This source file includes following definitions.
- cm3605_prox_irq
- cm3605_get_lux
- cm3605_read_raw
- cm3605_probe
- cm3605_remove
- cm3605_pm_suspend
- cm3605_pm_resume
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12 #include <linux/module.h>
13 #include <linux/iio/iio.h>
14 #include <linux/iio/sysfs.h>
15 #include <linux/iio/events.h>
16 #include <linux/iio/consumer.h>
17 #include <linux/iio/types.h>
18 #include <linux/init.h>
19 #include <linux/leds.h>
20 #include <linux/platform_device.h>
21 #include <linux/of.h>
22 #include <linux/regulator/consumer.h>
23 #include <linux/gpio/consumer.h>
24 #include <linux/interrupt.h>
25 #include <linux/math64.h>
26 #include <linux/pm.h>
27
28 #define CM3605_PROX_CHANNEL 0
29 #define CM3605_ALS_CHANNEL 1
30 #define CM3605_AOUT_TYP_MAX_MV 1550
31
32 #define CM3605_AOUT_MAX_MV 1650
33
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41
42
43
44 struct cm3605 {
45 struct device *dev;
46 struct regulator *vdd;
47 struct gpio_desc *aset;
48 struct iio_channel *aout;
49 s32 als_max;
50 enum iio_event_direction dir;
51 struct led_trigger *led;
52 };
53
54 static irqreturn_t cm3605_prox_irq(int irq, void *d)
55 {
56 struct iio_dev *indio_dev = d;
57 struct cm3605 *cm3605 = iio_priv(indio_dev);
58 u64 ev;
59
60 ev = IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, CM3605_PROX_CHANNEL,
61 IIO_EV_TYPE_THRESH, cm3605->dir);
62 iio_push_event(indio_dev, ev, iio_get_time_ns(indio_dev));
63
64
65 if (cm3605->dir == IIO_EV_DIR_RISING)
66 cm3605->dir = IIO_EV_DIR_FALLING;
67 else
68 cm3605->dir = IIO_EV_DIR_RISING;
69
70 return IRQ_HANDLED;
71 }
72
73 static int cm3605_get_lux(struct cm3605 *cm3605)
74 {
75 int ret, res;
76 s64 lux;
77
78 ret = iio_read_channel_processed(cm3605->aout, &res);
79 if (ret < 0)
80 return ret;
81
82 dev_dbg(cm3605->dev, "read %d mV from ADC\n", res);
83
84
85
86
87
88
89
90 if (res < 30)
91 return 0;
92 if (res > CM3605_AOUT_MAX_MV)
93 dev_err(cm3605->dev, "device out of range\n");
94
95
96 lux = res - 30;
97
98
99 lux *= cm3605->als_max;
100 lux = div64_s64(lux, CM3605_AOUT_TYP_MAX_MV);
101
102 return lux;
103 }
104
105 static int cm3605_read_raw(struct iio_dev *indio_dev,
106 struct iio_chan_spec const *chan,
107 int *val, int *val2, long mask)
108 {
109 struct cm3605 *cm3605 = iio_priv(indio_dev);
110 int ret;
111
112 switch (mask) {
113 case IIO_CHAN_INFO_RAW:
114 switch (chan->type) {
115 case IIO_LIGHT:
116 ret = cm3605_get_lux(cm3605);
117 if (ret < 0)
118 return ret;
119 *val = ret;
120 return IIO_VAL_INT;
121 default:
122 return -EINVAL;
123 }
124 default:
125 return -EINVAL;
126 }
127 }
128
129 static const struct iio_info cm3605_info = {
130 .read_raw = cm3605_read_raw,
131 };
132
133 static const struct iio_event_spec cm3605_events[] = {
134 {
135 .type = IIO_EV_TYPE_THRESH,
136 .dir = IIO_EV_DIR_EITHER,
137 .mask_separate = BIT(IIO_EV_INFO_ENABLE),
138 },
139 };
140
141 static const struct iio_chan_spec cm3605_channels[] = {
142 {
143 .type = IIO_PROXIMITY,
144 .event_spec = cm3605_events,
145 .num_event_specs = ARRAY_SIZE(cm3605_events),
146 },
147 {
148 .type = IIO_LIGHT,
149 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
150 .channel = CM3605_ALS_CHANNEL,
151 },
152 };
153
154 static int cm3605_probe(struct platform_device *pdev)
155 {
156 struct cm3605 *cm3605;
157 struct iio_dev *indio_dev;
158 struct device *dev = &pdev->dev;
159 struct device_node *np = dev->of_node;
160 enum iio_chan_type ch_type;
161 u32 rset;
162 int ret;
163
164 indio_dev = devm_iio_device_alloc(dev, sizeof(*cm3605));
165 if (!indio_dev)
166 return -ENOMEM;
167 platform_set_drvdata(pdev, indio_dev);
168
169 cm3605 = iio_priv(indio_dev);
170 cm3605->dev = dev;
171 cm3605->dir = IIO_EV_DIR_FALLING;
172
173 ret = of_property_read_u32(np, "capella,aset-resistance-ohms", &rset);
174 if (ret) {
175 dev_info(dev, "no RSET specified, assuming 100K\n");
176 rset = 100000;
177 }
178 switch (rset) {
179 case 50000:
180 cm3605->als_max = 650;
181 break;
182 case 100000:
183 cm3605->als_max = 300;
184 break;
185 case 300000:
186 cm3605->als_max = 100;
187 break;
188 case 600000:
189 cm3605->als_max = 50;
190 break;
191 default:
192 dev_info(dev, "non-standard resistance\n");
193 return -EINVAL;
194 }
195
196 cm3605->aout = devm_iio_channel_get(dev, "aout");
197 if (IS_ERR(cm3605->aout)) {
198 if (PTR_ERR(cm3605->aout) == -ENODEV) {
199 dev_err(dev, "no ADC, deferring...\n");
200 return -EPROBE_DEFER;
201 }
202 dev_err(dev, "failed to get AOUT ADC channel\n");
203 return PTR_ERR(cm3605->aout);
204 }
205 ret = iio_get_channel_type(cm3605->aout, &ch_type);
206 if (ret < 0)
207 return ret;
208 if (ch_type != IIO_VOLTAGE) {
209 dev_err(dev, "wrong type of IIO channel specified for AOUT\n");
210 return -EINVAL;
211 }
212
213 cm3605->vdd = devm_regulator_get(dev, "vdd");
214 if (IS_ERR(cm3605->vdd)) {
215 dev_err(dev, "failed to get VDD regulator\n");
216 return PTR_ERR(cm3605->vdd);
217 }
218 ret = regulator_enable(cm3605->vdd);
219 if (ret) {
220 dev_err(dev, "failed to enable VDD regulator\n");
221 return ret;
222 }
223
224 cm3605->aset = devm_gpiod_get(dev, "aset", GPIOD_OUT_HIGH);
225 if (IS_ERR(cm3605->aset)) {
226 dev_err(dev, "no ASET GPIO\n");
227 ret = PTR_ERR(cm3605->aset);
228 goto out_disable_vdd;
229 }
230
231 ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0),
232 cm3605_prox_irq, NULL, 0, "cm3605", indio_dev);
233 if (ret) {
234 dev_err(dev, "unable to request IRQ\n");
235 goto out_disable_aset;
236 }
237
238
239 led_trigger_register_simple("cm3605", &cm3605->led);
240 led_trigger_event(cm3605->led, LED_FULL);
241
242 indio_dev->dev.parent = dev;
243 indio_dev->info = &cm3605_info;
244 indio_dev->name = "cm3605";
245 indio_dev->channels = cm3605_channels;
246 indio_dev->num_channels = ARRAY_SIZE(cm3605_channels);
247 indio_dev->modes = INDIO_DIRECT_MODE;
248
249 ret = iio_device_register(indio_dev);
250 if (ret)
251 goto out_remove_trigger;
252 dev_info(dev, "Capella Microsystems CM3605 enabled range 0..%d LUX\n",
253 cm3605->als_max);
254
255 return 0;
256
257 out_remove_trigger:
258 led_trigger_event(cm3605->led, LED_OFF);
259 led_trigger_unregister_simple(cm3605->led);
260 out_disable_aset:
261 gpiod_set_value_cansleep(cm3605->aset, 0);
262 out_disable_vdd:
263 regulator_disable(cm3605->vdd);
264 return ret;
265 }
266
267 static int cm3605_remove(struct platform_device *pdev)
268 {
269 struct iio_dev *indio_dev = platform_get_drvdata(pdev);
270 struct cm3605 *cm3605 = iio_priv(indio_dev);
271
272 led_trigger_event(cm3605->led, LED_OFF);
273 led_trigger_unregister_simple(cm3605->led);
274 gpiod_set_value_cansleep(cm3605->aset, 0);
275 iio_device_unregister(indio_dev);
276 regulator_disable(cm3605->vdd);
277
278 return 0;
279 }
280
281 static int __maybe_unused cm3605_pm_suspend(struct device *dev)
282 {
283 struct iio_dev *indio_dev = dev_get_drvdata(dev);
284 struct cm3605 *cm3605 = iio_priv(indio_dev);
285
286 led_trigger_event(cm3605->led, LED_OFF);
287 regulator_disable(cm3605->vdd);
288
289 return 0;
290 }
291
292 static int __maybe_unused cm3605_pm_resume(struct device *dev)
293 {
294 struct iio_dev *indio_dev = dev_get_drvdata(dev);
295 struct cm3605 *cm3605 = iio_priv(indio_dev);
296 int ret;
297
298 ret = regulator_enable(cm3605->vdd);
299 if (ret)
300 dev_err(dev, "failed to enable regulator in resume path\n");
301 led_trigger_event(cm3605->led, LED_FULL);
302
303 return 0;
304 }
305
306 static const struct dev_pm_ops cm3605_dev_pm_ops = {
307 SET_SYSTEM_SLEEP_PM_OPS(cm3605_pm_suspend,
308 cm3605_pm_resume)
309 };
310
311 static const struct of_device_id cm3605_of_match[] = {
312 {.compatible = "capella,cm3605"},
313 { },
314 };
315 MODULE_DEVICE_TABLE(of, cm3605_of_match);
316
317 static struct platform_driver cm3605_driver = {
318 .driver = {
319 .name = "cm3605",
320 .of_match_table = cm3605_of_match,
321 .pm = &cm3605_dev_pm_ops,
322 },
323 .probe = cm3605_probe,
324 .remove = cm3605_remove,
325 };
326 module_platform_driver(cm3605_driver);
327
328 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
329 MODULE_DESCRIPTION("CM3605 ambient light and proximity sensor driver");
330 MODULE_LICENSE("GPL");