From b03b4d7cdd8f18395494478634707c6f132080d6 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Thu, 8 Apr 2010 10:02:39 +0200 Subject: mfd: Ensure WM831x charger interrupts are acknowledged when suspending The charger interrupts on the WM831x are unconditionally a wake source for the system. If the power driver is not able to monitor them (for example, due to the IRQ line not having been wired up on the system) then any charger interrupt will prevent the system suspending for any meaningful amount of time since nothing will ack them. Avoid this issue by manually acknowledging these interrupts when we suspend the WM831x core device if they are masked. If software is actually using the interrupts then they will be unmasked and this change will have no effect. Signed-off-by: Mark Brown Signed-off-by: Samuel Ortiz --- drivers/mfd/wm831x-core.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) (limited to 'drivers/mfd') diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c index da00ca9e0c7..1a968f34d67 100644 --- a/drivers/mfd/wm831x-core.c +++ b/drivers/mfd/wm831x-core.c @@ -1494,6 +1494,7 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq) case WM8310: parent = WM8310; wm831x->num_gpio = 16; + wm831x->charger_irq_wake = 1; if (rev > 0) { wm831x->has_gpio_ena = 1; wm831x->has_cs_sts = 1; @@ -1505,6 +1506,7 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq) case WM8311: parent = WM8311; wm831x->num_gpio = 16; + wm831x->charger_irq_wake = 1; if (rev > 0) { wm831x->has_gpio_ena = 1; wm831x->has_cs_sts = 1; @@ -1516,6 +1518,7 @@ static int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq) case WM8312: parent = WM8312; wm831x->num_gpio = 16; + wm831x->charger_irq_wake = 1; if (rev > 0) { wm831x->has_gpio_ena = 1; wm831x->has_cs_sts = 1; @@ -1654,6 +1657,42 @@ static void wm831x_device_exit(struct wm831x *wm831x) kfree(wm831x); } +static int wm831x_device_suspend(struct wm831x *wm831x) +{ + int reg, mask; + + /* If the charger IRQs are a wake source then make sure we ack + * them even if they're not actively being used (eg, no power + * driver or no IRQ line wired up) then acknowledge the + * interrupts otherwise suspend won't last very long. + */ + if (wm831x->charger_irq_wake) { + reg = wm831x_reg_read(wm831x, WM831X_INTERRUPT_STATUS_2_MASK); + + mask = WM831X_CHG_BATT_HOT_EINT | + WM831X_CHG_BATT_COLD_EINT | + WM831X_CHG_BATT_FAIL_EINT | + WM831X_CHG_OV_EINT | WM831X_CHG_END_EINT | + WM831X_CHG_TO_EINT | WM831X_CHG_MODE_EINT | + WM831X_CHG_START_EINT; + + /* If any of the interrupts are masked read the statuses */ + if (reg & mask) + reg = wm831x_reg_read(wm831x, + WM831X_INTERRUPT_STATUS_2); + + if (reg & mask) { + dev_info(wm831x->dev, + "Acknowledging masked charger IRQs: %x\n", + reg & mask); + wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_2, + reg & mask); + } + } + + return 0; +} + static int wm831x_i2c_read_device(struct wm831x *wm831x, unsigned short reg, int bytes, void *dest) { @@ -1728,6 +1767,13 @@ static int wm831x_i2c_remove(struct i2c_client *i2c) return 0; } +static int wm831x_i2c_suspend(struct i2c_client *i2c, pm_message_t mesg) +{ + struct wm831x *wm831x = i2c_get_clientdata(i2c); + + return wm831x_device_suspend(wm831x); +} + static const struct i2c_device_id wm831x_i2c_id[] = { { "wm8310", WM8310 }, { "wm8311", WM8311 }, @@ -1745,6 +1791,7 @@ static struct i2c_driver wm831x_i2c_driver = { }, .probe = wm831x_i2c_probe, .remove = wm831x_i2c_remove, + .suspend = wm831x_i2c_suspend, .id_table = wm831x_i2c_id, }; -- cgit v1.2.3-70-g09d2