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62a1efb9 PM |
1 | /* |
2 | * vcnl4000.c - Support for Vishay VCNL4000 combined ambient light and | |
3 | * proximity sensor | |
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 | |
16 | */ | |
17 | ||
18 | #include <linux/module.h> | |
19 | #include <linux/i2c.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/delay.h> | |
22 | ||
23 | #include <linux/iio/iio.h> | |
24 | #include <linux/iio/sysfs.h> | |
25 | ||
26 | #define VCNL4000_DRV_NAME "vcnl4000" | |
27 | ||
28 | #define VCNL4000_COMMAND 0x80 /* Command register */ | |
29 | #define VCNL4000_PROD_REV 0x81 /* Product ID and Revision ID */ | |
30 | #define VCNL4000_LED_CURRENT 0x83 /* IR LED current for proximity mode */ | |
31 | #define VCNL4000_AL_PARAM 0x84 /* Ambient light parameter register */ | |
32 | #define VCNL4000_AL_RESULT_HI 0x85 /* Ambient light result register, MSB */ | |
33 | #define VCNL4000_AL_RESULT_LO 0x86 /* Ambient light result register, LSB */ | |
34 | #define VCNL4000_PS_RESULT_HI 0x87 /* Proximity result register, MSB */ | |
35 | #define VCNL4000_PS_RESULT_LO 0x88 /* Proximity result register, LSB */ | |
36 | #define VCNL4000_PS_MEAS_FREQ 0x89 /* Proximity test signal frequency */ | |
37 | #define VCNL4000_PS_MOD_ADJ 0x8a /* Proximity modulator timing adjustment */ | |
38 | ||
39 | /* Bit masks for COMMAND register */ | |
40 | #define VCNL4000_AL_RDY 0x40 /* ALS data ready? */ | |
41 | #define VCNL4000_PS_RDY 0x20 /* proximity data ready? */ | |
42 | #define VCNL4000_AL_OD 0x10 /* start on-demand ALS measurement */ | |
43 | #define VCNL4000_PS_OD 0x08 /* start on-demand proximity measurement */ | |
44 | ||
45 | struct vcnl4000_data { | |
46 | struct i2c_client *client; | |
47 | }; | |
48 | ||
49 | static const struct i2c_device_id vcnl4000_id[] = { | |
50 | { "vcnl4000", 0 }, | |
51 | { } | |
52 | }; | |
53 | MODULE_DEVICE_TABLE(i2c, vcnl4000_id); | |
54 | ||
55 | static int vcnl4000_measure(struct vcnl4000_data *data, u8 req_mask, | |
56 | u8 rdy_mask, u8 data_reg, int *val) | |
57 | { | |
58 | int tries = 20; | |
91f197e0 | 59 | __be16 buf; |
62a1efb9 PM |
60 | int ret; |
61 | ||
62 | ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, | |
63 | req_mask); | |
64 | if (ret < 0) | |
65 | return ret; | |
66 | ||
67 | /* wait for data to become ready */ | |
68 | while (tries--) { | |
69 | ret = i2c_smbus_read_byte_data(data->client, VCNL4000_COMMAND); | |
70 | if (ret < 0) | |
71 | return ret; | |
72 | if (ret & rdy_mask) | |
73 | break; | |
74 | msleep(20); /* measurement takes up to 100 ms */ | |
75 | } | |
76 | ||
77 | if (tries < 0) { | |
78 | dev_err(&data->client->dev, | |
79 | "vcnl4000_measure() failed, data not ready\n"); | |
80 | return -EIO; | |
81 | } | |
82 | ||
83 | ret = i2c_smbus_read_i2c_block_data(data->client, | |
84 | data_reg, sizeof(buf), (u8 *) &buf); | |
85 | if (ret < 0) | |
86 | return ret; | |
87 | ||
88 | *val = be16_to_cpu(buf); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static const struct iio_chan_spec vcnl4000_channels[] = { | |
94 | { | |
95 | .type = IIO_LIGHT, | |
bb7c5940 JC |
96 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | |
97 | BIT(IIO_CHAN_INFO_SCALE), | |
62a1efb9 PM |
98 | }, { |
99 | .type = IIO_PROXIMITY, | |
bb7c5940 | 100 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
62a1efb9 PM |
101 | } |
102 | }; | |
103 | ||
104 | static int vcnl4000_read_raw(struct iio_dev *indio_dev, | |
105 | struct iio_chan_spec const *chan, | |
106 | int *val, int *val2, long mask) | |
107 | { | |
108 | int ret = -EINVAL; | |
109 | struct vcnl4000_data *data = iio_priv(indio_dev); | |
110 | ||
111 | switch (mask) { | |
112 | case IIO_CHAN_INFO_RAW: | |
113 | switch (chan->type) { | |
114 | case IIO_LIGHT: | |
115 | ret = vcnl4000_measure(data, | |
116 | VCNL4000_AL_OD, VCNL4000_AL_RDY, | |
117 | VCNL4000_AL_RESULT_HI, val); | |
118 | if (ret < 0) | |
119 | return ret; | |
120 | ret = IIO_VAL_INT; | |
121 | break; | |
122 | case IIO_PROXIMITY: | |
123 | ret = vcnl4000_measure(data, | |
124 | VCNL4000_PS_OD, VCNL4000_PS_RDY, | |
125 | VCNL4000_PS_RESULT_HI, val); | |
126 | if (ret < 0) | |
127 | return ret; | |
128 | ret = IIO_VAL_INT; | |
129 | break; | |
130 | default: | |
131 | break; | |
132 | } | |
133 | break; | |
134 | case IIO_CHAN_INFO_SCALE: | |
135 | if (chan->type == IIO_LIGHT) { | |
136 | *val = 0; | |
137 | *val2 = 250000; | |
138 | ret = IIO_VAL_INT_PLUS_MICRO; | |
139 | } | |
140 | break; | |
141 | default: | |
142 | break; | |
143 | } | |
144 | ||
145 | return ret; | |
146 | } | |
147 | ||
148 | static const struct iio_info vcnl4000_info = { | |
149 | .read_raw = vcnl4000_read_raw, | |
150 | .driver_module = THIS_MODULE, | |
151 | }; | |
152 | ||
fc52692c GKH |
153 | static int vcnl4000_probe(struct i2c_client *client, |
154 | const struct i2c_device_id *id) | |
62a1efb9 PM |
155 | { |
156 | struct vcnl4000_data *data; | |
157 | struct iio_dev *indio_dev; | |
158 | int ret; | |
159 | ||
2669d723 | 160 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
62a1efb9 PM |
161 | if (!indio_dev) |
162 | return -ENOMEM; | |
163 | ||
164 | data = iio_priv(indio_dev); | |
165 | i2c_set_clientdata(client, indio_dev); | |
166 | data->client = client; | |
167 | ||
168 | ret = i2c_smbus_read_byte_data(data->client, VCNL4000_PROD_REV); | |
169 | if (ret < 0) | |
2669d723 | 170 | return ret; |
62a1efb9 PM |
171 | |
172 | dev_info(&client->dev, "VCNL4000 Ambient light/proximity sensor, Prod %02x, Rev: %02x\n", | |
173 | ret >> 4, ret & 0xf); | |
174 | ||
175 | indio_dev->dev.parent = &client->dev; | |
176 | indio_dev->info = &vcnl4000_info; | |
177 | indio_dev->channels = vcnl4000_channels; | |
178 | indio_dev->num_channels = ARRAY_SIZE(vcnl4000_channels); | |
179 | indio_dev->name = VCNL4000_DRV_NAME; | |
180 | indio_dev->modes = INDIO_DIRECT_MODE; | |
181 | ||
691dab42 | 182 | return devm_iio_device_register(&client->dev, indio_dev); |
62a1efb9 PM |
183 | } |
184 | ||
185 | static struct i2c_driver vcnl4000_driver = { | |
186 | .driver = { | |
187 | .name = VCNL4000_DRV_NAME, | |
188 | .owner = THIS_MODULE, | |
189 | }, | |
190 | .probe = vcnl4000_probe, | |
62a1efb9 PM |
191 | .id_table = vcnl4000_id, |
192 | }; | |
193 | ||
194 | module_i2c_driver(vcnl4000_driver); | |
195 | ||
196 | MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); | |
197 | MODULE_DESCRIPTION("Vishay VCNL4000 proximity/ambient light sensor driver"); | |
198 | MODULE_LICENSE("GPL"); |