^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * LCD / Backlight control code for Sharp SL-6000x (tosa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2005 Dirk Opfer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2007,2008 Dmitry Baryshkov
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/spi/spi.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/gpio/consumer.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/backlight.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <asm/mach/sharpsl_param.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "tosa_bl.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define COMADJ_DEFAULT 97
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define DAC_CH1 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define DAC_CH2 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct tosa_bl_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct i2c_client *i2c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct backlight_device *bl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) struct gpio_desc *gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) int comadj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static void tosa_bl_set_backlight(struct tosa_bl_data *data, int brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct spi_device *spi = dev_get_platdata(&data->i2c->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) i2c_smbus_write_byte_data(data->i2c, DAC_CH1, data->comadj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /* SetBacklightDuty */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) i2c_smbus_write_byte_data(data->i2c, DAC_CH2, (u8)(brightness & 0xff));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* SetBacklightVR */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) gpiod_set_value(data->gpio, brightness & 0x100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) tosa_bl_enable(spi, brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int tosa_bl_update_status(struct backlight_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct backlight_properties *props = &dev->props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct tosa_bl_data *data = bl_get_data(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) int power = max(props->power, props->fb_blank);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) int brightness = props->brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) if (power)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) brightness = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) tosa_bl_set_backlight(data, brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) static int tosa_bl_get_brightness(struct backlight_device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct backlight_properties *props = &dev->props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return props->brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static const struct backlight_ops bl_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .get_brightness = tosa_bl_get_brightness,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .update_status = tosa_bl_update_status,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) static int tosa_bl_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) struct backlight_properties props;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) struct tosa_bl_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) data = devm_kzalloc(&client->dev, sizeof(struct tosa_bl_data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) data->comadj = sharpsl_param.comadj == -1 ? COMADJ_DEFAULT : sharpsl_param.comadj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) data->gpio = devm_gpiod_get(&client->dev, "backlight", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ret = PTR_ERR_OR_ZERO(data->gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) dev_dbg(&data->bl->dev, "Unable to request gpio!\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) i2c_set_clientdata(client, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) data->i2c = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) memset(&props, 0, sizeof(struct backlight_properties));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) props.type = BACKLIGHT_RAW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) props.max_brightness = 512 - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) data->bl = devm_backlight_device_register(&client->dev, "tosa-bl",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) &client->dev, data, &bl_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) &props);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (IS_ERR(data->bl)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) ret = PTR_ERR(data->bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) goto err_reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) data->bl->props.brightness = 69;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) data->bl->props.power = FB_BLANK_UNBLANK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) backlight_update_status(data->bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) err_reg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) data->bl = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) return ret;
^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) static int tosa_bl_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct tosa_bl_data *data = i2c_get_clientdata(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) data->bl = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) static int tosa_bl_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct tosa_bl_data *data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) tosa_bl_set_backlight(data, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) static int tosa_bl_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct tosa_bl_data *data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) backlight_update_status(data->bl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) static SIMPLE_DEV_PM_OPS(tosa_bl_pm_ops, tosa_bl_suspend, tosa_bl_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static const struct i2c_device_id tosa_bl_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) { "tosa-bl", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) { },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) MODULE_DEVICE_TABLE(i2c, tosa_bl_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static struct i2c_driver tosa_bl_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .name = "tosa-bl",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .pm = &tosa_bl_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) .probe = tosa_bl_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) .remove = tosa_bl_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) .id_table = tosa_bl_id,
^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) module_i2c_driver(tosa_bl_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) MODULE_AUTHOR("Dmitry Baryshkov");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) MODULE_LICENSE("GPL v2");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) MODULE_DESCRIPTION("LCD/Backlight control for Sharp SL-6000 PDA");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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