"Peter 'p2' De Schrijver" <peter.de-schrijver@xxxxxxxxx> writes:
> Signed-off-by: Peter 'p2' De Schrijver <peter.de-schrijver@xxxxxxxxx>
> ---
> arch/arm/mach-omap2/debobs.c | 214 ++++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 214 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/mach-omap2/debobs.c
>
> diff --git a/arch/arm/mach-omap2/debobs.c b/arch/arm/mach-omap2/debobs.c
> new file mode 100644
> index 0000000..1bde1f4
> --- /dev/null
> +++ b/arch/arm/mach-omap2/debobs.c
> @@ -0,0 +1,214 @@
> +/*
> + * arch/arm/mach-omap2/debobs.c
> + *
> + * Handle debobs pads
> + *
> + * Copyright (C) 2008 Nokia Corporation
> + *
> + * Written by Peter De Schrijver <peter.de-schrijver@xxxxxxxxx>
> + *
> + * This file is subject to the terms and conditions of the GNU General
> + * Public License. See the file "COPYING" in the main directory of this
> + * archive for more details.
> + *
> + * 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/debugfs.h>
> +#include <linux/uaccess.h>
> +#include <linux/module.h>
> +#include <mach/control.h>
> +#include <mach/mux.h>
> +#include <mach/gpio.h>
> +#include <mach/board.h>
> +
> +#define ETK_GPIO_BEGIN 12
> +#define ETK_GPIO(i) (ETK_GPIO_BEGIN + i)
> +#define NUM_OF_DEBOBS_PADS 18
> +
> +enum debobs_pad_mode {
> + GPIO = 0,
> + OBS = 1,
> + ETK = 2,
> + NO_MODE = 3,
> +};
> +
> +static char *debobs_pad_mode_names[] = {
> + [GPIO] = "GPIO",
> + [OBS] = "OBS",
> + [ETK] = "ETK",
> +};
> +
> +struct obs {
> + u16 offset;
> + u8 value;
> + u8 mask;
> +};
> +
> +struct debobs_pad {
> + enum debobs_pad_mode mode;
> + struct obs core_obs;
> + struct obs wakeup_obs;
> +};
> +
> +static struct debobs_pad debobs_pads[NUM_OF_DEBOBS_PADS];
> +
> +static int debobs_mode_open(struct inode *inode, struct file *file)
> +{
> + file->private_data = inode->i_private;
> +
> + return 0;
> +}
> +
> +static ssize_t debobs_mode_read(struct file *file, char __user *user_buf,
> + size_t count, loff_t *ppos)
> +{
> + char buffer[10];
> + int size;
> + int pad_number = (int)file->private_data;
> + struct debobs_pad *e = &debobs_pads[pad_number];
> +
> + size = snprintf(buffer, sizeof(buffer), "%s\n",
> + debobs_pad_mode_names[e->mode]);
> + return simple_read_from_buffer(user_buf, count, ppos, buffer, size);
> +}
> +
> +static ssize_t debobs_mode_write(struct file *file, const char __user *user_buf,
> + size_t count, loff_t *ppos)
> +{
> + char buffer[10];
> + int buf_size, i, pad_number;
> + u16 muxmode = OMAP34XX_MUX_MODE7;
> +
> + memset(buffer, 0, sizeof(buffer));
> + buf_size = min(count, (sizeof(buffer)-1));
> +
> + if (copy_from_user(buffer, user_buf, buf_size))
> + return -EFAULT;
> +
> + pad_number = (int)file->private_data;
> +
> + for (i = 0; i < NO_MODE; i++) {
> + if (!strnicmp(debobs_pad_mode_names[i],
> + buffer,
> + strlen(debobs_pad_mode_names[i]))) {
> + switch (i) {
> + case ETK:
> + muxmode = OMAP34XX_MUX_MODE0;
> + break;
> + case GPIO:
> + muxmode = OMAP34XX_MUX_MODE4;
> + break;
> + case OBS:
> + muxmode = OMAP34XX_MUX_MODE7;
> + break;
> + }
> + omap_ctrl_writew(muxmode,
> + OMAP343X_PADCONF_ETK(pad_number));
> + debobs_pads[pad_number].mode = i;
> +
> + return count;
> + }
> + }
> +
> + return -EINVAL;
> +}
> +
> +static const struct file_operations debobs_mode_fops = {
> + .open = debobs_mode_open,
> + .read = debobs_mode_read,
> + .write = debobs_mode_write,
> +};
> +
> +static int debobs_get(void *data, u64 *val)
> +{
> + struct obs *o = data;
> +
> + *val = o->value;
> +
> + return 0;
> +}
> +
> +static int debobs_set(void *data, u64 val)
> +{
> + struct obs *o = data;
> +
> + val &= BIT(o->mask) - 1;
> +
> + omap_ctrl_writeb(val, o->offset);
> + o->value = val;
> +
> + return 0;
> +}
> +
> +DEFINE_SIMPLE_ATTRIBUTE(debobs_fops, debobs_get, debobs_set, "%llu\n");
> +
> +static inline int __init _new_debobs_pad(struct debobs_pad *pad, char *name,
> + int number, struct dentry *root)
> +{
> + struct dentry *d;
> + struct obs *o;
> +
> + d = debugfs_create_dir(name, root);
> + if (IS_ERR(d))
> + return PTR_ERR(d);
> +
> + omap_ctrl_writew(OMAP34XX_MUX_MODE4, OMAP343X_PADCONF_ETK(number));
> + omap_set_gpio_direction(ETK_GPIO(number), 1);
> + gpio_export(ETK_GPIO(number), 1);
> + (void) debugfs_create_file("mode", S_IRUGO | S_IWUGO, d,
> + (void *)number, &debobs_mode_fops);
> +
> + o = &pad->core_obs;
> + o->offset = OMAP343X_CONTROL_DEBOBS(number);
> + o->value = omap_ctrl_readw(o->offset);
> + o->mask = 7;
> + (void) debugfs_create_file("coreobs", S_IRUGO | S_IWUGO, d, o,
> + &debobs_fops);
> +
> + o = &pad->wakeup_obs;
> + o->offset = OMAP343X_CONTROL_WKUP_DEBOBSMUX(number);
> + o->value = omap_ctrl_readb(o->offset);
> + o->mask = 5;
> + (void) debugfs_create_file("wakeupobs", S_IRUGO | S_IWUGO, d, o,
> + &debobs_fops);
> +
> + return 0;
> +}
> +
> +static int __init init_debobs(void)
> +{
> + struct dentry *debobs_root;
> + int i, err;
> + char name[10];
> +
> + debobs_root = debugfs_create_dir("debobs", NULL);
> + if (IS_ERR(debobs_root))
> + return PTR_ERR(debobs_root);
> +
> + for (i = 0; i < NUM_OF_DEBOBS_PADS; i++) {
> + if (!omap_request_gpio(ETK_GPIO(i))) {
The cross-platform gpiolib calls should be used here.
> + snprintf(name, sizeof(name), "hw_dbg%d", i);
> + err = _new_debobs_pad(&debobs_pads[i], name, i,
> + debobs_root);
> + if (err) {
> + omap_free_gpio(ETK_GPIO(i));
> + return err;
> + }
> + }
> + }
In the successful case, future calls to gpio_request() to use these
lines will fail, since the line is reserved by the omap_request_gpio()
call.
> + return 0;
> +}
> +
> +late_initcall_sync(init_debobs);
> --
> 1.5.6.3
>
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