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Date: Wed, 20 Oct 2010 14:20:33 +0100
From: "Hennerich, Michael" <Michael.Hennerich@...log.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Mike Frysinger <vapier@...too.org>
CC: "device-drivers-devel@...ckfin.uclinux.org"
<device-drivers-devel@...ckfin.uclinux.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Dmitry Torokhov <dtor@...l.ru>
Subject: RE: [PATCH v2] gpio: adp5588-gpio: support interrupt controller
Andrew Morton wrote on 2010-10-19:
> On Tue, 19 Oct 2010 16:37:48 -0400
> Mike Frysinger <vapier@...too.org> wrote:
>
>> From: Michael Hennerich <michael.hennerich@...log.com>
>>
>> This patch implements irq_chip functionality on ADP5588/5587 GPIO
>> expanders. Only level sensitive interrupts are supported.
>> Interrupts provided by this irq_chip must be requested using
>> request_threaded_irq().
>>
>> Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
>> Signed-off-by: Mike Frysinger <vapier@...too.org>
>> ---
>> v2
>> - update feedback from akpm
>
> The delta is below.
>
> Could someone please update drivers/input/keyboard/adp5588-keys.c to
> use the now-common symbols?
I'll send Dmitry an update once this patch hits his tree.
-Michael
> : + /* Configuration Register1 */
> : +#define ADP5588_AUTO_INC (1 << 7)
> : +#define ADP5588_GPIEM_CFG (1 << 6)
> : +#define ADP5588_INT_CFG (1 << 4)
> : +#define ADP5588_GPI_IEN (1 << 1)
> : +
> : +/* Interrupt Status Register */
> : +#define ADP5588_GPI_INT (1 << 1)
> : +#define ADP5588_KE_INT (1 << 0)
>
>
>
> drivers/gpio/adp5588-gpio.c | 79 ++++++++++++++++------------------
> include/linux/i2c/adp5588.h | 14 ++++++
> 2 files changed, 52 insertions(+), 41 deletions(-)
> diff -puN drivers/gpio/adp5588-gpio.c~gpio-adp5588-gpio-support-
> interrupt-controller-update drivers/gpio/adp5588-gpio.c ---
> a/drivers/gpio/adp5588-gpio.c~gpio-adp5588-gpio-support-interrupt-
> controller-update +++ a/drivers/gpio/adp5588-gpio.c @@ -18,37 +18,21 @@
>
> #include <linux/i2c/adp5588.h>
> - /* Configuration Register1 */
> -#define AUTO_INC (1 << 7)
> -#define GPIEM_CFG (1 << 6)
> -#define OVR_FLOW_M (1 << 5)
> -#define INT_CFG (1 << 4)
> -#define OVR_FLOW_IEN (1 << 3)
> -#define K_LCK_IM (1 << 2)
> -#define GPI_IEN (1 << 1)
> -#define KE_IEN (1 << 0)
> -
> -/* Interrupt Status Register */
> -#define GPI_INT (1 << 1)
> -#define KE_INT (1 << 0)
> -
> -#define DRV_NAME "adp5588-gpio"
> -#define MAXGPIO 18
> -#define ADP_BANK(offs) ((offs) >> 3)
> -#define ADP_BIT(offs) (1u << ((offs) & 0x7))
> +#define DRV_NAME "adp5588-gpio"
>
> /*
> * Early pre 4.0 Silicon required to delay readout by at least 25ms,
> * since the Event Counter Register updated 25ms after the interrupt
> * asserted.
> */
> -#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
> +#define WA_DELAYED_READOUT_REVID(rev) ((rev) < 4)
>
> struct adp5588_gpio {
> struct i2c_client *client;
> struct gpio_chip gpio_chip;
> struct mutex lock; /* protect cached dir, dat_out */
> - struct mutex irq_lock; /* P: IRQ */
> + /* protect serialized access to the interrupt controller bus */
> + struct mutex irq_lock;
> unsigned gpio_start; unsigned irq_base; uint8_t dat_out[3]; @@ -84,8
> +68,8 @@ static int adp5588_gpio_get_value(struct struct adp5588_gpio
> *dev = container_of(chip, struct adp5588_gpio, gpio_chip);
> - return !!(adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 +
> ADP_BANK(off)) - & ADP_BIT(off)); + return
> !!(adp5588_gpio_read(dev->client, + GPIO_DAT_STAT1 +
> ADP5588_BANK(off)) & ADP5588_BIT(off));
> }
>
> static void adp5588_gpio_set_value(struct gpio_chip *chip, @@ -95,8
> +79,8 @@ static void adp5588_gpio_set_value(struc struct adp5588_gpio
> *dev = container_of(chip, struct adp5588_gpio, gpio_chip);
> - bank = ADP_BANK(off);
> - bit = ADP_BIT(off);
> + bank = ADP5588_BANK(off);
> + bit = ADP5588_BIT(off);
>
> mutex_lock(&dev->lock); if (val) @@ -116,10 +100,10 @@ static int
> adp5588_gpio_direction_input( struct adp5588_gpio *dev =
> container_of(chip, struct adp5588_gpio, gpio_chip);
> - bank = ADP_BANK(off);
> + bank = ADP5588_BANK(off);
>
> mutex_lock(&dev->lock);
> - dev->dir[bank] &= ~ADP_BIT(off);
> + dev->dir[bank] &= ~ADP5588_BIT(off);
> ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev-
> dir[bank]);
> mutex_unlock(&dev->lock);
> @@ -134,8 +118,8 @@ static int adp5588_gpio_direction_output
> struct adp5588_gpio *dev =
> container_of(chip, struct adp5588_gpio, gpio_chip);
> - bank = ADP_BANK(off);
> - bit = ADP_BIT(off);
> + bank = ADP5588_BANK(off);
> + bit = ADP5588_BIT(off);
>
> mutex_lock(&dev->lock); dev->dir[bank] |= bit; @@ -168,12 +152,20 @@
> static void adp5588_irq_bus_lock(unsigne mutex_lock(&dev->irq_lock); }
> + /*
> + * genirq core code can issue chip->mask/unmask from atomic context.
> + * This doesn't work for slow busses where an access needs to sleep.
> + * bus_sync_unlock() is therefore called outside the atomic context,
> + * syncs the current irq mask state with the slow external
> + controller
> + * and unlocks the bus.
> + */
> +
> static void adp5588_irq_bus_sync_unlock(unsigned int irq) {
> struct adp5588_gpio *dev = get_irq_chip_data(irq);
> int i;
> - for (i = 0; i <= ADP_BANK(MAXGPIO); i++)
> + for (i = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++)
> if (dev->int_en[i] ^ dev->irq_mask[i]) { dev->int_en[i] =
> dev->irq_mask[i]; adp5588_gpio_write(dev->client, GPIO_INT_EN1 + i,
> @@ -188,7 +180,7 @@ static void adp5588_irq_mask(unsigned in struct
> adp5588_gpio *dev = get_irq_chip_data(irq); unsigned gpio = irq -
> dev->irq_base;
> - dev->irq_mask[ADP_BANK(gpio)] &= ~ADP_BIT(gpio);
> + dev->irq_mask[ADP5588_BANK(gpio)] &= ~ADP5588_BIT(gpio);
> }
>
> static void adp5588_irq_unmask(unsigned int irq) @@ -196,7 +188,7 @@
> static void adp5588_irq_unmask(unsigned struct adp5588_gpio *dev =
> get_irq_chip_data(irq); unsigned gpio = irq - dev->irq_base;
> - dev->irq_mask[ADP_BANK(gpio)] |= ADP_BIT(gpio);
> + dev->irq_mask[ADP5588_BANK(gpio)] |= ADP5588_BIT(gpio);
> }
>
> static int adp5588_irq_set_type(unsigned int irq, unsigned int type) @@
> -211,8 +203,8 @@ static int adp5588_irq_set_type(unsigned return
> -EINVAL; }
> - bank = ADP_BANK(gpio);
> - bit = ADP_BIT(gpio);
> + bank = ADP5588_BANK(gpio);
> + bit = ADP5588_BIT(gpio);
>
> if (type & IRQ_TYPE_LEVEL_HIGH) dev->int_lvl[bank] |= bit; @@ -221,8
> +213,6 @@ static int adp5588_irq_set_type(unsigned else return
> -EINVAL;
> - might_sleep();
> -
> adp5588_gpio_direction_input(&dev->gpio_chip, gpio);
> adp5588_gpio_write(dev->client, GPIO_INT_LVL1 + bank,
> dev->int_lvl[bank]); @@ -256,12 +246,13 @@ static irqreturn_t
> adp5588_irq_handler(i int ret; status =
> adp5588_gpio_read(dev->client, INT_STAT);
> - if (status & GPI_INT) {
> + if (status & ADP5588_GPI_INT) {
> ret = adp5588_gpio_read_intstat(dev->client, dev-
> irq_stat);
> if (ret < 0)
> memset(dev->irq_stat, 0, ARRAY_SIZE(dev->irq_stat));
> - for (bank = 0; bank <= ADP_BANK(MAXGPIO); bank++, bit = 0)
> {
> + for (bank = 0; bank <= ADP5588_BANK(ADP5588_MAXGPIO);
> + bank++, bit = 0) {
> pending = dev->irq_stat[bank] & dev->irq_mask[bank];
>
> while (pending) { @@ -288,7 +279,7 @@ static int
> adp5588_irq_setup(struct adp5 unsigned gpio; int ret;
> - adp5588_gpio_write(client, CFG, AUTO_INC);
> + adp5588_gpio_write(client, CFG, ADP5588_AUTO_INC);
> adp5588_gpio_write(client, INT_STAT, -1); /* status is W1C */
> adp5588_gpio_read_intstat(client, dev->irq_stat); /* read to clear
> */
>
> @@ -302,6 +293,10 @@ static int adp5588_irq_setup(struct adp5
> handle_level_irq);
> set_irq_nested_thread(irq, 1);
> #ifdef CONFIG_ARM
> + /*
> + * ARM needs us to explicitly flag the IRQ as VALID,
> + * once we do so, it will also set the noprobe.
> + */
> set_irq_flags(irq, IRQF_VALID); #else set_irq_noprobe(irq); @@
> -320,7 +315,8 @@ static int adp5588_irq_setup(struct adp5 }
>
> dev->gpio_chip.to_irq = adp5588_gpio_to_irq;
> - adp5588_gpio_write(client, CFG, AUTO_INC | INT_CFG | GPI_INT);
> + adp5588_gpio_write(client, CFG,
> + ADP5588_AUTO_INC | ADP5588_INT_CFG | ADP5588_GPI_INT);
>
> return 0;
> @@ -328,6 +324,7 @@ out:
> dev->irq_base = 0; return ret; } + static void
> adp5588_irq_teardown(struct adp5588_gpio *dev) { if (dev->irq_base)
> @@ -383,7 +380,7 @@ static int __devinit adp5588_gpio_probe(
> gc->can_sleep = 1;
>
> gc->base = pdata->gpio_start;
> - gc->ngpio = MAXGPIO;
> + gc->ngpio = ADP5588_MAXGPIO;
> gc->label = client->name;
> gc->owner = THIS_MODULE;
> @@ -395,7 +392,7 @@ static int __devinit adp5588_gpio_probe(
>
> revid = ret & ADP5588_DEVICE_ID_MASK;
> - for (i = 0, ret = 0; i <= ADP_BANK(MAXGPIO); i++) {
> + for (i = 0, ret = 0; i <= ADP5588_BANK(ADP5588_MAXGPIO); i++) {
> dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i);
> dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i);
> ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0); diff - puN
> include/linux/i2c/adp5588.h~gpio-adp5588-gpio-support-interrupt-
> controller-update include/linux/i2c/adp5588.h ---
> a/include/linux/i2c/adp5588.h~gpio-adp5588-gpio-support-interrupt-
> controller-update +++ a/include/linux/i2c/adp5588.h @@ -74,6 +74,20 @@
>
> #define ADP5588_DEVICE_ID_MASK 0xF
> + /* Configuration Register1 */
> +#define ADP5588_AUTO_INC (1 << 7)
> +#define ADP5588_GPIEM_CFG (1 << 6)
> +#define ADP5588_INT_CFG (1 << 4)
> +#define ADP5588_GPI_IEN (1 << 1)
> +
> +/* Interrupt Status Register */
> +#define ADP5588_GPI_INT (1 << 1)
> +#define ADP5588_KE_INT (1 << 0)
> +
> +#define ADP5588_MAXGPIO 18
> +#define ADP5588_BANK(offs) ((offs) >> 3)
> +#define ADP5588_BIT(offs) (1u << ((offs) & 0x7))
> +
> /* Put one of these structures in i2c_board_info platform_data */
>
> #define ADP5588_KEYMAPSIZE 80
> _
Greetings,
Michael
Analog Devices GmbH Wilhelm-Wagenfeld-Str. 6 80807 Muenchen
Sitz der Gesellschaft Muenchen, Registergericht Muenchen HRB 4036 Geschaeftsfuehrer Thomas Wessel, William A. Martin, Margaret Seif
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