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