auxdisplay: ht16k33: Driver for LED controller
Added a driver for the Holtek HT16K33 LED controller with keyscan. Signed-off-by: Robin van der Gracht <robin@protonic.nl> CC: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robin van der Gracht
Greg Kroah-Hartman
Родитель
7279b238ba
Коммит
8992da44c6
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@ -0,0 +1,42 @@
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Holtek ht16k33 RAM mapping 16*8 LED controller driver with keyscan
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-------------------------------------------------------------------------------
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Required properties:
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- compatible: "holtek,ht16k33"
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- reg: I2C slave address of the chip.
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- interrupt-parent: A phandle pointing to the interrupt controller
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serving the interrupt for this chip.
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- interrupts: Interrupt specification for the key pressed interrupt.
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- refresh-rate-hz: Display update interval in HZ.
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- debounce-delay-ms: Debouncing interval time in milliseconds.
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- linux,keymap: The keymap for keys as described in the binding
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document (devicetree/bindings/input/matrix-keymap.txt).
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Optional properties:
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- linux,no-autorepeat: Disable keyrepeat.
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- default-brightness-level: Initial brightness level [0-15] (default: 15).
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Example:
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&i2c1 {
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ht16k33: ht16k33@70 {
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compatible = "holtek,ht16k33";
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reg = <0x70>;
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refresh-rate-hz = <20>;
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debounce-delay-ms = <50>;
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interrupt-parent = <&gpio4>;
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interrupts = <5 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>;
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linux,keymap = <
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MATRIX_KEY(2, 0, KEY_F6)
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MATRIX_KEY(3, 0, KEY_F8)
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MATRIX_KEY(4, 0, KEY_F10)
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MATRIX_KEY(5, 0, KEY_F4)
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MATRIX_KEY(6, 0, KEY_F2)
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MATRIX_KEY(2, 1, KEY_F5)
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MATRIX_KEY(3, 1, KEY_F7)
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MATRIX_KEY(4, 1, KEY_F9)
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MATRIX_KEY(5, 1, KEY_F3)
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MATRIX_KEY(6, 1, KEY_F1)
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>;
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};
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};
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@ -128,4 +128,13 @@ config IMG_ASCII_LCD
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development boards such as the MIPS Boston, MIPS Malta & MIPS SEAD3
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from Imagination Technologies.
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config HT16K33
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tristate "Holtek Ht16K33 LED controller with keyscan"
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depends on FB && OF && I2C && INPUT
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select INPUT_MATRIXKMAP
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select FB_BACKLIGHT
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help
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Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
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LED controller driver with keyscan.
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endif # AUXDISPLAY
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@ -5,3 +5,4 @@
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obj-$(CONFIG_KS0108) += ks0108.o
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obj-$(CONFIG_CFAG12864B) += cfag12864b.o cfag12864bfb.o
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obj-$(CONFIG_IMG_ASCII_LCD) += img-ascii-lcd.o
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obj-$(CONFIG_HT16K33) += ht16k33.o
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@ -0,0 +1,563 @@
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/*
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* HT16K33 driver
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*
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* Author: Robin van der Gracht <robin@protonic.nl>
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*
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* Copyright: (C) 2016 Protonic Holland.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/of.h>
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#include <linux/fb.h>
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#include <linux/slab.h>
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#include <linux/backlight.h>
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#include <linux/input.h>
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#include <linux/input/matrix_keypad.h>
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#include <linux/workqueue.h>
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#include <linux/mm.h>
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/* Registers */
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#define REG_SYSTEM_SETUP 0x20
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#define REG_SYSTEM_SETUP_OSC_ON BIT(0)
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#define REG_DISPLAY_SETUP 0x80
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#define REG_DISPLAY_SETUP_ON BIT(0)
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#define REG_ROWINT_SET 0xA0
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#define REG_ROWINT_SET_INT_EN BIT(0)
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#define REG_ROWINT_SET_INT_ACT_HIGH BIT(1)
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#define REG_BRIGHTNESS 0xE0
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/* Defines */
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#define DRIVER_NAME "ht16k33"
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#define MIN_BRIGHTNESS 0x1
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#define MAX_BRIGHTNESS 0x10
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#define HT16K33_MATRIX_LED_MAX_COLS 8
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#define HT16K33_MATRIX_LED_MAX_ROWS 16
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#define HT16K33_MATRIX_KEYPAD_MAX_COLS 3
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#define HT16K33_MATRIX_KEYPAD_MAX_ROWS 12
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#define BYTES_PER_ROW (HT16K33_MATRIX_LED_MAX_ROWS / 8)
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#define HT16K33_FB_SIZE (HT16K33_MATRIX_LED_MAX_COLS * BYTES_PER_ROW)
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struct ht16k33_keypad {
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struct input_dev *dev;
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spinlock_t lock;
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struct delayed_work work;
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uint32_t cols;
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uint32_t rows;
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uint32_t row_shift;
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uint32_t debounce_ms;
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uint16_t last_key_state[HT16K33_MATRIX_KEYPAD_MAX_COLS];
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};
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struct ht16k33_fbdev {
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struct fb_info *info;
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uint32_t refresh_rate;
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uint8_t *buffer;
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uint8_t *cache;
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struct delayed_work work;
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};
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struct ht16k33_priv {
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struct i2c_client *client;
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struct ht16k33_keypad keypad;
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struct ht16k33_fbdev fbdev;
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struct workqueue_struct *workqueue;
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};
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static struct fb_fix_screeninfo ht16k33_fb_fix = {
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.id = DRIVER_NAME,
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_MONO10,
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.xpanstep = 0,
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.ypanstep = 0,
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.ywrapstep = 0,
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.line_length = HT16K33_MATRIX_LED_MAX_ROWS,
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.accel = FB_ACCEL_NONE,
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};
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static struct fb_var_screeninfo ht16k33_fb_var = {
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.xres = HT16K33_MATRIX_LED_MAX_ROWS,
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.yres = HT16K33_MATRIX_LED_MAX_COLS,
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.xres_virtual = HT16K33_MATRIX_LED_MAX_ROWS,
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.yres_virtual = HT16K33_MATRIX_LED_MAX_COLS,
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.bits_per_pixel = 1,
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.red = { 0, 1, 0 },
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.green = { 0, 1, 0 },
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.blue = { 0, 1, 0 },
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.left_margin = 0,
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.right_margin = 0,
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.upper_margin = 0,
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.lower_margin = 0,
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.vmode = FB_VMODE_NONINTERLACED,
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};
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static int ht16k33_display_on(struct ht16k33_priv *priv)
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{
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uint8_t data = REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON;
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return i2c_smbus_write_byte(priv->client, data);
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}
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static int ht16k33_display_off(struct ht16k33_priv *priv)
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{
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return i2c_smbus_write_byte(priv->client, REG_DISPLAY_SETUP);
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}
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static void ht16k33_fb_queue(struct ht16k33_priv *priv)
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{
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struct ht16k33_fbdev *fbdev = &priv->fbdev;
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queue_delayed_work(priv->workqueue, &fbdev->work,
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msecs_to_jiffies(HZ / fbdev->refresh_rate));
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}
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static void ht16k33_keypad_queue(struct ht16k33_priv *priv)
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{
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struct ht16k33_keypad *keypad = &priv->keypad;
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queue_delayed_work(priv->workqueue, &keypad->work,
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msecs_to_jiffies(keypad->debounce_ms));
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}
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/*
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* This gets the fb data from cache and copies it to ht16k33 display RAM
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*/
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static void ht16k33_fb_update(struct work_struct *work)
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{
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struct ht16k33_fbdev *fbdev =
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container_of(work, struct ht16k33_fbdev, work.work);
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struct ht16k33_priv *priv =
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container_of(fbdev, struct ht16k33_priv, fbdev);
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uint8_t *p1, *p2;
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int len, pos = 0, first = -1;
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p1 = fbdev->cache;
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p2 = fbdev->buffer;
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/* Search for the first byte with changes */
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while (pos < HT16K33_FB_SIZE && first < 0) {
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if (*(p1++) - *(p2++))
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first = pos;
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pos++;
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}
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/* No changes found */
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if (first < 0)
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goto requeue;
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len = HT16K33_FB_SIZE - first;
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p1 = fbdev->cache + HT16K33_FB_SIZE - 1;
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p2 = fbdev->buffer + HT16K33_FB_SIZE - 1;
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/* Determine i2c transfer length */
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while (len > 1) {
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if (*(p1--) - *(p2--))
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break;
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len--;
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}
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p1 = fbdev->cache + first;
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p2 = fbdev->buffer + first;
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if (!i2c_smbus_write_i2c_block_data(priv->client, first, len, p2))
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memcpy(p1, p2, len);
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requeue:
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ht16k33_fb_queue(priv);
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}
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static int ht16k33_keypad_start(struct input_dev *dev)
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{
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struct ht16k33_priv *priv = input_get_drvdata(dev);
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struct ht16k33_keypad *keypad = &priv->keypad;
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/*
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* Schedule an immediate key scan to capture current key state;
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* columns will be activated and IRQs be enabled after the scan.
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*/
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queue_delayed_work(priv->workqueue, &keypad->work, 0);
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return 0;
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}
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static void ht16k33_keypad_stop(struct input_dev *dev)
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{
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struct ht16k33_priv *priv = input_get_drvdata(dev);
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struct ht16k33_keypad *keypad = &priv->keypad;
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cancel_delayed_work(&keypad->work);
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/*
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* ht16k33_keypad_scan() will leave IRQs enabled;
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* we should disable them now.
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*/
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disable_irq_nosync(priv->client->irq);
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}
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static int ht16k33_initialize(struct ht16k33_priv *priv)
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{
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uint8_t byte;
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int err;
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uint8_t data[HT16K33_MATRIX_LED_MAX_COLS * 2];
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/* Clear RAM (8 * 16 bits) */
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memset(data, 0, sizeof(data));
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err = i2c_smbus_write_block_data(priv->client, 0, sizeof(data), data);
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if (err)
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return err;
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/* Turn on internal oscillator */
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byte = REG_SYSTEM_SETUP_OSC_ON | REG_SYSTEM_SETUP;
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err = i2c_smbus_write_byte(priv->client, byte);
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if (err)
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return err;
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/* Configure INT pin */
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byte = REG_ROWINT_SET | REG_ROWINT_SET_INT_ACT_HIGH;
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if (priv->client->irq > 0)
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byte |= REG_ROWINT_SET_INT_EN;
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return i2c_smbus_write_byte(priv->client, byte);
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}
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/*
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* This gets the keys from keypad and reports it to input subsystem
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*/
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static void ht16k33_keypad_scan(struct work_struct *work)
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{
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struct ht16k33_keypad *keypad =
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container_of(work, struct ht16k33_keypad, work.work);
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struct ht16k33_priv *priv =
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container_of(keypad, struct ht16k33_priv, keypad);
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const unsigned short *keycodes = keypad->dev->keycode;
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uint16_t bits_changed, new_state[HT16K33_MATRIX_KEYPAD_MAX_COLS];
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uint8_t data[HT16K33_MATRIX_KEYPAD_MAX_COLS * 2];
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int row, col, code;
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bool reschedule = false;
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if (i2c_smbus_read_i2c_block_data(priv->client, 0x40, 6, data) != 6) {
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dev_err(&priv->client->dev, "Failed to read key data\n");
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goto end;
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}
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for (col = 0; col < keypad->cols; col++) {
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new_state[col] = (data[col * 2 + 1] << 8) | data[col * 2];
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if (new_state[col])
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reschedule = true;
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bits_changed = keypad->last_key_state[col] ^ new_state[col];
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while (bits_changed) {
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row = ffs(bits_changed) - 1;
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code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
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input_event(keypad->dev, EV_MSC, MSC_SCAN, code);
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input_report_key(keypad->dev, keycodes[code],
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new_state[col] & BIT(row));
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bits_changed &= ~BIT(row);
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}
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}
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input_sync(keypad->dev);
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memcpy(keypad->last_key_state, new_state, sizeof(new_state));
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end:
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if (reschedule)
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ht16k33_keypad_queue(priv);
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else
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enable_irq(priv->client->irq);
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}
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static irqreturn_t ht16k33_irq_thread(int irq, void *dev)
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{
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struct ht16k33_priv *priv = dev;
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disable_irq_nosync(priv->client->irq);
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ht16k33_keypad_queue(priv);
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return IRQ_HANDLED;
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}
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static int ht16k33_bl_update_status(struct backlight_device *bl)
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{
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int brightness = bl->props.brightness;
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struct ht16k33_priv *priv = bl_get_data(bl);
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if (bl->props.power != FB_BLANK_UNBLANK ||
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bl->props.fb_blank != FB_BLANK_UNBLANK ||
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bl->props.state & BL_CORE_FBBLANK || brightness == 0) {
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return ht16k33_display_off(priv);
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}
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ht16k33_display_on(priv);
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return i2c_smbus_write_byte(priv->client,
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REG_BRIGHTNESS | (brightness - 1));
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}
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static int ht16k33_bl_check_fb(struct backlight_device *bl, struct fb_info *fi)
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{
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struct ht16k33_priv *priv = bl_get_data(bl);
|
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return (fi == NULL) || (fi->par == priv);
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}
|
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static const struct backlight_ops ht16k33_bl_ops = {
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.update_status = ht16k33_bl_update_status,
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.check_fb = ht16k33_bl_check_fb,
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};
|
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|
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static int ht16k33_mmap(struct fb_info *info, struct vm_area_struct *vma)
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{
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struct ht16k33_priv *priv = info->par;
|
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|
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return vm_insert_page(vma, vma->vm_start,
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virt_to_page(priv->fbdev.buffer));
|
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}
|
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static struct fb_ops ht16k33_fb_ops = {
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.owner = THIS_MODULE,
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.fb_read = fb_sys_read,
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.fb_write = fb_sys_write,
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.fb_fillrect = sys_fillrect,
|
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.fb_copyarea = sys_copyarea,
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.fb_imageblit = sys_imageblit,
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.fb_mmap = ht16k33_mmap,
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};
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|
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static int ht16k33_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
|
||||
int err;
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uint32_t rows, cols, dft_brightness;
|
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struct backlight_device *bl;
|
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struct backlight_properties bl_props;
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struct ht16k33_priv *priv;
|
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struct ht16k33_keypad *keypad;
|
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struct ht16k33_fbdev *fbdev;
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struct device_node *node = client->dev.of_node;
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||||
|
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
|
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dev_err(&client->dev, "i2c_check_functionality error\n");
|
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return -EIO;
|
||||
}
|
||||
|
||||
if (client->irq <= 0) {
|
||||
dev_err(&client->dev, "No IRQ specified\n");
|
||||
return -EINVAL;
|
||||
}
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||||
|
||||
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
|
||||
if (!priv)
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return -ENOMEM;
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|
||||
priv->client = client;
|
||||
i2c_set_clientdata(client, priv);
|
||||
fbdev = &priv->fbdev;
|
||||
keypad = &priv->keypad;
|
||||
|
||||
priv->workqueue = create_singlethread_workqueue(DRIVER_NAME "-wq");
|
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if (priv->workqueue == NULL)
|
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return -ENOMEM;
|
||||
|
||||
err = ht16k33_initialize(priv);
|
||||
if (err)
|
||||
goto err_destroy_wq;
|
||||
|
||||
/* Framebuffer (2 bytes per column) */
|
||||
BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE);
|
||||
fbdev->buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL);
|
||||
if (!fbdev->buffer) {
|
||||
err = -ENOMEM;
|
||||
goto err_free_fbdev;
|
||||
}
|
||||
|
||||
fbdev->cache = devm_kmalloc(&client->dev, HT16K33_FB_SIZE, GFP_KERNEL);
|
||||
if (!fbdev->cache) {
|
||||
err = -ENOMEM;
|
||||
goto err_fbdev_buffer;
|
||||
}
|
||||
|
||||
fbdev->info = framebuffer_alloc(0, &client->dev);
|
||||
if (!fbdev->info) {
|
||||
err = -ENOMEM;
|
||||
goto err_fbdev_buffer;
|
||||
}
|
||||
|
||||
err = of_property_read_u32(node, "refresh-rate-hz",
|
||||
&fbdev->refresh_rate);
|
||||
if (err) {
|
||||
dev_err(&client->dev, "refresh rate not specified\n");
|
||||
goto err_fbdev_info;
|
||||
}
|
||||
fb_bl_default_curve(fbdev->info, 0, MIN_BRIGHTNESS, MAX_BRIGHTNESS);
|
||||
|
||||
INIT_DELAYED_WORK(&fbdev->work, ht16k33_fb_update);
|
||||
fbdev->info->fbops = &ht16k33_fb_ops;
|
||||
fbdev->info->screen_base = (char __iomem *) fbdev->buffer;
|
||||
fbdev->info->screen_size = HT16K33_FB_SIZE;
|
||||
fbdev->info->fix = ht16k33_fb_fix;
|
||||
fbdev->info->var = ht16k33_fb_var;
|
||||
fbdev->info->pseudo_palette = NULL;
|
||||
fbdev->info->flags = FBINFO_FLAG_DEFAULT;
|
||||
fbdev->info->par = priv;
|
||||
|
||||
err = register_framebuffer(fbdev->info);
|
||||
if (err)
|
||||
goto err_fbdev_info;
|
||||
|
||||
/* Keypad */
|
||||
keypad->dev = devm_input_allocate_device(&client->dev);
|
||||
if (!keypad->dev) {
|
||||
err = -ENOMEM;
|
||||
goto err_fbdev_unregister;
|
||||
}
|
||||
|
||||
keypad->dev->name = DRIVER_NAME"-keypad";
|
||||
keypad->dev->id.bustype = BUS_I2C;
|
||||
keypad->dev->open = ht16k33_keypad_start;
|
||||
keypad->dev->close = ht16k33_keypad_stop;
|
||||
|
||||
if (!of_get_property(node, "linux,no-autorepeat", NULL))
|
||||
__set_bit(EV_REP, keypad->dev->evbit);
|
||||
|
||||
err = of_property_read_u32(node, "debounce-delay-ms",
|
||||
&keypad->debounce_ms);
|
||||
if (err) {
|
||||
dev_err(&client->dev, "key debounce delay not specified\n");
|
||||
goto err_fbdev_unregister;
|
||||
}
|
||||
|
||||
err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
|
||||
ht16k33_irq_thread,
|
||||
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
|
||||
DRIVER_NAME, priv);
|
||||
if (err) {
|
||||
dev_err(&client->dev, "irq request failed %d, error %d\n",
|
||||
client->irq, err);
|
||||
goto err_fbdev_unregister;
|
||||
}
|
||||
|
||||
disable_irq_nosync(client->irq);
|
||||
rows = HT16K33_MATRIX_KEYPAD_MAX_ROWS;
|
||||
cols = HT16K33_MATRIX_KEYPAD_MAX_COLS;
|
||||
err = matrix_keypad_parse_of_params(&client->dev, &rows, &cols);
|
||||
if (err)
|
||||
goto err_fbdev_unregister;
|
||||
|
||||
err = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL,
|
||||
keypad->dev);
|
||||
if (err) {
|
||||
dev_err(&client->dev, "failed to build keymap\n");
|
||||
goto err_fbdev_unregister;
|
||||
}
|
||||
|
||||
input_set_drvdata(keypad->dev, priv);
|
||||
keypad->rows = rows;
|
||||
keypad->cols = cols;
|
||||
keypad->row_shift = get_count_order(cols);
|
||||
INIT_DELAYED_WORK(&keypad->work, ht16k33_keypad_scan);
|
||||
|
||||
err = input_register_device(keypad->dev);
|
||||
if (err)
|
||||
goto err_fbdev_unregister;
|
||||
|
||||
/* Backlight */
|
||||
memset(&bl_props, 0, sizeof(struct backlight_properties));
|
||||
bl_props.type = BACKLIGHT_RAW;
|
||||
bl_props.max_brightness = MAX_BRIGHTNESS;
|
||||
|
||||
bl = devm_backlight_device_register(&client->dev, DRIVER_NAME"-bl",
|
||||
&client->dev, priv,
|
||||
&ht16k33_bl_ops, &bl_props);
|
||||
if (IS_ERR(bl)) {
|
||||
dev_err(&client->dev, "failed to register backlight\n");
|
||||
err = PTR_ERR(bl);
|
||||
goto err_keypad_unregister;
|
||||
}
|
||||
|
||||
err = of_property_read_u32(node, "default-brightness-level",
|
||||
&dft_brightness);
|
||||
if (err) {
|
||||
dft_brightness = MAX_BRIGHTNESS;
|
||||
} else if (dft_brightness > MAX_BRIGHTNESS) {
|
||||
dev_warn(&client->dev,
|
||||
"invalid default brightness level: %u, using %u\n",
|
||||
dft_brightness, MAX_BRIGHTNESS);
|
||||
dft_brightness = MAX_BRIGHTNESS;
|
||||
}
|
||||
|
||||
bl->props.brightness = dft_brightness;
|
||||
ht16k33_bl_update_status(bl);
|
||||
|
||||
ht16k33_fb_queue(priv);
|
||||
return 0;
|
||||
|
||||
err_keypad_unregister:
|
||||
input_unregister_device(keypad->dev);
|
||||
err_fbdev_unregister:
|
||||
unregister_framebuffer(fbdev->info);
|
||||
err_fbdev_info:
|
||||
framebuffer_release(fbdev->info);
|
||||
err_fbdev_buffer:
|
||||
free_page((unsigned long) fbdev->buffer);
|
||||
err_free_fbdev:
|
||||
kfree(fbdev);
|
||||
err_destroy_wq:
|
||||
destroy_workqueue(priv->workqueue);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static int ht16k33_remove(struct i2c_client *client)
|
||||
{
|
||||
struct ht16k33_priv *priv = i2c_get_clientdata(client);
|
||||
struct ht16k33_keypad *keypad = &priv->keypad;
|
||||
struct ht16k33_fbdev *fbdev = &priv->fbdev;
|
||||
|
||||
ht16k33_keypad_stop(keypad->dev);
|
||||
|
||||
cancel_delayed_work(&fbdev->work);
|
||||
unregister_framebuffer(fbdev->info);
|
||||
framebuffer_release(fbdev->info);
|
||||
free_page((unsigned long) fbdev->buffer);
|
||||
|
||||
destroy_workqueue(priv->workqueue);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id ht16k33_i2c_match[] = {
|
||||
{ "ht16k33", 0 },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, ht16k33_i2c_match);
|
||||
|
||||
static const struct of_device_id ht16k33_of_match[] = {
|
||||
{ .compatible = "holtek,ht16k33", },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, ht16k33_of_match);
|
||||
|
||||
static struct i2c_driver ht16k33_driver = {
|
||||
.probe = ht16k33_probe,
|
||||
.remove = ht16k33_remove,
|
||||
.driver = {
|
||||
.name = DRIVER_NAME,
|
||||
.of_match_table = of_match_ptr(ht16k33_of_match),
|
||||
},
|
||||
.id_table = ht16k33_i2c_match,
|
||||
};
|
||||
module_i2c_driver(ht16k33_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Holtek HT16K33 driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Robin van der Gracht <robin@protonic.nl>");
|
||||
Загрузка…
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