From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/iio/potentiometer/mcp4531.c | 399 ++++++++++++++++++++++++++++++++++++ 1 file changed, 399 insertions(+) create mode 100644 drivers/iio/potentiometer/mcp4531.c (limited to 'drivers/iio/potentiometer/mcp4531.c') diff --git a/drivers/iio/potentiometer/mcp4531.c b/drivers/iio/potentiometer/mcp4531.c new file mode 100644 index 0000000000..f28880ebd7 --- /dev/null +++ b/drivers/iio/potentiometer/mcp4531.c @@ -0,0 +1,399 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Industrial I/O driver for Microchip digital potentiometers + * Copyright (c) 2015 Axentia Technologies AB + * Author: Peter Rosin + * + * Datasheet: http://www.microchip.com/downloads/en/DeviceDoc/22096b.pdf + * + * DEVID #Wipers #Positions Resistor Opts (kOhm) i2c address + * mcp4531 1 129 5, 10, 50, 100 010111x + * mcp4532 1 129 5, 10, 50, 100 01011xx + * mcp4541 1 129 5, 10, 50, 100 010111x + * mcp4542 1 129 5, 10, 50, 100 01011xx + * mcp4551 1 257 5, 10, 50, 100 010111x + * mcp4552 1 257 5, 10, 50, 100 01011xx + * mcp4561 1 257 5, 10, 50, 100 010111x + * mcp4562 1 257 5, 10, 50, 100 01011xx + * mcp4631 2 129 5, 10, 50, 100 0101xxx + * mcp4632 2 129 5, 10, 50, 100 01011xx + * mcp4641 2 129 5, 10, 50, 100 0101xxx + * mcp4642 2 129 5, 10, 50, 100 01011xx + * mcp4651 2 257 5, 10, 50, 100 0101xxx + * mcp4652 2 257 5, 10, 50, 100 01011xx + * mcp4661 2 257 5, 10, 50, 100 0101xxx + * mcp4662 2 257 5, 10, 50, 100 01011xx + */ + +#include +#include +#include +#include +#include + +#include + +struct mcp4531_cfg { + int wipers; + int avail[3]; + int kohms; +}; + +enum mcp4531_type { + MCP453x_502, + MCP453x_103, + MCP453x_503, + MCP453x_104, + MCP454x_502, + MCP454x_103, + MCP454x_503, + MCP454x_104, + MCP455x_502, + MCP455x_103, + MCP455x_503, + MCP455x_104, + MCP456x_502, + MCP456x_103, + MCP456x_503, + MCP456x_104, + MCP463x_502, + MCP463x_103, + MCP463x_503, + MCP463x_104, + MCP464x_502, + MCP464x_103, + MCP464x_503, + MCP464x_104, + MCP465x_502, + MCP465x_103, + MCP465x_503, + MCP465x_104, + MCP466x_502, + MCP466x_103, + MCP466x_503, + MCP466x_104, +}; + +static const struct mcp4531_cfg mcp4531_cfg[] = { + [MCP453x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, }, + [MCP453x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, }, + [MCP453x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, }, + [MCP453x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, }, + [MCP454x_502] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 5, }, + [MCP454x_103] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 10, }, + [MCP454x_503] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 50, }, + [MCP454x_104] = { .wipers = 1, .avail = { 0, 1, 128 }, .kohms = 100, }, + [MCP455x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, }, + [MCP455x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, }, + [MCP455x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, }, + [MCP455x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, }, + [MCP456x_502] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 5, }, + [MCP456x_103] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 10, }, + [MCP456x_503] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 50, }, + [MCP456x_104] = { .wipers = 1, .avail = { 0, 1, 256 }, .kohms = 100, }, + [MCP463x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, }, + [MCP463x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, }, + [MCP463x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, }, + [MCP463x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, }, + [MCP464x_502] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 5, }, + [MCP464x_103] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 10, }, + [MCP464x_503] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 50, }, + [MCP464x_104] = { .wipers = 2, .avail = { 0, 1, 128 }, .kohms = 100, }, + [MCP465x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, }, + [MCP465x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, }, + [MCP465x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, }, + [MCP465x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, }, + [MCP466x_502] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 5, }, + [MCP466x_103] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 10, }, + [MCP466x_503] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 50, }, + [MCP466x_104] = { .wipers = 2, .avail = { 0, 1, 256 }, .kohms = 100, }, +}; + +#define MCP4531_WRITE (0 << 2) +#define MCP4531_INCR (1 << 2) +#define MCP4531_DECR (2 << 2) +#define MCP4531_READ (3 << 2) + +#define MCP4531_WIPER_SHIFT (4) + +struct mcp4531_data { + struct i2c_client *client; + const struct mcp4531_cfg *cfg; +}; + +#define MCP4531_CHANNEL(ch) { \ + .type = IIO_RESISTANCE, \ + .indexed = 1, \ + .output = 1, \ + .channel = (ch), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_RAW), \ +} + +static const struct iio_chan_spec mcp4531_channels[] = { + MCP4531_CHANNEL(0), + MCP4531_CHANNEL(1), +}; + +static int mcp4531_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct mcp4531_data *data = iio_priv(indio_dev); + int address = chan->channel << MCP4531_WIPER_SHIFT; + s32 ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = i2c_smbus_read_word_swapped(data->client, + MCP4531_READ | address); + if (ret < 0) + return ret; + *val = ret; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val = 1000 * data->cfg->kohms; + *val2 = data->cfg->avail[2]; + return IIO_VAL_FRACTIONAL; + } + + return -EINVAL; +} + +static int mcp4531_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + struct mcp4531_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + *length = ARRAY_SIZE(data->cfg->avail); + *vals = data->cfg->avail; + *type = IIO_VAL_INT; + return IIO_AVAIL_RANGE; + } + + return -EINVAL; +} + +static int mcp4531_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct mcp4531_data *data = iio_priv(indio_dev); + int address = chan->channel << MCP4531_WIPER_SHIFT; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (val > data->cfg->avail[2] || val < 0) + return -EINVAL; + break; + default: + return -EINVAL; + } + + return i2c_smbus_write_byte_data(data->client, + MCP4531_WRITE | address | (val >> 8), + val & 0xff); +} + +static const struct iio_info mcp4531_info = { + .read_raw = mcp4531_read_raw, + .read_avail = mcp4531_read_avail, + .write_raw = mcp4531_write_raw, +}; + +#define MCP4531_ID_TABLE(_name, cfg) { \ + .name = _name, \ + .driver_data = (kernel_ulong_t)&mcp4531_cfg[cfg], \ +} + +static const struct i2c_device_id mcp4531_id[] = { + MCP4531_ID_TABLE("mcp4531-502", MCP453x_502), + MCP4531_ID_TABLE("mcp4531-103", MCP453x_103), + MCP4531_ID_TABLE("mcp4531-503", MCP453x_503), + MCP4531_ID_TABLE("mcp4531-104", MCP453x_104), + MCP4531_ID_TABLE("mcp4532-502", MCP453x_502), + MCP4531_ID_TABLE("mcp4532-103", MCP453x_103), + MCP4531_ID_TABLE("mcp4532-503", MCP453x_503), + MCP4531_ID_TABLE("mcp4532-104", MCP453x_104), + MCP4531_ID_TABLE("mcp4541-502", MCP454x_502), + MCP4531_ID_TABLE("mcp4541-103", MCP454x_103), + MCP4531_ID_TABLE("mcp4541-503", MCP454x_503), + MCP4531_ID_TABLE("mcp4541-104", MCP454x_104), + MCP4531_ID_TABLE("mcp4542-502", MCP454x_502), + MCP4531_ID_TABLE("mcp4542-103", MCP454x_103), + MCP4531_ID_TABLE("mcp4542-503", MCP454x_503), + MCP4531_ID_TABLE("mcp4542-104", MCP454x_104), + MCP4531_ID_TABLE("mcp4551-502", MCP455x_502), + MCP4531_ID_TABLE("mcp4551-103", MCP455x_103), + MCP4531_ID_TABLE("mcp4551-503", MCP455x_503), + MCP4531_ID_TABLE("mcp4551-104", MCP455x_104), + MCP4531_ID_TABLE("mcp4552-502", MCP455x_502), + MCP4531_ID_TABLE("mcp4552-103", MCP455x_103), + MCP4531_ID_TABLE("mcp4552-503", MCP455x_503), + MCP4531_ID_TABLE("mcp4552-104", MCP455x_104), + MCP4531_ID_TABLE("mcp4561-502", MCP456x_502), + MCP4531_ID_TABLE("mcp4561-103", MCP456x_103), + MCP4531_ID_TABLE("mcp4561-503", MCP456x_503), + MCP4531_ID_TABLE("mcp4561-104", MCP456x_104), + MCP4531_ID_TABLE("mcp4562-502", MCP456x_502), + MCP4531_ID_TABLE("mcp4562-103", MCP456x_103), + MCP4531_ID_TABLE("mcp4562-503", MCP456x_503), + MCP4531_ID_TABLE("mcp4562-104", MCP456x_104), + MCP4531_ID_TABLE("mcp4631-502", MCP463x_502), + MCP4531_ID_TABLE("mcp4631-103", MCP463x_103), + MCP4531_ID_TABLE("mcp4631-503", MCP463x_503), + MCP4531_ID_TABLE("mcp4631-104", MCP463x_104), + MCP4531_ID_TABLE("mcp4632-502", MCP463x_502), + MCP4531_ID_TABLE("mcp4632-103", MCP463x_103), + MCP4531_ID_TABLE("mcp4632-503", MCP463x_503), + MCP4531_ID_TABLE("mcp4632-104", MCP463x_104), + MCP4531_ID_TABLE("mcp4641-502", MCP464x_502), + MCP4531_ID_TABLE("mcp4641-103", MCP464x_103), + MCP4531_ID_TABLE("mcp4641-503", MCP464x_503), + MCP4531_ID_TABLE("mcp4641-104", MCP464x_104), + MCP4531_ID_TABLE("mcp4642-502", MCP464x_502), + MCP4531_ID_TABLE("mcp4642-103", MCP464x_103), + MCP4531_ID_TABLE("mcp4642-503", MCP464x_503), + MCP4531_ID_TABLE("mcp4642-104", MCP464x_104), + MCP4531_ID_TABLE("mcp4651-502", MCP465x_502), + MCP4531_ID_TABLE("mcp4651-103", MCP465x_103), + MCP4531_ID_TABLE("mcp4651-503", MCP465x_503), + MCP4531_ID_TABLE("mcp4651-104", MCP465x_104), + MCP4531_ID_TABLE("mcp4652-502", MCP465x_502), + MCP4531_ID_TABLE("mcp4652-103", MCP465x_103), + MCP4531_ID_TABLE("mcp4652-503", MCP465x_503), + MCP4531_ID_TABLE("mcp4652-104", MCP465x_104), + MCP4531_ID_TABLE("mcp4661-502", MCP466x_502), + MCP4531_ID_TABLE("mcp4661-103", MCP466x_103), + MCP4531_ID_TABLE("mcp4661-503", MCP466x_503), + MCP4531_ID_TABLE("mcp4661-104", MCP466x_104), + MCP4531_ID_TABLE("mcp4662-502", MCP466x_502), + MCP4531_ID_TABLE("mcp4662-103", MCP466x_103), + MCP4531_ID_TABLE("mcp4662-503", MCP466x_503), + MCP4531_ID_TABLE("mcp4662-104", MCP466x_104), + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, mcp4531_id); + +#define MCP4531_COMPATIBLE(of_compatible, cfg) { \ + .compatible = of_compatible, \ + .data = &mcp4531_cfg[cfg], \ +} + +static const struct of_device_id mcp4531_of_match[] = { + MCP4531_COMPATIBLE("microchip,mcp4531-502", MCP453x_502), + MCP4531_COMPATIBLE("microchip,mcp4531-103", MCP453x_103), + MCP4531_COMPATIBLE("microchip,mcp4531-503", MCP453x_503), + MCP4531_COMPATIBLE("microchip,mcp4531-104", MCP453x_104), + MCP4531_COMPATIBLE("microchip,mcp4532-502", MCP453x_502), + MCP4531_COMPATIBLE("microchip,mcp4532-103", MCP453x_103), + MCP4531_COMPATIBLE("microchip,mcp4532-503", MCP453x_503), + MCP4531_COMPATIBLE("microchip,mcp4532-104", MCP453x_104), + MCP4531_COMPATIBLE("microchip,mcp4541-502", MCP454x_502), + MCP4531_COMPATIBLE("microchip,mcp4541-103", MCP454x_103), + MCP4531_COMPATIBLE("microchip,mcp4541-503", MCP454x_503), + MCP4531_COMPATIBLE("microchip,mcp4541-104", MCP454x_104), + MCP4531_COMPATIBLE("microchip,mcp4542-502", MCP454x_502), + MCP4531_COMPATIBLE("microchip,mcp4542-103", MCP454x_103), + MCP4531_COMPATIBLE("microchip,mcp4542-503", MCP454x_503), + MCP4531_COMPATIBLE("microchip,mcp4542-104", MCP454x_104), + MCP4531_COMPATIBLE("microchip,mcp4551-502", MCP455x_502), + MCP4531_COMPATIBLE("microchip,mcp4551-103", MCP455x_103), + MCP4531_COMPATIBLE("microchip,mcp4551-503", MCP455x_503), + MCP4531_COMPATIBLE("microchip,mcp4551-104", MCP455x_104), + MCP4531_COMPATIBLE("microchip,mcp4552-502", MCP455x_502), + MCP4531_COMPATIBLE("microchip,mcp4552-103", MCP455x_103), + MCP4531_COMPATIBLE("microchip,mcp4552-503", MCP455x_503), + MCP4531_COMPATIBLE("microchip,mcp4552-104", MCP455x_104), + MCP4531_COMPATIBLE("microchip,mcp4561-502", MCP456x_502), + MCP4531_COMPATIBLE("microchip,mcp4561-103", MCP456x_103), + MCP4531_COMPATIBLE("microchip,mcp4561-503", MCP456x_503), + MCP4531_COMPATIBLE("microchip,mcp4561-104", MCP456x_104), + MCP4531_COMPATIBLE("microchip,mcp4562-502", MCP456x_502), + MCP4531_COMPATIBLE("microchip,mcp4562-103", MCP456x_103), + MCP4531_COMPATIBLE("microchip,mcp4562-503", MCP456x_503), + MCP4531_COMPATIBLE("microchip,mcp4562-104", MCP456x_104), + MCP4531_COMPATIBLE("microchip,mcp4631-502", MCP463x_502), + MCP4531_COMPATIBLE("microchip,mcp4631-103", MCP463x_103), + MCP4531_COMPATIBLE("microchip,mcp4631-503", MCP463x_503), + MCP4531_COMPATIBLE("microchip,mcp4631-104", MCP463x_104), + MCP4531_COMPATIBLE("microchip,mcp4632-502", MCP463x_502), + MCP4531_COMPATIBLE("microchip,mcp4632-103", MCP463x_103), + MCP4531_COMPATIBLE("microchip,mcp4632-503", MCP463x_503), + MCP4531_COMPATIBLE("microchip,mcp4632-104", MCP463x_104), + MCP4531_COMPATIBLE("microchip,mcp4641-502", MCP464x_502), + MCP4531_COMPATIBLE("microchip,mcp4641-103", MCP464x_103), + MCP4531_COMPATIBLE("microchip,mcp4641-503", MCP464x_503), + MCP4531_COMPATIBLE("microchip,mcp4641-104", MCP464x_104), + MCP4531_COMPATIBLE("microchip,mcp4642-502", MCP464x_502), + MCP4531_COMPATIBLE("microchip,mcp4642-103", MCP464x_103), + MCP4531_COMPATIBLE("microchip,mcp4642-503", MCP464x_503), + MCP4531_COMPATIBLE("microchip,mcp4642-104", MCP464x_104), + MCP4531_COMPATIBLE("microchip,mcp4651-502", MCP465x_502), + MCP4531_COMPATIBLE("microchip,mcp4651-103", MCP465x_103), + MCP4531_COMPATIBLE("microchip,mcp4651-503", MCP465x_503), + MCP4531_COMPATIBLE("microchip,mcp4651-104", MCP465x_104), + MCP4531_COMPATIBLE("microchip,mcp4652-502", MCP465x_502), + MCP4531_COMPATIBLE("microchip,mcp4652-103", MCP465x_103), + MCP4531_COMPATIBLE("microchip,mcp4652-503", MCP465x_503), + MCP4531_COMPATIBLE("microchip,mcp4652-104", MCP465x_104), + MCP4531_COMPATIBLE("microchip,mcp4661-502", MCP466x_502), + MCP4531_COMPATIBLE("microchip,mcp4661-103", MCP466x_103), + MCP4531_COMPATIBLE("microchip,mcp4661-503", MCP466x_503), + MCP4531_COMPATIBLE("microchip,mcp4661-104", MCP466x_104), + MCP4531_COMPATIBLE("microchip,mcp4662-502", MCP466x_502), + MCP4531_COMPATIBLE("microchip,mcp4662-103", MCP466x_103), + MCP4531_COMPATIBLE("microchip,mcp4662-503", MCP466x_503), + MCP4531_COMPATIBLE("microchip,mcp4662-104", MCP466x_104), + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mcp4531_of_match); + +static int mcp4531_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct mcp4531_data *data; + struct iio_dev *indio_dev; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_WORD_DATA)) { + dev_err(dev, "SMBUS Word Data not supported\n"); + return -EOPNOTSUPP; + } + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + data->client = client; + + data->cfg = i2c_get_match_data(client); + + indio_dev->info = &mcp4531_info; + indio_dev->channels = mcp4531_channels; + indio_dev->num_channels = data->cfg->wipers; + indio_dev->name = client->name; + + return devm_iio_device_register(dev, indio_dev); +} + +static struct i2c_driver mcp4531_driver = { + .driver = { + .name = "mcp4531", + .of_match_table = mcp4531_of_match, + }, + .probe = mcp4531_probe, + .id_table = mcp4531_id, +}; + +module_i2c_driver(mcp4531_driver); + +MODULE_AUTHOR("Peter Rosin "); +MODULE_DESCRIPTION("MCP4531 digital potentiometer"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3