1054 lines
27 KiB
C
1054 lines
27 KiB
C
/*
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* pcal6416a.c - 16 bit I/O port
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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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* Copyright (C) 2013 NXP Semiconductors
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*
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* Derived from drivers/i2c/chips/pca953x.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/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/i2c.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/platform_device.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/regulator/consumer.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#if defined(CONFIG_OF)
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#endif
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#include <linux/i2c/pcal6416a.h>
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#define DRV_NAME "pcal6416a-gpio"
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#define POWER_ON 1
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#define POWER_OFF 0
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struct pcal6416a_chip {
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struct i2c_client *client;
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struct gpio_chip gpio_chip;
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struct dentry *dentry;
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struct mutex lock;
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struct pcal6416a_platform_data *pdata;
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unsigned gpio_start;
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uint16_t reg_output;
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uint16_t reg_polarity;
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uint16_t reg_config;
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uint16_t reg_drive0;
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uint16_t reg_drive1;
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uint16_t reg_inputlatch;
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uint16_t reg_enpullupdown;
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uint16_t reg_selpullupdown;
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uint16_t reg_intmask;
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uint16_t reg_outputconfig;
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};
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struct pcal6416a_chip *g_dev = NULL;
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/* read the 16-bit register from the PCAL6416A
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reg: register address
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val: the value read back from the PCAL6416A
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*/
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static int pcal6416a_read_reg(struct pcal6416a_chip *chip, int reg, uint16_t *val)
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{
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int ret = i2c_smbus_read_word_data(chip->client, reg);
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if (ret < 0) {
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dev_err(&chip->client->dev,
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"failed reading register %d\n", ret);
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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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/* write a 16-bit value to the PCAL6416A
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reg: register address
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val: the value read back from the PCAL6416A
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*/
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static int pcal6416a_write_reg(struct pcal6416a_chip *chip, int reg, uint16_t val)
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{
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int ret = i2c_smbus_write_word_data(chip->client, reg, val);
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if (ret < 0) {
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dev_err(&chip->client->dev,
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"failed writing register %d\n", ret);
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return ret;
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}
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return 0;
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}
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/* read a port pin value (INPUT register) from the PCAL6416A
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off: bit number (0..15)
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return: bit value 0 or 1
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*/
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static int pcal6416a_gpio_get_value(struct gpio_chip *gc, unsigned off)
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{
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uint16_t reg_val;
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int ret;
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struct pcal6416a_chip *chip
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= container_of(gc, struct pcal6416a_chip, gpio_chip);
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ret = pcal6416a_read_reg(chip, PCAL6416A_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 ret;
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}
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return (reg_val & (1u << off)) ? 1 : 0;
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}
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/* write a port pin value (INPUT register) from the PCAL6416A
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off: bit number (0..15)
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val: 0 or 1
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return: none
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*/
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static void pcal6416a_gpio_set_value(struct gpio_chip *gc,
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unsigned off, int val)
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{
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struct pcal6416a_chip *chip
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= container_of(gc, struct pcal6416a_chip, gpio_chip);
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mutex_lock(&chip->lock);
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if (val)
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chip->reg_output |= (1u << off);
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else
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chip->reg_output &= ~(1u << off);
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pcal6416a_write_reg(chip, PCAL6416A_DAT_OUT, chip->reg_output);
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mutex_unlock(&chip->lock);
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}
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/* set the CONFIGURATION register of a port pin as an input
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off: bit number (0..15)
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*/
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static int pcal6416a_gpio_direction_input(struct gpio_chip *gc, unsigned off)
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{
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int ret;
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struct pcal6416a_chip *chip
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= container_of(gc, struct pcal6416a_chip, gpio_chip);
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pr_info("%s(off=[%d])\n", __func__, off);
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mutex_lock(&chip->lock);
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/* input set bit 1 */
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chip->reg_config |= (1u << off);
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ret = pcal6416a_write_reg(chip, PCAL6416A_CONFIG, chip->reg_config);
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mutex_unlock(&chip->lock);
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return ret;
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}
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/* set the DIRECTION (CONFIGURATION register) of a port pin as an output
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off: bit number (0..15)
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val = 1 or 0
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return: 0 if successful
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*/
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static int pcal6416a_gpio_direction_output(struct gpio_chip *gc,
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unsigned off, int val)
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{
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int ret;
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struct pcal6416a_chip *chip
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= container_of(gc, struct pcal6416a_chip, gpio_chip);
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pr_info("%s(off=[%d], val=[%d])\n", __func__, off, val);
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mutex_lock(&chip->lock);
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/* set output level */
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if (val)
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chip->reg_output |= (1u << off);
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else
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chip->reg_output &= ~(1u << off);
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ret = pcal6416a_write_reg(chip, PCAL6416A_DAT_OUT, chip->reg_output);
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/* then direction */
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/* output set bit 0 */
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chip->reg_config &= ~(1u << off);
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ret |= pcal6416a_write_reg(chip, PCAL6416A_CONFIG, chip->reg_config);
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mutex_unlock(&chip->lock);
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return ret;
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}
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static int pcal6416a_gpio_request(struct gpio_chip *gc, unsigned off)
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{
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struct pcal6416a_chip *chip
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= container_of(gc, struct pcal6416a_chip, gpio_chip);
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pr_info("%s\n", __func__);
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if (off >= chip->gpio_chip.ngpio) {
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pr_err("[%s] offset over max = [%d]\n", __func__, off);
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return 1;
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}
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/* to do*/
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return 0;
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}
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static void pcal6416a_gpio_free(struct gpio_chip *gc, unsigned off)
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{
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struct pcal6416a_chip *chip
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= container_of(gc, struct pcal6416a_chip, gpio_chip);
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pr_info("%s\n", __func__);
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if (off >= chip->gpio_chip.ngpio) {
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pr_err("[%s] offset over max = [%d]\n", __func__, off);
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}
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/* to do*/
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}
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#if !defined(CONFIG_ARM64)
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int expander_gpio_config(unsigned config, unsigned disable)
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{
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int ret;
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unsigned min_gpio, max_gpio, offset;
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unsigned gpio = GPIO_PIN(config);
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unsigned dir = GPIO_DIR(config);
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unsigned pull = GPIO_PULL(config);
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unsigned drvstr = GPIO_DRVSTR(config);
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min_gpio = g_dev->gpio_start;
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max_gpio = g_dev->gpio_start + g_dev->gpio_chip.ngpio;
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pr_info("[%s]config gpio [%d]\n", __func__, gpio);
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if (!((min_gpio <= gpio) && (gpio < max_gpio)))
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return -EINVAL;
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offset = gpio-min_gpio;
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if (dir) { /* output */
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pcal6416a_gpio_direction_output(&g_dev->gpio_chip, offset, 0);
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} else {
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pcal6416a_gpio_direction_input(&g_dev->gpio_chip, offset);
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}
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switch (pull) { /* pull-up, pull-down, no-pull */
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case GPIO_CFG_NO_PULL:
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g_dev->reg_enpullupdown &= ~(1<<offset);
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g_dev->reg_selpullupdown &= ~(1<<offset);
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break;
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case GPIO_CFG_PULL_DOWN:
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g_dev->reg_enpullupdown |= (1<<offset);
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g_dev->reg_selpullupdown &= ~(1<<offset);
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break;
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case GPIO_CFG_PULL_UP:
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g_dev->reg_enpullupdown |= (1<<offset);
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g_dev->reg_selpullupdown |= (1<<offset);
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break;
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default:
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pr_err("Not support config - GPIO_CFG_KEEPER\n");
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break;
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}
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ret = pcal6416a_write_reg(g_dev, PCAL6416A_EN_PULLUPDOWN,
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g_dev->reg_enpullupdown);
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if (ret < 0)
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pr_err("failed set enable pullupdown\n");
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ret = pcal6416a_write_reg(g_dev, PCAL6416A_SEL_PULLUPDOWN,
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g_dev->reg_selpullupdown);
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if (ret < 0)
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pr_err("failed set select pull\n");
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if (offset < 8) { /* p0 ~ p7 */
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switch (drvstr) {
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case GPIO_CFG_6_25MA:
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g_dev->reg_drive0 &= ~(0x3<<(offset*2));
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break;
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case GPIO_CFG_12_5MA:
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g_dev->reg_drive0 &= ~(0x3<<(offset*2));
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g_dev->reg_drive0 |= (0x1<<(offset*2));
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break;
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case GPIO_CFG_18_75MA:
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g_dev->reg_drive0 &= ~(0x3<<(offset*2));
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g_dev->reg_drive0 |= (0x2<<(offset*2));
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break;
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case GPIO_CFG_25MA:
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g_dev->reg_drive0 |= (0x3<<(offset*2));
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break;
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default:
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pr_err("Not support config - drive strength\n");
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break;
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}
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ret = pcal6416a_write_reg(g_dev, PCAL6416A_DRIVE0,
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g_dev->reg_drive0);
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if (ret < 0)
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pr_err("failed set drive0\n");
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} else {
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switch (drvstr) {
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case GPIO_CFG_6_25MA:
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g_dev->reg_drive1 &= ~(0x3<<((offset-8)*2));
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break;
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case GPIO_CFG_12_5MA:
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g_dev->reg_drive1 &= ~(0x3<<((offset-8)*2));
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g_dev->reg_drive1 |= (0x1<<((offset-8)*2));
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break;
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case GPIO_CFG_18_75MA:
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g_dev->reg_drive1 &= ~(0x3<<((offset-8)*2));
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g_dev->reg_drive1 |= (0x2<<((offset-8)*2));
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break;
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case GPIO_CFG_25MA:
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g_dev->reg_drive1 |= (0x3<<((offset-8)*2));
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break;
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default:
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pr_err("Not support config - drive strength\n");
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break;
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}
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ret = pcal6416a_write_reg(g_dev, PCAL6416A_DRIVE1,
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g_dev->reg_drive1);
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if (ret < 0)
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pr_err("failed set drive1\n");
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}
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return 0;
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}
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EXPORT_SYMBOL(expander_gpio_config);
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#endif
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static int pcal6416a_gpio_setup(struct pcal6416a_chip *dev)
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{
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int ret;
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uint16_t read_val;
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pr_info("[%s] GPIO Expander Init setting\n", __func__);
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dev->reg_outputconfig = 0x0000;
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ret = pcal6416a_write_reg(dev, PCAL6416A_OUTPUT_CONFIG,
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dev->reg_outputconfig); /* push-pull */
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if (ret < 0) {
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pr_err("failed set output config\n");
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return ret;
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}
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ret = pcal6416a_write_reg(dev, PCAL6416A_DAT_OUT,
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dev->reg_output); /* 1 : output high, 0 : output low */
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if (ret < 0) {
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pr_err("failed set data out\n");
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return ret;
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}
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ret = pcal6416a_write_reg(dev, PCAL6416A_CONFIG,
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dev->reg_config); /* 1 : input, 0 : output */
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if (ret < 0) {
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pr_err("failed set config\n");
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return ret;
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}
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dev->reg_polarity = 0x0000;
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ret = pcal6416a_write_reg(dev, PCAL6416A_POLARITY,
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dev->reg_polarity);
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if (ret < 0) {
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pr_err("failed set polarity\n");
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return ret;
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}
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dev->reg_drive0 = 0x0000;
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ret = pcal6416a_write_reg(dev, PCAL6416A_DRIVE0,
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dev->reg_drive0); /* drive 0.25x */
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if (ret < 0) {
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pr_err("failed set drive0\n");
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return ret;
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}
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dev->reg_drive1 = 0x0000;
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ret = pcal6416a_write_reg(dev, PCAL6416A_DRIVE1,
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dev->reg_drive1); /* drive 0.25x */
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if (ret < 0) {
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pr_err("failed set drive1\n");
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return ret;
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}
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dev->reg_inputlatch = 0x0000;
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ret = pcal6416a_write_reg(dev, PCAL6416A_INPUT_LATCH,
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dev->reg_inputlatch); /* not use latch */
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if (ret < 0) {
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pr_err("failed set input latch\n");
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return ret;
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}
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ret = pcal6416a_write_reg(dev, PCAL6416A_EN_PULLUPDOWN,
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dev->reg_enpullupdown); /* 1 : enable, 0 : disable */
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if (ret < 0) {
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pr_err("failed set enable pullupdown\n");
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return ret;
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}
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ret = pcal6416a_write_reg(dev, PCAL6416A_SEL_PULLUPDOWN,
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dev->reg_selpullupdown); /* 1 : pull-up, 0 : pull-down */
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if (ret < 0) {
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pr_err("failed set select pull\n");
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return ret;
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}
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dev->reg_intmask = 0xFFFF;
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ret = pcal6416a_write_reg(dev, PCAL6416A_INT_MASK,
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dev->reg_intmask); /* not use int */
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if (ret < 0) {
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pr_err("failed set int mask\n");
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return ret;
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}
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ret = pcal6416a_read_reg(dev, PCAL6416A_INT_MASK,
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&read_val);
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if (ret < 0) {
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pr_err("failed read int mask\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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#ifdef CONFIG_OF
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static int pcal6416a_parse_dt(struct device *dev,
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struct pcal6416a_platform_data *pdata)
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{
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struct device_node *np = dev->of_node;
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struct pinctrl *reset_pinctrl;
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int ret, i;
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u32 pull_reg;
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ret = of_property_read_u32(np, "pcal6416a,gpio_start", &pdata->gpio_start);
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if (ret < 0) {
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pr_err("[%s]: Unable to read pcal6416a,gpio_start\n", __func__);
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return ret;
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}
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ret = of_property_read_u32(np, "pcal6416a,ngpio", &pdata->ngpio);
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if (ret < 0) {
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pr_err("[%s]: Unable to read pcal6416a,ngpio\n", __func__);
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return ret;
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}
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pdata->reset_gpio = of_get_named_gpio(np, "pcal6416a,reset-gpio", 0);
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/* Get pinctrl if target uses pinctrl */
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reset_pinctrl = devm_pinctrl_get_select(dev, "expander_reset_setting");
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if (IS_ERR(reset_pinctrl)) {
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if (PTR_ERR(reset_pinctrl) == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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pr_debug("Target does not use pinctrl\n");
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reset_pinctrl = NULL;
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}
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ret = of_property_read_u32(np, "pcal6416a,support_initialize", (u32 *)&pdata->support_init);
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if (ret < 0) {
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pr_err("[%s]: Unable to read pcal6416a,support_init\n", __func__);
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pdata->support_init = 0;
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}
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pdata->vdd = devm_regulator_get(dev, "pcal6416a,vdd");
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if (IS_ERR(pdata->vdd)) {
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pr_err("%s: cannot get pcal6416a,vdd\n", __func__);
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ret = -ENOMEM;
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return ret;
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} else if (!regulator_get_voltage(pdata->vdd)) {
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ret = regulator_set_voltage(pdata->vdd, 1800000, 1800000);
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}
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if (pdata->support_init) {
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ret = of_property_read_u32(np, "pcal6416a,config", (u32 *)&pdata->init_config);
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if (ret < 0) {
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pr_err("[%s]: Unable to read pcal6416a,support_init\n", __func__);
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pdata->init_config= 0x0000;
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}
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ret = of_property_read_u32(np, "pcal6416a,data_out", (u32 *)&pdata->init_data_out);
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if (ret < 0) {
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pr_err("[%s]: Unable to read pcal6416a,support_init\n", __func__);
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pdata->init_data_out = 0x0000;
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}
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ret = of_property_read_u32(np, "pcal6416a,pull_reg", &pull_reg);
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if (ret < 0) {
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pr_err("[%s]: Unable to read pcal6416a,pull_reg\n", __func__);
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pdata->init_en_pull = 0x0000;
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pdata->init_sel_pull = 0x0000;
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}
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pr_info("[%s] 0x%08x\n", __func__, pull_reg);
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pdata->init_en_pull = 0x0000;
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pdata->init_sel_pull = 0x0000;
|
|
for (i = 0; i < 16; i++) {
|
|
if (((pull_reg>>(i*2))&0x3) == NO_PULL) {
|
|
pdata->init_en_pull &= ~(1<<i);
|
|
pdata->init_sel_pull &= ~(1<<i);
|
|
}
|
|
else if (((pull_reg>>(i*2))&0x3) == PULL_DOWN) {
|
|
pdata->init_en_pull |= (1<<i);
|
|
pdata->init_sel_pull &= ~(1<<i);
|
|
}
|
|
else if (((pull_reg>>(i*2))&0x3) == PULL_UP) {
|
|
pdata->init_en_pull |= (1<<i);
|
|
pdata->init_sel_pull |= (1<<i);
|
|
}
|
|
}
|
|
} else {
|
|
pdata->init_config = 0x0000;
|
|
pdata->init_data_out = 0x0400;
|
|
pdata->init_en_pull = 0x0000;
|
|
pdata->init_sel_pull = 0x0000;
|
|
}
|
|
|
|
pr_info("[%s] initialize reg 0x%04x 0x%04x 0x%04x 0x%04x\n", __func__,
|
|
pdata->init_config, pdata->init_data_out,
|
|
pdata->init_en_pull, pdata->init_sel_pull);
|
|
dev->platform_data = pdata;
|
|
pr_info("[%s]gpio_start=[%d]ngpio=[%d]reset-gpio=[%d]\n",
|
|
__func__, pdata->gpio_start, pdata->ngpio,
|
|
pdata->reset_gpio);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static void pcal6416a_power_ctrl(struct pcal6416a_platform_data *pdata, char enable)
|
|
{
|
|
int ret = 0;
|
|
struct regulator *reg_power = pdata->vdd;
|
|
|
|
if (enable) {
|
|
if (regulator_is_enabled(reg_power))
|
|
pr_err("%s: power regulator(1.8V) is enabled\n", __func__);
|
|
else
|
|
ret = regulator_enable(reg_power);
|
|
if (ret) {
|
|
pr_err("%s: power regulator enable failed, rc=%d\n",
|
|
__func__, ret);
|
|
return;
|
|
}
|
|
pr_info("%s: gpio expander 1.8V on is finished.\n", __func__);
|
|
} else {
|
|
if (regulator_is_enabled(reg_power))
|
|
ret = regulator_disable(reg_power);
|
|
else
|
|
pr_err("%s: power regulator(1.8V) is disabled\n", __func__);
|
|
if (ret) {
|
|
pr_err("%s: disable power regulator failed, rc=%d\n",
|
|
__func__, ret);
|
|
return;
|
|
}
|
|
pr_info("%s: gpio expander 1.8V off is finished.\n", __func__);
|
|
}
|
|
pr_err("[pcal6416a gpio expander] %s enable(%d)\n", __func__, enable);
|
|
return;
|
|
}
|
|
|
|
static int pcal6416a_reset_chip(struct pcal6416a_platform_data *pdata)
|
|
{
|
|
int retval;
|
|
int reset_gpio = pdata->reset_gpio;
|
|
|
|
if (gpio_is_valid(reset_gpio)) {
|
|
retval = gpio_request(reset_gpio,
|
|
"pcal6416a_reset_gpio");
|
|
if (retval) {
|
|
pr_err("[%s]: unable to request gpio [%d]\n",
|
|
__func__, reset_gpio);
|
|
return retval;
|
|
}
|
|
|
|
retval = gpio_direction_output(reset_gpio, 1);
|
|
if (retval) {
|
|
pr_err("[%s]: unable to set direction for gpio [%d]\n",
|
|
__func__, reset_gpio);
|
|
gpio_free(reset_gpio);
|
|
return retval;
|
|
}
|
|
|
|
usleep(100);
|
|
gpio_set_value(reset_gpio, 0);
|
|
usleep(100);
|
|
gpio_set_value(reset_gpio, 1);
|
|
pr_info("[%s]: gpio expander reset.\n", __func__);
|
|
|
|
gpio_free(reset_gpio);
|
|
return 0;
|
|
} else {
|
|
pr_err("[%s]: gpio_is_valid fail\n", __func__);
|
|
return -EIO;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct device *pcal6416a_dev;
|
|
extern struct class *sec_class;
|
|
|
|
static ssize_t store_pcal6416a_gpio_inout(struct device *dev,
|
|
struct device_attribute *devattr,
|
|
const char *buf, size_t count)
|
|
{
|
|
int retval, off, val, gpio_pcal6416a;
|
|
char in_out, msg[13];
|
|
struct pcal6416a_chip *data = dev_get_drvdata(dev);
|
|
|
|
retval = sscanf(buf, "%1c %3d %1d", &in_out, &off, &val);
|
|
if (retval == 0) {
|
|
dev_err(&data->client->dev, "[%s] fail to pcal6416a out.\n", __func__);
|
|
return count;
|
|
}
|
|
if (!(in_out == 'i' || in_out == 'o')) {
|
|
pr_err("[%s] wrong in_out value [%c]\n", __func__, in_out);
|
|
return count;
|
|
}
|
|
if ((off < 0) || (off > 15)) {
|
|
pr_err("[%s] wrong offset value [%d]\n", __func__, off);
|
|
return count;
|
|
}
|
|
if (!(val == 0 || val == 1)) {
|
|
pr_err("[%s] wrong val value [%d]\n", __func__, val);
|
|
return count;
|
|
}
|
|
|
|
gpio_pcal6416a = data->gpio_start + off;
|
|
snprintf(msg, sizeof(msg)/sizeof(char), "exp-gpio%d\n", off);
|
|
if (gpio_is_valid(gpio_pcal6416a)) {
|
|
retval = gpio_request(gpio_pcal6416a, msg);
|
|
if (retval) {
|
|
pr_err("[%s] unable to request gpio=[%d] err=[%d]\n",
|
|
__func__, gpio_pcal6416a, retval);
|
|
return count;
|
|
}
|
|
|
|
if (in_out == 'i') {
|
|
retval = gpio_direction_input(gpio_pcal6416a);
|
|
val = gpio_get_value(gpio_pcal6416a);
|
|
}
|
|
else
|
|
retval = gpio_direction_output(gpio_pcal6416a, val);
|
|
|
|
if (retval)
|
|
pr_err("%s: unable to set direction for gpio [%d]\n",
|
|
__func__, gpio_pcal6416a);
|
|
|
|
gpio_free(gpio_pcal6416a);
|
|
}
|
|
|
|
pr_info("pcal6416a mode set to dir[%c], offset[%d], val[%d]\n", in_out, off, val);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t show_pcal6416a_gpio_state(struct device *dev,
|
|
struct device_attribute *devattr, char *buf)
|
|
{
|
|
struct pcal6416a_chip *chip = dev_get_drvdata(dev);
|
|
struct pcal6416a_chip chip_state;
|
|
int i, drv_str;
|
|
uint16_t read_input;
|
|
char *bufp = buf;
|
|
|
|
pcal6416a_read_reg(chip, PCAL6416A_INPUT, &read_input);
|
|
pcal6416a_read_reg(chip, PCAL6416A_DAT_OUT, &chip_state.reg_output);
|
|
pcal6416a_read_reg(chip, PCAL6416A_CONFIG, &chip_state.reg_config);
|
|
pcal6416a_read_reg(chip, PCAL6416A_DRIVE0, &chip_state.reg_drive0);
|
|
pcal6416a_read_reg(chip, PCAL6416A_DRIVE1, &chip_state.reg_drive1);
|
|
pcal6416a_read_reg(chip, PCAL6416A_EN_PULLUPDOWN,
|
|
&chip_state.reg_enpullupdown);
|
|
pcal6416a_read_reg(chip, PCAL6416A_SEL_PULLUPDOWN,
|
|
&chip_state.reg_selpullupdown);
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
bufp += sprintf(bufp, "Expander[3%02d]", i);
|
|
if ((chip_state.reg_config>>i)&0x1)
|
|
bufp += sprintf(bufp, " IN");
|
|
else {
|
|
if ((chip_state.reg_output>>i)&0x1)
|
|
bufp += sprintf(bufp, " OUT_HIGH");
|
|
else
|
|
bufp += sprintf(bufp, " OUT_LOW");
|
|
}
|
|
if ((chip_state.reg_enpullupdown>>i)&0x1) {
|
|
if ((chip_state.reg_selpullupdown>>i)&0x1)
|
|
bufp += sprintf(bufp, " PULL_UP");
|
|
else
|
|
bufp += sprintf(bufp, " PULL_DOWN");
|
|
} else
|
|
bufp += sprintf(bufp, " PULL_NONE");
|
|
if (i > 7)
|
|
drv_str = (chip_state.reg_drive1>>((i-8)*2)) & 0x3;
|
|
else
|
|
drv_str = (chip_state.reg_drive0>>(i*2)) & 0x3;
|
|
switch(drv_str) {
|
|
case GPIO_CFG_6_25MA:
|
|
bufp += sprintf(bufp, " DRV_6.25mA");
|
|
break;
|
|
case GPIO_CFG_12_5MA:
|
|
bufp += sprintf(bufp, " DRV_12.5mA");
|
|
break;
|
|
case GPIO_CFG_18_75MA:
|
|
bufp += sprintf(bufp, " DRV_18.75mA");
|
|
break;
|
|
case GPIO_CFG_25MA:
|
|
bufp += sprintf(bufp, " DRV_25mA");
|
|
break;
|
|
}
|
|
if ((read_input>>i)&0x1)
|
|
bufp += sprintf(bufp, " VAL_HIGH\n");
|
|
else
|
|
bufp += sprintf(bufp, " VAL_LOW\n");
|
|
}
|
|
|
|
return strlen(buf);
|
|
}
|
|
|
|
static DEVICE_ATTR(expgpio, 0664,
|
|
show_pcal6416a_gpio_state, store_pcal6416a_gpio_inout);
|
|
|
|
#ifdef CONFIG_SEC_PM_DEBUG
|
|
int expander_print_all(void)
|
|
{
|
|
struct pcal6416a_chip chip_state;
|
|
int i, drv_str;
|
|
uint16_t read_input;
|
|
|
|
if (!g_dev)
|
|
return -ENODEV;
|
|
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_INPUT, &read_input);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_DAT_OUT, &chip_state.reg_output);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_CONFIG, &chip_state.reg_config);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_DRIVE0, &chip_state.reg_drive0);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_DRIVE1, &chip_state.reg_drive1);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_EN_PULLUPDOWN,
|
|
&chip_state.reg_enpullupdown);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_SEL_PULLUPDOWN,
|
|
&chip_state.reg_selpullupdown);
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
pr_cont("Expander[3%02d]", i);
|
|
if ((chip_state.reg_config>>i)&0x1)
|
|
pr_cont("\tIN");
|
|
else {
|
|
if ((chip_state.reg_output>>i)&0x1)
|
|
pr_cont("\tOUT_HIGH");
|
|
else
|
|
pr_cont("\tOUT_LOW");
|
|
}
|
|
if ((chip_state.reg_enpullupdown>>i)&0x1) {
|
|
if ((chip_state.reg_selpullupdown>>i)&0x1)
|
|
pr_cont("\tPULL_UP");
|
|
else
|
|
pr_cont("\tPULL_DOWN");
|
|
} else
|
|
pr_cont("\tPULL_NONE");
|
|
if (i > 7)
|
|
drv_str = (chip_state.reg_drive1>>((i-8)*2)) & 0x3;
|
|
else
|
|
drv_str = (chip_state.reg_drive0>>(i*2)) & 0x3;
|
|
switch (drv_str) {
|
|
case GPIO_CFG_6_25MA:
|
|
pr_cont("\tDRV_6.25mA");
|
|
break;
|
|
case GPIO_CFG_12_5MA:
|
|
pr_cont("\tDRV_12.5mA");
|
|
break;
|
|
case GPIO_CFG_18_75MA:
|
|
pr_cont("\tDRV_18.75mA");
|
|
break;
|
|
case GPIO_CFG_25MA:
|
|
pr_cont("\tDRV_25mA");
|
|
break;
|
|
}
|
|
if ((read_input>>i)&0x1)
|
|
pr_cont("\tVAL_HIGH\n");
|
|
else
|
|
pr_cont("\tVAL_LOW\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int expander_show(struct seq_file *s, void *unused)
|
|
{
|
|
struct pcal6416a_chip chip_state;
|
|
int i, drv_str;
|
|
uint16_t read_input;
|
|
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_INPUT, &read_input);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_DAT_OUT, &chip_state.reg_output);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_CONFIG, &chip_state.reg_config);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_DRIVE0, &chip_state.reg_drive0);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_DRIVE1, &chip_state.reg_drive1);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_EN_PULLUPDOWN,
|
|
&chip_state.reg_enpullupdown);
|
|
pcal6416a_read_reg(g_dev, PCAL6416A_SEL_PULLUPDOWN,
|
|
&chip_state.reg_selpullupdown);
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
seq_printf(s, "Expander[3%02d]", i);
|
|
if ((chip_state.reg_config>>i)&0x1)
|
|
seq_printf(s, " IN");
|
|
else {
|
|
if ((chip_state.reg_output>>i)&0x1)
|
|
seq_printf(s, " OUT_HIGH");
|
|
else
|
|
seq_printf(s, " OUT_LOW");
|
|
}
|
|
if ((chip_state.reg_enpullupdown>>i)&0x1) {
|
|
if ((chip_state.reg_selpullupdown>>i)&0x1)
|
|
seq_printf(s, " PULL_UP");
|
|
else
|
|
seq_printf(s, " PULL_DOWN");
|
|
} else
|
|
seq_printf(s, " PULL_NONE");
|
|
if (i > 7)
|
|
drv_str = (chip_state.reg_drive1>>((i-8)*2)) & 0x3;
|
|
else
|
|
drv_str = (chip_state.reg_drive0>>(i*2)) & 0x3;
|
|
switch(drv_str) {
|
|
case GPIO_CFG_6_25MA:
|
|
seq_printf(s, " DRV_6.25mA");
|
|
break;
|
|
case GPIO_CFG_12_5MA:
|
|
seq_printf(s, " DRV_12.5mA");
|
|
break;
|
|
case GPIO_CFG_18_75MA:
|
|
seq_printf(s, " DRV_18.75mA");
|
|
break;
|
|
case GPIO_CFG_25MA:
|
|
seq_printf(s, " DRV_25mA");
|
|
break;
|
|
}
|
|
if ((read_input>>i)&0x1)
|
|
seq_printf(s, " VAL_HIGH\n");
|
|
else
|
|
seq_printf(s, " VAL_LOW\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
static int expander_debug_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, expander_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations expander_operations = {
|
|
.open = expander_debug_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int pcal6416a_gpio_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct device_node *np = client->dev.of_node;
|
|
struct pcal6416a_platform_data *pdata = NULL;
|
|
struct pcal6416a_chip *dev;
|
|
struct gpio_chip *gc;
|
|
struct dentry *debugfs_file;
|
|
int ret;
|
|
int retry;
|
|
|
|
pr_info("[%s]\n", __func__);
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_BYTE_DATA)) {
|
|
dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
|
|
return -EIO;
|
|
}
|
|
#ifdef CONFIG_OF
|
|
if (np) {
|
|
pdata = devm_kzalloc(&client->dev,
|
|
sizeof(struct pcal6416a_platform_data),
|
|
GFP_KERNEL);
|
|
if (!pdata) {
|
|
dev_err(&client->dev, "Failed to allocate memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ret = pcal6416a_parse_dt(&client->dev, pdata);
|
|
if (ret) {
|
|
pr_err("[%s] pcal6416a parse dt failed\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
} else {
|
|
pdata = client->dev.platform_data;
|
|
pr_info("GPIO Expender failed to align dtsi %s",
|
|
__func__);
|
|
}
|
|
#else
|
|
pdata = client->dev.platform_data;
|
|
#endif
|
|
if (pdata == NULL) {
|
|
dev_err(&client->dev, "missing platform data\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
pcal6416a_power_ctrl(pdata, POWER_ON);
|
|
|
|
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
|
|
if (dev == NULL) {
|
|
dev_err(&client->dev, "failed to alloc memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev->client = client;
|
|
dev->pdata = pdata;
|
|
dev->gpio_start = pdata->gpio_start;
|
|
|
|
gc = &dev->gpio_chip;
|
|
gc->direction_input = pcal6416a_gpio_direction_input;
|
|
gc->direction_output = pcal6416a_gpio_direction_output;
|
|
gc->get = pcal6416a_gpio_get_value;
|
|
gc->set = pcal6416a_gpio_set_value;
|
|
gc->request = pcal6416a_gpio_request;
|
|
gc->free = pcal6416a_gpio_free;
|
|
gc->can_sleep = 0;
|
|
/*Require dev to use the of_gpio api*/
|
|
gc->dev = &client->dev;
|
|
|
|
gc->base = pdata->gpio_start;
|
|
gc->ngpio = pdata->ngpio;
|
|
gc->label = client->name;
|
|
gc->owner = THIS_MODULE;
|
|
|
|
mutex_init(&dev->lock);
|
|
|
|
dev->reg_config = pdata->init_config;
|
|
dev->reg_output = pdata->init_data_out;
|
|
dev->reg_enpullupdown = pdata->init_en_pull;
|
|
dev->reg_selpullupdown = pdata->init_sel_pull;
|
|
|
|
retry = 0;
|
|
while (1) {
|
|
ret = pcal6416a_reset_chip(pdata);
|
|
if (ret) {
|
|
pr_err("[%s]reset control fail\n", __func__);
|
|
} else {
|
|
ret = pcal6416a_gpio_setup(dev);
|
|
if (ret) {
|
|
dev_err(&client->dev,
|
|
"expander setup i2c retry [%d]\n", retry);
|
|
} else {
|
|
pr_info("[%s]Expander setup success [%d]\n",
|
|
__func__, retry);
|
|
break;
|
|
}
|
|
}
|
|
if (retry++ > 5) {
|
|
dev_err(&client->dev,
|
|
"Failed to expander retry[%d]\n", retry);
|
|
WARN_ON(ret);
|
|
goto err;
|
|
}
|
|
usleep_range(100, 200);
|
|
}
|
|
|
|
ret = gpiochip_add(&dev->gpio_chip);
|
|
if (ret)
|
|
goto err;
|
|
|
|
dev_info(&client->dev, "gpios %d..%d on a %s\n",
|
|
gc->base, gc->base + gc->ngpio - 1,
|
|
client->name);
|
|
|
|
pcal6416a_dev = device_create(sec_class, NULL, 0, dev, "expander");
|
|
if (IS_ERR(pcal6416a_dev)) {
|
|
dev_err(&client->dev,
|
|
"Failed to create device for expander\n");
|
|
ret = -ENODEV;
|
|
goto err;
|
|
}
|
|
|
|
ret = sysfs_create_file(&pcal6416a_dev->kobj, &dev_attr_expgpio.attr);
|
|
if (ret) {
|
|
dev_err(&client->dev,
|
|
"Failed to create sysfs group for expander\n");
|
|
goto err_destroy;
|
|
}
|
|
|
|
dev->dentry = debugfs_create_dir("expander", NULL);
|
|
if (IS_ERR_OR_NULL(dev->dentry)) {
|
|
dev_err(&client->dev,
|
|
"Failed to create debugfs dir for expander\n");
|
|
goto err_debug_dir;
|
|
|
|
}
|
|
debugfs_file = debugfs_create_file("gpio", S_IFREG | S_IRUGO,
|
|
dev->dentry, NULL, &expander_operations);
|
|
if (IS_ERR_OR_NULL(debugfs_file)) {
|
|
dev_err(&client->dev,
|
|
"Failed to create debugfs file for gpio\n");
|
|
goto err_debug_file;
|
|
}
|
|
|
|
i2c_set_clientdata(client, dev);
|
|
g_dev = dev;
|
|
|
|
return 0;
|
|
|
|
err_debug_file:
|
|
debugfs_remove_recursive(dev->dentry);
|
|
err_debug_dir:
|
|
sysfs_remove_file(&pcal6416a_dev->kobj, &dev_attr_expgpio.attr);
|
|
err_destroy:
|
|
device_destroy(sec_class, 0);
|
|
err:
|
|
pcal6416a_power_ctrl(pdata, POWER_OFF);
|
|
mutex_destroy(&dev->lock);
|
|
kfree(dev);
|
|
return ret;
|
|
}
|
|
|
|
static int pcal6416a_gpio_remove(struct i2c_client *client)
|
|
{
|
|
struct pcal6416a_chip *dev = i2c_get_clientdata(client);
|
|
int ret;
|
|
|
|
pcal6416a_power_ctrl(dev->pdata, POWER_OFF);
|
|
ret = gpiochip_remove(&dev->gpio_chip);
|
|
if (ret) {
|
|
dev_err(&client->dev, "gpiochip_remove failed %d\n", ret);
|
|
return ret;
|
|
}
|
|
if (!IS_ERR_OR_NULL(dev->dentry))
|
|
debugfs_remove_recursive(dev->dentry);
|
|
sysfs_remove_file(&pcal6416a_dev->kobj, &dev_attr_expgpio.attr);
|
|
mutex_destroy(&dev->lock);
|
|
kfree(dev);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct of_device_id pcal6416a_dt_ids[] = {
|
|
{ .compatible = "pcal6416a,gpio-expander",},
|
|
};
|
|
#endif
|
|
static const struct i2c_device_id pcal6416a_gpio_id[] = {
|
|
{DRV_NAME, 0, },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, pcal6416a_gpio_id);
|
|
|
|
static struct i2c_driver pcal6416a_gpio_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
#ifdef CONFIG_OF
|
|
.of_match_table = of_match_ptr(pcal6416a_dt_ids),
|
|
#endif
|
|
},
|
|
.probe = pcal6416a_gpio_probe,
|
|
.remove = pcal6416a_gpio_remove,
|
|
.id_table = pcal6416a_gpio_id,
|
|
};
|
|
|
|
static int __init pcal6416a_gpio_init(void)
|
|
{
|
|
return i2c_add_driver(&pcal6416a_gpio_driver);
|
|
}
|
|
|
|
subsys_initcall(pcal6416a_gpio_init);
|
|
|
|
static void __exit pcal6416a_gpio_exit(void)
|
|
{
|
|
i2c_del_driver(&pcal6416a_gpio_driver);
|
|
}
|
|
|
|
module_exit(pcal6416a_gpio_exit);
|
|
|
|
MODULE_DESCRIPTION("GPIO expander driver for PCAL6416A");
|
|
MODULE_LICENSE("GPL");
|