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1 | /* |
2 | * IIO driver for Domintech DMARD06 accelerometer | |
3 | * | |
4 | * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/iio/iio.h> | |
14 | ||
15 | #define DMARD06_DRV_NAME "dmard06" | |
16 | ||
17 | /* Device data registers */ | |
18 | #define DMARD06_CHIP_ID_REG 0x0f | |
19 | #define DMARD06_TOUT_REG 0x40 | |
20 | #define DMARD06_XOUT_REG 0x41 | |
21 | #define DMARD06_YOUT_REG 0x42 | |
22 | #define DMARD06_ZOUT_REG 0x43 | |
23 | #define DMARD06_CTRL1_REG 0x44 | |
24 | ||
25 | /* Device ID value */ | |
26 | #define DMARD05_CHIP_ID 0x05 | |
27 | #define DMARD06_CHIP_ID 0x06 | |
28 | #define DMARD07_CHIP_ID 0x07 | |
29 | ||
30 | /* Device values */ | |
31 | #define DMARD05_AXIS_SCALE_VAL 15625 | |
32 | #define DMARD06_AXIS_SCALE_VAL 31250 | |
33 | #define DMARD06_TEMP_CENTER_VAL 25 | |
34 | #define DMARD06_SIGN_BIT 7 | |
35 | ||
36 | /* Device power modes */ | |
37 | #define DMARD06_MODE_NORMAL 0x27 | |
38 | #define DMARD06_MODE_POWERDOWN 0x00 | |
39 | ||
40 | /* Device channels */ | |
41 | #define DMARD06_ACCEL_CHANNEL(_axis, _reg) { \ | |
42 | .type = IIO_ACCEL, \ | |
43 | .address = _reg, \ | |
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 | .modified = 1, \ | |
48 | } | |
49 | ||
50 | #define DMARD06_TEMP_CHANNEL(_reg) { \ | |
51 | .type = IIO_TEMP, \ | |
52 | .address = _reg, \ | |
53 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ | |
54 | BIT(IIO_CHAN_INFO_OFFSET), \ | |
55 | } | |
56 | ||
57 | struct dmard06_data { | |
58 | struct i2c_client *client; | |
59 | u8 chip_id; | |
60 | }; | |
61 | ||
62 | static const struct iio_chan_spec dmard06_channels[] = { | |
63 | DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG), | |
64 | DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG), | |
65 | DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG), | |
66 | DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG), | |
67 | }; | |
68 | ||
69 | static int dmard06_read_raw(struct iio_dev *indio_dev, | |
70 | struct iio_chan_spec const *chan, | |
71 | int *val, int *val2, long mask) | |
72 | { | |
73 | struct dmard06_data *dmard06 = iio_priv(indio_dev); | |
74 | int ret; | |
75 | ||
76 | switch (mask) { | |
77 | case IIO_CHAN_INFO_RAW: | |
78 | ret = i2c_smbus_read_byte_data(dmard06->client, | |
79 | chan->address); | |
80 | if (ret < 0) { | |
81 | dev_err(&dmard06->client->dev, | |
82 | "Error reading data: %d\n", ret); | |
83 | return ret; | |
84 | } | |
85 | ||
86 | *val = sign_extend32(ret, DMARD06_SIGN_BIT); | |
87 | ||
88 | if (dmard06->chip_id == DMARD06_CHIP_ID) | |
89 | *val = *val >> 1; | |
90 | ||
91 | switch (chan->type) { | |
92 | case IIO_ACCEL: | |
93 | return IIO_VAL_INT; | |
94 | case IIO_TEMP: | |
95 | if (dmard06->chip_id != DMARD06_CHIP_ID) | |
96 | *val = *val / 2; | |
97 | return IIO_VAL_INT; | |
98 | default: | |
99 | return -EINVAL; | |
100 | } | |
101 | case IIO_CHAN_INFO_OFFSET: | |
102 | switch (chan->type) { | |
103 | case IIO_TEMP: | |
104 | *val = DMARD06_TEMP_CENTER_VAL; | |
105 | return IIO_VAL_INT; | |
106 | default: | |
107 | return -EINVAL; | |
108 | } | |
109 | case IIO_CHAN_INFO_SCALE: | |
110 | switch (chan->type) { | |
111 | case IIO_ACCEL: | |
112 | *val = 0; | |
113 | if (dmard06->chip_id == DMARD06_CHIP_ID) | |
114 | *val2 = DMARD06_AXIS_SCALE_VAL; | |
115 | else | |
116 | *val2 = DMARD05_AXIS_SCALE_VAL; | |
117 | return IIO_VAL_INT_PLUS_MICRO; | |
118 | default: | |
119 | return -EINVAL; | |
120 | } | |
121 | default: | |
122 | return -EINVAL; | |
123 | } | |
124 | } | |
125 | ||
126 | static const struct iio_info dmard06_info = { | |
127 | .driver_module = THIS_MODULE, | |
128 | .read_raw = dmard06_read_raw, | |
129 | }; | |
130 | ||
131 | static int dmard06_probe(struct i2c_client *client, | |
132 | const struct i2c_device_id *id) | |
133 | { | |
134 | int ret; | |
135 | struct iio_dev *indio_dev; | |
136 | struct dmard06_data *dmard06; | |
137 | ||
138 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
139 | dev_err(&client->dev, "I2C check functionality failed\n"); | |
140 | return -ENXIO; | |
141 | } | |
142 | ||
143 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06)); | |
144 | if (!indio_dev) { | |
145 | dev_err(&client->dev, "Failed to allocate iio device\n"); | |
146 | return -ENOMEM; | |
147 | } | |
148 | ||
149 | dmard06 = iio_priv(indio_dev); | |
150 | dmard06->client = client; | |
151 | ||
152 | ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG); | |
153 | if (ret < 0) { | |
154 | dev_err(&client->dev, "Error reading chip id: %d\n", ret); | |
155 | return ret; | |
156 | } | |
157 | ||
158 | if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID && | |
159 | ret != DMARD07_CHIP_ID) { | |
160 | dev_err(&client->dev, "Invalid chip id: %02d\n", ret); | |
161 | return -ENODEV; | |
162 | } | |
163 | ||
164 | dmard06->chip_id = ret; | |
165 | ||
166 | i2c_set_clientdata(client, indio_dev); | |
167 | indio_dev->dev.parent = &client->dev; | |
168 | indio_dev->name = DMARD06_DRV_NAME; | |
169 | indio_dev->modes = INDIO_DIRECT_MODE; | |
170 | indio_dev->channels = dmard06_channels; | |
171 | indio_dev->num_channels = ARRAY_SIZE(dmard06_channels); | |
172 | indio_dev->info = &dmard06_info; | |
173 | ||
174 | return devm_iio_device_register(&client->dev, indio_dev); | |
175 | } | |
176 | ||
177 | #ifdef CONFIG_PM_SLEEP | |
178 | static int dmard06_suspend(struct device *dev) | |
179 | { | |
180 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
181 | struct dmard06_data *dmard06 = iio_priv(indio_dev); | |
182 | int ret; | |
183 | ||
184 | ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG, | |
185 | DMARD06_MODE_POWERDOWN); | |
186 | if (ret < 0) | |
187 | return ret; | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | static int dmard06_resume(struct device *dev) | |
193 | { | |
194 | struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); | |
195 | struct dmard06_data *dmard06 = iio_priv(indio_dev); | |
196 | int ret; | |
197 | ||
198 | ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG, | |
199 | DMARD06_MODE_NORMAL); | |
200 | if (ret < 0) | |
201 | return ret; | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, dmard06_resume); | |
207 | #define DMARD06_PM_OPS (&dmard06_pm_ops) | |
208 | #else | |
209 | #define DMARD06_PM_OPS NULL | |
210 | #endif | |
211 | ||
212 | static const struct i2c_device_id dmard06_id[] = { | |
213 | { "dmard05", 0 }, | |
214 | { "dmard06", 0 }, | |
215 | { "dmard07", 0 }, | |
216 | { } | |
217 | }; | |
218 | MODULE_DEVICE_TABLE(i2c, dmard06_id); | |
219 | ||
220 | static const struct of_device_id dmard06_of_match[] = { | |
221 | { .compatible = "domintech,dmard05" }, | |
222 | { .compatible = "domintech,dmard06" }, | |
223 | { .compatible = "domintech,dmard07" }, | |
224 | { } | |
225 | }; | |
226 | MODULE_DEVICE_TABLE(of, dmard06_of_match); | |
227 | ||
228 | static struct i2c_driver dmard06_driver = { | |
229 | .probe = dmard06_probe, | |
230 | .id_table = dmard06_id, | |
231 | .driver = { | |
232 | .name = DMARD06_DRV_NAME, | |
233 | .of_match_table = of_match_ptr(dmard06_of_match), | |
234 | .pm = DMARD06_PM_OPS, | |
235 | }, | |
236 | }; | |
237 | module_i2c_driver(dmard06_driver); | |
238 | ||
239 | MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>"); | |
240 | MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver"); | |
241 | MODULE_LICENSE("GPL v2"); |