RE: [PATCH 1/1] input: tegra-kbc - Add tegra keyboard driver

From: Rakesh Iyer
Date: Wed Jan 05 2011 - 17:04:35 EST

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In reply to: Trilok Soni: "Re: [PATCH 1/1] input: tegra-kbc - Add tegra keyboard driver"
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Hello Trilok.

Thanks for the review.
Most of your comments are being worked on right now.
I have responses to a couple of your comments.

Comment 1
>
> > + int *plain_keycode;
> > + int *fn_keycode;
> > + struct hrtimer timer;
> > + struct clk *clk;
> > +};
> > +
> > +static int plain_kbd_keycode[] = {
> > + /*
> > + * Row 0 Unused, Unused, 'W', 'S', 'A', 'Z', Unused, Function,
> > + * Row 1 Unused, Unused, Unused, Unused, Unused, Unused, Unused, Menu
> > + * Row 2 Unused, Unused, Unused, Unused, Unused, Unused, Alt, Alt2
> > + * Row 3 '5', '4', 'R', 'E', 'F', 'D', 'X', Unused,
> > + * Row 4 '7', '6', 'T', 'H', 'G', 'V', 'C', SPACEBAR,
> > + * Row 5 '9', '8', 'U', 'Y', 'J', 'N', 'B', '|\',
> > + * Row 6 Minus, '0', 'O', 'I', 'L', 'K', '<', M,
> > + * Row 7 Unused, '+', '}]', '#', Unused, Unused, Unused, Menu,
> > + * Row 8 Unused, Unused, Unused, Unused, SHIFT, SHIFT, Unused, Unused,
> > + * Row 9 Unused, Unused, Unused, Unused, Unused, Ctrl, Unused, Ctrl,
> > + * Row A Unused, Unused, Unused, Unused, Unused, Unused, Unused, Unused,
> > + * Row B '{[', 'P', '"', ':;', '/?, '>', Unused, Unused,
> > + * Row C 'F10', 'F9', 'BckSpc', '3', '2', Up, Prntscr, Pause
> > + * Row D INS, DEL, Unused, Pgup, PgDn, right, Down, Left,
> > + * Row E F11, F12, F8, 'Q', F4, F3, '1', F7,
> > + * Row F ESC, '~', F5, TAB, F1, F2, CAPLOCK, F6,
> > + */
> > + KEY_RESERVED, KEY_RESERVED, KEY_W, KEY_S,
> > + KEY_A, KEY_Z, KEY_RESERVED, KEY_FN,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_MENU,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RIGHTALT,
> KEY_LEFTALT,
> > + KEY_5, KEY_4, KEY_R, KEY_E,
> > + KEY_F, KEY_D, KEY_X, KEY_RESERVED,
> > + KEY_7, KEY_6, KEY_T, KEY_H,
> > + KEY_G, KEY_V, KEY_C, KEY_SPACE,
> > + KEY_9, KEY_8, KEY_U, KEY_Y,
> > + KEY_J, KEY_N, KEY_B, KEY_BACKSLASH,
> > + KEY_MINUS, KEY_0, KEY_O, KEY_I,
> > + KEY_L, KEY_K, KEY_COMMA, KEY_M,
> > + KEY_RESERVED, KEY_EQUAL, KEY_RIGHTBRACE, KEY_ENTER,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_MENU,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RIGHTSHIFT, KEY_LEFTSHIFT, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RIGHTCTRL, KEY_RESERVED,
> KEY_LEFTCTRL,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_LEFTBRACE, KEY_P, KEY_APOSTROPHE, KEY_SEMICOLON,
> > + KEY_SLASH, KEY_DOT, KEY_RESERVED, KEY_RESERVED,
> > + KEY_F10, KEY_F9, KEY_BACKSPACE, KEY_3,
> > + KEY_2, KEY_UP, KEY_PRINT, KEY_PAUSE,
> > + KEY_INSERT, KEY_DELETE, KEY_RESERVED, KEY_PAGEUP,
> > + KEY_PAGEDOWN, KEY_RIGHT, KEY_DOWN, KEY_LEFT,
> > + KEY_F11, KEY_F12, KEY_F8, KEY_Q,
> > + KEY_F4, KEY_F3, KEY_1, KEY_F7,
> > + KEY_ESC, KEY_GRAVE, KEY_F5, KEY_TAB,
> > + KEY_F1, KEY_F2, KEY_CAPSLOCK, KEY_F6
> > +};
> > +
> > +static int fn_kbd_keycode[] = {
> > + /*
> > + * Row 0 Unused, Unused, 'W', 'S', 'A', 'Z', Unused, Function,
> > + * Row 1 Special, Unused, Unused, Unused, Unused, Unused, Unused, Menu
> > + * Row 2 Unused, Unused, Unused, Unused, Unused, Unused, Alt, Alt2
> > + * Row 3 '5', '4', 'R', 'E', 'F', 'D', 'X', Unused,
> > + * Row 4 '7', '6', 'T', 'H', 'G', 'V', 'C', SPACEBAR,
> > + * Row 5 '9', '8', 'U', 'Y', 'J', 'N', 'B', '|\',
> > + * Row 6 Minus, '0', 'O', 'I', 'L', 'K', '<', M,
> > + * Row 7 Unused, '+', '}]', '#', Unused, Unused, Unused, Menu,
> > + * Row 8 Unused, Unused, Unused, Unused, SHIFT, SHIFT, Unused, Unused,
> > + * Row 9 Unused, Unused, Unused, Unused, Unused, Ctrl, Unused, Control,
> > + * Row A Unused, Unused, Unused, Unused, Unused, Unused, Unused, Unused,
> > + * Row B '{[', 'P', '"', ':;', '/?, '>', Unused, Unused,
> > + * Row C 'F10', 'F9', 'BckSpc', '3', '2', 'Up, Prntscr, Pause
> > + * Row D INS, DEL, Unused, Pgup, PgDn, right, Down, Left,
> > + * Row E F11, F12, F8, 'Q', F4, F3, '1', F7,
> > + * Row F ESC, '~', F5, TAB, F1, F2, CAPLOCK, F6,
> > + */
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_7, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_9, KEY_8, KEY_4, KEY_RESERVED,
> > + KEY_1, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_SLASH, KEY_6, KEY_5,
> > + KEY_3, KEY_2, KEY_RESERVED, KEY_0,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_KPASTERISK, KEY_RESERVED, KEY_KPMINUS,
> > + KEY_KPPLUS, KEY_DOT, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_RESERVED, KEY_VOLUMEUP, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_HOME,
> > + KEY_END, KEY_BRIGHTNESSUP, KEY_VOLUMEDOWN,
> KEY_BRIGHTNESSDOWN,
> > + KEY_NUMLOCK, KEY_SCROLLLOCK, KEY_MUTE, KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED,
> > + KEY_RESERVED, KEY_RESERVED, KEY_RESERVED, KEY_RESERVED,
> > + KEY_QUESTION, KEY_RESERVED, KEY_RESERVED,
> KEY_RESERVED
> > +};
> > +
> > +static int tegra_kbc_keycode(struct tegra_kbc *kbc, int r, int c, bool fn_key)
> > +{
> > + if (!fn_key)
> > + return kbc->plain_keycode[(r * KBC_MAX_COL) + c];
> > + else
> > + return kbc->fn_keycode[(r * KBC_MAX_COL) + c];
> > +}
> > +
> > +#ifdef CONFIG_PM
> > +static int tegra_kbc_open(struct input_dev *dev);
> > +static void tegra_kbc_close(struct input_dev *dev);
> > +static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter);
> > +
>
> I don't understand why these are here, why can't we re-arrange them in such
> a way that above is not required.
>

I am assuming the comment is to question the need for 'tegra_kbc_keycode'.
The keyboard driver can only determine the row and column of the keypress from the hardware and needs the translation to a value.
So we cannot get rid of the translation mechanism. This routine also allows a simpler processing of the function keymaps, so that the multiple callers are kept simple.

Comment 2

> > +
> > + valid = 0;
> > + for (i = 0; i < KBC_MAX_KPENT; i++) {
> > + if (!(i&3))
> > + kp_ent = *kp_ents++;
> > +
> > + if (kp_ent & 0x80) {
> > + cols_val[valid] = kp_ent & 0x7;
> > + rows_val[valid++] = (kp_ent >> 3) & 0xf;
> > + }
> > + kp_ent >>= 8;
> > + }
> > +
> > + for (i = 0; i < valid; i++) {
> > + int k = tegra_kbc_keycode(kbc, rows_val[i], cols_val[i], false);
> > + if (k == KEY_FN) {
> > + fn = true;
> > + break;
> > + }
> > + }
> > +
> > + j = 0;
> > + for (i = 0; i < valid; i++) {
> > + int k = tegra_kbc_keycode(kbc, rows_val[i], cols_val[i], fn);
> > + if (likely(k != -1))
> > + curr_fifo[j++] = k;
> > + }
> > + valid = j;
> > +
> > + for (i = 0; i < KBC_MAX_KPENT; i++) {
> > + if (fifo[i] == -1)
> > + continue;
> > + for (j = 0; j < valid; j++) {
> > + if (curr_fifo[j] == fifo[i]) {
> > + curr_fifo[j] = -1;
> > + break;
> > + }
> > + }
> > + if (j == valid) {
> > + input_report_key(kbc->idev, fifo[i], 0);
> > + fifo[i] = -1;
> > + }
> > + }
> > + for (j = 0; j < valid; j++) {
> > + if (curr_fifo[j] == -1)
> > + continue;
> > + for (i = 0; i < KBC_MAX_KPENT; i++) {
> > + if (fifo[i] == -1)
> > + break;
> > + }
> > + if (i != KBC_MAX_KPENT) {
> > + fifo[i] = curr_fifo[j];
> > + input_report_key(kbc->idev, fifo[i], 1);
> > + } else
> > + WARN_ON(1);
> > + }
> > +}
> > +
> > +static enum hrtimer_restart tegra_kbc_key_repeat_timer(struct hrtimer *handle)
> > +{
> > + struct tegra_kbc *kbc;
> > + unsigned long flags;
> > + u32 val;
> > + int i;
> > +
> > + kbc = container_of(handle, struct tegra_kbc, timer);
> > +
> > + val = (readl(kbc->mmio + KBC_INT_0) >> 4) & 0xf;
> > + if (val) {
> > + unsigned long dly;
> > +
> > + tegra_kbc_report_keys(kbc, kbc->fifo);
> > +
> > + dly = ((val == 1) ? kbc->repoll_time : 1) * 1000000;
> > + hrtimer_start(&kbc->timer, ktime_set(0, dly), HRTIMER_MODE_REL);
> > + } else {
> > + /* release any pressed keys and exit the loop */
> > + for (i = 0; i < ARRAY_SIZE(kbc->fifo); i++) {
> > + if (kbc->fifo[i] == -1)
> > + continue;
> > + input_report_key(kbc->idev, kbc->fifo[i], 0);
> > + kbc->fifo[i] = -1;
> > + }
> > +
> > + /* All keys are released so enable the keypress interrupt */
> > + spin_lock_irqsave(&kbc->lock, flags);
> > + val = readl(kbc->mmio + KBC_CONTROL_0);
> > + val |= (1<<3);
> > + writel(val, kbc->mmio + KBC_CONTROL_0);
> > + spin_unlock_irqrestore(&kbc->lock, flags);
> > + }
> > + return HRTIMER_NORESTART;
> > +}
> > +
> > +static void tegra_kbc_close(struct input_dev *dev)
> > +{
> > + struct tegra_kbc *kbc = input_get_drvdata(dev);
> > + unsigned long flags;
> > + u32 val;
> > +
> > + spin_lock_irqsave(&kbc->lock, flags);
> > + val = readl(kbc->mmio + KBC_CONTROL_0);
> > + val &= ~1;
> > + writel(val, kbc->mmio + KBC_CONTROL_0);
> > + spin_unlock_irqrestore(&kbc->lock, flags);
> > +
> > + clk_disable(kbc->clk);
> > +}
> > +
> > +static void tegra_kbc_setup_wakekeys(struct tegra_kbc *kbc, bool filter)
> > +{
> > + int i;
> > + unsigned int rst_val;
> > +
> > + BUG_ON(kbc->pdata->wake_cnt > KBC_MAX_KEY);
> > + rst_val = (filter && kbc->pdata->wake_cnt) ? ~0 : 0;
> > +
> > + for (i = 0; i < KBC_MAX_ROW; i++)
> > + writel(rst_val, kbc->mmio+KBC_ROW0_MASK_0+i*4);
> > +
> > + if (filter) {
> > + for (i = 0; i < kbc->pdata->wake_cnt; i++) {
> > + u32 val, addr;
> > + addr = kbc->pdata->wake_cfg[i].row*4 + KBC_ROW0_MASK_0;
> > + val = readl(kbc->mmio + addr);
> > + val &= ~(1<<kbc->pdata->wake_cfg[i].col);
> > + writel(val, kbc->mmio + addr);
> > + }
> > + }
> > +}
>
> could you please explain this functionality in detail? Are you making only selectable
> keys to be able to wakeup system and not all?
>
Yes, we are making only selectable keys wakeup the system. A 1 bit for a particular 'row,column' indicates that 'row,column' is disabled during suspend.
The keys that are allowed to wake the system are decided per board and are specified in pdata->wake_cfg.

Please let me know if this is okay. I will incorporate the remaining comments and send out a new patch after successful testing.

Thanks and Regards
Rakesh
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Next message: Pavel Machek: "Re: Linux 2.6.37-rc8"
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In reply to: Trilok Soni: "Re: [PATCH 1/1] input: tegra-kbc - Add tegra keyboard driver"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]