1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * IIO driver for Domintech DMARD06 accelerometer |
4 | * |
5 | * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com> |
6 | */ |
7 | |
8 | #include <linux/module.h> |
9 | #include <linux/mod_devicetable.h> |
10 | #include <linux/i2c.h> |
11 | #include <linux/iio/iio.h> |
12 | |
13 | #define DMARD06_DRV_NAME "dmard06" |
14 | |
15 | /* Device data registers */ |
16 | #define DMARD06_CHIP_ID_REG 0x0f |
17 | #define DMARD06_TOUT_REG 0x40 |
18 | #define DMARD06_XOUT_REG 0x41 |
19 | #define DMARD06_YOUT_REG 0x42 |
20 | #define DMARD06_ZOUT_REG 0x43 |
21 | #define DMARD06_CTRL1_REG 0x44 |
22 | |
23 | /* Device ID value */ |
24 | #define DMARD05_CHIP_ID 0x05 |
25 | #define DMARD06_CHIP_ID 0x06 |
26 | #define DMARD07_CHIP_ID 0x07 |
27 | |
28 | /* Device values */ |
29 | #define DMARD05_AXIS_SCALE_VAL 15625 |
30 | #define DMARD06_AXIS_SCALE_VAL 31250 |
31 | #define DMARD06_TEMP_CENTER_VAL 25 |
32 | #define DMARD06_SIGN_BIT 7 |
33 | |
34 | /* Device power modes */ |
35 | #define DMARD06_MODE_NORMAL 0x27 |
36 | #define DMARD06_MODE_POWERDOWN 0x00 |
37 | |
38 | /* Device channels */ |
39 | #define DMARD06_ACCEL_CHANNEL(_axis, _reg) { \ |
40 | .type = IIO_ACCEL, \ |
41 | .address = _reg, \ |
42 | .channel2 = IIO_MOD_##_axis, \ |
43 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ |
44 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ |
45 | .modified = 1, \ |
46 | } |
47 | |
48 | #define DMARD06_TEMP_CHANNEL(_reg) { \ |
49 | .type = IIO_TEMP, \ |
50 | .address = _reg, \ |
51 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ |
52 | BIT(IIO_CHAN_INFO_OFFSET), \ |
53 | } |
54 | |
55 | struct dmard06_data { |
56 | struct i2c_client *client; |
57 | u8 chip_id; |
58 | }; |
59 | |
60 | static const struct iio_chan_spec dmard06_channels[] = { |
61 | DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG), |
62 | DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG), |
63 | DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG), |
64 | DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG), |
65 | }; |
66 | |
67 | static int dmard06_read_raw(struct iio_dev *indio_dev, |
68 | struct iio_chan_spec const *chan, |
69 | int *val, int *val2, long mask) |
70 | { |
71 | struct dmard06_data *dmard06 = iio_priv(indio_dev); |
72 | int ret; |
73 | |
74 | switch (mask) { |
75 | case IIO_CHAN_INFO_RAW: |
76 | ret = i2c_smbus_read_byte_data(client: dmard06->client, |
77 | command: chan->address); |
78 | if (ret < 0) { |
79 | dev_err(&dmard06->client->dev, |
80 | "Error reading data: %d\n" , ret); |
81 | return ret; |
82 | } |
83 | |
84 | *val = sign_extend32(value: ret, DMARD06_SIGN_BIT); |
85 | |
86 | if (dmard06->chip_id == DMARD06_CHIP_ID) |
87 | *val = *val >> 1; |
88 | |
89 | switch (chan->type) { |
90 | case IIO_ACCEL: |
91 | return IIO_VAL_INT; |
92 | case IIO_TEMP: |
93 | if (dmard06->chip_id != DMARD06_CHIP_ID) |
94 | *val = *val / 2; |
95 | return IIO_VAL_INT; |
96 | default: |
97 | return -EINVAL; |
98 | } |
99 | case IIO_CHAN_INFO_OFFSET: |
100 | switch (chan->type) { |
101 | case IIO_TEMP: |
102 | *val = DMARD06_TEMP_CENTER_VAL; |
103 | return IIO_VAL_INT; |
104 | default: |
105 | return -EINVAL; |
106 | } |
107 | case IIO_CHAN_INFO_SCALE: |
108 | switch (chan->type) { |
109 | case IIO_ACCEL: |
110 | *val = 0; |
111 | if (dmard06->chip_id == DMARD06_CHIP_ID) |
112 | *val2 = DMARD06_AXIS_SCALE_VAL; |
113 | else |
114 | *val2 = DMARD05_AXIS_SCALE_VAL; |
115 | return IIO_VAL_INT_PLUS_MICRO; |
116 | default: |
117 | return -EINVAL; |
118 | } |
119 | default: |
120 | return -EINVAL; |
121 | } |
122 | } |
123 | |
124 | static const struct iio_info dmard06_info = { |
125 | .read_raw = dmard06_read_raw, |
126 | }; |
127 | |
128 | static int dmard06_probe(struct i2c_client *client) |
129 | { |
130 | int ret; |
131 | struct iio_dev *indio_dev; |
132 | struct dmard06_data *dmard06; |
133 | |
134 | if (!i2c_check_functionality(adap: client->adapter, I2C_FUNC_I2C)) { |
135 | dev_err(&client->dev, "I2C check functionality failed\n" ); |
136 | return -ENXIO; |
137 | } |
138 | |
139 | indio_dev = devm_iio_device_alloc(parent: &client->dev, sizeof_priv: sizeof(*dmard06)); |
140 | if (!indio_dev) { |
141 | dev_err(&client->dev, "Failed to allocate iio device\n" ); |
142 | return -ENOMEM; |
143 | } |
144 | |
145 | dmard06 = iio_priv(indio_dev); |
146 | dmard06->client = client; |
147 | |
148 | ret = i2c_smbus_read_byte_data(client: dmard06->client, DMARD06_CHIP_ID_REG); |
149 | if (ret < 0) { |
150 | dev_err(&client->dev, "Error reading chip id: %d\n" , ret); |
151 | return ret; |
152 | } |
153 | |
154 | if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID && |
155 | ret != DMARD07_CHIP_ID) { |
156 | dev_err(&client->dev, "Invalid chip id: %02d\n" , ret); |
157 | return -ENODEV; |
158 | } |
159 | |
160 | dmard06->chip_id = ret; |
161 | |
162 | i2c_set_clientdata(client, data: indio_dev); |
163 | indio_dev->name = DMARD06_DRV_NAME; |
164 | indio_dev->modes = INDIO_DIRECT_MODE; |
165 | indio_dev->channels = dmard06_channels; |
166 | indio_dev->num_channels = ARRAY_SIZE(dmard06_channels); |
167 | indio_dev->info = &dmard06_info; |
168 | |
169 | return devm_iio_device_register(&client->dev, indio_dev); |
170 | } |
171 | |
172 | static int dmard06_suspend(struct device *dev) |
173 | { |
174 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
175 | struct dmard06_data *dmard06 = iio_priv(indio_dev); |
176 | int ret; |
177 | |
178 | ret = i2c_smbus_write_byte_data(client: dmard06->client, DMARD06_CTRL1_REG, |
179 | DMARD06_MODE_POWERDOWN); |
180 | if (ret < 0) |
181 | return ret; |
182 | |
183 | return 0; |
184 | } |
185 | |
186 | static int dmard06_resume(struct device *dev) |
187 | { |
188 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); |
189 | struct dmard06_data *dmard06 = iio_priv(indio_dev); |
190 | int ret; |
191 | |
192 | ret = i2c_smbus_write_byte_data(client: dmard06->client, DMARD06_CTRL1_REG, |
193 | DMARD06_MODE_NORMAL); |
194 | if (ret < 0) |
195 | return ret; |
196 | |
197 | return 0; |
198 | } |
199 | |
200 | static DEFINE_SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, |
201 | dmard06_resume); |
202 | |
203 | static const struct i2c_device_id dmard06_id[] = { |
204 | { "dmard05" , 0 }, |
205 | { "dmard06" , 0 }, |
206 | { "dmard07" , 0 }, |
207 | { } |
208 | }; |
209 | MODULE_DEVICE_TABLE(i2c, dmard06_id); |
210 | |
211 | static const struct of_device_id dmard06_of_match[] = { |
212 | { .compatible = "domintech,dmard05" }, |
213 | { .compatible = "domintech,dmard06" }, |
214 | { .compatible = "domintech,dmard07" }, |
215 | { } |
216 | }; |
217 | MODULE_DEVICE_TABLE(of, dmard06_of_match); |
218 | |
219 | static struct i2c_driver dmard06_driver = { |
220 | .probe = dmard06_probe, |
221 | .id_table = dmard06_id, |
222 | .driver = { |
223 | .name = DMARD06_DRV_NAME, |
224 | .of_match_table = dmard06_of_match, |
225 | .pm = pm_sleep_ptr(&dmard06_pm_ops), |
226 | }, |
227 | }; |
228 | module_i2c_driver(dmard06_driver); |
229 | |
230 | MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>" ); |
231 | MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver" ); |
232 | MODULE_LICENSE("GPL v2" ); |
233 | |