target/linux/brcm2708/patches-4.1/0139-rpi-ft5406-Use-firmware-API.patch

   1 From 1c445d2c28dcbd90be62624bd9ae9bd88e564b96 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
   3 Date: Tue, 21 Jul 2015 19:09:39 +0200
   4 Subject: [PATCH 139/171] rpi-ft5406: Use firmware API
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  10 ---
  11  arch/arm/boot/dts/overlays/rpi-ft5406-overlay.dts |  1 +
  12  drivers/input/touchscreen/rpi-ft5406.c            | 74 ++++++++++-------------
  13  2 files changed, 32 insertions(+), 43 deletions(-)
  14
  15 --- a/arch/arm/boot/dts/overlays/rpi-ft5406-overlay.dts
  16 +++ b/arch/arm/boot/dts/overlays/rpi-ft5406-overlay.dts
  17 @@ -9,6 +9,7 @@
  18                 __overlay__ {
  19                         rpi_ft5406: rpi_ft5406 {
  20                                 compatible = "rpi,rpi-ft5406";
  21 +                               firmware = <&firmware>;
  22                                 status = "okay";
  23                         };
  24                 };
  25 --- a/drivers/input/touchscreen/rpi-ft5406.c
  26 +++ b/drivers/input/touchscreen/rpi-ft5406.c
  27 @@ -21,7 +21,7 @@
  28  #include <linux/kthread.h>
  29  #include <linux/platform_device.h>
  30  #include <asm/io.h>
  31 -#include <linux/platform_data/mailbox-bcm2708.h>
  32 +#include <soc/bcm2835/raspberrypi-firmware.h>
  33
  34  #define MAXIMUM_SUPPORTED_POINTS 10
  35  struct ft5406_regs {
  36 @@ -49,23 +49,6 @@ struct ft5406 {
  37         struct task_struct     * thread;
  38  };
  39
  40 -
  41 -/* tag part of the message */
  42 -struct vc_msg_tag {
  43 -       uint32_t tag_id;                /* the message id */
  44 -       uint32_t buffer_size;   /* size of the buffer (which in this case is always 8 bytes) */
  45 -       uint32_t data_size;             /* amount of data being sent or received */
  46 -       uint32_t val;           /* data buffer */
  47 -};
  48 -
  49 -/* message structure to be sent to videocore */
  50 -struct vc_msg {
  51 -       uint32_t msg_size;              /* simply, sizeof(struct vc_msg) */
  52 -       uint32_t request_code;  /* holds various information like the success and number of bytes returned (refer to mailboxes wiki) */
  53 -       struct vc_msg_tag tag;  /* the tag structure above to make */
  54 -       uint32_t end_tag;               /* an end identifier, should be set to NULL */
  55 -};
  56 -
  57  /* Thread to poll for touchscreen events
  58   *
  59   * This thread polls the memory based register copy of the ft5406 registers
  60 @@ -136,11 +119,37 @@ static int ft5406_probe(struct platform_
  61  {
  62         int ret;
  63         struct input_dev * input_dev = input_allocate_device();
  64 -       struct vc_msg request;
  65         struct ft5406 * ts;
  66 +       struct device_node *fw_node;
  67 +       struct rpi_firmware *fw;
  68 +       u32 touchbuf;
  69
  70         dev_info(&pdev->dev, "Probing device\n");
  71
  72 +       fw_node = of_parse_phandle(pdev->dev.of_node, "firmware", 0);
  73 +       if (!fw_node) {
  74 +               dev_err(&pdev->dev, "Missing firmware node\n");
  75 +               return -ENOENT;
  76 +       }
  77 +
  78 +       fw = rpi_firmware_get(fw_node);
  79 +       if (!fw)
  80 +               return -EPROBE_DEFER;
  81 +
  82 +       ret = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_GET_TOUCHBUF,
  83 +                                   &touchbuf, sizeof(touchbuf));
  84 +       if (ret) {
  85 +               dev_err(&pdev->dev, "Failed to get touch buffer\n");
  86 +               return ret;
  87 +       }
  88 +
  89 +       if (!touchbuf) {
  90 +               dev_err(&pdev->dev, "Touchscreen not detected\n");
  91 +               return -ENODEV;
  92 +       }
  93 +
  94 +       dev_dbg(&pdev->dev, "Got TS buffer 0x%x\n", touchbuf);
  95 +
  96         ts = kzalloc(sizeof(struct ft5406), GFP_KERNEL);
  97
  98         if (!ts || !input_dev) {
  99 @@ -174,36 +183,15 @@ static int ft5406_probe(struct platform_
 100                 return ret;
 101         }
 102
 103 -       memset(&request, 0, sizeof request);
 104 -
 105 -       request.msg_size = sizeof request;
 106 -       request.request_code = VCMSG_PROCESS_REQUEST;
 107 -       request.tag.tag_id = VCMSG_GET_TOUCHBUF;
 108 -       request.tag.buffer_size = 4;
 109 -       request.tag.data_size = 4;
 110 -
 111 -       bcm_mailbox_property(&request, sizeof(request));
 112 -
 113 -       if(request.request_code == VCMSG_REQUEST_SUCCESSFUL && request.tag.val != 0)
 114 -       {
 115 -               dev_dbg(&pdev->dev, "Got TS buffer 0x%x\n", request.tag.val);
 116 -       }
 117 -       else
 118 -       {
 119 -               input_unregister_device(input_dev);
 120 -               kzfree(ts);
 121 -               return -1;
 122 -       }
 123 -
 124         // mmap the physical memory
 125 -       request.tag.val &= ~0xc0000000;
 126 -       ts->ts_base = ioremap(request.tag.val, sizeof(*ts->regs));
 127 +       touchbuf &= ~0xc0000000;
 128 +       ts->ts_base = ioremap(touchbuf, sizeof(*ts->regs));
 129         if(ts->ts_base == NULL)
 130         {
 131                 dev_err(&pdev->dev, "Failed to map physical address\n");
 132                 input_unregister_device(input_dev);
 133                 kzfree(ts);
 134 -               return -1;
 135 +               return -ENOMEM;
 136         }
 137
 138         ts->regs = (struct ft5406_regs *) ts->ts_base;