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![Haojian Zhuang](/assets/img/avatar_default.png)
PCA957x is i2c gpio expander, and similar to PCA953x. Although register configurations are different between PCA957x and PCA953x. They can share a lot of components, such as IRQ handling, GPIO IN/OUT. So updating PCA953x driver to support PCA957x chips. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
769 lines
17 KiB
C
769 lines
17 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 PCA957X_IN 0
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#define PCA957X_INVRT 1
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#define PCA957X_BKEN 2
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#define PCA957X_PUPD 3
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#define PCA957X_CFG 4
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#define PCA957X_OUT 5
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#define PCA957X_MSK 6
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#define PCA957X_INTS 7
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#define PCA_GPIO_MASK 0x00FF
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#define PCA_INT 0x0100
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#define PCA953X_TYPE 0x1000
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#define PCA957X_TYPE 0x2000
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static const struct i2c_device_id pca953x_id[] = {
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{ "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9536", 4 | PCA953X_TYPE, },
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{ "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
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{ "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
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{ "pca9556", 8 | PCA953X_TYPE, },
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{ "pca9557", 8 | PCA953X_TYPE, },
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{ "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
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{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
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{ "max7310", 8 | PCA953X_TYPE, },
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{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
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{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
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{ "max7315", 8 | PCA953X_TYPE | PCA_INT, },
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{ "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
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{ "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
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{ "tca6416", 16 | PCA953X_TYPE | PCA_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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struct mutex i2c_lock;
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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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int chip_type;
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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 = 0;
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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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switch (chip->chip_type) {
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case PCA953X_TYPE:
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ret = i2c_smbus_write_word_data(chip->client,
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reg << 1, val);
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break;
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case PCA957X_TYPE:
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ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
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val & 0xff);
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if (ret < 0)
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break;
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ret = i2c_smbus_write_byte_data(chip->client,
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(reg << 1) + 1,
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(val & 0xff00) >> 8);
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break;
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}
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}
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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, offset = 0;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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mutex_lock(&chip->i2c_lock);
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reg_val = chip->reg_direction | (1u << off);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_DIRECTION;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_CFG;
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break;
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}
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ret = pca953x_write_reg(chip, offset, reg_val);
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if (ret)
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goto exit;
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chip->reg_direction = reg_val;
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ret = 0;
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exit:
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mutex_unlock(&chip->i2c_lock);
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return ret;
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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, offset = 0;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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mutex_lock(&chip->i2c_lock);
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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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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_OUTPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_OUT;
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break;
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}
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ret = pca953x_write_reg(chip, offset, reg_val);
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if (ret)
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goto exit;
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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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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_DIRECTION;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_CFG;
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break;
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}
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ret = pca953x_write_reg(chip, offset, reg_val);
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if (ret)
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goto exit;
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chip->reg_direction = reg_val;
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ret = 0;
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exit:
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mutex_unlock(&chip->i2c_lock);
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return ret;
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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, offset = 0;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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mutex_lock(&chip->i2c_lock);
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_INPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_IN;
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break;
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}
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ret = pca953x_read_reg(chip, offset, ®_val);
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mutex_unlock(&chip->i2c_lock);
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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, offset = 0;
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chip = container_of(gc, struct pca953x_chip, gpio_chip);
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mutex_lock(&chip->i2c_lock);
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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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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_OUTPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_OUT;
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break;
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}
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ret = pca953x_write_reg(chip, offset, reg_val);
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if (ret)
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goto exit;
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chip->reg_output = reg_val;
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exit:
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mutex_unlock(&chip->i2c_lock);
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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(struct irq_data *d)
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{
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struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
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chip->irq_mask &= ~(1 << (d->irq - chip->irq_base));
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}
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static void pca953x_irq_unmask(struct irq_data *d)
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{
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struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
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chip->irq_mask |= 1 << (d->irq - chip->irq_base);
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}
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static void pca953x_irq_bus_lock(struct irq_data *d)
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{
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struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
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mutex_lock(&chip->irq_lock);
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}
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static void pca953x_irq_bus_sync_unlock(struct irq_data *d)
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{
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struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
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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(struct irq_data *d, unsigned int type)
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{
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struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
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uint16_t level = d->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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d->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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.irq_mask = pca953x_irq_mask,
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.irq_unmask = pca953x_irq_unmask,
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.irq_bus_lock = pca953x_irq_bus_lock,
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.irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
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.irq_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, offset = 0;
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_INPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_IN;
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break;
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}
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ret = pca953x_read_reg(chip, offset, &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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generic_handle_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, offset = 0;
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if (pdata->irq_base != -1
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&& (id->driver_data & PCA_INT)) {
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int lvl;
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switch (chip->chip_type) {
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case PCA953X_TYPE:
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offset = PCA953X_INPUT;
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break;
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case PCA957X_TYPE:
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offset = PCA957X_IN;
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break;
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}
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ret = pca953x_read_reg(chip, offset, &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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irq_set_chip_data(irq, chip);
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irq_set_chip_and_handler(irq, &pca953x_irq_chip,
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handle_simple_irq);
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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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irq_set_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_RISING |
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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:
|
|
chip->irq_base = -1;
|
|
return ret;
|
|
}
|
|
|
|
static void pca953x_irq_teardown(struct pca953x_chip *chip)
|
|
{
|
|
if (chip->irq_base != -1)
|
|
free_irq(chip->client->irq, chip);
|
|
}
|
|
#else /* CONFIG_GPIO_PCA953X_IRQ */
|
|
static int pca953x_irq_setup(struct pca953x_chip *chip,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct i2c_client *client = chip->client;
|
|
struct pca953x_platform_data *pdata = client->dev.platform_data;
|
|
|
|
if (pdata->irq_base != -1 && (id->driver_data & PCA_INT))
|
|
dev_warn(&client->dev, "interrupt support not compiled in\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pca953x_irq_teardown(struct pca953x_chip *chip)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Handlers for alternative sources of platform_data
|
|
*/
|
|
#ifdef CONFIG_OF_GPIO
|
|
/*
|
|
* Translate OpenFirmware node properties into platform_data
|
|
*/
|
|
static struct pca953x_platform_data *
|
|
pca953x_get_alt_pdata(struct i2c_client *client)
|
|
{
|
|
struct pca953x_platform_data *pdata;
|
|
struct device_node *node;
|
|
const __be32 *val;
|
|
int size;
|
|
|
|
node = client->dev.of_node;
|
|
if (node == NULL)
|
|
return NULL;
|
|
|
|
pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL);
|
|
if (pdata == NULL) {
|
|
dev_err(&client->dev, "Unable to allocate platform_data\n");
|
|
return NULL;
|
|
}
|
|
|
|
pdata->gpio_base = -1;
|
|
val = of_get_property(node, "linux,gpio-base", &size);
|
|
if (val) {
|
|
if (size != sizeof(*val))
|
|
dev_warn(&client->dev, "%s: wrong linux,gpio-base\n",
|
|
node->full_name);
|
|
else
|
|
pdata->gpio_base = be32_to_cpup(val);
|
|
}
|
|
|
|
val = of_get_property(node, "polarity", NULL);
|
|
if (val)
|
|
pdata->invert = *val;
|
|
|
|
return pdata;
|
|
}
|
|
#else
|
|
static struct pca953x_platform_data *
|
|
pca953x_get_alt_pdata(struct i2c_client *client)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static int __devinit device_pca953x_init(struct pca953x_chip *chip, int invert)
|
|
{
|
|
int ret;
|
|
|
|
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = pca953x_read_reg(chip, PCA953X_DIRECTION,
|
|
&chip->reg_direction);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* set platform specific polarity inversion */
|
|
ret = pca953x_write_reg(chip, PCA953X_INVERT, invert);
|
|
if (ret)
|
|
goto out;
|
|
return 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int __devinit device_pca957x_init(struct pca953x_chip *chip, int invert)
|
|
{
|
|
int ret;
|
|
uint16_t val = 0;
|
|
|
|
/* Let every port in proper state, that could save power */
|
|
pca953x_write_reg(chip, PCA957X_PUPD, 0x0);
|
|
pca953x_write_reg(chip, PCA957X_CFG, 0xffff);
|
|
pca953x_write_reg(chip, PCA957X_OUT, 0x0);
|
|
|
|
ret = pca953x_read_reg(chip, PCA957X_IN, &val);
|
|
if (ret)
|
|
goto out;
|
|
ret = pca953x_read_reg(chip, PCA957X_OUT, &chip->reg_output);
|
|
if (ret)
|
|
goto out;
|
|
ret = pca953x_read_reg(chip, PCA957X_CFG, &chip->reg_direction);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* set platform specific polarity inversion */
|
|
pca953x_write_reg(chip, PCA957X_INVRT, invert);
|
|
|
|
/* To enable register 6, 7 to controll pull up and pull down */
|
|
pca953x_write_reg(chip, PCA957X_BKEN, 0x202);
|
|
|
|
return 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int __devinit pca953x_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct pca953x_platform_data *pdata;
|
|
struct pca953x_chip *chip;
|
|
int ret = 0;
|
|
|
|
chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
|
|
if (chip == NULL)
|
|
return -ENOMEM;
|
|
|
|
pdata = client->dev.platform_data;
|
|
if (pdata == NULL) {
|
|
pdata = pca953x_get_alt_pdata(client);
|
|
/*
|
|
* Unlike normal platform_data, this is allocated
|
|
* dynamically and must be freed in the driver
|
|
*/
|
|
chip->dyn_pdata = pdata;
|
|
}
|
|
|
|
if (pdata == NULL) {
|
|
dev_dbg(&client->dev, "no platform data\n");
|
|
ret = -EINVAL;
|
|
goto out_failed;
|
|
}
|
|
|
|
chip->client = client;
|
|
|
|
chip->gpio_start = pdata->gpio_base;
|
|
|
|
chip->names = pdata->names;
|
|
chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
|
|
|
|
mutex_init(&chip->i2c_lock);
|
|
|
|
/* initialize cached registers from their original values.
|
|
* we can't share this chip with another i2c master.
|
|
*/
|
|
pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
|
|
|
|
if (chip->chip_type == PCA953X_TYPE)
|
|
device_pca953x_init(chip, pdata->invert);
|
|
else if (chip->chip_type == PCA957X_TYPE)
|
|
device_pca957x_init(chip, pdata->invert);
|
|
else
|
|
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_irq;
|
|
|
|
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_irq:
|
|
pca953x_irq_teardown(chip);
|
|
out_failed:
|
|
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");
|