489 lines
12 KiB
Diff
489 lines
12 KiB
Diff
From 7da09897a8eb4b19a429d7d05feeb719eba43bdc Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= <megi@xff.cz>
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Date: Sat, 5 Oct 2019 15:12:51 +0200
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Subject: [PATCH 076/389] regulator: tp65185x: Add tp65185x eInk panel
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regulator driver
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This is a very simple driver that doesn't try to expose individual
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regulators, and implements the specific power sequencing necessary
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for the eInk panel power up directly.
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All the 6 regulators are thus represented as one logical supply.
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VCOM output is the only voltage that needs setting, and it can
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be changed by setting the voltage of the regulator exported by
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the driver.
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Signed-off-by: Ondrej Jirman <megi@xff.cz>
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---
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drivers/regulator/Kconfig | 8 +
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drivers/regulator/Makefile | 1 +
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drivers/regulator/tp65185x.c | 428 +++++++++++++++++++++++++++++++++++
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3 files changed, 437 insertions(+)
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create mode 100644 drivers/regulator/tp65185x.c
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diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
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index 8d441b193f4b..023089c03931 100644
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--- a/drivers/regulator/Kconfig
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+++ b/drivers/regulator/Kconfig
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@@ -1533,4 +1533,12 @@ config REGULATOR_QCOM_LABIBB
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boost regulator and IBB can be used as a negative boost regulator
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for LCD display panel.
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+config REGULATOR_TP65185X
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+ tristate "eInk display regulator tp65185x"
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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 provides support for the voltage regulators for
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+ eInk displays on various e-book readers.
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+
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endif
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diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
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index 0ef88e8c8cf5..f1723b36abf4 100644
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--- a/drivers/regulator/Makefile
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+++ b/drivers/regulator/Makefile
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@@ -183,5 +183,6 @@ obj-$(CONFIG_REGULATOR_WM831X) += wm831x-ldo.o
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obj-$(CONFIG_REGULATOR_WM8350) += wm8350-regulator.o
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obj-$(CONFIG_REGULATOR_WM8400) += wm8400-regulator.o
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obj-$(CONFIG_REGULATOR_WM8994) += wm8994-regulator.o
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+obj-$(CONFIG_REGULATOR_TP65185X) += tp65185x.o
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ccflags-$(CONFIG_REGULATOR_DEBUG) += -DDEBUG
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diff --git a/drivers/regulator/tp65185x.c b/drivers/regulator/tp65185x.c
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new file mode 100644
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index 000000000000..8b57a11ff2f9
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--- /dev/null
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+++ b/drivers/regulator/tp65185x.c
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@@ -0,0 +1,428 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+//
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+// Regulator device driver for tp65185x (eInk panel regulator)
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+//
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+// Copyright (C) 2019 Ondřej Jirman <megi@xff.cz>
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+
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+#include <linux/err.h>
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+#include <linux/i2c.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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+#include <linux/regulator/of_regulator.h>
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+#include <linux/gpio/consumer.h>
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+#include <linux/delay.h>
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+
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+#define REG_TMST_VALUE 0x00
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+#define REG_ENABLE 0x01
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+#define REG_VADJ 0x02
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+#define REG_VCOM1 0x03
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+#define REG_VCOM2 0x04
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+#define REG_INT_EN1 0x05
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+#define REG_INT_EN2 0x06
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+#define REG_INT1 0x07
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+#define REG_INT2 0x08
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+#define REG_UPSEQ0 0x09
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+#define REG_UPSEQ1 0x0A
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+#define REG_DWNSEQ0 0x0B
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+#define REG_DWNSEQ1 0x0C
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+#define REG_TMST1 0x0D
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+#define REG_TMST2 0x0E
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+#define REG_PG 0x0F
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+#define REG_REVID 0x10
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+
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+struct tp65185x {
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+ struct device* dev;
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+ struct gpio_desc* wakeup_gpio;
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+ struct gpio_desc* vcom_gpio;
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+ struct gpio_desc* powerup_gpio;
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+ struct gpio_desc* powergood_gpio;
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+ struct regmap *regmap;
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+ bool is_enabled;
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+ int vcom;
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+};
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+
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+static const struct regmap_config tp65185x_regmap_config = {
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+ .reg_bits = 8,
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+ .val_bits = 8,
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+ .max_register = 0x10,
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+ .cache_type = REGCACHE_NONE,
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+};
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+
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+struct voltage_rail {
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+ const char* name;
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+ int bit;
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+ int bit_en;
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+};
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+
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+static const struct voltage_rail rails[] = {
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+ { "VB", 7, -1 },
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+ { "VDDH", 6, 3 },
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+ { "VN", 5, -1 },
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+ { "VPOS", 4, 2 },
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+ { "VEE", 3, 1 },
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+ { "VNEG", 1, 0 },
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+ { "VCOM", -1, 4 },
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+ { "V3P3", -1, 5 },
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+};
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+
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+static int apply_voltage(struct tp65185x *tp, int vcom)
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+{
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+ int ret;
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+
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+ ret = regmap_write(tp->regmap, REG_VCOM1, vcom & 0xff);
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+ if (ret)
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+ return ret;
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+
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+ return regmap_write(tp->regmap, REG_VCOM2, (vcom >> 8) & 1);
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+}
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+
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+static int set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV,
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+ unsigned *selector)
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+{
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+ struct tp65185x* tp = rdev_get_drvdata(rdev);
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+ unsigned int vcom = min_uV / 10000;
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+
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+ if (vcom > 511 || min_uV < 0)
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+ return -EINVAL;
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+
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+ tp->vcom = vcom;
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+
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+ // setup VCOM
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+
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+ if (!tp->is_enabled)
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+ return 0;
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+
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+ return apply_voltage(tp, vcom);
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+}
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+
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+static int get_voltage(struct regulator_dev *rdev)
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+{
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+ struct tp65185x* tp = rdev_get_drvdata(rdev);
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+ unsigned int lsb, msb;
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+ int ret;
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+
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+ if (tp->is_enabled) {
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+ ret = regmap_read(rdev->regmap, REG_VCOM1, &lsb);
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+ if (ret)
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+ return ret;
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+
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+ ret = regmap_read(rdev->regmap, REG_VCOM2, &msb);
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+ if (ret)
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+ return ret;
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+
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+ return (lsb | ((msb & 1) << 8)) * 10000;
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+ }
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+
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+ return tp->vcom * 10000;
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+}
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+
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+#ifdef DEBUG
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+static int show_power_status(struct tp65185x* tp, const char* state)
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+{
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+ unsigned int reg;
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+ int i, ret;
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+
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+ ret = regmap_read(tp->regmap, REG_PG, ®);
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+ if (ret)
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+ return ret;
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+
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+ dev_warn(tp->dev, "%s:\n", state);
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+
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+ dev_warn(tp->dev, " voltage rail power good:\n");
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+ for (i = 0; i < ARRAY_SIZE(rails); i++)
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+ if (rails[i].bit >= 0)
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+ dev_warn(tp->dev, " %s %s\n", rails[i].name,
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+ reg & BIT(rails[i].bit) ? "good" : "fail");
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+
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+ ret = regmap_read(tp->regmap, REG_ENABLE, ®);
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+ if (ret)
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+ return ret;
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+
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+ dev_warn(tp->dev, " voltage rail enable status:\n");
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+ for (i = 0; i < ARRAY_SIZE(rails); i++)
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+ if (rails[i].bit_en >= 0)
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+ dev_warn(tp->dev, " %s %s\n", rails[i].name,
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+ reg & BIT(rails[i].bit_en)
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+ ? "enabled" : "disabled");
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+
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+ return 0;
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+}
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+#else
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+static int show_power_status(struct tp65185x* tp, const char* state)
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+{
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+ return 0;
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+}
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+#endif
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+
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+static int show_power_bad(struct tp65185x* tp)
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+{
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+ unsigned int reg;
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+ int i, ret;
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+
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+ ret = regmap_read(tp->regmap, REG_PG, ®);
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+ if (ret)
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+ return ret;
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+
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+ dev_warn(tp->dev, "Voltage rail failures:\n");
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+ for (i = 0; i < ARRAY_SIZE(rails); i++)
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+ if (rails[i].bit >= 0 && !(reg & BIT(rails[i].bit)))
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+ dev_warn(tp->dev, " %s failed\n", rails[i].name);
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+
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+ return 0;
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+}
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+
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+static int wait_for_power_good(struct tp65185x *tp)
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+{
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+ int ret, loops = 10;
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+
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+ // wait for power good
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+ while (loops-- > 0) {
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+ ret = gpiod_get_value(tp->powergood_gpio);
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+ if (ret < 0)
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+ return ret;
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+
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+ if (ret)
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+ return 0;
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+
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+ msleep(5);
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+ }
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+
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+ show_power_bad(tp);
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+ return -ETIMEDOUT;
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+}
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+
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+static int enable_supply(struct regulator_dev *rdev)
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+{
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+ struct tp65185x* tp = rdev_get_drvdata(rdev);
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+ int ret;
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+
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+ if (tp->is_enabled)
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+ return 0;
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+
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+ // wake up the regulator
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+ gpiod_set_value(tp->wakeup_gpio, 1);
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+ usleep_range(3000, 4000);
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+
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+ ret = apply_voltage(tp, tp->vcom);
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+ if (ret) {
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+ dev_err(tp->dev, "vcom restore failed (%d)\n", ret);
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+ goto err;
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+ }
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+
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+ show_power_status(tp, "pre-powerup");
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+
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+ // enable the VDD on the panel (V3P3) first
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+ ret = regmap_write(tp->regmap, REG_ENABLE, 0x20);
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+ if (ret) {
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+ dev_err(tp->dev, "vdd enable failed (%d)\n", ret);
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+ goto err;
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+ }
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+
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+ usleep_range(2000, 2200);
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+
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+ show_power_status(tp, "V3P3 en");
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+
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+ // powerup by default takes about 20ms
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+ gpiod_set_value(tp->powerup_gpio, 1);
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+ usleep_range(22000, 24000);
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+
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+ ret = wait_for_power_good(tp);
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+ if (ret)
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+ goto err;
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+
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+ show_power_status(tp, "powerup done");
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+
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+ // enable VCOM last
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+ gpiod_set_value(tp->vcom_gpio, 1);
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+ usleep_range(4000, 5000);
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+
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+ show_power_status(tp, "powerup vcom");
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+
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+ tp->is_enabled = true;
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+ return 0;
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+
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+err:
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+ gpiod_set_value(tp->vcom_gpio, 0);
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+ usleep_range(2000, 3000);
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+ gpiod_set_value(tp->powerup_gpio, 0);
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+ msleep(100);
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+ gpiod_set_value(tp->wakeup_gpio, 0);
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+ return ret;
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+}
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+
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+static int disable_supply(struct regulator_dev *rdev)
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+{
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+ struct tp65185x* tp = rdev_get_drvdata(rdev);
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+
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+ if (!tp->is_enabled)
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+ return 0;
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+
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+ show_power_status(tp, "pre-poweroff");
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+
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+ gpiod_set_value(tp->vcom_gpio, 0);
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+ usleep_range(5000, 6000);
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+
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+ show_power_status(tp, "vcom down");
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+
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+ gpiod_set_value(tp->powerup_gpio, 0);
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+
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+ // it may take up to 100ms to power off all high voltage rails
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+ msleep(100);
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+
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+ show_power_status(tp, "power down");
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+
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+ // this will power down the V3P3 switch too
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+ gpiod_set_value(tp->wakeup_gpio, 0);
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+
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+ tp->is_enabled = false;
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+
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+ return 0;
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+}
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+
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+static int is_supply_enabled(struct regulator_dev *rdev)
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+{
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+ struct tp65185x* tp = rdev_get_drvdata(rdev);
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+ //int ret;
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+
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+ //ret = gpiod_get_value(tp->powergood_gpio);
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+ //if (ret < 0)
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+ //return ret;
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+
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+ return tp->is_enabled;
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+}
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+
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+static const struct regulator_ops tp65185x_ops = {
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+ .is_enabled = is_supply_enabled,
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+ .enable = enable_supply,
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+ .disable = disable_supply,
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+ .set_voltage = set_voltage,
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+ .get_voltage = get_voltage,
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+};
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+
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+static const struct regulator_desc tp65185x_reg = {
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+ .name = "tp65185x",
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+ .id = 0,
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+ .continuous_voltage_range = 1,
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+ .ops = &tp65185x_ops,
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+ .type = REGULATOR_VOLTAGE,
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+ .owner = THIS_MODULE,
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+};
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+
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+static int tp65185x_i2c_probe(struct i2c_client *i2c,
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+ const struct i2c_device_id *id)
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+{
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+ struct device *dev = &i2c->dev;
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+ struct regulator_dev *rdev;
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+ struct regulator_config config = { };
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+ unsigned int reg;
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+ struct tp65185x* tp;
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+ const char* rev = NULL;
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+ int ret;
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+
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+ tp = devm_kzalloc(dev, sizeof(*tp), GFP_KERNEL);
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+ if (!tp)
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+ return -ENOMEM;
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+
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+ tp->dev = dev;
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+
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+ tp->powergood_gpio = devm_gpiod_get(dev, "powergood", GPIOD_IN);
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+ if (IS_ERR(tp->powergood_gpio)) {
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+ ret = PTR_ERR(tp->powergood_gpio);
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+ dev_err(dev, "Can't get wakeup gpio (%d)\n", ret);
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+ return ret;
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+ }
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+
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+ tp->powerup_gpio = devm_gpiod_get(dev, "powerup", GPIOD_OUT_LOW);
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+ if (IS_ERR(tp->powerup_gpio)) {
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+ ret = PTR_ERR(tp->powerup_gpio);
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+ dev_err(dev, "Can't get wakeup gpio (%d)\n", ret);
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+ return ret;
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+ }
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+
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+ tp->vcom_gpio = devm_gpiod_get(dev, "vcom", GPIOD_OUT_LOW);
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+ if (IS_ERR(tp->vcom_gpio)) {
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+ ret = PTR_ERR(tp->vcom_gpio);
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+ dev_err(dev, "Can't get wakeup gpio (%d)\n", ret);
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+ return ret;
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+ }
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+
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+ tp->wakeup_gpio = devm_gpiod_get(dev, "wakeup", GPIOD_OUT_HIGH);
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+ if (IS_ERR(tp->wakeup_gpio)) {
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+ ret = PTR_ERR(tp->wakeup_gpio);
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+ dev_err(dev, "Can't get wakeup gpio (%d)\n", ret);
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+ return ret;
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+ }
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+
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+ // wait for wakeup
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+ usleep_range(10000, 12000);
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+
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+ i2c_set_clientdata(i2c, tp);
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+
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+ tp->regmap = devm_regmap_init_i2c(i2c, &tp65185x_regmap_config);
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+ if (IS_ERR(tp->regmap)) {
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+ ret = PTR_ERR(tp->regmap);
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+ dev_err(dev, "Failed to allocate register map: %d\n", ret);
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+ return ret;
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+ }
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+
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+ ret = regmap_read(tp->regmap, REG_REVID, ®);
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+ if (ret) {
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+ dev_err(dev, "chip id read failed (%d)\n", ret);
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+ return ret;
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+ }
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+
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+ switch (reg) {
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+ case 0x45: rev = "TPS65185 1p0"; break;
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+ case 0x55: rev = "TPS65185 1p1"; break;
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+ case 0x65: rev = "TPS65185 1p2"; break;
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+ case 0x66: rev = "TPS651851 1p0"; break;
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+ default:
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+ dev_err(dev, "reading chip id\n");
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+ break;
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+
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+ }
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+
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+ dev_info(dev, "detected chip id 0x%02x (%s)\n", (int)reg, rev);
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+
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+ // disable regulators, move to sleep
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+ gpiod_set_value(tp->wakeup_gpio, 0);
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+
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+ config.driver_data = tp;
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+ config.dev = &i2c->dev;
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+ config.regmap = tp->regmap;
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+ config.of_node = dev->of_node;
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+ config.init_data = of_get_regulator_init_data(dev, dev->of_node,
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+ &tp65185x_reg);
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+ if (!config.init_data)
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+ return -ENOMEM;
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+
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+ rdev = devm_regulator_register(&i2c->dev, &tp65185x_reg, &config);
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+ if (IS_ERR(rdev)) {
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+ ret = PTR_ERR(rdev);
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+ dev_err(&i2c->dev, "Failed to register egulator (%d)\n", ret);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+static const struct i2c_device_id tp65185x_i2c_id[] = {
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+ { "tp65185x", 0 },
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+ { },
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+};
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+MODULE_DEVICE_TABLE(i2c, tp65185x_i2c_id);
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+
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+static struct i2c_driver tp65185x_regulator_driver = {
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+ .driver = {
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+ .name = "tp65185x",
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+ },
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+ .probe = tp65185x_i2c_probe,
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+ .id_table = tp65185x_i2c_id,
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+};
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+
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+module_i2c_driver(tp65185x_regulator_driver);
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+
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+MODULE_AUTHOR("Ondřej Jirman <megi@xff.cz>");
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+MODULE_DESCRIPTION("Regulator device driver for tp65185x");
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+MODULE_LICENSE("GPL");
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--
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2.35.3
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|