1
2
3
4
5
6
7
8
9
10
11#include <linux/module.h>
12#include <linux/init.h>
13#include <linux/i2c.h>
14#include <linux/mutex.h>
15
16#include <linux/iio/iio.h>
17#include <linux/iio/sysfs.h>
18
19#define CM3323_DRV_NAME "cm3323"
20
21#define CM3323_CMD_CONF 0x00
22#define CM3323_CMD_RED_DATA 0x08
23#define CM3323_CMD_GREEN_DATA 0x09
24#define CM3323_CMD_BLUE_DATA 0x0A
25#define CM3323_CMD_CLEAR_DATA 0x0B
26
27#define CM3323_CONF_SD_BIT BIT(0)
28#define CM3323_CONF_AF_BIT BIT(1)
29#define CM3323_CONF_IT_MASK GENMASK(6, 4)
30#define CM3323_CONF_IT_SHIFT 4
31
32#define CM3323_INT_TIME_AVAILABLE "0.04 0.08 0.16 0.32 0.64 1.28"
33
34static const struct {
35 int val;
36 int val2;
37} cm3323_int_time[] = {
38 {0, 40000},
39 {0, 80000},
40 {0, 160000},
41 {0, 320000},
42 {0, 640000},
43 {1, 280000},
44};
45
46struct cm3323_data {
47 struct i2c_client *client;
48 u16 reg_conf;
49 struct mutex mutex;
50};
51
52#define CM3323_COLOR_CHANNEL(_color, _addr) { \
53 .type = IIO_INTENSITY, \
54 .modified = 1, \
55 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
56 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), \
57 .channel2 = IIO_MOD_LIGHT_##_color, \
58 .address = _addr, \
59}
60
61static const struct iio_chan_spec cm3323_channels[] = {
62 CM3323_COLOR_CHANNEL(RED, CM3323_CMD_RED_DATA),
63 CM3323_COLOR_CHANNEL(GREEN, CM3323_CMD_GREEN_DATA),
64 CM3323_COLOR_CHANNEL(BLUE, CM3323_CMD_BLUE_DATA),
65 CM3323_COLOR_CHANNEL(CLEAR, CM3323_CMD_CLEAR_DATA),
66};
67
68static IIO_CONST_ATTR_INT_TIME_AVAIL(CM3323_INT_TIME_AVAILABLE);
69
70static struct attribute *cm3323_attributes[] = {
71 &iio_const_attr_integration_time_available.dev_attr.attr,
72 NULL
73};
74
75static const struct attribute_group cm3323_attribute_group = {
76 .attrs = cm3323_attributes,
77};
78
79static int cm3323_init(struct iio_dev *indio_dev)
80{
81 int ret;
82 struct cm3323_data *data = iio_priv(indio_dev);
83
84 ret = i2c_smbus_read_word_data(data->client, CM3323_CMD_CONF);
85 if (ret < 0) {
86 dev_err(&data->client->dev, "Error reading reg_conf\n");
87 return ret;
88 }
89
90
91 ret &= ~(CM3323_CONF_SD_BIT | CM3323_CONF_AF_BIT);
92
93 ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF, ret);
94 if (ret < 0) {
95 dev_err(&data->client->dev, "Error writing reg_conf\n");
96 return ret;
97 }
98
99 data->reg_conf = ret;
100
101 return 0;
102}
103
104static void cm3323_disable(struct iio_dev *indio_dev)
105{
106 int ret;
107 struct cm3323_data *data = iio_priv(indio_dev);
108
109 ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF,
110 CM3323_CONF_SD_BIT);
111 if (ret < 0)
112 dev_err(&data->client->dev, "Error writing reg_conf\n");
113}
114
115static int cm3323_set_it_bits(struct cm3323_data *data, int val, int val2)
116{
117 int i, ret;
118 u16 reg_conf;
119
120 for (i = 0; i < ARRAY_SIZE(cm3323_int_time); i++) {
121 if (val == cm3323_int_time[i].val &&
122 val2 == cm3323_int_time[i].val2) {
123 reg_conf = data->reg_conf & ~CM3323_CONF_IT_MASK;
124 reg_conf |= i << CM3323_CONF_IT_SHIFT;
125
126 ret = i2c_smbus_write_word_data(data->client,
127 CM3323_CMD_CONF,
128 reg_conf);
129 if (ret < 0)
130 return ret;
131
132 data->reg_conf = reg_conf;
133
134 return 0;
135 }
136 }
137
138 return -EINVAL;
139}
140
141static int cm3323_get_it_bits(struct cm3323_data *data)
142{
143 int bits;
144
145 bits = (data->reg_conf & CM3323_CONF_IT_MASK) >>
146 CM3323_CONF_IT_SHIFT;
147
148 if (bits >= ARRAY_SIZE(cm3323_int_time))
149 return -EINVAL;
150
151 return bits;
152}
153
154static int cm3323_read_raw(struct iio_dev *indio_dev,
155 struct iio_chan_spec const *chan, int *val,
156 int *val2, long mask)
157{
158 int ret;
159 struct cm3323_data *data = iio_priv(indio_dev);
160
161 switch (mask) {
162 case IIO_CHAN_INFO_RAW:
163 mutex_lock(&data->mutex);
164 ret = i2c_smbus_read_word_data(data->client, chan->address);
165 if (ret < 0) {
166 mutex_unlock(&data->mutex);
167 return ret;
168 }
169 *val = ret;
170 mutex_unlock(&data->mutex);
171
172 return IIO_VAL_INT;
173 case IIO_CHAN_INFO_INT_TIME:
174 mutex_lock(&data->mutex);
175 ret = cm3323_get_it_bits(data);
176 if (ret < 0) {
177 mutex_unlock(&data->mutex);
178 return ret;
179 }
180
181 *val = cm3323_int_time[ret].val;
182 *val2 = cm3323_int_time[ret].val2;
183 mutex_unlock(&data->mutex);
184
185 return IIO_VAL_INT_PLUS_MICRO;
186 default:
187 return -EINVAL;
188 }
189}
190
191static int cm3323_write_raw(struct iio_dev *indio_dev,
192 struct iio_chan_spec const *chan, int val,
193 int val2, long mask)
194{
195 struct cm3323_data *data = iio_priv(indio_dev);
196 int ret;
197
198 switch (mask) {
199 case IIO_CHAN_INFO_INT_TIME:
200 mutex_lock(&data->mutex);
201 ret = cm3323_set_it_bits(data, val, val2);
202 mutex_unlock(&data->mutex);
203
204 return ret;
205 default:
206 return -EINVAL;
207 }
208}
209
210static const struct iio_info cm3323_info = {
211 .read_raw = cm3323_read_raw,
212 .write_raw = cm3323_write_raw,
213 .attrs = &cm3323_attribute_group,
214};
215
216static int cm3323_probe(struct i2c_client *client,
217 const struct i2c_device_id *id)
218{
219 struct cm3323_data *data;
220 struct iio_dev *indio_dev;
221 int ret;
222
223 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
224 if (!indio_dev)
225 return -ENOMEM;
226
227 data = iio_priv(indio_dev);
228 i2c_set_clientdata(client, indio_dev);
229 data->client = client;
230
231 mutex_init(&data->mutex);
232
233 indio_dev->dev.parent = &client->dev;
234 indio_dev->info = &cm3323_info;
235 indio_dev->name = CM3323_DRV_NAME;
236 indio_dev->channels = cm3323_channels;
237 indio_dev->num_channels = ARRAY_SIZE(cm3323_channels);
238 indio_dev->modes = INDIO_DIRECT_MODE;
239
240 ret = cm3323_init(indio_dev);
241 if (ret < 0) {
242 dev_err(&client->dev, "cm3323 chip init failed\n");
243 return ret;
244 }
245
246 ret = iio_device_register(indio_dev);
247 if (ret < 0) {
248 dev_err(&client->dev, "failed to register iio dev\n");
249 goto err_init;
250 }
251
252 return 0;
253err_init:
254 cm3323_disable(indio_dev);
255 return ret;
256}
257
258static int cm3323_remove(struct i2c_client *client)
259{
260 struct iio_dev *indio_dev = i2c_get_clientdata(client);
261
262 iio_device_unregister(indio_dev);
263 cm3323_disable(indio_dev);
264
265 return 0;
266}
267
268static const struct i2c_device_id cm3323_id[] = {
269 {"cm3323", 0},
270 {}
271};
272MODULE_DEVICE_TABLE(i2c, cm3323_id);
273
274static struct i2c_driver cm3323_driver = {
275 .driver = {
276 .name = CM3323_DRV_NAME,
277 },
278 .probe = cm3323_probe,
279 .remove = cm3323_remove,
280 .id_table = cm3323_id,
281};
282
283module_i2c_driver(cm3323_driver);
284
285MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
286MODULE_DESCRIPTION("Capella CM3323 Color Light Sensor driver");
287MODULE_LICENSE("GPL v2");
288