1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * mCube MC3230 3-Axis Accelerometer |
4 | * |
5 | * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com> |
6 | * |
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, value: 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(client: data->client, command: chan->address); |
92 | if (ret < 0) |
93 | return ret; |
94 | *val = sign_extend32(value: ret, index: 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 = { |
106 | .read_raw = mc3230_read_raw, |
107 | }; |
108 | |
109 | static int mc3230_probe(struct i2c_client *client) |
110 | { |
111 | int ret; |
112 | struct iio_dev *indio_dev; |
113 | struct mc3230_data *data; |
114 | |
115 | /* First check chip-id and product-id */ |
116 | ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID); |
117 | if (ret != MC3230_CHIP_ID) |
118 | return (ret < 0) ? ret : -ENODEV; |
119 | |
120 | ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE); |
121 | if (ret != MC3230_PRODUCT_CODE) |
122 | return (ret < 0) ? ret : -ENODEV; |
123 | |
124 | indio_dev = devm_iio_device_alloc(parent: &client->dev, sizeof_priv: sizeof(*data)); |
125 | if (!indio_dev) { |
126 | dev_err(&client->dev, "iio allocation failed!\n" ); |
127 | return -ENOMEM; |
128 | } |
129 | |
130 | data = iio_priv(indio_dev); |
131 | data->client = client; |
132 | i2c_set_clientdata(client, data: indio_dev); |
133 | |
134 | indio_dev->info = &mc3230_info; |
135 | indio_dev->name = "mc3230" ; |
136 | indio_dev->modes = INDIO_DIRECT_MODE; |
137 | indio_dev->channels = mc3230_channels; |
138 | indio_dev->num_channels = ARRAY_SIZE(mc3230_channels); |
139 | |
140 | ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); |
141 | if (ret < 0) |
142 | return ret; |
143 | |
144 | ret = iio_device_register(indio_dev); |
145 | if (ret < 0) { |
146 | dev_err(&client->dev, "device_register failed\n" ); |
147 | mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); |
148 | } |
149 | |
150 | return ret; |
151 | } |
152 | |
153 | static void mc3230_remove(struct i2c_client *client) |
154 | { |
155 | struct iio_dev *indio_dev = i2c_get_clientdata(client); |
156 | |
157 | iio_device_unregister(indio_dev); |
158 | |
159 | mc3230_set_opcon(data: iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY); |
160 | } |
161 | |
162 | static int mc3230_suspend(struct device *dev) |
163 | { |
164 | struct mc3230_data *data; |
165 | |
166 | data = iio_priv(indio_dev: i2c_get_clientdata(to_i2c_client(dev))); |
167 | |
168 | return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); |
169 | } |
170 | |
171 | static int mc3230_resume(struct device *dev) |
172 | { |
173 | struct mc3230_data *data; |
174 | |
175 | data = iio_priv(indio_dev: i2c_get_clientdata(to_i2c_client(dev))); |
176 | |
177 | return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); |
178 | } |
179 | |
180 | static DEFINE_SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume); |
181 | |
182 | static const struct i2c_device_id mc3230_i2c_id[] = { |
183 | {"mc3230" , 0}, |
184 | {} |
185 | }; |
186 | MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id); |
187 | |
188 | static struct i2c_driver mc3230_driver = { |
189 | .driver = { |
190 | .name = "mc3230" , |
191 | .pm = pm_sleep_ptr(&mc3230_pm_ops), |
192 | }, |
193 | .probe = mc3230_probe, |
194 | .remove = mc3230_remove, |
195 | .id_table = mc3230_i2c_id, |
196 | }; |
197 | |
198 | module_i2c_driver(mc3230_driver); |
199 | |
200 | MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>" ); |
201 | MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver" ); |
202 | MODULE_LICENSE("GPL v2" ); |
203 | |