1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs.
4 *
5 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
6 * Copyright (C) 2009 Sascha Hauer, Pengutronix
7 */
8
9#include <linux/mfd/mc13xxx.h>
10#include <linux/platform_device.h>
11#include <linux/hwmon-sysfs.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/mod_devicetable.h>
15#include <linux/hwmon.h>
16#include <linux/slab.h>
17#include <linux/init.h>
18#include <linux/err.h>
19
20#define DRIVER_NAME "mc13783-adc"
21
22/* platform device id driver data */
23#define MC13783_ADC_16CHANS 1
24#define MC13783_ADC_BPDIV2 2
25
26struct mc13783_adc_priv {
27 struct mc13xxx *mc13xxx;
28 struct device *hwmon_dev;
29 char name[PLATFORM_NAME_SIZE];
30};
31
32static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
33 char *buf)
34{
35 struct mc13783_adc_priv *priv = dev_get_drvdata(dev);
36
37 return sprintf(buf, "%s\n", priv->name);
38}
39
40static int mc13783_adc_read(struct device *dev,
41 struct device_attribute *devattr, unsigned int *val)
42{
43 struct mc13783_adc_priv *priv = dev_get_drvdata(dev);
44 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
45 unsigned int channel = attr->index;
46 unsigned int sample[4];
47 int ret;
48
49 ret = mc13xxx_adc_do_conversion(priv->mc13xxx,
50 MC13XXX_ADC_MODE_MULT_CHAN,
51 channel, 0, 0, sample);
52 if (ret)
53 return ret;
54
55 /* ADIN7 subchannels */
56 if (channel >= 16)
57 channel = 7;
58
59 channel &= 0x7;
60
61 *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff;
62
63 return 0;
64}
65
66static ssize_t mc13783_adc_bp_show(struct device *dev,
67 struct device_attribute *devattr,
68 char *buf)
69{
70 unsigned val;
71 struct platform_device *pdev = to_platform_device(dev);
72 kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
73 int ret = mc13783_adc_read(dev, devattr, &val);
74
75 if (ret)
76 return ret;
77
78 if (driver_data & MC13783_ADC_BPDIV2)
79 val = DIV_ROUND_CLOSEST(val * 9, 2);
80 else
81 /*
82 * BP (channel 2) reports with offset 2.4V to the actual value
83 * to fit the input range of the ADC. unit = 2.25mV = 9/4 mV.
84 */
85 val = DIV_ROUND_CLOSEST(val * 9, 4) + 2400;
86
87 return sprintf(buf, "%u\n", val);
88}
89
90static ssize_t mc13783_adc_gp_show(struct device *dev,
91 struct device_attribute *devattr,
92 char *buf)
93{
94 unsigned val;
95 int ret = mc13783_adc_read(dev, devattr, &val);
96
97 if (ret)
98 return ret;
99
100 /*
101 * input range is [0, 2.3V], val has 10 bits, so each bit
102 * is worth 9/4 mV.
103 */
104 val = DIV_ROUND_CLOSEST(val * 9, 4);
105
106 return sprintf(buf, "%u\n", val);
107}
108
109static ssize_t mc13783_adc_uid_show(struct device *dev,
110 struct device_attribute *devattr,
111 char *buf)
112{
113 unsigned int val;
114 struct platform_device *pdev = to_platform_device(dev);
115 kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
116 int ret = mc13783_adc_read(dev, devattr, &val);
117
118 if (ret)
119 return ret;
120
121 if (driver_data & MC13783_ADC_BPDIV2)
122 /* MC13892 have 1/2 divider, input range is [0, 4.800V] */
123 val = DIV_ROUND_CLOSEST(val * 4800, 1024);
124 else
125 /* MC13783 have 0.9 divider, input range is [0, 2.555V] */
126 val = DIV_ROUND_CLOSEST(val * 2555, 1024);
127
128 return sprintf(buf, "%u\n", val);
129}
130
131static ssize_t mc13783_adc_temp_show(struct device *dev,
132 struct device_attribute *devattr,
133 char *buf)
134{
135 unsigned int val;
136 struct platform_device *pdev = to_platform_device(dev);
137 kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
138 int ret = mc13783_adc_read(dev, devattr, &val);
139
140 if (ret)
141 return ret;
142
143 if (driver_data & MC13783_ADC_BPDIV2) {
144 /*
145 * MC13892:
146 * Die Temperature Read Out Code at 25C 680
147 * Temperature change per LSB +0.4244C
148 */
149 ret = DIV_ROUND_CLOSEST(-2635920 + val * 4244, 10);
150 } else {
151 /*
152 * MC13783:
153 * Die Temperature Read Out Code at 25C 282
154 * Temperature change per LSB -1.14C
155 */
156 ret = 346480 - 1140 * val;
157 }
158
159 return sprintf(buf, "%d\n", ret);
160}
161
162static DEVICE_ATTR_RO(name);
163static SENSOR_DEVICE_ATTR_RO(in2_input, mc13783_adc_bp, 2);
164static SENSOR_DEVICE_ATTR_RO(in5_input, mc13783_adc_gp, 5);
165static SENSOR_DEVICE_ATTR_RO(in6_input, mc13783_adc_gp, 6);
166static SENSOR_DEVICE_ATTR_RO(in7_input, mc13783_adc_gp, 7);
167static SENSOR_DEVICE_ATTR_RO(in8_input, mc13783_adc_gp, 8);
168static SENSOR_DEVICE_ATTR_RO(in9_input, mc13783_adc_gp, 9);
169static SENSOR_DEVICE_ATTR_RO(in10_input, mc13783_adc_gp, 10);
170static SENSOR_DEVICE_ATTR_RO(in11_input, mc13783_adc_gp, 11);
171static SENSOR_DEVICE_ATTR_RO(in12_input, mc13783_adc_gp, 12);
172static SENSOR_DEVICE_ATTR_RO(in13_input, mc13783_adc_gp, 13);
173static SENSOR_DEVICE_ATTR_RO(in14_input, mc13783_adc_gp, 14);
174static SENSOR_DEVICE_ATTR_RO(in15_input, mc13783_adc_gp, 15);
175static SENSOR_DEVICE_ATTR_RO(in16_input, mc13783_adc_uid, 16);
176static SENSOR_DEVICE_ATTR_RO(temp1_input, mc13783_adc_temp, 17);
177
178static struct attribute *mc13783_attr_base[] = {
179 &dev_attr_name.attr,
180 &sensor_dev_attr_in2_input.dev_attr.attr,
181 &sensor_dev_attr_in5_input.dev_attr.attr,
182 &sensor_dev_attr_in6_input.dev_attr.attr,
183 &sensor_dev_attr_in7_input.dev_attr.attr,
184 &sensor_dev_attr_in16_input.dev_attr.attr,
185 &sensor_dev_attr_temp1_input.dev_attr.attr,
186 NULL
187};
188
189static const struct attribute_group mc13783_group_base = {
190 .attrs = mc13783_attr_base,
191};
192
193/* these are only used if MC13783_ADC_16CHANS is provided in driver data */
194static struct attribute *mc13783_attr_16chans[] = {
195 &sensor_dev_attr_in8_input.dev_attr.attr,
196 &sensor_dev_attr_in9_input.dev_attr.attr,
197 &sensor_dev_attr_in10_input.dev_attr.attr,
198 &sensor_dev_attr_in11_input.dev_attr.attr,
199 NULL
200};
201
202static const struct attribute_group mc13783_group_16chans = {
203 .attrs = mc13783_attr_16chans,
204};
205
206/* last four channels may be occupied by the touchscreen */
207static struct attribute *mc13783_attr_ts[] = {
208 &sensor_dev_attr_in12_input.dev_attr.attr,
209 &sensor_dev_attr_in13_input.dev_attr.attr,
210 &sensor_dev_attr_in14_input.dev_attr.attr,
211 &sensor_dev_attr_in15_input.dev_attr.attr,
212 NULL
213};
214
215static const struct attribute_group mc13783_group_ts = {
216 .attrs = mc13783_attr_ts,
217};
218
219static int mc13783_adc_use_touchscreen(struct platform_device *pdev)
220{
221 struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
222 unsigned flags = mc13xxx_get_flags(priv->mc13xxx);
223
224 return flags & MC13XXX_USE_TOUCHSCREEN;
225}
226
227static int __init mc13783_adc_probe(struct platform_device *pdev)
228{
229 struct mc13783_adc_priv *priv;
230 int ret;
231 const struct platform_device_id *id = platform_get_device_id(pdev);
232 char *dash;
233
234 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
235 if (!priv)
236 return -ENOMEM;
237
238 priv->mc13xxx = dev_get_drvdata(pdev->dev.parent);
239 snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name);
240 dash = strchr(priv->name, '-');
241 if (dash)
242 *dash = '\0';
243
244 platform_set_drvdata(pdev, priv);
245
246 /* Register sysfs hooks */
247 ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base);
248 if (ret)
249 return ret;
250
251 if (id->driver_data & MC13783_ADC_16CHANS) {
252 ret = sysfs_create_group(&pdev->dev.kobj,
253 &mc13783_group_16chans);
254 if (ret)
255 goto out_err_create_16chans;
256 }
257
258 if (!mc13783_adc_use_touchscreen(pdev)) {
259 ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts);
260 if (ret)
261 goto out_err_create_ts;
262 }
263
264 priv->hwmon_dev = hwmon_device_register(&pdev->dev);
265 if (IS_ERR(priv->hwmon_dev)) {
266 ret = PTR_ERR(priv->hwmon_dev);
267 dev_err(&pdev->dev,
268 "hwmon_device_register failed with %d.\n", ret);
269 goto out_err_register;
270 }
271
272 return 0;
273
274out_err_register:
275
276 if (!mc13783_adc_use_touchscreen(pdev))
277 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
278out_err_create_ts:
279
280 if (id->driver_data & MC13783_ADC_16CHANS)
281 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
282out_err_create_16chans:
283
284 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
285 return ret;
286}
287
288static int mc13783_adc_remove(struct platform_device *pdev)
289{
290 struct mc13783_adc_priv *priv = platform_get_drvdata(pdev);
291 kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data;
292
293 hwmon_device_unregister(priv->hwmon_dev);
294
295 if (!mc13783_adc_use_touchscreen(pdev))
296 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts);
297
298 if (driver_data & MC13783_ADC_16CHANS)
299 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans);
300
301 sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base);
302
303 return 0;
304}
305
306static const struct platform_device_id mc13783_adc_idtable[] = {
307 {
308 .name = "mc13783-adc",
309 .driver_data = MC13783_ADC_16CHANS,
310 }, {
311 .name = "mc13892-adc",
312 .driver_data = MC13783_ADC_BPDIV2,
313 }, {
314 /* sentinel */
315 }
316};
317MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable);
318
319static struct platform_driver mc13783_adc_driver = {
320 .remove = mc13783_adc_remove,
321 .driver = {
322 .name = DRIVER_NAME,
323 },
324 .id_table = mc13783_adc_idtable,
325};
326
327module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe);
328
329MODULE_DESCRIPTION("MC13783 ADC driver");
330MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
331MODULE_LICENSE("GPL");
332