alistair23-linux/drivers/gpio/gpio-tc3589x.c
Linus Torvalds 061ad5038c Bulk GPIO changes for the v4.10 kernel cycle:
Core changes:
 
 - Simplify threaded interrupt handling: instead of passing
   numbed parameters to gpiochip_irqchip_add_chained() we
   create a new call: gpiochip_irqchip_add_nested() so the two
   types are clearly semantically different. Also make sure
   that all nested chips call gpiochip_set_nested_irqchip()
   which is necessary for IRQ resend to work properly if
   it happens.
 
 - Return error on seek operations for the chardev.
 
 - Clamp values set as part of gpio[d]_direction_output() so
   that anything != 0 will be send down to the driver as "1"
   not the value passed in.
 
 - ACPI can now support naming of GPIO lines, hogs and holes
   in the GPIO lists.
 
 New drivers:
 
 - The SX150x driver was deemed unfit for the GPIO subsystem
   and was moved over to a combined GPIO+pinctrl driver in the
   pinctrl subsystem.
 
 New features:
 
 - Various cleanups to various drivers.
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Merge tag 'gpio-v4.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Luinus Walleij:
 "Bulk GPIO changes for the v4.10 kernel cycle:

  Core changes:

   - Simplify threaded interrupt handling: instead of passing numbed
     parameters to gpiochip_irqchip_add_chained() we create a new call:
     gpiochip_irqchip_add_nested() so the two types are clearly
     semantically different. Also make sure that all nested chips call
     gpiochip_set_nested_irqchip() which is necessary for IRQ resend to
     work properly if it happens.

   - Return error on seek operations for the chardev.

   - Clamp values set as part of gpio[d]_direction_output() so that
     anything != 0 will be send down to the driver as "1" not the value
     passed in.

   - ACPI can now support naming of GPIO lines, hogs and holes in the
     GPIO lists.

  New drivers:

   - The SX150x driver was deemed unfit for the GPIO subsystem and was
     moved over to a combined GPIO+pinctrl driver in the pinctrl
     subsystem.

  New features:

   - Various cleanups to various drivers"

* tag 'gpio-v4.10-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (49 commits)
  gpio: merrifield: Implement gpio_get_direction callback
  gpio: merrifield: Add support for hardware debouncer
  gpio: chardev: Return error for seek operations
  gpio: arizona: Tidy up probe error path
  gpio: arizona: Remove pointless set of platform drvdata
  gpio: pl061: delete platform data handling
  gpio: pl061: move platform data into driver
  gpio: pl061: rename variable from chip to pl061
  gpio: pl061: rename state container struct
  gpio: pl061: use local state for parent IRQ storage
  gpio: set explicit nesting on drivers
  gpio: simplify adding threaded interrupts
  gpio: vf610: use builtin_platform_driver
  gpio: axp209: use correct register for GPIO input status
  gpio: stmpe: fix interrupt handling bug
  gpio: em: depnd on ARCH_SHMOBILE
  gpio: zx: depend on ARCH_ZX
  gpio: x86: update config dependencies for x86 specific hardware
  gpio: mb86s7x: use builtin_platform_driver
  gpio: etraxfs: use builtin_platform_driver
  ...
2016-12-13 07:54:57 -08:00

370 lines
9.6 KiB
C

/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License, version 2
* Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
* Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
*/
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gpio/driver.h>
#include <linux/of.h>
#include <linux/interrupt.h>
#include <linux/mfd/tc3589x.h>
#include <linux/bitops.h>
/*
* These registers are modified under the irq bus lock and cached to avoid
* unnecessary writes in bus_sync_unlock.
*/
enum { REG_IBE, REG_IEV, REG_IS, REG_IE };
#define CACHE_NR_REGS 4
#define CACHE_NR_BANKS 3
struct tc3589x_gpio {
struct gpio_chip chip;
struct tc3589x *tc3589x;
struct device *dev;
struct mutex irq_lock;
/* Caches of interrupt control registers for bus_lock */
u8 regs[CACHE_NR_REGS][CACHE_NR_BANKS];
u8 oldregs[CACHE_NR_REGS][CACHE_NR_BANKS];
};
static int tc3589x_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
u8 mask = BIT(offset % 8);
int ret;
ret = tc3589x_reg_read(tc3589x, reg);
if (ret < 0)
return ret;
return !!(ret & mask);
}
static void tc3589x_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
{
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODATA0 + (offset / 8) * 2;
unsigned int pos = offset % 8;
u8 data[] = {val ? BIT(pos) : 0, BIT(pos)};
tc3589x_block_write(tc3589x, reg, ARRAY_SIZE(data), data);
}
static int tc3589x_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int val)
{
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODIR0 + offset / 8;
unsigned int pos = offset % 8;
tc3589x_gpio_set(chip, offset, val);
return tc3589x_set_bits(tc3589x, reg, BIT(pos), BIT(pos));
}
static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODIR0 + offset / 8;
unsigned int pos = offset % 8;
return tc3589x_set_bits(tc3589x, reg, BIT(pos), 0);
}
static int tc3589x_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 reg = TC3589x_GPIODIR0 + offset / 8;
unsigned int pos = offset % 8;
int ret;
ret = tc3589x_reg_read(tc3589x, reg);
if (ret < 0)
return ret;
return !(ret & BIT(pos));
}
static int tc3589x_gpio_set_single_ended(struct gpio_chip *chip,
unsigned int offset,
enum single_ended_mode mode)
{
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(chip);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
/*
* These registers are alterated at each second address
* ODM bit 0 = drive to GND or Hi-Z (open drain)
* ODM bit 1 = drive to VDD or Hi-Z (open source)
*/
u8 odmreg = TC3589x_GPIOODM0 + (offset / 8) * 2;
u8 odereg = TC3589x_GPIOODE0 + (offset / 8) * 2;
unsigned int pos = offset % 8;
int ret;
switch(mode) {
case LINE_MODE_OPEN_DRAIN:
/* Set open drain mode */
ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), 0);
if (ret)
return ret;
/* Enable open drain/source mode */
return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
case LINE_MODE_OPEN_SOURCE:
/* Set open source mode */
ret = tc3589x_set_bits(tc3589x, odmreg, BIT(pos), BIT(pos));
if (ret)
return ret;
/* Enable open drain/source mode */
return tc3589x_set_bits(tc3589x, odereg, BIT(pos), BIT(pos));
case LINE_MODE_PUSH_PULL:
/* Disable open drain/source mode */
return tc3589x_set_bits(tc3589x, odereg, BIT(pos), 0);
default:
break;
}
return -ENOTSUPP;
}
static const struct gpio_chip template_chip = {
.label = "tc3589x",
.owner = THIS_MODULE,
.get = tc3589x_gpio_get,
.set = tc3589x_gpio_set,
.direction_output = tc3589x_gpio_direction_output,
.direction_input = tc3589x_gpio_direction_input,
.get_direction = tc3589x_gpio_get_direction,
.set_single_ended = tc3589x_gpio_set_single_ended,
.can_sleep = true,
};
static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
int offset = d->hwirq;
int regoffset = offset / 8;
int mask = BIT(offset % 8);
if (type == IRQ_TYPE_EDGE_BOTH) {
tc3589x_gpio->regs[REG_IBE][regoffset] |= mask;
return 0;
}
tc3589x_gpio->regs[REG_IBE][regoffset] &= ~mask;
if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_LEVEL_HIGH)
tc3589x_gpio->regs[REG_IS][regoffset] |= mask;
else
tc3589x_gpio->regs[REG_IS][regoffset] &= ~mask;
if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH)
tc3589x_gpio->regs[REG_IEV][regoffset] |= mask;
else
tc3589x_gpio->regs[REG_IEV][regoffset] &= ~mask;
return 0;
}
static void tc3589x_gpio_irq_lock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
mutex_lock(&tc3589x_gpio->irq_lock);
}
static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
static const u8 regmap[] = {
[REG_IBE] = TC3589x_GPIOIBE0,
[REG_IEV] = TC3589x_GPIOIEV0,
[REG_IS] = TC3589x_GPIOIS0,
[REG_IE] = TC3589x_GPIOIE0,
};
int i, j;
for (i = 0; i < CACHE_NR_REGS; i++) {
for (j = 0; j < CACHE_NR_BANKS; j++) {
u8 old = tc3589x_gpio->oldregs[i][j];
u8 new = tc3589x_gpio->regs[i][j];
if (new == old)
continue;
tc3589x_gpio->oldregs[i][j] = new;
tc3589x_reg_write(tc3589x, regmap[i] + j * 8, new);
}
}
mutex_unlock(&tc3589x_gpio->irq_lock);
}
static void tc3589x_gpio_irq_mask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
int offset = d->hwirq;
int regoffset = offset / 8;
int mask = BIT(offset % 8);
tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask;
}
static void tc3589x_gpio_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct tc3589x_gpio *tc3589x_gpio = gpiochip_get_data(gc);
int offset = d->hwirq;
int regoffset = offset / 8;
int mask = BIT(offset % 8);
tc3589x_gpio->regs[REG_IE][regoffset] |= mask;
}
static struct irq_chip tc3589x_gpio_irq_chip = {
.name = "tc3589x-gpio",
.irq_bus_lock = tc3589x_gpio_irq_lock,
.irq_bus_sync_unlock = tc3589x_gpio_irq_sync_unlock,
.irq_mask = tc3589x_gpio_irq_mask,
.irq_unmask = tc3589x_gpio_irq_unmask,
.irq_set_type = tc3589x_gpio_irq_set_type,
};
static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
{
struct tc3589x_gpio *tc3589x_gpio = dev;
struct tc3589x *tc3589x = tc3589x_gpio->tc3589x;
u8 status[CACHE_NR_BANKS];
int ret;
int i;
ret = tc3589x_block_read(tc3589x, TC3589x_GPIOMIS0,
ARRAY_SIZE(status), status);
if (ret < 0)
return IRQ_NONE;
for (i = 0; i < ARRAY_SIZE(status); i++) {
unsigned int stat = status[i];
if (!stat)
continue;
while (stat) {
int bit = __ffs(stat);
int line = i * 8 + bit;
int irq = irq_find_mapping(tc3589x_gpio->chip.irqdomain,
line);
handle_nested_irq(irq);
stat &= ~(1 << bit);
}
tc3589x_reg_write(tc3589x, TC3589x_GPIOIC0 + i, status[i]);
}
return IRQ_HANDLED;
}
static int tc3589x_gpio_probe(struct platform_device *pdev)
{
struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
struct device_node *np = pdev->dev.of_node;
struct tc3589x_gpio *tc3589x_gpio;
int ret;
int irq;
if (!np) {
dev_err(&pdev->dev, "No Device Tree node found\n");
return -EINVAL;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
tc3589x_gpio = devm_kzalloc(&pdev->dev, sizeof(struct tc3589x_gpio),
GFP_KERNEL);
if (!tc3589x_gpio)
return -ENOMEM;
mutex_init(&tc3589x_gpio->irq_lock);
tc3589x_gpio->dev = &pdev->dev;
tc3589x_gpio->tc3589x = tc3589x;
tc3589x_gpio->chip = template_chip;
tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
tc3589x_gpio->chip.parent = &pdev->dev;
tc3589x_gpio->chip.base = -1;
tc3589x_gpio->chip.of_node = np;
/* Bring the GPIO module out of reset */
ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
TC3589x_RSTCTRL_GPIRST, 0);
if (ret < 0)
return ret;
ret = devm_request_threaded_irq(&pdev->dev,
irq, NULL, tc3589x_gpio_irq,
IRQF_ONESHOT, "tc3589x-gpio",
tc3589x_gpio);
if (ret) {
dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
return ret;
}
ret = devm_gpiochip_add_data(&pdev->dev, &tc3589x_gpio->chip,
tc3589x_gpio);
if (ret) {
dev_err(&pdev->dev, "unable to add gpiochip: %d\n", ret);
return ret;
}
ret = gpiochip_irqchip_add_nested(&tc3589x_gpio->chip,
&tc3589x_gpio_irq_chip,
0,
handle_simple_irq,
IRQ_TYPE_NONE);
if (ret) {
dev_err(&pdev->dev,
"could not connect irqchip to gpiochip\n");
return ret;
}
gpiochip_set_nested_irqchip(&tc3589x_gpio->chip,
&tc3589x_gpio_irq_chip,
irq);
platform_set_drvdata(pdev, tc3589x_gpio);
return 0;
}
static struct platform_driver tc3589x_gpio_driver = {
.driver.name = "tc3589x-gpio",
.probe = tc3589x_gpio_probe,
};
static int __init tc3589x_gpio_init(void)
{
return platform_driver_register(&tc3589x_gpio_driver);
}
subsys_initcall(tc3589x_gpio_init);