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b87b0c0f DES |
1 | /* |
2 | * m62332.c - Support for Mitsubishi m62332 DAC | |
3 | * | |
4 | * Copyright (c) 2014 Dmitry Eremin-Solenikov | |
5 | * | |
6 | * Based on max517 driver: | |
7 | * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/slab.h> | |
22 | #include <linux/i2c.h> | |
23 | #include <linux/err.h> | |
24 | ||
25 | #include <linux/iio/iio.h> | |
26 | #include <linux/iio/driver.h> | |
27 | ||
28 | #include <linux/regulator/consumer.h> | |
29 | ||
30 | #define M62332_CHANNELS 2 | |
31 | ||
32 | struct m62332_data { | |
33 | struct i2c_client *client; | |
b87b0c0f DES |
34 | struct regulator *vcc; |
35 | struct mutex mutex; | |
36 | u8 raw[M62332_CHANNELS]; | |
37 | #ifdef CONFIG_PM_SLEEP | |
38 | u8 save[M62332_CHANNELS]; | |
39 | #endif | |
40 | }; | |
41 | ||
acf2f67d | 42 | static int m62332_set_value(struct iio_dev *indio_dev, u8 val, int channel) |
b87b0c0f DES |
43 | { |
44 | struct m62332_data *data = iio_priv(indio_dev); | |
45 | struct i2c_client *client = data->client; | |
46 | u8 outbuf[2]; | |
47 | int res; | |
48 | ||
49 | if (val == data->raw[channel]) | |
50 | return 0; | |
51 | ||
52 | outbuf[0] = channel; | |
53 | outbuf[1] = val; | |
54 | ||
55 | mutex_lock(&data->mutex); | |
56 | ||
57 | if (val) { | |
58 | res = regulator_enable(data->vcc); | |
59 | if (res) | |
60 | goto out; | |
61 | } | |
62 | ||
7d2da8ea HK |
63 | res = i2c_master_send(client, outbuf, ARRAY_SIZE(outbuf)); |
64 | if (res >= 0 && res != ARRAY_SIZE(outbuf)) | |
b87b0c0f DES |
65 | res = -EIO; |
66 | if (res < 0) | |
67 | goto out; | |
68 | ||
69 | data->raw[channel] = val; | |
70 | ||
71 | if (!val) | |
72 | regulator_disable(data->vcc); | |
73 | ||
74 | mutex_unlock(&data->mutex); | |
75 | ||
76 | return 0; | |
77 | ||
78 | out: | |
79 | mutex_unlock(&data->mutex); | |
80 | ||
81 | return res; | |
82 | } | |
83 | ||
84 | static int m62332_read_raw(struct iio_dev *indio_dev, | |
85 | struct iio_chan_spec const *chan, | |
86 | int *val, | |
87 | int *val2, | |
acf2f67d | 88 | long mask) |
b87b0c0f DES |
89 | { |
90 | struct m62332_data *data = iio_priv(indio_dev); | |
39991053 | 91 | int ret; |
b87b0c0f | 92 | |
acf2f67d | 93 | switch (mask) { |
b87b0c0f DES |
94 | case IIO_CHAN_INFO_SCALE: |
95 | /* Corresponds to Vref / 2^(bits) */ | |
39991053 HK |
96 | ret = regulator_get_voltage(data->vcc); |
97 | if (ret < 0) | |
98 | return ret; | |
99 | ||
100 | *val = ret / 1000; /* mV */ | |
b87b0c0f | 101 | *val2 = 8; |
acf2f67d | 102 | |
b87b0c0f DES |
103 | return IIO_VAL_FRACTIONAL_LOG2; |
104 | case IIO_CHAN_INFO_RAW: | |
105 | *val = data->raw[chan->channel]; | |
acf2f67d | 106 | |
b87b0c0f DES |
107 | return IIO_VAL_INT; |
108 | case IIO_CHAN_INFO_OFFSET: | |
109 | *val = 1; | |
acf2f67d | 110 | |
b87b0c0f DES |
111 | return IIO_VAL_INT; |
112 | default: | |
113 | break; | |
114 | } | |
acf2f67d | 115 | |
b87b0c0f DES |
116 | return -EINVAL; |
117 | } | |
118 | ||
119 | static int m62332_write_raw(struct iio_dev *indio_dev, | |
acf2f67d HK |
120 | struct iio_chan_spec const *chan, int val, int val2, |
121 | long mask) | |
b87b0c0f | 122 | { |
b87b0c0f DES |
123 | switch (mask) { |
124 | case IIO_CHAN_INFO_RAW: | |
125 | if (val < 0 || val > 255) | |
126 | return -EINVAL; | |
127 | ||
11687d4a | 128 | return m62332_set_value(indio_dev, val, chan->channel); |
b87b0c0f | 129 | default: |
b87b0c0f DES |
130 | break; |
131 | } | |
132 | ||
11687d4a | 133 | return -EINVAL; |
b87b0c0f DES |
134 | } |
135 | ||
136 | #ifdef CONFIG_PM_SLEEP | |
137 | static int m62332_suspend(struct device *dev) | |
138 | { | |
139 | struct i2c_client *client = to_i2c_client(dev); | |
140 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
141 | struct m62332_data *data = iio_priv(indio_dev); | |
142 | int ret; | |
143 | ||
144 | data->save[0] = data->raw[0]; | |
145 | data->save[1] = data->raw[1]; | |
146 | ||
147 | ret = m62332_set_value(indio_dev, 0, 0); | |
148 | if (ret < 0) | |
149 | return ret; | |
150 | ||
151 | return m62332_set_value(indio_dev, 0, 1); | |
152 | } | |
153 | ||
154 | static int m62332_resume(struct device *dev) | |
155 | { | |
156 | struct i2c_client *client = to_i2c_client(dev); | |
157 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
158 | struct m62332_data *data = iio_priv(indio_dev); | |
159 | int ret; | |
160 | ||
161 | ret = m62332_set_value(indio_dev, data->save[0], 0); | |
162 | if (ret < 0) | |
163 | return ret; | |
164 | ||
165 | return m62332_set_value(indio_dev, data->save[1], 1); | |
166 | } | |
167 | ||
168 | static SIMPLE_DEV_PM_OPS(m62332_pm_ops, m62332_suspend, m62332_resume); | |
169 | #define M62332_PM_OPS (&m62332_pm_ops) | |
170 | #else | |
171 | #define M62332_PM_OPS NULL | |
172 | #endif | |
173 | ||
174 | static const struct iio_info m62332_info = { | |
175 | .read_raw = m62332_read_raw, | |
176 | .write_raw = m62332_write_raw, | |
177 | .driver_module = THIS_MODULE, | |
178 | }; | |
179 | ||
862a76ac HK |
180 | #define M62332_CHANNEL(chan) { \ |
181 | .type = IIO_VOLTAGE, \ | |
182 | .indexed = 1, \ | |
183 | .output = 1, \ | |
184 | .channel = (chan), \ | |
185 | .datasheet_name = "CH" #chan, \ | |
186 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | |
187 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ | |
188 | BIT(IIO_CHAN_INFO_OFFSET), \ | |
b87b0c0f DES |
189 | } |
190 | ||
191 | static const struct iio_chan_spec m62332_channels[M62332_CHANNELS] = { | |
192 | M62332_CHANNEL(0), | |
193 | M62332_CHANNEL(1) | |
194 | }; | |
195 | ||
196 | static int m62332_probe(struct i2c_client *client, | |
197 | const struct i2c_device_id *id) | |
198 | { | |
199 | struct m62332_data *data; | |
200 | struct iio_dev *indio_dev; | |
201 | int ret; | |
202 | ||
203 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
204 | if (!indio_dev) | |
205 | return -ENOMEM; | |
acf2f67d | 206 | |
b87b0c0f DES |
207 | data = iio_priv(indio_dev); |
208 | i2c_set_clientdata(client, indio_dev); | |
209 | data->client = client; | |
210 | ||
211 | mutex_init(&data->mutex); | |
212 | ||
213 | data->vcc = devm_regulator_get(&client->dev, "VCC"); | |
214 | if (IS_ERR(data->vcc)) | |
215 | return PTR_ERR(data->vcc); | |
216 | ||
217 | /* establish that the iio_dev is a child of the i2c device */ | |
218 | indio_dev->dev.parent = &client->dev; | |
219 | ||
7d2da8ea | 220 | indio_dev->num_channels = ARRAY_SIZE(m62332_channels); |
b87b0c0f DES |
221 | indio_dev->channels = m62332_channels; |
222 | indio_dev->modes = INDIO_DIRECT_MODE; | |
223 | indio_dev->info = &m62332_info; | |
224 | ||
b87b0c0f DES |
225 | ret = iio_map_array_register(indio_dev, client->dev.platform_data); |
226 | if (ret < 0) | |
227 | return ret; | |
228 | ||
229 | ret = iio_device_register(indio_dev); | |
230 | if (ret < 0) | |
231 | goto err; | |
232 | ||
233 | return 0; | |
234 | ||
235 | err: | |
236 | iio_map_array_unregister(indio_dev); | |
acf2f67d | 237 | |
b87b0c0f DES |
238 | return ret; |
239 | } | |
240 | ||
241 | static int m62332_remove(struct i2c_client *client) | |
242 | { | |
243 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
244 | ||
245 | iio_device_unregister(indio_dev); | |
246 | iio_map_array_unregister(indio_dev); | |
847e3928 HK |
247 | m62332_set_value(indio_dev, 0, 0); |
248 | m62332_set_value(indio_dev, 0, 1); | |
b87b0c0f DES |
249 | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static const struct i2c_device_id m62332_id[] = { | |
254 | { "m62332", }, | |
255 | { } | |
256 | }; | |
257 | MODULE_DEVICE_TABLE(i2c, m62332_id); | |
258 | ||
259 | static struct i2c_driver m62332_driver = { | |
260 | .driver = { | |
261 | .name = "m62332", | |
262 | .pm = M62332_PM_OPS, | |
263 | }, | |
264 | .probe = m62332_probe, | |
265 | .remove = m62332_remove, | |
266 | .id_table = m62332_id, | |
267 | }; | |
268 | module_i2c_driver(m62332_driver); | |
269 | ||
270 | MODULE_AUTHOR("Dmitry Eremin-Solenikov"); | |
271 | MODULE_DESCRIPTION("M62332 8-bit DAC"); | |
272 | MODULE_LICENSE("GPL v2"); |