^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * HT16K33 driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Author: Robin van der Gracht <robin@protonic.nl>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright: (C) 2016 Protonic Holland.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/fb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/input.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/input/matrix_keypad.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/workqueue.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /* Registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define REG_SYSTEM_SETUP 0x20
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define REG_SYSTEM_SETUP_OSC_ON BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define REG_DISPLAY_SETUP 0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define REG_DISPLAY_SETUP_ON BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define REG_ROWINT_SET 0xA0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define REG_ROWINT_SET_INT_EN BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define REG_ROWINT_SET_INT_ACT_HIGH BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define REG_BRIGHTNESS 0xE0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /* Defines */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #define DRIVER_NAME "ht16k33"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define MIN_BRIGHTNESS 0x1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #define MAX_BRIGHTNESS 0x10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define HT16K33_MATRIX_LED_MAX_COLS 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #define HT16K33_MATRIX_LED_MAX_ROWS 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define HT16K33_MATRIX_KEYPAD_MAX_COLS 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #define HT16K33_MATRIX_KEYPAD_MAX_ROWS 12
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #define BYTES_PER_ROW (HT16K33_MATRIX_LED_MAX_ROWS / 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define HT16K33_FB_SIZE (HT16K33_MATRIX_LED_MAX_COLS * BYTES_PER_ROW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct ht16k33_keypad {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) struct input_dev *dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) uint32_t cols;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) uint32_t rows;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) uint32_t row_shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) uint32_t debounce_ms;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) uint16_t last_key_state[HT16K33_MATRIX_KEYPAD_MAX_COLS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) wait_queue_head_t wait;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) bool stopped;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct ht16k33_fbdev {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct fb_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) uint32_t refresh_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) uint8_t *buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) uint8_t *cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct delayed_work work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct ht16k33_priv {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct ht16k33_keypad keypad;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct ht16k33_fbdev fbdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) static const struct fb_fix_screeninfo ht16k33_fb_fix = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) .id = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) .type = FB_TYPE_PACKED_PIXELS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) .visual = FB_VISUAL_MONO10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .xpanstep = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) .ypanstep = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) .ywrapstep = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) .line_length = HT16K33_MATRIX_LED_MAX_ROWS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) .accel = FB_ACCEL_NONE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) static const struct fb_var_screeninfo ht16k33_fb_var = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) .xres = HT16K33_MATRIX_LED_MAX_ROWS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) .yres = HT16K33_MATRIX_LED_MAX_COLS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) .xres_virtual = HT16K33_MATRIX_LED_MAX_ROWS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .yres_virtual = HT16K33_MATRIX_LED_MAX_COLS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .bits_per_pixel = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) .red = { 0, 1, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) .green = { 0, 1, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) .blue = { 0, 1, 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) .left_margin = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) .right_margin = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) .upper_margin = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) .lower_margin = 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) .vmode = FB_VMODE_NONINTERLACED,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) static int ht16k33_display_on(struct ht16k33_priv *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) uint8_t data = REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) return i2c_smbus_write_byte(priv->client, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) static int ht16k33_display_off(struct ht16k33_priv *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) return i2c_smbus_write_byte(priv->client, REG_DISPLAY_SETUP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) static void ht16k33_fb_queue(struct ht16k33_priv *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct ht16k33_fbdev *fbdev = &priv->fbdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) schedule_delayed_work(&fbdev->work, HZ / fbdev->refresh_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) * This gets the fb data from cache and copies it to ht16k33 display RAM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static void ht16k33_fb_update(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) struct ht16k33_fbdev *fbdev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) container_of(work, struct ht16k33_fbdev, work.work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct ht16k33_priv *priv =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) container_of(fbdev, struct ht16k33_priv, fbdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) uint8_t *p1, *p2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) int len, pos = 0, first = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) p1 = fbdev->cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) p2 = fbdev->buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) /* Search for the first byte with changes */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) while (pos < HT16K33_FB_SIZE && first < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (*(p1++) - *(p2++))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) first = pos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) pos++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* No changes found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (first < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) goto requeue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) len = HT16K33_FB_SIZE - first;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) p1 = fbdev->cache + HT16K33_FB_SIZE - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) p2 = fbdev->buffer + HT16K33_FB_SIZE - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* Determine i2c transfer length */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) while (len > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (*(p1--) - *(p2--))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) p1 = fbdev->cache + first;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) p2 = fbdev->buffer + first;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) if (!i2c_smbus_write_i2c_block_data(priv->client, first, len, p2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) memcpy(p1, p2, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) requeue:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) ht16k33_fb_queue(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static int ht16k33_initialize(struct ht16k33_priv *priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) uint8_t byte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) uint8_t data[HT16K33_MATRIX_LED_MAX_COLS * 2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* Clear RAM (8 * 16 bits) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) memset(data, 0, sizeof(data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) err = i2c_smbus_write_block_data(priv->client, 0, sizeof(data), data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /* Turn on internal oscillator */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) byte = REG_SYSTEM_SETUP_OSC_ON | REG_SYSTEM_SETUP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) err = i2c_smbus_write_byte(priv->client, byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /* Configure INT pin */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) byte = REG_ROWINT_SET | REG_ROWINT_SET_INT_ACT_HIGH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (priv->client->irq > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) byte |= REG_ROWINT_SET_INT_EN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) return i2c_smbus_write_byte(priv->client, byte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static int ht16k33_bl_update_status(struct backlight_device *bl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) int brightness = bl->props.brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) struct ht16k33_priv *priv = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (bl->props.power != FB_BLANK_UNBLANK ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) bl->props.fb_blank != FB_BLANK_UNBLANK ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) bl->props.state & BL_CORE_FBBLANK || brightness == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) return ht16k33_display_off(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ht16k33_display_on(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) return i2c_smbus_write_byte(priv->client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) REG_BRIGHTNESS | (brightness - 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static int ht16k33_bl_check_fb(struct backlight_device *bl, struct fb_info *fi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) struct ht16k33_priv *priv = bl_get_data(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) return (fi == NULL) || (fi->par == priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static const struct backlight_ops ht16k33_bl_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) .update_status = ht16k33_bl_update_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) .check_fb = ht16k33_bl_check_fb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * Blank events will be passed to the actual device handling the backlight when
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * we return zero here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static int ht16k33_blank(int blank, struct fb_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) static int ht16k33_mmap(struct fb_info *info, struct vm_area_struct *vma)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) struct ht16k33_priv *priv = info->par;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) struct page *pages = virt_to_page(priv->fbdev.buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) return vm_map_pages_zero(vma, &pages, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static const struct fb_ops ht16k33_fb_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) .fb_read = fb_sys_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) .fb_write = fb_sys_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) .fb_blank = ht16k33_blank,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) .fb_fillrect = sys_fillrect,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) .fb_copyarea = sys_copyarea,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) .fb_imageblit = sys_imageblit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) .fb_mmap = ht16k33_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * This gets the keys from keypad and reports it to input subsystem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * Returns true if a key is pressed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static bool ht16k33_keypad_scan(struct ht16k33_keypad *keypad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) const unsigned short *keycodes = keypad->dev->keycode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) u16 new_state[HT16K33_MATRIX_KEYPAD_MAX_COLS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) __le16 data[HT16K33_MATRIX_KEYPAD_MAX_COLS];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) unsigned long bits_changed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) int row, col, code;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) bool pressed = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) rc = i2c_smbus_read_i2c_block_data(keypad->client, 0x40,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) sizeof(data), (u8 *)data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) if (rc != sizeof(data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) dev_err(&keypad->client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) "Failed to read key data, rc=%d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) for (col = 0; col < keypad->cols; col++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) new_state[col] = le16_to_cpu(data[col]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) if (new_state[col])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) pressed = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) bits_changed = keypad->last_key_state[col] ^ new_state[col];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) for_each_set_bit(row, &bits_changed, BITS_PER_LONG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) code = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) input_event(keypad->dev, EV_MSC, MSC_SCAN, code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) input_report_key(keypad->dev, keycodes[code],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) new_state[col] & BIT(row));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) input_sync(keypad->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) memcpy(keypad->last_key_state, new_state, sizeof(u16) * keypad->cols);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) return pressed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static irqreturn_t ht16k33_keypad_irq_thread(int irq, void *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) struct ht16k33_keypad *keypad = dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) wait_event_timeout(keypad->wait, keypad->stopped,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) msecs_to_jiffies(keypad->debounce_ms));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) if (keypad->stopped)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) } while (ht16k33_keypad_scan(keypad));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) static int ht16k33_keypad_start(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) struct ht16k33_keypad *keypad = input_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) keypad->stopped = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) enable_irq(keypad->client->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static void ht16k33_keypad_stop(struct input_dev *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct ht16k33_keypad *keypad = input_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) keypad->stopped = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) mb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) wake_up(&keypad->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) disable_irq(keypad->client->irq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) static int ht16k33_keypad_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) struct ht16k33_keypad *keypad)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) struct device_node *node = client->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) u32 rows = HT16K33_MATRIX_KEYPAD_MAX_ROWS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) u32 cols = HT16K33_MATRIX_KEYPAD_MAX_COLS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) keypad->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) init_waitqueue_head(&keypad->wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) keypad->dev = devm_input_allocate_device(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) if (!keypad->dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) input_set_drvdata(keypad->dev, keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) keypad->dev->name = DRIVER_NAME"-keypad";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) keypad->dev->id.bustype = BUS_I2C;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) keypad->dev->open = ht16k33_keypad_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) keypad->dev->close = ht16k33_keypad_stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) if (!of_get_property(node, "linux,no-autorepeat", NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) __set_bit(EV_REP, keypad->dev->evbit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) err = of_property_read_u32(node, "debounce-delay-ms",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) &keypad->debounce_ms);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) dev_err(&client->dev, "key debounce delay not specified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) err = matrix_keypad_parse_of_params(&client->dev, &rows, &cols);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) if (rows > HT16K33_MATRIX_KEYPAD_MAX_ROWS ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) cols > HT16K33_MATRIX_KEYPAD_MAX_COLS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) dev_err(&client->dev, "%u rows or %u cols out of range in DT\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) rows, cols);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) return -ERANGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) keypad->rows = rows;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) keypad->cols = cols;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) keypad->row_shift = get_count_order(cols);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) err = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) keypad->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) dev_err(&client->dev, "failed to build keymap\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) err = devm_request_threaded_irq(&client->dev, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) NULL, ht16k33_keypad_irq_thread,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) DRIVER_NAME, keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) dev_err(&client->dev, "irq request failed %d, error %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) client->irq, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) ht16k33_keypad_stop(keypad->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) err = input_register_device(keypad->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) static int ht16k33_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) uint32_t dft_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) struct backlight_device *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) struct backlight_properties bl_props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) struct ht16k33_priv *priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) struct ht16k33_fbdev *fbdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) struct device_node *node = client->dev.of_node;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) dev_err(&client->dev, "i2c_check_functionality error\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) if (client->irq <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) dev_err(&client->dev, "No IRQ specified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) if (!priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) priv->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) i2c_set_clientdata(client, priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) fbdev = &priv->fbdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) err = ht16k33_initialize(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) /* Backlight */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) memset(&bl_props, 0, sizeof(struct backlight_properties));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) bl_props.type = BACKLIGHT_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) bl_props.max_brightness = MAX_BRIGHTNESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) bl = devm_backlight_device_register(&client->dev, DRIVER_NAME"-bl",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) &client->dev, priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) &ht16k33_bl_ops, &bl_props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (IS_ERR(bl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) dev_err(&client->dev, "failed to register backlight\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return PTR_ERR(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) err = of_property_read_u32(node, "default-brightness-level",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) &dft_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) dft_brightness = MAX_BRIGHTNESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) } else if (dft_brightness > MAX_BRIGHTNESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) dev_warn(&client->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) "invalid default brightness level: %u, using %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) dft_brightness, MAX_BRIGHTNESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) dft_brightness = MAX_BRIGHTNESS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) bl->props.brightness = dft_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) ht16k33_bl_update_status(bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) /* Framebuffer (2 bytes per column) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) fbdev->buffer = (unsigned char *) get_zeroed_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) if (!fbdev->buffer)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) fbdev->cache = devm_kmalloc(&client->dev, HT16K33_FB_SIZE, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) if (!fbdev->cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) goto err_fbdev_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) fbdev->info = framebuffer_alloc(0, &client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) if (!fbdev->info) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) goto err_fbdev_buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) err = of_property_read_u32(node, "refresh-rate-hz",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) &fbdev->refresh_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) dev_err(&client->dev, "refresh rate not specified\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) goto err_fbdev_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) fb_bl_default_curve(fbdev->info, 0, MIN_BRIGHTNESS, MAX_BRIGHTNESS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) INIT_DELAYED_WORK(&fbdev->work, ht16k33_fb_update);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) fbdev->info->fbops = &ht16k33_fb_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) fbdev->info->screen_base = (char __iomem *) fbdev->buffer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) fbdev->info->screen_size = HT16K33_FB_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) fbdev->info->fix = ht16k33_fb_fix;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) fbdev->info->var = ht16k33_fb_var;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) fbdev->info->bl_dev = bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) fbdev->info->pseudo_palette = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) fbdev->info->flags = FBINFO_FLAG_DEFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) fbdev->info->par = priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) err = register_framebuffer(fbdev->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) goto err_fbdev_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) err = ht16k33_keypad_probe(client, &priv->keypad);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) goto err_fbdev_unregister;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) ht16k33_fb_queue(priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) err_fbdev_unregister:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) unregister_framebuffer(fbdev->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) err_fbdev_info:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) framebuffer_release(fbdev->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) err_fbdev_buffer:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) free_page((unsigned long) fbdev->buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) static int ht16k33_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) struct ht16k33_priv *priv = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) struct ht16k33_fbdev *fbdev = &priv->fbdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) cancel_delayed_work_sync(&fbdev->work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) unregister_framebuffer(fbdev->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) framebuffer_release(fbdev->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) free_page((unsigned long) fbdev->buffer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) static const struct i2c_device_id ht16k33_i2c_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) { "ht16k33", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) MODULE_DEVICE_TABLE(i2c, ht16k33_i2c_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) static const struct of_device_id ht16k33_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) { .compatible = "holtek,ht16k33", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) MODULE_DEVICE_TABLE(of, ht16k33_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) static struct i2c_driver ht16k33_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) .probe = ht16k33_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) .remove = ht16k33_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) .name = DRIVER_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) .of_match_table = of_match_ptr(ht16k33_of_match),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) .id_table = ht16k33_i2c_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) module_i2c_driver(ht16k33_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) MODULE_DESCRIPTION("Holtek HT16K33 driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) MODULE_AUTHOR("Robin van der Gracht <robin@protonic.nl>");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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