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From: Jiada Wang <jiada_wang@mentor.com>
To: <jikos@kernel.org>, <benjamin.tissoires@redhat.com>,
	<rydberg@bitmath.org>, <dmitry.torokhov@gmail.com>,
	<nick@shmanahar.org>, <bsz@semihalf.com>
Cc: <linux-input@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<erosca@de.adit-jv.com>, <Andrew_Gabbasov@mentor.com>,
	<jiada_wang@mentor.com>
Subject: [PATCH v7 13/48] Input: atmel_mxt_ts - add regulator control support
Date: Wed, 12 Feb 2020 00:41:43 -0800
Message-ID: <20200212084218.32344-14-jiada_wang@mentor.com> (raw)
In-Reply-To: <20200212084218.32344-1-jiada_wang@mentor.com>

From: Nick Dyer <nick.dyer@itdev.co.uk>

Allow the driver to optionally manage enabling/disable power to the touch
controller itself. If the regulators are not present then use the deep
sleep power mode instead.

For a correct power on sequence, it is required that we have control over
the RESET line.

Signed-off-by: Nick Dyer <nick.dyer@itdev.co.uk>
Acked-by: Benson Leung <bleung@chromium.org>
Acked-by: Yufeng Shen <miletus@chromium.org>
(cherry picked from ndyer/linux/for-upstream commit 14052b61bb66c2f2283c00e733e131be7a9b8bfc)
[gdavis: Resolve forward port conflicts due to v4.14-rc1 commmit
	 f657b00df22e ("Input: atmel_mxt_ts - add support for reset
	 line") and applying upstream commit 96a938aa214e ("Input:
	 atmel_mxt_ts - remove platform data support").]
Signed-off-by: George G. Davis <george_davis@mentor.com>
[gdavis: Squash fixes from Dirk Behme:
	 - Input: atmel_mxt_ts - in failure case disable the regulator
	 - Input: atmel_mxt_ts - disable only enabled regulators
	 - Input: atmel_mxt_ts - use devm_regulator_get()]
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
---
 .../bindings/input/atmel,maxtouch.txt         |   6 +
 MAINTAINERS                                   |   1 +
 drivers/input/touchscreen/atmel_mxt_ts.c      | 129 ++++++++++++++++--
 include/dt-bindings/input/atmel_mxt_ts.h      |  22 +++
 4 files changed, 149 insertions(+), 9 deletions(-)
 create mode 100644 include/dt-bindings/input/atmel_mxt_ts.h

diff --git a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
index c88919480d37..e28139ce3cae 100644
--- a/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
+++ b/Documentation/devicetree/bindings/input/atmel,maxtouch.txt
@@ -31,6 +31,12 @@ Optional properties for main touchpad device:
 
 - reset-gpios: GPIO specifier for the touchscreen's reset pin (active low)
 
+- atmel,suspend-mode: Select method used to suspend:
+    MXT_SUSPEND_DEEP_SLEEP - use T7 to suspend the device into deep sleep
+    MXT_SUSPEND_T9_CTRL - use T9.CTRL to turn off touch processing
+    MXT_SUSPEND_REGULATOR - use regulators to power down device during suspend
+    Definitions are in <dt-bindings/input/atmel_mxt_ts.h>.
+
 Example:
 
 	touch@4b {
diff --git a/MAINTAINERS b/MAINTAINERS
index e48ab79879ac..350ae664e6f0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2873,6 +2873,7 @@ T:	git git://github.com/ndyer/linux.git
 S:	Maintained
 F:	Documentation/devicetree/bindings/input/atmel,maxtouch.txt
 F:	drivers/input/touchscreen/atmel_mxt_ts.c
+F:	include/dt-bindings/input/atmel_mxt_ts.h
 
 ATMEL WIRELESS DRIVER
 M:	Simon Kelley <simon@thekelleys.org.uk>
diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index 2bc34c14dbbf..7b2c62d46ef8 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -26,10 +26,12 @@
 #include <linux/slab.h>
 #include <linux/gpio/consumer.h>
 #include <asm/unaligned.h>
+#include <linux/regulator/consumer.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ioctl.h>
 #include <media/videobuf2-v4l2.h>
 #include <media/videobuf2-vmalloc.h>
+#include <dt-bindings/input/atmel_mxt_ts.h>
 
 /* Firmware files */
 #define MXT_FW_NAME		"maxtouch.fw"
@@ -215,6 +217,9 @@ enum t100_type {
 #define MXT_CRC_TIMEOUT		1000	/* msec */
 #define MXT_FW_RESET_TIME	3000	/* msec */
 #define MXT_FW_CHG_TIMEOUT	300	/* msec */
+#define MXT_REGULATOR_DELAY	150	/* msec */
+#define MXT_CHG_DELAY	        100	/* msec */
+#define MXT_POWERON_DELAY	150	/* msec */
 
 /* Command to unlock bootloader */
 #define MXT_UNLOCK_CMD_MSB	0xaa
@@ -275,11 +280,6 @@ enum v4l_dbg_inputs {
 	MXT_V4L_INPUT_MAX,
 };
 
-enum mxt_suspend_mode {
-	MXT_SUSPEND_DEEP_SLEEP	= 0,
-	MXT_SUSPEND_T9_CTRL	= 1,
-};
-
 /* Config update context */
 struct mxt_cfg {
 	u8 *raw;
@@ -333,6 +333,8 @@ struct mxt_data {
 	u8 stylus_aux_pressure;
 	u8 stylus_aux_peak;
 	bool use_retrigen_workaround;
+	struct regulator *reg_vdd;
+	struct regulator *reg_avdd;
 
 	/* Cached parameters from object table */
 	u16 T5_address;
@@ -2073,6 +2075,94 @@ static int mxt_read_info_block(struct mxt_data *data)
 	return error;
 }
 
+static void mxt_regulator_enable(struct mxt_data *data)
+{
+	int error;
+
+	if (!data->reg_vdd || !data->reg_avdd)
+		return;
+
+	gpiod_set_value(data->reset_gpio, 0);
+
+	error = regulator_enable(data->reg_vdd);
+	if (error)
+		return;
+
+	error = regulator_enable(data->reg_avdd);
+	if (error) {
+		regulator_disable(data->reg_vdd);
+		return;
+	}
+
+	/*
+	 * According to maXTouch power sequencing specification, RESET line
+	 * must be kept low until some time after regulators come up to
+	 * voltage
+	 */
+	msleep(MXT_REGULATOR_DELAY);
+	gpiod_set_value(data->reset_gpio, 1);
+	msleep(MXT_CHG_DELAY);
+
+retry_wait:
+	reinit_completion(&data->bl_completion);
+	data->in_bootloader = true;
+	error = mxt_wait_for_completion(data, &data->bl_completion,
+					MXT_POWERON_DELAY);
+	if (error == -EINTR)
+		goto retry_wait;
+
+	data->in_bootloader = false;
+}
+
+static void mxt_regulator_disable(struct mxt_data *data)
+{
+	if (!data->reg_vdd || !data->reg_avdd)
+		return;
+
+	if (regulator_is_enabled(data->reg_vdd))
+		regulator_disable(data->reg_vdd);
+	if (regulator_is_enabled(data->reg_avdd))
+		regulator_disable(data->reg_avdd);
+}
+
+static int mxt_probe_regulators(struct mxt_data *data)
+{
+	struct device *dev = &data->client->dev;
+	int error;
+
+	/* Must have reset GPIO to use regulator support */
+	if (!data->reset_gpio) {
+		error = -EINVAL;
+		goto fail;
+	}
+
+	data->reg_vdd = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(data->reg_vdd)) {
+		error = PTR_ERR(data->reg_vdd);
+		dev_err(dev, "Error %d getting vdd regulator\n", error);
+		goto fail;
+	}
+
+	data->reg_avdd = devm_regulator_get(dev, "avdd");
+	if (IS_ERR(data->reg_avdd)) {
+		error = PTR_ERR(data->reg_avdd);
+		dev_err(dev, "Error %d getting avdd regulator\n", error);
+		goto fail_release;
+	}
+
+	mxt_regulator_enable(data);
+
+	dev_dbg(dev, "Initialised regulators\n");
+	return 0;
+
+fail_release:
+	regulator_put(data->reg_vdd);
+fail:
+	data->reg_vdd = NULL;
+	data->reg_avdd = NULL;
+	return error;
+}
+
 static int mxt_read_t9_resolution(struct mxt_data *data)
 {
 	struct i2c_client *client = data->client;
@@ -3139,7 +3229,12 @@ static int mxt_load_fw(struct device *dev, const char *fn)
 		goto release_firmware;
 
 	if (data->suspended) {
-		enable_irq(data->irq);
+		if (data->suspend_mode == MXT_SUSPEND_REGULATOR)
+			mxt_regulator_enable(data);
+
+		if (data->suspend_mode == MXT_SUSPEND_DEEP_SLEEP)
+			enable_irq(data->irq);
+
 		data->suspended = false;
 	}
 
@@ -3345,6 +3440,11 @@ static void mxt_start(struct mxt_data *data)
 				MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0x83);
 		break;
 
+	case MXT_SUSPEND_REGULATOR:
+		enable_irq(data->irq);
+		mxt_regulator_enable(data);
+		break;
+
 	case MXT_SUSPEND_DEEP_SLEEP:
 	default:
 		/*
@@ -3377,6 +3477,12 @@ static void mxt_stop(struct mxt_data *data)
 				MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0);
 		break;
 
+	case MXT_SUSPEND_REGULATOR:
+		disable_irq(data->irq);
+		mxt_regulator_disable(data);
+		mxt_reset_slots(data);
+		break;
+
 	case MXT_SUSPEND_DEEP_SLEEP:
 	default:
 		disable_irq(data->irq);
@@ -3469,6 +3575,7 @@ static int mxt_parse_device_properties(struct mxt_data *data)
 		data->t15_num_keys = n_keys;
 	}
 
+	device_property_read_u32(dev, "atmel,suspend-mode", &data->suspend_mode);
 	return 0;
 }
 
@@ -3555,14 +3662,18 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id)
 		return error;
 	}
 
-	disable_irq(client->irq);
-
-	if (data->reset_gpio) {
+	if (data->suspend_mode == MXT_SUSPEND_REGULATOR) {
+		error = mxt_probe_regulators(data);
+		if (error)
+			return error;
+	} else if (data->reset_gpio) {
 		msleep(MXT_RESET_GPIO_TIME);
 		gpiod_set_value(data->reset_gpio, 1);
 		msleep(MXT_RESET_INVALID_CHG);
 	}
 
+	disable_irq(data->irq);
+
 	error = mxt_initialize(data);
 	if (error)
 		return error;
diff --git a/include/dt-bindings/input/atmel_mxt_ts.h b/include/dt-bindings/input/atmel_mxt_ts.h
new file mode 100644
index 000000000000..e4c4c0f6fa37
--- /dev/null
+++ b/include/dt-bindings/input/atmel_mxt_ts.h
@@ -0,0 +1,22 @@
+/*
+ * Atmel maXTouch Touchscreen driver
+ *
+ * Copyright (C) 2015 Atmel Corporation
+ * Author: Nick Dyer <nick.dyer@itdev.co.uk>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#ifndef __DT_BINDINGS_ATMEL_MXT_TS_H
+#define __DT_BINDINGS_ATMEL_MXT_TS_H
+
+enum mxt_suspend_mode {
+	MXT_SUSPEND_DEEP_SLEEP = 0,
+	MXT_SUSPEND_T9_CTRL = 1,
+	MXT_SUSPEND_REGULATOR = 2,
+};
+
+#endif /* __DT_BINDINGS_ATMEL_MXT_TS_H */
-- 
2.17.1


  parent reply index

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-12  8:41 [PATCH v7 00/48] atmel_mxt_ts misc Jiada Wang
2020-02-12  8:41 ` [PATCH v7 01/48] Input: introduce input_mt_report_slot_inactive Jiada Wang
2020-02-12  8:41 ` [PATCH v7 02/48] Input: atmel_mxt_ts - rework sysfs init/remove Jiada Wang
2020-02-12  8:41 ` [PATCH v7 03/48] Input: atmel_mxt_ts - only read messages in mxt_acquire_irq() when necessary Jiada Wang
2020-03-17 22:44   ` Dmitry Osipenko
2020-03-18 13:02     ` Wang, Jiada
2020-02-12  8:41 ` [PATCH v7 04/48] Input: atmel_mxt_ts - split large i2c transfers into blocks Jiada Wang
2020-02-12  8:41 ` [PATCH v7 05/48] Input: atmel_mxt_ts - output status from T48 Noise Supression Jiada Wang
2020-02-12  8:41 ` [PATCH v7 06/48] Input: atmel_mxt_ts - output status from T42 Touch Suppression Jiada Wang
2020-02-12  8:41 ` [PATCH v7 07/48] Input: atmel_mxt_ts - implement T9 vector/orientation support Jiada Wang
2020-02-12  8:41 ` [PATCH v7 08/48] Input: atmel_mxt_ts - implement T15 Key Array support Jiada Wang
2020-02-12  8:41 ` [PATCH v7 09/48] Input: atmel_mxt_ts - handle reports from T47 Stylus object Jiada Wang
2020-02-12  8:41 ` [PATCH v7 10/48] Input: atmel_mxt_ts - implement support for T107 active stylus Jiada Wang
2020-02-12  8:41 ` [PATCH v7 11/48] Input: atmel_mxt_ts - add debug for T92 gesture and T93 touch seq msgs Jiada Wang
2020-02-12  8:41 ` [PATCH v7 12/48] Input: atmel_mxt_ts - release touch state during suspend Jiada Wang
2020-02-12  8:41 ` Jiada Wang [this message]
2020-03-12 15:26   ` [PATCH v7 13/48] Input: atmel_mxt_ts - add regulator control support Dmitry Osipenko
2020-02-12  8:41 ` [PATCH v7 14/48] Input: atmel_mxt_ts - report failures in suspend/resume Jiada Wang
2020-02-12  8:41 ` [PATCH v7 15/48] Input: atmel_mxt_ts - allow specification of firmware file name Jiada Wang
2020-02-12  8:41 ` [PATCH v7 16/48] Input: atmel_mxt_ts - handle cfg filename via pdata/sysfs Jiada Wang
2020-02-12  8:41 ` [PATCH v7 17/48] Input: atmel_mxt_ts - allow input name to be specified in platform data Jiada Wang
2020-02-12  8:41 ` [PATCH v7 18/48] Input: atmel_mxt_ts - add config checksum attribute to sysfs Jiada Wang
2020-02-12  8:41 ` [PATCH v7 19/48] Input: atmel_mxt_ts - refactor firmware flash to extract context into struct Jiada Wang
2020-02-12  8:41 ` [PATCH v7 20/48] Input: atmel_mxt_ts - refactor code to enter bootloader into separate func Jiada Wang
2020-02-12  8:41 ` [PATCH v7 21/48] Input: atmel_mxt_ts - combine bootloader version query with probe Jiada Wang
2020-02-12  8:41 ` [PATCH v7 22/48] Input: atmel_mxt_ts - improve bootloader state machine handling Jiada Wang
2020-03-12 15:28   ` Dmitry Osipenko
2020-02-12  8:41 ` [PATCH v7 23/48] Input: atmel_mxt_ts - rename bl_completion to chg_completion Jiada Wang
2020-02-12  8:41 ` [PATCH v7 24/48] Input: atmel_mxt_ts - make bootloader interrupt driven Jiada Wang
2020-02-12  8:41 ` [PATCH v7 25/48] Input: atmel_mxt_ts - delay enabling IRQ when not using regulators Jiada Wang
2020-02-12  8:41 ` [PATCH v7 26/48] Input: atmel_mxt_ts - implement I2C retries Jiada Wang
2020-02-12  8:41 ` [PATCH v7 27/48] Input: atmel_mxt_ts - orientation is not present in hover Jiada Wang
2020-02-12  8:41 ` [PATCH v7 28/48] Input: atmel_mxt_ts - implement debug output for messages Jiada Wang
2020-02-12  8:41 ` [PATCH v7 29/48] Input: atmel_mxt_ts - implement improved debug message interface Jiada Wang
2020-02-12  8:42 ` [PATCH v7 30/48] Input: atmel_mxt_ts - eliminate data->raw_info_block Jiada Wang
2020-02-12  8:42 ` [PATCH v7 31/48] Input: atmel_mxt_ts - Change call-points of mxt_free_* functions Jiada Wang
2020-02-12  8:42 ` [PATCH v7 32/48] Input: atmel_mxt_ts - rely on calculated_crc rather than file config_crc Jiada Wang
2020-02-12  8:42 ` [PATCH v7 33/48] input: atmel_mxt_ts: export GPIO reset line via sysfs Jiada Wang
2020-02-12  8:42 ` [PATCH v7 34/48] input: atmel_mxt_ts: Add Missing Delay for reset handling of Atmel touch panel controller in detachable displays Jiada Wang
2020-02-12  8:42 ` [PATCH v7 35/48] Input: atmel_mxt_ts: Add support for run self-test routine Jiada Wang
2020-02-12  8:42 ` [PATCH v7 36/48] Input: atmel_mxt_ts: Limit the max bytes transferred in an i2c transaction Jiada Wang
2020-02-12  8:42 ` [PATCH v7 37/48] Input: atmel_mxt_ts: return error from mxt_process_messages_until_invalid() Jiada Wang
2020-02-12  8:42 ` [PATCH v7 38/48] Input: Atmel: improve error handling in mxt_start() Jiada Wang
2020-02-12  8:42 ` [PATCH v7 39/48] Input: Atmel: improve error handling in mxt_initialize() Jiada Wang
2020-02-12  8:42 ` [PATCH v7 40/48] Input: Atmel: improve error handling in mxt_update_cfg() Jiada Wang
2020-02-12  8:42 ` [PATCH v7 41/48] Input: Atmel: Improve error handling in mxt_initialize_input_device() Jiada Wang
2020-02-12  8:42 ` [PATCH v7 42/48] Input: Atmel: handle ReportID "0x00" while processing T5 messages Jiada Wang
2020-02-12  8:42 ` [PATCH v7 43/48] Input: Atmel: use T44 object to process " Jiada Wang
2020-02-12  8:42 ` [PATCH v7 44/48] Input: atmel_mxt_ts: use gpiod_set_value_cansleep for reset pin Jiada Wang
2020-02-12  8:42 ` [PATCH v7 45/48] input: touchscreen: atmel_mxt_ts: Added sysfs entry for touchscreen status Jiada Wang
2020-02-12  8:42 ` [PATCH v7 46/48] input: atmel_mxt_ts: added sysfs interface to update atmel T38 data Jiada Wang
2020-02-12  8:42 ` [PATCH v7 47/48] Input: atmel_mxt_ts: Implement synchronization during various operation Jiada Wang
2020-02-12  8:42 ` [PATCH v7 48/48] Input: atmel_mxt_ts - Fix compilation warning Jiada Wang
2020-03-11  1:09 ` [PATCH v7 00/48] atmel_mxt_ts misc Wang, Jiada
2020-03-12 15:21 ` Dmitry Osipenko
2020-03-16  6:50   ` Wang, Jiada
2020-03-20  3:37   ` Wang, Jiada
2020-03-20 15:53     ` Dmitry Osipenko
2020-03-23  2:25       ` Wang, Jiada
2020-03-24 14:54         ` Dmitry Osipenko
2020-03-24 15:03           ` Dmitry Osipenko
2020-03-25 12:13           ` Wang, Jiada

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