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https://github.com/edk2-porting/linux-next.git
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c6c1933263
Add mfd core driver for TPS6586x PMICs family.
The driver provides I/O access for the sub-device drivers and performs
regstration of the sub-devices based on the platform requirements.
In addition it implements GPIOlib interface for the chip GPIOs.
TODO:
- add interrupt support
- add platform data for PWM, backlight leds and charger
Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
376 lines
8.3 KiB
C
376 lines
8.3 KiB
C
/*
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* Core driver for TI TPS6586x PMIC family
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*
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* Copyright (c) 2010 CompuLab Ltd.
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* Mike Rapoport <mike@compulab.co.il>
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*
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* Based on da903x.c.
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* Copyright (C) 2008 Compulab, Ltd.
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* Mike Rapoport <mike@compulab.co.il>
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* Copyright (C) 2006-2008 Marvell International Ltd.
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* Eric Miao <eric.miao@marvell.com>
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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 version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps6586x.h>
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/* GPIO control registers */
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#define TPS6586X_GPIOSET1 0x5d
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#define TPS6586X_GPIOSET2 0x5e
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/* device id */
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#define TPS6586X_VERSIONCRC 0xcd
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#define TPS658621A_VERSIONCRC 0x15
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struct tps6586x {
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struct mutex lock;
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struct device *dev;
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struct i2c_client *client;
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struct gpio_chip gpio;
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};
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static inline int __tps6586x_read(struct i2c_client *client,
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int reg, uint8_t *val)
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{
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int ret;
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ret = i2c_smbus_read_byte_data(client, reg);
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if (ret < 0) {
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dev_err(&client->dev, "failed reading at 0x%02x\n", reg);
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return ret;
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}
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*val = (uint8_t)ret;
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return 0;
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}
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static inline int __tps6586x_reads(struct i2c_client *client, int reg,
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int len, uint8_t *val)
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{
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int ret;
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ret = i2c_smbus_read_i2c_block_data(client, reg, len, val);
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if (ret < 0) {
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dev_err(&client->dev, "failed reading from 0x%02x\n", reg);
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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 inline int __tps6586x_write(struct i2c_client *client,
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int reg, uint8_t val)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(client, reg, val);
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if (ret < 0) {
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dev_err(&client->dev, "failed writing 0x%02x to 0x%02x\n",
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val, reg);
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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 inline int __tps6586x_writes(struct i2c_client *client, int reg,
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int len, uint8_t *val)
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{
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int ret;
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ret = i2c_smbus_write_i2c_block_data(client, reg, len, val);
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if (ret < 0) {
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dev_err(&client->dev, "failed writings to 0x%02x\n", reg);
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return ret;
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}
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return 0;
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}
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int tps6586x_write(struct device *dev, int reg, uint8_t val)
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{
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return __tps6586x_write(to_i2c_client(dev), reg, val);
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}
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EXPORT_SYMBOL_GPL(tps6586x_write);
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int tps6586x_writes(struct device *dev, int reg, int len, uint8_t *val)
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{
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return __tps6586x_writes(to_i2c_client(dev), reg, len, val);
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}
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EXPORT_SYMBOL_GPL(tps6586x_writes);
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int tps6586x_read(struct device *dev, int reg, uint8_t *val)
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{
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return __tps6586x_read(to_i2c_client(dev), reg, val);
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}
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EXPORT_SYMBOL_GPL(tps6586x_read);
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int tps6586x_reads(struct device *dev, int reg, int len, uint8_t *val)
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{
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return __tps6586x_reads(to_i2c_client(dev), reg, len, val);
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}
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EXPORT_SYMBOL_GPL(tps6586x_reads);
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int tps6586x_set_bits(struct device *dev, int reg, uint8_t bit_mask)
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{
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struct tps6586x *tps6586x = dev_get_drvdata(dev);
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uint8_t reg_val;
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int ret = 0;
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mutex_lock(&tps6586x->lock);
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ret = __tps6586x_read(to_i2c_client(dev), reg, ®_val);
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if (ret)
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goto out;
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if ((reg_val & bit_mask) == 0) {
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reg_val |= bit_mask;
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ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
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}
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out:
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mutex_unlock(&tps6586x->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tps6586x_set_bits);
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int tps6586x_clr_bits(struct device *dev, int reg, uint8_t bit_mask)
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{
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struct tps6586x *tps6586x = dev_get_drvdata(dev);
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uint8_t reg_val;
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int ret = 0;
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mutex_lock(&tps6586x->lock);
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ret = __tps6586x_read(to_i2c_client(dev), reg, ®_val);
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if (ret)
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goto out;
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if (reg_val & bit_mask) {
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reg_val &= ~bit_mask;
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ret = __tps6586x_write(to_i2c_client(dev), reg, reg_val);
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}
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out:
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mutex_unlock(&tps6586x->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tps6586x_clr_bits);
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int tps6586x_update(struct device *dev, int reg, uint8_t val, uint8_t mask)
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{
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struct tps6586x *tps6586x = dev_get_drvdata(dev);
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uint8_t reg_val;
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int ret = 0;
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mutex_lock(&tps6586x->lock);
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ret = __tps6586x_read(tps6586x->client, reg, ®_val);
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if (ret)
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goto out;
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if ((reg_val & mask) != val) {
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reg_val = (reg_val & ~mask) | val;
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ret = __tps6586x_write(tps6586x->client, reg, reg_val);
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}
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out:
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mutex_unlock(&tps6586x->lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(tps6586x_update);
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static int tps6586x_gpio_get(struct gpio_chip *gc, unsigned offset)
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{
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struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
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uint8_t val;
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int ret;
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ret = __tps6586x_read(tps6586x->client, TPS6586X_GPIOSET2, &val);
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if (ret)
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return ret;
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return !!(val & (1 << offset));
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}
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static void tps6586x_gpio_set(struct gpio_chip *chip, unsigned offset,
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int value)
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{
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struct tps6586x *tps6586x = container_of(chip, struct tps6586x, gpio);
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__tps6586x_write(tps6586x->client, TPS6586X_GPIOSET2,
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value << offset);
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}
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static int tps6586x_gpio_output(struct gpio_chip *gc, unsigned offset,
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int value)
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{
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struct tps6586x *tps6586x = container_of(gc, struct tps6586x, gpio);
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uint8_t val, mask;
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tps6586x_gpio_set(gc, offset, value);
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val = 0x1 << (offset * 2);
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mask = 0x3 << (offset * 2);
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return tps6586x_update(tps6586x->dev, TPS6586X_GPIOSET1, val, mask);
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}
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static void tps6586x_gpio_init(struct tps6586x *tps6586x, int gpio_base)
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{
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int ret;
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if (!gpio_base)
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return;
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tps6586x->gpio.owner = THIS_MODULE;
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tps6586x->gpio.label = tps6586x->client->name;
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tps6586x->gpio.dev = tps6586x->dev;
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tps6586x->gpio.base = gpio_base;
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tps6586x->gpio.ngpio = 4;
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tps6586x->gpio.can_sleep = 1;
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/* FIXME: add handling of GPIOs as dedicated inputs */
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tps6586x->gpio.direction_output = tps6586x_gpio_output;
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tps6586x->gpio.set = tps6586x_gpio_set;
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tps6586x->gpio.get = tps6586x_gpio_get;
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ret = gpiochip_add(&tps6586x->gpio);
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if (ret)
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dev_warn(tps6586x->dev, "GPIO registration failed: %d\n", ret);
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}
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static int __remove_subdev(struct device *dev, void *unused)
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{
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platform_device_unregister(to_platform_device(dev));
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return 0;
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}
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static int tps6586x_remove_subdevs(struct tps6586x *tps6586x)
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{
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return device_for_each_child(tps6586x->dev, NULL, __remove_subdev);
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}
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static int __devinit tps6586x_add_subdevs(struct tps6586x *tps6586x,
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struct tps6586x_platform_data *pdata)
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{
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struct tps6586x_subdev_info *subdev;
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struct platform_device *pdev;
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int i, ret = 0;
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for (i = 0; i < pdata->num_subdevs; i++) {
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subdev = &pdata->subdevs[i];
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pdev = platform_device_alloc(subdev->name, subdev->id);
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pdev->dev.parent = tps6586x->dev;
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pdev->dev.platform_data = subdev->platform_data;
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ret = platform_device_add(pdev);
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if (ret)
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goto failed;
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}
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return 0;
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failed:
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tps6586x_remove_subdevs(tps6586x);
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return ret;
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}
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static int __devinit tps6586x_i2c_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tps6586x_platform_data *pdata = client->dev.platform_data;
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struct tps6586x *tps6586x;
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int ret;
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if (!pdata) {
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dev_err(&client->dev, "tps6586x requires platform data\n");
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return -ENOTSUPP;
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}
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ret = i2c_smbus_read_byte_data(client, TPS6586X_VERSIONCRC);
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if (ret < 0) {
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dev_err(&client->dev, "Chip ID read failed: %d\n", ret);
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return -EIO;
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}
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if (ret != TPS658621A_VERSIONCRC) {
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dev_err(&client->dev, "Unsupported chip ID: %x\n", ret);
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return -ENODEV;
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}
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tps6586x = kzalloc(sizeof(struct tps6586x), GFP_KERNEL);
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if (tps6586x == NULL)
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return -ENOMEM;
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tps6586x->client = client;
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tps6586x->dev = &client->dev;
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i2c_set_clientdata(client, tps6586x);
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mutex_init(&tps6586x->lock);
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ret = tps6586x_add_subdevs(tps6586x, pdata);
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if (ret) {
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dev_err(&client->dev, "add devices failed: %d\n", ret);
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goto err_add_devs;
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}
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tps6586x_gpio_init(tps6586x, pdata->gpio_base);
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return 0;
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err_add_devs:
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kfree(tps6586x);
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return ret;
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}
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static int __devexit tps6586x_i2c_remove(struct i2c_client *client)
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{
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return 0;
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}
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static const struct i2c_device_id tps6586x_id_table[] = {
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{ "tps6586x", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, tps6586x_id_table);
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static struct i2c_driver tps6586x_driver = {
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.driver = {
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.name = "tps6586x",
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.owner = THIS_MODULE,
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},
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.probe = tps6586x_i2c_probe,
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.remove = __devexit_p(tps6586x_i2c_remove),
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.id_table = tps6586x_id_table,
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};
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static int __init tps6586x_init(void)
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{
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return i2c_add_driver(&tps6586x_driver);
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}
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subsys_initcall(tps6586x_init);
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static void __exit tps6586x_exit(void)
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{
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i2c_del_driver(&tps6586x_driver);
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}
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module_exit(tps6586x_exit);
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MODULE_DESCRIPTION("TPS6586X core driver");
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MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
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MODULE_LICENSE("GPL");
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