// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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/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 = (kernel_ulong_t)&mc13xxx_variant_mc13783,
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}, {
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.name = "mc13892",
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.driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
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}, {
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.name = "mc34708",
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.driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
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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 = &mc13xxx_variant_mc13783, },
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{ .compatible = "fsl,mc13892", .data = &mc13xxx_variant_mc13892, },
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{ .compatible = "fsl,mc34708", .data = &mc13xxx_variant_mc34708, },
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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 const 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_read = true,
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.use_single_write = true,
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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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const char *reg = data;
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if (count != 4)
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return -ENOTSUPP;
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/* include errata fix for spi audio problems */
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if (*reg == MC13783_AUDIO_CODEC || *reg == MC13783_AUDIO_DAC)
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spi_write(spi, data, count);
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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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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->irq = spi->irq;
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spi->max_speed_hz = spi->max_speed_hz ? : 26000000;
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ret = spi_setup(spi);
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if (ret)
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return ret;
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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(&spi->dev, "Failed to initialize regmap: %d\n", ret);
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return ret;
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}
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if (spi->dev.of_node) {
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const struct of_device_id *of_id =
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of_match_device(mc13xxx_dt_ids, &spi->dev);
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mc13xxx->variant = of_id->data;
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} else {
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const struct spi_device_id *id_entry = spi_get_device_id(spi);
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mc13xxx->variant = (void *)id_entry->driver_data;
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}
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return mc13xxx_common_init(&spi->dev);
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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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return mc13xxx_common_exit(&spi->dev);
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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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.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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