drivers/gpio/pca953x_gpio.c - platform/external/u-boot - Gitiles

 /*
  * Take linux kernel driver drivers/gpio/gpio-pca953x.c for reference.
  *
  * Copyright (C) 2016 Peng Fan <van.freenix@gmail.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  *
  */

 /*
  * Note:
  * The driver's compatible table is borrowed from Linux Kernel,
  * but now max supported gpio pins is 24 and only PCA953X_TYPE
  * is supported. PCA957X_TYPE is not supported now.
  * Also the Polarity Inversion feature is not supported now.
  *
  * TODO:
  * 1. Support PCA957X_TYPE
  * 2. Support 24 gpio pins
  * 3. Support Polarity Inversion
  */

 #include <common.h>
 #include <errno.h>
 #include <dm.h>
 #include <fdtdec.h>
 #include <i2c.h>
 #include <malloc.h>
 #include <asm/gpio.h>
 #include <asm/io.h>
 #include <dt-bindings/gpio/gpio.h>

 #define PCA953X_INPUT           0
 #define PCA953X_OUTPUT          1
 #define PCA953X_INVERT          2
 #define PCA953X_DIRECTION       3

 #define PCA_GPIO_MASK           0x00FF
 #define PCA_INT                 0x0100
 #define PCA953X_TYPE            0x1000
 #define PCA957X_TYPE            0x2000
 #define PCA_TYPE_MASK           0xF000
 #define PCA_CHIP_TYPE(x)        ((x) & PCA_TYPE_MASK)

 enum {
 	PCA953X_DIRECTION_IN,
 	PCA953X_DIRECTION_OUT,
 };

 #define MAX_BANK 5
 #define BANK_SZ 8

 DECLARE_GLOBAL_DATA_PTR;

 /*
  * struct pca953x_info - Data for pca953x
  *
  * @dev: udevice structure for the device
  * @addr: i2c slave address
  * @invert: Polarity inversion or not
  * @gpio_count: the number of gpio pins that the device supports
  * @chip_type: indicate the chip type,PCA953X or PCA957X
  * @bank_count: the number of banks that the device supports
  * @reg_output: array to hold the value of output registers
  * @reg_direction: array to hold the value of direction registers
  */
 struct pca953x_info {
 	struct udevice *dev;
 	int addr;
 	int invert;
 	int gpio_count;
 	int chip_type;
 	int bank_count;
 	u8 reg_output[MAX_BANK];
 	u8 reg_direction[MAX_BANK];
 };

 static int pca953x_write_single(struct udevice *dev, int reg, u8 val,
 				int offset)
 {
 	struct pca953x_info *info = dev_get_platdata(dev);
 	int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
 	int off = offset / BANK_SZ;
 	int ret = 0;

 	ret = dm_i2c_write(dev, (reg << bank_shift) + off, &val, 1);
 	if (ret) {
 		dev_err(dev, "%s error\n", __func__);
 		return ret;
 	}

 	return 0;
 }

 static int pca953x_read_single(struct udevice *dev, int reg, u8 *val,
 			       int offset)
 {
 	struct pca953x_info *info = dev_get_platdata(dev);
 	int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
 	int off = offset / BANK_SZ;
 	int ret;
 	u8 byte;

 	ret = dm_i2c_read(dev, (reg << bank_shift) + off, &byte, 1);
 	if (ret) {
 		dev_err(dev, "%s error\n", __func__);
 		return ret;
 	}

 	*val = byte;

 	return 0;
 }

 static int pca953x_read_regs(struct udevice *dev, int reg, u8 *val)
 {
 	struct pca953x_info *info = dev_get_platdata(dev);
 	int ret = 0;

 	if (info->gpio_count <= 8) {
 		ret = dm_i2c_read(dev, reg, val, 1);
 	} else if (info->gpio_count <= 16) {
 		ret = dm_i2c_read(dev, reg << 1, val, info->bank_count);
 	} else if (info->gpio_count == 40) {
 		/* Auto increment */
 		ret = dm_i2c_read(dev, (reg << 3) | 0x80, val, info->bank_count);
 	} else {
 		dev_err(dev, "Unsupported now\n");
 		return -EINVAL;
 	}

 	return ret;
 }

 static int pca953x_is_output(struct udevice *dev, int offset)
 {
 	struct pca953x_info *info = dev_get_platdata(dev);

 	int bank = offset / BANK_SZ;
 	int off = offset % BANK_SZ;

 	/*0: output; 1: input */
 	return !(info->reg_direction[bank] & (1 << off));
 }

 static int pca953x_get_value(struct udevice *dev, unsigned offset)
 {
 	int ret;
 	u8 val = 0;

 	ret = pca953x_read_single(dev, PCA953X_INPUT, &val, offset);
 	if (ret)
 		return ret;

 	return (val >> offset) & 0x1;
 }

 static int pca953x_set_value(struct udevice *dev, unsigned offset,
 			     int value)
 {
 	struct pca953x_info *info = dev_get_platdata(dev);
 	int bank = offset / BANK_SZ;
 	int off = offset % BANK_SZ;
 	u8 val;
 	int ret;

 	if (value)
 		val = info->reg_output[bank] | (1 << off);
 	else
 		val = info->reg_output[bank] & ~(1 << off);

 	ret = pca953x_write_single(dev, PCA953X_OUTPUT, val, offset);
 	if (ret)
 		return ret;

 	info->reg_output[bank] = val;

 	return 0;
 }

 static int pca953x_set_direction(struct udevice *dev, unsigned offset, int dir)
 {
 	struct pca953x_info *info = dev_get_platdata(dev);
 	int bank = offset / BANK_SZ;
 	int off = offset % BANK_SZ;
 	u8 val;
 	int ret;

 	if (dir == PCA953X_DIRECTION_IN)
 		val = info->reg_direction[bank] | (1 << off);
 	else
 		val = info->reg_direction[bank] & ~(1 << off);

 	ret = pca953x_write_single(dev, PCA953X_DIRECTION, val, offset);
 	if (ret)
 		return ret;

 	info->reg_direction[bank] = val;

 	return 0;
 }

 static int pca953x_direction_input(struct udevice *dev, unsigned offset)
 {
 	return pca953x_set_direction(dev, offset, PCA953X_DIRECTION_IN);
 }

 static int pca953x_direction_output(struct udevice *dev, unsigned offset,
 				    int value)
 {
 	/* Configure output value. */
 	pca953x_set_value(dev, offset, value);

 	/* Configure direction as output. */
 	pca953x_set_direction(dev, offset, PCA953X_DIRECTION_OUT);

 	return 0;
 }

 static int pca953x_get_function(struct udevice *dev, unsigned offset)
 {
 	if (pca953x_is_output(dev, offset))
 		return GPIOF_OUTPUT;
 	else
 		return GPIOF_INPUT;
 }

 static int pca953x_xlate(struct udevice *dev, struct gpio_desc *desc,
 			 struct fdtdec_phandle_args *args)
 {
 	desc->offset = args->args[0];
 	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;

 	return 0;
 }

 static const struct dm_gpio_ops pca953x_ops = {
 	.direction_input	= pca953x_direction_input,
 	.direction_output	= pca953x_direction_output,
 	.get_value		= pca953x_get_value,
 	.set_value		= pca953x_set_value,
 	.get_function		= pca953x_get_function,
 	.xlate			= pca953x_xlate,
 };

 static int pca953x_probe(struct udevice *dev)
 {
 	struct pca953x_info *info = dev_get_platdata(dev);
 	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
 	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
 	char name[32], *str;
 	int addr;
 	ulong driver_data;
 	int ret;

 	if (!info) {
 		dev_err(dev, "platdata not ready\n");
 		return -ENOMEM;
 	}

 	if (!chip) {
 		dev_err(dev, "i2c not ready\n");
 		return -ENODEV;
 	}

 	addr = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", 0);
 	if (addr == 0)
 		return -ENODEV;

 	info->addr = addr;

 	driver_data = dev_get_driver_data(dev);

 	info->gpio_count = driver_data & PCA_GPIO_MASK;
 	if (info->gpio_count > MAX_BANK * BANK_SZ) {
 		dev_err(dev, "Max support %d pins now\n", MAX_BANK * BANK_SZ);
 		return -EINVAL;
 	}

 	info->chip_type = PCA_CHIP_TYPE(driver_data);
 	if (info->chip_type != PCA953X_TYPE) {
 		dev_err(dev, "Only support PCA953X chip type now.\n");
 		return -EINVAL;
 	}

 	info->bank_count = DIV_ROUND_UP(info->gpio_count, BANK_SZ);

 	ret = pca953x_read_regs(dev, PCA953X_OUTPUT, info->reg_output);
 	if (ret) {
 		dev_err(dev, "Error reading output register\n");
 		return ret;
 	}

 	ret = pca953x_read_regs(dev, PCA953X_DIRECTION, info->reg_direction);
 	if (ret) {
 		dev_err(dev, "Error reading direction register\n");
 		return ret;
 	}

 	snprintf(name, sizeof(name), "gpio@%x_", info->addr);
 	str = strdup(name);
 	if (!str)
 		return -ENOMEM;
 	uc_priv->bank_name = str;
 	uc_priv->gpio_count = info->gpio_count;

 	dev_dbg(dev, "%s is ready\n", str);

 	return 0;
 }

 #define OF_953X(__nrgpio, __int) (ulong)(__nrgpio | PCA953X_TYPE | __int)
 #define OF_957X(__nrgpio, __int) (ulong)(__nrgpio | PCA957X_TYPE | __int)

 static const struct udevice_id pca953x_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), },
 	{ }
 };

 U_BOOT_DRIVER(pca953x) = {
 	.name		= "pca953x",
 	.id		= UCLASS_GPIO,
 	.ops		= &pca953x_ops,
 	.probe		= pca953x_probe,
 	.platdata_auto_alloc_size = sizeof(struct pca953x_info),
 	.of_match	= pca953x_ids,
 };
	/*
	* Take linux kernel driver drivers/gpio/gpio-pca953x.c for reference.
	*
	* Copyright (C) 2016 Peng Fan <van.freenix@gmail.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*
	*/

	/*
	* Note:
	* The driver's compatible table is borrowed from Linux Kernel,
	* but now max supported gpio pins is 24 and only PCA953X_TYPE
	* is supported. PCA957X_TYPE is not supported now.
	* Also the Polarity Inversion feature is not supported now.
	*
	* TODO:
	* 1. Support PCA957X_TYPE
	* 2. Support 24 gpio pins
	* 3. Support Polarity Inversion
	*/

	#include <common.h>
	#include <errno.h>
	#include <dm.h>
	#include <fdtdec.h>
	#include <i2c.h>
	#include <malloc.h>
	#include <asm/gpio.h>
	#include <asm/io.h>
	#include <dt-bindings/gpio/gpio.h>

	#define PCA953X_INPUT 0
	#define PCA953X_OUTPUT 1
	#define PCA953X_INVERT 2
	#define PCA953X_DIRECTION 3

	#define PCA_GPIO_MASK 0x00FF
	#define PCA_INT 0x0100
	#define PCA953X_TYPE 0x1000
	#define PCA957X_TYPE 0x2000
	#define PCA_TYPE_MASK 0xF000
	#define PCA_CHIP_TYPE(x) ((x) & PCA_TYPE_MASK)

	enum {
	PCA953X_DIRECTION_IN,
	PCA953X_DIRECTION_OUT,
	};

	#define MAX_BANK 5
	#define BANK_SZ 8

	DECLARE_GLOBAL_DATA_PTR;

	/*
	* struct pca953x_info - Data for pca953x
	*
	* @dev: udevice structure for the device
	* @addr: i2c slave address
	* @invert: Polarity inversion or not
	* @gpio_count: the number of gpio pins that the device supports
	* @chip_type: indicate the chip type,PCA953X or PCA957X
	* @bank_count: the number of banks that the device supports
	* @reg_output: array to hold the value of output registers
	* @reg_direction: array to hold the value of direction registers
	*/
	struct pca953x_info {
	struct udevice *dev;
	int addr;
	int invert;
	int gpio_count;
	int chip_type;
	int bank_count;
	u8 reg_output[MAX_BANK];
	u8 reg_direction[MAX_BANK];
	};

	static int pca953x_write_single(struct udevice *dev, int reg, u8 val,
	int offset)
	{
	struct pca953x_info *info = dev_get_platdata(dev);
	int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
	int off = offset / BANK_SZ;
	int ret = 0;

	ret = dm_i2c_write(dev, (reg << bank_shift) + off, &val, 1);
	if (ret) {
	dev_err(dev, "%s error\n", __func__);
	return ret;
	}

	return 0;
	}

	static int pca953x_read_single(struct udevice dev, int reg, u8 val,
	int offset)
	{
	struct pca953x_info *info = dev_get_platdata(dev);
	int bank_shift = fls((info->gpio_count - 1) / BANK_SZ);
	int off = offset / BANK_SZ;
	int ret;
	u8 byte;

	ret = dm_i2c_read(dev, (reg << bank_shift) + off, &byte, 1);
	if (ret) {
	dev_err(dev, "%s error\n", __func__);
	return ret;
	}

	*val = byte;

	return 0;
	}

	static int pca953x_read_regs(struct udevice dev, int reg, u8 val)
	{
	struct pca953x_info *info = dev_get_platdata(dev);
	int ret = 0;

	if (info->gpio_count <= 8) {
	ret = dm_i2c_read(dev, reg, val, 1);
	} else if (info->gpio_count <= 16) {
	ret = dm_i2c_read(dev, reg << 1, val, info->bank_count);
	} else if (info->gpio_count == 40) {
	/* Auto increment */
	ret = dm_i2c_read(dev, (reg << 3) \| 0x80, val, info->bank_count);
	} else {
	dev_err(dev, "Unsupported now\n");
	return -EINVAL;
	}

	return ret;
	}

	static int pca953x_is_output(struct udevice *dev, int offset)
	{
	struct pca953x_info *info = dev_get_platdata(dev);

	int bank = offset / BANK_SZ;
	int off = offset % BANK_SZ;

	/0: output; 1: input /
	return !(info->reg_direction[bank] & (1 << off));
	}

	static int pca953x_get_value(struct udevice *dev, unsigned offset)
	{
	int ret;
	u8 val = 0;

	ret = pca953x_read_single(dev, PCA953X_INPUT, &val, offset);
	if (ret)
	return ret;

	return (val >> offset) & 0x1;
	}

	static int pca953x_set_value(struct udevice *dev, unsigned offset,
	int value)
	{
	struct pca953x_info *info = dev_get_platdata(dev);
	int bank = offset / BANK_SZ;
	int off = offset % BANK_SZ;
	u8 val;
	int ret;

	if (value)
	val = info->reg_output[bank] \| (1 << off);
	else
	val = info->reg_output[bank] & ~(1 << off);

	ret = pca953x_write_single(dev, PCA953X_OUTPUT, val, offset);
	if (ret)
	return ret;

	info->reg_output[bank] = val;

	return 0;
	}

	static int pca953x_set_direction(struct udevice *dev, unsigned offset, int dir)
	{
	struct pca953x_info *info = dev_get_platdata(dev);
	int bank = offset / BANK_SZ;
	int off = offset % BANK_SZ;
	u8 val;
	int ret;

	if (dir == PCA953X_DIRECTION_IN)
	val = info->reg_direction[bank] \| (1 << off);
	else
	val = info->reg_direction[bank] & ~(1 << off);

	ret = pca953x_write_single(dev, PCA953X_DIRECTION, val, offset);
	if (ret)
	return ret;

	info->reg_direction[bank] = val;

	return 0;
	}

	static int pca953x_direction_input(struct udevice *dev, unsigned offset)
	{
	return pca953x_set_direction(dev, offset, PCA953X_DIRECTION_IN);
	}

	static int pca953x_direction_output(struct udevice *dev, unsigned offset,
	int value)
	{
	/* Configure output value. */
	pca953x_set_value(dev, offset, value);

	/* Configure direction as output. */
	pca953x_set_direction(dev, offset, PCA953X_DIRECTION_OUT);

	return 0;
	}

	static int pca953x_get_function(struct udevice *dev, unsigned offset)
	{
	if (pca953x_is_output(dev, offset))
	return GPIOF_OUTPUT;
	else
	return GPIOF_INPUT;
	}

	static int pca953x_xlate(struct udevice dev, struct gpio_desc desc,
	struct fdtdec_phandle_args *args)
	{
	desc->offset = args->args[0];
	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;

	return 0;
	}

	static const struct dm_gpio_ops pca953x_ops = {
	.direction_input = pca953x_direction_input,
	.direction_output = pca953x_direction_output,
	.get_value = pca953x_get_value,
	.set_value = pca953x_set_value,
	.get_function = pca953x_get_function,
	.xlate = pca953x_xlate,
	};

	static int pca953x_probe(struct udevice *dev)
	{
	struct pca953x_info *info = dev_get_platdata(dev);
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	struct dm_i2c_chip *chip = dev_get_parent_platdata(dev);
	char name[32], *str;
	int addr;
	ulong driver_data;
	int ret;

	if (!info) {
	dev_err(dev, "platdata not ready\n");
	return -ENOMEM;
	}

	if (!chip) {
	dev_err(dev, "i2c not ready\n");
	return -ENODEV;
	}

	addr = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", 0);
	if (addr == 0)
	return -ENODEV;

	info->addr = addr;

	driver_data = dev_get_driver_data(dev);

	info->gpio_count = driver_data & PCA_GPIO_MASK;
	if (info->gpio_count > MAX_BANK * BANK_SZ) {
	dev_err(dev, "Max support %d pins now\n", MAX_BANK * BANK_SZ);
	return -EINVAL;
	}

	info->chip_type = PCA_CHIP_TYPE(driver_data);
	if (info->chip_type != PCA953X_TYPE) {
	dev_err(dev, "Only support PCA953X chip type now.\n");
	return -EINVAL;
	}

	info->bank_count = DIV_ROUND_UP(info->gpio_count, BANK_SZ);

	ret = pca953x_read_regs(dev, PCA953X_OUTPUT, info->reg_output);
	if (ret) {
	dev_err(dev, "Error reading output register\n");
	return ret;
	}

	ret = pca953x_read_regs(dev, PCA953X_DIRECTION, info->reg_direction);
	if (ret) {
	dev_err(dev, "Error reading direction register\n");
	return ret;
	}

	snprintf(name, sizeof(name), "gpio@%x_", info->addr);
	str = strdup(name);
	if (!str)
	return -ENOMEM;
	uc_priv->bank_name = str;
	uc_priv->gpio_count = info->gpio_count;

	dev_dbg(dev, "%s is ready\n", str);

	return 0;
	}

	#define OF_953X(__nrgpio, __int) (ulong)(__nrgpio \| PCA953X_TYPE \| __int)
	#define OF_957X(__nrgpio, __int) (ulong)(__nrgpio \| PCA957X_TYPE \| __int)

	static const struct udevice_id pca953x_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), },
	{ }
	};

	U_BOOT_DRIVER(pca953x) = {
	.name = "pca953x",
	.id = UCLASS_GPIO,
	.ops = &pca953x_ops,
	.probe = pca953x_probe,
	.platdata_auto_alloc_size = sizeof(struct pca953x_info),
	.of_match = pca953x_ids,
	};