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Date: Thu, 21 Apr 2011 16:11:30 +0100
From: Mark Brown <broonie@...nsource.wolfsonmicro.com>
To: Jorge Eduardo Candelaria <jedu@...mlogic.co.uk>
Cc: linux-kernel@...r.kernel.org, lrg@...com, sameo@...ux.intel.com,
Graeme Gregory <gg@...mlogic.co.uk>, grant@...retlab.ca
Subject: Re: [PATCHv4 2/4] TPS65910: GPIO: Add GPIO driver
On Thu, Apr 21, 2011 at 09:35:47AM -0500, Jorge Eduardo Candelaria wrote:
> From: Graeme Gregory <gg@...mlogic.co.uk>
>
> TPS65910 has one configurable GPIO that can be used for several
> purposes. Subsequent versions of the TPS chip support more than
> one GPIO.
>
> Signed-off-by: Jorge Eduardo Candelaria <jedu@...mlogic.co.uk>
CCing in Grant who's taken over the GPIO subsystem.
> ---
> drivers/mfd/Makefile | 2 +-
> drivers/mfd/tps65910-gpio.c | 109 ++++++++++++++++++++++++++++++++++++++++++
> drivers/mfd/tps65910.c | 7 +++
> include/linux/mfd/tps65910.h | 3 +
> 4 files changed, 120 insertions(+), 1 deletions(-)
> create mode 100644 drivers/mfd/tps65910-gpio.c
>
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 3afb7ac..012ed17 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -88,4 +88,4 @@ obj-$(CONFIG_MFD_VX855) += vx855.o
> obj-$(CONFIG_MFD_WL1273_CORE) += wl1273-core.o
> obj-$(CONFIG_MFD_CS5535) += cs5535-mfd.o
> obj-$(CONFIG_MFD_OMAP_USB_HOST) += omap-usb-host.o
> -obj-$(CONFIG_MFD_TPS65910) += tps65910.o
> +obj-$(CONFIG_MFD_TPS65910) += tps65910.o tps65910-gpio.o
> diff --git a/drivers/mfd/tps65910-gpio.c b/drivers/mfd/tps65910-gpio.c
> new file mode 100644
> index 0000000..7bb8fe6
> --- /dev/null
> +++ b/drivers/mfd/tps65910-gpio.c
> @@ -0,0 +1,109 @@
> +/*
> + * tps65910-gpio.c -- TI TPS6591x
> + *
> + * Copyright 2010 Texas Instruments Inc.
> + *
> + * Author: Graeme Gregory <gg@...mlogic.co.uk>
> + * Author: Jorge Eduardo Candelaria jedu@...mlogic.co.uk>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/errno.h>
> +#include <linux/gpio.h>
> +#include <linux/i2c.h>
> +#include <linux/mfd/tps65910.h>
> +
> +static int tps65910_gpio_get(struct gpio_chip *gc, unsigned offset)
> +{
> + struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
> + uint8_t val;
> +
> + tps65910->read(tps65910, TPS65910_GPIO0, 1, &val);
> +
> + if (val & GPIO0_GPIO_STS_MASK)
> + return 1;
> +
> + return 0;
> +}
> +
> +static void tps65910_gpio_set(struct gpio_chip *gc, unsigned offset,
> + int value)
> +{
> + struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
> + uint8_t val;
> +
> + tps65910->read(tps65910, TPS65910_GPIO0, 1, &val);
> +
> + if (value)
> + val |= GPIO0_GPIO_SET_MASK;
> + else
> + val &= ~GPIO0_GPIO_SET_MASK;
> +
> + tps65910->write(tps65910, TPS65910_GPIO0, 1, &val);
> +}
> +
> +static int tps65910_gpio_output(struct gpio_chip *gc, unsigned offset,
> + int value)
> +{
> + struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
> + uint8_t val;
> + int ret;
> +
> + ret = tps65910->read(tps65910, TPS65910_GPIO0, 1, &val);
> + if (ret < 0)
> + return ret;
> +
> + val |= GPIO0_GPIO_CFG_MASK;
> +
> + /* Set the initial value */
> + tps65910_gpio_set(gc, 0, value);
> +
> + return tps65910->write(tps65910, TPS65910_GPIO0, 1, &val);
> +}
> +
> +static int tps65910_gpio_input(struct gpio_chip *gc, unsigned offset)
> +{
> + struct tps65910 *tps65910 = container_of(gc, struct tps65910, gpio);
> + uint8_t val;
> + int ret;
> +
> + ret = tps65910->read(tps65910, TPS65910_GPIO0, 1, &val);
> + if (ret < 0)
> + return ret;
> +
> + val &= ~GPIO0_GPIO_CFG_MASK;
> +
> + return tps65910->write(tps65910, TPS65910_GPIO0, 1, &val);
> +}
> +
> +void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base)
> +{
> + int ret;
> +
> + if (!gpio_base)
> + return;
> +
> + tps65910->gpio.owner = THIS_MODULE;
> + tps65910->gpio.label = tps65910->i2c_client->name;
> + tps65910->gpio.dev = tps65910->dev;
> + tps65910->gpio.base = gpio_base;
> + tps65910->gpio.ngpio = 1;
> + tps65910->gpio.can_sleep = 1;
> +
> + tps65910->gpio.direction_input = tps65910_gpio_input;
> + tps65910->gpio.direction_output = tps65910_gpio_output;
> + tps65910->gpio.set = tps65910_gpio_set;
> + tps65910->gpio.get = tps65910_gpio_get;
> +
> + ret = gpiochip_add(&tps65910->gpio);
> +
> + if (ret)
> + dev_warn(tps65910->dev, "GPIO registration failed: %d\n", ret);
> +}
> diff --git a/drivers/mfd/tps65910.c b/drivers/mfd/tps65910.c
> index f13e448..99c43b6 100644
> --- a/drivers/mfd/tps65910.c
> +++ b/drivers/mfd/tps65910.c
> @@ -89,8 +89,13 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
> const struct i2c_device_id *id)
> {
> struct tps65910 *tps65910;
> + struct tps65910_board *pmic_plat_data;
> int ret = 0;
>
> + pmic_plat_data = dev_get_platdata(&i2c->dev);
> + if (!pmic_plat_data)
> + return -EINVAL;
> +
> tps65910 = kzalloc(sizeof(struct tps65910), GFP_KERNEL);
> if (tps65910 == NULL)
> return -ENOMEM;
> @@ -107,6 +112,8 @@ static int tps65910_i2c_probe(struct i2c_client *i2c,
> if (ret < 0)
> goto err;
>
> + tps65910_gpio_init(tps65910, pmic_plat_data->gpio_base);
> +
> return ret;
>
> err:
> diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h
> index 43c8631..bf3597e 100644
> --- a/include/linux/mfd/tps65910.h
> +++ b/include/linux/mfd/tps65910.h
> @@ -714,6 +714,7 @@
> */
>
> struct tps65910_board {
> + int gpio_base;
> struct regulator_init_data *tps65910_pmic_init_data;
> };
>
> @@ -746,4 +747,6 @@ struct tps65910_platform_data {
> int irq_base;
> };
>
> +void tps65910_gpio_init(struct tps65910 *tps65910, int gpio_base);
> +
> #endif /* __LINUX_MFD_TPS65910_H */
> --
> 1.7.1
--
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