pinctrl: abx500: fix abx500_gpio_dbg_show_one() to show pull up/down

- 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>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 70 insertions, 16 deletions

diff --git a/drivers/pinctrl/pinctrl-abx500.c b/drivers/pinctrl/pinctrl-abx500.c
index 363712bad7ef..378ed3b850e7 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);
                 }