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Subject[PATCH 2/3] hwmon: da9063: HWMON driver
Date
From: "Opensource [Steve Twiss]" <stwiss.opensource@diasemi.com>

Add the HWMON driver for DA9063

Signed-off-by: Opensource [Steve Twiss] <stwiss.opensource@diasemi.com>

Simplify and modernise the code a bit.
Add minimal of_match_table.
Fix logic inversion in detecting conversion end.
Drop support for ADCIN: these are multi-purpose channels and must not
be reconfigured unless explicitly authorised by the board description.

Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com>
---
This patch depends on patch 1/3.
Originally submitted by Steve Twiss in 2014:
https://marc.info/?l=linux-kernel&m=139560868309857&w=2

drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/da9063-hwmon.c | 287 +++++++++++++++++++++++++++
include/linux/mfd/da9063/registers.h | 34 ++++
4 files changed, 332 insertions(+)
create mode 100644 drivers/hwmon/da9063-hwmon.c

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 87624902ea80..17244cfaa855 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -515,6 +515,16 @@ config SENSORS_DA9055
This driver can also be built as a module. If so, the module
will be called da9055-hwmon.

+config SENSORS_DA9063
+ tristate "Dialog Semiconductor DA9063"
+ depends on MFD_DA9063
+ help
+ If you say yes here you get support for the hardware
+ monitoring features of the DA9063 Power Management IC.
+
+ This driver can also be built as a module. If so, the module
+ will be called da9063-hwmon.
+
config SENSORS_I5K_AMB
tristate "FB-DIMM AMB temperature sensor on Intel 5000 series chipsets"
depends on PCI
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 59e78bc212cf..6855711ed9ec 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -60,6 +60,7 @@ obj-$(CONFIG_SENSORS_CORSAIR_CPRO) += corsair-cpro.o
obj-$(CONFIG_SENSORS_CORSAIR_PSU) += corsair-psu.o
obj-$(CONFIG_SENSORS_DA9052_ADC)+= da9052-hwmon.o
obj-$(CONFIG_SENSORS_DA9055)+= da9055-hwmon.o
+obj-$(CONFIG_SENSORS_DA9063) += da9063-hwmon.o
obj-$(CONFIG_SENSORS_DELL_SMM) += dell-smm-hwmon.o
obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
obj-$(CONFIG_SENSORS_DRIVETEMP) += drivetemp.o
diff --git a/drivers/hwmon/da9063-hwmon.c b/drivers/hwmon/da9063-hwmon.c
new file mode 100644
index 000000000000..35b5bb0290ca
--- /dev/null
+++ b/drivers/hwmon/da9063-hwmon.c
@@ -0,0 +1,287 @@
+/* da9063-hwmon.c - Hardware monitor support for DA9063
+ * Copyright (C) 2014 Dialog Semiconductor Ltd.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/platform_device.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/regmap.h>
+#include <linux/mfd/da9063/core.h>
+#include <linux/mod_devicetable.h>
+
+#define DA9063_ADC_RES (1 << (DA9063_ADC_RES_L_BITS + DA9063_ADC_RES_M_BITS))
+#define DA9063_ADC_MAX (DA9063_ADC_RES - 1)
+#define DA9063_2V5 2500
+#define DA9063_5V0 5000
+#define DA9063_5V5 5500
+#define DA9063_TJUNC_M -398
+#define DA9063_TJUNC_O 330000
+#define DA9063_VBBAT_M 2048
+
+enum da9063_adc {
+ DA9063_CHAN_VSYS = DA9063_ADC_MUX_VSYS,
+ DA9063_CHAN_ADCIN1 = DA9063_ADC_MUX_ADCIN1,
+ DA9063_CHAN_ADCIN2 = DA9063_ADC_MUX_ADCIN2,
+ DA9063_CHAN_ADCIN3 = DA9063_ADC_MUX_ADCIN3,
+ DA9063_CHAN_TJUNC = DA9063_ADC_MUX_T_SENSE,
+ DA9063_CHAN_VBBAT = DA9063_ADC_MUX_VBBAT,
+ DA9063_CHAN_LDO_G1 = DA9063_ADC_MUX_LDO_G1,
+ DA9063_CHAN_LDO_G2 = DA9063_ADC_MUX_LDO_G2,
+ DA9063_CHAN_LDO_G3 = DA9063_ADC_MUX_LDO_G3
+};
+
+struct da9063_hwmon {
+ struct da9063 *da9063;
+ struct mutex hwmon_mutex;
+ struct completion adc_ready;
+ signed char tjunc_offset;
+};
+
+static int da9063_adc_convert(struct da9063_hwmon *hwmon, int channel,
+ int *value)
+{
+ int val = *value;
+ int ret = 0;
+
+ switch (channel) {
+ case DA9063_CHAN_VSYS:
+ val = ((DA9063_5V5 - DA9063_2V5) * val) / DA9063_ADC_MAX +
+ DA9063_2V5;
+ break;
+ case DA9063_CHAN_TJUNC:
+ val -= hwmon->tjunc_offset;
+ val = DA9063_TJUNC_M * val + DA9063_TJUNC_O;
+ break;
+ case DA9063_CHAN_VBBAT:
+ val = (DA9063_5V0 * val) / DA9063_ADC_MAX;
+ break;
+ default:
+ ret = -EINVAL;
+ goto err_convert;
+ }
+
+ *value = val;
+err_convert:
+ return ret;
+}
+
+
+static int da9063_adc_manual_read(struct da9063_hwmon *hwmon, int channel)
+{
+ int ret;
+ unsigned char val;
+ unsigned char data[2];
+ int adc_man;
+
+ mutex_lock(&hwmon->hwmon_mutex);
+
+ init_completion(&hwmon->adc_ready);
+
+ val = (channel & DA9063_ADC_MUX_MASK) | DA9063_ADC_MAN;
+ ret = regmap_update_bits(hwmon->da9063->regmap, DA9063_REG_ADC_MAN,
+ DA9063_ADC_MUX_MASK | DA9063_ADC_MAN, val);
+ if (ret < 0)
+ goto err_mread;
+
+ ret = wait_for_completion_timeout(&hwmon->adc_ready,
+ msecs_to_jiffies(1000));
+ if (ret == 0) {
+ ret = -ETIMEDOUT;
+ goto err_mread;
+ }
+
+ ret = regmap_read(hwmon->da9063->regmap, DA9063_REG_ADC_MAN, &adc_man);
+ if (ret < 0)
+ goto err_mread;
+
+ /* data value is not ready */
+ if (adc_man & DA9063_ADC_MAN) {
+ ret = -EINVAL;
+ goto err_mread;
+ }
+
+ ret = regmap_bulk_read(hwmon->da9063->regmap,
+ DA9063_REG_ADC_RES_L, data, 2);
+ if (ret < 0)
+ goto err_mread;
+
+ ret = (data[0] & DA9063_ADC_RES_L_MASK) >> DA9063_ADC_RES_L_SHIFT;
+ ret |= data[1] << DA9063_ADC_RES_L_BITS;
+err_mread:
+ mutex_unlock(&hwmon->hwmon_mutex);
+ return ret;
+}
+
+static irqreturn_t da9063_hwmon_irq_handler(int irq, void *irq_data)
+{
+ struct da9063_hwmon *hwmon = irq_data;
+ complete(&hwmon->adc_ready);
+ return IRQ_HANDLED;
+}
+
+static ssize_t da9063_adc_show(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct da9063_hwmon *hwmon = dev_get_drvdata(dev);
+ int channel = to_sensor_dev_attr(devattr)->index;
+ int val;
+ int ret;
+
+ switch (channel) {
+ case DA9063_CHAN_VSYS:
+ case DA9063_CHAN_TJUNC:
+ case DA9063_CHAN_VBBAT:
+ /* fallthrough for internal measures */
+ val = da9063_adc_manual_read(hwmon, channel);
+ if (val < 0) {
+ dev_err(dev, "ADC read error %d\n", val);
+ return val;
+ }
+ break;
+
+ default:
+ /* error case */
+ ret = -EINVAL;
+ goto err_read;
+ }
+
+ ret = da9063_adc_convert(hwmon, channel, &val);
+ if (ret < 0) {
+ dev_err(dev, "Failed to convert ADC value %d\n", ret);
+ goto err_read;
+ }
+
+ return sprintf(buf, "%d\n", val);
+err_read:
+ return ret;
+}
+
+
+static ssize_t da9063_label_show(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ int channel = to_sensor_dev_attr(devattr)->index;
+ char *label;
+
+ switch (channel) {
+ case DA9063_CHAN_VSYS:
+ label = "VSYS";
+ break;
+ case DA9063_CHAN_TJUNC:
+ label = "TJUNC";
+ break;
+ case DA9063_CHAN_VBBAT:
+ label = "VBBAT";
+ break;
+ default:
+ label = "UNKNOWN";
+ }
+
+ return sprintf(buf, "%s\n", label);
+}
+
+static SENSOR_DEVICE_ATTR_RO(in0_input,
+ da9063_adc, DA9063_CHAN_VSYS);
+static SENSOR_DEVICE_ATTR_RO(in0_label,
+ da9063_label, DA9063_CHAN_VSYS);
+
+static SENSOR_DEVICE_ATTR_RO(in4_input,
+ da9063_adc, DA9063_CHAN_VBBAT);
+static SENSOR_DEVICE_ATTR_RO(in4_label,
+ da9063_label, DA9063_CHAN_VBBAT);
+
+static SENSOR_DEVICE_ATTR_RO(temp1_input,
+ da9063_adc, DA9063_CHAN_TJUNC);
+static SENSOR_DEVICE_ATTR_RO(temp1_label,
+ da9063_label, DA9063_CHAN_TJUNC);
+
+static struct attribute *da9063_attrs[] = {
+ &sensor_dev_attr_in0_input.dev_attr.attr,
+ &sensor_dev_attr_in0_label.dev_attr.attr,
+ &sensor_dev_attr_in4_input.dev_attr.attr,
+ &sensor_dev_attr_in4_label.dev_attr.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_label.dev_attr.attr,
+ NULL
+};
+
+ATTRIBUTE_GROUPS(da9063);
+
+static int da9063_hwmon_probe(struct platform_device *pdev)
+{
+ struct da9063 *da9063 = dev_get_drvdata(pdev->dev.parent);
+ struct da9063_hwmon *hwmon;
+ struct device *hwmon_dev;
+ int irq;
+ int ret;
+
+ hwmon = devm_kzalloc(&pdev->dev, sizeof(struct da9063_hwmon),
+ GFP_KERNEL);
+ if (!hwmon)
+ return -ENOMEM;
+
+ mutex_init(&hwmon->hwmon_mutex);
+ init_completion(&hwmon->adc_ready);
+ hwmon->da9063 = da9063;
+
+ irq = platform_get_irq_byname(pdev, DA9063_DRVNAME_HWMON);
+ if (irq < 0)
+ return irq;
+
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ da9063_hwmon_irq_handler,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "HWMON", hwmon);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request IRQ.\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, hwmon);
+
+ /* set trim temperature offset to value read at startup */
+ hwmon->tjunc_offset = (signed char)hwmon->da9063->t_offset;
+
+ hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
+ "da9063",
+ hwmon, da9063_groups);
+
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+}
+
+static const struct of_device_id da9063_dt_ids[] = {
+ { .compatible = DA9063_DRVNAME_HWMON, },
+ { }
+};
+MODULE_DEVICE_TABLE(of, da9063_dt_ids);
+
+static struct platform_driver da9063_hwmon_driver = {
+ .probe = da9063_hwmon_probe,
+ .driver = {
+ .name = DA9063_DRVNAME_HWMON,
+ .of_match_table = da9063_dt_ids,
+ },
+};
+module_platform_driver(da9063_hwmon_driver);
+
+MODULE_DESCRIPTION("Hardware monitor support device driver for Dialog DA9063");
+MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" DA9063_DRVNAME_HWMON);
diff --git a/include/linux/mfd/da9063/registers.h b/include/linux/mfd/da9063/registers.h
index 6e0f66a2e727..297631ddda39 100644
--- a/include/linux/mfd/da9063/registers.h
+++ b/include/linux/mfd/da9063/registers.h
@@ -512,6 +512,7 @@

/* DA9063_REG_GPIO_0_1 (addr=0x15) */
#define DA9063_GPIO0_PIN_MASK 0x03
+#define DA9063_GPIO0_PIN_MASK_SHIFT 0
#define DA9063_GPIO0_PIN_ADCIN1 0x00
#define DA9063_GPIO0_PIN_GPI 0x01
#define DA9063_GPIO0_PIN_GPO_OD 0x02
@@ -523,6 +524,7 @@
#define DA9063_GPIO0_TYPE_GPO_VDD_IO2 0x04
#define DA9063_GPIO0_NO_WAKEUP 0x08
#define DA9063_GPIO1_PIN_MASK 0x30
+#define DA9063_GPIO1_PIN_MASK_SHIFT 4
#define DA9063_GPIO1_PIN_ADCIN2_COMP 0x00
#define DA9063_GPIO1_PIN_GPI 0x10
#define DA9063_GPIO1_PIN_GPO_OD 0x20
@@ -536,6 +538,7 @@

/* DA9063_REG_GPIO_2_3 (addr=0x16) */
#define DA9063_GPIO2_PIN_MASK 0x03
+#define DA9063_GPIO2_PIN_MASK_SHIFT 0
#define DA9063_GPIO2_PIN_ADCIN3 0x00
#define DA9063_GPIO2_PIN_GPI 0x01
#define DA9063_GPIO2_PIN_GPO_PSS 0x02
@@ -851,6 +854,7 @@
#define DA9063_VSYS_VAL_BASE 0x00

/* DA9063_REG_ADC_RES_L (addr=0x37) */
+#define DA9063_ADC_RES_L_SHIFT 6
#define DA9063_ADC_RES_L_BITS 2
#define DA9063_ADC_RES_L_MASK 0xC0

@@ -1014,6 +1018,36 @@
#define DA9063_GPIO_DIM 0x80
#define DA9063_GPIO_PWM_MASK 0x7F

+/* DA9063_REG_ADC_CFG (addr=0xC9) */
+#define DA9063_REG_ADCIN1_CUR_MASK 0x03
+#define DA9063_REG_ADCIN1_CUR_SHIFT 0
+#define DA9063_ADCIN1_CUR_1UA 0x00
+#define DA9063_ADCIN1_CUR_2UA 0x01
+#define DA9063_ADCIN1_CUR_10UA 0x02
+#define DA9063_ADCIN1_CUR_40UA 0x03
+#define DA9063_REG_ADCIN2_CUR_MASK 0x0C
+#define DA9063_REG_ADCIN2_CUR_SHIFT 2
+#define DA9063_ADCIN2_CUR_1UA 0x00
+#define DA9063_ADCIN2_CUR_2UA 0x01
+#define DA9063_ADCIN2_CUR_10UA 0x02
+#define DA9063_ADCIN2_CUR_40UA 0x03
+#define DA9063_REG_ADCIN3_CUR_MASK 0x10
+#define DA9063_REG_ADCIN3_CUR_SHIFT 4
+#define DA9063_ADCIN3_CUR_10UA 0x00
+#define DA9063_ADCIN3_CUR_40UA 0x01
+#define DA9063_REG_ADCIN1_DEB_MASK 0x20
+#define DA9063_REG_ADCIN1_DEB_SHIFT 5
+#define DA9063_ADCIN1_DEB_OFF 0x00
+#define DA9063_ADCIN1_DEB_ON 0x01
+#define DA9063_REG_ADCIN2_DEB_MASK 0x40
+#define DA9063_REG_ADCIN2_DEB_SHIFT 6
+#define DA9063_ADCIN2_DEB_OFF 0x00
+#define DA9063_ADCIN2_DEB_ON 0x01
+#define DA9063_REG_ADCIN3_DEB_MASK 0x80
+#define DA9063_REG_ADCIN3_DEB_SHIFT 7
+#define DA9063_ADCIN3_DEB_OFF 0x00
+#define DA9063_ADCIN3_DEB_ON 0x01
+
/* DA9063_REG_CONFIG_H (addr=0x10D) */
#define DA9063_PWM_CLK_MASK 0x01
#define DA9063_PWM_CLK_PWM2MHZ 0x00
--
2.32.0
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