm.dev_attr.attr,
- &sensor_dev_attr_in5_input.dev_attr.attr,
-
- /* channel 3 */
- &sensor_dev_attr_in3_input.dev_attr.attr,
- &sensor_dev_attr_curr3_input.dev_attr.attr,
&sensor_dev_attr_shunt3_resistor.dev_attr.attr,
- &sensor_dev_attr_curr3_crit.dev_attr.attr,
- &sensor_dev_attr_curr3_crit_alarm.dev_attr.attr,
- &sensor_dev_attr_curr3_max.dev_attr.attr,
- &sensor_dev_attr_curr3_max_alarm.dev_attr.attr,
- &sensor_dev_attr_in6_input.dev_attr.attr,
-
NULL,
};
ATTRIBUTE_GROUPS(ina3221);
static const struct regmap_range ina3221_yes_ranges[] = {
- regmap_reg_range(INA3221_SHUNT1, INA3221_BUS3),
+ regmap_reg_range(INA3221_CONFIG, INA3221_BUS3),
+ regmap_reg_range(INA3221_SHUNT_SUM, INA3221_SHUNT_SUM),
regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE),
};
@@ -370,8 +758,71 @@
.volatile_table = &ina3221_volatile_table,
};
-static int ina3221_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
+static int ina3221_probe_child_from_dt(struct device *dev,
+ struct device_node *child,
+ struct ina3221_data *ina)
+{
+ struct ina3221_input *input;
+ u32 val;
+ int ret;
+
+ ret = of_property_read_u32(child, "reg", &val);
+ if (ret) {
+ dev_err(dev, "missing reg property of %pOFn\n", child);
+ return ret;
+ } else if (val > INA3221_CHANNEL3) {
+ dev_err(dev, "invalid reg %d of %pOFn\n", val, child);
+ return -EINVAL;
+ }
+
+ input = &ina->inputs[val];
+
+ /* Log the disconnected channel input */
+ if (!of_device_is_available(child)) {
+ input->disconnected = true;
+ return 0;
+ }
+
+ /* Save the connected input label if available */
+ of_property_read_string(child, "label", &input->label);
+
+ /* Overwrite default shunt resistor value optionally */
+ if (!of_property_read_u32(child, "shunt-resistor-micro-ohms", &val)) {
+ if (val < 1 || val > INT_MAX) {
+ dev_err(dev, "invalid shunt resistor value %u of %pOFn\n",
+ val, child);
+ return -EINVAL;
+ }
+ input->shunt_resistor = val;
+ }
+
+ return 0;
+}
+
+static int ina3221_probe_from_dt(struct device *dev, struct ina3221_data *ina)
+{
+ const struct device_node *np = dev->of_node;
+ struct device_node *child;
+ int ret;
+
+ /* Compatible with non-DT platforms */
+ if (!np)
+ return 0;
+
+ ina->single_shot = of_property_read_bool(np, "ti,single-shot");
+
+ for_each_child_of_node(np, child) {
+ ret = ina3221_probe_child_from_dt(dev, child, ina);
+ if (ret) {
+ of_node_put(child);
+ return ret;
+ }
+ }
+
+ return 0;
+}
+
+static int ina3221_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct ina3221_data *ina;
@@ -399,24 +850,157 @@
}
for (i = 0; i < INA3221_NUM_CHANNELS; i++)
- ina->shunt_resistors[i] = INA3221_RSHUNT_DEFAULT;
+ ina->inputs[i].shunt_resistor = INA3221_RSHUNT_DEFAULT;
+ ret = ina3221_probe_from_dt(dev, ina);
+ if (ret) {
+ dev_err(dev, "Unable to probe from device tree\n");
+ return ret;
+ }
+
+ /* The driver will be reset, so use reset value */
+ ina->reg_config = INA3221_CONFIG_DEFAULT;
+
+ /* Clear continuous bit to use single-shot mode */
+ if (ina->single_shot)
+ ina->reg_config &= ~INA3221_CONFIG_MODE_CONTINUOUS;
+
+ /* Disable channels if their inputs are disconnected */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
+ if (ina->inputs[i].disconnected)
+ ina->reg_config &= ~INA3221_CONFIG_CHx_EN(i);
+ }
+
+ /* Initialize summation_shunt_resistor for summation channel control */
+ ina->summation_shunt_resistor = ina3221_summation_shunt_resistor(ina);
+
+ ina->pm_dev = dev;
+ mutex_init(&ina->lock);
+ dev_set_drvdata(dev, ina);
+
+ /* Enable PM runtime -- status is suspended by default */
+ pm_runtime_enable(ina->pm_dev);
+
+ /* Initialize (resume) the device */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
+ if (ina->inputs[i].disconnected)
+ continue;
+ /* Match the refcount with number of enabled channels */
+ ret = pm_runtime_get_sync(ina->pm_dev);
+ if (ret < 0)
+ goto fail;
+ }
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, ina,
+ &ina3221_chip_info,
+ ina3221_groups);
+ if (IS_ERR(hwmon_dev)) {
+ dev_err(dev, "Unable to register hwmon device\n");
+ ret = PTR_ERR(hwmon_dev);
+ goto fail;
+ }
+
+ return 0;
+
+fail:
+ pm_runtime_disable(ina->pm_dev);
+ pm_runtime_set_suspended(ina->pm_dev);
+ /* pm_runtime_put_noidle() will decrease the PM refcount until 0 */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++)
+ pm_runtime_put_noidle(ina->pm_dev);
+ mutex_destroy(&ina->lock);
+
+ return ret;
+}
+
+static int ina3221_remove(struct i2c_client *client)
+{
+ struct ina3221_data *ina = dev_get_drvdata(&client->dev);
+ int i;
+
+ pm_runtime_disable(ina->pm_dev);
+ pm_runtime_set_suspended(ina->pm_dev);
+
+ /* pm_runtime_put_noidle() will decrease the PM refcount until 0 */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++)
+ pm_runtime_put_noidle(ina->pm_dev);
+
+ mutex_destroy(&ina->lock);
+
+ return 0;
+}
+
+static int __maybe_unused ina3221_suspend(struct device *dev)
+{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ int ret;
+
+ /* Save config register value and enable cache-only */
+ ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
+ if (ret)
+ return ret;
+
+ /* Set to power-down mode for power saving */
+ ret = regmap_update_bits(ina->regmap, INA3221_CONFIG,
+ INA3221_CONFIG_MODE_MASK,
+ INA3221_CONFIG_MODE_POWERDOWN);
+ if (ret)
+ return ret;
+
+ regcache_cache_only(ina->regmap, true);
+ regcache_mark_dirty(ina->regmap);
+
+ return 0;
+}
+
+static int __maybe_unused ina3221_resume(struct device *dev)
+{
+ struct ina3221_data *ina = dev_get_drvdata(dev);
+ int ret;
+
+ regcache_cache_only(ina->regmap, false);
+
+ /* Software reset the chip */
ret = regmap_field_write(ina->fields[F_RST], true);
if (ret) {
dev_err(dev, "Unable to reset device\n");
return ret;
}
- hwmon_dev = devm_hwmon_device_register_with_groups(dev,
- client->name,
- ina, ina3221_groups);
- if (IS_ERR(hwmon_dev)) {
- dev_err(dev, "Unable to register hwmon device\n");
- return PTR_ERR(hwmon_dev);
+ /* Restore cached register values to hardware */
+ ret = regcache_sync(ina->regmap);
+ if (ret)
+ return ret;
+
+ /* Restore config register value to hardware */
+ ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config);
+ if (ret)
+ return ret;
+
+ /* Initialize summation channel control */
+ if (ina->summation_shunt_resistor) {
+ /*
+ * Take all three channels into summation by default
+ * Shunt measurements of disconnected channels should
+ * be 0, so it does not matter for summation.
+ */
+ ret = regmap_update_bits(ina->regmap, INA3221_MASK_ENABLE,
+ INA3221_MASK_ENABLE_SCC_MASK,
+ INA3221_MASK_ENABLE_SCC_MASK);
+ if (ret) {
+ dev_err(dev, "Unable to control summation channel\n");
+ return ret;
+ }
}
return 0;
}
+
+static const struct dev_pm_ops ina3221_pm = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(ina3221_suspend, ina3221_resume, NULL)
+};
static const struct of_device_id ina3221_of_match_table[] = {
{ .compatible = "ti,ina3221", },
@@ -431,10 +1015,12 @@
MODULE_DEVICE_TABLE(i2c, ina3221_ids);
static struct i2c_driver ina3221_i2c_driver = {
- .probe = ina3221_probe,
+ .probe_new = ina3221_probe,
+ .remove = ina3221_remove,
.driver = {
.name = INA3221_DRIVER_NAME,
.of_match_table = ina3221_of_match_table,
+ .pm = &ina3221_pm,
},
.id_table = ina3221_ids,
};
--
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