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14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/i2c.h>
17#include <linux/mutex.h>
18
19#include <linux/iio/iio.h>
20#include <linux/iio/sysfs.h>
21
22#define CM3323_DRV_NAME "cm3323"
23
24#define CM3323_CMD_CONF 0x00
25#define CM3323_CMD_RED_DATA 0x08
26#define CM3323_CMD_GREEN_DATA 0x09
27#define CM3323_CMD_BLUE_DATA 0x0A
28#define CM3323_CMD_CLEAR_DATA 0x0B
29
30#define CM3323_CONF_SD_BIT BIT(0)
31#define CM3323_CONF_AF_BIT BIT(1)
32#define CM3323_CONF_IT_MASK GENMASK(6, 4)
33#define CM3323_CONF_IT_SHIFT 4
34
35#define CM3323_INT_TIME_AVAILABLE "0.04 0.08 0.16 0.32 0.64 1.28"
36
37static const struct {
38 int val;
39 int val2;
40} cm3323_int_time[] = {
41 {0, 40000},
42 {0, 80000},
43 {0, 160000},
44 {0, 320000},
45 {0, 640000},
46 {1, 280000},
47};
48
49struct cm3323_data {
50 struct i2c_client *client;
51 u16 reg_conf;
52 struct mutex mutex;
53};
54
55#define CM3323_COLOR_CHANNEL(_color, _addr) { \
56 .type = IIO_INTENSITY, \
57 .modified = 1, \
58 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
59 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), \
60 .channel2 = IIO_MOD_LIGHT_##_color, \
61 .address = _addr, \
62}
63
64static const struct iio_chan_spec cm3323_channels[] = {
65 CM3323_COLOR_CHANNEL(RED, CM3323_CMD_RED_DATA),
66 CM3323_COLOR_CHANNEL(GREEN, CM3323_CMD_GREEN_DATA),
67 CM3323_COLOR_CHANNEL(BLUE, CM3323_CMD_BLUE_DATA),
68 CM3323_COLOR_CHANNEL(CLEAR, CM3323_CMD_CLEAR_DATA),
69};
70
71static IIO_CONST_ATTR_INT_TIME_AVAIL(CM3323_INT_TIME_AVAILABLE);
72
73static struct attribute *cm3323_attributes[] = {
74 &iio_const_attr_integration_time_available.dev_attr.attr,
75 NULL
76};
77
78static const struct attribute_group cm3323_attribute_group = {
79 .attrs = cm3323_attributes,
80};
81
82static int cm3323_init(struct iio_dev *indio_dev)
83{
84 int ret;
85 struct cm3323_data *data = iio_priv(indio_dev);
86
87 ret = i2c_smbus_read_word_data(data->client, CM3323_CMD_CONF);
88 if (ret < 0) {
89 dev_err(&data->client->dev, "Error reading reg_conf\n");
90 return ret;
91 }
92
93
94 ret &= ~(CM3323_CONF_SD_BIT | CM3323_CONF_AF_BIT);
95
96 ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF, ret);
97 if (ret < 0) {
98 dev_err(&data->client->dev, "Error writing reg_conf\n");
99 return ret;
100 }
101
102 data->reg_conf = ret;
103
104 return 0;
105}
106
107static void cm3323_disable(struct iio_dev *indio_dev)
108{
109 int ret;
110 struct cm3323_data *data = iio_priv(indio_dev);
111
112 ret = i2c_smbus_write_word_data(data->client, CM3323_CMD_CONF,
113 CM3323_CONF_SD_BIT);
114 if (ret < 0)
115 dev_err(&data->client->dev, "Error writing reg_conf\n");
116}
117
118static int cm3323_set_it_bits(struct cm3323_data *data, int val, int val2)
119{
120 int i, ret;
121 u16 reg_conf;
122
123 for (i = 0; i < ARRAY_SIZE(cm3323_int_time); i++) {
124 if (val == cm3323_int_time[i].val &&
125 val2 == cm3323_int_time[i].val2) {
126 reg_conf = data->reg_conf & ~CM3323_CONF_IT_MASK;
127 reg_conf |= i << CM3323_CONF_IT_SHIFT;
128
129 ret = i2c_smbus_write_word_data(data->client,
130 CM3323_CMD_CONF,
131 reg_conf);
132 if (ret < 0)
133 return ret;
134
135 data->reg_conf = reg_conf;
136
137 return 0;
138 }
139 }
140
141 return -EINVAL;
142}
143
144static int cm3323_get_it_bits(struct cm3323_data *data)
145{
146 int bits;
147
148 bits = (data->reg_conf & CM3323_CONF_IT_MASK) >>
149 CM3323_CONF_IT_SHIFT;
150
151 if (bits >= ARRAY_SIZE(cm3323_int_time))
152 return -EINVAL;
153
154 return bits;
155}
156
157static int cm3323_read_raw(struct iio_dev *indio_dev,
158 struct iio_chan_spec const *chan, int *val,
159 int *val2, long mask)
160{
161 int ret;
162 struct cm3323_data *data = iio_priv(indio_dev);
163
164 switch (mask) {
165 case IIO_CHAN_INFO_RAW:
166 mutex_lock(&data->mutex);
167 ret = i2c_smbus_read_word_data(data->client, chan->address);
168 if (ret < 0) {
169 mutex_unlock(&data->mutex);
170 return ret;
171 }
172 *val = ret;
173 mutex_unlock(&data->mutex);
174
175 return IIO_VAL_INT;
176 case IIO_CHAN_INFO_INT_TIME:
177 mutex_lock(&data->mutex);
178 ret = cm3323_get_it_bits(data);
179 if (ret < 0) {
180 mutex_unlock(&data->mutex);
181 return ret;
182 }
183
184 *val = cm3323_int_time[ret].val;
185 *val2 = cm3323_int_time[ret].val2;
186 mutex_unlock(&data->mutex);
187
188 return IIO_VAL_INT_PLUS_MICRO;
189 default:
190 return -EINVAL;
191 }
192}
193
194static int cm3323_write_raw(struct iio_dev *indio_dev,
195 struct iio_chan_spec const *chan, int val,
196 int val2, long mask)
197{
198 struct cm3323_data *data = iio_priv(indio_dev);
199 int ret;
200
201 switch (mask) {
202 case IIO_CHAN_INFO_INT_TIME:
203 mutex_lock(&data->mutex);
204 ret = cm3323_set_it_bits(data, val, val2);
205 mutex_unlock(&data->mutex);
206
207 return ret;
208 default:
209 return -EINVAL;
210 }
211}
212
213static const struct iio_info cm3323_info = {
214 .driver_module = THIS_MODULE,
215 .read_raw = cm3323_read_raw,
216 .write_raw = cm3323_write_raw,
217 .attrs = &cm3323_attribute_group,
218};
219
220static int cm3323_probe(struct i2c_client *client,
221 const struct i2c_device_id *id)
222{
223 struct cm3323_data *data;
224 struct iio_dev *indio_dev;
225 int ret;
226
227 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
228 if (!indio_dev)
229 return -ENOMEM;
230
231 data = iio_priv(indio_dev);
232 i2c_set_clientdata(client, indio_dev);
233 data->client = client;
234
235 mutex_init(&data->mutex);
236
237 indio_dev->dev.parent = &client->dev;
238 indio_dev->info = &cm3323_info;
239 indio_dev->name = CM3323_DRV_NAME;
240 indio_dev->channels = cm3323_channels;
241 indio_dev->num_channels = ARRAY_SIZE(cm3323_channels);
242 indio_dev->modes = INDIO_DIRECT_MODE;
243
244 ret = cm3323_init(indio_dev);
245 if (ret < 0) {
246 dev_err(&client->dev, "cm3323 chip init failed\n");
247 return ret;
248 }
249
250 ret = iio_device_register(indio_dev);
251 if (ret < 0) {
252 dev_err(&client->dev, "failed to register iio dev\n");
253 goto err_init;
254 }
255
256 return 0;
257err_init:
258 cm3323_disable(indio_dev);
259 return ret;
260}
261
262static int cm3323_remove(struct i2c_client *client)
263{
264 struct iio_dev *indio_dev = i2c_get_clientdata(client);
265
266 iio_device_unregister(indio_dev);
267 cm3323_disable(indio_dev);
268
269 return 0;
270}
271
272static const struct i2c_device_id cm3323_id[] = {
273 {"cm3323", 0},
274 {}
275};
276MODULE_DEVICE_TABLE(i2c, cm3323_id);
277
278static struct i2c_driver cm3323_driver = {
279 .driver = {
280 .name = CM3323_DRV_NAME,
281 },
282 .probe = cm3323_probe,
283 .remove = cm3323_remove,
284 .id_table = cm3323_id,
285};
286
287module_i2c_driver(cm3323_driver);
288
289MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
290MODULE_DESCRIPTION("Capella CM3323 Color Light Sensor driver");
291MODULE_LICENSE("GPL v2");
292
