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i2c: cbus-gpio: Switch to use GPIO descriptors 

This augments the CBUS GPIO I2C driver to use GPIO
descriptors for clock, sel and data. We drop the platform
data that was only used for carrying GPIO numbers and
use machine descriptor tables instead.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Linus Walleij 2019-02-06 08:16:51 +01:00 committed by Wolfram Sang
parent d0051ca584
commit 2e5a662de3
3 changed files with 40 additions and 85 deletions
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18
arch/arm/mach-omap1/board-nokia770.c
View File

@ -10,6 +10,7 @@
#include <linux/clkdev.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/gpio/machine.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mutex.h>
@ -25,7 +26,6 @@
#include <linux/platform_data/keypad-omap.h>
#include <linux/platform_data/lcd-mipid.h>
#include <linux/platform_data/gpio-omap.h>
#include <linux/platform_data/i2c-cbus-gpio.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
@ -217,18 +217,19 @@ static inline void nokia770_mmc_init(void)
#endif
#if IS_ENABLED(CONFIG_I2C_CBUS_GPIO)
static struct i2c_cbus_platform_data nokia770_cbus_data = {
.clk_gpio = OMAP_MPUIO(9),
.dat_gpio = OMAP_MPUIO(10),
.sel_gpio = OMAP_MPUIO(11),
static struct gpiod_lookup_table nokia770_cbus_gpio_table = {
.dev_id = "i2c-cbus-gpio.2",
.table = {
GPIO_LOOKUP_IDX("mpuio", 9, NULL, 0, 0), /* clk */
GPIO_LOOKUP_IDX("mpuio", 10, NULL, 1, 0), /* dat */
GPIO_LOOKUP_IDX("mpuio", 11, NULL, 2, 0), /* sel */
{ },
},
};
static struct platform_device nokia770_cbus_device = {
.name = "i2c-cbus-gpio",
.id = 2,
.dev = {
.platform_data = &nokia770_cbus_data,
},
};
static struct i2c_board_info nokia770_i2c_board_info_2[] __initdata = {
@ -257,6 +258,7 @@ static void __init nokia770_cbus_init(void)
nokia770_i2c_board_info_2[1].irq = gpio_to_irq(tahvo_irq_gpio);
i2c_register_board_info(2, nokia770_i2c_board_info_2,
ARRAY_SIZE(nokia770_i2c_board_info_2));
gpiod_add_lookup_table(&nokia770_cbus_gpio_table);
platform_device_register(&nokia770_cbus_device);
}
#else /* CONFIG_I2C_CBUS_GPIO */

80
drivers/i2c/busses/i2c-cbus-gpio.c
View File

@ -18,16 +18,14 @@
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/gpio.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/platform_data/i2c-cbus-gpio.h>
/*
* Bit counts are derived from Nokia implementation. These should be checked
@ -39,9 +37,9 @@
struct cbus_host {
spinlock_t lock; /* host lock */
struct device *dev;
int clk_gpio;
int dat_gpio;
int sel_gpio;
struct gpio_desc *clk;
struct gpio_desc *dat;
struct gpio_desc *sel;
};
/**
@ -51,9 +49,9 @@ struct cbus_host {
*/
static void cbus_send_bit(struct cbus_host *host, unsigned bit)
{
gpio_set_value(host->dat_gpio, bit ? 1 : 0);
gpio_set_value(host->clk_gpio, 1);
gpio_set_value(host->clk_gpio, 0);
gpiod_set_value(host->dat, bit ? 1 : 0);
gpiod_set_value(host->clk, 1);
gpiod_set_value(host->clk, 0);
}
/**
@ -78,9 +76,9 @@ static int cbus_receive_bit(struct cbus_host *host)
{
int ret;
gpio_set_value(host->clk_gpio, 1);
ret = gpio_get_value(host->dat_gpio);
gpio_set_value(host->clk_gpio, 0);
gpiod_set_value(host->clk, 1);
ret = gpiod_get_value(host->dat);
gpiod_set_value(host->clk, 0);
return ret;
}
@ -123,10 +121,10 @@ static int cbus_transfer(struct cbus_host *host, char rw, unsigned dev,
spin_lock_irqsave(&host->lock, flags);
/* Reset state and start of transfer, SEL stays down during transfer */
gpio_set_value(host->sel_gpio, 0);
gpiod_set_value(host->sel, 0);
/* Set the DAT pin to output */
gpio_direction_output(host->dat_gpio, 1);
gpiod_direction_output(host->dat, 1);
/* Send the device address */
cbus_send_data(host, dev, CBUS_ADDR_BITS);
@ -141,12 +139,12 @@ static int cbus_transfer(struct cbus_host *host, char rw, unsigned dev,
cbus_send_data(host, data, 16);
ret = 0;
} else {
ret = gpio_direction_input(host->dat_gpio);
ret = gpiod_direction_input(host->dat);
if (ret) {
dev_dbg(host->dev, "failed setting direction\n");
goto out;
}
gpio_set_value(host->clk_gpio, 1);
gpiod_set_value(host->clk, 1);
ret = cbus_receive_word(host);
if (ret < 0) {
@ -156,9 +154,9 @@ static int cbus_transfer(struct cbus_host *host, char rw, unsigned dev,
}
/* Indicate end of transfer, SEL goes up until next transfer */
gpio_set_value(host->sel_gpio, 1);
gpio_set_value(host->clk_gpio, 1);
gpio_set_value(host->clk_gpio, 0);
gpiod_set_value(host->sel, 1);
gpiod_set_value(host->clk, 1);
gpiod_set_value(host->clk, 0);
out:
spin_unlock_irqrestore(&host->lock, flags);
@ -214,7 +212,6 @@ static int cbus_i2c_probe(struct platform_device *pdev)
{
struct i2c_adapter *adapter;
struct cbus_host *chost;
int ret;
adapter = devm_kzalloc(&pdev->dev, sizeof(struct i2c_adapter),
GFP_KERNEL);
@ -225,22 +222,20 @@ static int cbus_i2c_probe(struct platform_device *pdev)
if (!chost)
return -ENOMEM;
if (pdev->dev.of_node) {
struct device_node *dnode = pdev->dev.of_node;
if (of_gpio_count(dnode) != 3)
return -ENODEV;
chost->clk_gpio = of_get_gpio(dnode, 0);
chost->dat_gpio = of_get_gpio(dnode, 1);
chost->sel_gpio = of_get_gpio(dnode, 2);
} else if (dev_get_platdata(&pdev->dev)) {
struct i2c_cbus_platform_data *pdata =
dev_get_platdata(&pdev->dev);
chost->clk_gpio = pdata->clk_gpio;
chost->dat_gpio = pdata->dat_gpio;
chost->sel_gpio = pdata->sel_gpio;
} else {
if (gpiod_count(&pdev->dev, NULL) != 3)
return -ENODEV;
}
chost->clk = devm_gpiod_get_index(&pdev->dev, NULL, 0, GPIOD_OUT_LOW);
if (IS_ERR(chost->clk))
return PTR_ERR(chost->clk);
chost->dat = devm_gpiod_get_index(&pdev->dev, NULL, 1, GPIOD_IN);
if (IS_ERR(chost->dat))
return PTR_ERR(chost->dat);
chost->sel = devm_gpiod_get_index(&pdev->dev, NULL, 2, GPIOD_OUT_HIGH);
if (IS_ERR(chost->sel))
return PTR_ERR(chost->sel);
gpiod_set_consumer_name(chost->clk, "CBUS clk");
gpiod_set_consumer_name(chost->dat, "CBUS dat");
gpiod_set_consumer_name(chost->sel, "CBUS sel");
adapter->owner = THIS_MODULE;
adapter->class = I2C_CLASS_HWMON;
@ -254,21 +249,6 @@ static int cbus_i2c_probe(struct platform_device *pdev)
spin_lock_init(&chost->lock);
chost->dev = &pdev->dev;
ret = devm_gpio_request_one(&pdev->dev, chost->clk_gpio,
GPIOF_OUT_INIT_LOW, "CBUS clk");
if (ret)
return ret;
ret = devm_gpio_request_one(&pdev->dev, chost->dat_gpio, GPIOF_IN,
"CBUS data");
if (ret)
return ret;
ret = devm_gpio_request_one(&pdev->dev, chost->sel_gpio,
GPIOF_OUT_INIT_HIGH, "CBUS sel");
if (ret)
return ret;
i2c_set_adapdata(adapter, chost);
platform_set_drvdata(pdev, adapter);

27
include/linux/platform_data/i2c-cbus-gpio.h
View File

@ -1,27 +0,0 @@
/*
* i2c-cbus-gpio.h - CBUS I2C platform_data definition
*
* Copyright (C) 2004-2009 Nokia Corporation
*
* Written by Felipe Balbi and Aaro Koskinen.
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __INCLUDE_LINUX_I2C_CBUS_GPIO_H
#define __INCLUDE_LINUX_I2C_CBUS_GPIO_H
struct i2c_cbus_platform_data {
int dat_gpio;
int clk_gpio;
int sel_gpio;
};
#endif /* __INCLUDE_LINUX_I2C_CBUS_GPIO_H */