1c942fddfSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2b87b0c0fSDmitry Eremin-Solenikov /* 3b87b0c0fSDmitry Eremin-Solenikov * m62332.c - Support for Mitsubishi m62332 DAC 4b87b0c0fSDmitry Eremin-Solenikov * 5b87b0c0fSDmitry Eremin-Solenikov * Copyright (c) 2014 Dmitry Eremin-Solenikov 6b87b0c0fSDmitry Eremin-Solenikov * 7b87b0c0fSDmitry Eremin-Solenikov * Based on max517 driver: 8b87b0c0fSDmitry Eremin-Solenikov * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de> 9b87b0c0fSDmitry Eremin-Solenikov */ 10b87b0c0fSDmitry Eremin-Solenikov 11b87b0c0fSDmitry Eremin-Solenikov #include <linux/module.h> 12b87b0c0fSDmitry Eremin-Solenikov #include <linux/slab.h> 13b87b0c0fSDmitry Eremin-Solenikov #include <linux/i2c.h> 14b87b0c0fSDmitry Eremin-Solenikov #include <linux/err.h> 15b87b0c0fSDmitry Eremin-Solenikov 16b87b0c0fSDmitry Eremin-Solenikov #include <linux/iio/iio.h> 17b87b0c0fSDmitry Eremin-Solenikov #include <linux/iio/driver.h> 18b87b0c0fSDmitry Eremin-Solenikov 19b87b0c0fSDmitry Eremin-Solenikov #include <linux/regulator/consumer.h> 20b87b0c0fSDmitry Eremin-Solenikov 21b87b0c0fSDmitry Eremin-Solenikov #define M62332_CHANNELS 2 22b87b0c0fSDmitry Eremin-Solenikov 23b87b0c0fSDmitry Eremin-Solenikov struct m62332_data { 24b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client; 25b87b0c0fSDmitry Eremin-Solenikov struct regulator *vcc; 26b87b0c0fSDmitry Eremin-Solenikov struct mutex mutex; 27b87b0c0fSDmitry Eremin-Solenikov u8 raw[M62332_CHANNELS]; 28b87b0c0fSDmitry Eremin-Solenikov #ifdef CONFIG_PM_SLEEP 29b87b0c0fSDmitry Eremin-Solenikov u8 save[M62332_CHANNELS]; 30b87b0c0fSDmitry Eremin-Solenikov #endif 31b87b0c0fSDmitry Eremin-Solenikov }; 32b87b0c0fSDmitry Eremin-Solenikov 33acf2f67dSHartmut Knaack static int m62332_set_value(struct iio_dev *indio_dev, u8 val, int channel) 34b87b0c0fSDmitry Eremin-Solenikov { 35b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev); 36b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = data->client; 37b87b0c0fSDmitry Eremin-Solenikov u8 outbuf[2]; 38b87b0c0fSDmitry Eremin-Solenikov int res; 39b87b0c0fSDmitry Eremin-Solenikov 40b87b0c0fSDmitry Eremin-Solenikov if (val == data->raw[channel]) 41b87b0c0fSDmitry Eremin-Solenikov return 0; 42b87b0c0fSDmitry Eremin-Solenikov 43b87b0c0fSDmitry Eremin-Solenikov outbuf[0] = channel; 44b87b0c0fSDmitry Eremin-Solenikov outbuf[1] = val; 45b87b0c0fSDmitry Eremin-Solenikov 46b87b0c0fSDmitry Eremin-Solenikov mutex_lock(&data->mutex); 47b87b0c0fSDmitry Eremin-Solenikov 48b87b0c0fSDmitry Eremin-Solenikov if (val) { 49b87b0c0fSDmitry Eremin-Solenikov res = regulator_enable(data->vcc); 50b87b0c0fSDmitry Eremin-Solenikov if (res) 51b87b0c0fSDmitry Eremin-Solenikov goto out; 52b87b0c0fSDmitry Eremin-Solenikov } 53b87b0c0fSDmitry Eremin-Solenikov 547d2da8eaSHartmut Knaack res = i2c_master_send(client, outbuf, ARRAY_SIZE(outbuf)); 557d2da8eaSHartmut Knaack if (res >= 0 && res != ARRAY_SIZE(outbuf)) 56b87b0c0fSDmitry Eremin-Solenikov res = -EIO; 57b87b0c0fSDmitry Eremin-Solenikov if (res < 0) 58b87b0c0fSDmitry Eremin-Solenikov goto out; 59b87b0c0fSDmitry Eremin-Solenikov 60b87b0c0fSDmitry Eremin-Solenikov data->raw[channel] = val; 61b87b0c0fSDmitry Eremin-Solenikov 62b87b0c0fSDmitry Eremin-Solenikov if (!val) 63b87b0c0fSDmitry Eremin-Solenikov regulator_disable(data->vcc); 64b87b0c0fSDmitry Eremin-Solenikov 65b87b0c0fSDmitry Eremin-Solenikov mutex_unlock(&data->mutex); 66b87b0c0fSDmitry Eremin-Solenikov 67b87b0c0fSDmitry Eremin-Solenikov return 0; 68b87b0c0fSDmitry Eremin-Solenikov 69b87b0c0fSDmitry Eremin-Solenikov out: 70b87b0c0fSDmitry Eremin-Solenikov mutex_unlock(&data->mutex); 71b87b0c0fSDmitry Eremin-Solenikov 72b87b0c0fSDmitry Eremin-Solenikov return res; 73b87b0c0fSDmitry Eremin-Solenikov } 74b87b0c0fSDmitry Eremin-Solenikov 75b87b0c0fSDmitry Eremin-Solenikov static int m62332_read_raw(struct iio_dev *indio_dev, 76b87b0c0fSDmitry Eremin-Solenikov struct iio_chan_spec const *chan, 77b87b0c0fSDmitry Eremin-Solenikov int *val, 78b87b0c0fSDmitry Eremin-Solenikov int *val2, 79acf2f67dSHartmut Knaack long mask) 80b87b0c0fSDmitry Eremin-Solenikov { 81b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev); 8239991053SHartmut Knaack int ret; 83b87b0c0fSDmitry Eremin-Solenikov 84acf2f67dSHartmut Knaack switch (mask) { 85b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_SCALE: 86b87b0c0fSDmitry Eremin-Solenikov /* Corresponds to Vref / 2^(bits) */ 8739991053SHartmut Knaack ret = regulator_get_voltage(data->vcc); 8839991053SHartmut Knaack if (ret < 0) 8939991053SHartmut Knaack return ret; 9039991053SHartmut Knaack 9139991053SHartmut Knaack *val = ret / 1000; /* mV */ 92b87b0c0fSDmitry Eremin-Solenikov *val2 = 8; 93acf2f67dSHartmut Knaack 94b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_FRACTIONAL_LOG2; 95b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_RAW: 96b87b0c0fSDmitry Eremin-Solenikov *val = data->raw[chan->channel]; 97acf2f67dSHartmut Knaack 98b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_INT; 99b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_OFFSET: 100b87b0c0fSDmitry Eremin-Solenikov *val = 1; 101acf2f67dSHartmut Knaack 102b87b0c0fSDmitry Eremin-Solenikov return IIO_VAL_INT; 103b87b0c0fSDmitry Eremin-Solenikov default: 104b87b0c0fSDmitry Eremin-Solenikov break; 105b87b0c0fSDmitry Eremin-Solenikov } 106acf2f67dSHartmut Knaack 107b87b0c0fSDmitry Eremin-Solenikov return -EINVAL; 108b87b0c0fSDmitry Eremin-Solenikov } 109b87b0c0fSDmitry Eremin-Solenikov 110b87b0c0fSDmitry Eremin-Solenikov static int m62332_write_raw(struct iio_dev *indio_dev, 111acf2f67dSHartmut Knaack struct iio_chan_spec const *chan, int val, int val2, 112acf2f67dSHartmut Knaack long mask) 113b87b0c0fSDmitry Eremin-Solenikov { 114b87b0c0fSDmitry Eremin-Solenikov switch (mask) { 115b87b0c0fSDmitry Eremin-Solenikov case IIO_CHAN_INFO_RAW: 116b87b0c0fSDmitry Eremin-Solenikov if (val < 0 || val > 255) 117b87b0c0fSDmitry Eremin-Solenikov return -EINVAL; 118b87b0c0fSDmitry Eremin-Solenikov 11911687d4aSHartmut Knaack return m62332_set_value(indio_dev, val, chan->channel); 120b87b0c0fSDmitry Eremin-Solenikov default: 121b87b0c0fSDmitry Eremin-Solenikov break; 122b87b0c0fSDmitry Eremin-Solenikov } 123b87b0c0fSDmitry Eremin-Solenikov 12411687d4aSHartmut Knaack return -EINVAL; 125b87b0c0fSDmitry Eremin-Solenikov } 126b87b0c0fSDmitry Eremin-Solenikov 127b87b0c0fSDmitry Eremin-Solenikov #ifdef CONFIG_PM_SLEEP 128b87b0c0fSDmitry Eremin-Solenikov static int m62332_suspend(struct device *dev) 129b87b0c0fSDmitry Eremin-Solenikov { 130b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = to_i2c_client(dev); 131b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client); 132b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev); 133b87b0c0fSDmitry Eremin-Solenikov int ret; 134b87b0c0fSDmitry Eremin-Solenikov 135b87b0c0fSDmitry Eremin-Solenikov data->save[0] = data->raw[0]; 136b87b0c0fSDmitry Eremin-Solenikov data->save[1] = data->raw[1]; 137b87b0c0fSDmitry Eremin-Solenikov 138b87b0c0fSDmitry Eremin-Solenikov ret = m62332_set_value(indio_dev, 0, 0); 139b87b0c0fSDmitry Eremin-Solenikov if (ret < 0) 140b87b0c0fSDmitry Eremin-Solenikov return ret; 141b87b0c0fSDmitry Eremin-Solenikov 142b87b0c0fSDmitry Eremin-Solenikov return m62332_set_value(indio_dev, 0, 1); 143b87b0c0fSDmitry Eremin-Solenikov } 144b87b0c0fSDmitry Eremin-Solenikov 145b87b0c0fSDmitry Eremin-Solenikov static int m62332_resume(struct device *dev) 146b87b0c0fSDmitry Eremin-Solenikov { 147b87b0c0fSDmitry Eremin-Solenikov struct i2c_client *client = to_i2c_client(dev); 148b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client); 149b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data = iio_priv(indio_dev); 150b87b0c0fSDmitry Eremin-Solenikov int ret; 151b87b0c0fSDmitry Eremin-Solenikov 152b87b0c0fSDmitry Eremin-Solenikov ret = m62332_set_value(indio_dev, data->save[0], 0); 153b87b0c0fSDmitry Eremin-Solenikov if (ret < 0) 154b87b0c0fSDmitry Eremin-Solenikov return ret; 155b87b0c0fSDmitry Eremin-Solenikov 156b87b0c0fSDmitry Eremin-Solenikov return m62332_set_value(indio_dev, data->save[1], 1); 157b87b0c0fSDmitry Eremin-Solenikov } 158b87b0c0fSDmitry Eremin-Solenikov 159b87b0c0fSDmitry Eremin-Solenikov static SIMPLE_DEV_PM_OPS(m62332_pm_ops, m62332_suspend, m62332_resume); 160b87b0c0fSDmitry Eremin-Solenikov #define M62332_PM_OPS (&m62332_pm_ops) 161b87b0c0fSDmitry Eremin-Solenikov #else 162b87b0c0fSDmitry Eremin-Solenikov #define M62332_PM_OPS NULL 163b87b0c0fSDmitry Eremin-Solenikov #endif 164b87b0c0fSDmitry Eremin-Solenikov 165b87b0c0fSDmitry Eremin-Solenikov static const struct iio_info m62332_info = { 166b87b0c0fSDmitry Eremin-Solenikov .read_raw = m62332_read_raw, 167b87b0c0fSDmitry Eremin-Solenikov .write_raw = m62332_write_raw, 168b87b0c0fSDmitry Eremin-Solenikov }; 169b87b0c0fSDmitry Eremin-Solenikov 170b87b0c0fSDmitry Eremin-Solenikov #define M62332_CHANNEL(chan) { \ 171b87b0c0fSDmitry Eremin-Solenikov .type = IIO_VOLTAGE, \ 172b87b0c0fSDmitry Eremin-Solenikov .indexed = 1, \ 173b87b0c0fSDmitry Eremin-Solenikov .output = 1, \ 174b87b0c0fSDmitry Eremin-Solenikov .channel = (chan), \ 175b87b0c0fSDmitry Eremin-Solenikov .datasheet_name = "CH" #chan, \ 176862a76acSHartmut Knaack .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 177862a76acSHartmut Knaack .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ 178b87b0c0fSDmitry Eremin-Solenikov BIT(IIO_CHAN_INFO_OFFSET), \ 179b87b0c0fSDmitry Eremin-Solenikov } 180b87b0c0fSDmitry Eremin-Solenikov 181b87b0c0fSDmitry Eremin-Solenikov static const struct iio_chan_spec m62332_channels[M62332_CHANNELS] = { 182b87b0c0fSDmitry Eremin-Solenikov M62332_CHANNEL(0), 183b87b0c0fSDmitry Eremin-Solenikov M62332_CHANNEL(1) 184b87b0c0fSDmitry Eremin-Solenikov }; 185b87b0c0fSDmitry Eremin-Solenikov 186b87b0c0fSDmitry Eremin-Solenikov static int m62332_probe(struct i2c_client *client, 187b87b0c0fSDmitry Eremin-Solenikov const struct i2c_device_id *id) 188b87b0c0fSDmitry Eremin-Solenikov { 189b87b0c0fSDmitry Eremin-Solenikov struct m62332_data *data; 190b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev; 191b87b0c0fSDmitry Eremin-Solenikov int ret; 192b87b0c0fSDmitry Eremin-Solenikov 193b87b0c0fSDmitry Eremin-Solenikov indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 194b87b0c0fSDmitry Eremin-Solenikov if (!indio_dev) 195b87b0c0fSDmitry Eremin-Solenikov return -ENOMEM; 196acf2f67dSHartmut Knaack 197b87b0c0fSDmitry Eremin-Solenikov data = iio_priv(indio_dev); 198b87b0c0fSDmitry Eremin-Solenikov i2c_set_clientdata(client, indio_dev); 199b87b0c0fSDmitry Eremin-Solenikov data->client = client; 200b87b0c0fSDmitry Eremin-Solenikov 201b87b0c0fSDmitry Eremin-Solenikov mutex_init(&data->mutex); 202b87b0c0fSDmitry Eremin-Solenikov 203b87b0c0fSDmitry Eremin-Solenikov data->vcc = devm_regulator_get(&client->dev, "VCC"); 204b87b0c0fSDmitry Eremin-Solenikov if (IS_ERR(data->vcc)) 205b87b0c0fSDmitry Eremin-Solenikov return PTR_ERR(data->vcc); 206b87b0c0fSDmitry Eremin-Solenikov 207b87b0c0fSDmitry Eremin-Solenikov /* establish that the iio_dev is a child of the i2c device */ 208b87b0c0fSDmitry Eremin-Solenikov indio_dev->dev.parent = &client->dev; 209b87b0c0fSDmitry Eremin-Solenikov 2107d2da8eaSHartmut Knaack indio_dev->num_channels = ARRAY_SIZE(m62332_channels); 211b87b0c0fSDmitry Eremin-Solenikov indio_dev->channels = m62332_channels; 212b87b0c0fSDmitry Eremin-Solenikov indio_dev->modes = INDIO_DIRECT_MODE; 213b87b0c0fSDmitry Eremin-Solenikov indio_dev->info = &m62332_info; 214b87b0c0fSDmitry Eremin-Solenikov 215b87b0c0fSDmitry Eremin-Solenikov ret = iio_map_array_register(indio_dev, client->dev.platform_data); 216b87b0c0fSDmitry Eremin-Solenikov if (ret < 0) 217b87b0c0fSDmitry Eremin-Solenikov return ret; 218b87b0c0fSDmitry Eremin-Solenikov 219b87b0c0fSDmitry Eremin-Solenikov ret = iio_device_register(indio_dev); 220b87b0c0fSDmitry Eremin-Solenikov if (ret < 0) 221b87b0c0fSDmitry Eremin-Solenikov goto err; 222b87b0c0fSDmitry Eremin-Solenikov 223b87b0c0fSDmitry Eremin-Solenikov return 0; 224b87b0c0fSDmitry Eremin-Solenikov 225b87b0c0fSDmitry Eremin-Solenikov err: 226b87b0c0fSDmitry Eremin-Solenikov iio_map_array_unregister(indio_dev); 227acf2f67dSHartmut Knaack 228b87b0c0fSDmitry Eremin-Solenikov return ret; 229b87b0c0fSDmitry Eremin-Solenikov } 230b87b0c0fSDmitry Eremin-Solenikov 231b87b0c0fSDmitry Eremin-Solenikov static int m62332_remove(struct i2c_client *client) 232b87b0c0fSDmitry Eremin-Solenikov { 233b87b0c0fSDmitry Eremin-Solenikov struct iio_dev *indio_dev = i2c_get_clientdata(client); 234b87b0c0fSDmitry Eremin-Solenikov 235b87b0c0fSDmitry Eremin-Solenikov iio_device_unregister(indio_dev); 236b87b0c0fSDmitry Eremin-Solenikov iio_map_array_unregister(indio_dev); 237847e3928SHartmut Knaack m62332_set_value(indio_dev, 0, 0); 238847e3928SHartmut Knaack m62332_set_value(indio_dev, 0, 1); 239b87b0c0fSDmitry Eremin-Solenikov 240b87b0c0fSDmitry Eremin-Solenikov return 0; 241b87b0c0fSDmitry Eremin-Solenikov } 242b87b0c0fSDmitry Eremin-Solenikov 243b87b0c0fSDmitry Eremin-Solenikov static const struct i2c_device_id m62332_id[] = { 244b87b0c0fSDmitry Eremin-Solenikov { "m62332", }, 245b87b0c0fSDmitry Eremin-Solenikov { } 246b87b0c0fSDmitry Eremin-Solenikov }; 247b87b0c0fSDmitry Eremin-Solenikov MODULE_DEVICE_TABLE(i2c, m62332_id); 248b87b0c0fSDmitry Eremin-Solenikov 249b87b0c0fSDmitry Eremin-Solenikov static struct i2c_driver m62332_driver = { 250b87b0c0fSDmitry Eremin-Solenikov .driver = { 251b87b0c0fSDmitry Eremin-Solenikov .name = "m62332", 252b87b0c0fSDmitry Eremin-Solenikov .pm = M62332_PM_OPS, 253b87b0c0fSDmitry Eremin-Solenikov }, 254b87b0c0fSDmitry Eremin-Solenikov .probe = m62332_probe, 255b87b0c0fSDmitry Eremin-Solenikov .remove = m62332_remove, 256b87b0c0fSDmitry Eremin-Solenikov .id_table = m62332_id, 257b87b0c0fSDmitry Eremin-Solenikov }; 258b87b0c0fSDmitry Eremin-Solenikov module_i2c_driver(m62332_driver); 259b87b0c0fSDmitry Eremin-Solenikov 260b87b0c0fSDmitry Eremin-Solenikov MODULE_AUTHOR("Dmitry Eremin-Solenikov"); 261b87b0c0fSDmitry Eremin-Solenikov MODULE_DESCRIPTION("M62332 8-bit DAC"); 262b87b0c0fSDmitry Eremin-Solenikov MODULE_LICENSE("GPL v2"); 263