From patchwork Thu Mar 19 14:59:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Jiada" X-Patchwork-Id: 11447331 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4CBDC6CA for ; Thu, 19 Mar 2020 15:01:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2E20D20BED for ; Thu, 19 Mar 2020 15:01:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727957AbgCSPBP (ORCPT ); Thu, 19 Mar 2020 11:01:15 -0400 Received: from esa1.mentor.iphmx.com ([68.232.129.153]:15962 "EHLO esa1.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727930AbgCSPBP (ORCPT ); Thu, 19 Mar 2020 11:01:15 -0400 IronPort-SDR: HAqqYjj4bii24FoB/u31+K9R7FH1NIXOhQHxtgh0jiJmo+f+9pqrgQWOMcM+NXJDTCmPcs/MJ3 tt6KBd4fTIpzYW1o+zwMQpD0S5tP/+cEpo/4Yu//aqvJ8osk71jmqZ/c5w7W5tj2DRQzegW7S/ GifWmkdwQo5LjuNo9xLU7nAQSlgE+CqOnzfvS1nc5U1opgFROkSD3Fgorihoo/JtbFxTrtNj9/ +GEKILtEFiBwW9kds4zof6aJhIVJZlnd+u5HLyAUkCb5sR+NnyOTYGVC5OAzR/wVmTK7TA8oaR 3KU= X-IronPort-AV: E=Sophos;i="5.70,572,1574150400"; d="scan'208";a="48850186" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa1.mentor.iphmx.com with ESMTP; 19 Mar 2020 07:01:13 -0800 IronPort-SDR: AZeIdfsJ4S8gaSQnOJi6c00MRAQ0vvIKNclIlyovIjSoBzSih4MXYMmHjN192U/AxDMN69lmq1 BGqcs7/patg5FjxlsFku09JNa15tYcyaX93YCAzsL97UjPtERNi1VaHndxjuljYqpG+AykRIDh AQM8o5mu3LYHjJkYxWcTAoEI2kjAbg97DkBIg/1x97LzvZVurGTq6ElyGhccSXwbJbA20Kp2qd 9kKiZS5XaZK1oc7jWkLWL0xESH6p+WO34XRiqV1Tjb7f7Gtwosq/o+oUpCwxqhiG+5UGFq+1mq CLg= From: Jiada Wang To: , , , , , CC: , , , , Subject: [PATCH v8 13/52] Input: atmel_mxt_ts - add regulator control support Date: Thu, 19 Mar 2020 07:59:37 -0700 Message-ID: <20200319150016.61398-14-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200319150016.61398-1-jiada_wang@mentor.com> References: <20200319150016.61398-1-jiada_wang@mentor.com> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org From: Nick Dyer 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 Acked-by: Benson Leung Acked-by: Yufeng Shen (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 [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 [jiada: Replace white-spaces with tab for MXT_CHG_DELAY separate Documentation/ and include/dt-bindings/ portion change to another commit] Signed-off-by: Jiada Wang --- drivers/input/touchscreen/atmel_mxt_ts.c | 130 +++++++++++++++++++++-- 1 file changed, 121 insertions(+), 9 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 9aafed92db9c..ef8baf64659e 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -26,10 +26,12 @@ #include #include #include +#include #include #include #include #include +#include /* 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 +3575,8 @@ 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 +3663,18 @@ 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;