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 | |
26 | struct mc13783_adc_priv { |
27 | struct mc13xxx *mc13xxx; |
28 | struct device *hwmon_dev; |
29 | char name[PLATFORM_NAME_SIZE]; |
30 | }; |
31 | |
32 | static 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, fmt: "%s\n" , priv->name); |
38 | } |
39 | |
40 | static 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(mc13xxx: priv->mc13xxx, |
50 | MC13XXX_ADC_MODE_MULT_CHAN, |
51 | channel, ato: 0, atox: 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 | |
66 | static 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: &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, fmt: "%u\n" , val); |
88 | } |
89 | |
90 | static 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: &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, fmt: "%u\n" , val); |
107 | } |
108 | |
109 | static 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: &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, fmt: "%u\n" , val); |
129 | } |
130 | |
131 | static 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: &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, fmt: "%d\n" , ret); |
160 | } |
161 | |
162 | static DEVICE_ATTR_RO(name); |
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); |
177 | |
178 | static 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 | |
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[] = { |
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 | |
202 | static const struct attribute_group mc13783_group_16chans = { |
203 | .attrs = mc13783_attr_16chans, |
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 | |
219 | static 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(mc13xxx: priv->mc13xxx); |
223 | |
224 | return flags & MC13XXX_USE_TOUCHSCREEN; |
225 | } |
226 | |
227 | static 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(dev: &pdev->dev, size: sizeof(*priv), GFP_KERNEL); |
235 | if (!priv) |
236 | return -ENOMEM; |
237 | |
238 | priv->mc13xxx = dev_get_drvdata(dev: pdev->dev.parent); |
239 | snprintf(buf: priv->name, ARRAY_SIZE(priv->name), fmt: "%s" , id->name); |
240 | dash = strchr(priv->name, '-'); |
241 | if (dash) |
242 | *dash = '\0'; |
243 | |
244 | platform_set_drvdata(pdev, data: priv); |
245 | |
246 | /* Register sysfs hooks */ |
247 | ret = sysfs_create_group(kobj: &pdev->dev.kobj, grp: &mc13783_group_base); |
248 | if (ret) |
249 | return ret; |
250 | |
251 | if (id->driver_data & MC13783_ADC_16CHANS) { |
252 | ret = sysfs_create_group(kobj: &pdev->dev.kobj, |
253 | grp: &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(kobj: &pdev->dev.kobj, grp: &mc13783_group_ts); |
260 | if (ret) |
261 | goto out_err_create_ts; |
262 | } |
263 | |
264 | priv->hwmon_dev = hwmon_device_register(dev: &pdev->dev); |
265 | if (IS_ERR(ptr: priv->hwmon_dev)) { |
266 | ret = PTR_ERR(ptr: 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 | |
274 | out_err_register: |
275 | |
276 | if (!mc13783_adc_use_touchscreen(pdev)) |
277 | sysfs_remove_group(kobj: &pdev->dev.kobj, grp: &mc13783_group_ts); |
278 | out_err_create_ts: |
279 | |
280 | if (id->driver_data & MC13783_ADC_16CHANS) |
281 | sysfs_remove_group(kobj: &pdev->dev.kobj, grp: &mc13783_group_16chans); |
282 | out_err_create_16chans: |
283 | |
284 | sysfs_remove_group(kobj: &pdev->dev.kobj, grp: &mc13783_group_base); |
285 | return ret; |
286 | } |
287 | |
288 | static void 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(dev: priv->hwmon_dev); |
294 | |
295 | if (!mc13783_adc_use_touchscreen(pdev)) |
296 | sysfs_remove_group(kobj: &pdev->dev.kobj, grp: &mc13783_group_ts); |
297 | |
298 | if (driver_data & MC13783_ADC_16CHANS) |
299 | sysfs_remove_group(kobj: &pdev->dev.kobj, grp: &mc13783_group_16chans); |
300 | |
301 | sysfs_remove_group(kobj: &pdev->dev.kobj, grp: &mc13783_group_base); |
302 | } |
303 | |
304 | static const struct platform_device_id mc13783_adc_idtable[] = { |
305 | { |
306 | .name = "mc13783-adc" , |
307 | .driver_data = MC13783_ADC_16CHANS, |
308 | }, { |
309 | .name = "mc13892-adc" , |
310 | .driver_data = MC13783_ADC_BPDIV2, |
311 | }, { |
312 | /* sentinel */ |
313 | } |
314 | }; |
315 | MODULE_DEVICE_TABLE(platform, mc13783_adc_idtable); |
316 | |
317 | static struct platform_driver mc13783_adc_driver = { |
318 | .remove_new = mc13783_adc_remove, |
319 | .driver = { |
320 | .name = DRIVER_NAME, |
321 | }, |
322 | .id_table = mc13783_adc_idtable, |
323 | }; |
324 | |
325 | module_platform_driver_probe(mc13783_adc_driver, mc13783_adc_probe); |
326 | |
327 | MODULE_DESCRIPTION("MC13783 ADC driver" ); |
328 | MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>" ); |
329 | MODULE_LICENSE("GPL" ); |
330 | |