Release 4.11 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/gpio/consumer.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>
#include <linux/regulator/consumer.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, },

	{ "pcal9555a", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },

	{ "max7310", 8  | PCA953X_TYPE, },
	{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
	{ "max7315", 8  | PCA953X_TYPE | PCA_INT, },
	{ "max7318", 16 | 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) DIV_ROUND_UP(chip->gpio_chip.ngpio, BANK_SZ)


struct pca953x_reg_config {
	
int direction;
	
int output;
	
int input;
};


static const struct pca953x_reg_config pca953x_regs = {
	.direction = PCA953X_DIRECTION,
	.output = PCA953X_OUTPUT,
	.input = PCA953X_INPUT,
};


static const struct pca953x_reg_config pca957x_regs = {
	.direction = PCA957X_CFG,
	.output = PCA957X_OUT,
	.input = PCA957X_IN,
};


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;
	
unsigned long driver_data;
	
struct regulator *regulator;

	
const struct pca953x_reg_config *regs;

	
int (*write_regs)(struct pca953x_chip *, int, u8 *);
	
int (*read_regs)(struct pca953x_chip *, int, u8 *);
};



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;
	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;
}

Contributors
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Gregory CLEMENT
80
86.02%
1
25.00%
Eric Miao
11
11.83%
1
25.00%
Andreas Schallenberg
1
1.08%
1
25.00%
Guennadi Liakhovetski
1
1.08%
1
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93
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4
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static int pca953x_write_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
{
	return i2c_smbus_write_byte_data(chip->client, reg, *val);
}

Contributors
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Gregory CLEMENT
15
48.39%
1
25.00%
Guennadi Liakhovetski
10
32.26%
1
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Bartosz Golaszewski
4
12.90%
1
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Eric Miao
2
6.45%
1
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31
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static int pca953x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
{
	__le16 word = cpu_to_le16(get_unaligned((u16 *)val));

	return i2c_smbus_write_word_data(chip->client,
					 reg << 1, (__force u16)word);
}

Contributors
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Andy Shevchenko
19
37.25%
1
12.50%
Bartosz Golaszewski
14
27.45%
1
12.50%
Eric Miao
8
15.69%
1
12.50%
Gregory CLEMENT
3
5.88%
1
12.50%
Andreas Schallenberg
3
5.88%
2
25.00%
Yong Li
2
3.92%
1
12.50%
Guennadi Liakhovetski
2
3.92%
1
12.50%
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51
100.00%
8
100.00%



static int pca957x_write_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

	ret = i2c_smbus_write_byte_data(chip->client, reg << 1, val[0]);
	if (ret < 0)
		return ret;

	return i2c_smbus_write_byte_data(chip->client, (reg << 1) + 1, val[1]);
}

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Haojian Zhuang
39
56.52%
1
33.33%
Bartosz Golaszewski
24
34.78%
1
33.33%
Gregory CLEMENT
6
8.70%
1
33.33%
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69
100.00%
3
100.00%



static int pca953x_write_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
{
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);

	return i2c_smbus_write_i2c_block_data(chip->client,
					      (reg << bank_shift) | REG_ADDR_AI,
					      NBANK(chip), val);
}

Contributors
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Bartosz Golaszewski
58
98.31%
1
50.00%
Haojian Zhuang
1
1.69%
1
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59
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2
100.00%



static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret = 0;

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

	return 0;
}

Contributors
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Bartosz Golaszewski
35
56.45%
1
25.00%
Guennadi Liakhovetski
17
27.42%
1
25.00%
Eric Miao
9
14.52%
1
25.00%
David Brownell
1
1.61%
1
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62
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4
100.00%



static int pca953x_read_regs_8(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

	ret = i2c_smbus_read_byte_data(chip->client, reg);
	*val = ret;

	return ret;
}

Contributors
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Eric Miao
17
42.50%
1
16.67%
Guennadi Liakhovetski
12
30.00%
2
33.33%
Andreas Schallenberg
6
15.00%
1
16.67%
Bartosz Golaszewski
4
10.00%
1
16.67%
Gregory CLEMENT
1
2.50%
1
16.67%
Total
40
100.00%
6
100.00%



static int pca953x_read_regs_16(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

	ret = i2c_smbus_read_word_data(chip->client, reg << 1);
	val[0] = (u16)ret & 0xFF;
	val[1] = (u16)ret >> 8;

	return ret;
}

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Bartosz Golaszewski
59
96.72%
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Andreas Schallenberg
2
3.28%
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61
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static int pca953x_read_regs_24(struct pca953x_chip *chip, int reg, u8 *val)
{
	int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);

	return i2c_smbus_read_i2c_block_data(chip->client,
					     (reg << bank_shift) | REG_ADDR_AI,
					     NBANK(chip), val);
}

Contributors
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Gregory CLEMENT
23
38.98%
1
25.00%
Bartosz Golaszewski
18
30.51%
1
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Andreas Schallenberg
18
30.51%
2
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59
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static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val)
{
	int ret;

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

	return 0;
}

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Eric Miao
32
53.33%
1
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Bartosz Golaszewski
24
40.00%
1
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Andreas Schallenberg
2
3.33%
1
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David Brownell
1
1.67%
1
20.00%
Gregory CLEMENT
1
1.67%
1
20.00%
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60
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5
100.00%



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;

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

	ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
	if (ret)
		goto exit;

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

Contributors
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Eric Miao
54
50.47%
1
14.29%
Roland Stigge
23
21.50%
1
14.29%
Gregory CLEMENT
18
16.82%
1
14.29%
Linus Walleij
5
4.67%
2
28.57%
Bartosz Golaszewski
5
4.67%
1
14.29%
Guennadi Liakhovetski
2
1.87%
1
14.29%
Total
107
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7
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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;

	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));

	ret = pca953x_write_single(chip, chip->regs->output, 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));
	ret = pca953x_write_single(chip, chip->regs->direction, reg_val, off);
	if (ret)
		goto exit;

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

Contributors
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Eric Miao
109
55.61%
1
14.29%
Gregory CLEMENT
44
22.45%
1
14.29%
Roland Stigge
26
13.27%
1
14.29%
Bartosz Golaszewski
10
5.10%
1
14.29%
Linus Walleij
5
2.55%
2
28.57%
Guennadi Liakhovetski
2
1.02%
1
14.29%
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196
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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;

	mutex_lock(&chip->i2c_lock);
	ret = pca953x_read_single(chip, chip->regs->input, &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
62.11%
1
11.11%
Roland Stigge
16
16.84%
1
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Bartosz Golaszewski
5
5.26%
1
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Linus Walleij
5
5.26%
2
22.22%
Andrew Ruder
4
4.21%
1
11.11%
Gregory CLEMENT
3
3.16%
1
11.11%
Guennadi Liakhovetski
2
2.11%
1
11.11%
Andreas Schallenberg
1
1.05%
1
11.11%
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95
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9
100.00%



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;

	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));

	ret = pca953x_write_single(chip, chip->regs->output, reg_val, off);
	if (ret)
		goto exit;

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

Contributors
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Eric Miao
74
55.22%
1
14.29%
Gregory CLEMENT
27
20.15%
1
14.29%
Roland Stigge
21
15.67%
1
14.29%
Linus Walleij
5
3.73%
2
28.57%
Bartosz Golaszewski
5
3.73%
1
14.29%
Guennadi Liakhovetski
2
1.49%
1
14.29%
Total
134
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7
100.00%



static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
				      unsigned long *mask, unsigned long *bits)
{
	struct pca953x_chip *chip = gpiochip_get_data(gc);
	unsigned int bank_mask, bank_val;
	int bank_shift, bank;
	u8 reg_val[MAX_BANK];
	int ret;

	bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);

	mutex_lock(&chip->i2c_lock);
	memcpy(reg_val, chip->reg_output, NBANK(chip));
	for (bank = 0; bank < NBANK(chip); bank++) {
		bank_mask = mask[bank / sizeof(*mask)] >>
			   ((bank % sizeof(*mask)) * 8);
		if (bank_mask) {
			bank_val = bits[bank / sizeof(*bits)] >>
				  ((bank % sizeof(*bits)) * 8);
			bank_val &= bank_mask;
			reg_val[bank] = (reg_val[bank] & ~bank_mask) | bank_val;
		}
	}

	ret = i2c_smbus_write_i2c_block_data(chip->client,
					     chip->regs->output << bank_shift,
					     NBANK(chip), reg_val);
	if (ret)
		goto exit;

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

Contributors
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Phil Reid
196
80.33%
3
42.86%
Bartosz Golaszewski
27
11.07%
2
28.57%
Geert Uytterhoeven
20
8.20%
1
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Linus Walleij
1
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1
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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
58
52.25%
1
10.00%
Guennadi Liakhovetski
22
19.82%
3
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David Brownell
10
9.01%
1
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Daniel Silverstone
8
7.21%
1
10.00%
Phil Reid
6
5.41%
1
10.00%
Arnaud Patard
5
4.50%
1
10.00%
Linus Walleij
2
1.80%
2
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111
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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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Marc Zyngier
20
36.36%
1
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Linus Walleij
12
21.82%
2
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Gregory CLEMENT
11
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1
12.50%
Lennert Buytenhek
8
14.55%
1
12.50%
Nate Case
2
3.64%
1
12.50%
Eric Miao
1
1.82%
1
12.50%
Maxime Ripard
1
1.82%
1
12.50%
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55
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8
100.00%



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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Marc Zyngier
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Linus Walleij
12
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Gregory CLEMENT
11
21.15%
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Lennert Buytenhek
8
15.38%
1
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Nate Case
3
5.77%
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Ben Dooks
3
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1
12.50%
Maxime Ripard
1
1.92%
1
12.50%
Total
52
100.00%
8
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Marc Zyngier
13
33.33%
1
20.00%
Linus Walleij
12
30.77%
2
40.00%
Nate Case
8
20.51%
1
20.00%
Lennert Buytenhek
6
15.38%
1
20.00%
Total
39
100.00%
5
100.00%



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
75
38.07%
2
28.57%
Yong Li
67
34.01%
1
14.29%
Gregory CLEMENT
37
18.78%
1
14.29%
Linus Walleij
12
6.09%
2
28.57%
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
96
66.21%
2
28.57%
Gregory CLEMENT
26
17.93%
1
14.29%
Linus Walleij
12
8.28%
2
28.57%
Lennert Buytenhek
8
5.52%
1
14.29%
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;

	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;
	}

	ret = pca953x_read_regs(chip, chip->regs->input, 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
Prop
Commits
CommitProp
Gregory CLEMENT
138
35.57%
1
16.67%
Yong Li
125
32.22%
1
16.67%
Marc Zyngier
94
24.23%
1
16.67%
Joshua Scott
25
6.44%
1
16.67%
Bartosz Golaszewski
5
1.29%
1
16.67%
Haojian Zhuang
1
0.26%
1
16.67%
Total
388
100.00%
6
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
Prop
Commits
CommitProp
Marc Zyngier
57
42.86%
1
16.67%
Gregory CLEMENT
50
37.59%
1
16.67%
Toby Smith
17
12.78%
1
16.67%
Maxime Ripard
5
3.76%
1
16.67%
Linus Walleij
3
2.26%
1
16.67%
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;

	if (client->irq && irq_base != -1
			&& (chip->driver_data & PCA_INT)) {
		ret = pca953x_read_regs(chip,
					chip->regs->input, 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_nested(&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_nested_irqchip(&chip->gpio_chip,
					    &pca953x_irq_chip,
					    client->irq);
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Marc Zyngier
111
49.33%
1
6.25%
Linus Walleij
44
19.56%
3
18.75%
Gregory CLEMENT
28
12.44%
2
12.50%
Grygorii Strashko
14
6.22%
1
6.25%
David Jander
11
4.89%
3
18.75%
Bartosz Golaszewski
5
2.22%
1
6.25%
Markus Pargmann
4
1.78%
1
6.25%
Alek Du
3
1.33%
1
6.25%
Haojian Zhuang
2
0.89%
1
6.25%
Toby Smith
2
0.89%
1
6.25%
Andy Shevchenko
1
0.44%
1
6.25%
Total
225
100.00%
16
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
Person
Tokens
Prop
Commits
CommitProp
Marc Zyngier
44
86.27%
1
20.00%
Alek Du
3
5.88%
1
20.00%
David Jander
2
3.92%
1
20.00%
Andy Shevchenko
1
1.96%
1
20.00%
Haojian Zhuang
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];

	chip->regs = &pca953x_regs;

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

	ret = pca953x_read_regs(chip, chip->regs->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
Person
Tokens
Prop
Commits
CommitProp
Haojian Zhuang
67
54.03%
1
25.00%
Gregory CLEMENT
39
31.45%
1
25.00%
Bartosz Golaszewski
17
13.71%
1
25.00%
Chandrabhanu Mahapatra
1
0.81%
1
25.00%
Total
124
100.00%
4
100.00%



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

	chip->regs = &pca957x_regs;

	ret = pca953x_read_regs(chip, chip->regs->output, chip->reg_output);
	if (ret)
		goto out;
	ret = pca953x_read_regs(chip, chip->regs->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, 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
Prop
Commits
CommitProp
Haojian Zhuang
77
46.67%
1
16.67%
Gregory CLEMENT
51
30.91%
1
16.67%
Nicholas Krause
18
10.91%
1
16.67%
Bartosz Golaszewski
17
10.30%
1
16.67%
Colin Cronin
1
0.61%
1
16.67%
Chandrabhanu Mahapatra
1
0.61%
1
16.67%
Total
165
100.00%
6
100.00%


static const struct of_device_id pca953x_dt_ids[];



static int pca953x_probe(struct i2c_client *client,
				   const struct i2c_device_id *i2c_id)
{
	struct pca953x_platform_data *pdata;
	struct pca953x_chip *chip;
	int irq_base = 0;
	int ret;
	u32 invert = 0;
	struct regulator *reg;

	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 {
		struct gpio_desc *reset_gpio;

		chip->gpio_start = -1;
		irq_base = 0;

		/* See if we need to de-assert a reset pin */
		reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
						     GPIOD_OUT_LOW);
		if (IS_ERR(reset_gpio))
			return PTR_ERR(reset_gpio);
	}

	chip->client = client;

	reg = devm_regulator_get(&client->dev, "vcc");
	if (IS_ERR(reg)) {
		ret = PTR_ERR(reg);
		if (ret != -EPROBE_DEFER)
			dev_err(&client->dev, "reg get err: %d\n", ret);
		return ret;
	}
	ret = regulator_enable(reg);
	if (ret) {
		dev_err(&client->dev, "reg en err: %d\n", ret);
		return ret;
	}
	chip->regulator = reg;

	if (i2c_id) {
		chip->driver_data = i2c_id->driver_data;
	} else {
		const struct acpi_device_id *acpi_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 {
			acpi_id = acpi_match_device(pca953x_acpi_ids, &client->dev);
			if (!acpi_id) {
				ret = -ENODEV;
				goto err_exit;
			}

			chip->driver_data = acpi_id->driver_data;
		}
	}

	mutex_init(&chip->i2c_lock);
	/*
         * In case we have an i2c-mux controlled by a GPIO provided by an
         * expander using the same driver higher on the device tree, read the
         * i2c adapter nesting depth and use the retrieved value as lockdep
         * subclass for chip->i2c_lock.
         *
         * REVISIT: This solution is not complete. It protects us from lockdep
         * false positives when the expander controlling the i2c-mux is on
         * a different level on the device tree, but not when it's on the same
         * level on a different branch (in which case the subclass number
         * would be the same).
         *
         * TODO: Once a correct solution is developed, a similar fix should be
         * applied to all other i2c-controlled GPIO expanders (and potentially
         * regmap-i2c).
         */
	lockdep_set_subclass(&chip->i2c_lock,
			     i2c_adapter_depth(client->adapter));

	/* 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->gpio_chip.ngpio <= 8) {
		chip->write_regs = pca953x_write_regs_8;
		chip->read_regs = pca953x_read_regs_8;
	} else if (chip->gpio_chip.ngpio >= 24) {
		chip->write_regs = pca953x_write_regs_24;
		chip->read_regs = pca953x_read_regs_24;
	} else {
		if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
			chip->write_regs = pca953x_write_regs_16;
		else
			chip->write_regs = pca957x_write_regs_16;
		chip->read_regs = pca953x_read_regs_16;
	}

	if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE)
		ret = device_pca953x_init(chip, invert);
	else
		ret = device_pca957x_init(chip, invert);
	if (ret)
		goto err_exit;

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

	ret = pca953x_irq_setup(chip, irq_base);
	if (ret)
		goto err_exit;

	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;

err_exit:
	regulator_disable(chip->regulator);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Miao
118
18.94%
1
3.45%
Phil Reid
118
18.94%
1
3.45%
Bartosz Golaszewski
102
16.37%
5
17.24%
Nate Case
51
8.19%
1
3.45%
Ben Dooks
41
6.58%
1
3.45%
Andy Shevchenko
40
6.42%
2
6.90%
David Jander
34
5.46%
2
6.90%
Steve Longerbeam
33
5.30%
1
3.45%
Wolfram Sang
16
2.57%
3
10.34%
Linus Walleij
14
2.25%
3
10.34%
Marc Zyngier
11
1.77%
1
3.45%
Haojian Zhuang
11
1.77%
1
3.45%
Roland Stigge
8
1.28%
1
3.45%
Guennadi Liakhovetski
7
1.12%
2
6.90%
Laxman Dewangan
6
0.96%
1
3.45%
Chandrabhanu Mahapatra
5
0.80%
1
3.45%
Markus Pargmann
4
0.64%
1
3.45%
Jingoo Han
4
0.64%
1
3.45%
Total
623
100.00%
29
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;

	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);
	} else {
		ret = 0;
	}

	regulator_disable(chip->regulator);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Miao
85
77.98%
1
16.67%
Phil Reid
8
7.34%
1
16.67%
Arnd Bergmann
7
6.42%
1
16.67%
Jingoo Han
4
3.67%
1
16.67%
Guennadi Liakhovetski
3
2.75%
1
16.67%
David Jander
2
1.83%
1
16.67%
Total
109
100.00%
6
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 = "maxim,max7318", .data = OF_953X(16, PCA_INT), },

	{ .compatible = "ti,pca6107", .data = OF_953X( 8, PCA_INT), },
	{ .compatible = "ti,pca9536", .data = OF_953X( 4, 0), },
	{ .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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Miao
14
87.50%
1
50.00%
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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Miao
13
86.67%
1
50.00%
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
Person
Tokens
Prop
Commits
CommitProp
Gregory CLEMENT
764
14.88%
3
3.41%
Eric Miao
748
14.57%
1
1.14%
Marc Zyngier
624
12.16%
2
2.27%
Bartosz Golaszewski
536
10.44%
7
7.95%
Phil Reid
336
6.55%
4
4.55%
Ben Dooks
317
6.18%
3
3.41%
Haojian Zhuang
308
6.00%
1
1.14%
Yong Li
215
4.19%
2
2.27%
Maxime Ripard
173
3.37%
2
2.27%
Guennadi Liakhovetski
145
2.82%
3
3.41%
Linus Walleij
144
2.81%
6
6.82%
Andy Shevchenko
127
2.47%
4
4.55%
Roland Stigge
98
1.91%
1
1.14%
Nate Case
75
1.46%
2
2.27%
David Jander
50
0.97%
5
5.68%
Andreas Schallenberg
47
0.92%
2
2.27%
David Brownell
44
0.86%
5
5.68%
Lennert Buytenhek
41
0.80%
1
1.14%
Steve Longerbeam
36
0.70%
1
1.14%
Aaron Sierra
31
0.60%
3
3.41%
Marek Vašut
27
0.53%
1
1.14%
Joshua Scott
25
0.49%
1
1.14%
Geert Uytterhoeven
20
0.39%
1
1.14%
Toby Smith
19
0.37%
2
2.27%
Vignesh R
18
0.35%
2
2.27%
Nicholas Krause
18
0.35%
1
1.14%
Wolfram Sang
16
0.31%
3
3.41%
Jean Delvare
15
0.29%
1
1.14%
Grygorii Strashko
14
0.27%
1
1.14%
Daniel Silverstone
13
0.25%
1
1.14%
Alek Du
12
0.23%
2
2.27%
Will Newton
12
0.23%
1
1.14%
Thierry Reding
10
0.19%
1
1.14%
Jingoo Han
8
0.16%
1
1.14%
Markus Pargmann
8
0.16%
1
1.14%
Arnd Bergmann
7
0.14%
1
1.14%
Chandrabhanu Mahapatra
7
0.14%
1
1.14%
Laxman Dewangan
6
0.12%
1
1.14%
Arnaud Patard
5
0.10%
1
1.14%
Andrew Ruder
4
0.08%
1
1.14%
H Hartley Sweeten
3
0.06%
1
1.14%
Tejun Heo
3
0.06%
1
1.14%
Uwe Kleine-König
2
0.04%
1
1.14%
Vivien Didelot
1
0.02%
1
1.14%
Colin Cronin
1
0.02%
1
1.14%
Total
5133
100.00%
88
100.00%
Directory: drivers/gpio

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