mirror of
https://git.openwrt.org/openwrt/openwrt.git
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8c405cdccc
The patches were generated from the RPi repo with the following command: git format-patch v6.6.34..rpi-6.1.y Some patches needed rebasing and, as usual, the applied and reverted, wireless drivers, Github workflows, READMEs and defconfigs patches were removed. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
239 lines
6.5 KiB
Diff
239 lines
6.5 KiB
Diff
From e47bee270ad0ac0d32af91acfc5d8a84c4039787 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Mon, 30 Nov 2020 16:45:23 +0000
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Subject: [PATCH 0944/1085] regulator: Add a regulator for the new LCD panels
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The newer Raspberry Pi 5" and 7" panels have a slightly different
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register map to the original one.
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Add a new driver for this regulator.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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drivers/regulator/Kconfig | 10 ++
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drivers/regulator/Makefile | 1 +
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drivers/regulator/rpi-panel-v2-regulator.c | 189 +++++++++++++++++++++
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3 files changed, 200 insertions(+)
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create mode 100644 drivers/regulator/rpi-panel-v2-regulator.c
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--- a/drivers/regulator/Kconfig
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+++ b/drivers/regulator/Kconfig
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@@ -1097,6 +1097,16 @@ config REGULATOR_RASPBERRYPI_TOUCHSCREEN
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touchscreen unit. The regulator is used to enable power to the
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TC358762, display and to control backlight.
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+config REGULATOR_RASPBERRYPI_TOUCHSCREEN_V2
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+ tristate "Raspberry Pi 7-inch touchscreen panel V2 regulator"
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+ depends on BACKLIGHT_CLASS_DEVICE
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+ depends on I2C
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+ select REGMAP_I2C
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+ help
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+ This driver supports regulator on the V2 Raspberry Pi
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+ touchscreen unit. The regulator is used to enable power to the
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+ display and to control backlight.
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+
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config REGULATOR_RC5T583
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tristate "RICOH RC5T583 Power regulators"
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depends on MFD_RC5T583
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--- a/drivers/regulator/Makefile
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+++ b/drivers/regulator/Makefile
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@@ -130,6 +130,7 @@ obj-$(CONFIG_REGULATOR_PCAP) += pcap-reg
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obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
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obj-$(CONFIG_REGULATOR_RAA215300) += raa215300.o
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obj-$(CONFIG_REGULATOR_RASPBERRYPI_TOUCHSCREEN_ATTINY) += rpi-panel-attiny-regulator.o
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+obj-$(CONFIG_REGULATOR_RASPBERRYPI_TOUCHSCREEN_V2) += rpi-panel-v2-regulator.o
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obj-$(CONFIG_REGULATOR_RC5T583) += rc5t583-regulator.o
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obj-$(CONFIG_REGULATOR_RK808) += rk808-regulator.o
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obj-$(CONFIG_REGULATOR_RN5T618) += rn5t618-regulator.o
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--- /dev/null
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+++ b/drivers/regulator/rpi-panel-v2-regulator.c
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@@ -0,0 +1,189 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Copyright (C) 2022 Raspberry Pi Ltd.
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+ *
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+ * Based on rpi-panel-attiny-regulator.c by Marek Vasut <marex@denx.de>
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+ */
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+
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+#include <linux/backlight.h>
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+#include <linux/err.h>
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+#include <linux/gpio.h>
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+#include <linux/gpio/driver.h>
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+#include <linux/module.h>
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+#include <linux/regmap.h>
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+#include <linux/regulator/driver.h>
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+
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+/* I2C registers of the microcontroller. */
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+#define REG_ID 0x01
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+#define REG_POWERON 0x02
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+#define REG_PWM 0x03
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+
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+// bits for poweron register
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+#define LCD_RESET_BIT BIT(0)
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+#define CTP_RESET_BIT BIT(1)
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+
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+//bits for the PWM register
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+#define PWM_BL_ENABLE BIT(7)
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+#define PWM_VALUE GENMASK(4, 0)
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+
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+#define NUM_GPIO 2 /* Treat LCD_RESET and CTP_RESET as GPIOs */
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+
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+struct rpi_panel_v2_lcd {
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+ /* lock to serialise overall accesses to the Atmel */
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+ struct mutex lock;
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+ struct regmap *regmap;
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+ u8 poweron_state;
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+
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+ struct gpio_chip gc;
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+};
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+
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+static const struct regmap_config rpi_panel_regmap_config = {
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+ .reg_bits = 8,
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+ .val_bits = 8,
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+ .max_register = REG_PWM,
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+};
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+
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+static int rpi_panel_v2_gpio_get_direction(struct gpio_chip *gc, unsigned int off)
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+{
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+ return GPIO_LINE_DIRECTION_OUT;
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+}
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+
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+static void rpi_panel_v2_gpio_set(struct gpio_chip *gc, unsigned int off, int val)
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+{
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+ struct rpi_panel_v2_lcd *state = gpiochip_get_data(gc);
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+ u8 last_val;
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+
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+ if (off >= NUM_GPIO)
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+ return;
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+
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+ mutex_lock(&state->lock);
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+
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+ last_val = state->poweron_state;
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+ if (val)
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+ last_val |= (1 << off);
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+ else
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+ last_val &= ~(1 << off);
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+
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+ state->poweron_state = last_val;
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+
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+ regmap_write(state->regmap, REG_POWERON, last_val);
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+
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+ mutex_unlock(&state->lock);
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+}
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+
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+static int rpi_panel_v2_update_status(struct backlight_device *bl)
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+{
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+ struct regmap *regmap = bl_get_data(bl);
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+ int brightness = bl->props.brightness;
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+
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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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+ brightness = 0;
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+
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+ return regmap_write(regmap, REG_PWM, brightness | PWM_BL_ENABLE);
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+}
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+
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+static const struct backlight_ops rpi_panel_v2_bl = {
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+ .update_status = rpi_panel_v2_update_status,
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+};
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+
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+/*
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+ * I2C driver interface functions
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+ */
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+static int rpi_panel_v2_i2c_probe(struct i2c_client *i2c)
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+{
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+ struct backlight_properties props = { };
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+ struct backlight_device *bl;
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+ struct rpi_panel_v2_lcd *state;
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+ struct regmap *regmap;
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+ unsigned int data;
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+ int ret;
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+
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+ state = devm_kzalloc(&i2c->dev, sizeof(*state), GFP_KERNEL);
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+ if (!state)
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+ return -ENOMEM;
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+
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+ mutex_init(&state->lock);
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+
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+ regmap = devm_regmap_init_i2c(i2c, &rpi_panel_regmap_config);
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+ if (IS_ERR(regmap)) {
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+ ret = PTR_ERR(regmap);
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+ dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
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+ ret);
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+ goto error;
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+ }
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+
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+ ret = regmap_read(regmap, REG_ID, &data);
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+ if (ret < 0) {
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+ dev_err(&i2c->dev, "Failed to read REG_ID reg: %d\n", ret);
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+ goto error;
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+ }
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+
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+ switch (data & 0x0f) {
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+ case 0x01: /* 7 inch */
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+ case 0x04: /* 7 inch - old */
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+ case 0x08: /* 5 inch - old */
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+ case 0x09: /* 5 inch */
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+ break;
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+ default:
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+ dev_err(&i2c->dev, "Unknown revision: 0x%02x\n",
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+ data & 0x0f);
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+ ret = -ENODEV;
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+ goto error;
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+ }
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+
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+ regmap_write(regmap, REG_POWERON, 0);
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+
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+ state->regmap = regmap;
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+ state->gc.parent = &i2c->dev;
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+ state->gc.label = i2c->name;
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+ state->gc.owner = THIS_MODULE;
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+ state->gc.base = -1;
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+ state->gc.ngpio = NUM_GPIO;
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+
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+ state->gc.set = rpi_panel_v2_gpio_set;
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+ state->gc.get_direction = rpi_panel_v2_gpio_get_direction;
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+ state->gc.can_sleep = true;
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+
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+ ret = devm_gpiochip_add_data(&i2c->dev, &state->gc, state);
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+ if (ret) {
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+ dev_err(&i2c->dev, "Failed to create gpiochip: %d\n", ret);
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+ goto error;
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+ }
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+
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+ props.type = BACKLIGHT_RAW;
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+ props.max_brightness = PWM_VALUE;
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+ bl = devm_backlight_device_register(&i2c->dev, dev_name(&i2c->dev),
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+ &i2c->dev, regmap, &rpi_panel_v2_bl,
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+ &props);
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+ if (IS_ERR(bl))
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+ return PTR_ERR(bl);
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+
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+ bl->props.brightness = PWM_VALUE;
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+
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+ return 0;
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+
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+error:
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+ mutex_destroy(&state->lock);
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+ return ret;
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+}
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+
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+static const struct of_device_id rpi_panel_v2_dt_ids[] = {
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+ { .compatible = "raspberrypi,v2-touchscreen-panel-regulator" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, rpi_panel_v2_dt_ids);
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+
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+static struct i2c_driver rpi_panel_v2_regulator_driver = {
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+ .driver = {
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+ .name = "rpi_touchscreen_v2",
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+ .of_match_table = of_match_ptr(rpi_panel_v2_dt_ids),
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+ },
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+ .probe = rpi_panel_v2_i2c_probe,
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+};
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+
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+module_i2c_driver(rpi_panel_v2_regulator_driver);
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+
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+MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
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+MODULE_DESCRIPTION("Regulator device driver for Raspberry Pi 7-inch V2 touchscreen");
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+MODULE_LICENSE("GPL");
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