[PATCH 5/6] mc13783: add power button support
Dmitry Torokhov
dmitry.torokhov at gmail.com
Fri Jul 22 01:00:56 EDT 2011
Hi Philippe,
On Thu, Jul 21, 2011 at 08:04:22PM +0200, Philippe Rétornaz wrote:
> This adds support for the power-on buttons of MC13783 PMIC.
> This is done using a misc input device.
>
Mostly looks good, just a couple of comments below.
> @@ -0,0 +1,288 @@
> +/**
> + * mc13783-pwrbutton.c - MC13783 Power Button Input Driver
> + *
Please drop the file name from comment - if we ever rename the file we
won't have to update it here as well.
> + * Copyright (C) 2011 Philippe Rétornaz
> + *
> + * Based on twl4030-pwrbutton driver by:
> + * Peter De Schrijver <peter.de-schrijver at nokia.com>
> + * Felipe Balbi <felipe.balbi at nokia.com>
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
> + */
> +
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/errno.h>
> +#include <linux/input.h>
> +#include <linux/interrupt.h>
> +#include <linux/platform_device.h>
> +#include <linux/mfd/mc13783.h>
> +#include <linux/sched.h>
> +#include <linux/slab.h>
> +
> +struct mc13783_pwrb {
> + struct input_dev *pwr;
> + struct mc13xxx *mc13783;
> +#define MC13783_PWRB_B1_POL_INVERT (1 << 0)
> +#define MC13783_PWRB_B2_POL_INVERT (1 << 1)
> +#define MC13783_PWRB_B3_POL_INVERT (1 << 2)
> + int flags;
> + unsigned short keymap[3];
> +};
> +
> +#define MC13783_REG_INTERRUPT_SENSE_1 5
> +#define MC13783_IRQSENSE1_ONOFD1S (1 << 3)
> +#define MC13783_IRQSENSE1_ONOFD2S (1 << 4)
> +#define MC13783_IRQSENSE1_ONOFD3S (1 << 5)
> +
> +#define MC13783_REG_POWER_CONTROL_2 15
> +#define MC13783_POWER_CONTROL_2_ON1BDBNC 4
> +#define MC13783_POWER_CONTROL_2_ON2BDBNC 6
> +#define MC13783_POWER_CONTROL_2_ON3BDBNC 8
> +#define MC13783_POWER_CONTROL_2_ON1BRSTEN (1 << 1)
> +#define MC13783_POWER_CONTROL_2_ON2BRSTEN (1 << 2)
> +#define MC13783_POWER_CONTROL_2_ON3BRSTEN (1 << 3)
> +
> +static irqreturn_t button_irq(int irq, void *_priv)
> +{
> + struct mc13783_pwrb *priv = _priv;
> + int val;
Please have blank lines between variable declarations and code.
> + mc13xxx_irq_ack(priv->mc13783, irq);
> + mc13xxx_reg_read(priv->mc13783, MC13783_REG_INTERRUPT_SENSE_1, &val);
> +
> + switch (irq) {
> + case MC13783_IRQ_ONOFD1:
> + val = val & MC13783_IRQSENSE1_ONOFD1S ? 1 : 0;
> + if (priv->flags & MC13783_PWRB_B1_POL_INVERT)
> + val ^= 1;
> + input_report_key(priv->pwr, priv->keymap[0], val);
> + break;
> +
> + case MC13783_IRQ_ONOFD2:
> + val = val & MC13783_IRQSENSE1_ONOFD2S ? 1 : 0;
> + if (priv->flags & MC13783_PWRB_B2_POL_INVERT)
> + val ^= 1;
> + input_report_key(priv->pwr, priv->keymap[1], val);
> + break;
> +
> + case MC13783_IRQ_ONOFD3:
> + val = val & MC13783_IRQSENSE1_ONOFD3S ? 1 : 0;
> + if (priv->flags & MC13783_PWRB_B3_POL_INVERT)
> + val ^= 1;
> + input_report_key(priv->pwr, priv->keymap[2], val);
> + break;
> + }
> +
> + input_sync(priv->pwr);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int __devinit mc13783_pwrbutton_probe(struct platform_device *pdev)
> +{
> + struct mc13xxx_buttons_platform_data *pdata;
const?
> + struct mc13xxx *mc13783 = dev_get_drvdata(pdev->dev.parent);
> + struct input_dev *pwr;
> + struct mc13783_pwrb *priv;
> + int err = 0;
> + int reg = 0;
> +
> + pdata = dev_get_platdata(&pdev->dev);
> + if (pdata == NULL) {
if (!pdata) { ..
> + dev_err(&pdev->dev, "missing platform data\n");
> + return -ENODEV;
> + }
> +
> + pwr = input_allocate_device();
> + if (!pwr) {
> + dev_dbg(&pdev->dev, "Can't allocate power button\n");
> + return -ENOMEM;
> + }
> +
> + priv = kzalloc(sizeof(*priv), GFP_KERNEL);
> +
Unneeded blank line here.
> + if (!priv) {
> + err = -ENOMEM;
> + dev_dbg(&pdev->dev, "Can't allocate power button\n");
> + goto free_input_dev;
> + }
> +
> + pwr->evbit[0] = BIT_MASK(EV_KEY);
Just use __set_bit() here as well. Also, why this initialization is
separate from the rest of the code initializing input device. I think it
is good practice to keep related pieces together.
> +
> + reg |= (pdata->b1on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON1BDBNC;
> + reg |= (pdata->b2on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON2BDBNC;
> + reg |= (pdata->b3on_flags & 0x3) << MC13783_POWER_CONTROL_2_ON3BDBNC;
> +
> + priv->pwr = pwr;
> + priv->mc13783 = mc13783;
> +
> + mc13xxx_lock(mc13783);
> +
> + if (pdata->b1on_flags & MC13783_BUTTON_ENABLE) {
> + priv->keymap[0] = pdata->b1on_key;
> + if (pdata->b1on_key != KEY_RESERVED)
> + __set_bit(pdata->b1on_key, pwr->keybit);
> +
> + if (pdata->b1on_flags & MC13783_BUTTON_POL_INVERT)
> + priv->flags |= MC13783_PWRB_B1_POL_INVERT;
> +
> + if (pdata->b1on_flags & MC13783_BUTTON_RESET_EN)
> + reg |= MC13783_POWER_CONTROL_2_ON1BRSTEN;
> +
> + err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD1,
> + button_irq, "b1on", priv);
> +
Another unneeded blank line.
> + if (err) {
> + mc13xxx_unlock(mc13783);
Why irregular error handling in this case? Just have a separate label
for the unlock statement and jump to it.
> +
> + dev_dbg(&pdev->dev, "Can't request irq\n");
> + goto free_priv;
> + }
> + }
> +
> + if (pdata->b2on_flags & MC13783_BUTTON_ENABLE) {
> + priv->keymap[0] = pdata->b2on_key;
> + if (pdata->b2on_key != KEY_RESERVED)
> + __set_bit(pdata->b2on_key, pwr->keybit);
> +
> + if (pdata->b2on_flags & MC13783_BUTTON_POL_INVERT)
> + priv->flags |= MC13783_PWRB_B2_POL_INVERT;
> +
> + if (pdata->b2on_flags & MC13783_BUTTON_RESET_EN)
> + reg |= MC13783_POWER_CONTROL_2_ON2BRSTEN;
> +
> + err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD2,
> + button_irq, "b2on", priv);
> +
> + if (err) {
> + dev_dbg(&pdev->dev, "Can't request irq\n");
> + goto free_irq_b1;
> + }
> + }
> +
> + if (pdata->b3on_flags & MC13783_BUTTON_ENABLE) {
> + priv->keymap[0] = pdata->b3on_key;
> + if (pdata->b3on_key != KEY_RESERVED)
> + __set_bit(pdata->b3on_key, pwr->keybit);
> +
> + if (pdata->b3on_flags & MC13783_BUTTON_POL_INVERT)
> + priv->flags |= MC13783_PWRB_B3_POL_INVERT;
> +
> + if (pdata->b3on_flags & MC13783_BUTTON_RESET_EN)
> + reg |= MC13783_POWER_CONTROL_2_ON3BRSTEN;
> +
> + err = mc13xxx_irq_request(mc13783, MC13783_IRQ_ONOFD3,
> + button_irq, "b3on", priv);
> +
> + if (err) {
> + dev_dbg(&pdev->dev, "Can't request irq: %d\n", err);
> + goto free_irq_b2;
> + }
> + }
> +
> + mc13xxx_reg_rmw(mc13783, MC13783_REG_POWER_CONTROL_2, 0x3FE, reg);
> +
> + mc13xxx_unlock(mc13783);
> +
> + pwr->name = "mc13783_pwrbutton";
> + pwr->phys = "mc13783_pwrbutton/input0";
> + pwr->dev.parent = &pdev->dev;
> +
> + pwr->keycode = priv->keymap;
> + pwr->keycodemax = ARRAY_SIZE(priv->keymap);
> + pwr->keycodesize = sizeof(priv->keymap[0]);
> +
> + err = input_register_device(pwr);
> + if (err) {
> + dev_dbg(&pdev->dev, "Can't register power button: %d\n", err);
> + goto free_irq;
> + }
> +
> + platform_set_drvdata(pdev, priv);
> +
> + return 0;
> +
> +free_irq:
> + mc13xxx_lock(mc13783);
> +
> + if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
> + mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD3, priv);
> +free_irq_b2:
> + if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
> + mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD2, priv);
> +
> +free_irq_b1:
> + if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
> + mc13xxx_irq_free(mc13783, MC13783_IRQ_ONOFD1, priv);
> +
> + mc13xxx_unlock(mc13783);
> +
> +free_priv:
> + kfree(priv);
> +
> +free_input_dev:
> + input_free_device(pwr);
> +
> + return err;
> +}
> +
> +static int __devexit mc13783_pwrbutton_remove(struct platform_device *pdev)
> +{
> + struct mc13783_pwrb *priv = platform_get_drvdata(pdev);
> + struct mc13xxx_buttons_platform_data *pdata;
const + entra line.
> + pdata = dev_get_platdata(&pdev->dev);
> +
> + mc13xxx_lock(priv->mc13783);
> +
> + if (pdata->b3on_flags & MC13783_BUTTON_ENABLE)
> + mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD3, priv);
> + if (pdata->b2on_flags & MC13783_BUTTON_ENABLE)
> + mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD2, priv);
> + if (pdata->b1on_flags & MC13783_BUTTON_ENABLE)
> + mc13xxx_irq_free(priv->mc13783, MC13783_IRQ_ONOFD1, priv);
> +
> + mc13xxx_unlock(priv->mc13783);
> +
> + input_unregister_device(priv->pwr);
> + kfree(priv);
> +
> + return 0;
> +}
> +
> +struct platform_driver mc13783_pwrbutton_driver = {
> + .probe = mc13783_pwrbutton_probe,
> + .remove = __devexit_p(mc13783_pwrbutton_remove),
> + .driver = {
> + .name = "mc13783-pwrbutton",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static int __init mc13783_pwrbutton_init(void)
> +{
> + return platform_driver_register(&mc13783_pwrbutton_driver);
> +}
> +module_init(mc13783_pwrbutton_init);
> +
> +static void __exit mc13783_pwrbutton_exit(void)
> +{
> + platform_driver_unregister(&mc13783_pwrbutton_driver);
> +}
> +module_exit(mc13783_pwrbutton_exit);
> +
> +MODULE_ALIAS("platform:mc13783-pwrbutton");
> +MODULE_DESCRIPTION("MC13783 Power Button");
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("Philippe Retornaz");
> diff --git a/drivers/mfd/mc13xxx-core.c b/drivers/mfd/mc13xxx-core.c
> index 2867c21..da8d276 100644
> --- a/drivers/mfd/mc13xxx-core.c
> +++ b/drivers/mfd/mc13xxx-core.c
> @@ -776,6 +776,10 @@ err_revision:
> mc13xxx_add_subdevice_pdata(mc13xxx, "%s-led",
> pdata->leds, sizeof(*pdata->leds));
>
> + if (pdata->buttons)
> + mc13xxx_add_subdevice_pdata(mc13xxx, "%s-pwrbutton",
> + pdata->buttons, sizeof(*pdata->buttons));
> +
> return 0;
> }
>
> diff --git a/include/linux/mfd/mc13783.h b/include/linux/mfd/mc13783.h
> index 3756a30..aa824d0 100644
> --- a/include/linux/mfd/mc13783.h
> +++ b/include/linux/mfd/mc13783.h
> @@ -106,6 +106,7 @@ static inline int mc13783_irq_ack(struct mc13783 *mc13783, int irq)
> #define mc13783_regulator_platform_data mc13xxx_regulator_platform_data
> #define mc13783_led_platform_data mc13xxx_led_platform_data
> #define mc13783_leds_platform_data mc13xxx_leds_platform_data
> +#define mc13783_buttons_platform_data mc13xxx_buttons_platform_data
>
> #define mc13783_platform_data mc13xxx_platform_data
> #define MC13783_USE_TOUCHSCREEN MC13XXX_USE_TOUCHSCREEN
> diff --git a/include/linux/mfd/mc13xxx.h b/include/linux/mfd/mc13xxx.h
> index cef1497..f24be68 100644
> --- a/include/linux/mfd/mc13xxx.h
> +++ b/include/linux/mfd/mc13xxx.h
> @@ -137,6 +137,22 @@ struct mc13xxx_leds_platform_data {
> char tc3_period;
> };
>
> +struct mc13xxx_buttons_platform_data {
> +#define MC13783_BUTTON_DBNC_0MS 0
> +#define MC13783_BUTTON_DBNC_30MS 1
> +#define MC13783_BUTTON_DBNC_150MS 2
> +#define MC13783_BUTTON_DBNC_750MS 3
> +#define MC13783_BUTTON_ENABLE (1 << 2)
> +#define MC13783_BUTTON_POL_INVERT (1 << 3)
> +#define MC13783_BUTTON_RESET_EN (1 << 4)
> + int b1on_flags;
> + unsigned short b1on_key;
> + int b2on_flags;
> + unsigned short b2on_key;
> + int b3on_flags;
> + unsigned short b3on_key;
> +};
> +
> struct mc13xxx_platform_data {
> #define MC13XXX_USE_TOUCHSCREEN (1 << 0)
> #define MC13XXX_USE_CODEC (1 << 1)
> @@ -146,6 +162,7 @@ struct mc13xxx_platform_data {
>
> struct mc13xxx_regulator_platform_data regulators;
> struct mc13xxx_leds_platform_data *leds;
> + struct mc13xxx_buttons_platform_data *buttons;
> };
>
> #endif /* ifndef __LINUX_MFD_MC13XXX_H */
> --
> 1.6.3.3
>
Otherwise:
Acked-by: Dmitry Torokhov <dtor at mail.ru>
Please feel free to merge with the rest of the patches.
Thanks.
--
Dmitry
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