From f92e8f8144243a3651b2e350b706ea2d04931f8c Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 17 Feb 2010 18:45:25 +0000 Subject: [PATCH] mfd: Add WM831x revision B support Revision B of the WM831x devices changes the sense of the tristate bit for GPIO configuration, inverting it to become an enable instead. Take account of this in the gpiolib driver. A current sink regulation status bit has also been added in revision B, add a flag indicating if it's present but don't use it yet. This revision also adds an interrupt on key up for the ON pin event which the existing code is able to take advantage of. Signed-off-by: Mark Brown Signed-off-by: Samuel Ortiz --- drivers/gpio/wm831x-gpio.c | 21 ++++++++++++++++----- drivers/mfd/wm831x-core.c | 15 +++++++++++++++ include/linux/mfd/wm831x/core.h | 4 ++++ include/linux/mfd/wm831x/gpio.h | 4 ++++ 4 files changed, 39 insertions(+), 5 deletions(-) diff --git a/drivers/gpio/wm831x-gpio.c b/drivers/gpio/wm831x-gpio.c index 2554180534a1..5b8dc098d80f 100644 --- a/drivers/gpio/wm831x-gpio.c +++ b/drivers/gpio/wm831x-gpio.c @@ -38,10 +38,13 @@ static int wm831x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) { struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); struct wm831x *wm831x = wm831x_gpio->wm831x; + int val = WM831X_GPN_DIR; + + if (wm831x->has_gpio_ena) + val |= WM831X_GPN_TRI; return wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset, - WM831X_GPN_DIR | WM831X_GPN_TRI, - WM831X_GPN_DIR); + WM831X_GPN_DIR | WM831X_GPN_TRI, val); } static int wm831x_gpio_get(struct gpio_chip *chip, unsigned offset) @@ -74,10 +77,14 @@ static int wm831x_gpio_direction_out(struct gpio_chip *chip, { struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); struct wm831x *wm831x = wm831x_gpio->wm831x; + int val = 0; int ret; + if (wm831x->has_gpio_ena) + val |= WM831X_GPN_TRI; + ret = wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + offset, - WM831X_GPN_DIR | WM831X_GPN_TRI, 0); + WM831X_GPN_DIR | WM831X_GPN_TRI, val); if (ret < 0) return ret; @@ -103,7 +110,7 @@ static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) { struct wm831x_gpio *wm831x_gpio = to_wm831x_gpio(chip); struct wm831x *wm831x = wm831x_gpio->wm831x; - int i; + int i, tristated; for (i = 0; i < chip->ngpio; i++) { int gpio = i + chip->base; @@ -170,6 +177,10 @@ static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) break; } + tristated = reg & WM831X_GPN_TRI; + if (wm831x->has_gpio_ena) + tristated = !tristated; + seq_printf(s, " %s %s %s %s%s\n" " %s%s (0x%4x)\n", reg & WM831X_GPN_DIR ? "in" : "out", @@ -178,7 +189,7 @@ static void wm831x_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) powerdomain, reg & WM831X_GPN_POL ? "" : " inverted", reg & WM831X_GPN_OD ? "open-drain" : "CMOS", - reg & WM831X_GPN_TRI ? " tristated" : "", + tristated ? " tristated" : "", reg); } } diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c index 4b2021af1d96..c428d9f918fc 100644 --- a/drivers/mfd/wm831x-core.c +++ b/drivers/mfd/wm831x-core.c @@ -1449,18 +1449,33 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq) case WM8310: parent = WM8310; wm831x->num_gpio = 16; + if (rev > 0) { + wm831x->has_gpio_ena = 1; + wm831x->has_cs_sts = 1; + } + dev_info(wm831x->dev, "WM8310 revision %c\n", 'A' + rev); break; case WM8311: parent = WM8311; wm831x->num_gpio = 16; + if (rev > 0) { + wm831x->has_gpio_ena = 1; + wm831x->has_cs_sts = 1; + } + dev_info(wm831x->dev, "WM8311 revision %c\n", 'A' + rev); break; case WM8312: parent = WM8312; wm831x->num_gpio = 16; + if (rev > 0) { + wm831x->has_gpio_ena = 1; + wm831x->has_cs_sts = 1; + } + dev_info(wm831x->dev, "WM8312 revision %c\n", 'A' + rev); break; diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h index 5184b79c700b..53580b592bc9 100644 --- a/include/linux/mfd/wm831x/core.h +++ b/include/linux/mfd/wm831x/core.h @@ -254,6 +254,10 @@ struct wm831x { int irq_masks_cur[WM831X_NUM_IRQ_REGS]; /* Currently active value */ int irq_masks_cache[WM831X_NUM_IRQ_REGS]; /* Cached hardware value */ + /* Chip revision based flags */ + unsigned has_gpio_ena:1; /* Has GPIO enable bit */ + unsigned has_cs_sts:1; /* Has current sink status bit */ + int num_gpio; struct mutex auxadc_lock; diff --git a/include/linux/mfd/wm831x/gpio.h b/include/linux/mfd/wm831x/gpio.h index 2835614af0e3..9b163c58865f 100644 --- a/include/linux/mfd/wm831x/gpio.h +++ b/include/linux/mfd/wm831x/gpio.h @@ -41,6 +41,10 @@ #define WM831X_GPN_OD_MASK 0x0200 /* GPN_OD */ #define WM831X_GPN_OD_SHIFT 9 /* GPN_OD */ #define WM831X_GPN_OD_WIDTH 1 /* GPN_OD */ +#define WM831X_GPN_ENA 0x0080 /* GPN_ENA */ +#define WM831X_GPN_ENA_MASK 0x0080 /* GPN_ENA */ +#define WM831X_GPN_ENA_SHIFT 7 /* GPN_ENA */ +#define WM831X_GPN_ENA_WIDTH 1 /* GPN_ENA */ #define WM831X_GPN_TRI 0x0080 /* GPN_TRI */ #define WM831X_GPN_TRI_MASK 0x0080 /* GPN_TRI */ #define WM831X_GPN_TRI_SHIFT 7 /* GPN_TRI */ -- 2.20.1