1b87b0c0fSDmitry Eremin-Solenikov /* 2b87b0c0fSDmitry Eremin-Solenikov * m62332.c - Support for Mitsubishi m62332 DAC 3b87b0c0fSDmitry Eremin-Solenikov * 4b87b0c0fSDmitry Eremin-Solenikov * Copyright (c) 2014 Dmitry Eremin-Solenikov 5b87b0c0fSDmitry Eremin-Solenikov * 6b87b0c0fSDmitry Eremin-Solenikov * Based on max517 driver: 7b87b0c0fSDmitry Eremin-Solenikov * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> 8b87b0c0fSDmitry Eremin-Solenikov * 9b87b0c0fSDmitry Eremin-Solenikov * This program is free software; you can redistribute it and/or modify 10b87b0c0fSDmitry Eremin-Solenikov * it under the terms of the GNU General Public License as published by 11b87b0c0fSDmitry Eremin-Solenikov * the Free Software Foundation; either version 2 of the License, or 12b87b0c0fSDmitry Eremin-Solenikov * (at your option) any later version. 13b87b0c0fSDmitry Eremin-Solenikov * 14b87b0c0fSDmitry Eremin-Solenikov * This program is distributed in the hope that it will be useful, 15b87b0c0fSDmitry Eremin-Solenikov * but WITHOUT ANY WARRANTY; without even the implied warranty of 16b87b0c0fSDmitry Eremin-Solenikov * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17b87b0c0fSDmitry Eremin-Solenikov * GNU General Public License for more details. 18b87b0c0fSDmitry Eremin-Solenikov */ 19b87b0c0fSDmitry Eremin-Solenikov 20b87b0c0fSDmitry Eremin-Solenikov #include <linux/module.h> 21b87b0c0fSDmitry Eremin-Solenikov #include <linux/slab.h> 22b87b0c0fSDmitry Eremin-Solenikov #include <linux/i2c.h> 23b87b0c0fSDmitry Eremin-Solenikov #include <linux/err.h> 24b87b0c0fSDmitry Eremin-Solenikov 25b87b0c0fSDmitry Eremin-Solenikov #include <linux/iio/iio.h> 26b87b0c0fSDmitry Eremin-Solenikov #include <linux/iio/driver.h> 27b87b0c0fSDmitry Eremin-Solenikov 28b87b0c0fSDmitry Eremin-Solenikov #include <linux/regulator/consumer.h> 29b87b0c0fSDmitry Eremin-Solenikov 30b87b0c0fSDmitry Eremin-Solenikov #define M62332_CHANNELS 2 31b87b0c0fSDmitry Eremin-Solenikov 32b87b0c0fSDmitry Eremin-Solenikov struct m62332_data { 33b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client; 34b87b0c0fSDmitry Eremin-Solenikov struct regulator *vcc; 35b87b0c0fSDmitry Eremin-Solenikov struct mutex mutex; 36b87b0c0fSDmitry Eremin-Solenikov u8 raw[M62332_CHANNELS]; 37b87b0c0fSDmitry Eremin-Solenikov #ifdef CONFIG_PM_SLEEP 38b87b0c0fSDmitry Eremin-Solenikov u8 save[M62332_CHANNELS]; 39b87b0c0fSDmitry Eremin-Solenikov #endif 40b87b0c0fSDmitry Eremin-Solenikov }; 41b87b0c0fSDmitry Eremin-Solenikov 42acf2f67dSHartmut Knaack static int m62332_set_value(struct iio_dev *indio_dev, u8 val, int channel) 43b87b0c0fSDmitry Eremin-Solenikov { 44b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev); 45b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = data->client; 46b87b0c0fSDmitry Eremin-Solenikov u8 outbuf[2]; 47b87b0c0fSDmitry Eremin-Solenikov int res; 48b87b0c0fSDmitry Eremin-Solenikov 49b87b0c0fSDmitry Eremin-Solenikov if (val == data->raw[channel]) 50b87b0c0fSDmitry Eremin-Solenikov return 0; 51b87b0c0fSDmitry Eremin-Solenikov 52b87b0c0fSDmitry Eremin-Solenikov outbuf[0] = channel; 53b87b0c0fSDmitry Eremin-Solenikov outbuf[1] = val; 54b87b0c0fSDmitry Eremin-Solenikov 55b87b0c0fSDmitry Eremin-Solenikov mutex_lock(&data->mutex); 56b87b0c0fSDmitry Eremin-Solenikov 57b87b0c0fSDmitry Eremin-Solenikov if (val) { 58b87b0c0fSDmitry Eremin-Solenikov res = regulator_enable(data->vcc); 59b87b0c0fSDmitry Eremin-Solenikov if (res) 60b87b0c0fSDmitry Eremin-Solenikov goto out; 61b87b0c0fSDmitry Eremin-Solenikov } 62b87b0c0fSDmitry Eremin-Solenikov 637d2da8eaSHartmut Knaack res = i2c_master_send(client, outbuf, ARRAY_SIZE(outbuf)); 647d2da8eaSHartmut Knaack if (res >= 0 && res != ARRAY_SIZE(outbuf)) 65b87b0c0fSDmitry Eremin-Solenikov res = -EIO; 66b87b0c0fSDmitry Eremin-Solenikov if (res < 0) 67b87b0c0fSDmitry Eremin-Solenikov goto out; 68b87b0c0fSDmitry Eremin-Solenikov 69b87b0c0fSDmitry Eremin-Solenikov data->raw[channel] = val; 70b87b0c0fSDmitry Eremin-Solenikov 71b87b0c0fSDmitry Eremin-Solenikov if (!val) 72b87b0c0fSDmitry Eremin-Solenikov regulator_disable(data->vcc); 73b87b0c0fSDmitry Eremin-Solenikov 74b87b0c0fSDmitry Eremin-Solenikov mutex_unlock(&data->mutex); 75b87b0c0fSDmitry Eremin-Solenikov 76b87b0c0fSDmitry Eremin-Solenikov return 0; 77b87b0c0fSDmitry Eremin-Solenikov 78b87b0c0fSDmitry Eremin-Solenikov out: 79b87b0c0fSDmitry Eremin-Solenikov mutex_unlock(&data->mutex); 80b87b0c0fSDmitry Eremin-Solenikov 81b87b0c0fSDmitry Eremin-Solenikov return res; 82b87b0c0fSDmitry Eremin-Solenikov } 83b87b0c0fSDmitry Eremin-Solenikov 84b87b0c0fSDmitry Eremin-Solenikov static int m62332_read_raw(struct iio_dev *indio_dev, 85b87b0c0fSDmitry Eremin-Solenikov struct iio_chan_spec const *chan, 86b87b0c0fSDmitry Eremin-Solenikov int *val, 87b87b0c0fSDmitry Eremin-Solenikov int *val2, 88acf2f67dSHartmut Knaack long mask) 89b87b0c0fSDmitry Eremin-Solenikov { 90b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev); 9139991053SHartmut Knaack int ret; 92b87b0c0fSDmitry Eremin-Solenikov 93acf2f67dSHartmut Knaack switch (mask) { 94b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_SCALE: 95b87b0c0fSDmitry Eremin-Solenikov /* Corresponds to Vref / 2^(bits) */ 9639991053SHartmut Knaack ret = regulator_get_voltage(data->vcc); 9739991053SHartmut Knaack if (ret < 0) 9839991053SHartmut Knaack return ret; 9939991053SHartmut Knaack 10039991053SHartmut Knaack *val = ret / 1000; /* mV */ 101b87b0c0fSDmitry Eremin-Solenikov *val2 = 8; 102acf2f67dSHartmut Knaack 103b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_FRACTIONAL_LOG2; 104b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_RAW: 105b87b0c0fSDmitry Eremin-Solenikov *val = data->raw[chan->channel]; 106acf2f67dSHartmut Knaack 107b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_INT; 108b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_OFFSET: 109b87b0c0fSDmitry Eremin-Solenikov *val = 1; 110acf2f67dSHartmut Knaack 111b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_INT; 112b87b0c0fSDmitry Eremin-Solenikov default: 113b87b0c0fSDmitry Eremin-Solenikov break; 114b87b0c0fSDmitry Eremin-Solenikov } 115acf2f67dSHartmut Knaack 116b87b0c0fSDmitry Eremin-Solenikov return -EINVAL; 117b87b0c0fSDmitry Eremin-Solenikov } 118b87b0c0fSDmitry Eremin-Solenikov 119b87b0c0fSDmitry Eremin-Solenikov static int m62332_write_raw(struct iio_dev *indio_dev, 120acf2f67dSHartmut Knaack struct iio_chan_spec const *chan, int val, int val2, 121acf2f67dSHartmut Knaack long mask) 122b87b0c0fSDmitry Eremin-Solenikov { 123b87b0c0fSDmitry Eremin-Solenikov switch (mask) { 124b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_RAW: 125b87b0c0fSDmitry Eremin-Solenikov if (val < 0 || val > 255) 126b87b0c0fSDmitry Eremin-Solenikov return -EINVAL; 127b87b0c0fSDmitry Eremin-Solenikov 12811687d4aSHartmut Knaack return m62332_set_value(indio_dev, val, chan->channel); 129b87b0c0fSDmitry Eremin-Solenikov default: 130b87b0c0fSDmitry Eremin-Solenikov break; 131b87b0c0fSDmitry Eremin-Solenikov } 132b87b0c0fSDmitry Eremin-Solenikov 13311687d4aSHartmut Knaack return -EINVAL; 134b87b0c0fSDmitry Eremin-Solenikov } 135b87b0c0fSDmitry Eremin-Solenikov 136b87b0c0fSDmitry Eremin-Solenikov #ifdef CONFIG_PM_SLEEP 137b87b0c0fSDmitry Eremin-Solenikov static int m62332_suspend(struct device *dev) 138b87b0c0fSDmitry Eremin-Solenikov { 139b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = to_i2c_client(dev); 140b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client); 141b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev); 142b87b0c0fSDmitry Eremin-Solenikov int ret; 143b87b0c0fSDmitry Eremin-Solenikov 144b87b0c0fSDmitry Eremin-Solenikov data->save[0] = data->raw[0]; 145b87b0c0fSDmitry Eremin-Solenikov data->save[1] = data->raw[1]; 146b87b0c0fSDmitry Eremin-Solenikov 147b87b0c0fSDmitry Eremin-Solenikov ret = m62332_set_value(indio_dev, 0, 0); 148b87b0c0fSDmitry Eremin-Solenikov if (ret < 0) 149b87b0c0fSDmitry Eremin-Solenikov return ret; 150b87b0c0fSDmitry Eremin-Solenikov 151b87b0c0fSDmitry Eremin-Solenikov return m62332_set_value(indio_dev, 0, 1); 152b87b0c0fSDmitry Eremin-Solenikov } 153b87b0c0fSDmitry Eremin-Solenikov 154b87b0c0fSDmitry Eremin-Solenikov static int m62332_resume(struct device *dev) 155b87b0c0fSDmitry Eremin-Solenikov { 156b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = to_i2c_client(dev); 157b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client); 158b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev); 159b87b0c0fSDmitry Eremin-Solenikov int ret; 160b87b0c0fSDmitry Eremin-Solenikov 161b87b0c0fSDmitry Eremin-Solenikov ret = m62332_set_value(indio_dev, data->save[0], 0); 162b87b0c0fSDmitry Eremin-Solenikov if (ret < 0) 163b87b0c0fSDmitry Eremin-Solenikov return ret; 164b87b0c0fSDmitry Eremin-Solenikov 165b87b0c0fSDmitry Eremin-Solenikov return m62332_set_value(indio_dev, data->save[1], 1); 166b87b0c0fSDmitry Eremin-Solenikov } 167b87b0c0fSDmitry Eremin-Solenikov 168b87b0c0fSDmitry Eremin-Solenikov static SIMPLE_DEV_PM_OPS(m62332_pm_ops, m62332_suspend, m62332_resume); 169b87b0c0fSDmitry Eremin-Solenikov #define M62332_PM_OPS (&m62332_pm_ops) 170b87b0c0fSDmitry Eremin-Solenikov #else 171b87b0c0fSDmitry Eremin-Solenikov #define M62332_PM_OPS NULL 172b87b0c0fSDmitry Eremin-Solenikov #endif 173b87b0c0fSDmitry Eremin-Solenikov 174b87b0c0fSDmitry Eremin-Solenikov static const struct iio_info m62332_info = { 175b87b0c0fSDmitry Eremin-Solenikov .read_raw = m62332_read_raw, 176b87b0c0fSDmitry Eremin-Solenikov .write_raw = m62332_write_raw, 177b87b0c0fSDmitry Eremin-Solenikov .driver_module = THIS_MODULE, 178b87b0c0fSDmitry Eremin-Solenikov }; 179b87b0c0fSDmitry Eremin-Solenikov 180b87b0c0fSDmitry Eremin-Solenikov #define M62332_CHANNEL(chan) { \ 181b87b0c0fSDmitry Eremin-Solenikov .type = IIO_VOLTAGE, \ 182b87b0c0fSDmitry Eremin-Solenikov .indexed = 1, \ 183b87b0c0fSDmitry Eremin-Solenikov .output = 1, \ 184b87b0c0fSDmitry Eremin-Solenikov .channel = (chan), \ 185b87b0c0fSDmitry Eremin-Solenikov .datasheet_name = "CH" #chan, \ 186862a76acSHartmut Knaack .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 187862a76acSHartmut Knaack .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ 188b87b0c0fSDmitry Eremin-Solenikov BIT(IIO_CHAN_INFO_OFFSET), \ 189b87b0c0fSDmitry Eremin-Solenikov } 190b87b0c0fSDmitry Eremin-Solenikov 191b87b0c0fSDmitry Eremin-Solenikov static const struct iio_chan_spec m62332_channels[M62332_CHANNELS] = { 192b87b0c0fSDmitry Eremin-Solenikov M62332_CHANNEL(0), 193b87b0c0fSDmitry Eremin-Solenikov M62332_CHANNEL(1) 194b87b0c0fSDmitry Eremin-Solenikov }; 195b87b0c0fSDmitry Eremin-Solenikov 196b87b0c0fSDmitry Eremin-Solenikov static int m62332_probe(struct i2c_client *client, 197b87b0c0fSDmitry Eremin-Solenikov const struct i2c_device_id *id) 198b87b0c0fSDmitry Eremin-Solenikov { 199b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data; 200b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev; 201b87b0c0fSDmitry Eremin-Solenikov int ret; 202b87b0c0fSDmitry Eremin-Solenikov 203b87b0c0fSDmitry Eremin-Solenikov indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 204b87b0c0fSDmitry Eremin-Solenikov if (!indio_dev) 205b87b0c0fSDmitry Eremin-Solenikov return -ENOMEM; 206acf2f67dSHartmut Knaack 207b87b0c0fSDmitry Eremin-Solenikov data = iio_priv(indio_dev); 208b87b0c0fSDmitry Eremin-Solenikov i2c_set_clientdata(client, indio_dev); 209b87b0c0fSDmitry Eremin-Solenikov data->client = client; 210b87b0c0fSDmitry Eremin-Solenikov 211b87b0c0fSDmitry Eremin-Solenikov mutex_init(&data->mutex); 212b87b0c0fSDmitry Eremin-Solenikov 213b87b0c0fSDmitry Eremin-Solenikov data->vcc = devm_regulator_get(&client->dev, "VCC"); 214b87b0c0fSDmitry Eremin-Solenikov if (IS_ERR(data->vcc)) 215b87b0c0fSDmitry Eremin-Solenikov return PTR_ERR(data->vcc); 216b87b0c0fSDmitry Eremin-Solenikov 217b87b0c0fSDmitry Eremin-Solenikov /* establish that the iio_dev is a child of the i2c device */ 218b87b0c0fSDmitry Eremin-Solenikov indio_dev->dev.parent = &client->dev; 219b87b0c0fSDmitry Eremin-Solenikov 2207d2da8eaSHartmut Knaack indio_dev->num_channels = ARRAY_SIZE(m62332_channels); 221b87b0c0fSDmitry Eremin-Solenikov indio_dev->channels = m62332_channels; 222b87b0c0fSDmitry Eremin-Solenikov indio_dev->modes = INDIO_DIRECT_MODE; 223b87b0c0fSDmitry Eremin-Solenikov indio_dev->info = &m62332_info; 224b87b0c0fSDmitry Eremin-Solenikov 225b87b0c0fSDmitry Eremin-Solenikov ret = iio_map_array_register(indio_dev, client->dev.platform_data); 226b87b0c0fSDmitry Eremin-Solenikov if (ret < 0) 227b87b0c0fSDmitry Eremin-Solenikov return ret; 228b87b0c0fSDmitry Eremin-Solenikov 229b87b0c0fSDmitry Eremin-Solenikov ret = iio_device_register(indio_dev); 230b87b0c0fSDmitry Eremin-Solenikov if (ret < 0) 231b87b0c0fSDmitry Eremin-Solenikov goto err; 232b87b0c0fSDmitry Eremin-Solenikov 233b87b0c0fSDmitry Eremin-Solenikov return 0; 234b87b0c0fSDmitry Eremin-Solenikov 235b87b0c0fSDmitry Eremin-Solenikov err: 236b87b0c0fSDmitry Eremin-Solenikov iio_map_array_unregister(indio_dev); 237acf2f67dSHartmut Knaack 238b87b0c0fSDmitry Eremin-Solenikov return ret; 239b87b0c0fSDmitry Eremin-Solenikov } 240b87b0c0fSDmitry Eremin-Solenikov 241b87b0c0fSDmitry Eremin-Solenikov static int m62332_remove(struct i2c_client *client) 242b87b0c0fSDmitry Eremin-Solenikov { 243b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client); 244b87b0c0fSDmitry Eremin-Solenikov 245b87b0c0fSDmitry Eremin-Solenikov iio_device_unregister(indio_dev); 246b87b0c0fSDmitry Eremin-Solenikov iio_map_array_unregister(indio_dev); 247847e3928SHartmut Knaack m62332_set_value(indio_dev, 0, 0); 248847e3928SHartmut Knaack m62332_set_value(indio_dev, 0, 1); 249b87b0c0fSDmitry Eremin-Solenikov 250b87b0c0fSDmitry Eremin-Solenikov return 0; 251b87b0c0fSDmitry Eremin-Solenikov } 252b87b0c0fSDmitry Eremin-Solenikov 253b87b0c0fSDmitry Eremin-Solenikov static const struct i2c_device_id m62332_id[] = { 254b87b0c0fSDmitry Eremin-Solenikov { "m62332", }, 255b87b0c0fSDmitry Eremin-Solenikov { } 256b87b0c0fSDmitry Eremin-Solenikov }; 257b87b0c0fSDmitry Eremin-Solenikov MODULE_DEVICE_TABLE(i2c, m62332_id); 258b87b0c0fSDmitry Eremin-Solenikov 259b87b0c0fSDmitry Eremin-Solenikov static struct i2c_driver m62332_driver = { 260b87b0c0fSDmitry Eremin-Solenikov .driver = { 261b87b0c0fSDmitry Eremin-Solenikov .name = "m62332", 262b87b0c0fSDmitry Eremin-Solenikov .pm = M62332_PM_OPS, 263b87b0c0fSDmitry Eremin-Solenikov }, 264b87b0c0fSDmitry Eremin-Solenikov .probe = m62332_probe, 265b87b0c0fSDmitry Eremin-Solenikov .remove = m62332_remove, 266b87b0c0fSDmitry Eremin-Solenikov .id_table = m62332_id, 267b87b0c0fSDmitry Eremin-Solenikov }; 268b87b0c0fSDmitry Eremin-Solenikov module_i2c_driver(m62332_driver); 269b87b0c0fSDmitry Eremin-Solenikov 270b87b0c0fSDmitry Eremin-Solenikov MODULE_AUTHOR("Dmitry Eremin-Solenikov"); 271b87b0c0fSDmitry Eremin-Solenikov MODULE_DESCRIPTION("M62332 8-bit DAC"); 272b87b0c0fSDmitry Eremin-Solenikov MODULE_LICENSE("GPL v2"); 273