Commit | Line | Data |
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9450f52c | 1 | // SPDX-License-Identifier: GPL-2.0+ |
93ee0a75 | 2 | /* |
0c273215 | 3 | * Driver for the ADC on Freescale Semiconductor MC13783 and MC13892 PMICs. |
93ee0a75 LF |
4 | * |
5 | * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. | |
6 | * Copyright (C) 2009 Sascha Hauer, Pengutronix | |
93ee0a75 LF |
7 | */ |
8 | ||
0c273215 | 9 | #include <linux/mfd/mc13xxx.h> |
93ee0a75 LF |
10 | #include <linux/platform_device.h> |
11 | #include <linux/hwmon-sysfs.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
ac316725 | 14 | #include <linux/mod_devicetable.h> |
93ee0a75 | 15 | #include <linux/hwmon.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
93ee0a75 LF |
17 | #include <linux/init.h> |
18 | #include <linux/err.h> | |
19 | ||
0c273215 UKK |
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 | |
93ee0a75 LF |
25 | |
26 | struct mc13783_adc_priv { | |
613c27ab | 27 | struct mc13xxx *mc13xxx; |
93ee0a75 | 28 | struct device *hwmon_dev; |
ae02e741 | 29 | char name[PLATFORM_NAME_SIZE]; |
93ee0a75 LF |
30 | }; |
31 | ||
918b4056 JL |
32 | static ssize_t name_show(struct device *dev, struct device_attribute *devattr, |
33 | char *buf) | |
93ee0a75 | 34 | { |
0c273215 UKK |
35 | struct mc13783_adc_priv *priv = dev_get_drvdata(dev); |
36 | ||
37 | return sprintf(buf, "%s\n", priv->name); | |
93ee0a75 LF |
38 | } |
39 | ||
40 | static int mc13783_adc_read(struct device *dev, | |
41 | struct device_attribute *devattr, unsigned int *val) | |
42 | { | |
0c273215 | 43 | struct mc13783_adc_priv *priv = dev_get_drvdata(dev); |
93ee0a75 LF |
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 | ||
613c27ab UKK |
49 | ret = mc13xxx_adc_do_conversion(priv->mc13xxx, |
50 | MC13XXX_ADC_MODE_MULT_CHAN, | |
1039d762 | 51 | channel, 0, 0, sample); |
93ee0a75 LF |
52 | if (ret) |
53 | return ret; | |
54 | ||
ed645ccc AG |
55 | /* ADIN7 subchannels */ |
56 | if (channel >= 16) | |
57 | channel = 7; | |
58 | ||
93ee0a75 LF |
59 | channel &= 0x7; |
60 | ||
61 | *val = (sample[channel % 4] >> (channel > 3 ? 14 : 2)) & 0x3ff; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | ||
6d190949 GR |
66 | static ssize_t mc13783_adc_bp_show(struct device *dev, |
67 | struct device_attribute *devattr, | |
68 | char *buf) | |
93ee0a75 LF |
69 | { |
70 | unsigned val; | |
0c273215 UKK |
71 | struct platform_device *pdev = to_platform_device(dev); |
72 | kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; | |
93ee0a75 LF |
73 | int ret = mc13783_adc_read(dev, devattr, &val); |
74 | ||
75 | if (ret) | |
76 | return ret; | |
77 | ||
0c273215 UKK |
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; | |
93ee0a75 LF |
86 | |
87 | return sprintf(buf, "%u\n", val); | |
88 | } | |
89 | ||
6d190949 GR |
90 | static ssize_t mc13783_adc_gp_show(struct device *dev, |
91 | struct device_attribute *devattr, | |
92 | char *buf) | |
93ee0a75 LF |
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 | ||
6d190949 GR |
109 | static ssize_t mc13783_adc_uid_show(struct device *dev, |
110 | struct device_attribute *devattr, | |
111 | char *buf) | |
ed645ccc AG |
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 | ||
6d190949 GR |
131 | static ssize_t mc13783_adc_temp_show(struct device *dev, |
132 | struct device_attribute *devattr, | |
133 | char *buf) | |
ed645ccc AG |
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 | ||
918b4056 | 162 | static DEVICE_ATTR_RO(name); |
6d190949 GR |
163 | static SENSOR_DEVICE_ATTR_RO(in2_input, mc13783_adc_bp, 2); |
164 | static SENSOR_DEVICE_ATTR_RO(in5_input, mc13783_adc_gp, 5); | |
165 | static SENSOR_DEVICE_ATTR_RO(in6_input, mc13783_adc_gp, 6); | |
166 | static SENSOR_DEVICE_ATTR_RO(in7_input, mc13783_adc_gp, 7); | |
167 | static SENSOR_DEVICE_ATTR_RO(in8_input, mc13783_adc_gp, 8); | |
168 | static SENSOR_DEVICE_ATTR_RO(in9_input, mc13783_adc_gp, 9); | |
169 | static SENSOR_DEVICE_ATTR_RO(in10_input, mc13783_adc_gp, 10); | |
170 | static SENSOR_DEVICE_ATTR_RO(in11_input, mc13783_adc_gp, 11); | |
171 | static SENSOR_DEVICE_ATTR_RO(in12_input, mc13783_adc_gp, 12); | |
172 | static SENSOR_DEVICE_ATTR_RO(in13_input, mc13783_adc_gp, 13); | |
173 | static SENSOR_DEVICE_ATTR_RO(in14_input, mc13783_adc_gp, 14); | |
174 | static SENSOR_DEVICE_ATTR_RO(in15_input, mc13783_adc_gp, 15); | |
175 | static SENSOR_DEVICE_ATTR_RO(in16_input, mc13783_adc_uid, 16); | |
176 | static SENSOR_DEVICE_ATTR_RO(temp1_input, mc13783_adc_temp, 17); | |
93ee0a75 | 177 | |
0c273215 | 178 | static struct attribute *mc13783_attr_base[] = { |
93ee0a75 LF |
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, | |
ed645ccc AG |
184 | &sensor_dev_attr_in16_input.dev_attr.attr, |
185 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
0c273215 UKK |
186 | NULL |
187 | }; | |
188 | ||
189 | static 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 */ | |
194 | static struct attribute *mc13783_attr_16chans[] = { | |
93ee0a75 LF |
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 | ||
0c273215 UKK |
202 | static const struct attribute_group mc13783_group_16chans = { |
203 | .attrs = mc13783_attr_16chans, | |
93ee0a75 LF |
204 | }; |
205 | ||
206 | /* last four channels may be occupied by the touchscreen */ | |
207 | static 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 | ||
215 | static const struct attribute_group mc13783_group_ts = { | |
216 | .attrs = mc13783_attr_ts, | |
217 | }; | |
218 | ||
eaf06ee2 UKK |
219 | static int mc13783_adc_use_touchscreen(struct platform_device *pdev) |
220 | { | |
221 | struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); | |
613c27ab | 222 | unsigned flags = mc13xxx_get_flags(priv->mc13xxx); |
eaf06ee2 | 223 | |
613c27ab | 224 | return flags & MC13XXX_USE_TOUCHSCREEN; |
eaf06ee2 UKK |
225 | } |
226 | ||
93ee0a75 LF |
227 | static int __init mc13783_adc_probe(struct platform_device *pdev) |
228 | { | |
229 | struct mc13783_adc_priv *priv; | |
230 | int ret; | |
0c273215 UKK |
231 | const struct platform_device_id *id = platform_get_device_id(pdev); |
232 | char *dash; | |
93ee0a75 | 233 | |
ed2e073b | 234 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
93ee0a75 LF |
235 | if (!priv) |
236 | return -ENOMEM; | |
237 | ||
613c27ab | 238 | priv->mc13xxx = dev_get_drvdata(pdev->dev.parent); |
0c273215 UKK |
239 | snprintf(priv->name, ARRAY_SIZE(priv->name), "%s", id->name); |
240 | dash = strchr(priv->name, '-'); | |
241 | if (dash) | |
242 | *dash = '\0'; | |
93ee0a75 LF |
243 | |
244 | platform_set_drvdata(pdev, priv); | |
245 | ||
246 | /* Register sysfs hooks */ | |
0c273215 | 247 | ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_base); |
93ee0a75 | 248 | if (ret) |
ed2e073b | 249 | return ret; |
0c273215 UKK |
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 | } | |
93ee0a75 | 257 | |
eaf06ee2 | 258 | if (!mc13783_adc_use_touchscreen(pdev)) { |
93ee0a75 LF |
259 | ret = sysfs_create_group(&pdev->dev.kobj, &mc13783_group_ts); |
260 | if (ret) | |
0c273215 | 261 | goto out_err_create_ts; |
eaf06ee2 | 262 | } |
93ee0a75 LF |
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 | ||
93ee0a75 LF |
272 | return 0; |
273 | ||
274 | out_err_register: | |
275 | ||
eaf06ee2 | 276 | if (!mc13783_adc_use_touchscreen(pdev)) |
93ee0a75 | 277 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); |
0c273215 | 278 | out_err_create_ts: |
93ee0a75 | 279 | |
0c273215 UKK |
280 | if (id->driver_data & MC13783_ADC_16CHANS) |
281 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_16chans); | |
282 | out_err_create_16chans: | |
283 | ||
284 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_base); | |
93ee0a75 LF |
285 | return ret; |
286 | } | |
287 | ||
281dfd0b | 288 | static int mc13783_adc_remove(struct platform_device *pdev) |
93ee0a75 LF |
289 | { |
290 | struct mc13783_adc_priv *priv = platform_get_drvdata(pdev); | |
0c273215 | 291 | kernel_ulong_t driver_data = platform_get_device_id(pdev)->driver_data; |
93ee0a75 LF |
292 | |
293 | hwmon_device_unregister(priv->hwmon_dev); | |
294 | ||
eaf06ee2 | 295 | if (!mc13783_adc_use_touchscreen(pdev)) |
93ee0a75 LF |
296 | sysfs_remove_group(&pdev->dev.kobj, &mc13783_group_ts); |
297 | ||
0c273215 UKK |
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); | |
93ee0a75 | 302 | |
93ee0a75 LF |
303 | return 0; |
304 | } | |
305 | ||
0c273215 UKK |
306 | static 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 | }; | |
317 | MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable); | |
318 | ||
93ee0a75 | 319 | static struct platform_driver mc13783_adc_driver = { |
9e5e9b7a | 320 | .remove = mc13783_adc_remove, |
93ee0a75 | 321 | .driver = { |
0c273215 | 322 | .name = DRIVER_NAME, |
93ee0a75 | 323 | }, |
0c273215 | 324 | .id_table = mc13783_adc_idtable, |
93ee0a75 LF |
325 | }; |
326 | ||
f40fb63e | 327 | module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe); |
93ee0a75 LF |
328 | |
329 | MODULE_DESCRIPTION("MC13783 ADC driver"); | |
330 | MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>"); | |
331 | MODULE_LICENSE("GPL"); |