On Mon, Dec 7, 2009 at 1:48 PM, Cory Maccarrone <darkstar6262@xxxxxxxxx> wrote:
> This change adds the OMAP SPI 100k driver created by
> Fabrice Crohas <fcrohas@xxxxxxxxx>. This SPI bus is found on
> OMAP7xx-series smartphones, and for many, the touchscreen is
> attached to this bus.
>
> The lion's share of the work was done by Fabrice on this driver --
> I am merely porting it from the Linwizard project on his behalf.
>
> Signed-off-by: Cory Maccarrone <darkstar6262@xxxxxxxxx>
> ---
> drivers/spi/Kconfig | 6 +
> drivers/spi/Makefile | 1 +
> drivers/spi/omap_spi_100k.c | 642 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 649 insertions(+), 0 deletions(-)
> create mode 100644 drivers/spi/omap_spi_100k.c
>
> diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> index 4b6f7cb..7ef9b12 100644
> --- a/drivers/spi/Kconfig
> +++ b/drivers/spi/Kconfig
> @@ -164,6 +164,12 @@ config SPI_OMAP24XX
> SPI master controller for OMAP24xx/OMAP34xx Multichannel SPI
> (McSPI) modules.
>
> +config SPI_OMAP_100K
> + tristate "OMAP SPI 100K"
> + depends on SPI_MASTER && (ARCH_OMAP850 || ARCH_OMAP730)
> + help
> + OMAP SPI 100K master controller for omap7xx boards.
> +
> config SPI_ORION
> tristate "Orion SPI master (EXPERIMENTAL)"
> depends on PLAT_ORION && EXPERIMENTAL
> diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> index 21a1182..55f670d 100644
> --- a/drivers/spi/Makefile
> +++ b/drivers/spi/Makefile
> @@ -22,6 +22,7 @@ obj-$(CONFIG_SPI_LM70_LLP) += spi_lm70llp.o
> obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.o
> obj-$(CONFIG_SPI_OMAP_UWIRE) += omap_uwire.o
> obj-$(CONFIG_SPI_OMAP24XX) += omap2_mcspi.o
> +obj-$(CONFIG_SPI_OMAP_100K) += omap_spi_100k.o
> obj-$(CONFIG_SPI_ORION) += orion_spi.o
> obj-$(CONFIG_SPI_PL022) += amba-pl022.o
> obj-$(CONFIG_SPI_MPC52xx_PSC) += mpc52xx_psc_spi.o
> diff --git a/drivers/spi/omap_spi_100k.c b/drivers/spi/omap_spi_100k.c
> new file mode 100644
> index 0000000..d0ebfa8
> --- /dev/null
> +++ b/drivers/spi/omap_spi_100k.c
> @@ -0,0 +1,642 @@
> +/*
> + * OMAP7xx SPI 100k controller driver
> + * Author: Fabrice Crohas <fcrohas@xxxxxxxxx>
> + * from original omap1_mcspi driver
> + *
> + * Copyright (C) 2005, 2006 Nokia Corporation
> + * Author: Samuel Ortiz <samuel.ortiz@xxxxxxxxx> and
> + * Juha Yrj�l� <juha.yrjola@xxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
> + *
> + */
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/platform_device.h>
> +#include <linux/err.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +
> +#include <linux/spi/spi.h>
> +
> +#include <plat/clock.h>
> +
> +#define OMAP1_SPI100K_MAX_FREQ 48000000
> +
> +#define ICR_SPITAS (OMAP7XX_ICR_BASE + 0x12)
> +
> +#define SPI_SETUP1 0x00
> +#define SPI_SETUP2 0x02
> +#define SPI_CTRL 0x04
> +#define SPI_STATUS 0x06
> +#define SPI_TX_LSB 0x08
> +#define SPI_TX_MSB 0x0a
> +#define SPI_RX_LSB 0x0c
> +#define SPI_RX_MSB 0x0e
> +
> +#define SPI_SETUP1_INT_READ_ENABLE (1UL << 5)
> +#define SPI_SETUP1_INT_WRITE_ENABLE (1UL << 4)
> +#define SPI_SETUP1_CLOCK_DIVISOR(x) ((x) << 1)
> +#define SPI_SETUP1_CLOCK_ENABLE (1UL << 0)
> +
> +#define SPI_SETUP2_ACTIVE_EDGE_FALLING (0UL << 0)
> +#define SPI_SETUP2_ACTIVE_EDGE_RISING (1UL << 0)
> +#define SPI_SETUP2_NEGATIVE_LEVEL (0UL << 5)
> +#define SPI_SETUP2_POSITIVE_LEVEL (1UL << 5)
> +#define SPI_SETUP2_LEVEL_TRIGGER (0UL << 10)
> +#define SPI_SETUP2_EDGE_TRIGGER (1UL << 10)
> +
> +#define SPI_CTRL_SEN(x) ((x) << 7)
> +#define SPI_CTRL_WORD_SIZE(x) (((x) - 1) << 2)
> +#define SPI_CTRL_WR (1UL << 1)
> +#define SPI_CTRL_RD (1UL << 0)
> +
> +#define SPI_STATUS_WE (1UL << 1)
> +#define SPI_STATUS_RD (1UL << 0)
> +
> +#define WRITE 0
> +#define READ 1
> +
> +
> +/* use PIO for small transfers, avoiding DMA setup/teardown overhead and
> + * cache operations; better heuristics consider wordsize and bitrate.
> + */
> +#define DMA_MIN_BYTES 8
> +
> +struct omap1_spi100k {
> + struct work_struct work;
> + /* lock protects queue and registers */
> + spinlock_t lock;
> + struct list_head msg_queue;
> + struct spi_master *master;
> + struct clk *ick;
> + struct clk *fck;
> + /* Virtual base address of the controller */
> + void __iomem *base;
> + unsigned long base_addr;
> +};
> +
> +struct omap1_spi100k_cs {
> + void __iomem *base;
> + int word_len;
> +};
> +
> +static struct workqueue_struct *omap1_spi100k_wq;
> +
> +#define MOD_REG_BIT(val, mask, set) do { \
> + if (set) \
> + val |= mask; \
> + else \
> + val &= ~mask; \
> +} while (0)
> +
> +static void spi100k_enable_clock(struct spi_master *master)
> +{
> + unsigned int val;
> + struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
> +
> + /* enable SPI */
> + val = omap_readw(spi100k->base_addr + SPI_SETUP1);
> + val |= SPI_SETUP1_CLOCK_ENABLE;
> + omap_writew(val, spi100k->base_addr + SPI_SETUP1);
> +}
> +
> +static void spi100k_disable_clock(struct spi_master *master)
> +{
> + unsigned int val;
> + struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
> +
> + /* disable SPI */
> + val = omap_readw(spi100k->base_addr + SPI_SETUP1);
> + val &= ~SPI_SETUP1_CLOCK_ENABLE;
> + omap_writew(val, spi100k->base_addr + SPI_SETUP1);
> +}
> +
> +static void spi100k_write_data(struct spi_master *master, int len, int data)
> +{
> + struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
> +
> + /* write 16-bit word */
> + spi100k_enable_clock(master);
> + omap_writew( data , spi100k->base_addr + SPI_TX_MSB);
> +
> + omap_writew(SPI_CTRL_SEN(0) |
> + SPI_CTRL_WORD_SIZE(len) |
> + SPI_CTRL_WR,
> + spi100k->base_addr + SPI_CTRL);
> +
> + /* Wait for bit ack send change */
> + while((omap_readw(spi100k->base_addr + SPI_STATUS) & SPI_STATUS_WE) != SPI_STATUS_WE);
> + udelay(1000);
> +
> + spi100k_disable_clock(master);
> +}
> +
> +static int spi100k_read_data(struct spi_master *master, int len)
> +{
> + int dataH,dataL;
> + struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
> +
> + spi100k_enable_clock(master);
> + omap_writew(SPI_CTRL_SEN(0) |
> + SPI_CTRL_WORD_SIZE(len) |
> + SPI_CTRL_RD,
> + spi100k->base_addr + SPI_CTRL);
> +
> + while((omap_readw(spi100k->base_addr + SPI_STATUS) & SPI_STATUS_RD) != SPI_STATUS_RD);
> + udelay(1000);
> +
> + dataL = omap_readw(spi100k->base_addr + SPI_RX_LSB);
> + dataH = omap_readw(spi100k->base_addr + SPI_RX_MSB);
> + spi100k_disable_clock(master);
> +
> + return dataL;
> +}
> +
> +static void spi100k_open(struct spi_master *master)
> +{
> + /* get control of SPI */
> + struct omap1_spi100k *spi100k = spi_master_get_devdata(master);
> +
> + omap_writew(SPI_SETUP1_INT_READ_ENABLE |
> + SPI_SETUP1_INT_WRITE_ENABLE |
> + SPI_SETUP1_CLOCK_DIVISOR(0), spi100k->base_addr + SPI_SETUP1);
> +
> + /* configure clock and interrupts */
> + omap_writew(SPI_SETUP2_ACTIVE_EDGE_FALLING |
> + SPI_SETUP2_NEGATIVE_LEVEL |
> + SPI_SETUP2_LEVEL_TRIGGER, spi100k->base_addr + SPI_SETUP2);
> +
> +}
> +
> +static void spi100k_close(struct spi_master *master)
> +{
> +}
setting master->cleanup = NULL shud do
> +static void omap1_spi100k_force_cs(struct omap1_spi100k *spi100k, int enable)
> +{
> + if (enable)
> + omap_writew(0x05fc, spi100k->base_addr + SPI_CTRL);
> + else
> + omap_writew(0x05fd, spi100k->base_addr + SPI_CTRL);
> +}
> +
> +static void omap1_spi100k_set_enable(struct omap1_spi100k *spi100k, int enable)
> +{
> +}
how about dropping it altogether?
> +static unsigned
> +omap1_spi100k_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
> +{
> + struct omap1_spi100k *spi100k;
> + struct omap1_spi100k_cs *cs = spi->controller_state;
> + unsigned int count, c;
> + int word_len;
> +
> + spi100k = spi_master_get_devdata(spi->master);
> + count = xfer->len;
> + c = count;
> + word_len = cs->word_len;
> +
> + /* RX_ONLY mode needs dummy data in TX reg */
> + if (xfer->tx_buf == NULL)
> + spi100k_write_data(spi->master,word_len, 0);
> +
> + if (word_len <= 8) {
> + u8 *rx;
> + const u8 *tx;
> +
> + rx = xfer->rx_buf;
> + tx = xfer->tx_buf;
> + do {
> + c-=1;
> + if (xfer->tx_buf != NULL)
> + spi100k_write_data(spi->master,word_len, *tx);
> + if (xfer->rx_buf != NULL)
> + *rx = spi100k_read_data(spi->master,word_len);
> + } while(c);
> + } else if (word_len <= 16) {
> + u16 *rx;
> + const u16 *tx;
> +
> + rx = xfer->rx_buf;
> + tx = xfer->tx_buf;
> + do {
> + c-=2;
> + if (xfer->tx_buf != NULL)
> + spi100k_write_data(spi->master,word_len, *tx++);
> + if (xfer->rx_buf != NULL)
> + *rx++ = spi100k_read_data(spi->master,word_len);
> + } while(c);
> + } else if (word_len <= 32) {
> + u32 *rx;
> + const u32 *tx;
> +
> + rx = xfer->rx_buf;
> + tx = xfer->tx_buf;
> + do {
> + c-=4;
> + if (xfer->tx_buf != NULL)
> + spi100k_write_data(spi->master,word_len, *tx);
> + if (xfer->rx_buf != NULL)
> + *rx = spi100k_read_data(spi->master,word_len);
> + } while(c);
> + }
> + return count - c;
> +}
> +
> +/* called only when no transfer is active to this device */
> +static int omap1_spi100k_setup_transfer(struct spi_device *spi,
> + struct spi_transfer *t)
> +{
> + struct omap1_spi100k *spi100k = spi_master_get_devdata(spi->master);
> + struct omap1_spi100k_cs *cs = spi->controller_state;
> + u8 word_len = spi->bits_per_word;
> +
> + if (t != NULL && t->bits_per_word)
> + word_len = t->bits_per_word;
> + if (!word_len)
> + word_len = 8;
> +
> + if (spi->bits_per_word > 32)
> + return -EINVAL;
> + cs->word_len = word_len;
> +
> + /* SPI init before transfer */
> + omap_writew(0x3e , spi100k->base_addr + SPI_SETUP1);
> + omap_writew(0x00 , spi100k->base_addr + SPI_STATUS);
> + omap_writew(0x3e , spi100k->base_addr + SPI_CTRL);
> +
> + return 0;
> +}
> +
> +/* the spi->mode bits understood by this driver: */
> +#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH)
> +
> +static int omap1_spi100k_setup(struct spi_device *spi)
> +{
> + int ret;
> + struct omap1_spi100k *spi100k;
> + struct omap1_spi100k_cs *cs = spi->controller_state;
> +
> + if (spi->bits_per_word < 4 || spi->bits_per_word > 32) {
> + dev_dbg(&spi->dev, "setup: unsupported %d bit words\n",
> + spi->bits_per_word);
> + return -EINVAL;
> + }
> +
> + spi100k = spi_master_get_devdata(spi->master);
> +
> + if (!cs) {
> + cs = kzalloc(sizeof *cs, GFP_KERNEL);
> + if (!cs)
> + return -ENOMEM;
> + cs->base = spi100k->base + spi->chip_select * 0x14;
> + spi->controller_state = cs;
> + }
> +
> + spi100k_open(spi->master);
> +
> + clk_enable(spi100k->ick);
> + clk_enable(spi100k->fck);
> +
> + ret = omap1_spi100k_setup_transfer(spi, NULL);
> +
> + clk_disable(spi100k->ick);
> + clk_disable(spi100k->fck);
> +
> + return ret;
> +}
> +
> +static void omap1_spi100k_cleanup(struct spi_device *spi)
> +{
> + spi100k_close(spi->master);
> +}
no need for cleanup callback if u have nothing to do in _close.
> +static void omap1_spi100k_work(struct work_struct *work)
> +{
> + struct omap1_spi100k *spi100k;
> + int status = 0;
> +
> + spi100k = container_of(work, struct omap1_spi100k, work);
> + spin_lock_irq(&spi100k->lock);
> +
> + clk_enable(spi100k->ick);
> + clk_enable(spi100k->fck);
> +
> + /* We only enable one channel at a time -- the one whose message is
> + * at the head of the queue -- although this controller would gladly
> + * arbitrate among multiple channels. This corresponds to "single
> + * channel" master mode. As a side effect, we need to manage the
> + * chipselect with the FORCE bit ... CS != channel enable.
> + */
> + while (!list_empty(&spi100k->msg_queue)) {
> + struct spi_message *m;
> + struct spi_device *spi;
> + struct spi_transfer *t = NULL;
> + int cs_active = 0;
> + struct omap1_spi100k_cs *cs;
> + int par_override = 0;
> +
> + m = container_of(spi100k->msg_queue.next, struct spi_message,
> + queue);
> +
> + list_del_init(&m->queue);
> + spin_unlock_irq(&spi100k->lock);
> +
> + spi = m->spi;
> + cs = spi->controller_state;
> +
> + omap1_spi100k_set_enable(spi100k, 1);
> + list_for_each_entry(t, &m->transfers, transfer_list) {
> + if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
> + status = -EINVAL;
> + break;
> + }
> + if (par_override || t->speed_hz || t->bits_per_word) {
> + par_override = 1;
> + status = omap1_spi100k_setup_transfer(spi, t);
> + if (status < 0)
> + break;
> + if (!t->speed_hz && !t->bits_per_word)
> + par_override = 0;
> + }
> +
> + if (!cs_active) {
> + omap1_spi100k_force_cs(spi100k, 1);
> + cs_active = 1;
> + }
> +
> + if (t->len) {
> + unsigned count;
> +
> + /* RX_ONLY mode needs dummy data in TX reg */
> + if (t->tx_buf == NULL)
> + spi100k_write_data(spi->master, 8, 0);
> +
> + count = omap1_spi100k_txrx_pio(spi, t);
> + m->actual_length += count;
> +
> + if (count != t->len) {
> + status = -EIO;
> + break;
> + }
> + }
> +
> + if (t->delay_usecs)
> + udelay(t->delay_usecs);
> +
> + /* ignore the "leave it on after last xfer" hint */
> +
> + if (t->cs_change) {
> + omap1_spi100k_force_cs(spi100k, 0);
> + cs_active = 0;
> + }
> + }
> +
> + /* Restore defaults if they were overriden */
> + if (par_override) {
> + par_override = 0;
> + status = omap1_spi100k_setup_transfer(spi, NULL);
> + }
> +
> + if (cs_active)
> + omap1_spi100k_force_cs(spi100k, 0);
> +
> + omap1_spi100k_set_enable(spi100k, 0);
> +
> + m->status = status;
> + m->complete(m->context);
> +
> + spin_lock_irq(&spi100k->lock);
> + }
> +
> + clk_disable(spi100k->ick);
> + clk_disable(spi100k->fck);
> + spin_unlock_irq(&spi100k->lock);
> +
> + if (status < 0) {
> + printk(KERN_WARNING "spi transfer failed with %d\n", status);
> + }
no need of {}
> +}
> +
> +static int omap1_spi100k_transfer(struct spi_device *spi, struct spi_message *m)
> +{
> + struct omap1_spi100k *spi100k;
> + unsigned long flags;
> + struct spi_transfer *t;
> +
> + m->actual_length = 0;
> + m->status = 0;
the status shud default to -EINPROGRESS, not success.
> + /* reject invalid messages and transfers */
> + if (list_empty(&m->transfers) || !m->complete)
> + return -EINVAL;
> +
> + list_for_each_entry(t, &m->transfers, transfer_list) {
> + const void *tx_buf = t->tx_buf;
> + void *rx_buf = t->rx_buf;
> + unsigned len = t->len;
> +
> + if (t->speed_hz > OMAP1_SPI100K_MAX_FREQ
> + || (len && !(rx_buf || tx_buf))
> + || (t->bits_per_word &&
> + ( t->bits_per_word < 4
> + || t->bits_per_word > 32))) {
> + dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
> + t->speed_hz,
> + len,
> + tx_buf ? "tx" : "",
> + rx_buf ? "rx" : "",
> + t->bits_per_word);
> + return -EINVAL;
> + }
> +
> + if (t->speed_hz && t->speed_hz < OMAP1_SPI100K_MAX_FREQ/(1<<16)) {
> + dev_dbg(&spi->dev, "%d Hz max exceeds %d\n",
> + t->speed_hz,
> + OMAP1_SPI100K_MAX_FREQ/(1<<16));
> + return -EINVAL;
> + }
> +
> + }
> +
> + spi100k = spi_master_get_devdata(spi->master);
> +
> + spin_lock_irqsave(&spi100k->lock, flags);
> + list_add_tail(&m->queue, &spi100k->msg_queue);
> + queue_work(omap1_spi100k_wq, &spi100k->work);
> + spin_unlock_irqrestore(&spi100k->lock, flags);
> +
> + return 0;
> +}
> +
> +static int __init omap1_spi100k_reset(struct omap1_spi100k *spi100k)
> +{
> + return 0;
> +}
> +
> +static int __devinit omap1_spi100k_probe(struct platform_device *pdev)
> +{
> + struct spi_master *master;
> + struct omap1_spi100k *spi100k;
> + struct resource *r;
> + int status = 0;
> +
> + if ( !pdev->id)
> + return -EINVAL;
> +
> + master = spi_alloc_master(&pdev->dev, sizeof *spi100k);
> + if (master == NULL) {
> + dev_dbg(&pdev->dev, "master allocation failed\n");
> + return -ENOMEM;
> + }
> +
> + if (pdev->id != -1)
> + master->bus_num = pdev->id;
> +
> + master->setup = omap1_spi100k_setup;
> + master->transfer = omap1_spi100k_transfer;
> + master->cleanup = omap1_spi100k_cleanup;
> + master->num_chipselect =2;
> + master->mode_bits = MODEBITS;
> +
> + dev_set_drvdata(&pdev->dev, master);
> +
> + spi100k = spi_master_get_devdata(master);
> + spi100k->master = master;
> +
> + r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (r == NULL) {
> + status = -ENODEV;
> + goto err1;
> + }
> + if (!request_mem_region(r->start, (r->end - r->start) + 1,
> + pdev->name)) {
> + status = -EBUSY;
> + goto err1;
> + }
> +
> + spi100k->base = (void __iomem *) OMAP2_L3_IO_ADDRESS(r->start);
> + spi100k->base_addr = (unsigned long)r->start;
> + INIT_WORK(&spi100k->work, omap1_spi100k_work);
> +
> + spin_lock_init(&spi100k->lock);
> + INIT_LIST_HEAD(&spi100k->msg_queue);
> + spi100k->ick = clk_get(&pdev->dev, "ick");
> + if (IS_ERR(spi100k->ick)) {
> + dev_dbg(&pdev->dev, "can't get spi100k_ick\n");
> + status = PTR_ERR(spi100k->ick);
> + goto err1a;
> + }
> +
> + spi100k->fck = clk_get(&pdev->dev, "fck");
> + if (IS_ERR(spi100k->fck)) {
> + dev_dbg(&pdev->dev, "can't get spi100k_fck\n");
> + status = PTR_ERR(spi100k->fck);
> + goto err2;
> + }
> +
> + if (omap1_spi100k_reset(spi100k) < 0)
> + goto err3;
> +
> + status = spi_register_master(master);
> + if (status < 0)
> + goto err3;
> +
> + printk(KERN_INFO "spi Registered\n");
> + return status;
> +
> +err3:
> + clk_put(spi100k->fck);
> +err2:
> + clk_put(spi100k->ick);
> +err1a:
> + release_mem_region(r->start, (r->end - r->start) + 1);
> +err1:
> + spi_master_put(master);
> + printk(KERN_INFO "Error: spi\n");
> + return status;
> +}
> +
> +static int __exit omap1_spi100k_remove(struct platform_device *pdev)
> +{
> + struct spi_master *master;
> + struct omap1_spi100k *spi100k;
> + struct resource *r;
> +
> + master = dev_get_drvdata(&pdev->dev);
> + spi100k = spi_master_get_devdata(master);
> +
> + clk_put(spi100k->fck);
> + clk_put(spi100k->ick);
> +
> + r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + release_mem_region(r->start, (r->end - r->start) + 1);
> +
> + spi_unregister_master(master);
> +
> + return 0;
> +}
In remove you might want to wait for mssg queue to be flushed?
> +static struct platform_driver omap1_spi100k_driver = {
> + .driver = {
> + .name = "omap1_spi100k",
> + .owner = THIS_MODULE,
> + },
> + .probe = omap1_spi100k_probe,
> + .remove = __exit_p(omap1_spi100k_remove),
> +};
> +
> +
> +static int __init omap1_spi100k_init(void)
> +{
> + int ret;
> +
> + printk(KERN_INFO "In spi init\n");
> + omap1_spi100k_wq = create_singlethread_workqueue(
> + omap1_spi100k_driver.driver.name);
> +
> + if (omap1_spi100k_wq == NULL) {
> + printk(KERN_INFO "Error: spi init\n");
> + return -1;
> + }
> +
> + ret = platform_driver_register(&omap1_spi100k_driver);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void __exit omap1_spi100k_exit(void)
> +{
> + platform_driver_unregister(&omap1_spi100k_driver);
> +
> + destroy_workqueue(omap1_spi100k_wq);
> +}
> +
> +module_init(omap1_spi100k_init);
> +module_exit(omap1_spi100k_exit);
> +
> +MODULE_DESCRIPTION("OMAP7xx SPI 100k controller driver");
> +MODULE_AUTHOR("Fabrice Crohas <fcrohas@xxxxxxxxx>");
> +MODULE_LICENSE("GPL");
> +
> --
> 1.6.3.3
>
>
>
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