Bluetooth: hci_uart: Use generic functionality from Broadcom module
[linux/fpc-iii.git] / drivers / iio / dac / max517.c
blob9a82a7255ebb8d4420e22444f02a4e82a28bd0bb
1 /*
2 * max517.c - Support for Maxim MAX517, MAX518 and MAX519
4 * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/jiffies.h>
24 #include <linux/i2c.h>
25 #include <linux/err.h>
27 #include <linux/iio/iio.h>
28 #include <linux/iio/sysfs.h>
29 #include <linux/iio/dac/max517.h>
31 #define MAX517_DRV_NAME "max517"
33 /* Commands */
34 #define COMMAND_CHANNEL0 0x00
35 #define COMMAND_CHANNEL1 0x01 /* for MAX518 and MAX519 */
36 #define COMMAND_PD 0x08 /* Power Down */
38 enum max517_device_ids {
39 ID_MAX517,
40 ID_MAX518,
41 ID_MAX519,
44 struct max517_data {
45 struct i2c_client *client;
46 unsigned short vref_mv[2];
50 * channel: bit 0: channel 1
51 * bit 1: channel 2
52 * (this way, it's possible to set both channels at once)
54 static int max517_set_value(struct iio_dev *indio_dev,
55 long val, int channel)
57 struct max517_data *data = iio_priv(indio_dev);
58 struct i2c_client *client = data->client;
59 u8 outbuf[2];
60 int res;
62 if (val < 0 || val > 255)
63 return -EINVAL;
65 outbuf[0] = channel;
66 outbuf[1] = val;
68 res = i2c_master_send(client, outbuf, 2);
69 if (res < 0)
70 return res;
71 else if (res != 2)
72 return -EIO;
73 else
74 return 0;
77 static int max517_read_raw(struct iio_dev *indio_dev,
78 struct iio_chan_spec const *chan,
79 int *val,
80 int *val2,
81 long m)
83 struct max517_data *data = iio_priv(indio_dev);
85 switch (m) {
86 case IIO_CHAN_INFO_SCALE:
87 /* Corresponds to Vref / 2^(bits) */
88 *val = data->vref_mv[chan->channel];
89 *val2 = 8;
90 return IIO_VAL_FRACTIONAL_LOG2;
91 default:
92 break;
94 return -EINVAL;
97 static int max517_write_raw(struct iio_dev *indio_dev,
98 struct iio_chan_spec const *chan, int val, int val2, long mask)
100 int ret;
102 switch (mask) {
103 case IIO_CHAN_INFO_RAW:
104 ret = max517_set_value(indio_dev, val, chan->channel);
105 break;
106 default:
107 ret = -EINVAL;
108 break;
111 return ret;
114 #ifdef CONFIG_PM_SLEEP
115 static int max517_suspend(struct device *dev)
117 u8 outbuf = COMMAND_PD;
119 return i2c_master_send(to_i2c_client(dev), &outbuf, 1);
122 static int max517_resume(struct device *dev)
124 u8 outbuf = 0;
126 return i2c_master_send(to_i2c_client(dev), &outbuf, 1);
129 static SIMPLE_DEV_PM_OPS(max517_pm_ops, max517_suspend, max517_resume);
130 #define MAX517_PM_OPS (&max517_pm_ops)
131 #else
132 #define MAX517_PM_OPS NULL
133 #endif
135 static const struct iio_info max517_info = {
136 .read_raw = max517_read_raw,
137 .write_raw = max517_write_raw,
138 .driver_module = THIS_MODULE,
141 #define MAX517_CHANNEL(chan) { \
142 .type = IIO_VOLTAGE, \
143 .indexed = 1, \
144 .output = 1, \
145 .channel = (chan), \
146 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
147 BIT(IIO_CHAN_INFO_SCALE), \
150 static const struct iio_chan_spec max517_channels[] = {
151 MAX517_CHANNEL(0),
152 MAX517_CHANNEL(1)
155 static int max517_probe(struct i2c_client *client,
156 const struct i2c_device_id *id)
158 struct max517_data *data;
159 struct iio_dev *indio_dev;
160 struct max517_platform_data *platform_data = client->dev.platform_data;
162 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
163 if (!indio_dev)
164 return -ENOMEM;
165 data = iio_priv(indio_dev);
166 i2c_set_clientdata(client, indio_dev);
167 data->client = client;
169 /* establish that the iio_dev is a child of the i2c device */
170 indio_dev->dev.parent = &client->dev;
172 /* reduced channel set for MAX517 */
173 if (id->driver_data == ID_MAX517)
174 indio_dev->num_channels = 1;
175 else
176 indio_dev->num_channels = 2;
177 indio_dev->channels = max517_channels;
178 indio_dev->modes = INDIO_DIRECT_MODE;
179 indio_dev->info = &max517_info;
182 * Reference voltage on MAX518 and default is 5V, else take vref_mv
183 * from platform_data
185 if (id->driver_data == ID_MAX518 || !platform_data) {
186 data->vref_mv[0] = data->vref_mv[1] = 5000; /* mV */
187 } else {
188 data->vref_mv[0] = platform_data->vref_mv[0];
189 data->vref_mv[1] = platform_data->vref_mv[1];
192 return iio_device_register(indio_dev);
195 static int max517_remove(struct i2c_client *client)
197 iio_device_unregister(i2c_get_clientdata(client));
198 return 0;
201 static const struct i2c_device_id max517_id[] = {
202 { "max517", ID_MAX517 },
203 { "max518", ID_MAX518 },
204 { "max519", ID_MAX519 },
207 MODULE_DEVICE_TABLE(i2c, max517_id);
209 static struct i2c_driver max517_driver = {
210 .driver = {
211 .name = MAX517_DRV_NAME,
212 .pm = MAX517_PM_OPS,
214 .probe = max517_probe,
215 .remove = max517_remove,
216 .id_table = max517_id,
218 module_i2c_driver(max517_driver);
220 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
221 MODULE_DESCRIPTION("MAX517/MAX518/MAX519 8-bit DAC");
222 MODULE_LICENSE("GPL");