482 lines
11 KiB
C
482 lines
11 KiB
C
/*
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* PCA953x 4/8/16/24/40 bit I/O ports
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*
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* This code was ported from linux-3.15 kernel by Antony Pavlov.
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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 <common.h>
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#include <init.h>
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#include <malloc.h>
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#include <driver.h>
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#include <xfuncs.h>
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#include <errno.h>
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#include <i2c/i2c.h>
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#include <gpio.h>
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#include <platform_data/pca953x.h>
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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 REG_ADDR_AI 0x80
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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 struct platform_device_id pca953x_id[] = {
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{ "pca9505", 40 | PCA953X_TYPE | PCA_INT, },
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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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{ "pca9698", 40 | PCA953X_TYPE, },
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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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{ "tca6424", 24 | PCA953X_TYPE | PCA_INT, },
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{ "xra1202", 8 | PCA953X_TYPE },
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{ }
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};
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#define MAX_BANK 5
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#define BANK_SZ 8
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#define NBANK(chip) (chip->gpio_chip.ngpio / BANK_SZ)
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struct pca953x_chip {
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unsigned gpio_start;
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u8 reg_output[MAX_BANK];
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u8 reg_direction[MAX_BANK];
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struct i2c_client *client;
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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 inline struct pca953x_chip *to_pca(struct gpio_chip *gc)
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{
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return container_of(gc, struct pca953x_chip, gpio_chip);
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}
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static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
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int off)
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{
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int ret;
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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int offset = off / BANK_SZ;
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ret = i2c_smbus_read_byte_data(chip->client,
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(reg << bank_shift) + offset);
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*val = ret;
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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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return 0;
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}
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static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val,
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int off)
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{
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int ret = 0;
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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int offset = off / BANK_SZ;
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ret = i2c_smbus_write_byte_data(chip->client,
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(reg << bank_shift) + offset, 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_write_regs(struct pca953x_chip *chip, int reg, u8 *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 if (chip->gpio_chip.ngpio >= 24) {
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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ret = i2c_smbus_write_i2c_block_data(chip->client,
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(reg << bank_shift) | REG_ADDR_AI,
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NBANK(chip), 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, (u16) *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[0]);
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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[1]);
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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_regs(struct pca953x_chip *chip, int reg, u8 *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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*val = ret;
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} else if (chip->gpio_chip.ngpio >= 24) {
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int bank_shift = fls((chip->gpio_chip.ngpio - 1) / BANK_SZ);
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ret = i2c_smbus_read_i2c_block_data(chip->client,
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(reg << bank_shift) | REG_ADDR_AI,
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NBANK(chip), val);
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} else {
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ret = i2c_smbus_read_word_data(chip->client, reg << 1);
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val[0] = (u16)ret & 0xFF;
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val[1] = (u16)ret >> 8;
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}
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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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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 = to_pca(gc);
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u8 reg_val;
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int ret, offset = 0;
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reg_val = chip->reg_direction[off / BANK_SZ] | (1u << (off % BANK_SZ));
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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_single(chip, offset, reg_val, off);
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if (ret)
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goto exit;
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chip->reg_direction[off / BANK_SZ] = reg_val;
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ret = 0;
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exit:
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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 = to_pca(gc);
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u8 reg_val;
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int ret, offset = 0;
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/* set output level */
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if (val)
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reg_val = chip->reg_output[off / BANK_SZ]
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| (1u << (off % BANK_SZ));
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else
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reg_val = chip->reg_output[off / BANK_SZ]
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& ~(1u << (off % BANK_SZ));
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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_single(chip, offset, reg_val, off);
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if (ret)
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goto exit;
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chip->reg_output[off / BANK_SZ] = reg_val;
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/* then direction */
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reg_val = chip->reg_direction[off / BANK_SZ] & ~(1u << (off % BANK_SZ));
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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_single(chip, offset, reg_val, off);
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if (ret)
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goto exit;
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chip->reg_direction[off / BANK_SZ] = reg_val;
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ret = 0;
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exit:
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return ret;
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}
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static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
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{
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struct pca953x_chip *chip = to_pca(gc);
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u8 reg_val;
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reg_val = chip->reg_direction[off / BANK_SZ] & (1u << (off % BANK_SZ));
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if (reg_val)
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return GPIOF_DIR_IN;
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return GPIOF_DIR_OUT;
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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 = to_pca(gc);
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u32 reg_val;
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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_single(chip, offset, ®_val, off);
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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 % BANK_SZ))) ? 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 = to_pca(gc);
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u8 reg_val;
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int ret, offset = 0;
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if (val)
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reg_val = chip->reg_output[off / BANK_SZ]
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| (1u << (off % BANK_SZ));
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else
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reg_val = chip->reg_output[off / BANK_SZ]
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& ~(1u << (off % BANK_SZ));
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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_single(chip, offset, reg_val, off);
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if (ret)
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goto exit;
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chip->reg_output[off / BANK_SZ] = reg_val;
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exit:
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return;
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}
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static struct gpio_ops pca953x_gpio_ops = {
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.direction_input = pca953x_gpio_direction_input,
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.direction_output = pca953x_gpio_direction_output,
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.get_direction = pca953x_gpio_get_direction,
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.get = pca953x_gpio_get_value,
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.set = pca953x_gpio_set_value,
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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->ops = &pca953x_gpio_ops;
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gc->base = chip->gpio_start;
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gc->ngpio = gpios;
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gc->dev = &chip->client->dev;
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}
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static int device_pca953x_init(struct pca953x_chip *chip, u32 invert)
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{
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int ret;
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u8 val[MAX_BANK];
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ret = pca953x_read_regs(chip, PCA953X_OUTPUT, chip->reg_output);
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if (ret)
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goto out;
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ret = pca953x_read_regs(chip, PCA953X_DIRECTION,
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chip->reg_direction);
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if (ret)
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goto out;
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/* set platform specific polarity inversion */
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if (invert)
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memset(val, 0xFF, NBANK(chip));
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else
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memset(val, 0, NBANK(chip));
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ret = pca953x_write_regs(chip, PCA953X_INVERT, val);
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out:
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return ret;
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}
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static int device_pca957x_init(struct pca953x_chip *chip, u32 invert)
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{
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int ret;
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u8 val[MAX_BANK];
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ret = pca953x_read_regs(chip, PCA957X_OUT, chip->reg_output);
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if (ret)
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goto out;
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ret = pca953x_read_regs(chip, PCA957X_CFG, chip->reg_direction);
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if (ret)
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goto out;
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/* set platform specific polarity inversion */
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if (invert)
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memset(val, 0xFF, NBANK(chip));
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else
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memset(val, 0, NBANK(chip));
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pca953x_write_regs(chip, PCA957X_INVRT, val);
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/* To enable register 6, 7 to controll pull up and pull down */
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memset(val, 0x02, NBANK(chip));
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pca953x_write_regs(chip, PCA957X_BKEN, val);
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return 0;
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out:
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return ret;
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}
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static int pca953x_probe(struct device_d *dev)
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{
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struct i2c_client *client = to_i2c_client(dev);
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unsigned long driver_data;
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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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u32 invert = 0;
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chip = xzalloc(sizeof(struct pca953x_chip));
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driver_data = 0;
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pdata = dev->platform_data;
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if (pdata) {
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chip->gpio_start = pdata->gpio_base;
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invert = pdata->invert;
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chip->names = pdata->names;
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} else {
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int err;
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err = dev_get_drvdata(dev, &driver_data);
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if (err)
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return err;
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chip->gpio_start = -1;
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}
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chip->client = client;
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chip->chip_type = driver_data & (PCA953X_TYPE | PCA957X_TYPE);
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/* initialize cached registers from their original values.
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* we can't share this chip with another i2c master.
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*/
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pca953x_setup_gpio(chip, driver_data & PCA_GPIO_MASK);
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if (chip->chip_type == PCA953X_TYPE)
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ret = device_pca953x_init(chip, invert);
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else
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ret = device_pca957x_init(chip, invert);
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if (ret)
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return ret;
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ret = gpiochip_add(&chip->gpio_chip);
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if (ret)
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return ret;
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if (pdata && pdata->setup) {
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ret = pdata->setup(client, chip->gpio_chip.base,
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chip->gpio_chip.ngpio, pdata->context);
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if (ret < 0)
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dev_warn(&client->dev, "setup failed, %d\n", ret);
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}
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return 0;
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}
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static struct driver_d pca953x_driver = {
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.name = "pca953x",
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.probe = pca953x_probe,
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.id_table = pca953x_id,
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};
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static int __init pca953x_init(void)
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{
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return i2c_driver_register(&pca953x_driver);
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}
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device_initcall(pca953x_init);
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