Release 4.7 drivers/gpio/gpio-pca953x.c

/*
 *  PCA953x 4/8/16/24/40 bit I/O ports
 *
 *  Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
 *  Copyright (C) 2007 Marvell International Ltd.
 *
 *  Derived from drivers/i2c/chips/pca9539.c
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/platform_data/pca953x.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
#include <linux/of_platform.h>
#include <linux/acpi.h>


#define PCA953X_INPUT		0

#define PCA953X_OUTPUT		1

#define PCA953X_INVERT		2

#define PCA953X_DIRECTION	3


#define REG_ADDR_AI		0x80


#define PCA957X_IN		0

#define PCA957X_INVRT		1

#define PCA957X_BKEN		2

#define PCA957X_PUPD		3

#define PCA957X_CFG		4

#define PCA957X_OUT		5

#define PCA957X_MSK		6

#define PCA957X_INTS		7


#define PCAL953X_IN_LATCH	34

#define PCAL953X_INT_MASK	37

#define PCAL953X_INT_STAT	38


#define PCA_GPIO_MASK		0x00FF

#define PCA_INT			0x0100

#define PCA_PCAL			0x0200

#define PCA953X_TYPE		0x1000

#define PCA957X_TYPE		0x2000

#define PCA_TYPE_MASK		0xF000


#define PCA_CHIP_TYPE(x)	((x) & PCA_TYPE_MASK)


static const struct i2c_device_id pca953x_id[] = {
	{ "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
	{ "pca9534", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9536", 4  | PCA953X_TYPE, },
	{ "pca9537", 4  | PCA953X_TYPE | PCA_INT, },
	{ "pca9538", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9554", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
	{ "pca9556", 8  | PCA953X_TYPE, },
	{ "pca9557", 8  | PCA953X_TYPE, },
	{ "pca9574", 8  | PCA957X_TYPE | PCA_INT, },
	{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
	{ "pca9698", 40 | PCA953X_TYPE, },

	{ "max7310", 8  | PCA953X_TYPE, },
	{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7315", 8  | PCA953X_TYPE | PCA_INT, },
	{ "pca6107", 8  | PCA953X_TYPE | PCA_INT, },
	{ "tca6408", 8  | PCA953X_TYPE | PCA_INT, },
	{ "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
	{ "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
	{ "tca9539", 16 | PCA953X_TYPE | PCA_INT, },
	{ "xra1202", 8  | PCA953X_TYPE },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pca953x_id);


static const struct acpi_device_id pca953x_acpi_ids[] = {
	{ "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
	{ }
};
MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);


#define MAX_BANK 5

#define BANK_SZ 8


#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)


struct pca953x_chip {
	
unsigned gpio_start;
	
u8 reg_output[MAX_BANK];
	
u8 reg_direction[MAX_BANK];
	
struct mutex i2c_lock;

#ifdef CONFIG_GPIO_PCA953X_IRQ
	
struct mutex irq_lock;
	
u8 irq_mask[MAX_BANK];
	
u8 irq_stat[MAX_BANK];
	
u8 irq_trig_raise[MAX_BANK];
	
u8 irq_trig_fall[MAX_BANK];
#endif

	
struct i2c_client *client;
	
struct gpio_chip gpio_chip;
	
const char *const *names;
	
int	chip_type;
	
unsigned long driver_data;
};



static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
				int off)
{
	int ret;
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int offset = off / BANK_SZ;

	ret = i2c_smbus_read_byte_data(chip->client,
				(reg << bank_shift) + offset);
	*val = ret;

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed reading register\n");
		return ret;
	}

	return 0;
}

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static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
				int off)
{
	int ret = 0;
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int offset = off / BANK_SZ;

	ret = i2c_smbus_write_byte_data(chip->client,
					(reg << bank_shift) + offset, val);

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed writing register\n");
		return ret;
	}

	return 0;
}

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gregory clement
gregory clement
82
86.32%
1
25.00%
eric miao
eric miao
11
11.58%
1
25.00%
guennadi liakhovetski
guennadi liakhovetski
1
1.05%
1
25.00%
andreas schallenberg
andreas schallenberg
1
1.05%
1
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4
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static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret = 0;

	if (chip->gpio_chip.ngpio <= 8)
		ret = i2c_smbus_write_byte_data(chip->client, reg, *val);
	else if (chip->gpio_chip.ngpio >= 24) {
		int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
		ret = i2c_smbus_write_i2c_block_data(chip->client,
					(reg << bank_shift) | REG_ADDR_AI,
					NBANK(chip), val);
	} else {
		switch (chip->chip_type) {
		case PCA953X_TYPE:
			ret = i2c_smbus_write_word_data(chip->client,
			    reg << 1, cpu_to_le16(get_unaligned((u16 *)val)));
			break;
		case PCA957X_TYPE:
			ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
							val[0]);
			if (ret < 0)
				break;
			ret = i2c_smbus_write_byte_data(chip->client,
							(reg << 1) + 1,
							val[1]);
			break;
		}
	}

	if (ret < 0) {
		dev_err(&chip->client->dev, "failed writing register\n");
		return ret;
	}

	return 0;
}

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haojian zhuang
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guennadi liakhovetski
47
21.46%
1
12.50%
gregory clement
gregory clement
47
21.46%
1
12.50%
andreas schallenberg
andreas schallenberg
33
15.07%
2
25.00%
eric miao
eric miao
23
10.50%
1
12.50%
yong li
yong li
7
3.20%
1
12.50%
david brownell
david brownell
1
0.46%
1
12.50%
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219
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8
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static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

	if (chip->gpio_chip.ngpio <= 8) {
		ret = i2c_smbus_read_byte_data(chip->client, reg);
		*val = ret;
	} else if (chip->gpio_chip.ngpio >= 24) {
		int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);

		ret = i2c_smbus_read_i2c_block_data(chip->client,
					(reg << bank_shift) | REG_ADDR_AI,
					NBANK(chip), val);
	} else {
		ret = i2c_smbus_read_word_data(chip->client, reg << 1);
		val[0] = (u16)ret & 0xFF;
		val[1] = (u16)ret >> 8;
	}
	if (ret < 0) {
		dev_err(&chip->client->dev, "failed reading register\n");
		return ret;
	}

	return 0;
}

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eric miao
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gregory clement
gregory clement
46
27.06%
1
14.29%
andreas schallenberg
andreas schallenberg
44
25.88%
2
28.57%
guennadi liakhovetski
guennadi liakhovetski
25
14.71%
2
28.57%
david brownell
david brownell
1
0.59%
1
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170
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7
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static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 reg_val;
	int ret, offset = 0;

	mutex_lock(&chip->i2c_lock);
	reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));

	switch (chip->chip_type) {
	case PCA953X_TYPE:
		offset = PCA953X_DIRECTION;
		break;
	case PCA957X_TYPE:
		offset = PCA957X_CFG;
		break;
	}
	ret = pca953x_write_single(chip, offset, reg_val, off);
	if (ret)
		goto exit;

	chip->reg_direction[off / BANK_SZ] = reg_val;
	ret = 0;
exit:
	mutex_unlock(&chip->i2c_lock);
	return ret;
}

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eric miao
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haojian zhuang
haojian zhuang
29
21.48%
1
14.29%
roland stigge
roland stigge
26
19.26%
1
14.29%
gregory clement
gregory clement
18
13.33%
1
14.29%
linus walleij
linus walleij
5
3.70%
2
28.57%
guennadi liakhovetski
guennadi liakhovetski
2
1.48%
1
14.29%
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135
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7
100.00%



static int pca953x_gpio_direction_output(struct gpio_chip *gc,
		unsigned off, int val)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 reg_val;
	int ret, offset = 0;

	mutex_lock(&chip->i2c_lock);
	/* set output level */
	if (val)
		reg_val = chip->reg_output[off / BANK_SZ]
			| (1u << (off % BANK_SZ));
	else
		reg_val = chip->reg_output[off / BANK_SZ]
			& ~(1u << (off % BANK_SZ));

	switch (chip->chip_type) {
	case PCA953X_TYPE:
		offset = PCA953X_OUTPUT;
		break;
	case PCA957X_TYPE:
		offset = PCA957X_OUT;
		break;
	}
	ret = pca953x_write_single(chip, offset, reg_val, off);
	if (ret)
		goto exit;

	chip->reg_output[off / BANK_SZ] = reg_val;

	/* then direction */
	reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
	switch (chip->chip_type) {
	case PCA953X_TYPE:
		offset = PCA953X_DIRECTION;
		break;
	case PCA957X_TYPE:
		offset = PCA957X_CFG;
		break;
	}
	ret = pca953x_write_single(chip, offset, reg_val, off);
	if (ret)
		goto exit;

	chip->reg_direction[off / BANK_SZ] = reg_val;
	ret = 0;
exit:
	mutex_unlock(&chip->i2c_lock);
	return ret;
}

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eric miao
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haojian zhuang
54
22.13%
1
14.29%
gregory clement
gregory clement
44
18.03%
1
14.29%
roland stigge
roland stigge
29
11.89%
1
14.29%
linus walleij
linus walleij
5
2.05%
2
28.57%
guennadi liakhovetski
guennadi liakhovetski
2
0.82%
1
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static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u32 reg_val;
	int ret, offset = 0;

	mutex_lock(&chip->i2c_lock);
	switch (chip->chip_type) {
	case PCA953X_TYPE:
		offset = PCA953X_INPUT;
		break;
	case PCA957X_TYPE:
		offset = PCA957X_IN;
		break;
	}
	ret = pca953x_read_single(chip, offset, &reg_val, off);
	mutex_unlock(&chip->i2c_lock);
	if (ret < 0) {
		/* NOTE:  diagnostic already emitted; that's all we should
                 * do unless gpio_*_value_cansleep() calls become different
                 * from their nonsleeping siblings (and report faults).
                 */
		return 0;
	}

	return (reg_val & (1u << (off % BANK_SZ))) ? 1 : 0;
}

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eric miao
59
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11.11%
haojian zhuang
haojian zhuang
29
24.37%
1
11.11%
roland stigge
roland stigge
16
13.45%
1
11.11%
linus walleij
linus walleij
5
4.20%
2
22.22%
andrew ruder
andrew ruder
4
3.36%
1
11.11%
gregory clement
gregory clement
3
2.52%
1
11.11%
guennadi liakhovetski
guennadi liakhovetski
2
1.68%
1
11.11%
andreas schallenberg
andreas schallenberg
1
0.84%
1
11.11%
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119
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9
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static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 reg_val;
	int ret, offset = 0;

	mutex_lock(&chip->i2c_lock);
	if (val)
		reg_val = chip->reg_output[off / BANK_SZ]
			| (1u << (off % BANK_SZ));
	else
		reg_val = chip->reg_output[off / BANK_SZ]
			& ~(1u << (off % BANK_SZ));

	switch (chip->chip_type) {
	case PCA953X_TYPE:
		offset = PCA953X_OUTPUT;
		break;
	case PCA957X_TYPE:
		offset = PCA957X_OUT;
		break;
	}
	ret = pca953x_write_single(chip, offset, reg_val, off);
	if (ret)
		goto exit;

	chip->reg_output[off / BANK_SZ] = reg_val;
exit:
	mutex_unlock(&chip->i2c_lock);
}


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eric miao
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haojian zhuang
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18.35%
1
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gregory clement
gregory clement
27
17.09%
1
14.29%
roland stigge
roland stigge
21
13.29%
1
14.29%
linus walleij
linus walleij
5
3.16%
2
28.57%
guennadi liakhovetski
guennadi liakhovetski
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1.27%
1
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static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
		unsigned long *mask, unsigned long *bits)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 reg_val[MAX_BANK];
	int ret, offset = 0;
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
	int bank;

	switch (chip->chip_type) {
	case PCA953X_TYPE:
		offset = PCA953X_OUTPUT;
		break;
	case PCA957X_TYPE:
		offset = PCA957X_OUT;
		break;
	}

	memcpy(reg_val, chip->reg_output, NBANK(chip));
	mutex_lock(&chip->i2c_lock);
	for(bank=0; bank<NBANK(chip); bank++) {
		unsigned bankmask = mask[bank / sizeof(*mask)] >>
				    ((bank % sizeof(*mask)) * 8);
		if(bankmask) {
			unsigned bankval  = bits[bank / sizeof(*bits)] >>
					    ((bank % sizeof(*bits)) * 8);
			reg_val[bank] = (reg_val[bank] & ~bankmask) | bankval;
		}
	}
	ret = i2c_smbus_write_i2c_block_data(chip->client, offset << bank_shift, NBANK(chip), reg_val);
	if (ret)
		goto exit;

	memcpy(chip->reg_output, reg_val, NBANK(chip));
exit:
	mutex_unlock(&chip->i2c_lock);
}

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linus walleij
linus walleij
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static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
{
	struct gpio_chip *gc;

	gc = &chip->gpio_chip;

	gc->direction_input  = pca953x_gpio_direction_input;
	gc->direction_output = pca953x_gpio_direction_output;
	gc->get = pca953x_gpio_get_value;
	gc->set = pca953x_gpio_set_value;
	gc->set_multiple = pca953x_gpio_set_multiple;
	gc->can_sleep = true;

	gc->base = chip->gpio_start;
	gc->ngpio = gpios;
	gc->label = chip->client->name;
	gc->parent = &chip->client->dev;
	gc->owner = THIS_MODULE;
	gc->names = chip->names;
}

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eric miao
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19.82%
3
30.00%
david brownell
david brownell
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9.01%
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daniel silverstone
daniel silverstone
8
7.21%
1
10.00%
phil reid
phil reid
6
5.41%
1
10.00%
arnaud patard
arnaud patard
5
4.50%
1
10.00%
linus walleij
linus walleij
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1.80%
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10
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#ifdef CONFIG_GPIO_PCA953X_IRQ


static void pca953x_irq_mask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);

	chip->irq_mask[d->hwirq / BANK_SZ] &= ~(1 << (d->hwirq % BANK_SZ));
}

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linus walleij
linus walleij
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gregory clement
gregory clement
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20.00%
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lennert buytenhek
lennert buytenhek
8
14.55%
1
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nate case
nate case
2
3.64%
1
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eric miao
eric miao
1
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maxime ripard
maxime ripard
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static void pca953x_irq_unmask(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);

	chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
}

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gregory clement
gregory clement
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21.15%
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lennert buytenhek
lennert buytenhek
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15.38%
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ben dooks
ben dooks
3
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nate case
nate case
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maxime ripard
maxime ripard
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static void pca953x_irq_bus_lock(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);

	mutex_lock(&chip->irq_lock);
}

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30.77%
2
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nate case
8
20.51%
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lennert buytenhek
lennert buytenhek
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15.38%
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39
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static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	u8 new_irqs;
	int level, i;
	u8 invert_irq_mask[MAX_BANK];

	if (chip->driver_data & PCA_PCAL) {
		/* Enable latch on interrupt-enabled inputs */
		pca953x_write_regs(chip, PCAL953X_IN_LATCH, chip->irq_mask);

		for (i = 0; i < NBANK(chip); i++)
			invert_irq_mask[i] = ~chip->irq_mask[i];

		/* Unmask enabled interrupts */
		pca953x_write_regs(chip, PCAL953X_INT_MASK, invert_irq_mask);
	}

	/* Look for any newly setup interrupt */
	for (i = 0; i < NBANK(chip); i++) {
		new_irqs = chip->irq_trig_fall[i] | chip->irq_trig_raise[i];
		new_irqs &= ~chip->reg_direction[i];

		while (new_irqs) {
			level = __ffs(new_irqs);
			pca953x_gpio_direction_input(&chip->gpio_chip,
							level + (BANK_SZ * i));
			new_irqs &= ~(1 << level);
		}
	}

	mutex_unlock(&chip->irq_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
marc zyngier
marc zyngier
75
38.07%
2
28.57%
yong li
yong li
67
34.01%
1
14.29%
gregory clement
gregory clement
37
18.78%
1
14.29%
linus walleij
linus walleij
12
6.09%
2
28.57%
lennert buytenhek
lennert buytenhek
6
3.05%
1
14.29%
Total
197
100.00%
7
100.00%



static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
{
	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	int bank_nb = d->hwirq / BANK_SZ;
	u8 mask = 1 << (d->hwirq % BANK_SZ);

	if (!(type & IRQ_TYPE_EDGE_BOTH)) {
		dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
			d->irq, type);
		return -EINVAL;
	}

	if (type & IRQ_TYPE_EDGE_FALLING)
		chip->irq_trig_fall[bank_nb] |= mask;
	else
		chip->irq_trig_fall[bank_nb] &= ~mask;

	if (type & IRQ_TYPE_EDGE_RISING)
		chip->irq_trig_raise[bank_nb] |= mask;
	else
		chip->irq_trig_raise[bank_nb] &= ~mask;

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
marc zyngier
marc zyngier
96
66.21%
2
28.57%
gregory clement
gregory clement
26
17.93%
1
14.29%
linus walleij
linus walleij
12
8.28%
2
28.57%
lennert buytenhek
lennert buytenhek
8
5.52%
1
14.29%
maxime ripard
maxime ripard
3
2.07%
1
14.29%
Total
145
100.00%
7
100.00%


static struct irq_chip pca953x_irq_chip = {
	.name			= "pca953x",
	.irq_mask		= pca953x_irq_mask,
	.irq_unmask		= pca953x_irq_unmask,
	.irq_bus_lock		= pca953x_irq_bus_lock,
	.irq_bus_sync_unlock	= pca953x_irq_bus_sync_unlock,
	.irq_set_type		= pca953x_irq_set_type,
};



static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
{
	u8 cur_stat[MAX_BANK];
	u8 old_stat[MAX_BANK];
	bool pending_seen = false;
	bool trigger_seen = false;
	u8 trigger[MAX_BANK];
	int ret, i, offset = 0;

	if (chip->driver_data & PCA_PCAL) {
		/* Read the current interrupt status from the device */
		ret = pca953x_read_regs(chip, PCAL953X_INT_STAT, trigger);
		if (ret)
			return false;

		/* Check latched inputs and clear interrupt status */
		ret = pca953x_read_regs(chip, PCA953X_INPUT, cur_stat);
		if (ret)
			return false;

		for (i = 0; i < NBANK(chip); i++) {
			/* Apply filter for rising/falling edge selection */
			pending[i] = (~cur_stat[i] & chip->irq_trig_fall[i]) |
				(cur_stat[i] & chip->irq_trig_raise[i]);
			pending[i] &= trigger[i];
			if (pending[i])
				pending_seen = true;
		}

		return pending_seen;
	}

	switch (chip->chip_type) {
	case PCA953X_TYPE:
		offset = PCA953X_INPUT;
		break;
	case PCA957X_TYPE:
		offset = PCA957X_IN;
		break;
	}
	ret = pca953x_read_regs(chip, offset, cur_stat);
	if (ret)
		return false;

	/* Remove output pins from the equation */
	for (i = 0; i < NBANK(chip); i++)
		cur_stat[i] &= chip->reg_direction[i];

	memcpy(old_stat, chip->irq_stat, NBANK(chip));

	for (i = 0; i < NBANK(chip); i++) {
		trigger[i] = (cur_stat[i] ^ old_stat[i]) & chip->irq_mask[i];
		if (trigger[i])
			trigger_seen = true;
	}

	if (!trigger_seen)
		return false;

	memcpy(chip->irq_stat, cur_stat, NBANK(chip));

	for (i = 0; i < NBANK(chip); i++) {
		pending[i] = (old_stat[i] & chip->irq_trig_fall[i]) |
			(cur_stat[i] & chip->irq_trig_raise[i]);
		pending[i] &= trigger[i];
		if (pending[i])
			pending_seen = true;
	}

	return pending_seen;
}

Contributors
Person
Tokens
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CommitProp
gregory clement
gregory clement
139
33.74%
1
20.00%
yong li
yong li
125
30.34%
1
20.00%
marc zyngier
marc zyngier
94
22.82%
1
20.00%
haojian zhuang
haojian zhuang
29
7.04%
1
20.00%
joshua scott
joshua scott
25
6.07%
1
20.00%
Total
412
100.00%
5
100.00%



static irqreturn_t pca953x_irq_handler(int irq, void *devid)
{
	struct pca953x_chip *chip = devid;
	u8 pending[MAX_BANK];
	u8 level;
	unsigned nhandled = 0;
	int i;

	if (!pca953x_irq_pending(chip, pending))
		return IRQ_NONE;

	for (i = 0; i < NBANK(chip); i++) {
		while (pending[i]) {
			level = __ffs(pending[i]);
			handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain,
							level + (BANK_SZ * i)));
			pending[i] &= ~(1 << level);
			nhandled++;
		}
	}

	return (nhandled > 0) ? IRQ_HANDLED : IRQ_NONE;
}

Contributors
Person
Tokens
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CommitProp
marc zyngier
marc zyngier
57
42.86%
1
16.67%
gregory clement
gregory clement
50
37.59%
1
16.67%
toby smith
toby smith
17
12.78%
1
16.67%
maxime ripard
maxime ripard
5
3.76%
1
16.67%
linus walleij
linus walleij
3
2.26%
1
16.67%
david jander
david jander
1
0.75%
1
16.67%
Total
133
100.00%
6
100.00%



static int pca953x_irq_setup(struct pca953x_chip *chip,
			     int irq_base)
{
	struct i2c_client *client = chip->client;
	int ret, i, offset = 0;

	if (client->irq && irq_base != -1
			&& (chip->driver_data & PCA_INT)) {

		switch (chip->chip_type) {
		case PCA953X_TYPE:
			offset = PCA953X_INPUT;
			break;
		case PCA957X_TYPE:
			offset = PCA957X_IN;
			break;
		}
		ret = pca953x_read_regs(chip, offset, chip->irq_stat);
		if (ret)
			return ret;

		/*
                 * There is no way to know which GPIO line generated the
                 * interrupt.  We have to rely on the previous read for
                 * this purpose.
                 */
		for (i = 0; i < NBANK(chip); i++)
			chip->irq_stat[i] &= chip->reg_direction[i];
		mutex_init(&chip->irq_lock);

		ret = devm_request_threaded_irq(&client->dev,
					client->irq,
					   NULL,
					   pca953x_irq_handler,
					   IRQF_TRIGGER_LOW | IRQF_ONESHOT |
						   IRQF_SHARED,
					   dev_name(&client->dev), chip);
		if (ret) {
			dev_err(&client->dev, "failed to request irq %d\n",
				client->irq);
			return ret;
		}

		ret =  gpiochip_irqchip_add(&chip->gpio_chip,
					    &pca953x_irq_chip,
					    irq_base,
					    handle_simple_irq,
					    IRQ_TYPE_NONE);
		if (ret) {
			dev_err(&client->dev,
				"could not connect irqchip to gpiochip\n");
			return ret;
		}

		gpiochip_set_chained_irqchip(&chip->gpio_chip,
					     &pca953x_irq_chip,
					     client->irq, NULL);
	}

	return 0;
}

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marc zyngier
marc zyngier
111
44.22%
1
7.14%
linus walleij
linus walleij
43
17.13%
2
14.29%
haojian zhuang
haojian zhuang
30
11.95%
1
7.14%
gregory clement
gregory clement
29
11.55%
2
14.29%
grygorii strashko
grygorii strashko
17
6.77%
1
7.14%
david jander
david jander
11
4.38%
3
21.43%
markus pargmann
markus pargmann
4
1.59%
1
7.14%
alek du
alek du
3
1.20%
1
7.14%
toby smith
toby smith
2
0.80%
1
7.14%
andy shevchenko
andy shevchenko
1
0.40%
1
7.14%
Total
251
100.00%
14
100.00%

#else /* CONFIG_GPIO_PCA953X_IRQ */


static int pca953x_irq_setup(struct pca953x_chip *chip,
			     int irq_base)
{
	struct i2c_client *client = chip->client;

	if (irq_base != -1 && (chip->driver_data & PCA_INT))
		dev_warn(&client->dev, "interrupt support not compiled in\n");

	return 0;
}
Contributors
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marc zyngier
marc zyngier
44
86.27%
1
20.00%
alek du
alek du
3
5.88%
1
20.00%
david jander
david jander
2
3.92%
1
20.00%
haojian zhuang
haojian zhuang
1
1.96%
1
20.00%
andy shevchenko
andy shevchenko
1
1.96%
1
20.00%
Total
51
100.00%
5
100.00%

#endif



static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
{
	int ret;
	u8 val[MAX_BANK];

	ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
	if (ret)
		goto out;

	ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
			       chip->reg_direction);
	if (ret)
		goto out;

	/* set platform specific polarity inversion */
	if (invert)
		memset(val, 0xFF, NBANK(chip));
	else
		memset(val, 0, NBANK(chip));

	ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
out:
	return ret;
}

Contributors
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haojian zhuang
haojian zhuang
69
63.30%
1
33.33%
gregory clement
gregory clement
39
35.78%
1
33.33%
chandrabhanu mahapatra
chandrabhanu mahapatra
1
0.92%
1
33.33%
Total
109
100.00%
3
100.00%



static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
{
	int ret;
	u8 val[MAX_BANK];

	ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
	if (ret)
		goto out;
	ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
	if (ret)
		goto out;

	/* set platform specific polarity inversion */
	if (invert)
		memset(val, 0xFF, NBANK(chip));
	else
		memset(val, 0, NBANK(chip));
	ret = pca953x_write_regs(chip, PCA957X_INVRT, val);
	if (ret)
		goto out;

	/* To enable register 6, 7 to control pull up and pull down */
	memset(val, 0x02, NBANK(chip));
	ret = pca953x_write_regs(chip, PCA957X_BKEN, val);
	if (ret)
		goto out;

	return 0;
out:
	return ret;
}

Contributors
Person
Tokens
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haojian zhuang
haojian zhuang
79
52.67%
1
20.00%
gregory clement
gregory clement
51
34.00%
1
20.00%
nicholas krause
nicholas krause
18
12.00%
1
20.00%
colin cronin
colin cronin
1
0.67%
1
20.00%
chandrabhanu mahapatra
chandrabhanu mahapatra
1
0.67%
1
20.00%
Total
150
100.00%
5
100.00%


static const struct of_device_id pca953x_dt_ids[];



static int pca953x_probe(struct i2c_client *client,
				   const struct i2c_device_id *id)
{
	struct pca953x_platform_data *pdata;
	struct pca953x_chip *chip;
	int irq_base = 0;
	int ret;
	u32 invert = 0;

	chip = devm_kzalloc(&client->dev,
			sizeof(struct pca953x_chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;

	pdata = dev_get_platdata(&client->dev);
	if (pdata) {
		irq_base = pdata->irq_base;
		chip->gpio_start = pdata->gpio_base;
		invert = pdata->invert;
		chip->names = pdata->names;
	} else {
		chip->gpio_start = -1;
		irq_base = 0;
	}

	chip->client = client;

	if (id) {
		chip->driver_data = id->driver_data;
	} else {
		const struct acpi_device_id *id;
		const struct of_device_id *match;

		match = of_match_device(pca953x_dt_ids, &client->dev);
		if (match) {
			chip->driver_data = (int)(uintptr_t)match->data;
		} else {
			id = acpi_match_device(pca953x_acpi_ids, &client->dev);
			if (!id)
				return -ENODEV;

			chip->driver_data = id->driver_data;
		}
	}

	chip->chip_type = PCA_CHIP_TYPE(chip->driver_data);

	mutex_init(&chip->i2c_lock);

	/* initialize cached registers from their original values.
         * we can't share this chip with another i2c master.
         */
	pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);

	if (chip->chip_type == PCA953X_TYPE)
		ret = device_pca953x_init(chip, invert);
	else
		ret = device_pca957x_init(chip, invert);
	if (ret)
		return ret;

	ret = devm_gpiochip_add_data(&client->dev, &chip->gpio_chip, chip);
	if (ret)
		return ret;

	ret = pca953x_irq_setup(chip, irq_base);
	if (ret)
		return ret;

	if (pdata && pdata->setup) {
		ret = pdata->setup(client, chip->gpio_chip.base,
				chip->gpio_chip.ngpio, pdata->context);
		if (ret < 0)
			dev_warn(&client->dev, "setup failed, %d\n", ret);
	}

	i2c_set_clientdata(client, chip);
	return 0;
}

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eric miao
eric miao
118
30.03%
1
4.76%
andy shevchenko
andy shevchenko
57
14.50%
2
9.52%
nate case
nate case
52
13.23%
1
4.76%
ben dooks
ben dooks
41
10.43%
1
4.76%
david jander
david jander
34
8.65%
2
9.52%
linus walleij
linus walleij
23
5.85%
3
14.29%
haojian zhuang
haojian zhuang
14
3.56%
1
4.76%
marc zyngier
marc zyngier
11
2.80%
1
4.76%
wolfram sang
wolfram sang
9
2.29%
2
9.52%
roland stigge
roland stigge
8
2.04%
1
4.76%
guennadi liakhovetski
guennadi liakhovetski
7
1.78%
2
9.52%
laxman dewangan
laxman dewangan
6
1.53%
1
4.76%
chandrabhanu mahapatra
chandrabhanu mahapatra
5
1.27%
1
4.76%
markus pargmann
markus pargmann
4
1.02%
1
4.76%
jingoo han
jingoo han
4
1.02%
1
4.76%
Total
393
100.00%
21
100.00%



static int pca953x_remove(struct i2c_client *client)
{
	struct pca953x_platform_data *pdata = dev_get_platdata(&client->dev);
	struct pca953x_chip *chip = i2c_get_clientdata(client);
	int ret = 0;

	if (pdata && pdata->teardown) {
		ret = pdata->teardown(client, chip->gpio_chip.base,
				chip->gpio_chip.ngpio, pdata->context);
		if (ret < 0) {
			dev_err(&client->dev, "%s failed, %d\n",
					"teardown", ret);
			return ret;
		}
	}

	return 0;
}

Contributors
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Tokens
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CommitProp
eric miao
eric miao
93
91.18%
1
25.00%
jingoo han
jingoo han
4
3.92%
1
25.00%
guennadi liakhovetski
guennadi liakhovetski
3
2.94%
1
25.00%
david jander
david jander
2
1.96%
1
25.00%
Total
102
100.00%
4
100.00%

/* convenience to stop overlong match-table lines */

#define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int)

#define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int)


static const struct of_device_id pca953x_dt_ids[] = {
	{ .compatible = "nxp,pca9505", .data = OF_953X(40, PCA_INT), },
	{ .compatible = "nxp,pca9534", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "nxp,pca9535", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "nxp,pca9536", .data = OF_953X( 4, 0), },
	{ .compatible = "nxp,pca9537", .data = OF_953X( 4, PCA_INT), },
	{ .compatible = "nxp,pca9538", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "nxp,pca9539", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "nxp,pca9554", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "nxp,pca9555", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "nxp,pca9556", .data = OF_953X( 8, 0), },
	{ .compatible = "nxp,pca9557", .data = OF_953X( 8, 0), },
	{ .compatible = "nxp,pca9574", .data = OF_957X( 8, PCA_INT), },
	{ .compatible = "nxp,pca9575", .data = OF_957X(16, PCA_INT), },
	{ .compatible = "nxp,pca9698", .data = OF_953X(40, 0), },

	{ .compatible = "maxim,max7310", .data = OF_953X( 8, 0), },
	{ .compatible = "maxim,max7312", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "maxim,max7313", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "maxim,max7315", .data = OF_953X( 8, PCA_INT), },

	{ .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "ti,tca6408", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "ti,tca6416", .data = OF_953X(16, PCA_INT), },
	{ .compatible = "ti,tca6424", .data = OF_953X(24, PCA_INT), },

	{ .compatible = "onsemi,pca9654", .data = OF_953X( 8, PCA_INT), },

	{ .compatible = "exar,xra1202", .data = OF_953X( 8, 0), },
	{ }
};

MODULE_DEVICE_TABLE(of, pca953x_dt_ids);


static struct i2c_driver pca953x_driver = {
	.driver = {
		.name	= "pca953x",
		.of_match_table = pca953x_dt_ids,
		.acpi_match_table = ACPI_PTR(pca953x_acpi_ids),
        },
	.probe		= pca953x_probe,
	.remove		= pca953x_remove,
	.id_table	= pca953x_id,
};



static int __init pca953x_init(void)
{
	return i2c_add_driver(&pca953x_driver);
}
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eric miao
eric miao
14
87.50%
1
50.00%
guennadi liakhovetski
guennadi liakhovetski
2
12.50%
1
50.00%
Total
16
100.00%
2
100.00%

/* register after i2c postcore initcall and before
 * subsys initcalls that may rely on these GPIOs
 */

subsys_initcall(pca953x_init);



static void __exit pca953x_exit(void)
{
	i2c_del_driver(&pca953x_driver);
}
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eric miao
eric miao
13
86.67%
1
50.00%
guennadi liakhovetski
guennadi liakhovetski
2
13.33%
1
50.00%
Total
15
100.00%
2
100.00%


module_exit(pca953x_exit);

MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
MODULE_LICENSE("GPL");
Overall Contributors
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gregory clement
gregory clement
813
16.97%
3
4.35%
eric miao
eric miao
767
16.01%
1
1.45%
marc zyngier
marc zyngier
624
13.02%
2
2.90%
haojian zhuang
haojian zhuang
536
11.19%
1
1.45%
ben dooks
ben dooks
317
6.62%
3
4.35%
phil reid
phil reid
244
5.09%
1
1.45%
yong li
yong li
220
4.59%
2
2.90%
guennadi liakhovetski
guennadi liakhovetski
176
3.67%
3
4.35%
maxime ripard
maxime ripard
173
3.61%
2
2.90%
linus walleij
linus walleij
152
3.17%
5
7.25%
andy shevchenko
andy shevchenko
113
2.36%
2
2.90%
roland stigge
roland stigge
104
2.17%
1
1.45%
andreas schallenberg
andreas schallenberg
93
1.94%
2
2.90%
nate case
nate case
76
1.59%
2
2.90%
david jander
david jander
50
1.04%
5
7.25%
david brownell
david brownell
44
0.92%
5
7.25%
lennert buytenhek
lennert buytenhek
41
0.86%
1
1.45%
aaron sierra
aaron sierra
31
0.65%
3
4.35%
joshua scott
joshua scott
25
0.52%
1
1.45%
geert uytterhoeven
geert uytterhoeven
20
0.42%
1
1.45%
toby smith
toby smith
19
0.40%
2
2.90%
nicholas krause
nicholas krause
18
0.38%
1
1.45%
grygorii strashko
grygorii strashko
17
0.35%
1
1.45%
jean delvare
jean delvare
15
0.31%
1
1.45%
daniel silverstone
daniel silverstone
13
0.27%
1
1.45%
alek du
alek du
12
0.25%
2
2.90%
will newton
will newton
12
0.25%
1
1.45%
thierry reding
thierry reding
10
0.21%
1
1.45%
wolfram sang
wolfram sang
9
0.19%
2
2.90%
markus pargmann
markus pargmann
8
0.17%
1
1.45%
jingoo han
jingoo han
8
0.17%
1
1.45%
chandrabhanu mahapatra
chandrabhanu mahapatra
7
0.15%
1
1.45%
laxman dewangan
laxman dewangan
6
0.13%
1
1.45%
arnaud patard
arnaud patard
5
0.10%
1
1.45%
andrew ruder
andrew ruder
4
0.08%
1
1.45%
h hartley sweeten
h hartley sweeten
3
0.06%
1
1.45%
tejun heo
tejun heo
3
0.06%
1
1.45%
uwe kleine-koenig
uwe kleine-koenig
2
0.04%
1
1.45%
vivien didelot
vivien didelot
1
0.02%
1
1.45%
colin cronin
colin cronin
1
0.02%
1
1.45%
Total
4792
100.00%
69
100.00%
  
Directory: drivers/gpio

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