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Date: Wed, 25 Nov 2009 20:10:47 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Wu Zhangjin <wuzhangjin@...il.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org,
Richard Purdie <rpurdie@...ys.net>, lm-sensors@...sensors.org,
linux-input@...r.kernel.org, linux-laptop@...r.kernel.org,
Stephen Rothwell <sfr@...b.auug.org.au>, sfr@...uxcare.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] [loongson] yeeloong2f: add platform specific support
Hi Wu,
Overall impression - several drivers crammed into one module, I wonder
if it could be split somewhat. Some input-related concerns below.
On Sat, Nov 21, 2009 at 08:08:40PM +0800, Wu Zhangjin wrote:
> +
> +/* hotkey input subdriver */
> +
> +static struct input_dev *yeeloong_hotkey_dev;
> +static int event, status;
> +
> +struct key_entry {
> + char type; /* See KE_* below */
> + int event; /* event from SCI */
> + u16 keycode; /* KEY_* or SW_* */
> +};
> +
> +enum { KE_KEY, KE_SW, KE_END };
I am going to post the sparse keymap library shortly, this driver could
use it too...
> +
> +static struct key_entry yeeloong_keymap[] = {
> + {KE_SW, EVENT_LID, SW_LID},
> + /* SW_VIDEOOUT_INSERT? not included in hald-addon-input! */
> + {KE_KEY, EVENT_CRT_DETECT, KEY_PROG1},
> + /* Seems battery subdriver should report it */
> + {KE_KEY, EVENT_OVERTEMP, KEY_PROG2},
Does not seem to be an input event?
> + /*{KE_KEY, EVENT_AC_BAT, KEY_BATTERY},*/
> + {KE_KEY, EVENT_CAMERA, KEY_CAMERA}, /* Fn + ESC */
> + {KE_KEY, EVENT_SLEEP, KEY_SLEEP}, /* Fn + F1 */
> + /* Seems not clear? not included in hald-addon-input! */
> + {KE_KEY, EVENT_BLACK_SCREEN, KEY_PROG3}, /* Fn + F2 */
Do you mean "lock screen"?
> + {KE_KEY, EVENT_DISPLAY_TOGGLE, KEY_SWITCHVIDEOMODE}, /* Fn + F3 */
> + {KE_KEY, EVENT_AUDIO_MUTE, KEY_MUTE}, /* Fn + F4 */
> + {KE_KEY, EVENT_WLAN, KEY_WLAN}, /* Fn + F5 */
> + {KE_KEY, EVENT_DISPLAY_BRIGHTNESS, KEY_BRIGHTNESSUP}, /* Fn + up */
> + {KE_KEY, EVENT_DISPLAY_BRIGHTNESS, KEY_BRIGHTNESSDOWN}, /* Fn + down */
> + {KE_KEY, EVENT_AUDIO_VOLUME, KEY_VOLUMEUP}, /* Fn + right */
> + {KE_KEY, EVENT_AUDIO_VOLUME, KEY_VOLUMEDOWN}, /* Fn + left */
> + {KE_END, 0}
> +};
> +
...
> +
> +static ssize_t
> +ignore_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t count)
> +{
> + return count;
> +}
> +
> +static ssize_t
> +show_hotkeystate(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d %d\n", event, status);
> +}
> +
> +static DEVICE_ATTR(state, 0444, show_hotkeystate, ignore_store);
Why do you need "ignore_store" and not just use NULL? Also why do you
need to export the state at all?
> +
> +static struct attribute *hotkey_attributes[] = {
> + &dev_attr_state.attr,
> + NULL
> +};
> +
> +static struct attribute_group hotkey_attribute_group = {
> + .attrs = hotkey_attributes
> +};
> +
> +static int camera_set(int status)
> +{
> + int value;
> + static int camera_status;
> +
> + if (status == 2)
> + /* resume the old camera status */
> + camera_set(camera_status);
> + else if (status == 3) {
> + /* revert the camera status */
> + value = ec_read(REG_CAMERA_CONTROL);
> + ec_write(REG_CAMERA_CONTROL, value | (1 << 1));
> + } else {/* status == 0 or status == 1 */
> + status = !!status;
> + camera_status = ec_read(REG_CAMERA_STATUS);
> + if (status != camera_status)
> + camera_set(3);
> + }
> + return ec_read(REG_CAMERA_STATUS);
> +}
> +
> +#define I8042_STATUS_REG 0x64
> +#define I8042_DATA_REG 0x60
> +#define i8042_read_status() inb(I8042_STATUS_REG)
> +#define i8042_read_data() inb(I8042_DATA_REG)
> +#define I8042_STR_OBF 0x01
> +#define I8042_BUFFER_SIZE 16
> +
> +static void i8042_flush(void)
> +{
> + int i;
> +
> + while ((i8042_read_status() & I8042_STR_OBF)
> + && (i < I8042_BUFFER_SIZE)) {
> + udelay(50);
> + i8042_read_data();
> + i++;
> + }
> +}
> +
> +static int yeeloong_hotkey_init(struct device *dev)
> +{
> + int ret;
> + struct key_entry *key;
> +
> + /* flush the buffer of keyboard */
> + i8042_flush();
Why??? Why does this driver tries to touch stuff that does not belong to
it?
> +
> + /* setup the system control interface */
> + setup_sci();
No failures?
> +
> + yeeloong_hotkey_dev = input_allocate_device();
> +
> + if (!yeeloong_hotkey_dev)
> + return -ENOMEM;
Error unwinding?
> +
> + yeeloong_hotkey_dev->name = "HotKeys";
> + yeeloong_hotkey_dev->phys = "button/input0";
> + yeeloong_hotkey_dev->id.bustype = BUS_HOST;
> + yeeloong_hotkey_dev->dev.parent = dev;
> +
> + for (key = yeeloong_keymap; key->type != KE_END; key++) {
> + switch (key->type) {
> + case KE_KEY:
> + set_bit(EV_KEY, yeeloong_hotkey_dev->evbit);
> + set_bit(key->keycode, yeeloong_hotkey_dev->keybit);
> + break;
> + case KE_SW:
> + set_bit(EV_SW, yeeloong_hotkey_dev->evbit);
> + set_bit(key->keycode, yeeloong_hotkey_dev->swbit);
> + break;
> + }
> + }
> +
> + ret = input_register_device(yeeloong_hotkey_dev);
> + if (ret) {
> + input_free_device(yeeloong_hotkey_dev);
> + return ret;
> + }
--
Dmitry
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