[v2] leds: add driver for the iPAQ micro

This adds a driver for the iPAQ microcontroller LED.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
ChangeLog v1->v2:
- Rename the classdev to "led-ipaq-micro"
- Bail out properly on probe error
---
 drivers/leds/Kconfig           |   7 ++
 drivers/leds/Makefile          |   1 +
 drivers/leds/leds-ipaq-micro.c | 141 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 149 insertions(+)
 create mode 100644 drivers/leds/leds-ipaq-micro.c

On Wed, Jul 23, 2014 at 5:36 AM, Linus Walleij <linus.walleij@linaro.org> wrote:
> This adds a driver for the iPAQ microcontroller LED.
>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> ---
> ChangeLog v1->v2:
> - Rename the classdev to "led-ipaq-micro"
> - Bail out properly on probe error

Good, applied already.

-Bryan

> ---
>  drivers/leds/Kconfig           |   7 ++
>  drivers/leds/Makefile          |   1 +
>  drivers/leds/leds-ipaq-micro.c | 141 +++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 149 insertions(+)
>  create mode 100644 drivers/leds/leds-ipaq-micro.c
>
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index a1b044e7eaad..30e82860567a 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -143,6 +143,13 @@ config LEDS_SUNFIRE
>           This option enables support for the Left, Middle, and Right
>           LEDs on the I/O and CPU boards of SunFire UltraSPARC servers.
>
> +config LEDS_IPAQ_MICRO
> +       tristate "LED Support for the Compaq iPAQ h3xxx"
> +       depends on MFD_IPAQ_MICRO
> +       help
> +         Choose this option if you want to use the notification LED on
> +         Compaq/HP iPAQ h3100 and h3600.
> +
>  config LEDS_HP6XX
>         tristate "LED Support for the HP Jornada 6xx"
>         depends on LEDS_CLASS
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index 79c5155199a7..b2a62959ff8f 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -31,6 +31,7 @@ obj-$(CONFIG_LEDS_LP8501)             += leds-lp8501.o
>  obj-$(CONFIG_LEDS_LP8788)              += leds-lp8788.o
>  obj-$(CONFIG_LEDS_TCA6507)             += leds-tca6507.o
>  obj-$(CONFIG_LEDS_CLEVO_MAIL)          += leds-clevo-mail.o
> +obj-$(CONFIG_LEDS_IPAQ_MICRO)          += leds-ipaq-micro.o
>  obj-$(CONFIG_LEDS_HP6XX)               += leds-hp6xx.o
>  obj-$(CONFIG_LEDS_OT200)               += leds-ot200.o
>  obj-$(CONFIG_LEDS_FSG)                 += leds-fsg.o
> diff --git a/drivers/leds/leds-ipaq-micro.c b/drivers/leds/leds-ipaq-micro.c
> new file mode 100644
> index 000000000000..3210a47f0812
> --- /dev/null
> +++ b/drivers/leds/leds-ipaq-micro.c
> @@ -0,0 +1,141 @@
> +/*
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * h3xxx atmel micro companion support, notification LED subdevice
> + *
> + * Author : Linus Walleij <linus.walleij@linaro.org>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/mfd/ipaq-micro.h>
> +#include <linux/leds.h>
> +
> +#define LED_YELLOW     0x00
> +#define LED_GREEN      0x01
> +
> +#define LED_EN          (1 << 4)        /* LED ON/OFF 0:off, 1:on                       */
> +#define LED_AUTOSTOP    (1 << 5)        /* LED ON/OFF auto stop set 0:disable, 1:enable */
> +#define LED_ALWAYS      (1 << 6)        /* LED Interrupt Mask 0:No mask, 1:mask         */
> +
> +static void micro_leds_brightness_set(struct led_classdev *led_cdev,
> +                                     enum led_brightness value)
> +{
> +       struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
> +       /*
> +        * In this message:
> +        * Byte 0 = LED color: 0 = yellow, 1 = green
> +        *          yellow LED is always ~30 blinks per minute
> +        * Byte 1 = duration (flags?) appears to be ignored
> +        * Byte 2 = green ontime in 1/10 sec (deciseconds)
> +        *          1 = 1/10 second
> +        *          0 = 256/10 second
> +        * Byte 3 = green offtime in 1/10 sec (deciseconds)
> +        *          1 = 1/10 second
> +        *          0 = 256/10 seconds
> +        */
> +       struct ipaq_micro_msg msg = {
> +               .id = MSG_NOTIFY_LED,
> +               .tx_len = 4,
> +       };
> +
> +       msg.tx_data[0] = LED_GREEN;
> +       msg.tx_data[1] = 0;
> +       if (value) {
> +               msg.tx_data[2] = 0; /* Duty cycle 256 */
> +               msg.tx_data[3] = 1;
> +       } else {
> +               msg.tx_data[2] = 1;
> +               msg.tx_data[3] = 0; /* Duty cycle 256 */
> +       }
> +       ipaq_micro_tx_msg_sync(micro, &msg);
> +}
> +
> +/* Maximum duty cycle in ms 256/10 sec = 25600 ms */
> +#define IPAQ_LED_MAX_DUTY 25600
> +
> +static int micro_leds_blink_set(struct led_classdev *led_cdev,
> +                               unsigned long *delay_on,
> +                               unsigned long *delay_off)
> +{
> +       struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
> +       /*
> +        * In this message:
> +        * Byte 0 = LED color: 0 = yellow, 1 = green
> +        *          yellow LED is always ~30 blinks per minute
> +        * Byte 1 = duration (flags?) appears to be ignored
> +        * Byte 2 = green ontime in 1/10 sec (deciseconds)
> +        *          1 = 1/10 second
> +        *          0 = 256/10 second
> +        * Byte 3 = green offtime in 1/10 sec (deciseconds)
> +        *          1 = 1/10 second
> +        *          0 = 256/10 seconds
> +        */
> +       struct ipaq_micro_msg msg = {
> +               .id = MSG_NOTIFY_LED,
> +               .tx_len = 4,
> +       };
> +
> +       msg.tx_data[0] = LED_GREEN;
> +        if (*delay_on > IPAQ_LED_MAX_DUTY ||
> +           *delay_off > IPAQ_LED_MAX_DUTY)
> +                return -EINVAL;
> +
> +        if (*delay_on == 0 && *delay_off == 0) {
> +                *delay_on = 100;
> +                *delay_off = 100;
> +        }
> +
> +       msg.tx_data[1] = 0;
> +       if (*delay_on >= IPAQ_LED_MAX_DUTY)
> +               msg.tx_data[2] = 0;
> +       else
> +               msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100);
> +       if (*delay_off >= IPAQ_LED_MAX_DUTY)
> +               msg.tx_data[3] = 0;
> +       else
> +               msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100);
> +       return ipaq_micro_tx_msg_sync(micro, &msg);
> +}
> +
> +static struct led_classdev micro_led = {
> +       .name                   = "led-ipaq-micro",
> +       .brightness_set         = micro_leds_brightness_set,
> +       .blink_set              = micro_leds_blink_set,
> +       .flags                  = LED_CORE_SUSPENDRESUME,
> +};
> +
> +static int micro_leds_probe(struct platform_device *pdev)
> +{
> +       int ret;
> +
> +       ret = led_classdev_register(&pdev->dev, &micro_led);
> +       if (ret) {
> +               dev_err(&pdev->dev, "registering led failed: %d\n", ret);
> +               return ret;
> +       }
> +       dev_info(&pdev->dev, "iPAQ micro notification LED driver\n");
> +
> +       return 0;
> +}
> +
> +static int micro_leds_remove(struct platform_device *pdev)
> +{
> +       led_classdev_unregister(&micro_led);
> +       return 0;
> +}
> +
> +struct platform_driver micro_leds_device_driver = {
> +       .driver = {
> +               .name    = "ipaq-micro-leds",
> +       },
> +       .probe   = micro_leds_probe,
> +       .remove  = micro_leds_remove,
> +};
> +module_platform_driver(micro_leds_device_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
> +MODULE_ALIAS("platform:ipaq-micro-leds");
> --
> 1.9.3
>
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