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063e3303 HG |
1 | /** |
2 | * mCube MC3230 3-Axis Accelerometer | |
3 | * | |
4 | * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * IIO driver for mCube MC3230; 7-bit I2C address: 0x4c. | |
12 | */ | |
13 | ||
14 | #include <linux/i2c.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/iio/iio.h> | |
17 | #include <linux/iio/sysfs.h> | |
18 | ||
19 | #define MC3230_REG_XOUT 0x00 | |
20 | #define MC3230_REG_YOUT 0x01 | |
21 | #define MC3230_REG_ZOUT 0x02 | |
22 | ||
23 | #define MC3230_REG_MODE 0x07 | |
24 | #define MC3230_MODE_OPCON_MASK 0x03 | |
25 | #define MC3230_MODE_OPCON_WAKE 0x01 | |
26 | #define MC3230_MODE_OPCON_STANDBY 0x03 | |
27 | ||
28 | #define MC3230_REG_CHIP_ID 0x18 | |
29 | #define MC3230_CHIP_ID 0x01 | |
30 | ||
31 | #define MC3230_REG_PRODUCT_CODE 0x3b | |
32 | #define MC3230_PRODUCT_CODE 0x19 | |
33 | ||
34 | /* | |
35 | * The accelerometer has one measurement range: | |
36 | * | |
37 | * -1.5g - +1.5g (8-bit, signed) | |
38 | * | |
39 | * scale = (1.5 + 1.5) * 9.81 / (2^8 - 1) = 0.115411765 | |
40 | */ | |
41 | ||
42 | static const int mc3230_nscale = 115411765; | |
43 | ||
44 | #define MC3230_CHANNEL(reg, axis) { \ | |
45 | .type = IIO_ACCEL, \ | |
46 | .address = reg, \ | |
47 | .modified = 1, \ | |
48 | .channel2 = IIO_MOD_##axis, \ | |
49 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | |
50 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ | |
51 | } | |
52 | ||
53 | static const struct iio_chan_spec mc3230_channels[] = { | |
54 | MC3230_CHANNEL(MC3230_REG_XOUT, X), | |
55 | MC3230_CHANNEL(MC3230_REG_YOUT, Y), | |
56 | MC3230_CHANNEL(MC3230_REG_ZOUT, Z), | |
57 | }; | |
58 | ||
59 | struct mc3230_data { | |
60 | struct i2c_client *client; | |
61 | }; | |
62 | ||
63 | static int mc3230_set_opcon(struct mc3230_data *data, int opcon) | |
64 | { | |
65 | int ret; | |
66 | struct i2c_client *client = data->client; | |
67 | ||
68 | ret = i2c_smbus_read_byte_data(client, MC3230_REG_MODE); | |
69 | if (ret < 0) { | |
70 | dev_err(&client->dev, "failed to read mode reg: %d\n", ret); | |
71 | return ret; | |
72 | } | |
73 | ||
74 | ret &= ~MC3230_MODE_OPCON_MASK; | |
75 | ret |= opcon; | |
76 | ||
77 | ret = i2c_smbus_write_byte_data(client, MC3230_REG_MODE, ret); | |
78 | if (ret < 0) { | |
79 | dev_err(&client->dev, "failed to write mode reg: %d\n", ret); | |
80 | return ret; | |
81 | } | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int mc3230_read_raw(struct iio_dev *indio_dev, | |
87 | struct iio_chan_spec const *chan, | |
88 | int *val, int *val2, long mask) | |
89 | { | |
90 | struct mc3230_data *data = iio_priv(indio_dev); | |
91 | int ret; | |
92 | ||
93 | switch (mask) { | |
94 | case IIO_CHAN_INFO_RAW: | |
95 | ret = i2c_smbus_read_byte_data(data->client, chan->address); | |
96 | if (ret < 0) | |
97 | return ret; | |
98 | *val = sign_extend32(ret, 7); | |
99 | return IIO_VAL_INT; | |
100 | case IIO_CHAN_INFO_SCALE: | |
101 | *val = 0; | |
102 | *val2 = mc3230_nscale; | |
103 | return IIO_VAL_INT_PLUS_NANO; | |
104 | default: | |
105 | return -EINVAL; | |
106 | } | |
107 | } | |
108 | ||
109 | static const struct iio_info mc3230_info = { | |
063e3303 HG |
110 | .read_raw = mc3230_read_raw, |
111 | }; | |
112 | ||
113 | static int mc3230_probe(struct i2c_client *client, | |
114 | const struct i2c_device_id *id) | |
115 | { | |
116 | int ret; | |
117 | struct iio_dev *indio_dev; | |
118 | struct mc3230_data *data; | |
119 | ||
120 | /* First check chip-id and product-id */ | |
121 | ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID); | |
122 | if (ret != MC3230_CHIP_ID) | |
123 | return (ret < 0) ? ret : -ENODEV; | |
124 | ||
125 | ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE); | |
126 | if (ret != MC3230_PRODUCT_CODE) | |
127 | return (ret < 0) ? ret : -ENODEV; | |
128 | ||
129 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
130 | if (!indio_dev) { | |
131 | dev_err(&client->dev, "iio allocation failed!\n"); | |
132 | return -ENOMEM; | |
133 | } | |
134 | ||
135 | data = iio_priv(indio_dev); | |
136 | data->client = client; | |
137 | i2c_set_clientdata(client, indio_dev); | |
138 | ||
139 | indio_dev->dev.parent = &client->dev; | |
140 | indio_dev->info = &mc3230_info; | |
141 | indio_dev->name = "mc3230"; | |
142 | indio_dev->modes = INDIO_DIRECT_MODE; | |
143 | indio_dev->channels = mc3230_channels; | |
144 | indio_dev->num_channels = ARRAY_SIZE(mc3230_channels); | |
145 | ||
146 | ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); | |
147 | if (ret < 0) | |
148 | return ret; | |
149 | ||
150 | ret = iio_device_register(indio_dev); | |
151 | if (ret < 0) { | |
152 | dev_err(&client->dev, "device_register failed\n"); | |
153 | mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); | |
154 | } | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
159 | static int mc3230_remove(struct i2c_client *client) | |
160 | { | |
161 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
162 | ||
163 | iio_device_unregister(indio_dev); | |
164 | ||
165 | return mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY); | |
166 | } | |
167 | ||
168 | #ifdef CONFIG_PM_SLEEP | |
169 | static int mc3230_suspend(struct device *dev) | |
170 | { | |
171 | struct mc3230_data *data; | |
172 | ||
173 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
174 | ||
175 | return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); | |
176 | } | |
177 | ||
178 | static int mc3230_resume(struct device *dev) | |
179 | { | |
180 | struct mc3230_data *data; | |
181 | ||
182 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
183 | ||
184 | return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); | |
185 | } | |
186 | #endif | |
187 | ||
188 | static SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume); | |
189 | ||
190 | static const struct i2c_device_id mc3230_i2c_id[] = { | |
191 | {"mc3230", 0}, | |
192 | {} | |
193 | }; | |
194 | MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id); | |
195 | ||
196 | static struct i2c_driver mc3230_driver = { | |
197 | .driver = { | |
198 | .name = "mc3230", | |
199 | .pm = &mc3230_pm_ops, | |
200 | }, | |
201 | .probe = mc3230_probe, | |
202 | .remove = mc3230_remove, | |
203 | .id_table = mc3230_i2c_id, | |
204 | }; | |
205 | ||
206 | module_i2c_driver(mc3230_driver); | |
207 | ||
208 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
209 | MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver"); | |
210 | MODULE_LICENSE("GPL v2"); |