git.openwrt.org Git - openwrt/staging/linusw.git/blob

   1 From 13a9614267e7d8d4075144a7bf4dbebfcc565367 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Mon, 30 Jan 2023 14:46:16 +0000
   4 Subject: [PATCH] input: goodix: Add option to poll instead of relying
   5  on IRQ line
   6
   7 The interrupt line from the touch controller is not necessarily
   8 connected to the SoC, so add the option to poll for touch info.
   9
  10 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  11 ---
  12  drivers/input/touchscreen/goodix.c | 70 +++++++++++++++++++++++++++---
  13  drivers/input/touchscreen/goodix.h |  2 +
  14  2 files changed, 66 insertions(+), 6 deletions(-)
  15
  16 --- a/drivers/input/touchscreen/goodix.c
  17 +++ b/drivers/input/touchscreen/goodix.c
  18 @@ -48,6 +48,8 @@
  19  #define MAX_CONTACTS_LOC       5
  20  #define TRIGGER_LOC            6
  21
  22 +#define POLL_INTERVAL_MS               17      /* 17ms = 60fps */
  23 +
  24  /* Our special handling for GPIO accesses through ACPI is x86 specific */
  25  #if defined CONFIG_X86 && defined CONFIG_ACPI
  26  #define ACPI_GPIO_SUPPORT
  27 @@ -513,16 +515,67 @@ static irqreturn_t goodix_ts_irq_handler
  28         return IRQ_HANDLED;
  29  }
  30
  31 +static void goodix_ts_irq_poll_timer(struct timer_list *t)
  32 +{
  33 +       struct goodix_ts_data *ts = from_timer(ts, t, timer);
  34 +
  35 +       schedule_work(&ts->work_i2c_poll);
  36 +       mod_timer(&ts->timer, jiffies + msecs_to_jiffies(POLL_INTERVAL_MS));
  37 +}
  38 +
  39 +static void goodix_ts_work_i2c_poll(struct work_struct *work)
  40 +{
  41 +       struct goodix_ts_data *ts = container_of(work,
  42 +                       struct goodix_ts_data, work_i2c_poll);
  43 +
  44 +       goodix_process_events(ts);
  45 +       goodix_i2c_write_u8(ts->client, GOODIX_READ_COOR_ADDR, 0);
  46 +}
  47 +
  48 +static void goodix_enable_irq(struct goodix_ts_data *ts)
  49 +{
  50 +       if (ts->client->irq) {
  51 +               enable_irq(ts->client->irq);
  52 +       } else {
  53 +               ts->timer.expires = jiffies + msecs_to_jiffies(POLL_INTERVAL_MS);
  54 +               add_timer(&ts->timer);
  55 +       }
  56 +}
  57 +
  58 +static void goodix_disable_irq(struct goodix_ts_data *ts)
  59 +{
  60 +       if (ts->client->irq) {
  61 +               disable_irq(ts->client->irq);
  62 +       } else {
  63 +               del_timer(&ts->timer);
  64 +               cancel_work_sync(&ts->work_i2c_poll);
  65 +       }
  66 +}
  67 +
  68  static void goodix_free_irq(struct goodix_ts_data *ts)
  69  {
  70 -       devm_free_irq(&ts->client->dev, ts->client->irq, ts);
  71 +       if (ts->client->irq) {
  72 +               devm_free_irq(&ts->client->dev, ts->client->irq, ts);
  73 +       } else {
  74 +               del_timer(&ts->timer);
  75 +               cancel_work_sync(&ts->work_i2c_poll);
  76 +       }
  77  }
  78
  79  static int goodix_request_irq(struct goodix_ts_data *ts)
  80  {
  81 -       return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
  82 -                                        NULL, goodix_ts_irq_handler,
  83 -                                        ts->irq_flags, ts->client->name, ts);
  84 +       if (ts->client->irq) {
  85 +               return devm_request_threaded_irq(&ts->client->dev, ts->client->irq,
  86 +                                                NULL, goodix_ts_irq_handler,
  87 +                                                ts->irq_flags, ts->client->name, ts);
  88 +       } else {
  89 +               INIT_WORK(&ts->work_i2c_poll,
  90 +                         goodix_ts_work_i2c_poll);
  91 +               timer_setup(&ts->timer, goodix_ts_irq_poll_timer, 0);
  92 +               if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE)
  93 +                       goodix_enable_irq(ts);
  94 +               return 0;
  95 +       }
  96  }
  97
  98  static int goodix_check_cfg_8(struct goodix_ts_data *ts, const u8 *cfg, int len)
  99 @@ -1425,6 +1478,11 @@ static void goodix_ts_remove(struct i2c_
 100  {
 101         struct goodix_ts_data *ts = i2c_get_clientdata(client);
 102
 103 +       if (!client->irq) {
 104 +               del_timer(&ts->timer);
 105 +               cancel_work_sync(&ts->work_i2c_poll);
 106 +       }
 107 +
 108         if (ts->load_cfg_from_disk)
 109                 wait_for_completion(&ts->firmware_loading_complete);
 110  }
 111 @@ -1440,7 +1498,7 @@ static int __maybe_unused goodix_suspend
 112
 113         /* We need gpio pins to suspend/resume */
 114         if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
 115 -               disable_irq(client->irq);
 116 +               goodix_disable_irq(ts);
 117                 return 0;
 118         }
 119
 120 @@ -1484,7 +1542,7 @@ static int __maybe_unused goodix_resume(
 121         int error;
 122
 123         if (ts->irq_pin_access_method == IRQ_PIN_ACCESS_NONE) {
 124 -               enable_irq(client->irq);
 125 +               goodix_enable_irq(ts);
 126                 return 0;
 127         }
 128
 129 --- a/drivers/input/touchscreen/goodix.h
 130 +++ b/drivers/input/touchscreen/goodix.h
 131 @@ -104,6 +104,8 @@ struct goodix_ts_data {
 132         u8 main_clk[GOODIX_MAIN_CLK_LEN];
 133         int bak_ref_len;
 134         u8 *bak_ref;
 135 +       struct timer_list timer;
 136 +       struct work_struct work_i2c_poll;
 137  };
 138
 139  int goodix_i2c_read(struct i2c_client *client, u16 reg, u8 *buf, int len);