1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *
  4 * Copyright (C) 2012 ARM Limited
  5 */
  6
  7#define DRVNAME "vexpress-hwmon"
  8#define pr_fmt(fmt) DRVNAME ": " fmt
  9
 10#include <linux/device.h>
 11#include <linux/err.h>
 12#include <linux/hwmon.h>
 13#include <linux/hwmon-sysfs.h>
 14#include <linux/module.h>
 15#include <linux/of.h>
 16#include <linux/of_device.h>
 17#include <linux/platform_device.h>
 18#include <linux/vexpress.h>
 19
 20struct vexpress_hwmon_data {
 21	struct device *hwmon_dev;
 22	struct regmap *reg;
 23};
 24
 25static ssize_t vexpress_hwmon_label_show(struct device *dev,
 26		struct device_attribute *dev_attr, char *buffer)
 27{
 28	const char *label = of_get_property(dev->of_node, "label", NULL);
 29
 30	return snprintf(buffer, PAGE_SIZE, "%s\n", label);
 31}
 32
 33static ssize_t vexpress_hwmon_u32_show(struct device *dev,
 34		struct device_attribute *dev_attr, char *buffer)
 35{
 36	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
 37	int err;
 38	u32 value;
 39
 40	err = regmap_read(data->reg, 0, &value);
 41	if (err)
 42		return err;
 43
 44	return snprintf(buffer, PAGE_SIZE, "%u\n", value /
 45			to_sensor_dev_attr(dev_attr)->index);
 46}
 47
 48static ssize_t vexpress_hwmon_u64_show(struct device *dev,
 49		struct device_attribute *dev_attr, char *buffer)
 50{
 51	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
 52	int err;
 53	u32 value_hi, value_lo;
 54
 55	err = regmap_read(data->reg, 0, &value_lo);
 56	if (err)
 57		return err;
 58
 59	err = regmap_read(data->reg, 1, &value_hi);
 60	if (err)
 61		return err;
 62
 63	return snprintf(buffer, PAGE_SIZE, "%llu\n",
 64			div_u64(((u64)value_hi << 32) | value_lo,
 65			to_sensor_dev_attr(dev_attr)->index));
 66}
 67
 68static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
 69		struct attribute *attr, int index)
 70{
 71	struct device *dev = kobj_to_dev(kobj);
 72	struct device_attribute *dev_attr = container_of(attr,
 73				struct device_attribute, attr);
 74
 75	if (dev_attr->show == vexpress_hwmon_label_show &&
 76			!of_get_property(dev->of_node, "label", NULL))
 77		return 0;
 78
 79	return attr->mode;
 80}
 81
 82struct vexpress_hwmon_type {
 83	const char *name;
 84	const struct attribute_group **attr_groups;
 85};
 86
 87#if !defined(CONFIG_REGULATOR_VEXPRESS)
 88static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL);
 89static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000);
 90static struct attribute *vexpress_hwmon_attrs_volt[] = {
 91	&dev_attr_in1_label.attr,
 92	&sensor_dev_attr_in1_input.dev_attr.attr,
 93	NULL
 94};
 95static struct attribute_group vexpress_hwmon_group_volt = {
 96	.is_visible = vexpress_hwmon_attr_is_visible,
 97	.attrs = vexpress_hwmon_attrs_volt,
 98};
 99static struct vexpress_hwmon_type vexpress_hwmon_volt = {
100	.name = "vexpress_volt",
101	.attr_groups = (const struct attribute_group *[]) {
102		&vexpress_hwmon_group_volt,
103		NULL,
104	},
105};
106#endif
107
108static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL);
109static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000);
110static struct attribute *vexpress_hwmon_attrs_amp[] = {
111	&dev_attr_curr1_label.attr,
112	&sensor_dev_attr_curr1_input.dev_attr.attr,
113	NULL
114};
115static struct attribute_group vexpress_hwmon_group_amp = {
116	.is_visible = vexpress_hwmon_attr_is_visible,
117	.attrs = vexpress_hwmon_attrs_amp,
118};
119static struct vexpress_hwmon_type vexpress_hwmon_amp = {
120	.name = "vexpress_amp",
121	.attr_groups = (const struct attribute_group *[]) {
122		&vexpress_hwmon_group_amp,
123		NULL
124	},
125};
126
127static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL);
128static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000);
129static struct attribute *vexpress_hwmon_attrs_temp[] = {
130	&dev_attr_temp1_label.attr,
131	&sensor_dev_attr_temp1_input.dev_attr.attr,
132	NULL
133};
134static struct attribute_group vexpress_hwmon_group_temp = {
135	.is_visible = vexpress_hwmon_attr_is_visible,
136	.attrs = vexpress_hwmon_attrs_temp,
137};
138static struct vexpress_hwmon_type vexpress_hwmon_temp = {
139	.name = "vexpress_temp",
140	.attr_groups = (const struct attribute_group *[]) {
141		&vexpress_hwmon_group_temp,
142		NULL
143	},
144};
145
146static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL);
147static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1);
148static struct attribute *vexpress_hwmon_attrs_power[] = {
149	&dev_attr_power1_label.attr,
150	&sensor_dev_attr_power1_input.dev_attr.attr,
151	NULL
152};
153static struct attribute_group vexpress_hwmon_group_power = {
154	.is_visible = vexpress_hwmon_attr_is_visible,
155	.attrs = vexpress_hwmon_attrs_power,
156};
157static struct vexpress_hwmon_type vexpress_hwmon_power = {
158	.name = "vexpress_power",
159	.attr_groups = (const struct attribute_group *[]) {
160		&vexpress_hwmon_group_power,
161		NULL
162	},
163};
164
165static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL);
166static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1);
167static struct attribute *vexpress_hwmon_attrs_energy[] = {
168	&dev_attr_energy1_label.attr,
169	&sensor_dev_attr_energy1_input.dev_attr.attr,
170	NULL
171};
172static struct attribute_group vexpress_hwmon_group_energy = {
173	.is_visible = vexpress_hwmon_attr_is_visible,
174	.attrs = vexpress_hwmon_attrs_energy,
175};
176static struct vexpress_hwmon_type vexpress_hwmon_energy = {
177	.name = "vexpress_energy",
178	.attr_groups = (const struct attribute_group *[]) {
179		&vexpress_hwmon_group_energy,
180		NULL
181	},
182};
183
184static const struct of_device_id vexpress_hwmon_of_match[] = {
185#if !defined(CONFIG_REGULATOR_VEXPRESS)
186	{
187		.compatible = "arm,vexpress-volt",
188		.data = &vexpress_hwmon_volt,
189	},
190#endif
191	{
192		.compatible = "arm,vexpress-amp",
193		.data = &vexpress_hwmon_amp,
194	}, {
195		.compatible = "arm,vexpress-temp",
196		.data = &vexpress_hwmon_temp,
197	}, {
198		.compatible = "arm,vexpress-power",
199		.data = &vexpress_hwmon_power,
200	}, {
201		.compatible = "arm,vexpress-energy",
202		.data = &vexpress_hwmon_energy,
203	},
204	{}
205};
206MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
207
208static int vexpress_hwmon_probe(struct platform_device *pdev)
209{
210	const struct of_device_id *match;
211	struct vexpress_hwmon_data *data;
212	const struct vexpress_hwmon_type *type;
213
214	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
215	if (!data)
216		return -ENOMEM;
217	platform_set_drvdata(pdev, data);
218
219	match = of_match_device(vexpress_hwmon_of_match, &pdev->dev);
220	if (!match)
221		return -ENODEV;
222	type = match->data;
223
224	data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
225	if (IS_ERR(data->reg))
226		return PTR_ERR(data->reg);
227
228	data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
229			type->name, data, type->attr_groups);
230
231	return PTR_ERR_OR_ZERO(data->hwmon_dev);
232}
233
234static struct platform_driver vexpress_hwmon_driver = {
235	.probe = vexpress_hwmon_probe,
236	.driver	= {
237		.name = DRVNAME,
238		.of_match_table = vexpress_hwmon_of_match,
239	},
240};
241
242module_platform_driver(vexpress_hwmon_driver);
243
244MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
245MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
246MODULE_LICENSE("GPL");
247MODULE_ALIAS("platform:vexpress-hwmon");

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *
  4 * Copyright (C) 2012 ARM Limited
  5 */
  6
  7#define DRVNAME "vexpress-hwmon"
  8#define pr_fmt(fmt) DRVNAME ": " fmt
  9
 10#include <linux/device.h>
 11#include <linux/err.h>
 12#include <linux/hwmon.h>
 13#include <linux/hwmon-sysfs.h>
 14#include <linux/module.h>
 15#include <linux/of.h>
 16#include <linux/of_device.h>
 17#include <linux/platform_device.h>
 18#include <linux/vexpress.h>
 19
 20struct vexpress_hwmon_data {
 21	struct device *hwmon_dev;
 22	struct regmap *reg;
 23};
 24
 25static ssize_t vexpress_hwmon_label_show(struct device *dev,
 26		struct device_attribute *dev_attr, char *buffer)
 27{
 28	const char *label = of_get_property(dev->of_node, "label", NULL);
 29
 30	return sysfs_emit(buffer, "%s\n", label);
 31}
 32
 33static ssize_t vexpress_hwmon_u32_show(struct device *dev,
 34		struct device_attribute *dev_attr, char *buffer)
 35{
 36	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
 37	int err;
 38	u32 value;
 39
 40	err = regmap_read(data->reg, 0, &value);
 41	if (err)
 42		return err;
 43
 44	return sysfs_emit(buffer, "%u\n", value /
 45			  to_sensor_dev_attr(dev_attr)->index);
 46}
 47
 48static ssize_t vexpress_hwmon_u64_show(struct device *dev,
 49		struct device_attribute *dev_attr, char *buffer)
 50{
 51	struct vexpress_hwmon_data *data = dev_get_drvdata(dev);
 52	int err;
 53	u32 value_hi, value_lo;
 54
 55	err = regmap_read(data->reg, 0, &value_lo);
 56	if (err)
 57		return err;
 58
 59	err = regmap_read(data->reg, 1, &value_hi);
 60	if (err)
 61		return err;
 62
 63	return sysfs_emit(buffer, "%llu\n",
 64			  div_u64(((u64)value_hi << 32) | value_lo,
 65				  to_sensor_dev_attr(dev_attr)->index));
 66}
 67
 68static umode_t vexpress_hwmon_attr_is_visible(struct kobject *kobj,
 69		struct attribute *attr, int index)
 70{
 71	struct device *dev = kobj_to_dev(kobj);
 72	struct device_attribute *dev_attr = container_of(attr,
 73				struct device_attribute, attr);
 74
 75	if (dev_attr->show == vexpress_hwmon_label_show &&
 76			!of_get_property(dev->of_node, "label", NULL))
 77		return 0;
 78
 79	return attr->mode;
 80}
 81
 82struct vexpress_hwmon_type {
 83	const char *name;
 84	const struct attribute_group **attr_groups;
 85};
 86
 87#if !defined(CONFIG_REGULATOR_VEXPRESS)
 88static DEVICE_ATTR(in1_label, 0444, vexpress_hwmon_label_show, NULL);
 89static SENSOR_DEVICE_ATTR_RO(in1_input, vexpress_hwmon_u32, 1000);
 90static struct attribute *vexpress_hwmon_attrs_volt[] = {
 91	&dev_attr_in1_label.attr,
 92	&sensor_dev_attr_in1_input.dev_attr.attr,
 93	NULL
 94};
 95static struct attribute_group vexpress_hwmon_group_volt = {
 96	.is_visible = vexpress_hwmon_attr_is_visible,
 97	.attrs = vexpress_hwmon_attrs_volt,
 98};
 99static struct vexpress_hwmon_type vexpress_hwmon_volt = {
100	.name = "vexpress_volt",
101	.attr_groups = (const struct attribute_group *[]) {
102		&vexpress_hwmon_group_volt,
103		NULL,
104	},
105};
106#endif
107
108static DEVICE_ATTR(curr1_label, 0444, vexpress_hwmon_label_show, NULL);
109static SENSOR_DEVICE_ATTR_RO(curr1_input, vexpress_hwmon_u32, 1000);
110static struct attribute *vexpress_hwmon_attrs_amp[] = {
111	&dev_attr_curr1_label.attr,
112	&sensor_dev_attr_curr1_input.dev_attr.attr,
113	NULL
114};
115static struct attribute_group vexpress_hwmon_group_amp = {
116	.is_visible = vexpress_hwmon_attr_is_visible,
117	.attrs = vexpress_hwmon_attrs_amp,
118};
119static struct vexpress_hwmon_type vexpress_hwmon_amp = {
120	.name = "vexpress_amp",
121	.attr_groups = (const struct attribute_group *[]) {
122		&vexpress_hwmon_group_amp,
123		NULL
124	},
125};
126
127static DEVICE_ATTR(temp1_label, 0444, vexpress_hwmon_label_show, NULL);
128static SENSOR_DEVICE_ATTR_RO(temp1_input, vexpress_hwmon_u32, 1000);
129static struct attribute *vexpress_hwmon_attrs_temp[] = {
130	&dev_attr_temp1_label.attr,
131	&sensor_dev_attr_temp1_input.dev_attr.attr,
132	NULL
133};
134static struct attribute_group vexpress_hwmon_group_temp = {
135	.is_visible = vexpress_hwmon_attr_is_visible,
136	.attrs = vexpress_hwmon_attrs_temp,
137};
138static struct vexpress_hwmon_type vexpress_hwmon_temp = {
139	.name = "vexpress_temp",
140	.attr_groups = (const struct attribute_group *[]) {
141		&vexpress_hwmon_group_temp,
142		NULL
143	},
144};
145
146static DEVICE_ATTR(power1_label, 0444, vexpress_hwmon_label_show, NULL);
147static SENSOR_DEVICE_ATTR_RO(power1_input, vexpress_hwmon_u32, 1);
148static struct attribute *vexpress_hwmon_attrs_power[] = {
149	&dev_attr_power1_label.attr,
150	&sensor_dev_attr_power1_input.dev_attr.attr,
151	NULL
152};
153static struct attribute_group vexpress_hwmon_group_power = {
154	.is_visible = vexpress_hwmon_attr_is_visible,
155	.attrs = vexpress_hwmon_attrs_power,
156};
157static struct vexpress_hwmon_type vexpress_hwmon_power = {
158	.name = "vexpress_power",
159	.attr_groups = (const struct attribute_group *[]) {
160		&vexpress_hwmon_group_power,
161		NULL
162	},
163};
164
165static DEVICE_ATTR(energy1_label, 0444, vexpress_hwmon_label_show, NULL);
166static SENSOR_DEVICE_ATTR_RO(energy1_input, vexpress_hwmon_u64, 1);
167static struct attribute *vexpress_hwmon_attrs_energy[] = {
168	&dev_attr_energy1_label.attr,
169	&sensor_dev_attr_energy1_input.dev_attr.attr,
170	NULL
171};
172static struct attribute_group vexpress_hwmon_group_energy = {
173	.is_visible = vexpress_hwmon_attr_is_visible,
174	.attrs = vexpress_hwmon_attrs_energy,
175};
176static struct vexpress_hwmon_type vexpress_hwmon_energy = {
177	.name = "vexpress_energy",
178	.attr_groups = (const struct attribute_group *[]) {
179		&vexpress_hwmon_group_energy,
180		NULL
181	},
182};
183
184static const struct of_device_id vexpress_hwmon_of_match[] = {
185#if !defined(CONFIG_REGULATOR_VEXPRESS)
186	{
187		.compatible = "arm,vexpress-volt",
188		.data = &vexpress_hwmon_volt,
189	},
190#endif
191	{
192		.compatible = "arm,vexpress-amp",
193		.data = &vexpress_hwmon_amp,
194	}, {
195		.compatible = "arm,vexpress-temp",
196		.data = &vexpress_hwmon_temp,
197	}, {
198		.compatible = "arm,vexpress-power",
199		.data = &vexpress_hwmon_power,
200	}, {
201		.compatible = "arm,vexpress-energy",
202		.data = &vexpress_hwmon_energy,
203	},
204	{}
205};
206MODULE_DEVICE_TABLE(of, vexpress_hwmon_of_match);
207
208static int vexpress_hwmon_probe(struct platform_device *pdev)
209{
 
210	struct vexpress_hwmon_data *data;
211	const struct vexpress_hwmon_type *type;
212
213	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
214	if (!data)
215		return -ENOMEM;
216	platform_set_drvdata(pdev, data);
217
218	type = of_device_get_match_data(&pdev->dev);
219	if (!type)
220		return -ENODEV;
 
221
222	data->reg = devm_regmap_init_vexpress_config(&pdev->dev);
223	if (IS_ERR(data->reg))
224		return PTR_ERR(data->reg);
225
226	data->hwmon_dev = devm_hwmon_device_register_with_groups(&pdev->dev,
227			type->name, data, type->attr_groups);
228
229	return PTR_ERR_OR_ZERO(data->hwmon_dev);
230}
231
232static struct platform_driver vexpress_hwmon_driver = {
233	.probe = vexpress_hwmon_probe,
234	.driver	= {
235		.name = DRVNAME,
236		.of_match_table = vexpress_hwmon_of_match,
237	},
238};
239
240module_platform_driver(vexpress_hwmon_driver);
241
242MODULE_AUTHOR("Pawel Moll <pawel.moll@arm.com>");
243MODULE_DESCRIPTION("Versatile Express hwmon sensors driver");
244MODULE_LICENSE("GPL");
245MODULE_ALIAS("platform:vexpress-hwmon");