Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753770Ab3F0Mw1 (ORCPT ); Thu, 27 Jun 2013 08:52:27 -0400 Received: from kdh-gw.itdev.co.uk ([89.21.227.133]:40495 "EHLO hermes.kdh.itdev.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753595Ab3F0Muz (ORCPT ); Thu, 27 Jun 2013 08:50:55 -0400 From: Nick Dyer To: Dmitry Torokhov Cc: Daniel Kurtz , Henrik Rydberg , Joonyoung Shim , Alan Bowens , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Meerwald , Benson Leung , Olof Johansson , Nick Dyer Subject: [PATCH 47/51] Input: atmel_mxt_ts - Add regulator control support Date: Thu, 27 Jun 2013 13:49:22 +0100 Message-Id: <1372337366-9286-48-git-send-email-nick.dyer@itdev.co.uk> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1372337366-9286-1-git-send-email-nick.dyer@itdev.co.uk> References: <1372337366-9286-1-git-send-email-nick.dyer@itdev.co.uk> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6020 Lines: 198 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 --- drivers/input/touchscreen/atmel_mxt_ts.c | 95 +++++++++++++++++++++++++++--- include/linux/i2c/atmel_mxt_ts.h | 1 + 2 files changed, 89 insertions(+), 7 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 5ab3861..b75cf38 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -24,6 +24,8 @@ #include #include #include +#include +#include /* Firmware files */ #define MXT_FW_NAME "maxtouch.fw" @@ -152,6 +154,8 @@ struct t9_range { #define MXT_FW_RESET_TIME 3000 /* msec */ #define MXT_FW_CHG_TIMEOUT 300 /* msec */ #define MXT_WAKEUP_TIME 25 /* msec */ +#define MXT_REGULATOR_DELAY 150 /* msec */ +#define MXT_POWERON_DELAY 150 /* msec */ /* Command to unlock bootloader */ #define MXT_UNLOCK_CMD_MSB 0xaa @@ -218,6 +222,9 @@ struct mxt_data { u8 num_stylusids; unsigned long t15_keystatus; bool use_retrigen_workaround; + bool use_regulator; + struct regulator *reg_vdd; + struct regulator *reg_avdd; /* Cached parameters from object table */ u16 T5_address; @@ -1840,6 +1847,66 @@ static int mxt_read_t9_resolution(struct mxt_data *data) return 0; } +static void mxt_regulator_enable(struct mxt_data *data) +{ + gpio_set_value(data->pdata->gpio_reset, 0); + + regulator_enable(data->reg_vdd); + regulator_enable(data->reg_avdd); + msleep(MXT_REGULATOR_DELAY); + + INIT_COMPLETION(data->bl_completion); + gpio_set_value(data->pdata->gpio_reset, 1); + mxt_wait_for_completion(data, &data->bl_completion, MXT_POWERON_DELAY); +} + +static void mxt_regulator_disable(struct mxt_data *data) +{ + regulator_disable(data->reg_vdd); + regulator_disable(data->reg_avdd); +} + +static void mxt_probe_regulators(struct mxt_data *data) +{ + struct device *dev = &data->client->dev; + int error; + + /* According to maXTouch power sequencing specification, RESET line + * must be kept low until some time after regulators come up to + * voltage */ + if (!data->pdata->gpio_reset) { + dev_warn(dev, "Must have reset GPIO to use regulator support\n"); + goto fail; + } + + data->reg_vdd = 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 = regulator_get(dev, "avdd"); + if (IS_ERR(data->reg_vdd)) { + error = PTR_ERR(data->reg_vdd); + dev_err(dev, "Error %d getting avdd regulator\n", error); + goto fail_release; + } + + data->use_regulator = true; + mxt_regulator_enable(data); + + dev_dbg(dev, "Initialised regulators\n"); + return; + +fail_release: + regulator_put(data->reg_vdd); +fail: + data->reg_vdd = NULL; + data->reg_avdd = NULL; + data->use_regulator = false; +} + static int mxt_initialize(struct mxt_data *data) { struct i2c_client *client = data->client; @@ -2034,6 +2101,9 @@ static int mxt_load_fw(struct device *dev, const char *fn) goto release_firmware; if (data->suspended) { + if (data->use_regulator) + mxt_regulator_enable(data); + enable_irq(data->irq); data->suspended = false; } @@ -2198,14 +2268,18 @@ static void mxt_start(struct mxt_data *data) if (!data->suspended || data->in_bootloader) return; - /* Discard any touch messages still in message buffer from before chip - * went to sleep */ - mxt_process_messages_until_invalid(data); + if (data->use_regulator) { + mxt_regulator_enable(data); + } else { + /* Discard any messages still in message buffer from before + * chip went to sleep */ + mxt_process_messages_until_invalid(data); - mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN); + mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN); - /* Recalibrate since chip has been in deep sleep */ - mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false); + /* Recalibrate since chip has been in deep sleep */ + mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false); + } mxt_acquire_irq(data); data->enable_reporting = true; @@ -2220,7 +2294,10 @@ static void mxt_stop(struct mxt_data *data) data->enable_reporting = false; disable_irq(data->irq); - mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP); + if (data->use_regulator) + mxt_regulator_disable(data); + else + mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP); mxt_reset_slots(data); data->suspended = true; @@ -2408,6 +2485,8 @@ static int mxt_probe(struct i2c_client *client, goto err_free_pdata; } + mxt_probe_regulators(data); + disable_irq(data->irq); error = mxt_initialize(data); @@ -2451,6 +2530,8 @@ static int mxt_remove(struct i2c_client *client) sysfs_remove_group(&client->dev.kobj, &mxt_attr_group); free_irq(data->irq, data); input_unregister_device(data->input_dev); + regulator_put(data->reg_avdd); + regulator_put(data->reg_vdd); mxt_free_object_table(data); if (!dev_get_platdata(&data->client->dev)) kfree(data->pdata); diff --git a/include/linux/i2c/atmel_mxt_ts.h b/include/linux/i2c/atmel_mxt_ts.h index b7d2092..a01f2e8 100644 --- a/include/linux/i2c/atmel_mxt_ts.h +++ b/include/linux/i2c/atmel_mxt_ts.h @@ -22,6 +22,7 @@ struct mxt_platform_data { const unsigned int *t19_keymap; int t15_num_keys; const unsigned int *t15_keymap; + unsigned long gpio_reset; }; #endif /* __LINUX_ATMEL_MXT_TS_H */ -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/