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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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d3be83244c
This patch applies the semantic patch: @@ expression I, P, SP; @@ I = devm_iio_device_alloc(P, SP); ... - I->dev.parent = P; It updates 302 files and does 307 deletions. This semantic patch also removes some comments like '/* Establish that the iio_dev is a child of the i2c device */' But this is is only done in case where the block is left empty. The patch does not seem to cover all cases. It looks like in some cases a different variable is used in some cases to assign the parent, but it points to the same reference. In other cases, the block covered by ... may be just too big to be covered by the semantic patch. However, this looks pretty good as well, as it does cover a big bulk of the drivers that should remove the parent assignment. Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
348 lines
7.9 KiB
C
348 lines
7.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* rfd77402.c - Support for RF Digital RFD77402 Time-of-Flight (distance) sensor
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*
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* Copyright 2017 Peter Meerwald-Stadler <pmeerw@pmeerw.net>
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*
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* 7-bit I2C slave address 0x4c
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*
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* TODO: interrupt
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* https://media.digikey.com/pdf/Data%20Sheets/RF%20Digital%20PDFs/RFD77402.pdf
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#define RFD77402_DRV_NAME "rfd77402"
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#define RFD77402_ICSR 0x00 /* Interrupt Control Status Register */
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#define RFD77402_ICSR_INT_MODE BIT(2)
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#define RFD77402_ICSR_INT_POL BIT(3)
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#define RFD77402_ICSR_RESULT BIT(4)
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#define RFD77402_ICSR_M2H_MSG BIT(5)
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#define RFD77402_ICSR_H2M_MSG BIT(6)
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#define RFD77402_ICSR_RESET BIT(7)
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#define RFD77402_CMD_R 0x04
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#define RFD77402_CMD_SINGLE 0x01
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#define RFD77402_CMD_STANDBY 0x10
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#define RFD77402_CMD_MCPU_OFF 0x11
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#define RFD77402_CMD_MCPU_ON 0x12
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#define RFD77402_CMD_RESET BIT(6)
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#define RFD77402_CMD_VALID BIT(7)
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#define RFD77402_STATUS_R 0x06
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#define RFD77402_STATUS_PM_MASK GENMASK(4, 0)
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#define RFD77402_STATUS_STANDBY 0x00
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#define RFD77402_STATUS_MCPU_OFF 0x10
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#define RFD77402_STATUS_MCPU_ON 0x18
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#define RFD77402_RESULT_R 0x08
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#define RFD77402_RESULT_DIST_MASK GENMASK(12, 2)
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#define RFD77402_RESULT_ERR_MASK GENMASK(14, 13)
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#define RFD77402_RESULT_VALID BIT(15)
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#define RFD77402_PMU_CFG 0x14
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#define RFD77402_PMU_MCPU_INIT BIT(9)
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#define RFD77402_I2C_INIT_CFG 0x1c
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#define RFD77402_I2C_ADDR_INCR BIT(0)
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#define RFD77402_I2C_DATA_INCR BIT(2)
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#define RFD77402_I2C_HOST_DEBUG BIT(5)
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#define RFD77402_I2C_MCPU_DEBUG BIT(6)
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#define RFD77402_CMD_CFGR_A 0x0c
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#define RFD77402_CMD_CFGR_B 0x0e
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#define RFD77402_HFCFG_0 0x20
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#define RFD77402_HFCFG_1 0x22
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#define RFD77402_HFCFG_2 0x24
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#define RFD77402_HFCFG_3 0x26
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#define RFD77402_MOD_CHIP_ID 0x28
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/* magic configuration values from datasheet */
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static const struct {
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u8 reg;
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u16 val;
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} rf77402_tof_config[] = {
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{RFD77402_CMD_CFGR_A, 0xe100},
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{RFD77402_CMD_CFGR_B, 0x10ff},
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{RFD77402_HFCFG_0, 0x07d0},
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{RFD77402_HFCFG_1, 0x5008},
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{RFD77402_HFCFG_2, 0xa041},
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{RFD77402_HFCFG_3, 0x45d4},
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};
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struct rfd77402_data {
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struct i2c_client *client;
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/* Serialize reads from the sensor */
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struct mutex lock;
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};
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static const struct iio_chan_spec rfd77402_channels[] = {
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{
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.type = IIO_DISTANCE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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};
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static int rfd77402_set_state(struct rfd77402_data *data, u8 state, u16 check)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(data->client, RFD77402_CMD_R,
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state | RFD77402_CMD_VALID);
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if (ret < 0)
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return ret;
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usleep_range(10000, 20000);
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ret = i2c_smbus_read_word_data(data->client, RFD77402_STATUS_R);
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if (ret < 0)
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return ret;
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if ((ret & RFD77402_STATUS_PM_MASK) != check)
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return -ENODEV;
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return 0;
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}
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static int rfd77402_measure(struct rfd77402_data *data)
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{
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int ret;
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int tries = 10;
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ret = rfd77402_set_state(data, RFD77402_CMD_MCPU_ON,
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RFD77402_STATUS_MCPU_ON);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_write_byte_data(data->client, RFD77402_CMD_R,
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RFD77402_CMD_SINGLE |
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RFD77402_CMD_VALID);
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if (ret < 0)
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goto err;
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while (tries-- > 0) {
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ret = i2c_smbus_read_byte_data(data->client, RFD77402_ICSR);
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if (ret < 0)
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goto err;
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if (ret & RFD77402_ICSR_RESULT)
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break;
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msleep(20);
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}
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if (tries < 0) {
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ret = -ETIMEDOUT;
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goto err;
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}
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ret = i2c_smbus_read_word_data(data->client, RFD77402_RESULT_R);
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if (ret < 0)
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goto err;
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if ((ret & RFD77402_RESULT_ERR_MASK) ||
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!(ret & RFD77402_RESULT_VALID)) {
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ret = -EIO;
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goto err;
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}
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return (ret & RFD77402_RESULT_DIST_MASK) >> 2;
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err:
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rfd77402_set_state(data, RFD77402_CMD_MCPU_OFF,
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RFD77402_STATUS_MCPU_OFF);
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return ret;
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}
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static int rfd77402_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct rfd77402_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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mutex_lock(&data->lock);
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ret = rfd77402_measure(data);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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*val = ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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/* 1 LSB is 1 mm */
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*val = 0;
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*val2 = 1000;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info rfd77402_info = {
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.read_raw = rfd77402_read_raw,
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};
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static int rfd77402_init(struct rfd77402_data *data)
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{
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int ret, i;
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ret = rfd77402_set_state(data, RFD77402_CMD_STANDBY,
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RFD77402_STATUS_STANDBY);
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if (ret < 0)
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return ret;
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/* configure INT pad as push-pull, active low */
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ret = i2c_smbus_write_byte_data(data->client, RFD77402_ICSR,
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RFD77402_ICSR_INT_MODE);
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if (ret < 0)
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return ret;
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/* I2C configuration */
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ret = i2c_smbus_write_word_data(data->client, RFD77402_I2C_INIT_CFG,
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RFD77402_I2C_ADDR_INCR |
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RFD77402_I2C_DATA_INCR |
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RFD77402_I2C_HOST_DEBUG |
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RFD77402_I2C_MCPU_DEBUG);
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if (ret < 0)
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return ret;
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/* set initialization */
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ret = i2c_smbus_write_word_data(data->client, RFD77402_PMU_CFG, 0x0500);
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if (ret < 0)
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return ret;
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ret = rfd77402_set_state(data, RFD77402_CMD_MCPU_OFF,
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RFD77402_STATUS_MCPU_OFF);
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if (ret < 0)
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return ret;
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/* set initialization */
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ret = i2c_smbus_write_word_data(data->client, RFD77402_PMU_CFG, 0x0600);
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if (ret < 0)
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return ret;
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ret = rfd77402_set_state(data, RFD77402_CMD_MCPU_ON,
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RFD77402_STATUS_MCPU_ON);
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if (ret < 0)
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return ret;
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for (i = 0; i < ARRAY_SIZE(rf77402_tof_config); i++) {
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ret = i2c_smbus_write_word_data(data->client,
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rf77402_tof_config[i].reg,
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rf77402_tof_config[i].val);
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if (ret < 0)
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return ret;
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}
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ret = rfd77402_set_state(data, RFD77402_CMD_STANDBY,
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RFD77402_STATUS_STANDBY);
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return ret;
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}
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static int rfd77402_powerdown(struct rfd77402_data *data)
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{
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return rfd77402_set_state(data, RFD77402_CMD_STANDBY,
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RFD77402_STATUS_STANDBY);
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}
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static int rfd77402_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct rfd77402_data *data;
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struct iio_dev *indio_dev;
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int ret;
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ret = i2c_smbus_read_word_data(client, RFD77402_MOD_CHIP_ID);
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if (ret < 0)
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return ret;
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if (ret != 0xad01 && ret != 0xad02) /* known chip ids */
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return -ENODEV;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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mutex_init(&data->lock);
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indio_dev->info = &rfd77402_info;
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indio_dev->channels = rfd77402_channels;
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indio_dev->num_channels = ARRAY_SIZE(rfd77402_channels);
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indio_dev->name = RFD77402_DRV_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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ret = rfd77402_init(data);
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if (ret < 0)
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return ret;
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ret = iio_device_register(indio_dev);
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if (ret)
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goto err_powerdown;
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return 0;
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err_powerdown:
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rfd77402_powerdown(data);
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return ret;
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}
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static int rfd77402_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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iio_device_unregister(indio_dev);
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rfd77402_powerdown(iio_priv(indio_dev));
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int rfd77402_suspend(struct device *dev)
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{
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struct rfd77402_data *data = iio_priv(i2c_get_clientdata(
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to_i2c_client(dev)));
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return rfd77402_powerdown(data);
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}
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static int rfd77402_resume(struct device *dev)
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{
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struct rfd77402_data *data = iio_priv(i2c_get_clientdata(
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to_i2c_client(dev)));
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return rfd77402_init(data);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(rfd77402_pm_ops, rfd77402_suspend, rfd77402_resume);
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static const struct i2c_device_id rfd77402_id[] = {
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{ "rfd77402", 0},
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, rfd77402_id);
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static struct i2c_driver rfd77402_driver = {
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.driver = {
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.name = RFD77402_DRV_NAME,
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.pm = &rfd77402_pm_ops,
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},
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.probe = rfd77402_probe,
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.remove = rfd77402_remove,
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.id_table = rfd77402_id,
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};
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module_i2c_driver(rfd77402_driver);
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MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("RFD77402 Time-of-Flight sensor driver");
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MODULE_LICENSE("GPL");
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