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198 lines
4.9 KiB
198 lines
4.9 KiB
// 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 <[email protected]> |
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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 <[email protected]> |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL v2");
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