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![Uwe Kleine-König](/assets/img/avatar_default.png)
gpiolib doesn't need to modify the names and I assume most initializers use string constants that shouldn't be modified anyhow. [akpm@linux-foundation.org: fix drivers/gpio/cs5535-gpio.c] Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Kevin Wells <kevin.wells@nxp.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
617 lines
14 KiB
C
617 lines
14 KiB
C
/*
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* pca953x.c - 4/8/16 bit I/O ports
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*
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* Copyright (C) 2005 Ben Gardner <bgardner@wabtec.com>
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* Copyright (C) 2007 Marvell International Ltd.
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*
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* Derived from drivers/i2c/chips/pca9539.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/i2c.h>
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#include <linux/i2c/pca953x.h>
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#include <linux/slab.h>
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#ifdef CONFIG_OF_GPIO
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#endif
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#define PCA953X_INPUT 0
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#define PCA953X_OUTPUT 1
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#define PCA953X_INVERT 2
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#define PCA953X_DIRECTION 3
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#define PCA953X_GPIOS 0x00FF
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#define PCA953X_INT 0x0100
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static const struct i2c_device_id pca953x_id[] = {
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{ "pca9534", 8 | PCA953X_INT, },
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{ "pca9535", 16 | PCA953X_INT, },
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{ "pca9536", 4, },
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{ "pca9537", 4 | PCA953X_INT, },
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{ "pca9538", 8 | PCA953X_INT, },
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{ "pca9539", 16 | PCA953X_INT, },
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{ "pca9554", 8 | PCA953X_INT, },
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{ "pca9555", 16 | PCA953X_INT, },
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{ "pca9556", 8, },
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{ "pca9557", 8, },
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{ "max7310", 8, },
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{ "max7312", 16 | PCA953X_INT, },
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{ "max7313", 16 | PCA953X_INT, },
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{ "max7315", 8 | PCA953X_INT, },
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{ "pca6107", 8 | PCA953X_INT, },
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{ "tca6408", 8 | PCA953X_INT, },
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{ "tca6416", 16 | PCA953X_INT, },
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/* NYET: { "tca6424", 24, }, */
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, pca953x_id);
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struct pca953x_chip {
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unsigned gpio_start;
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uint16_t reg_output;
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uint16_t reg_direction;
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#ifdef CONFIG_GPIO_PCA953X_IRQ
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struct mutex irq_lock;
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uint16_t irq_mask;
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uint16_t irq_stat;
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uint16_t irq_trig_raise;
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uint16_t irq_trig_fall;
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int irq_base;
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#endif
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struct i2c_client *client;
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struct pca953x_platform_data *dyn_pdata;
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struct gpio_chip gpio_chip;
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const char *const *names;
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};
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static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
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{
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int ret;
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if (chip->gpio_chip.ngpio <= 8)
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ret = i2c_smbus_write_byte_data(chip->client, reg, val);
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else
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ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
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if (ret < 0) {
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dev_err(&chip->client->dev, "failed writing register\n");
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return ret;
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}
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return 0;
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}
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static int pca953x_read_reg(struct pca953x_chip *chip, int reg, uint16_t *val)
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{
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int ret;
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if (chip->gpio_chip.ngpio <= 8)
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ret = i2c_smbus_read_byte_data(chip->client, reg);
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else
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ret = i2c_smbus_read_word_data(chip->client, reg << 1);
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if (ret < 0) {
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dev_err(&chip->client->dev, "failed reading register\n");
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return ret;
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}
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*val = (uint16_t)ret;
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return 0;
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}
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static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
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{
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struct pca953x_chip *chip;
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uint16_t reg_val;
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int ret;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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reg_val = chip->reg_direction | (1u << off);
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ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
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if (ret)
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return ret;
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chip->reg_direction = reg_val;
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return 0;
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}
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static int pca953x_gpio_direction_output(struct gpio_chip *gc,
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unsigned off, int val)
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{
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struct pca953x_chip *chip;
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uint16_t reg_val;
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int ret;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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/* set output level */
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if (val)
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reg_val = chip->reg_output | (1u << off);
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else
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reg_val = chip->reg_output & ~(1u << off);
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ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
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if (ret)
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return ret;
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chip->reg_output = reg_val;
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/* then direction */
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reg_val = chip->reg_direction & ~(1u << off);
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ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
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if (ret)
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return ret;
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chip->reg_direction = reg_val;
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return 0;
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}
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static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
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{
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struct pca953x_chip *chip;
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uint16_t reg_val;
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int ret;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val);
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if (ret < 0) {
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/* NOTE: diagnostic already emitted; that's all we should
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* do unless gpio_*_value_cansleep() calls become different
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* from their nonsleeping siblings (and report faults).
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*/
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return 0;
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}
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return (reg_val & (1u << off)) ? 1 : 0;
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}
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static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
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{
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struct pca953x_chip *chip;
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uint16_t reg_val;
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int ret;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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if (val)
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reg_val = chip->reg_output | (1u << off);
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else
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reg_val = chip->reg_output & ~(1u << off);
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ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
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if (ret)
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return;
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chip->reg_output = reg_val;
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}
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static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
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{
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struct gpio_chip *gc;
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gc = &chip->gpio_chip;
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gc->direction_input = pca953x_gpio_direction_input;
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gc->direction_output = pca953x_gpio_direction_output;
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gc->get = pca953x_gpio_get_value;
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gc->set = pca953x_gpio_set_value;
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gc->can_sleep = 1;
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gc->base = chip->gpio_start;
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gc->ngpio = gpios;
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gc->label = chip->client->name;
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gc->dev = &chip->client->dev;
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gc->owner = THIS_MODULE;
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gc->names = chip->names;
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}
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#ifdef CONFIG_GPIO_PCA953X_IRQ
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static int pca953x_gpio_to_irq(struct gpio_chip *gc, unsigned off)
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{
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struct pca953x_chip *chip;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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return chip->irq_base + off;
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}
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static void pca953x_irq_mask(unsigned int irq)
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{
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struct pca953x_chip *chip = get_irq_chip_data(irq);
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chip->irq_mask &= ~(1 << (irq - chip->irq_base));
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}
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static void pca953x_irq_unmask(unsigned int irq)
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{
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struct pca953x_chip *chip = get_irq_chip_data(irq);
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chip->irq_mask |= 1 << (irq - chip->irq_base);
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}
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static void pca953x_irq_bus_lock(unsigned int irq)
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{
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struct pca953x_chip *chip = get_irq_chip_data(irq);
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mutex_lock(&chip->irq_lock);
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}
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static void pca953x_irq_bus_sync_unlock(unsigned int irq)
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{
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struct pca953x_chip *chip = get_irq_chip_data(irq);
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uint16_t new_irqs;
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uint16_t level;
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/* Look for any newly setup interrupt */
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new_irqs = chip->irq_trig_fall | chip->irq_trig_raise;
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new_irqs &= ~chip->reg_direction;
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while (new_irqs) {
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level = __ffs(new_irqs);
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pca953x_gpio_direction_input(&chip->gpio_chip, level);
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new_irqs &= ~(1 << level);
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}
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mutex_unlock(&chip->irq_lock);
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}
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static int pca953x_irq_set_type(unsigned int irq, unsigned int type)
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{
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struct pca953x_chip *chip = get_irq_chip_data(irq);
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uint16_t level = irq - chip->irq_base;
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uint16_t mask = 1 << level;
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if (!(type & IRQ_TYPE_EDGE_BOTH)) {
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dev_err(&chip->client->dev, "irq %d: unsupported type %d\n",
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irq, type);
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return -EINVAL;
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}
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if (type & IRQ_TYPE_EDGE_FALLING)
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chip->irq_trig_fall |= mask;
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else
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chip->irq_trig_fall &= ~mask;
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if (type & IRQ_TYPE_EDGE_RISING)
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chip->irq_trig_raise |= mask;
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else
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chip->irq_trig_raise &= ~mask;
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return 0;
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}
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static struct irq_chip pca953x_irq_chip = {
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.name = "pca953x",
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.mask = pca953x_irq_mask,
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.unmask = pca953x_irq_unmask,
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.bus_lock = pca953x_irq_bus_lock,
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.bus_sync_unlock = pca953x_irq_bus_sync_unlock,
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.set_type = pca953x_irq_set_type,
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};
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static uint16_t pca953x_irq_pending(struct pca953x_chip *chip)
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{
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uint16_t cur_stat;
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uint16_t old_stat;
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uint16_t pending;
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uint16_t trigger;
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int ret;
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ret = pca953x_read_reg(chip, PCA953X_INPUT, &cur_stat);
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if (ret)
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return 0;
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/* Remove output pins from the equation */
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cur_stat &= chip->reg_direction;
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old_stat = chip->irq_stat;
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trigger = (cur_stat ^ old_stat) & chip->irq_mask;
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if (!trigger)
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return 0;
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chip->irq_stat = cur_stat;
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pending = (old_stat & chip->irq_trig_fall) |
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(cur_stat & chip->irq_trig_raise);
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pending &= trigger;
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return pending;
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}
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static irqreturn_t pca953x_irq_handler(int irq, void *devid)
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{
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struct pca953x_chip *chip = devid;
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uint16_t pending;
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uint16_t level;
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pending = pca953x_irq_pending(chip);
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if (!pending)
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return IRQ_HANDLED;
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do {
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level = __ffs(pending);
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handle_nested_irq(level + chip->irq_base);
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pending &= ~(1 << level);
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} while (pending);
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return IRQ_HANDLED;
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}
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static int pca953x_irq_setup(struct pca953x_chip *chip,
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const struct i2c_device_id *id)
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{
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struct i2c_client *client = chip->client;
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struct pca953x_platform_data *pdata = client->dev.platform_data;
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int ret;
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if (pdata->irq_base && (id->driver_data & PCA953X_INT)) {
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int lvl;
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ret = pca953x_read_reg(chip, PCA953X_INPUT,
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&chip->irq_stat);
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if (ret)
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goto out_failed;
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/*
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* There is no way to know which GPIO line generated the
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* interrupt. We have to rely on the previous read for
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* this purpose.
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*/
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chip->irq_stat &= chip->reg_direction;
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chip->irq_base = pdata->irq_base;
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mutex_init(&chip->irq_lock);
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for (lvl = 0; lvl < chip->gpio_chip.ngpio; lvl++) {
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int irq = lvl + chip->irq_base;
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set_irq_chip_data(irq, chip);
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set_irq_chip_and_handler(irq, &pca953x_irq_chip,
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handle_edge_irq);
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set_irq_nested_thread(irq, 1);
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#ifdef CONFIG_ARM
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set_irq_flags(irq, IRQF_VALID);
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#else
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set_irq_noprobe(irq);
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#endif
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}
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ret = request_threaded_irq(client->irq,
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NULL,
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pca953x_irq_handler,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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dev_name(&client->dev), chip);
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if (ret) {
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dev_err(&client->dev, "failed to request irq %d\n",
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client->irq);
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goto out_failed;
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}
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chip->gpio_chip.to_irq = pca953x_gpio_to_irq;
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}
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return 0;
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out_failed:
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chip->irq_base = 0;
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return ret;
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}
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static void pca953x_irq_teardown(struct pca953x_chip *chip)
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{
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if (chip->irq_base)
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free_irq(chip->client->irq, chip);
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}
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#else /* CONFIG_GPIO_PCA953X_IRQ */
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static int pca953x_irq_setup(struct pca953x_chip *chip,
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const struct i2c_device_id *id)
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{
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struct i2c_client *client = chip->client;
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struct pca953x_platform_data *pdata = client->dev.platform_data;
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if (pdata->irq_base && (id->driver_data & PCA953X_INT))
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dev_warn(&client->dev, "interrupt support not compiled in\n");
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return 0;
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}
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static void pca953x_irq_teardown(struct pca953x_chip *chip)
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{
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}
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#endif
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/*
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* Handlers for alternative sources of platform_data
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*/
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#ifdef CONFIG_OF_GPIO
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/*
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* Translate OpenFirmware node properties into platform_data
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*/
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static struct pca953x_platform_data *
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pca953x_get_alt_pdata(struct i2c_client *client)
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{
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struct pca953x_platform_data *pdata;
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struct device_node *node;
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const uint16_t *val;
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node = client->dev.of_node;
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if (node == NULL)
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return NULL;
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pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL);
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if (pdata == NULL) {
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dev_err(&client->dev, "Unable to allocate platform_data\n");
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return NULL;
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}
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pdata->gpio_base = -1;
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val = of_get_property(node, "linux,gpio-base", NULL);
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if (val) {
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if (*val < 0)
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dev_warn(&client->dev,
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"invalid gpio-base in device tree\n");
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else
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pdata->gpio_base = *val;
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}
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val = of_get_property(node, "polarity", NULL);
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if (val)
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pdata->invert = *val;
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return pdata;
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}
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#else
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static struct pca953x_platform_data *
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pca953x_get_alt_pdata(struct i2c_client *client)
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{
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return NULL;
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}
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#endif
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static int __devinit pca953x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct pca953x_platform_data *pdata;
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struct pca953x_chip *chip;
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int ret;
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chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
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if (chip == NULL)
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return -ENOMEM;
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pdata = client->dev.platform_data;
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if (pdata == NULL) {
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pdata = pca953x_get_alt_pdata(client);
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/*
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* Unlike normal platform_data, this is allocated
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* dynamically and must be freed in the driver
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*/
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chip->dyn_pdata = pdata;
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}
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if (pdata == NULL) {
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dev_dbg(&client->dev, "no platform data\n");
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ret = -EINVAL;
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goto out_failed;
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}
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chip->client = client;
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chip->gpio_start = pdata->gpio_base;
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chip->names = pdata->names;
|
|
|
|
/* initialize cached registers from their original values.
|
|
* we can't share this chip with another i2c master.
|
|
*/
|
|
pca953x_setup_gpio(chip, id->driver_data & PCA953X_GPIOS);
|
|
|
|
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
|
|
if (ret)
|
|
goto out_failed;
|
|
|
|
ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
|
|
if (ret)
|
|
goto out_failed;
|
|
|
|
/* set platform specific polarity inversion */
|
|
ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
|
|
if (ret)
|
|
goto out_failed;
|
|
|
|
ret = pca953x_irq_setup(chip, id);
|
|
if (ret)
|
|
goto out_failed;
|
|
|
|
ret = gpiochip_add(&chip->gpio_chip);
|
|
if (ret)
|
|
goto out_failed;
|
|
|
|
if (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;
|
|
|
|
out_failed:
|
|
pca953x_irq_teardown(chip);
|
|
kfree(chip->dyn_pdata);
|
|
kfree(chip);
|
|
return ret;
|
|
}
|
|
|
|
static int pca953x_remove(struct i2c_client *client)
|
|
{
|
|
struct pca953x_platform_data *pdata = client->dev.platform_data;
|
|
struct pca953x_chip *chip = i2c_get_clientdata(client);
|
|
int ret = 0;
|
|
|
|
if (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;
|
|
}
|
|
}
|
|
|
|
ret = gpiochip_remove(&chip->gpio_chip);
|
|
if (ret) {
|
|
dev_err(&client->dev, "%s failed, %d\n",
|
|
"gpiochip_remove()", ret);
|
|
return ret;
|
|
}
|
|
|
|
pca953x_irq_teardown(chip);
|
|
kfree(chip->dyn_pdata);
|
|
kfree(chip);
|
|
return 0;
|
|
}
|
|
|
|
static struct i2c_driver pca953x_driver = {
|
|
.driver = {
|
|
.name = "pca953x",
|
|
},
|
|
.probe = pca953x_probe,
|
|
.remove = pca953x_remove,
|
|
.id_table = pca953x_id,
|
|
};
|
|
|
|
static int __init pca953x_init(void)
|
|
{
|
|
return i2c_add_driver(&pca953x_driver);
|
|
}
|
|
/* 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);
|
|
}
|
|
module_exit(pca953x_exit);
|
|
|
|
MODULE_AUTHOR("eric miao <eric.miao@marvell.com>");
|
|
MODULE_DESCRIPTION("GPIO expander driver for PCA953x");
|
|
MODULE_LICENSE("GPL");
|