1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * CM3323 - Capella Color Light Sensor |
4 | * |
5 | * Copyright (c) 2015, Intel Corporation. |
6 | * |
7 | * IIO driver for CM3323 (7-bit I2C slave address 0x10) |
8 | * |
9 | * TODO: calibscale to correct the lens factor |
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) /* sensor disable */ |
28 | #define CM3323_CONF_AF_BIT BIT(1) /* auto/manual force mode */ |
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 | |
34 | static const struct { |
35 | int val; |
36 | int val2; |
37 | } cm3323_int_time[] = { |
38 | {0, 40000}, /* 40 ms */ |
39 | {0, 80000}, /* 80 ms */ |
40 | {0, 160000}, /* 160 ms */ |
41 | {0, 320000}, /* 320 ms */ |
42 | {0, 640000}, /* 640 ms */ |
43 | {1, 280000}, /* 1280 ms */ |
44 | }; |
45 | |
46 | struct 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 | |
61 | static 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 | |
68 | static IIO_CONST_ATTR_INT_TIME_AVAIL(CM3323_INT_TIME_AVAILABLE); |
69 | |
70 | static struct attribute *cm3323_attributes[] = { |
71 | &iio_const_attr_integration_time_available.dev_attr.attr, |
72 | NULL |
73 | }; |
74 | |
75 | static const struct attribute_group cm3323_attribute_group = { |
76 | .attrs = cm3323_attributes, |
77 | }; |
78 | |
79 | static 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(client: 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 | /* enable sensor and set auto force mode */ |
91 | ret &= ~(CM3323_CONF_SD_BIT | CM3323_CONF_AF_BIT); |
92 | |
93 | ret = i2c_smbus_write_word_data(client: data->client, CM3323_CMD_CONF, value: 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 | |
104 | static void cm3323_disable(void *data) |
105 | { |
106 | int ret; |
107 | struct iio_dev *indio_dev = data; |
108 | struct cm3323_data *cm_data = iio_priv(indio_dev); |
109 | |
110 | ret = i2c_smbus_write_word_data(client: cm_data->client, CM3323_CMD_CONF, |
111 | CM3323_CONF_SD_BIT); |
112 | if (ret < 0) |
113 | dev_err(&cm_data->client->dev, "Error writing reg_conf\n" ); |
114 | } |
115 | |
116 | static int cm3323_set_it_bits(struct cm3323_data *data, int val, int val2) |
117 | { |
118 | int i, ret; |
119 | u16 reg_conf; |
120 | |
121 | for (i = 0; i < ARRAY_SIZE(cm3323_int_time); i++) { |
122 | if (val == cm3323_int_time[i].val && |
123 | val2 == cm3323_int_time[i].val2) { |
124 | reg_conf = data->reg_conf & ~CM3323_CONF_IT_MASK; |
125 | reg_conf |= i << CM3323_CONF_IT_SHIFT; |
126 | |
127 | ret = i2c_smbus_write_word_data(client: data->client, |
128 | CM3323_CMD_CONF, |
129 | value: reg_conf); |
130 | if (ret < 0) |
131 | return ret; |
132 | |
133 | data->reg_conf = reg_conf; |
134 | |
135 | return 0; |
136 | } |
137 | } |
138 | |
139 | return -EINVAL; |
140 | } |
141 | |
142 | static int cm3323_get_it_bits(struct cm3323_data *data) |
143 | { |
144 | int bits; |
145 | |
146 | bits = (data->reg_conf & CM3323_CONF_IT_MASK) >> |
147 | CM3323_CONF_IT_SHIFT; |
148 | |
149 | if (bits >= ARRAY_SIZE(cm3323_int_time)) |
150 | return -EINVAL; |
151 | |
152 | return bits; |
153 | } |
154 | |
155 | static int cm3323_read_raw(struct iio_dev *indio_dev, |
156 | struct iio_chan_spec const *chan, int *val, |
157 | int *val2, long mask) |
158 | { |
159 | int ret; |
160 | struct cm3323_data *data = iio_priv(indio_dev); |
161 | |
162 | switch (mask) { |
163 | case IIO_CHAN_INFO_RAW: |
164 | mutex_lock(&data->mutex); |
165 | ret = i2c_smbus_read_word_data(client: data->client, command: chan->address); |
166 | if (ret < 0) { |
167 | mutex_unlock(lock: &data->mutex); |
168 | return ret; |
169 | } |
170 | *val = ret; |
171 | mutex_unlock(lock: &data->mutex); |
172 | |
173 | return IIO_VAL_INT; |
174 | case IIO_CHAN_INFO_INT_TIME: |
175 | mutex_lock(&data->mutex); |
176 | ret = cm3323_get_it_bits(data); |
177 | if (ret < 0) { |
178 | mutex_unlock(lock: &data->mutex); |
179 | return ret; |
180 | } |
181 | |
182 | *val = cm3323_int_time[ret].val; |
183 | *val2 = cm3323_int_time[ret].val2; |
184 | mutex_unlock(lock: &data->mutex); |
185 | |
186 | return IIO_VAL_INT_PLUS_MICRO; |
187 | default: |
188 | return -EINVAL; |
189 | } |
190 | } |
191 | |
192 | static int cm3323_write_raw(struct iio_dev *indio_dev, |
193 | struct iio_chan_spec const *chan, int val, |
194 | int val2, long mask) |
195 | { |
196 | struct cm3323_data *data = iio_priv(indio_dev); |
197 | int ret; |
198 | |
199 | switch (mask) { |
200 | case IIO_CHAN_INFO_INT_TIME: |
201 | mutex_lock(&data->mutex); |
202 | ret = cm3323_set_it_bits(data, val, val2); |
203 | mutex_unlock(lock: &data->mutex); |
204 | |
205 | return ret; |
206 | default: |
207 | return -EINVAL; |
208 | } |
209 | } |
210 | |
211 | static const struct iio_info cm3323_info = { |
212 | .read_raw = cm3323_read_raw, |
213 | .write_raw = cm3323_write_raw, |
214 | .attrs = &cm3323_attribute_group, |
215 | }; |
216 | |
217 | static int cm3323_probe(struct i2c_client *client) |
218 | { |
219 | struct cm3323_data *data; |
220 | struct iio_dev *indio_dev; |
221 | int ret; |
222 | |
223 | indio_dev = devm_iio_device_alloc(parent: &client->dev, sizeof_priv: sizeof(*data)); |
224 | if (!indio_dev) |
225 | return -ENOMEM; |
226 | |
227 | data = iio_priv(indio_dev); |
228 | i2c_set_clientdata(client, data: indio_dev); |
229 | data->client = client; |
230 | |
231 | mutex_init(&data->mutex); |
232 | |
233 | indio_dev->info = &cm3323_info; |
234 | indio_dev->name = CM3323_DRV_NAME; |
235 | indio_dev->channels = cm3323_channels; |
236 | indio_dev->num_channels = ARRAY_SIZE(cm3323_channels); |
237 | indio_dev->modes = INDIO_DIRECT_MODE; |
238 | |
239 | ret = cm3323_init(indio_dev); |
240 | if (ret < 0) { |
241 | dev_err(&client->dev, "cm3323 chip init failed\n" ); |
242 | return ret; |
243 | } |
244 | |
245 | ret = devm_add_action_or_reset(&client->dev, cm3323_disable, indio_dev); |
246 | if (ret < 0) |
247 | return ret; |
248 | |
249 | return devm_iio_device_register(&client->dev, indio_dev); |
250 | } |
251 | |
252 | static const struct i2c_device_id cm3323_id[] = { |
253 | {"cm3323" , 0}, |
254 | {} |
255 | }; |
256 | MODULE_DEVICE_TABLE(i2c, cm3323_id); |
257 | |
258 | static const struct of_device_id cm3323_of_match[] = { |
259 | { .compatible = "capella,cm3323" , }, |
260 | { /* sentinel */ } |
261 | }; |
262 | MODULE_DEVICE_TABLE(of, cm3323_of_match); |
263 | |
264 | static struct i2c_driver cm3323_driver = { |
265 | .driver = { |
266 | .name = CM3323_DRV_NAME, |
267 | .of_match_table = cm3323_of_match, |
268 | }, |
269 | .probe = cm3323_probe, |
270 | .id_table = cm3323_id, |
271 | }; |
272 | |
273 | module_i2c_driver(cm3323_driver); |
274 | |
275 | MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>" ); |
276 | MODULE_DESCRIPTION("Capella CM3323 Color Light Sensor driver" ); |
277 | MODULE_LICENSE("GPL v2" ); |
278 | |