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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
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36
37
38static 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
49static 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
55struct mc3230_data {
56 struct i2c_client *client;
57};
58
59static 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
82static 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
105static const struct iio_info mc3230_info = {
106 .read_raw = mc3230_read_raw,
107};
108
109static 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
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->info = &mc3230_info;
136 indio_dev->name = "mc3230";
137 indio_dev->modes = INDIO_DIRECT_MODE;
138 indio_dev->channels = mc3230_channels;
139 indio_dev->num_channels = ARRAY_SIZE(mc3230_channels);
140
141 ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);
142 if (ret < 0)
143 return ret;
144
145 ret = iio_device_register(indio_dev);
146 if (ret < 0) {
147 dev_err(&client->dev, "device_register failed\n");
148 mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);
149 }
150
151 return ret;
152}
153
154static int mc3230_remove(struct i2c_client *client)
155{
156 struct iio_dev *indio_dev = i2c_get_clientdata(client);
157
158 iio_device_unregister(indio_dev);
159
160 return mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY);
161}
162
163#ifdef CONFIG_PM_SLEEP
164static int mc3230_suspend(struct device *dev)
165{
166 struct mc3230_data *data;
167
168 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
169
170 return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);
171}
172
173static int mc3230_resume(struct device *dev)
174{
175 struct mc3230_data *data;
176
177 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
178
179 return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);
180}
181#endif
182
183static SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume);
184
185static const struct i2c_device_id mc3230_i2c_id[] = {
186 {"mc3230", 0},
187 {}
188};
189MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id);
190
191static struct i2c_driver mc3230_driver = {
192 .driver = {
193 .name = "mc3230",
194 .pm = &mc3230_pm_ops,
195 },
196 .probe = mc3230_probe,
197 .remove = mc3230_remove,
198 .id_table = mc3230_i2c_id,
199};
200
201module_i2c_driver(mc3230_driver);
202
203MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
204MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver");
205MODULE_LICENSE("GPL v2");
206
