diff options
author | Frank Schaefer <fschaefer.oss@googlemail.com> | 2013-12-01 18:06:52 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-12-10 16:10:35 -0200 |
commit | f522260993822d82e2c480aa676aa4ca1230d235 (patch) | |
tree | 88e133f503df0b8c1ae8a9f2978b6738cfe98914 /drivers/media/usb/em28xx/em28xx-input.c | |
parent | 07e4de3004ecedd67c72708d6c0fe69c51317f79 (diff) | |
download | linux-f522260993822d82e2c480aa676aa4ca1230d235.tar.bz2 |
[media] em28xx: extend the support for device buttons
The current code supports only a single snapshot button assigned to
register 0x0c bit 5. But devices may be equipped with multiple buttons
with different functionalities and they can also be assigned to the
various GPI-ports.
Extend the em28xx-input code to handle multiple buttons assigned to different
GPI-ports / register addresses and bits.
Also make easier to extend the code with further button types.
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/usb/em28xx/em28xx-input.c')
-rw-r--r-- | drivers/media/usb/em28xx/em28xx-input.c | 150 |
1 files changed, 113 insertions, 37 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-input.c b/drivers/media/usb/em28xx/em28xx-input.c index ea181e4b68c5..20c6a8ae1462 100644 --- a/drivers/media/usb/em28xx/em28xx-input.c +++ b/drivers/media/usb/em28xx/em28xx-input.c @@ -31,7 +31,7 @@ #include "em28xx.h" #define EM28XX_SNAPSHOT_KEY KEY_CAMERA -#define EM28XX_SBUTTON_QUERY_INTERVAL 500 +#define EM28XX_BUTTONS_QUERY_INTERVAL 500 static unsigned int ir_debug; module_param(ir_debug, int, 0644); @@ -470,38 +470,69 @@ static int em28xx_probe_i2c_ir(struct em28xx *dev) } /********************************************************** - Handle Webcam snapshot button + Handle buttons **********************************************************/ -static void em28xx_query_sbutton(struct work_struct *work) +static void em28xx_query_buttons(struct work_struct *work) { - /* Poll the register and see if the button is depressed */ struct em28xx *dev = - container_of(work, struct em28xx, sbutton_query_work.work); - int ret; - - ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP); - - if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) { - u8 cleared; - /* Button is depressed, clear the register */ - cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT; - em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1); - - /* Not emulate the keypress */ - input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY, - 1); - /* Now unpress the key */ - input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY, - 0); + container_of(work, struct em28xx, buttons_query_work.work); + u8 i, j; + int regval; + bool pressed; + + /* Poll and evaluate all addresses */ + for (i = 0; i < dev->num_button_polling_addresses; i++) { + /* Read value from register */ + regval = em28xx_read_reg(dev, dev->button_polling_addresses[i]); + if (regval < 0) + continue; + /* Check states of the buttons and act */ + j = 0; + while (dev->board.buttons[j].role >= 0 && + dev->board.buttons[j].role < EM28XX_NUM_BUTTON_ROLES) { + struct em28xx_button *button = &dev->board.buttons[j]; + /* Check if button uses the current address */ + if (button->reg_r != dev->button_polling_addresses[i]) { + j++; + continue; + } + /* Determine if button is pressed */ + pressed = regval & button->mask; + if (button->inverted) + pressed = !pressed; + /* Handle button state */ + if (!pressed) { + j++; + continue; + } + switch (button->role) { + case EM28XX_BUTTON_SNAPSHOT: + /* Emulate the keypress */ + input_report_key(dev->sbutton_input_dev, + EM28XX_SNAPSHOT_KEY, 1); + /* Unpress the key */ + input_report_key(dev->sbutton_input_dev, + EM28XX_SNAPSHOT_KEY, 0); + break; + default: + WARN_ONCE(1, "BUG: unhandled button role."); + } + /* Clear button state (if needed) */ + if (button->reg_clearing) + em28xx_write_reg(dev, button->reg_clearing, + (~regval & button->mask) + | (regval & ~button->mask)); + /* Next button */ + j++; + } } - /* Schedule next poll */ - schedule_delayed_work(&dev->sbutton_query_work, - msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL)); + schedule_delayed_work(&dev->buttons_query_work, + msecs_to_jiffies(EM28XX_BUTTONS_QUERY_INTERVAL)); } -static void em28xx_register_snapshot_button(struct em28xx *dev) +static int em28xx_register_snapshot_button(struct em28xx *dev) { struct input_dev *input_dev; int err; @@ -510,14 +541,13 @@ static void em28xx_register_snapshot_button(struct em28xx *dev) input_dev = input_allocate_device(); if (!input_dev) { em28xx_errdev("input_allocate_device failed\n"); - return; + return -ENOMEM; } usb_make_path(dev->udev, dev->snapshot_button_path, sizeof(dev->snapshot_button_path)); strlcat(dev->snapshot_button_path, "/sbutton", sizeof(dev->snapshot_button_path)); - INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton); input_dev->name = "em28xx snapshot button"; input_dev->phys = dev->snapshot_button_path; @@ -535,25 +565,71 @@ static void em28xx_register_snapshot_button(struct em28xx *dev) if (err) { em28xx_errdev("input_register_device failed\n"); input_free_device(input_dev); - return; + return err; } dev->sbutton_input_dev = input_dev; - schedule_delayed_work(&dev->sbutton_query_work, - msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL)); - return; + return 0; +} +static void em28xx_init_buttons(struct em28xx *dev) +{ + u8 i = 0, j = 0; + bool addr_new = 0; + + while (dev->board.buttons[i].role >= 0 && + dev->board.buttons[i].role < EM28XX_NUM_BUTTON_ROLES) { + struct em28xx_button *button = &dev->board.buttons[i]; + /* Check if polling address is already on the list */ + addr_new = 1; + for (j = 0; j < dev->num_button_polling_addresses; j++) { + if (button->reg_r == dev->button_polling_addresses[j]) { + addr_new = 0; + break; + } + } + /* Check if max. number of polling addresses is exceeded */ + if (addr_new && dev->num_button_polling_addresses + >= EM28XX_NUM_BUTTON_ADDRESSES_MAX) { + WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded."); + addr_new = 0; + } + /* Register input device (if needed) */ + if (button->role == EM28XX_BUTTON_SNAPSHOT) { + if (em28xx_register_snapshot_button(dev) < 0) + addr_new = 0; + } + /* Add read address to list of polling addresses */ + if (addr_new) { + unsigned int index = dev->num_button_polling_addresses; + dev->button_polling_addresses[index] = button->reg_r; + dev->num_button_polling_addresses++; + } + /* Next button */ + i++; + } + + /* Start polling */ + if (dev->num_button_polling_addresses) { + INIT_DELAYED_WORK(&dev->buttons_query_work, + em28xx_query_buttons); + schedule_delayed_work(&dev->buttons_query_work, + msecs_to_jiffies(EM28XX_BUTTONS_QUERY_INTERVAL)); + } } -static void em28xx_deregister_snapshot_button(struct em28xx *dev) +static void em28xx_shutdown_buttons(struct em28xx *dev) { + /* Cancel polling */ + cancel_delayed_work_sync(&dev->buttons_query_work); + /* Clear polling addresses list */ + dev->num_button_polling_addresses = 0; + /* Deregister input devices */ if (dev->sbutton_input_dev != NULL) { em28xx_info("Deregistering snapshot button\n"); - cancel_delayed_work_sync(&dev->sbutton_query_work); input_unregister_device(dev->sbutton_input_dev); dev->sbutton_input_dev = NULL; } - return; } static int em28xx_ir_init(struct em28xx *dev) @@ -564,8 +640,8 @@ static int em28xx_ir_init(struct em28xx *dev) u64 rc_type; u16 i2c_rc_dev_addr = 0; - if (dev->board.has_snapshot_button) - em28xx_register_snapshot_button(dev); + if (dev->board.buttons) + em28xx_init_buttons(dev); if (dev->board.has_ir_i2c) { i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev); @@ -688,7 +764,7 @@ static int em28xx_ir_fini(struct em28xx *dev) { struct em28xx_IR *ir = dev->ir; - em28xx_deregister_snapshot_button(dev); + em28xx_shutdown_buttons(dev); /* skip detach on non attached boards */ if (!ir) |