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linux-next/drivers/mfd/mc13xxx-spi.c
Linus Torvalds 2dfea3803d This is the MFD patch set for the 3.8 merge window.
We have several new drivers, most of the time coming with their sub devices
 drivers:
 
 - Austria Microsystem's AS3711
 - Nano River's viperboard
 - TI's TPS80031, AM335x TS/ADC,
 - Realtek's MMC/memstick card reader
 - Nokia's retu
 
 We also got some notable cleanups and improvements:
 
 - tps6586x got converted to IRQ domains.
 - tps65910 and tps65090 moved to the regmap IRQ API.
 - STMPE is now Device Tree aware.
 - A general twl6040 and twl-core cleanup, with moves to the regmap I/O and IRQ
   APIs and a conversion to the recently added PWM framework.
 - sta2x11 gained regmap support.
 
 Then the rest is mostly tiny cleanups and fixes, among which we have Mark's
 wm5xxx and wm8xxx patchset.
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Merge tag 'mfd-3.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6

Pull MFS update from Samuel Ortiz:
 "This is the MFD patch set for the 3.8 merge window.

  We have several new drivers, most of the time coming with their sub
  devices drivers:

   - Austria Microsystem's AS3711
   - Nano River's viperboard
   - TI's TPS80031, AM335x TS/ADC,
   - Realtek's MMC/memstick card reader
   - Nokia's retu

  We also got some notable cleanups and improvements:

   - tps6586x got converted to IRQ domains.
   - tps65910 and tps65090 moved to the regmap IRQ API.
   - STMPE is now Device Tree aware.
   - A general twl6040 and twl-core cleanup, with moves to the regmap
     I/O and IRQ APIs and a conversion to the recently added PWM
     framework.
   - sta2x11 gained regmap support.

  Then the rest is mostly tiny cleanups and fixes, among which we have
  Mark's wm5xxx and wm8xxx patchset."

Far amount of annoying but largely trivial conflicts.  Many due to
__devinit/exit removal, others due to one or two of the new drivers also
having come in through another tree.

* tag 'mfd-3.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/sameo/mfd-2.6: (119 commits)
  mfd: tps6507x: Convert to devm_kzalloc
  mfd: stmpe: Update DT support for stmpe driver
  mfd: wm5102: Add readback of DSP status 3 register
  mfd: arizona: Log if we fail to create the primary IRQ domain
  mfd: tps80031: MFD_TPS80031 needs to select REGMAP_IRQ
  mfd: tps80031: Add terminating entry for tps80031_id_table
  mfd: sta2x11: Fix potential NULL pointer dereference in __sta2x11_mfd_mask()
  mfd: wm5102: Add tuning for revision B
  mfd: arizona: Defer patch initialistation until after first device boot
  mfd: tps65910: Fix wrong ack_base register
  mfd: tps65910: Remove unused data
  mfd: stmpe: Get rid of irq_invert_polarity
  mfd: ab8500-core: Fix invalid free of devm_ allocated data
  mfd: wm5102: Mark DSP memory regions as volatile
  mfd: wm5102: Correct default for LDO1_CONTROL_2
  mfd: arizona: Register haptics devices
  mfd: wm8994: Make current device behaviour the default
  mfd: tps65090: MFD_TPS65090 needs to select REGMAP_IRQ
  mfd: Fix stmpe.c build when OF is not enabled
  mfd: jz4740-adc: Use devm_kzalloc
  ...
2012-12-16 18:55:20 -08:00

200 lines
5.0 KiB
C

/*
* Copyright 2009-2010 Pengutronix
* Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
*
* loosely based on an earlier driver that has
* Copyright 2009 Pengutronix, Sascha Hauer <s.hauer@pengutronix.de>
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License version 2 as published by the
* Free Software Foundation.
*/
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/mfd/mc13xxx.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/err.h>
#include <linux/spi/spi.h>
#include "mc13xxx.h"
static const struct spi_device_id mc13xxx_device_id[] = {
{
.name = "mc13783",
.driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13783,
}, {
.name = "mc13892",
.driver_data = (kernel_ulong_t)&mc13xxx_variant_mc13892,
}, {
.name = "mc34708",
.driver_data = (kernel_ulong_t)&mc13xxx_variant_mc34708,
}, {
/* sentinel */
}
};
MODULE_DEVICE_TABLE(spi, mc13xxx_device_id);
static const struct of_device_id mc13xxx_dt_ids[] = {
{ .compatible = "fsl,mc13783", .data = &mc13xxx_variant_mc13783, },
{ .compatible = "fsl,mc13892", .data = &mc13xxx_variant_mc13892, },
{ .compatible = "fsl,mc34708", .data = &mc13xxx_variant_mc34708, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mc13xxx_dt_ids);
static struct regmap_config mc13xxx_regmap_spi_config = {
.reg_bits = 7,
.pad_bits = 1,
.val_bits = 24,
.write_flag_mask = 0x80,
.max_register = MC13XXX_NUMREGS,
.cache_type = REGCACHE_NONE,
.use_single_rw = 1,
};
static int mc13xxx_spi_read(void *context, const void *reg, size_t reg_size,
void *val, size_t val_size)
{
unsigned char w[4] = { *((unsigned char *) reg), 0, 0, 0};
unsigned char r[4];
unsigned char *p = val;
struct device *dev = context;
struct spi_device *spi = to_spi_device(dev);
struct spi_transfer t = {
.tx_buf = w,
.rx_buf = r,
.len = 4,
};
struct spi_message m;
int ret;
if (val_size != 3 || reg_size != 1)
return -ENOTSUPP;
spi_message_init(&m);
spi_message_add_tail(&t, &m);
ret = spi_sync(spi, &m);
memcpy(p, &r[1], 3);
return ret;
}
static int mc13xxx_spi_write(void *context, const void *data, size_t count)
{
struct device *dev = context;
struct spi_device *spi = to_spi_device(dev);
if (count != 4)
return -ENOTSUPP;
return spi_write(spi, data, count);
}
/*
* We cannot use regmap-spi generic bus implementation here.
* The MC13783 chip will get corrupted if CS signal is deasserted
* and on i.Mx31 SoC (the target SoC for MC13783 PMIC) the SPI controller
* has the following errata (DSPhl22960):
* "The CSPI negates SS when the FIFO becomes empty with
* SSCTL= 0. Software cannot guarantee that the FIFO will not
* drain because of higher priority interrupts and the
* non-realtime characteristics of the operating system. As a
* result, the SS will negate before all of the data has been
* transferred to/from the peripheral."
* We workaround this by accessing the SPI controller with a
* single transfert.
*/
static struct regmap_bus regmap_mc13xxx_bus = {
.write = mc13xxx_spi_write,
.read = mc13xxx_spi_read,
};
static int mc13xxx_spi_probe(struct spi_device *spi)
{
struct mc13xxx *mc13xxx;
struct mc13xxx_platform_data *pdata = dev_get_platdata(&spi->dev);
int ret;
mc13xxx = devm_kzalloc(&spi->dev, sizeof(*mc13xxx), GFP_KERNEL);
if (!mc13xxx)
return -ENOMEM;
dev_set_drvdata(&spi->dev, mc13xxx);
spi->mode = SPI_MODE_0 | SPI_CS_HIGH;
mc13xxx->dev = &spi->dev;
mutex_init(&mc13xxx->lock);
mc13xxx->regmap = devm_regmap_init(&spi->dev, &regmap_mc13xxx_bus,
&spi->dev,
&mc13xxx_regmap_spi_config);
if (IS_ERR(mc13xxx->regmap)) {
ret = PTR_ERR(mc13xxx->regmap);
dev_err(mc13xxx->dev, "Failed to initialize register map: %d\n",
ret);
dev_set_drvdata(&spi->dev, NULL);
return ret;
}
if (spi->dev.of_node) {
const struct of_device_id *of_id =
of_match_device(mc13xxx_dt_ids, &spi->dev);
mc13xxx->variant = of_id->data;
} else {
const struct spi_device_id *id_entry = spi_get_device_id(spi);
mc13xxx->variant = (void *)id_entry->driver_data;
}
return mc13xxx_common_init(mc13xxx, pdata, spi->irq);
}
static int mc13xxx_spi_remove(struct spi_device *spi)
{
struct mc13xxx *mc13xxx = dev_get_drvdata(&spi->dev);
mc13xxx_common_cleanup(mc13xxx);
return 0;
}
static struct spi_driver mc13xxx_spi_driver = {
.id_table = mc13xxx_device_id,
.driver = {
.name = "mc13xxx",
.owner = THIS_MODULE,
.of_match_table = mc13xxx_dt_ids,
},
.probe = mc13xxx_spi_probe,
.remove = mc13xxx_spi_remove,
};
static int __init mc13xxx_init(void)
{
return spi_register_driver(&mc13xxx_spi_driver);
}
subsys_initcall(mc13xxx_init);
static void __exit mc13xxx_exit(void)
{
spi_unregister_driver(&mc13xxx_spi_driver);
}
module_exit(mc13xxx_exit);
MODULE_DESCRIPTION("Core driver for Freescale MC13XXX PMIC");
MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
MODULE_LICENSE("GPL v2");