From 9ce9f7999741f342eeffd036ab09213a2fa93040 Mon Sep 17 00:00:00 2001 From: Thor Thayer Date: Mon, 13 Feb 2017 13:49:58 -0600 Subject: gpio: altera-a10sr: Set gpio_chip parent property Set the gpio_chip parent property since some recent functions such as devprop_gpiochip_set_names() can use it. Signed-off-by: Thor Thayer Signed-off-by: Linus Walleij --- drivers/gpio/gpio-altera-a10sr.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpio-altera-a10sr.c b/drivers/gpio/gpio-altera-a10sr.c index 9e1a138fed53..16a8951b2bed 100644 --- a/drivers/gpio/gpio-altera-a10sr.c +++ b/drivers/gpio/gpio-altera-a10sr.c @@ -96,7 +96,7 @@ static int altr_a10sr_gpio_probe(struct platform_device *pdev) gpio->regmap = a10sr->regmap; gpio->gp = altr_a10sr_gc; - + gpio->gp.parent = pdev->dev.parent; gpio->gp.of_node = pdev->dev.of_node; ret = devm_gpiochip_add_data(&pdev->dev, &gpio->gp, gpio); -- cgit v1.2.3 From fa6256db033067b57318decdc1c583512a1f8f68 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Wed, 15 Feb 2017 02:02:06 +0300 Subject: gpio: mockup: return -EFAULT if copy_from_user() fails copy_from_user() returns the number of bytes remaining to be copied but we want to return negative error codes on failue. Fixes: 9202ba2397d1 ("gpio: mockup: implement event injecting over debugfs") Signed-off-by: Dan Carpenter Acked-by: Bartosz Golaszewski Signed-off-by: Linus Walleij --- drivers/gpio/gpio-mockup.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c index 06dac72cb69c..d99338689213 100644 --- a/drivers/gpio/gpio-mockup.c +++ b/drivers/gpio/gpio-mockup.c @@ -197,7 +197,7 @@ static ssize_t gpio_mockup_event_write(struct file *file, struct seq_file *sfile; struct gpio_desc *desc; struct gpio_chip *gc; - int status, val; + int val; char buf; sfile = file->private_data; @@ -206,9 +206,8 @@ static ssize_t gpio_mockup_event_write(struct file *file, chip = priv->chip; gc = &chip->gc; - status = copy_from_user(&buf, usr_buf, 1); - if (status) - return status; + if (copy_from_user(&buf, usr_buf, 1)) + return -EFAULT; if (buf == '0') val = 0; -- cgit v1.2.3 From b115bebc07f282067eccc06fd5aa3060ab1426da Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Fri, 17 Feb 2017 16:13:44 +0100 Subject: gpio: xgene: mark PM functions as __maybe_unused When CONFIG_PM_SLEEP is disabled, we get a warning about unused functions: drivers/gpio/gpio-xgene.c:155:12: warning: 'xgene_gpio_resume' defined but not used [-Wunused-function] static int xgene_gpio_resume(struct device *dev) ^~~~~~~~~~~~~~~~~ drivers/gpio/gpio-xgene.c:142:12: warning: 'xgene_gpio_suspend' defined but not used [-Wunused-function] static int xgene_gpio_suspend(struct device *dev) The warnings are harmless and can be avoided by simplifying the code and marking the functions as __maybe_unused. Signed-off-by: Arnd Bergmann Signed-off-by: Linus Walleij --- drivers/gpio/gpio-xgene.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpio-xgene.c b/drivers/gpio/gpio-xgene.c index 40a8881c2ce8..f1c6ec17b90a 100644 --- a/drivers/gpio/gpio-xgene.c +++ b/drivers/gpio/gpio-xgene.c @@ -42,9 +42,7 @@ struct xgene_gpio { struct gpio_chip chip; void __iomem *base; spinlock_t lock; -#ifdef CONFIG_PM u32 set_dr_val[XGENE_MAX_GPIO_BANKS]; -#endif }; static int xgene_gpio_get(struct gpio_chip *gc, unsigned int offset) @@ -138,8 +136,7 @@ static int xgene_gpio_dir_out(struct gpio_chip *gc, return 0; } -#ifdef CONFIG_PM -static int xgene_gpio_suspend(struct device *dev) +static __maybe_unused int xgene_gpio_suspend(struct device *dev) { struct xgene_gpio *gpio = dev_get_drvdata(dev); unsigned long bank_offset; @@ -152,7 +149,7 @@ static int xgene_gpio_suspend(struct device *dev) return 0; } -static int xgene_gpio_resume(struct device *dev) +static __maybe_unused int xgene_gpio_resume(struct device *dev) { struct xgene_gpio *gpio = dev_get_drvdata(dev); unsigned long bank_offset; @@ -166,10 +163,6 @@ static int xgene_gpio_resume(struct device *dev) } static SIMPLE_DEV_PM_OPS(xgene_gpio_pm, xgene_gpio_suspend, xgene_gpio_resume); -#define XGENE_GPIO_PM_OPS (&xgene_gpio_pm) -#else -#define XGENE_GPIO_PM_OPS NULL -#endif static int xgene_gpio_probe(struct platform_device *pdev) { @@ -241,7 +234,7 @@ static struct platform_driver xgene_gpio_driver = { .name = "xgene-gpio", .of_match_table = xgene_gpio_of_match, .acpi_match_table = ACPI_PTR(xgene_gpio_acpi_match), - .pm = XGENE_GPIO_PM_OPS, + .pm = &xgene_gpio_pm, }, .probe = xgene_gpio_probe, }; -- cgit v1.2.3 From f759921cfbf4847319d197a6ed7c9534d593f8bc Mon Sep 17 00:00:00 2001 From: Phil Reid Date: Mon, 20 Feb 2017 09:41:45 +0800 Subject: gpio: altera: Use handle_level_irq when configured as a level_high When a threaded irq handler is chained attached to one of the gpio pins when configure for level irq the altera_gpio_irq_leveL_high_handler does not mask the interrupt while being handled by the chained irq. This resulting in the threaded irq not getting enough cycles to complete quickly enough before the irq was disabled as faulty. handle_level_irq should be used in this situation instead of handle_simple_irq. In gpiochip_irqchip_add set default handler to handle_bad_irq as per Documentation/gpio/driver.txt. Then set the correct handler in the set_type callback. Signed-off-by: Phil Reid Signed-off-by: Linus Walleij --- drivers/gpio/gpio-altera.c | 26 +++++++++++--------------- 1 file changed, 11 insertions(+), 15 deletions(-) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpio-altera.c b/drivers/gpio/gpio-altera.c index 5bddbd507ca9..3fe6a21e05a5 100644 --- a/drivers/gpio/gpio-altera.c +++ b/drivers/gpio/gpio-altera.c @@ -90,21 +90,18 @@ static int altera_gpio_irq_set_type(struct irq_data *d, altera_gc = gpiochip_get_data(irq_data_get_irq_chip_data(d)); - if (type == IRQ_TYPE_NONE) + if (type == IRQ_TYPE_NONE) { + irq_set_handler_locked(d, handle_bad_irq); return 0; - if (type == IRQ_TYPE_LEVEL_HIGH && - altera_gc->interrupt_trigger == IRQ_TYPE_LEVEL_HIGH) - return 0; - if (type == IRQ_TYPE_EDGE_RISING && - altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_RISING) - return 0; - if (type == IRQ_TYPE_EDGE_FALLING && - altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_FALLING) - return 0; - if (type == IRQ_TYPE_EDGE_BOTH && - altera_gc->interrupt_trigger == IRQ_TYPE_EDGE_BOTH) + } + if (type == altera_gc->interrupt_trigger) { + if (type == IRQ_TYPE_LEVEL_HIGH) + irq_set_handler_locked(d, handle_level_irq); + else + irq_set_handler_locked(d, handle_simple_irq); return 0; - + } + irq_set_handler_locked(d, handle_bad_irq); return -EINVAL; } @@ -230,7 +227,6 @@ static void altera_gpio_irq_edge_handler(struct irq_desc *desc) chained_irq_exit(chip, desc); } - static void altera_gpio_irq_leveL_high_handler(struct irq_desc *desc) { struct altera_gpio_chip *altera_gc; @@ -310,7 +306,7 @@ static int altera_gpio_probe(struct platform_device *pdev) altera_gc->interrupt_trigger = reg; ret = gpiochip_irqchip_add(&altera_gc->mmchip.gc, &altera_irq_chip, 0, - handle_simple_irq, IRQ_TYPE_NONE); + handle_bad_irq, IRQ_TYPE_NONE); if (ret) { dev_err(&pdev->dev, "could not add irqchip\n"); -- cgit v1.2.3 From 2cd29f2387be70de9feb4c9f8dbc7c0bd55748ce Mon Sep 17 00:00:00 2001 From: Robert Middleton Date: Wed, 15 Mar 2017 16:56:47 -0400 Subject: gpio:mcp23s08 Fixed missing interrupts When an interrupt occurs on an MCP23S08 chip, the INTF register will only contain one bit as causing the interrupt. If more than two pins change at the same time on the chip, this causes one of the pins to not be reported. This patch fixes the logic for checking if a pin has changed, so that multiple pins will always cause more than one change. Cc: stable@vger.kernel.org Signed-off-by: Robert Middleton Tested-by: Phil Reid Signed-off-by: Linus Walleij --- drivers/gpio/gpio-mcp23s08.c | 65 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 60 insertions(+), 5 deletions(-) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c index bdb692345428..2a57d024481d 100644 --- a/drivers/gpio/gpio-mcp23s08.c +++ b/drivers/gpio/gpio-mcp23s08.c @@ -270,8 +270,10 @@ mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value) static irqreturn_t mcp23s08_irq(int irq, void *data) { struct mcp23s08 *mcp = data; - int intcap, intf, i; + int intcap, intf, i, gpio, gpio_orig, intcap_mask; unsigned int child_irq; + bool intf_set, intcap_changed, gpio_bit_changed, + defval_changed, gpio_set; mutex_lock(&mcp->lock); if (mcp_read(mcp, MCP_INTF, &intf) < 0) { @@ -287,14 +289,67 @@ static irqreturn_t mcp23s08_irq(int irq, void *data) } mcp->cache[MCP_INTCAP] = intcap; + + /* This clears the interrupt(configurable on S18) */ + if (mcp_read(mcp, MCP_GPIO, &gpio) < 0) { + mutex_unlock(&mcp->lock); + return IRQ_HANDLED; + } + gpio_orig = mcp->cache[MCP_GPIO]; + mcp->cache[MCP_GPIO] = gpio; mutex_unlock(&mcp->lock); + if (mcp->cache[MCP_INTF] == 0) { + /* There is no interrupt pending */ + return IRQ_HANDLED; + } + + dev_dbg(mcp->chip.parent, + "intcap 0x%04X intf 0x%04X gpio_orig 0x%04X gpio 0x%04X\n", + intcap, intf, gpio_orig, gpio); for (i = 0; i < mcp->chip.ngpio; i++) { - if ((BIT(i) & mcp->cache[MCP_INTF]) && - ((BIT(i) & intcap & mcp->irq_rise) || - (mcp->irq_fall & ~intcap & BIT(i)) || - (BIT(i) & mcp->cache[MCP_INTCON]))) { + /* We must check all of the inputs on the chip, + * otherwise we may not notice a change on >=2 pins. + * + * On at least the mcp23s17, INTCAP is only updated + * one byte at a time(INTCAPA and INTCAPB are + * not written to at the same time - only on a per-bank + * basis). + * + * INTF only contains the single bit that caused the + * interrupt per-bank. On the mcp23s17, there is + * INTFA and INTFB. If two pins are changed on the A + * side at the same time, INTF will only have one bit + * set. If one pin on the A side and one pin on the B + * side are changed at the same time, INTF will have + * two bits set. Thus, INTF can't be the only check + * to see if the input has changed. + */ + + intf_set = BIT(i) & mcp->cache[MCP_INTF]; + if (i < 8 && intf_set) + intcap_mask = 0x00FF; + else if (i >= 8 && intf_set) + intcap_mask = 0xFF00; + else + intcap_mask = 0x00; + + intcap_changed = (intcap_mask & + (BIT(i) & mcp->cache[MCP_INTCAP])) != + (intcap_mask & (BIT(i) & gpio_orig)); + gpio_set = BIT(i) & mcp->cache[MCP_GPIO]; + gpio_bit_changed = (BIT(i) & gpio_orig) != + (BIT(i) & mcp->cache[MCP_GPIO]); + defval_changed = (BIT(i) & mcp->cache[MCP_INTCON]) && + ((BIT(i) & mcp->cache[MCP_GPIO]) != + (BIT(i) & mcp->cache[MCP_DEFVAL])); + + if (((gpio_bit_changed || intcap_changed) && + (BIT(i) & mcp->irq_rise) && gpio_set) || + ((gpio_bit_changed || intcap_changed) && + (BIT(i) & mcp->irq_fall) && !gpio_set) || + defval_changed) { child_irq = irq_find_mapping(mcp->chip.irqdomain, i); handle_nested_irq(child_irq); } -- cgit v1.2.3