Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751691AbdFZW7i (ORCPT ); Mon, 26 Jun 2017 18:59:38 -0400 Received: from bh-25.webhostbox.net ([208.91.199.152]:60104 "EHLO bh-25.webhostbox.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750819AbdFZW7e (ORCPT ); Mon, 26 Jun 2017 18:59:34 -0400 Date: Mon, 26 Jun 2017 15:59:31 -0700 From: Guenter Roeck To: Sebastian Reichel Cc: Sebastian Reichel , Support Opensource , Lee Jones , Rob Herring , Mark Rutland , Jean Delvare , Dmitry Torokhov , devicetree@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 2/2] hwmon: da9052: add support for TSI channel Message-ID: <20170626225931.GB31139@roeck-us.net> References: <20170626144832.32322-1-sebastian.reichel@collabora.co.uk> <20170626144832.32322-3-sebastian.reichel@collabora.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170626144832.32322-3-sebastian.reichel@collabora.co.uk> User-Agent: Mutt/1.5.24 (2015-08-30) X-Authenticated_sender: guenter@roeck-us.net X-OutGoing-Spam-Status: No, score=-1.0 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - bh-25.webhostbox.net X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - roeck-us.net X-Get-Message-Sender-Via: bh-25.webhostbox.net: authenticated_id: guenter@roeck-us.net X-Authenticated-Sender: bh-25.webhostbox.net: guenter@roeck-us.net X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 13041 Lines: 404 On Mon, Jun 26, 2017 at 04:48:32PM +0200, Sebastian Reichel wrote: > TSI channel has a 4 channel mux connected to it and is normally > used for touchscreen support. The hardware may alternatively > use it as general purpose adc. > > Signed-off-by: Sebastian Reichel > --- > .../devicetree/bindings/mfd/da9052-i2c.txt | 8 + > drivers/hwmon/da9052-hwmon.c | 229 ++++++++++++++++++++- > drivers/input/touchscreen/da9052_tsi.c | 5 + > include/linux/mfd/da9052/da9052.h | 6 + > 4 files changed, 244 insertions(+), 4 deletions(-) > > diff --git a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt > index 9554292dc6cb..94f3bb1d9a0a 100644 > --- a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt > +++ b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt > @@ -4,6 +4,14 @@ Required properties: > - compatible : Should be "dlg,da9052", "dlg,da9053-aa", > "dlg,da9053-ab", or "dlg,da9053-bb" > > +Optional properties: > +- diag,tsi-as-adc : Boolean, if set the X+, X-, Y+, Y- touchscreen > + input lines are used as general purpose analogue > + input. > +- diag,tsiref-microvolt: Voltage applied to the TSIREF pin, which is > + used as reference voltage when reading TSI > + pins as ADC. Defaults to 2500000. Wouldn't it be better to handle this using a regulator ? > + > Sub-nodes: > - regulators : Contain the regulator nodes. The DA9052/53 regulators are > bound using their names as listed below: > diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c > index c9832bfacfe5..a0b9d5498ba4 100644 > --- a/drivers/hwmon/da9052-hwmon.c > +++ b/drivers/hwmon/da9052-hwmon.c > @@ -20,13 +20,17 @@ > #include > #include > #include > +#include > > #include > #include > > struct da9052_hwmon { > - struct da9052 *da9052; > - struct mutex hwmon_lock; > + struct da9052 *da9052; > + struct mutex hwmon_lock; > + bool tsi_as_adc; > + int tsiref_mv; > + struct completion tsidone; > }; > > static const char * const input_names[] = { > @@ -37,6 +41,10 @@ static const char * const input_names[] = { > [DA9052_ADC_IN4] = "ADC IN4", > [DA9052_ADC_IN5] = "ADC IN5", > [DA9052_ADC_IN6] = "ADC IN6", > + [DA9052_ADC_TSI_XP] = "ADC TS X+", > + [DA9052_ADC_TSI_YP] = "ADC TS Y+", > + [DA9052_ADC_TSI_XN] = "ADC TS X-", > + [DA9052_ADC_TSI_YN] = "ADC TS Y-", > [DA9052_ADC_TJUNC] = "BATTERY JUNCTION TEMP", > [DA9052_ADC_VBBAT] = "BACK-UP BATTERY VOLTAGE", > }; > @@ -59,6 +67,11 @@ static inline int vbbat_reg_to_mv(int value) > return DIV_ROUND_CLOSEST(value * 5000, 1023); > } > > +static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value) > +{ > + return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023); > +} > + > static inline int da9052_enable_vddout_channel(struct da9052 *da9052) > { > return da9052_reg_update(da9052, DA9052_ADC_CONT_REG, > @@ -154,6 +167,103 @@ static ssize_t da9052_read_misc_channel(struct device *dev, > return sprintf(buf, "%d\n", input_reg_to_mv(ret)); > } > > +static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel) > +{ > + u8 val = BIT(6); /* TSI_MAN */ > + > + switch (channel) { > + case DA9052_ADC_TSI_XP: > + val |= (0 << 4); /* TSI_MUX */ > + break; > + case DA9052_ADC_TSI_YP: > + val |= (1 << 4); /* TSI_MUX */ > + break; > + case DA9052_ADC_TSI_XN: > + val |= (2 << 4); /* TSI_MUX */ > + break; > + case DA9052_ADC_TSI_YN: > + val |= (3 << 4); /* TSI_MUX */ > + break; > + } > + > + return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val); > +} > + > +static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel) > +{ > + int msb, lsb; > + > + switch (channel) { > + case DA9052_ADC_TSI_XP: > + case DA9052_ADC_TSI_XN: > + msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_X_MSB_REG); > + if (msb < 0) > + return msb; > + > + lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG); > + if (lsb < 0) > + return lsb; > + > + break; > + case DA9052_ADC_TSI_YP: > + case DA9052_ADC_TSI_YN: > + msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_Y_MSB_REG); > + if (msb < 0) > + return msb; > + > + lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG); > + if (lsb < 0) > + return lsb; > + lsb >>= 2; > + > + break; > + default: > + return -ENXIO; > + } > + > + return (msb << 2) | (lsb & 0x3); > +} > + > + > +static ssize_t __da9052_read_tsi(struct device *dev, int channel) > +{ > + struct da9052_hwmon *hwmon = dev_get_drvdata(dev); > + int ret; > + > + reinit_completion(&hwmon->tsidone); > + > + ret = da9052_request_tsi_read(hwmon, channel); > + if (ret < 0) > + return ret; > + > + /* Wait for an conversion done interrupt */ > + if (!wait_for_completion_timeout(&hwmon->tsidone, > + msecs_to_jiffies(500))) { > + dev_err(dev, "timeout waiting for TSI conversion interrupt\n"); Is that necessary ? After all, it is reported as -ETIMEOUT. > + return -ETIMEDOUT; > + } > + > + return da9052_get_tsi_result(hwmon, channel); > +} > + > +static ssize_t da9052_read_tsi(struct device *dev, > + struct device_attribute *devattr, > + char *buf) > +{ > + struct da9052_hwmon *hwmon = dev_get_drvdata(dev); > + int channel = to_sensor_dev_attr(devattr)->index; > + int ret; > + > + mutex_lock(&hwmon->hwmon_lock); > + ret = __da9052_read_tsi(dev, channel); > + mutex_unlock(&hwmon->hwmon_lock); > + > + if (ret < 0) > + return ret; > + else > + return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret)); > +} > + > static ssize_t da9052_read_tjunc(struct device *dev, > struct device_attribute *devattr, char *buf) > { > @@ -196,6 +306,28 @@ static ssize_t show_label(struct device *dev, > input_names[to_sensor_dev_attr(devattr)->index]); > } > > +static umode_t da9052_channel_is_visible(struct kobject *kobj, > + struct attribute *a, int index) > +{ > + struct device *dev = container_of(kobj, struct device, kobj); > + struct da9052_hwmon *hwmon = dev_get_drvdata(dev); > + > + switch (index) { > + case DA9052_ADC_TSI_XP: > + case DA9052_ADC_TSI_YP: > + case DA9052_ADC_TSI_XN: > + case DA9052_ADC_TSI_YN: > + break; > + default: > + return a->mode; > + } > + > + if (!hwmon->tsi_as_adc) > + return 0; Moving this into the case statement and using break; in default: would simplify the code and make it a bit easier to read. > + > + return a->mode; > +} > + > static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, > DA9052_ADC_VDDOUT); > static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, > @@ -221,6 +353,23 @@ static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, > static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, > DA9052_ADC_VBBAT); > > +static SENSOR_DEVICE_ATTR(in70_input, S_IRUGO, da9052_read_tsi, NULL, > + DA9052_ADC_TSI_XP); > +static SENSOR_DEVICE_ATTR(in70_label, S_IRUGO, show_label, NULL, > + DA9052_ADC_TSI_XP); > +static SENSOR_DEVICE_ATTR(in71_input, S_IRUGO, da9052_read_tsi, NULL, > + DA9052_ADC_TSI_XN); > +static SENSOR_DEVICE_ATTR(in71_label, S_IRUGO, show_label, NULL, > + DA9052_ADC_TSI_XN); > +static SENSOR_DEVICE_ATTR(in72_input, S_IRUGO, da9052_read_tsi, NULL, > + DA9052_ADC_TSI_YP); > +static SENSOR_DEVICE_ATTR(in72_label, S_IRUGO, show_label, NULL, > + DA9052_ADC_TSI_YP); > +static SENSOR_DEVICE_ATTR(in73_input, S_IRUGO, da9052_read_tsi, NULL, > + DA9052_ADC_TSI_YN); > +static SENSOR_DEVICE_ATTR(in73_label, S_IRUGO, show_label, NULL, > + DA9052_ADC_TSI_YN); > + > static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, > DA9052_ADC_ICH); > static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, > @@ -246,6 +395,14 @@ static struct attribute *da9052_attrs[] = { > &sensor_dev_attr_in5_label.dev_attr.attr, > &sensor_dev_attr_in6_input.dev_attr.attr, > &sensor_dev_attr_in6_label.dev_attr.attr, > + &sensor_dev_attr_in70_input.dev_attr.attr, > + &sensor_dev_attr_in70_label.dev_attr.attr, > + &sensor_dev_attr_in71_input.dev_attr.attr, > + &sensor_dev_attr_in71_label.dev_attr.attr, > + &sensor_dev_attr_in72_input.dev_attr.attr, > + &sensor_dev_attr_in72_label.dev_attr.attr, > + &sensor_dev_attr_in73_input.dev_attr.attr, > + &sensor_dev_attr_in73_label.dev_attr.attr, > &sensor_dev_attr_in9_input.dev_attr.attr, > &sensor_dev_attr_in9_label.dev_attr.attr, > &sensor_dev_attr_curr1_input.dev_attr.attr, > @@ -257,29 +414,93 @@ static struct attribute *da9052_attrs[] = { > NULL > }; > > -ATTRIBUTE_GROUPS(da9052); > +static const struct attribute_group da9052_group = { > + .attrs = da9052_attrs, > + .is_visible = da9052_channel_is_visible, > +}; > +__ATTRIBUTE_GROUPS(da9052); > + > +static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data) > +{ > + struct da9052_hwmon *hwmon = data; Please make sure that there are no checkpatch warnings or errors. I am quite sure here is one. > + complete(&hwmon->tsidone); > + return IRQ_HANDLED; > +} > > static int da9052_hwmon_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > struct da9052_hwmon *hwmon; > struct device *hwmon_dev; > + int err; > > hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL); > if (!hwmon) > return -ENOMEM; > > + platform_set_drvdata(pdev, hwmon); > + > mutex_init(&hwmon->hwmon_lock); > hwmon->da9052 = dev_get_drvdata(pdev->dev.parent); > > + init_completion(&hwmon->tsidone); > + > + hwmon->tsi_as_adc = > + device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc"); > + > + /* get tsiref from DT, default to 2.5 Volt (typ. value in datasheet) */ > + hwmon->tsiref_mv = 2500000; > + device_property_read_u32(pdev->dev.parent, "diag,tsiref-microvolt", > + &hwmon->tsiref_mv); > + > + /* convert from microvolt (DT) to millivolt (hwmon) */ > + hwmon->tsiref_mv /= 1000; > + > + /* TSIREF must be between 1.8 and 2.6 Volt according to datasheet */ > + if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) { > + dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d\n", > + hwmon->tsiref_mv); > + return -ENXIO; > + } > + > + if (hwmon->tsi_as_adc) { > + /* disable touchscreen features */ > + da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00); > + > + err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, > + "tsiready-irq", da9052_tsi_datardy_irq, > + hwmon); > + if (err) { > + dev_err(hwmon->da9052->dev, > + "Failed to register TSIRDY IRQ: %d\n", err); > + return err; > + } > + } > + > hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052", > hwmon, > da9052_groups); > - return PTR_ERR_OR_ZERO(hwmon_dev); > + err = PTR_ERR_OR_ZERO(hwmon_dev); > + if (err) { > + if (hwmon->tsi_as_adc) > + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); > + return err; > + } > + > + return 0; > +} > + > +static int da9052_hwmon_remove(struct platform_device *pdev) > +{ > + struct da9052_hwmon *hwmon = platform_get_drvdata(pdev); > + if (hwmon->tsi_as_adc) > + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); > + return 0; > } > > static struct platform_driver da9052_hwmon_driver = { > .probe = da9052_hwmon_probe, > + .remove = da9052_hwmon_remove, > .driver = { > .name = "da9052-hwmon", > }, > diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c > index 5a013bb7bcad..f0cb239546a9 100644 > --- a/drivers/input/touchscreen/da9052_tsi.c > +++ b/drivers/input/touchscreen/da9052_tsi.c > @@ -16,6 +16,7 @@ > #include > #include > #include > +#include > > #include > #include > @@ -238,6 +239,10 @@ static int da9052_ts_probe(struct platform_device *pdev) > if (!da9052) > return -EINVAL; > > + /* check if pins are used as general purpose ADC input */ > + if (device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc")) > + return -ENODEV; > + > tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL); > input_dev = input_allocate_device(); > if (!tsi || !input_dev) { > diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h > index ce9230af09c2..ae5b663836d0 100644 > --- a/include/linux/mfd/da9052/da9052.h > +++ b/include/linux/mfd/da9052/da9052.h > @@ -45,6 +45,12 @@ > #define DA9052_ADC_TJUNC 8 > #define DA9052_ADC_VBBAT 9 > > +/* TSI channel has its own 4 channel mux */ > +#define DA9052_ADC_TSI_XP 70 > +#define DA9052_ADC_TSI_XN 71 > +#define DA9052_ADC_TSI_YP 72 > +#define DA9052_ADC_TSI_YN 73 > + > #define DA9052_IRQ_DCIN 0 > #define DA9052_IRQ_VBUS 1 > #define DA9052_IRQ_DCINREM 2 > -- > 2.11.0 >