Re: [linux-sunxi] [PATCH v4 2/2] input: sun4i-ts: Add support for temperature sensor

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Hi,

On Sun, May 11, 2014 at 4:06 PM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
> The sun4i resisitive touchscreen controller also comes with a built-in
> temperature sensor. This commit adds support for it.
>
> This commit also introduces a new "ts-attached" device-tree property,
> when this is not set, the input part of the driver won't register. This way
> the internal temperature sensor can be used to measure the SoC temperature
> independent of there actually being a touchscreen attached to the controller.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
>  .../bindings/input/touchscreen/sun4i.txt           |   5 +
>  drivers/input/touchscreen/sun4i-ts.c               | 140 ++++++++++++++++-----
>  2 files changed, 114 insertions(+), 31 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
> index 881aea7..aef5779 100644
> --- a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
> +++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
> @@ -6,10 +6,15 @@ Required properties:
>   - reg: mmio address range of the chip
>   - interrupts: interrupt to which the chip is connected
>
> +Optional properties:
> + - allwinner,ts-attached: boolean indicating that an actual touchscreen is
> +                         attached to the controller
> +
>  Example:
>
>         rtp: rtp@01c25000 {
>                 compatible = "allwinner,sun4i-a10-ts";
>                 reg = <0x01c25000 0x100>;
>                 interrupts = <29>;
> +               allwinner,ts-attached;
>         };
> diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c
> index c5acdfb..f366221 100644
> --- a/drivers/input/touchscreen/sun4i-ts.c
> +++ b/drivers/input/touchscreen/sun4i-ts.c
> @@ -3,6 +3,9 @@
>   *
>   * Copyright (C) 2013 - 2014 Hans de Goede <hdegoede@xxxxxxxxxx>
>   *
> + * The hwmon parts are based on work by Corentin LABBE which is:
> + * Copyright (C) 2013 Corentin LABBE <clabbe.montjoie@xxxxxxxxx>
> + *
>   * 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
> @@ -30,6 +33,7 @@
>   */
>
>  #include <linux/err.h>
> +#include <linux/hwmon.h>
>  #include <linux/init.h>
>  #include <linux/input.h>
>  #include <linux/interrupt.h>
> @@ -106,14 +110,12 @@ struct sun4i_ts_data {
>         void __iomem *base;
>         unsigned int irq;
>         bool ignore_fifo_data;
> +       int temp_data;
>  };
>
> -static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
> +static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val)
>  {
> -       struct sun4i_ts_data *ts = dev_id;
> -       u32 reg_val, x, y;
> -
> -       reg_val  = readl(ts->base + TP_INT_FIFOS);
> +       u32 x, y;
>
>         if (reg_val & FIFO_DATA_PENDING) {
>                 x = readl(ts->base + TP_DATA);
> @@ -139,6 +141,20 @@ static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
>                 input_report_key(ts->input, BTN_TOUCH, 0);
>                 input_sync(ts->input);
>         }
> +}
> +
> +static irqreturn_t sun4i_ts_irq(int irq, void *dev_id)
> +{
> +       struct sun4i_ts_data *ts = dev_id;
> +       u32 reg_val;
> +
> +       reg_val  = readl(ts->base + TP_INT_FIFOS);
> +
> +       if (reg_val & TEMP_DATA_PENDING)
> +               ts->temp_data = readl(ts->base + TEMP_DATA);
> +
> +       if (ts->input)
> +               sun4i_ts_irq_handle_input(ts, reg_val);
>
>         writel(reg_val, ts->base + TP_INT_FIFOS);
>
> @@ -149,9 +165,9 @@ static int sun4i_ts_open(struct input_dev *dev)
>  {
>         struct sun4i_ts_data *ts = input_get_drvdata(dev);
>
> -       /* Flush, set trig level to 1, enable data and up irqs */
> -       writel(DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) | TP_UP_IRQ_EN(1),
> -              ts->base + TP_INT_FIFOC);
> +       /* Flush, set trig level to 1, enable temp, data and up irqs */
> +       writel(TEMP_IRQ_EN(1) | DATA_IRQ_EN(1) | FIFO_TRIG(1) | FIFO_FLUSH(1) |
> +               TP_UP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
>
>         return 0;
>  }
> @@ -160,15 +176,48 @@ static void sun4i_ts_close(struct input_dev *dev)
>  {
>         struct sun4i_ts_data *ts = input_get_drvdata(dev);
>
> -       /* Deactivate all IRQs */
> -       writel(0, ts->base + TP_INT_FIFOC);
> +       /* Deactivate all input IRQs */
> +       writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
> +}
> +
> +static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
> +                        char *buf)
> +{
> +       struct sun4i_ts_data *ts = dev_get_drvdata(dev);
> +
> +       /* No temp_data until the first irq */
> +       if (ts->temp_data == -1)
> +               return -EAGAIN;
> +
> +       return sprintf(buf, "%d\n", (ts->temp_data - 1447) * 100);
> +}
> +
> +static ssize_t show_temp_label(struct device *dev,
> +                             struct device_attribute *devattr, char *buf)
> +{
> +       return sprintf(buf, "SoC temperature\n");
>  }
>
> +static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
> +static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp_label, NULL);
> +
> +static struct attribute *sun4i_ts_attrs[] = {
> +       &dev_attr_temp1_input.attr,
> +       &dev_attr_temp1_label.attr,
> +       NULL
> +};
> +ATTRIBUTE_GROUPS(sun4i_ts);
> +
>  static int sun4i_ts_probe(struct platform_device *pdev)
>  {
>         struct sun4i_ts_data *ts;
>         struct device *dev = &pdev->dev;
> +       struct device_node *np = dev->of_node;
> +       struct device *hwmon;
>         int ret;
> +       bool ts_attached;
> +
> +       ts_attached = of_property_read_bool(np, "allwinner,ts-attached");
>
>         ts = devm_kzalloc(dev, sizeof(struct sun4i_ts_data), GFP_KERNEL);
>         if (!ts)
> @@ -176,24 +225,27 @@ static int sun4i_ts_probe(struct platform_device *pdev)
>
>         ts->dev = dev;
>         ts->ignore_fifo_data = true;
> -
> -       ts->input = devm_input_allocate_device(dev);
> -       if (!ts->input)
> -               return -ENOMEM;
> -
> -       ts->input->name = pdev->name;
> -       ts->input->phys = "sun4i_ts/input0";
> -       ts->input->open = sun4i_ts_open;
> -       ts->input->close = sun4i_ts_close;
> -       ts->input->id.bustype = BUS_HOST;
> -       ts->input->id.vendor = 0x0001;
> -       ts->input->id.product = 0x0001;
> -       ts->input->id.version = 0x0100;
> -       ts->input->evbit[0] =  BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
> -       set_bit(BTN_TOUCH, ts->input->keybit);
> -       input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0);
> -       input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0);
> -       input_set_drvdata(ts->input, ts);
> +       ts->temp_data = -1;
> +
> +       if (ts_attached) {
> +               ts->input = devm_input_allocate_device(dev);
> +               if (!ts->input)
> +                       return -ENOMEM;
> +
> +               ts->input->name = pdev->name;
> +               ts->input->phys = "sun4i_ts/input0";
> +               ts->input->open = sun4i_ts_open;
> +               ts->input->close = sun4i_ts_close;
> +               ts->input->id.bustype = BUS_HOST;
> +               ts->input->id.vendor = 0x0001;
> +               ts->input->id.product = 0x0001;
> +               ts->input->id.version = 0x0100;
> +               ts->input->evbit[0] =  BIT(EV_SYN) | BIT(EV_KEY) | BIT(EV_ABS);
> +               set_bit(BTN_TOUCH, ts->input->keybit);
> +               input_set_abs_params(ts->input, ABS_X, 0, 4095, 0, 0);
> +               input_set_abs_params(ts->input, ABS_Y, 0, 4095, 0, 0);
> +               input_set_drvdata(ts->input, ts);
> +       }
>
>         ts->base = devm_ioremap_resource(dev,
>                               platform_get_resource(pdev, IORESOURCE_MEM, 0));
> @@ -232,14 +284,39 @@ static int sun4i_ts_probe(struct platform_device *pdev)
>         writel(STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1) | TP_MODE_EN(1),
>                ts->base + TP_CTRL1);
>
> -       ret = input_register_device(ts->input);
> -       if (ret)
> -               return ret;
> +       hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts",
> +                                                      ts, sun4i_ts_groups);

This fails to compile when HWMON is not selected:

drivers/built-in.o: In function `sun4i_ts_probe':
/home/wens/cubieboard/linux/drivers/input/touchscreen/sun4i-ts.c:287:
undefined reference to `devm_hwmon_device_register_with_groups'

Best do a wrapper around the hwmon related code.
drivers/input/touchscreen/ads7846.c has something similar, albeit for voltage.


ChenYu

> +       if (IS_ERR(hwmon))
> +               return PTR_ERR(hwmon);
> +
> +       writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC);
> +
> +       if (ts_attached) {
> +               ret = input_register_device(ts->input);
> +               if (ret) {
> +                       writel(0, ts->base + TP_INT_FIFOC);
> +                       return ret;
> +               }
> +       }
>
>         platform_set_drvdata(pdev, ts);
>         return 0;
>  }
>
> +static int sun4i_ts_remove(struct platform_device *pdev)
> +{
> +       struct sun4i_ts_data *ts = platform_get_drvdata(pdev);
> +
> +       /* Explicit unregister to avoid open/close changing the imask later */
> +       if (ts->input)
> +               input_unregister_device(ts->input);
> +
> +       /* Deactivate all IRQs */
> +       writel(0, ts->base + TP_INT_FIFOC);
> +
> +       return 0;
> +}
> +
>  static const struct of_device_id sun4i_ts_of_match[] = {
>         { .compatible = "allwinner,sun4i-a10-ts", },
>         { /* sentinel */ }
> @@ -253,6 +330,7 @@ static struct platform_driver sun4i_ts_driver = {
>                 .of_match_table = of_match_ptr(sun4i_ts_of_match),
>         },
>         .probe  = sun4i_ts_probe,
> +       .remove = sun4i_ts_remove,
>  };
>
>  module_platform_driver(sun4i_ts_driver);
> --
> 1.9.0

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