linux-imx
Public
Source
committed 1a5bc41a3d2x
static IIO_DEVICE_ATTR(store_eeprom, S_IWUSR, NULL, mcp4725_store_eeprom, 0);/* * mcp4725.c - Support for Microchip MCP4725/6 * * Copyright (C) 2012 Peter Meerwald <pmeerw@pmeerw.net> * * Based on max517 by Roland Stigge <stigge@antcom.de> * * This file is subject to the terms and conditions of version 2 of * the GNU General Public License. See the file COPYING in the main * directory of this archive for more details. * * driver for the Microchip I2C 12-bit digital-to-analog converter (DAC) * (7-bit I2C slave address 0x60, the three LSBs can be configured in * hardware) */struct mcp4725_data { struct i2c_client *client; int id; unsigned ref_mode; bool vref_buffered; u16 dac_value; bool powerdown; unsigned powerdown_mode; struct regulator *vdd_reg; struct regulator *vref_reg;};static int __maybe_unused mcp4725_suspend(struct device *dev){ struct mcp4725_data *data = iio_priv(i2c_get_clientdata( to_i2c_client(dev))); u8 outbuf[2]; outbuf[0] = (data->powerdown_mode + 1) << 4; outbuf[1] = 0; data->powerdown = true; return i2c_master_send(data->client, outbuf, 2);}static int __maybe_unused mcp4725_resume(struct device *dev){ struct mcp4725_data *data = iio_priv(i2c_get_clientdata( to_i2c_client(dev))); u8 outbuf[2]; /* restore previous DAC value */ outbuf[0] = (data->dac_value >> 8) & 0xf; outbuf[1] = data->dac_value & 0xff; data->powerdown = false; return i2c_master_send(data->client, outbuf, 2);}static SIMPLE_DEV_PM_OPS(mcp4725_pm_ops, mcp4725_suspend, mcp4725_resume);static ssize_t mcp4725_store_eeprom(struct device *dev, struct device_attribute *attr, const char *buf, size_t len){ struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct mcp4725_data *data = iio_priv(indio_dev); int tries = 20; u8 inoutbuf[3]; bool state; int ret; ret = strtobool(buf, &state); if (ret < 0) return ret; if (!state) return 0;