cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/touchscreen/ad7879-spi.c

/*
 * AD7879/AD7889 touchscreen (SPI bus)
 *
 * Copyright (C) 2008-2010 Michael Hennerich, Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#include <linux/input.h>	/* BUS_SPI */
#include <linux/pm.h>
#include <linux/spi/spi.h>
#include <linux/module.h>
#include <linux/of.h>

#include "ad7879.h"


#define AD7879_DEVID		0x7A	
/* AD7879/AD7889 */


#define MAX_SPI_FREQ_HZ      5000000

#define AD7879_CMD_MAGIC     0xE000

#define AD7879_CMD_READ      (1 << 10)

#define AD7879_CMD(reg)      (AD7879_CMD_MAGIC | ((reg) & 0xF))

#define AD7879_WRITECMD(reg) (AD7879_CMD(reg))

#define AD7879_READCMD(reg)  (AD7879_CMD(reg) | AD7879_CMD_READ)

/*
 * ad7879_read/write are only used for initial setup and for sysfs controls.
 * The main traffic is done in ad7879_collect().
 */


static int ad7879_spi_xfer(struct spi_device *spi, u16 cmd, u8 count, u16 *tx_buf, u16 *rx_buf) { struct spi_message msg; struct spi_transfer *xfers; void *spi_data; u16 *command; u16 *_rx_buf = _rx_buf; /* shut gcc up */ u8 idx; int ret; xfers = spi_data = kzalloc(sizeof(*xfers) * (count + 2), GFP_KERNEL); if (!spi_data) return -ENOMEM; spi_message_init(&msg); command = spi_data; command[0] = cmd; if (count == 1) { /* ad7879_spi_{read,write} gave us buf on stack */ command[1] = *tx_buf; tx_buf = &command[1]; _rx_buf = rx_buf; rx_buf = &command[2]; } ++xfers; xfers[0].tx_buf = command; xfers[0].len = 2; spi_message_add_tail(&xfers[0], &msg); ++xfers; for (idx = 0; idx < count; ++idx) { if (rx_buf) xfers[idx].rx_buf = &rx_buf[idx]; if (tx_buf) xfers[idx].tx_buf = &tx_buf[idx]; xfers[idx].len = 2; spi_message_add_tail(&xfers[idx], &msg); } ret = spi_sync(spi, &msg); if (count == 1) _rx_buf[0] = command[2]; kfree(spi_data); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger279100.00%1100.00%
Total279100.00%1100.00%


static int ad7879_spi_multi_read(struct device *dev, u8 first_reg, u8 count, u16 *buf) { struct spi_device *spi = to_spi_device(dev); return ad7879_spi_xfer(spi, AD7879_READCMD(first_reg), count, NULL, buf); }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger48100.00%1100.00%
Total48100.00%1100.00%


static int ad7879_spi_read(struct device *dev, u8 reg) { struct spi_device *spi = to_spi_device(dev); u16 ret, dummy; return ad7879_spi_xfer(spi, AD7879_READCMD(reg), 1, &dummy, &ret) ? : ret; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger51100.00%1100.00%
Total51100.00%1100.00%


static int ad7879_spi_write(struct device *dev, u8 reg, u16 val) { struct spi_device *spi = to_spi_device(dev); u16 dummy; return ad7879_spi_xfer(spi, AD7879_WRITECMD(reg), 1, &val, &dummy); }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger49100.00%1100.00%
Total49100.00%1100.00%

static const struct ad7879_bus_ops ad7879_spi_bus_ops = { .bustype = BUS_SPI, .read = ad7879_spi_read, .multi_read = ad7879_spi_multi_read, .write = ad7879_spi_write, };
static int ad7879_spi_probe(struct spi_device *spi) { struct ad7879 *ts; int err; /* don't exceed max specified SPI CLK frequency */ if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { dev_err(&spi->dev, "SPI CLK %d Hz?\n", spi->max_speed_hz); return -EINVAL; } spi->bits_per_word = 16; err = spi_setup(spi); if (err) { dev_dbg(&spi->dev, "spi master doesn't support 16 bits/word\n"); return err; } ts = ad7879_probe(&spi->dev, AD7879_DEVID, spi->irq, &ad7879_spi_bus_ops); if (IS_ERR(ts)) return PTR_ERR(ts); spi_set_drvdata(spi, ts); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger8771.31%150.00%
Michael Hennerich3528.69%150.00%
Total122100.00%2100.00%


static int ad7879_spi_remove(struct spi_device *spi) { struct ad7879 *ts = spi_get_drvdata(spi); ad7879_remove(ts); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger29100.00%1100.00%
Total29100.00%1100.00%

#ifdef CONFIG_OF static const struct of_device_id ad7879_spi_dt_ids[] = { { .compatible = "adi,ad7879", }, { } }; MODULE_DEVICE_TABLE(of, ad7879_spi_dt_ids); #endif static struct spi_driver ad7879_spi_driver = { .driver = { .name = "ad7879", .pm = &ad7879_pm_ops, .of_match_table = of_match_ptr(ad7879_spi_dt_ids), }, .probe = ad7879_spi_probe, .remove = ad7879_spi_remove, }; module_spi_driver(ad7879_spi_driver); MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); MODULE_DESCRIPTION("AD7879(-1) touchscreen SPI bus driver"); MODULE_LICENSE("GPL"); MODULE_ALIAS("spi:ad7879");

Overall Contributors

PersonTokensPropCommitsCommitProp
Mike Frysinger67488.57%114.29%
Stefan Agner415.39%114.29%
Michael Hennerich354.60%114.29%
Mark Brown60.79%114.29%
Paul Gortmaker30.39%114.29%
Dmitry Torokhov10.13%114.29%
Axel Lin10.13%114.29%
Total761100.00%7100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.