1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * HWMON Driver for Dialog DA9055
4 *
5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
6 *
7 * Author: David Dajun Chen <dchen@diasemi.com>
8 */
9
10#include <linux/delay.h>
11#include <linux/err.h>
12#include <linux/hwmon.h>
13#include <linux/hwmon-sysfs.h>
14#include <linux/init.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/completion.h>
19
20#include <linux/mfd/da9055/core.h>
21#include <linux/mfd/da9055/reg.h>
22
23#define DA9055_ADCIN_DIV	102
24#define DA9055_VSYS_DIV	85
25
26#define DA9055_ADC_VSYS	0
27#define DA9055_ADC_ADCIN1	1
28#define DA9055_ADC_ADCIN2	2
29#define DA9055_ADC_ADCIN3	3
30#define DA9055_ADC_TJUNC	4
31
32struct da9055_hwmon {
33	struct da9055	*da9055;
34	struct mutex	hwmon_lock;
35	struct mutex	irq_lock;
36	struct completion done;
37};
38
39static const char * const input_names[] = {
40	[DA9055_ADC_VSYS]	= "VSYS",
41	[DA9055_ADC_ADCIN1]	= "ADC IN1",
42	[DA9055_ADC_ADCIN2]	= "ADC IN2",
43	[DA9055_ADC_ADCIN3]	= "ADC IN3",
44	[DA9055_ADC_TJUNC]	= "CHIP TEMP",
45};
46
47static const u8 chan_mux[DA9055_ADC_TJUNC + 1] = {
48	[DA9055_ADC_VSYS]	= DA9055_ADC_MUX_VSYS,
49	[DA9055_ADC_ADCIN1]	= DA9055_ADC_MUX_ADCIN1,
50	[DA9055_ADC_ADCIN2]	= DA9055_ADC_MUX_ADCIN2,
51	[DA9055_ADC_ADCIN3]	= DA9055_ADC_MUX_ADCIN3,
52	[DA9055_ADC_TJUNC]	= DA9055_ADC_MUX_T_SENSE,
53};
54
55static int da9055_adc_manual_read(struct da9055_hwmon *hwmon,
56					unsigned char channel)
57{
58	int ret;
59	unsigned short calc_data;
60	unsigned short data;
61	unsigned char mux_sel;
62	struct da9055 *da9055 = hwmon->da9055;
63
64	if (channel > DA9055_ADC_TJUNC)
65		return -EINVAL;
66
67	mutex_lock(&hwmon->irq_lock);
68
69	/* Selects desired MUX for manual conversion */
70	mux_sel = chan_mux[channel] | DA9055_ADC_MAN_CONV;
71
72	ret = da9055_reg_write(da9055, DA9055_REG_ADC_MAN, mux_sel);
73	if (ret < 0)
74		goto err;
75
76	/* Wait for an interrupt */
77	if (!wait_for_completion_timeout(&hwmon->done,
78					msecs_to_jiffies(500))) {
79		dev_err(da9055->dev,
80			"timeout waiting for ADC conversion interrupt\n");
81		ret = -ETIMEDOUT;
82		goto err;
83	}
84
85	ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_H);
86	if (ret < 0)
87		goto err;
88
89	calc_data = (unsigned short)ret;
90	data = calc_data << 2;
91
92	ret = da9055_reg_read(da9055, DA9055_REG_ADC_RES_L);
93	if (ret < 0)
94		goto err;
95
96	calc_data = (unsigned short)(ret & DA9055_ADC_LSB_MASK);
97	data |= calc_data;
98
99	ret = data;
100
101err:
102	mutex_unlock(&hwmon->irq_lock);
103	return ret;
104}
105
106static irqreturn_t da9055_auxadc_irq(int irq, void *irq_data)
107{
108	struct da9055_hwmon *hwmon = irq_data;
109
110	complete(&hwmon->done);
111
112	return IRQ_HANDLED;
113}
114
115/* Conversion function for VSYS and ADCINx */
116static inline int volt_reg_to_mv(int value, int channel)
117{
118	if (channel == DA9055_ADC_VSYS)
119		return DIV_ROUND_CLOSEST(value * 1000, DA9055_VSYS_DIV) + 2500;
120	else
121		return DIV_ROUND_CLOSEST(value * 1000, DA9055_ADCIN_DIV);
122}
123
124static int da9055_enable_auto_mode(struct da9055 *da9055, int channel)
125{
126
127	return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel,
128				1 << channel);
129
130}
131
132static int da9055_disable_auto_mode(struct da9055 *da9055, int channel)
133{
134
135	return da9055_reg_update(da9055, DA9055_REG_ADC_CONT, 1 << channel, 0);
136}
137
138static ssize_t da9055_auto_ch_show(struct device *dev,
139				   struct device_attribute *devattr,
140				   char *buf)
141{
142	struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
143	int ret, adc;
144	int channel = to_sensor_dev_attr(devattr)->index;
145
146	mutex_lock(&hwmon->hwmon_lock);
147
148	ret = da9055_enable_auto_mode(hwmon->da9055, channel);
149	if (ret < 0)
150		goto hwmon_err;
151
152	usleep_range(10000, 10500);
153
154	adc = da9055_reg_read(hwmon->da9055, DA9055_REG_VSYS_RES + channel);
155	if (adc < 0) {
156		ret = adc;
157		goto hwmon_err_release;
158	}
159
160	ret = da9055_disable_auto_mode(hwmon->da9055, channel);
161	if (ret < 0)
162		goto hwmon_err;
163
164	mutex_unlock(&hwmon->hwmon_lock);
165
166	return sprintf(buf, "%d\n", volt_reg_to_mv(adc, channel));
167
168hwmon_err_release:
169	da9055_disable_auto_mode(hwmon->da9055, channel);
170hwmon_err:
171	mutex_unlock(&hwmon->hwmon_lock);
172	return ret;
173}
174
175static ssize_t da9055_tjunc_show(struct device *dev,
176				 struct device_attribute *devattr, char *buf)
177{
178	struct da9055_hwmon *hwmon = dev_get_drvdata(dev);
179	int tjunc;
180	int toffset;
181
182	tjunc = da9055_adc_manual_read(hwmon, DA9055_ADC_TJUNC);
183	if (tjunc < 0)
184		return tjunc;
185
186	toffset = da9055_reg_read(hwmon->da9055, DA9055_REG_T_OFFSET);
187	if (toffset < 0)
188		return toffset;
189
190	/*
191	 * Degrees celsius = -0.4084 * (ADC_RES - T_OFFSET) + 307.6332
192	 * T_OFFSET is a trim value used to improve accuracy of the result
193	 */
194	return sprintf(buf, "%d\n", DIV_ROUND_CLOSEST(-4084 * (tjunc - toffset)
195							+ 3076332, 10000));
196}
197
198static ssize_t label_show(struct device *dev,
199			  struct device_attribute *devattr, char *buf)
200{
201	return sprintf(buf, "%s\n",
202		       input_names[to_sensor_dev_attr(devattr)->index]);
203}
204
205static SENSOR_DEVICE_ATTR_RO(in0_input, da9055_auto_ch, DA9055_ADC_VSYS);
206static SENSOR_DEVICE_ATTR_RO(in0_label, label, DA9055_ADC_VSYS);
207static SENSOR_DEVICE_ATTR_RO(in1_input, da9055_auto_ch, DA9055_ADC_ADCIN1);
208static SENSOR_DEVICE_ATTR_RO(in1_label, label, DA9055_ADC_ADCIN1);
209static SENSOR_DEVICE_ATTR_RO(in2_input, da9055_auto_ch, DA9055_ADC_ADCIN2);
210static SENSOR_DEVICE_ATTR_RO(in2_label, label, DA9055_ADC_ADCIN2);
211static SENSOR_DEVICE_ATTR_RO(in3_input, da9055_auto_ch, DA9055_ADC_ADCIN3);
212static SENSOR_DEVICE_ATTR_RO(in3_label, label, DA9055_ADC_ADCIN3);
213
214static SENSOR_DEVICE_ATTR_RO(temp1_input, da9055_tjunc, DA9055_ADC_TJUNC);
215static SENSOR_DEVICE_ATTR_RO(temp1_label, label, DA9055_ADC_TJUNC);
216
217static struct attribute *da9055_attrs[] = {
218	&sensor_dev_attr_in0_input.dev_attr.attr,
219	&sensor_dev_attr_in0_label.dev_attr.attr,
220	&sensor_dev_attr_in1_input.dev_attr.attr,
221	&sensor_dev_attr_in1_label.dev_attr.attr,
222	&sensor_dev_attr_in2_input.dev_attr.attr,
223	&sensor_dev_attr_in2_label.dev_attr.attr,
224	&sensor_dev_attr_in3_input.dev_attr.attr,
225	&sensor_dev_attr_in3_label.dev_attr.attr,
226
227	&sensor_dev_attr_temp1_input.dev_attr.attr,
228	&sensor_dev_attr_temp1_label.dev_attr.attr,
229	NULL
230};
231
232ATTRIBUTE_GROUPS(da9055);
233
234static int da9055_hwmon_probe(struct platform_device *pdev)
235{
236	struct device *dev = &pdev->dev;
237	struct da9055_hwmon *hwmon;
238	struct device *hwmon_dev;
239	int hwmon_irq, ret;
240
241	hwmon = devm_kzalloc(dev, sizeof(struct da9055_hwmon), GFP_KERNEL);
242	if (!hwmon)
243		return -ENOMEM;
244
245	mutex_init(&hwmon->hwmon_lock);
246	mutex_init(&hwmon->irq_lock);
247
248	init_completion(&hwmon->done);
249	hwmon->da9055 = dev_get_drvdata(pdev->dev.parent);
250
251	hwmon_irq = platform_get_irq_byname(pdev, "HWMON");
252	if (hwmon_irq < 0)
253		return hwmon_irq;
254
255	ret = devm_request_threaded_irq(&pdev->dev, hwmon_irq,
256					NULL, da9055_auxadc_irq,
257					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
258					"adc-irq", hwmon);
259	if (ret != 0) {
260		dev_err(hwmon->da9055->dev, "DA9055 ADC IRQ failed ret=%d\n",
261			ret);
262		return ret;
263	}
264
265	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9055",
266							   hwmon,
267							   da9055_groups);
268	return PTR_ERR_OR_ZERO(hwmon_dev);
269}
270
271static struct platform_driver da9055_hwmon_driver = {
272	.probe = da9055_hwmon_probe,
273	.driver = {
274		.name = "da9055-hwmon",
275	},
276};
277
278module_platform_driver(da9055_hwmon_driver);
279
280MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
281MODULE_DESCRIPTION("DA9055 HWMON driver");
282MODULE_LICENSE("GPL");
283MODULE_ALIAS("platform:da9055-hwmon");
284