* [PATCH 2/3] pinctrl: abx500: allow to set pull up
2013-05-24 12:06 [PATCH 0/3] pinctrl: abx500: Fix pull up/down feature patrice.chotard.st
2013-05-24 12:06 ` [PATCH 1/3] pinctrl: abx500: fix abx500_config_pull_updown patrice.chotard.st
@ 2013-05-24 12:06 ` patrice.chotard.st
2013-05-24 12:06 ` [PATCH 3/3] pinctrl: abx500: fix abx500_gpio_dbg_show_one() to show pull up/down patrice.chotard.st
2013-05-28 7:06 ` [PATCH 0/3] pinctrl: abx500: Fix pull up/down feature Linus Walleij
3 siblings, 0 replies; 6+ messages in thread
From: patrice.chotard.st @ 2013-05-24 12:06 UTC (permalink / raw)
To: linux-kernel, Linus Walleij
Cc: Olivier Clergeaud, Lee Jones, Fabio Baltieri, Patrice Chotard
From: Patrice Chotard <patrice.chotard@st.com>
On ABx500 chip family, all pins support only pull down except for
AB8540 which supports pull up/down on some pins.
Rework abx500_pin_config_set to be able to set pull up on
pins which support this feature.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
---
drivers/pinctrl/pinctrl-abx500.c | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/drivers/pinctrl/pinctrl-abx500.c b/drivers/pinctrl/pinctrl-abx500.c
index 7d2e8d7..7f2202a 100644
--- a/drivers/pinctrl/pinctrl-abx500.c
+++ b/drivers/pinctrl/pinctrl-abx500.c
@@ -725,7 +725,7 @@ static int abx500_pin_config_set(struct pinctrl_dev *pctldev,
struct pullud *pullud = pct->soc->pullud;
struct gpio_chip *chip = &pct->chip;
unsigned offset;
- int ret;
+ int ret = 0;
enum pin_config_param param = pinconf_to_config_param(config);
enum pin_config_param argument = pinconf_to_config_argument(config);
@@ -763,6 +763,28 @@ static int abx500_pin_config_set(struct pinctrl_dev *pctldev,
offset, argument ? 0 : 1);
break;
+ case PIN_CONFIG_BIAS_PULL_UP:
+ /*
+ * if argument = 1 set the pull up
+ * else clear the pull up
+ */
+ ret = abx500_gpio_direction_input(chip, offset);
+ /*
+ * Some chips only support pull down, while some actually
+ * support both pull up and pull down. Such chips have
+ * a "pullud" range specified for the pins that support
+ * both features. If the pin is not within that range, do
+ * nothing
+ */
+ if (pullud &&
+ pin >= pullud->first_pin &&
+ pin <= pullud->last_pin) {
+ ret = abx500_config_pull_updown(pct,
+ pin,
+ argument ? ABX500_GPIO_PULL_UP : ABX500_GPIO_PULL_NONE);
+ }
+ break;
+
case PIN_CONFIG_OUTPUT:
ret = abx500_gpio_direction_output(chip, offset, argument);
--
1.7.10
^ permalink raw reply related [flat|nested] 6+ messages in thread* [PATCH 3/3] pinctrl: abx500: fix abx500_gpio_dbg_show_one() to show pull up/down
2013-05-24 12:06 [PATCH 0/3] pinctrl: abx500: Fix pull up/down feature patrice.chotard.st
2013-05-24 12:06 ` [PATCH 1/3] pinctrl: abx500: fix abx500_config_pull_updown patrice.chotard.st
2013-05-24 12:06 ` [PATCH 2/3] pinctrl: abx500: allow to set pull up patrice.chotard.st
@ 2013-05-24 12:06 ` patrice.chotard.st
2013-05-28 7:06 ` [PATCH 0/3] pinctrl: abx500: Fix pull up/down feature Linus Walleij
3 siblings, 0 replies; 6+ messages in thread
From: patrice.chotard.st @ 2013-05-24 12:06 UTC (permalink / raw)
To: linux-kernel, Linus Walleij
Cc: Olivier Clergeaud, Lee Jones, Fabio Baltieri, Patrice Chotard
From: Patrice Chotard <patrice.chotard@st.com>
_ rework abx500_gpio_dbg_show_one() to take in account pull up/down
feature available on AB8540 only.
_ add abx500_get_pull_updown() needed by abx500_gpio_dbg_show_one()
_ rename abx500_config_pull_updown() to abx500_set_pull_updown()
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
---
drivers/pinctrl/pinctrl-abx500.c | 86 +++++++++++++++++++++++++++++++-------
1 file changed, 70 insertions(+), 16 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-abx500.c b/drivers/pinctrl/pinctrl-abx500.c
index 7f2202a..0157fd3 100644
--- a/drivers/pinctrl/pinctrl-abx500.c
+++ b/drivers/pinctrl/pinctrl-abx500.c
@@ -181,10 +181,11 @@ static void abx500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
dev_err(pct->dev, "%s write failed\n", __func__);
}
-static int abx500_config_pull_updown(struct abx500_pinctrl *pct,
- int offset, enum abx500_gpio_pull_updown val)
+static int abx500_get_pull_updown(struct abx500_pinctrl *pct, int offset,
+ enum abx500_gpio_pull_updown *pull_updown)
{
u8 pos;
+ u8 val;
int ret;
struct pullud *pullud;
@@ -203,6 +204,40 @@ static int abx500_config_pull_updown(struct abx500_pinctrl *pct,
goto out;
}
+ ret = abx500_get_register_interruptible(pct->dev,
+ AB8500_MISC, AB8540_GPIO_PULL_UPDOWN_REG, &val);
+
+ pos = (offset - pullud->first_pin) << 1;
+ *pull_updown = (val >> pos) & AB8540_GPIO_PULL_UPDOWN_MASK;
+
+out:
+ if (ret < 0)
+ dev_err(pct->dev, "%s failed (%d)\n", __func__, ret);
+
+ return ret;
+}
+
+static int abx500_set_pull_updown(struct abx500_pinctrl *pct,
+ int offset, enum abx500_gpio_pull_updown val)
+{
+ u8 pos;
+ int ret;
+ struct pullud *pullud;
+
+ if (!pct->soc->pullud) {
+ dev_err(pct->dev, "%s AB chip doesn't support pull up/down feature",
+ __func__);
+ ret = -EPERM;
+ goto out;
+ }
+
+ pullud = pct->soc->pullud;
+
+ if ((offset < pullud->first_pin)
+ || (offset > pullud->last_pin)) {
+ ret = -EINVAL;
+ goto out;
+ }
pos = (offset - pullud->first_pin) << 1;
ret = abx500_mask_and_set_register_interruptible(pct->dev,
@@ -238,7 +273,7 @@ static int abx500_gpio_direction_output(struct gpio_chip *chip,
/* if supported, disable both pull down and pull up */
gpio = offset + 1;
if (pullud && gpio >= pullud->first_pin && gpio <= pullud->last_pin) {
- ret = abx500_config_pull_updown(pct,
+ ret = abx500_set_pull_updown(pct,
gpio,
ABX500_GPIO_PULL_NONE);
if (ret < 0)
@@ -462,11 +497,14 @@ static void abx500_gpio_dbg_show_one(struct seq_file *s,
struct gpio_chip *chip,
unsigned offset, unsigned gpio)
{
+ struct abx500_pinctrl *pct = pinctrl_dev_get_drvdata(pctldev);
+ struct pullud *pullud = pct->soc->pullud;
const char *label = gpiochip_is_requested(chip, offset - 1);
u8 gpio_offset = offset - 1;
int mode = -1;
bool is_out;
- bool pull;
+ bool pd;
+ enum abx500_gpio_pull_updown pud;
const char *modes[] = {
[ABX500_DEFAULT] = "default",
@@ -475,21 +513,37 @@ static void abx500_gpio_dbg_show_one(struct seq_file *s,
[ABX500_ALT_C] = "altC",
};
+ const char *pull_up_down[] = {
+ [ABX500_GPIO_PULL_DOWN] = "pull down",
+ [ABX500_GPIO_PULL_NONE] = "pull none",
+ [ABX500_GPIO_PULL_NONE + 1] = "pull none",
+ [ABX500_GPIO_PULL_UP] = "pull up",
+ };
+
abx500_gpio_get_bit(chip, AB8500_GPIO_DIR1_REG, gpio_offset, &is_out);
- abx500_gpio_get_bit(chip, AB8500_GPIO_PUD1_REG, gpio_offset, &pull);
+
+ seq_printf(s, " gpio-%-3d (%-20.20s) %-3s",
+ gpio, label ?: "(none)",
+ is_out ? "out" : "in ");
+
+ if (!is_out) {
+ if (pullud &&
+ (offset >= pullud->first_pin) &&
+ (offset <= pullud->last_pin)) {
+ abx500_get_pull_updown(pct, offset, &pud);
+ seq_printf(s, " %-9s", pull_up_down[pud]);
+ } else {
+ abx500_gpio_get_bit(chip, AB8500_GPIO_PUD1_REG,
+ gpio_offset, &pd);
+ seq_printf(s, " %-9s", pull_up_down[pd]);
+ }
+ } else
+ seq_printf(s, " %-9s", chip->get(chip, offset) ? "hi" : "lo");
if (pctldev)
mode = abx500_get_mode(pctldev, chip, offset);
- seq_printf(s, " gpio-%-3d (%-20.20s) %-3s %-9s %s",
- gpio, label ?: "(none)",
- is_out ? "out" : "in ",
- is_out ?
- (chip->get
- ? (chip->get(chip, offset) ? "hi" : "lo")
- : "? ")
- : (pull ? "pull up" : "pull down"),
- (mode < 0) ? "unknown" : modes[mode]);
+ seq_printf(s, " %s", (mode < 0) ? "unknown" : modes[mode]);
}
static void abx500_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
@@ -754,7 +808,7 @@ static int abx500_pin_config_set(struct pinctrl_dev *pctldev,
if (pullud &&
pin >= pullud->first_pin &&
pin <= pullud->last_pin)
- ret = abx500_config_pull_updown(pct,
+ ret = abx500_set_pull_updown(pct,
pin,
argument ? ABX500_GPIO_PULL_DOWN : ABX500_GPIO_PULL_NONE);
else
@@ -779,7 +833,7 @@ static int abx500_pin_config_set(struct pinctrl_dev *pctldev,
if (pullud &&
pin >= pullud->first_pin &&
pin <= pullud->last_pin) {
- ret = abx500_config_pull_updown(pct,
+ ret = abx500_set_pull_updown(pct,
pin,
argument ? ABX500_GPIO_PULL_UP : ABX500_GPIO_PULL_NONE);
}
--
1.7.10
^ permalink raw reply related [flat|nested] 6+ messages in thread