[RFC 2/2] [WIP] gpio: add driver for PCA95[357]x, PCA9698, TCA64xx, and MAX7310 SMBus I/O expanders
Antony Pavlov
antonynpavlov at gmail.com
Mon Jun 16 01:00:13 PDT 2014
TODOs:
* can we drop depricated device-tree properties?
Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
---
drivers/gpio/Kconfig | 20 ++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-pca953x.c | 511 ++++++++++++++++++++++++++++++++++++++++
include/platform_data/pca953x.h | 27 +++
4 files changed, 559 insertions(+)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 7302955..b821682 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -48,6 +48,26 @@ config GPIO_ORION
found on Marvell Orion and MVEBU SoCs (Armada 370/XP,
Dove, Kirkwood, MV78x00, Orion5x).
+config GPIO_PCA953X
+ bool "PCA95[357]x, PCA9698, TCA64xx, and MAX7310 I/O ports"
+ depends on I2C
+ help
+ Say yes here to provide access to several register-oriented
+ SMBus I/O expanders, made mostly by NXP or TI. Compatible
+ models include:
+
+ 4 bits: pca9536, pca9537
+
+ 8 bits: max7310, max7315, pca6107, pca9534, pca9538, pca9554,
+ pca9556, pca9557, pca9574, tca6408, xra1202
+
+ 16 bits: max7312, max7313, pca9535, pca9539, pca9555, pca9575,
+ tca6416
+
+ 24 bits: tca6424
+
+ 40 bits: pca9505, pca9698
+
config GPIO_PL061
bool "PrimeCell PL061 GPIO support"
depends on ARM_AMBA
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 68a76a3..4768dfe 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_GPIO_GENERIC) += gpio-generic.o
obj-$(CONFIG_GPIO_IMX) += gpio-imx.o
obj-$(CONFIG_GPIO_ORION) += gpio-orion.o
obj-$(CONFIG_GPIO_OMAP) += gpio-omap.o
+obj-$(CONFIG_GPIO_PCA953X) += gpio-pca953x.o
obj-$(CONFIG_GPIO_PL061) += gpio-pl061.o
obj-$(CONFIG_GPIO_STMPE) += gpio-stmpe.o
obj-$(CONFIG_GPIO_TEGRA) += gpio-tegra.o
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
new file mode 100644
index 0000000..f55b313
--- /dev/null
+++ b/drivers/gpio/gpio-pca953x.c
@@ -0,0 +1,511 @@
+/*
+ * PCA953x 4/8/16/24/40 bit I/O ports
+ *
+ * This code was ported from linux-3.15 kernel by Antony Pavlov.
+ *
+ * Copyright (C) 2005 Ben Gardner <bgardner at 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 <common.h>
+#include <init.h>
+#include <malloc.h>
+#include <driver.h>
+#include <xfuncs.h>
+#include <errno.h>
+#include <i2c/i2c.h>
+
+#include <gpio.h>
+#include <platform_data/pca953x.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 PCA_GPIO_MASK 0x00FF
+#define PCA_INT 0x0100
+#define PCA953X_TYPE 0x1000
+#define PCA957X_TYPE 0x2000
+
+static struct platform_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, },
+ { "xra1202", 8 | PCA953X_TYPE },
+ { }
+};
+
+#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 i2c_client *client;
+ struct gpio_chip gpio_chip;
+ const char *const *names;
+ int chip_type;
+};
+
+static inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
+{
+ return container_of(gc, struct pca953x_chip, gpio_chip);
+}
+
+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;
+}
+
+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;
+}
+
+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, (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;
+}
+
+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;
+}
+
+static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
+{
+ struct pca953x_chip *chip = to_pca(gc);
+ u8 reg_val;
+ int ret, offset = 0;
+
+ 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:
+ return ret;
+}
+
+static int pca953x_gpio_direction_output(struct gpio_chip *gc,
+ unsigned off, int val)
+{
+ struct pca953x_chip *chip = to_pca(gc);
+ u8 reg_val;
+ int ret, offset = 0;
+
+ /* 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:
+ return ret;
+}
+
+static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
+{
+ struct pca953x_chip *chip = to_pca(gc);
+ u32 reg_val;
+ int ret, offset = 0;
+
+ switch (chip->chip_type) {
+ case PCA953X_TYPE:
+ offset = PCA953X_INPUT;
+ break;
+ case PCA957X_TYPE:
+ offset = PCA957X_IN;
+ break;
+ }
+ ret = pca953x_read_single(chip, offset, ®_val, off);
+ 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;
+}
+
+static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
+{
+ struct pca953x_chip *chip = to_pca(gc);
+ u8 reg_val;
+ int ret, offset = 0;
+
+ 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:
+ return;
+}
+
+static struct gpio_ops pca953x_gpio_ops = {
+ .direction_input = pca953x_gpio_direction_input,
+ .direction_output = pca953x_gpio_direction_output,
+ .get = pca953x_gpio_get_value,
+ .set = pca953x_gpio_set_value,
+};
+
+static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
+{
+ struct gpio_chip *gc;
+
+ gc = &chip->gpio_chip;
+
+ gc->ops = &pca953x_gpio_ops;
+
+ gc->base = chip->gpio_start;
+ gc->ngpio = gpios;
+ gc->dev = &chip->client->dev;
+}
+
+/*
+ * Handlers for alternative sources of platform_data
+ */
+#ifdef CONFIG_OF_GPIO
+/*
+ * Translate OpenFirmware node properties into platform_data
+ * WARNING: This is DEPRECATED and will be removed eventually!
+ */
+static void
+pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
+{
+ struct device_node *node;
+ const __be32 *val;
+ int size;
+
+ *gpio_base = -1;
+
+ node = client->dev.device_node;
+ if (node == NULL)
+ return;
+
+ val = of_get_property(node, "linux,gpio-base", &size);
+ WARN(val, "%s: device-tree property 'linux,gpio-base' is deprecated!", __func__);
+ if (val) {
+ if (size != sizeof(*val))
+ dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
+ node->full_name);
+ else
+ *gpio_base = be32_to_cpup(val);
+ }
+
+ val = of_get_property(node, "polarity", NULL);
+ WARN(val, "%s: device-tree property 'polarity' is deprecated!", __func__);
+ if (val)
+ *invert = *val;
+}
+#else
+static void
+pca953x_get_alt_pdata(struct i2c_client *client, int *gpio_base, u32 *invert)
+{
+ *gpio_base = -1;
+}
+#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;
+}
+
+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));
+ pca953x_write_regs(chip, PCA957X_INVRT, val);
+
+ /* To enable register 6, 7 to controll pull up and pull down */
+ memset(val, 0x02, NBANK(chip));
+ pca953x_write_regs(chip, PCA957X_BKEN, val);
+
+ return 0;
+out:
+ return ret;
+}
+
+static int pca953x_probe(struct device_d *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ unsigned long driver_data;
+ struct pca953x_platform_data *pdata;
+ struct pca953x_chip *chip;
+ int ret;
+ u32 invert = 0;
+
+ chip = xzalloc(sizeof(struct pca953x_chip));
+
+ driver_data = 0;
+ pdata = dev->platform_data;
+ if (pdata) {
+ chip->gpio_start = pdata->gpio_base;
+ invert = pdata->invert;
+ chip->names = pdata->names;
+ } else {
+ int err;
+
+ err = dev_get_drvdata(dev, &driver_data);
+ if (err)
+ return err;
+
+ pca953x_get_alt_pdata(client, &chip->gpio_start, &invert);
+ }
+
+ chip->client = client;
+
+ chip->chip_type = driver_data & (PCA953X_TYPE | PCA957X_TYPE);
+
+ /* initialize cached registers from their original values.
+ * we can't share this chip with another i2c master.
+ */
+ pca953x_setup_gpio(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 = gpiochip_add(&chip->gpio_chip);
+ 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);
+ }
+
+ return 0;
+}
+
+static struct driver_d pca953x_driver = {
+ .name = "pca953x",
+ .probe = pca953x_probe,
+ .id_table = pca953x_id,
+};
+
+static int __init pca953x_init(void)
+{
+ return i2c_driver_register(&pca953x_driver);
+}
+device_initcall(pca953x_init);
diff --git a/include/platform_data/pca953x.h b/include/platform_data/pca953x.h
new file mode 100644
index 0000000..cfd253e
--- /dev/null
+++ b/include/platform_data/pca953x.h
@@ -0,0 +1,27 @@
+#ifndef _LINUX_PCA953X_H
+#define _LINUX_PCA953X_H
+
+#include <linux/types.h>
+#include <i2c/i2c.h>
+
+/* platform data for the PCA9539 16-bit I/O expander driver */
+
+struct pca953x_platform_data {
+ /* number of the first GPIO */
+ unsigned gpio_base;
+
+ /* initial polarity inversion setting */
+ u32 invert;
+
+ void *context; /* param to setup/teardown */
+
+ int (*setup)(struct i2c_client *client,
+ unsigned gpio, unsigned ngpio,
+ void *context);
+ int (*teardown)(struct i2c_client *client,
+ unsigned gpio, unsigned ngpio,
+ void *context);
+ const char *const *names;
+};
+
+#endif /* _LINUX_PCA953X_H */
--
1.9.2
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