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4740f73fe5
CONFIG_HOTPLUG is going away as an option so __devexit is no longer needed. Signed-off-by: Bill Pemberton <wfp5p@virginia.edu> Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com> Cc: Peter Tyser <ptyser@xes-inc.com> Cc: Daniel Walker <dwalker@fifo99.com> Cc: Bryan Huntsman <bryanh@codeaurora.org> Acked-by: David Brown <davidb@codeaurora.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
197 lines
4.8 KiB
C
197 lines
4.8 KiB
C
/*
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* Copyright 2009-2010 Pengutronix
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* Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
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*
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* loosely based on an earlier driver that has
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* Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License version 2 as published by the
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* Free Software Foundation.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/mutex.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/mc13xxx.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/err.h>
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#include <linux/spi/spi.h>
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#include "mc13xxx.h"
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static const struct spi_device_id mc13xxx_device_id[] = {
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{
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.name = "mc13783",
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.driver_data = MC13XXX_ID_MC13783,
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}, {
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.name = "mc13892",
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.driver_data = MC13XXX_ID_MC13892,
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}, {
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/* sentinel */
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}
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};
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MODULE_DEVICE_TABLE(spi, mc13xxx_device_id);
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static const struct of_device_id mc13xxx_dt_ids[] = {
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{ .compatible = "fsl,mc13783", .data = (void *) MC13XXX_ID_MC13783, },
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{ .compatible = "fsl,mc13892", .data = (void *) MC13XXX_ID_MC13892, },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
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static struct regmap_config mc13xxx_regmap_spi_config = {
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.reg_bits = 7,
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.pad_bits = 1,
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.val_bits = 24,
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.write_flag_mask = 0x80,
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.max_register = MC13XXX_NUMREGS,
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.cache_type = REGCACHE_NONE,
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.use_single_rw = 1,
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};
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static int mc13xxx_spi_read(void *context, const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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unsigned char w[4] = { *((unsigned char *) reg), 0, 0, 0};
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unsigned char r[4];
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unsigned char *p = val;
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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struct spi_transfer t = {
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.tx_buf = w,
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.rx_buf = r,
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.len = 4,
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};
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struct spi_message m;
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int ret;
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if (val_size != 3 || reg_size != 1)
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return -ENOTSUPP;
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spi_message_init(&m);
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spi_message_add_tail(&t, &m);
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ret = spi_sync(spi, &m);
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memcpy(p, &r[1], 3);
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return ret;
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}
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static int mc13xxx_spi_write(void *context, const void *data, size_t count)
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{
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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if (count != 4)
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return -ENOTSUPP;
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return spi_write(spi, data, count);
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}
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/*
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* We cannot use regmap-spi generic bus implementation here.
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* The MC13783 chip will get corrupted if CS signal is deasserted
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* and on i.Mx31 SoC (the target SoC for MC13783 PMIC) the SPI controller
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* has the following errata (DSPhl22960):
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* "The CSPI negates SS when the FIFO becomes empty with
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* SSCTL= 0. Software cannot guarantee that the FIFO will not
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* drain because of higher priority interrupts and the
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* non-realtime characteristics of the operating system. As a
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* result, the SS will negate before all of the data has been
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* transferred to/from the peripheral."
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* We workaround this by accessing the SPI controller with a
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* single transfert.
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*/
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static struct regmap_bus regmap_mc13xxx_bus = {
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.write = mc13xxx_spi_write,
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.read = mc13xxx_spi_read,
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};
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static int mc13xxx_spi_probe(struct spi_device *spi)
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{
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struct mc13xxx *mc13xxx;
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struct mc13xxx_platform_data *pdata = dev_get_platdata(&spi->dev);
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int ret;
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mc13xxx = devm_kzalloc(&spi->dev, sizeof(*mc13xxx), GFP_KERNEL);
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if (!mc13xxx)
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return -ENOMEM;
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dev_set_drvdata(&spi->dev, mc13xxx);
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spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
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mc13xxx->dev = &spi->dev;
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mutex_init(&mc13xxx->lock);
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mc13xxx->regmap = devm_regmap_init(&spi->dev, ®map_mc13xxx_bus,
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&spi->dev,
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&mc13xxx_regmap_spi_config);
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if (IS_ERR(mc13xxx->regmap)) {
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ret = PTR_ERR(mc13xxx->regmap);
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dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
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ret);
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dev_set_drvdata(&spi->dev, NULL);
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return ret;
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}
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ret = mc13xxx_common_init(mc13xxx, pdata, spi->irq);
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if (ret) {
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dev_set_drvdata(&spi->dev, NULL);
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} else {
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const struct spi_device_id *devid =
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spi_get_device_id(spi);
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if (!devid || devid->driver_data != mc13xxx->ictype)
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dev_warn(mc13xxx->dev,
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"device id doesn't match auto detection!\n");
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}
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return ret;
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}
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static int mc13xxx_spi_remove(struct spi_device *spi)
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{
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struct mc13xxx *mc13xxx = dev_get_drvdata(&spi->dev);
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mc13xxx_common_cleanup(mc13xxx);
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return 0;
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}
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static struct spi_driver mc13xxx_spi_driver = {
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.id_table = mc13xxx_device_id,
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.driver = {
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.name = "mc13xxx",
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.owner = THIS_MODULE,
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.of_match_table = mc13xxx_dt_ids,
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},
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.probe = mc13xxx_spi_probe,
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.remove = mc13xxx_spi_remove,
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};
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static int __init mc13xxx_init(void)
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{
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return spi_register_driver(&mc13xxx_spi_driver);
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}
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subsys_initcall(mc13xxx_init);
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static void __exit mc13xxx_exit(void)
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{
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spi_unregister_driver(&mc13xxx_spi_driver);
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}
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module_exit(mc13xxx_exit);
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MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
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MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
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MODULE_LICENSE("GPL v2");
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