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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
36
37
38
39
40
41
42static 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
53static 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
59struct mc3230_data {
60 struct i2c_client *client;
61};
62
63static 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
86static 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
109static const struct iio_info mc3230_info = {
110 .driver_module = THIS_MODULE,
111 .read_raw = mc3230_read_raw,
112};
113
114static int mc3230_probe(struct i2c_client *client,
115 const struct i2c_device_id *id)
116{
117 int ret;
118 struct iio_dev *indio_dev;
119 struct mc3230_data *data;
120
121
122 ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID);
123 if (ret != MC3230_CHIP_ID)
124 return (ret < 0) ? ret : -ENODEV;
125
126 ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE);
127 if (ret != MC3230_PRODUCT_CODE)
128 return (ret < 0) ? ret : -ENODEV;
129
130 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
131 if (!indio_dev) {
132 dev_err(&client->dev, "iio allocation failed!\n");
133 return -ENOMEM;
134 }
135
136 data = iio_priv(indio_dev);
137 data->client = client;
138 i2c_set_clientdata(client, indio_dev);
139
140 indio_dev->dev.parent = &client->dev;
141 indio_dev->info = &mc3230_info;
142 indio_dev->name = "mc3230";
143 indio_dev->modes = INDIO_DIRECT_MODE;
144 indio_dev->channels = mc3230_channels;
145 indio_dev->num_channels = ARRAY_SIZE(mc3230_channels);
146
147 ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);
148 if (ret < 0)
149 return ret;
150
151 ret = iio_device_register(indio_dev);
152 if (ret < 0) {
153 dev_err(&client->dev, "device_register failed\n");
154 mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);
155 }
156
157 return ret;
158}
159
160static int mc3230_remove(struct i2c_client *client)
161{
162 struct iio_dev *indio_dev = i2c_get_clientdata(client);
163
164 iio_device_unregister(indio_dev);
165
166 return mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY);
167}
168
169#ifdef CONFIG_PM_SLEEP
170static int mc3230_suspend(struct device *dev)
171{
172 struct mc3230_data *data;
173
174 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
175
176 return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);
177}
178
179static int mc3230_resume(struct device *dev)
180{
181 struct mc3230_data *data;
182
183 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
184
185 return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);
186}
187#endif
188
189static SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume);
190
191static const struct i2c_device_id mc3230_i2c_id[] = {
192 {"mc3230", 0},
193 {}
194};
195MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id);
196
197static struct i2c_driver mc3230_driver = {
198 .driver = {
199 .name = "mc3230",
200 .pm = &mc3230_pm_ops,
201 },
202 .probe = mc3230_probe,
203 .remove = mc3230_remove,
204 .id_table = mc3230_i2c_id,
205};
206
207module_i2c_driver(mc3230_driver);
208
209MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
210MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver");
211MODULE_LICENSE("GPL v2");
212
