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62a1efb9 | 1 | /* |
d978bfdd PMS |
2 | * vcnl4000.c - Support for Vishay VCNL4000/4010/4020 combined ambient |
3 | * light and proximity sensor | |
62a1efb9 PM |
4 | * |
5 | * Copyright 2012 Peter Meerwald <pmeerw@pmeerw.net> | |
6 | * | |
7 | * This file is subject to the terms and conditions of version 2 of | |
8 | * the GNU General Public License. See the file COPYING in the main | |
9 | * directory of this archive for more details. | |
10 | * | |
11 | * IIO driver for VCNL4000 (7-bit I2C slave address 0x13) | |
12 | * | |
13 | * TODO: | |
14 | * allow to adjust IR current | |
15 | * proximity threshold and event handling | |
d978bfdd PMS |
16 | * periodic ALS/proximity measurement (VCNL4010/20) |
17 | * interrupts (VCNL4010/20) | |
62a1efb9 PM |
18 | */ |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/i2c.h> | |
22 | #include <linux/err.h> | |
23 | #include <linux/delay.h> | |
24 | ||
25 | #include <linux/iio/iio.h> | |
26 | #include <linux/iio/sysfs.h> | |
27 | ||
28 | #define VCNL4000_DRV_NAME "vcnl4000" | |
d978bfdd PMS |
29 | #define VCNL4000_ID 0x01 |
30 | #define VCNL4010_ID 0x02 /* for VCNL4020, VCNL4010 */ | |
62a1efb9 PM |
31 | |
32 | #define VCNL4000_COMMAND 0x80 /* Command register */ | |
33 | #define VCNL4000_PROD_REV 0x81 /* Product ID and Revision ID */ | |
34 | #define VCNL4000_LED_CURRENT 0x83 /* IR LED current for proximity mode */ | |
35 | #define VCNL4000_AL_PARAM 0x84 /* Ambient light parameter register */ | |
36 | #define VCNL4000_AL_RESULT_HI 0x85 /* Ambient light result register, MSB */ | |
37 | #define VCNL4000_AL_RESULT_LO 0x86 /* Ambient light result register, LSB */ | |
38 | #define VCNL4000_PS_RESULT_HI 0x87 /* Proximity result register, MSB */ | |
39 | #define VCNL4000_PS_RESULT_LO 0x88 /* Proximity result register, LSB */ | |
40 | #define VCNL4000_PS_MEAS_FREQ 0x89 /* Proximity test signal frequency */ | |
41 | #define VCNL4000_PS_MOD_ADJ 0x8a /* Proximity modulator timing adjustment */ | |
42 | ||
43 | /* Bit masks for COMMAND register */ | |
ff6a5259 PMS |
44 | #define VCNL4000_AL_RDY BIT(6) /* ALS data ready? */ |
45 | #define VCNL4000_PS_RDY BIT(5) /* proximity data ready? */ | |
46 | #define VCNL4000_AL_OD BIT(4) /* start on-demand ALS measurement */ | |
47 | #define VCNL4000_PS_OD BIT(3) /* start on-demand proximity measurement */ | |
62a1efb9 PM |
48 | |
49 | struct vcnl4000_data { | |
50 | struct i2c_client *client; | |
ff34ed6d | 51 | struct mutex lock; |
62a1efb9 PM |
52 | }; |
53 | ||
54 | static const struct i2c_device_id vcnl4000_id[] = { | |
55 | { "vcnl4000", 0 }, | |
56 | { } | |
57 | }; | |
58 | MODULE_DEVICE_TABLE(i2c, vcnl4000_id); | |
59 | ||
60 | static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask, | |
61 | u8 rdy_mask, u8 data_reg, int *val) | |
62 | { | |
63 | int tries = 20; | |
91f197e0 | 64 | __be16 buf; |
62a1efb9 PM |
65 | int ret; |
66 | ||
ff34ed6d PMS |
67 | mutex_lock(&data->lock); |
68 | ||
62a1efb9 PM |
69 | ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, |
70 | req_mask); | |
71 | if (ret < 0) | |
ff34ed6d | 72 | goto fail; |
62a1efb9 PM |
73 | |
74 | /* wait for data to become ready */ | |
75 | while (tries--) { | |
76 | ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND); | |
77 | if (ret < 0) | |
ff34ed6d | 78 | goto fail; |
62a1efb9 PM |
79 | if (ret & rdy_mask) |
80 | break; | |
81 | msleep(20); /* measurement takes up to 100 ms */ | |
82 | } | |
83 | ||
84 | if (tries < 0) { | |
85 | dev_err(&data->client->dev, | |
86 | "vcnl4000_measure() failed, data not ready\n"); | |
ff34ed6d PMS |
87 | ret = -EIO; |
88 | goto fail; | |
62a1efb9 PM |
89 | } |
90 | ||
91 | ret = i2c_smbus_read_i2c_block_data(data->client, | |
92 | data_reg, sizeof(buf), (u8 *) &buf); | |
93 | if (ret < 0) | |
ff34ed6d | 94 | goto fail; |
62a1efb9 | 95 | |
ff34ed6d | 96 | mutex_unlock(&data->lock); |
62a1efb9 PM |
97 | *val = be16_to_cpu(buf); |
98 | ||
99 | return 0; | |
ff34ed6d PMS |
100 | |
101 | fail: | |
102 | mutex_unlock(&data->lock); | |
103 | return ret; | |
62a1efb9 PM |
104 | } |
105 | ||
106 | static const struct iio_chan_spec vcnl4000_channels[] = { | |
107 | { | |
108 | .type = IIO_LIGHT, | |
bb7c5940 JC |
109 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
110 | BIT(IIO_CHAN_INFO_SCALE), | |
62a1efb9 PM |
111 | }, { |
112 | .type = IIO_PROXIMITY, | |
bb7c5940 | 113 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
62a1efb9 PM |
114 | } |
115 | }; | |
116 | ||
117 | static int vcnl4000_read_raw(struct iio_dev *indio_dev, | |
118 | struct iio_chan_spec const *chan, | |
119 | int *val, int *val2, long mask) | |
120 | { | |
5d693139 | 121 | int ret; |
62a1efb9 PM |
122 | struct vcnl4000_data *data = iio_priv(indio_dev); |
123 | ||
124 | switch (mask) { | |
125 | case IIO_CHAN_INFO_RAW: | |
126 | switch (chan->type) { | |
127 | case IIO_LIGHT: | |
128 | ret = vcnl4000_measure(data, | |
129 | VCNL4000_AL_OD, VCNL4000_AL_RDY, | |
130 | VCNL4000_AL_RESULT_HI, val); | |
131 | if (ret < 0) | |
132 | return ret; | |
5d693139 | 133 | return IIO_VAL_INT; |
62a1efb9 PM |
134 | case IIO_PROXIMITY: |
135 | ret = vcnl4000_measure(data, | |
136 | VCNL4000_PS_OD, VCNL4000_PS_RDY, | |
137 | VCNL4000_PS_RESULT_HI, val); | |
138 | if (ret < 0) | |
139 | return ret; | |
5d693139 | 140 | return IIO_VAL_INT; |
62a1efb9 | 141 | default: |
5d693139 | 142 | return -EINVAL; |
62a1efb9 | 143 | } |
62a1efb9 | 144 | case IIO_CHAN_INFO_SCALE: |
5d693139 PMS |
145 | if (chan->type != IIO_LIGHT) |
146 | return -EINVAL; | |
147 | ||
148 | *val = 0; | |
149 | *val2 = 250000; | |
150 | return IIO_VAL_INT_PLUS_MICRO; | |
62a1efb9 | 151 | default: |
5d693139 | 152 | return -EINVAL; |
62a1efb9 | 153 | } |
62a1efb9 PM |
154 | } |
155 | ||
156 | static const struct iio_info vcnl4000_info = { | |
157 | .read_raw = vcnl4000_read_raw, | |
62a1efb9 PM |
158 | }; |
159 | ||
fc52692c GKH |
160 | static int vcnl4000_probe(struct i2c_client *client, |
161 | const struct i2c_device_id *id) | |
62a1efb9 PM |
162 | { |
163 | struct vcnl4000_data *data; | |
164 | struct iio_dev *indio_dev; | |
d978bfdd | 165 | int ret, prod_id; |
62a1efb9 | 166 | |
2669d723 | 167 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
62a1efb9 PM |
168 | if (!indio_dev) |
169 | return -ENOMEM; | |
170 | ||
171 | data = iio_priv(indio_dev); | |
172 | i2c_set_clientdata(client, indio_dev); | |
173 | data->client = client; | |
ff34ed6d | 174 | mutex_init(&data->lock); |
62a1efb9 PM |
175 | |
176 | ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV); | |
177 | if (ret < 0) | |
2669d723 | 178 | return ret; |
62a1efb9 | 179 | |
d978bfdd PMS |
180 | prod_id = ret >> 4; |
181 | if (prod_id != VCNL4010_ID && prod_id != VCNL4000_ID) | |
182 | return -ENODEV; | |
183 | ||
184 | dev_dbg(&client->dev, "%s Ambient light/proximity sensor, Rev: %02x\n", | |
185 | (prod_id == VCNL4010_ID) ? "VCNL4010/4020" : "VCNL4000", | |
186 | ret & 0xf); | |
62a1efb9 PM |
187 | |
188 | indio_dev->dev.parent = &client->dev; | |
189 | indio_dev->info = &vcnl4000_info; | |
190 | indio_dev->channels = vcnl4000_channels; | |
191 | indio_dev->num_channels = ARRAY_SIZE(vcnl4000_channels); | |
192 | indio_dev->name = VCNL4000_DRV_NAME; | |
193 | indio_dev->modes = INDIO_DIRECT_MODE; | |
194 | ||
691dab42 | 195 | return devm_iio_device_register(&client->dev, indio_dev); |
62a1efb9 PM |
196 | } |
197 | ||
198 | static struct i2c_driver vcnl4000_driver = { | |
199 | .driver = { | |
200 | .name = VCNL4000_DRV_NAME, | |
62a1efb9 PM |
201 | }, |
202 | .probe = vcnl4000_probe, | |
62a1efb9 PM |
203 | .id_table = vcnl4000_id, |
204 | }; | |
205 | ||
206 | module_i2c_driver(vcnl4000_driver); | |
207 | ||
208 | MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); | |
209 | MODULE_DESCRIPTION("Vishay VCNL4000 proximity/ambient light sensor driver"); | |
210 | MODULE_LICENSE("GPL"); |