Adds spi specific code for mc13xxx. Most code extracted from the previous mc13xxx-core.c
Signed-off-by: Marc Reilly <[email protected]> --- drivers/mfd/mc13xxx-spi.c | 168 +++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 168 insertions(+), 0 deletions(-) create mode 100644 drivers/mfd/mc13xxx-spi.c diff --git a/drivers/mfd/mc13xxx-spi.c b/drivers/mfd/mc13xxx-spi.c new file mode 100644 index 0000000..de832ea --- /dev/null +++ b/drivers/mfd/mc13xxx-spi.c @@ -0,0 +1,168 @@ +/* + * Copyright 2009-2010 Pengutronix + * Uwe Kleine-Koenig <[email protected]> + * + * loosely based on an earlier driver that has + * Copyright 2009 Pengutronix, Sascha Hauer <[email protected]> + * + * 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/spi/spi.h> +#include <linux/mfd/core.h> +#include <linux/mfd/mc13xxx.h> + +#define MC13XXX_REGOFFSET_SHIFT 25 +static int mc13xxx_spi_reg_read(struct mc13xxx *mc13xxx, + unsigned int offset, u32 *val) +{ + struct spi_transfer t; + struct spi_message m; + int ret; + + *val = offset << MC13XXX_REGOFFSET_SHIFT; + + memset(&t, 0, sizeof(t)); + + t.tx_buf = val; + t.rx_buf = val; + t.len = sizeof(u32); + + spi_message_init(&m); + spi_message_add_tail(&t, &m); + + ret = spi_sync(mc13xxx->spidev, &m); + + /* error in message.status implies error return from spi_sync */ + BUG_ON(!ret && m.status); + + if (ret) + return ret; + + *val &= 0xffffff; + + return 0; +} + +static int mc13xxx_spi_reg_write(struct mc13xxx *mc13xxx, unsigned int offset, + u32 val) +{ + u32 buf; + struct spi_transfer t; + struct spi_message m; + int ret; + + buf = 1 << 31 | offset << MC13XXX_REGOFFSET_SHIFT | val; + + memset(&t, 0, sizeof(t)); + + t.tx_buf = &buf; + t.rx_buf = &buf; + t.len = sizeof(u32); + + spi_message_init(&m); + spi_message_add_tail(&t, &m); + + ret = spi_sync(mc13xxx->spidev, &m); + + BUG_ON(!ret && m.status); + + if (ret) + return ret; + + return 0; +} + +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 = kzalloc(sizeof(*mc13xxx), GFP_KERNEL); + if (!mc13xxx) + return -ENOMEM; + + dev_set_drvdata(&spi->dev, mc13xxx); + spi->mode = SPI_MODE_0 | SPI_CS_HIGH; + spi->bits_per_word = 32; + spi_setup(spi); + + mc13xxx->dev = &spi->dev; + mc13xxx->spidev = spi; + mc13xxx->read_dev = mc13xxx_spi_reg_read; + mc13xxx->write_dev = mc13xxx_spi_reg_write; + + ret = mc13xxx_common_init(mc13xxx, pdata, spi->irq); + + if (ret) { + dev_set_drvdata(&spi->dev, NULL); + } else { + const struct spi_device_id *devid = + spi_get_device_id(mc13xxx->spidev); + if (!devid || devid->driver_data != mc13xxx->ictype) + dev_warn(mc13xxx->dev, + "device id doesn't match auto detection!\n"); + } + + return ret; +} + + +static int __devexit mc13xxx_spi_remove(struct spi_device *spi) +{ + struct mc13xxx *mc13xxx = dev_get_drvdata(&spi->dev); + + free_irq(spi->irq, mc13xxx); + + mfd_remove_devices(&spi->dev); + + kfree(mc13xxx); + + return 0; +} + +static const struct spi_device_id mc13xxx_device_id[] = { + { + .name = "mc13783", + .driver_data = MC13XXX_ID_MC13783, + }, { + .name = "mc13892", + .driver_data = MC13XXX_ID_MC13892, + }, { + /* sentinel */ + } +}; + +static struct spi_driver mc13xxx_driver = { + .id_table = mc13xxx_device_id, + .driver = { + .name = "mc13xxx", + .bus = &spi_bus_type, + .owner = THIS_MODULE, + }, + .probe = mc13xxx_spi_probe, + .remove = __devexit_p(mc13xxx_spi_remove), +}; + +static int __init mc13xxx_spi_init(void) +{ + return spi_register_driver(&mc13xxx_driver); +} +subsys_initcall(mc13xxx_spi_init); + +static void __exit mc13xxx_spi_exit(void) +{ + spi_unregister_driver(&mc13xxx_driver); +} +module_exit(mc13xxx_spi_exit); + +MODULE_DESCRIPTION("spi driver for Freescale MC13XXX PMIC"); +MODULE_AUTHOR("Uwe Kleine-Koenig <[email protected]>"); +MODULE_LICENSE("GPL v2"); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
