static int pwm_backlight_initial_power_state(const struct pwm_bl_data *pb)
{
struct device_node *node = pb->dev->of_node;
/* Not booted with device tree or no phandle link to the node */
if (!node || !node->phandle)
return FB_BLANK_UNBLANK;
/*
* If the driver is probed from the device tree and there is a
* phandle link pointing to the backlight node, it is safe to
* assume that another driver will enable the backlight at the
* appropriate time. Therefore, if it is disabled, keep it so.
*/
/* if the enable GPIO is disabled, do not enable the backlight */
if (pb->enable_gpio && gpiod_get_value_cansleep(pb->enable_gpio) == 0)
return FB_BLANK_POWERDOWN;
/* The regulator is disabled, do not enable the backlight */
if (!regulator_is_enabled(pb->power_supply))
return FB_BLANK_POWERDOWN;
/* The PWM is disabled, keep it like this */
if (!pwm_is_enabled(pb->pwm))
return FB_BLANK_POWERDOWN;
return FB_BLANK_UNBLANK;
}
static irqreturn_t max3355_id_irq(int irq, void *dev_id)
{
struct max3355_data *data = dev_id;
int id = gpiod_get_value_cansleep(data->id_gpiod);
if (id) {
/*
* ID = 1 means USB HOST cable detached.
* As we don't have event for USB peripheral cable attached,
* we simulate USB peripheral attach here.
*/
extcon_set_cable_state_(data->edev, EXTCON_USB_HOST, false);
extcon_set_cable_state_(data->edev, EXTCON_USB, true);
} else {
/*
* ID = 0 means USB HOST cable attached.
* As we don't have event for USB peripheral cable detached,
* we simulate USB peripheral detach here.
*/
extcon_set_cable_state_(data->edev, EXTCON_USB, false);
extcon_set_cable_state_(data->edev, EXTCON_USB_HOST, true);
}
return IRQ_HANDLED;
}
static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
{
struct pixcir_i2c_ts_data *tsdata = dev_id;
struct pixcir_report_data report;
while (tsdata->running) {
/* parse packet */
pixcir_ts_parse(tsdata, &report);
/* report it */
pixcir_ts_report(tsdata, &report);
if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
if (report.num_touches) {
/*
* Last report with no finger up?
* Do it now then.
*/
input_mt_sync_frame(tsdata->input);
input_sync(tsdata->input);
}
break;
}
msleep(20);
}
return IRQ_HANDLED;
}
static int mdio_get(struct mdiobb_ctrl *ctrl)
{
struct mdio_gpio_info *bitbang =
container_of(ctrl, struct mdio_gpio_info, ctrl);
return gpiod_get_value_cansleep(bitbang->mdio);
}
/* The fixed state is... fixed except for the link state,
* which may be determined by a GPIO or a callback.
*/
static void phylink_get_fixed_state(struct phylink *pl, struct phylink_link_state *state)
{
*state = pl->link_config;
if (pl->get_fixed_state)
pl->get_fixed_state(pl->netdev, state);
else if (pl->link_gpio)
state->link = !!gpiod_get_value_cansleep(pl->link_gpio);
}
int mmc_gpio_get_ro(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
if (!ctx || !ctx->ro_gpio)
return -ENOSYS;
return gpiod_get_value_cansleep(ctx->ro_gpio);
}
static irqreturn_t sis_ts_irq_handler(int irq, void *dev_id)
{
struct sis_ts_data *ts = dev_id;
do {
sis_ts_handle_packet(ts);
} while (ts->attn_gpio && gpiod_get_value_cansleep(ts->attn_gpio));
return IRQ_HANDLED;
}
static int gpio_charger_get_property(struct power_supply *psy,
enum power_supply_property psp, union power_supply_propval *val)
{
struct gpio_charger *gpio_charger = psy_to_gpio_charger(psy);
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = gpiod_get_value_cansleep(gpio_charger->gpiod);
break;
case POWER_SUPPLY_PROP_STATUS:
if (gpiod_get_value_cansleep(gpio_charger->charge_status))
val->intval = POWER_SUPPLY_STATUS_CHARGING;
else
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
default:
return -EINVAL;
}
return 0;
}
int mmc_gpio_get_cd(struct mmc_host *host)
{
struct mmc_gpio *ctx = host->slot.handler_priv;
if (!ctx || !ctx->cd_gpio)
return -ENOSYS;
if (ctx->override_cd_active_level)
return !gpiod_get_raw_value_cansleep(ctx->cd_gpio) ^
!!(host->caps2 & MMC_CAP2_CD_ACTIVE_HIGH);
return gpiod_get_value_cansleep(ctx->cd_gpio);
}
static unsigned int sfp_gpio_get_state(struct sfp *sfp)
{
unsigned int i, state, v;
for (i = state = 0; i < GPIO_MAX; i++) {
if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
continue;
v = gpiod_get_value_cansleep(sfp->gpio[i]);
if (v)
state |= BIT(i);
}
return state;
}
static irqreturn_t sirf_wakeup_handler(int irq, void *dev_id)
{
struct sirf_data *data = dev_id;
struct device *dev = &data->serdev->dev;
int ret;
ret = gpiod_get_value_cansleep(data->wakeup);
dev_dbg(dev, "%s - wakeup = %d\n", __func__, ret);
if (ret < 0)
goto out;
data->active = !!ret;
wake_up_interruptible(&data->power_wait);
out:
return IRQ_HANDLED;
}
static unsigned int rotary_encoder_get_state(struct rotary_encoder *encoder)
{
int i;
unsigned int ret = 0;
for (i = 0; i < encoder->gpios->ndescs; ++i) {
int val = gpiod_get_value_cansleep(encoder->gpios->desc[i]);
/* convert from gray encoding to normal */
if (encoder->encoding == ROTENC_GRAY && ret & 1)
val = !val;
ret = ret << 1 | val;
}
return ret & 3;
}
static int tpd_read_edid(struct omap_dss_device *dssdev,
u8 *edid, int len)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
struct omap_dss_device *in = ddata->in;
int r;
if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
return -ENODEV;
gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);
r = in->ops.hdmi->read_edid(in, edid, len);
gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);
return r;
}
static void palmas_gpio_id_detect(struct work_struct *work)
{
int id;
struct palmas_usb *palmas_usb = container_of(to_delayed_work(work),
struct palmas_usb,
wq_detectid);
struct extcon_dev *edev = palmas_usb->edev;
if (!palmas_usb->id_gpiod)
return;
id = gpiod_get_value_cansleep(palmas_usb->id_gpiod);
if (id) {
extcon_set_state_sync(edev, EXTCON_USB_HOST, false);
dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
} else {
extcon_set_state_sync(edev, EXTCON_USB_HOST, true);
dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
}
}
static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
{
const struct gpio_keys_button *button = bdata->button;
struct input_dev *input = bdata->input;
unsigned int type = button->type ?: EV_KEY;
int state;
state = gpiod_get_value_cansleep(bdata->gpiod);
if (state < 0) {
dev_err(input->dev.parent,
"failed to get gpio state: %d\n", state);
return;
}
if (type == EV_ABS) {
if (state)
input_event(input, type, button->code, button->value);
} else {
input_event(input, type, *bdata->code, state);
}
input_sync(input);
}
static int nokia_reset(struct hci_uart *hu)
{
struct nokia_bt_dev *btdev = hu->priv;
struct device *dev = &btdev->serdev->dev;
int err;
/* reset routine */
gpiod_set_value_cansleep(btdev->reset, 1);
gpiod_set_value_cansleep(btdev->wakeup_bt, 1);
msleep(100);
/* safety check */
err = gpiod_get_value_cansleep(btdev->wakeup_host);
if (err == 1) {
dev_err(dev, "reset: host wakeup not low!");
return -EPROTO;
}
/* flush queue */
serdev_device_write_flush(btdev->serdev);
/* init uart */
nokia_flow_control(btdev->serdev, false);
serdev_device_set_baudrate(btdev->serdev, INIT_BAUD_RATE);
gpiod_set_value_cansleep(btdev->reset, 0);
/* wait for cts */
err = serdev_device_wait_for_cts(btdev->serdev, true, 200);
if (err < 0) {
dev_err(dev, "CTS not received: %d", err);
return err;
}
nokia_flow_control(btdev->serdev, true);
return 0;
}
static bool tpd_detect(struct omap_dss_device *dssdev)
{
struct panel_drv_data *ddata = to_panel_data(dssdev);
return gpiod_get_value_cansleep(ddata->hpd_gpio);
}