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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
063e3303 HG |
2 | /** |
3 | * mCube MC3230 3-Axis Accelerometer | |
4 | * | |
5 | * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com> | |
6 | * | |
063e3303 HG |
7 | * IIO driver for mCube MC3230; 7-bit I2C address: 0x4c. |
8 | */ | |
9 | ||
10 | #include <linux/i2c.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/iio/iio.h> | |
13 | #include <linux/iio/sysfs.h> | |
14 | ||
15 | #define MC3230_REG_XOUT 0x00 | |
16 | #define MC3230_REG_YOUT 0x01 | |
17 | #define MC3230_REG_ZOUT 0x02 | |
18 | ||
19 | #define MC3230_REG_MODE 0x07 | |
20 | #define MC3230_MODE_OPCON_MASK 0x03 | |
21 | #define MC3230_MODE_OPCON_WAKE 0x01 | |
22 | #define MC3230_MODE_OPCON_STANDBY 0x03 | |
23 | ||
24 | #define MC3230_REG_CHIP_ID 0x18 | |
25 | #define MC3230_CHIP_ID 0x01 | |
26 | ||
27 | #define MC3230_REG_PRODUCT_CODE 0x3b | |
28 | #define MC3230_PRODUCT_CODE 0x19 | |
29 | ||
30 | /* | |
31 | * The accelerometer has one measurement range: | |
32 | * | |
33 | * -1.5g - +1.5g (8-bit, signed) | |
34 | * | |
35 | * scale = (1.5 + 1.5) * 9.81 / (2^8 - 1) = 0.115411765 | |
36 | */ | |
37 | ||
38 | static const int mc3230_nscale = 115411765; | |
39 | ||
40 | #define MC3230_CHANNEL(reg, axis) { \ | |
41 | .type = IIO_ACCEL, \ | |
42 | .address = reg, \ | |
43 | .modified = 1, \ | |
44 | .channel2 = IIO_MOD_##axis, \ | |
45 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | |
46 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ | |
47 | } | |
48 | ||
49 | static const struct iio_chan_spec mc3230_channels[] = { | |
50 | MC3230_CHANNEL(MC3230_REG_XOUT, X), | |
51 | MC3230_CHANNEL(MC3230_REG_YOUT, Y), | |
52 | MC3230_CHANNEL(MC3230_REG_ZOUT, Z), | |
53 | }; | |
54 | ||
55 | struct mc3230_data { | |
56 | struct i2c_client *client; | |
57 | }; | |
58 | ||
59 | static int mc3230_set_opcon(struct mc3230_data *data, int opcon) | |
60 | { | |
61 | int ret; | |
62 | struct i2c_client *client = data->client; | |
63 | ||
64 | ret = i2c_smbus_read_byte_data(client, MC3230_REG_MODE); | |
65 | if (ret < 0) { | |
66 | dev_err(&client->dev, "failed to read mode reg: %d\n", ret); | |
67 | return ret; | |
68 | } | |
69 | ||
70 | ret &= ~MC3230_MODE_OPCON_MASK; | |
71 | ret |= opcon; | |
72 | ||
73 | ret = i2c_smbus_write_byte_data(client, MC3230_REG_MODE, ret); | |
74 | if (ret < 0) { | |
75 | dev_err(&client->dev, "failed to write mode reg: %d\n", ret); | |
76 | return ret; | |
77 | } | |
78 | ||
79 | return 0; | |
80 | } | |
81 | ||
82 | static int mc3230_read_raw(struct iio_dev *indio_dev, | |
83 | struct iio_chan_spec const *chan, | |
84 | int *val, int *val2, long mask) | |
85 | { | |
86 | struct mc3230_data *data = iio_priv(indio_dev); | |
87 | int ret; | |
88 | ||
89 | switch (mask) { | |
90 | case IIO_CHAN_INFO_RAW: | |
91 | ret = i2c_smbus_read_byte_data(data->client, chan->address); | |
92 | if (ret < 0) | |
93 | return ret; | |
94 | *val = sign_extend32(ret, 7); | |
95 | return IIO_VAL_INT; | |
96 | case IIO_CHAN_INFO_SCALE: | |
97 | *val = 0; | |
98 | *val2 = mc3230_nscale; | |
99 | return IIO_VAL_INT_PLUS_NANO; | |
100 | default: | |
101 | return -EINVAL; | |
102 | } | |
103 | } | |
104 | ||
105 | static const struct iio_info mc3230_info = { | |
063e3303 HG |
106 | .read_raw = mc3230_read_raw, |
107 | }; | |
108 | ||
109 | static int mc3230_probe(struct i2c_client *client, | |
110 | const struct i2c_device_id *id) | |
111 | { | |
112 | int ret; | |
113 | struct iio_dev *indio_dev; | |
114 | struct mc3230_data *data; | |
115 | ||
116 | /* First check chip-id and product-id */ | |
117 | ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID); | |
118 | if (ret != MC3230_CHIP_ID) | |
119 | return (ret < 0) ? ret : -ENODEV; | |
120 | ||
121 | ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE); | |
122 | if (ret != MC3230_PRODUCT_CODE) | |
123 | return (ret < 0) ? ret : -ENODEV; | |
124 | ||
125 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
126 | if (!indio_dev) { | |
127 | dev_err(&client->dev, "iio allocation failed!\n"); | |
128 | return -ENOMEM; | |
129 | } | |
130 | ||
131 | data = iio_priv(indio_dev); | |
132 | data->client = client; | |
133 | i2c_set_clientdata(client, indio_dev); | |
134 | ||
135 | indio_dev->dev.parent = &client->dev; | |
136 | indio_dev->info = &mc3230_info; | |
137 | indio_dev->name = "mc3230"; | |
138 | indio_dev->modes = INDIO_DIRECT_MODE; | |
139 | indio_dev->channels = mc3230_channels; | |
140 | indio_dev->num_channels = ARRAY_SIZE(mc3230_channels); | |
141 | ||
142 | ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); | |
143 | if (ret < 0) | |
144 | return ret; | |
145 | ||
146 | ret = iio_device_register(indio_dev); | |
147 | if (ret < 0) { | |
148 | dev_err(&client->dev, "device_register failed\n"); | |
149 | mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); | |
150 | } | |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
155 | static int mc3230_remove(struct i2c_client *client) | |
156 | { | |
157 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
158 | ||
159 | iio_device_unregister(indio_dev); | |
160 | ||
161 | return mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY); | |
162 | } | |
163 | ||
164 | #ifdef CONFIG_PM_SLEEP | |
165 | static int mc3230_suspend(struct device *dev) | |
166 | { | |
167 | struct mc3230_data *data; | |
168 | ||
169 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
170 | ||
171 | return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); | |
172 | } | |
173 | ||
174 | static int mc3230_resume(struct device *dev) | |
175 | { | |
176 | struct mc3230_data *data; | |
177 | ||
178 | data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); | |
179 | ||
180 | return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); | |
181 | } | |
182 | #endif | |
183 | ||
184 | static SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume); | |
185 | ||
186 | static const struct i2c_device_id mc3230_i2c_id[] = { | |
187 | {"mc3230", 0}, | |
188 | {} | |
189 | }; | |
190 | MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id); | |
191 | ||
192 | static struct i2c_driver mc3230_driver = { | |
193 | .driver = { | |
194 | .name = "mc3230", | |
195 | .pm = &mc3230_pm_ops, | |
196 | }, | |
197 | .probe = mc3230_probe, | |
198 | .remove = mc3230_remove, | |
199 | .id_table = mc3230_i2c_id, | |
200 | }; | |
201 | ||
202 | module_i2c_driver(mc3230_driver); | |
203 | ||
204 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); | |
205 | MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver"); | |
206 | MODULE_LICENSE("GPL v2"); |