From 67dfabe3a01be6b0cc4c0056aa546f0279ed6279 Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Mon, 21 Aug 2017 16:54:01 +0200 Subject: [PATCH 1/4] mfd: da9052: Add register details for TSI Add register details an channels definition for using the TSI registers in the hwmon driver. Signed-off-by: Sebastian Reichel Signed-off-by: Lee Jones --- include/linux/mfd/da9052/da9052.h | 6 ++++++ include/linux/mfd/da9052/reg.h | 11 ++++++++++- 2 files changed, 16 insertions(+), 1 deletion(-) 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 diff --git a/include/linux/mfd/da9052/reg.h b/include/linux/mfd/da9052/reg.h index 5010f978725c..76780ea8849c 100644 --- a/include/linux/mfd/da9052/reg.h +++ b/include/linux/mfd/da9052/reg.h @@ -690,7 +690,10 @@ /* TSI CONTROL REGISTER B BITS */ #define DA9052_TSICONTB_ADCREF 0X80 #define DA9052_TSICONTB_TSIMAN 0X40 -#define DA9052_TSICONTB_TSIMUX 0X30 +#define DA9052_TSICONTB_TSIMUX_XP 0X00 +#define DA9052_TSICONTB_TSIMUX_YP 0X10 +#define DA9052_TSICONTB_TSIMUX_XN 0X20 +#define DA9052_TSICONTB_TSIMUX_YN 0X30 #define DA9052_TSICONTB_TSISEL3 0X08 #define DA9052_TSICONTB_TSISEL2 0X04 #define DA9052_TSICONTB_TSISEL1 0X02 @@ -705,8 +708,14 @@ /* TSI CO-ORDINATE LSB RESULT REGISTER BITS */ #define DA9052_TSILSB_PENDOWN 0X40 #define DA9052_TSILSB_TSIZL 0X30 +#define DA9052_TSILSB_TSIZL_SHIFT 4 +#define DA9052_TSILSB_TSIZL_BITS 2 #define DA9052_TSILSB_TSIYL 0X0C +#define DA9052_TSILSB_TSIYL_SHIFT 2 +#define DA9052_TSILSB_TSIYL_BITS 2 #define DA9052_TSILSB_TSIXL 0X03 +#define DA9052_TSILSB_TSIXL_SHIFT 0 +#define DA9052_TSILSB_TSIXL_BITS 2 /* TSI Z MEASUREMENT MSB RESULT REGISTER BIT */ #define DA9052_TSIZMSB_TSIZM 0XFF From 7fe9899ef4e4e6d152a3a54e262cda38e1e1a1d3 Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Mon, 21 Aug 2017 16:54:03 +0200 Subject: [PATCH 2/4] hwmon: da9052: Replace S_IRUGO with 0444 Fix checkpatch warnings about S_IRUGO being less readable than providing the permissions octal as '0444'. Acked-by: Guenter Roeck Signed-off-by: Sebastian Reichel Signed-off-by: Lee Jones --- drivers/hwmon/da9052-hwmon.c | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-) diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c index c9832bfacfe5..708c91ac601f 100644 --- a/drivers/hwmon/da9052-hwmon.c +++ b/drivers/hwmon/da9052-hwmon.c @@ -196,43 +196,43 @@ static ssize_t show_label(struct device *dev, input_names[to_sensor_dev_attr(devattr)->index]); } -static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, da9052_read_vddout, NULL, +static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL, DA9052_ADC_VDDOUT); -static SENSOR_DEVICE_ATTR(in0_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL, DA9052_ADC_VDDOUT); -static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, da9052_read_vbat, NULL, +static SENSOR_DEVICE_ATTR(in3_input, 0444, da9052_read_vbat, NULL, DA9052_ADC_VBAT); -static SENSOR_DEVICE_ATTR(in3_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(in3_label, 0444, show_label, NULL, DA9052_ADC_VBAT); -static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, da9052_read_misc_channel, NULL, +static SENSOR_DEVICE_ATTR(in4_input, 0444, da9052_read_misc_channel, NULL, DA9052_ADC_IN4); -static SENSOR_DEVICE_ATTR(in4_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(in4_label, 0444, show_label, NULL, DA9052_ADC_IN4); -static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, da9052_read_misc_channel, NULL, +static SENSOR_DEVICE_ATTR(in5_input, 0444, da9052_read_misc_channel, NULL, DA9052_ADC_IN5); -static SENSOR_DEVICE_ATTR(in5_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(in5_label, 0444, show_label, NULL, DA9052_ADC_IN5); -static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, da9052_read_misc_channel, NULL, +static SENSOR_DEVICE_ATTR(in6_input, 0444, da9052_read_misc_channel, NULL, DA9052_ADC_IN6); -static SENSOR_DEVICE_ATTR(in6_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(in6_label, 0444, show_label, NULL, DA9052_ADC_IN6); -static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, da9052_read_vbbat, NULL, +static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL, DA9052_ADC_VBBAT); -static SENSOR_DEVICE_ATTR(in9_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL, DA9052_ADC_VBBAT); -static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, da9052_read_ich, NULL, +static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL, DA9052_ADC_ICH); -static SENSOR_DEVICE_ATTR(curr1_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL, DA9052_ADC_ICH); -static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, da9052_read_tbat, NULL, +static SENSOR_DEVICE_ATTR(temp2_input, 0444, da9052_read_tbat, NULL, DA9052_ADC_TBAT); -static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(temp2_label, 0444, show_label, NULL, DA9052_ADC_TBAT); -static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, da9052_read_tjunc, NULL, +static SENSOR_DEVICE_ATTR(temp8_input, 0444, da9052_read_tjunc, NULL, DA9052_ADC_TJUNC); -static SENSOR_DEVICE_ATTR(temp8_label, S_IRUGO, show_label, NULL, +static SENSOR_DEVICE_ATTR(temp8_label, 0444, show_label, NULL, DA9052_ADC_TJUNC); static struct attribute *da9052_attrs[] = { From ebf555111bc11a5da9144e4af524260731a8b968 Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Mon, 21 Aug 2017 16:54:02 +0200 Subject: [PATCH 3/4] mfd: da9052: Make touchscreen registration optional If the touchscreen pins are used as general purpose analogue input, the touchscreen driver should not be used. The pins will be handled by the existing hwmon driver instead. Signed-off-by: Sebastian Reichel Signed-off-by: Lee Jones --- drivers/mfd/da9052-core.c | 26 +++++++++++++++++++++++--- 1 file changed, 23 insertions(+), 3 deletions(-) diff --git a/drivers/mfd/da9052-core.c b/drivers/mfd/da9052-core.c index a88c2065d8ab..a23a3a1c7061 100644 --- a/drivers/mfd/da9052-core.c +++ b/drivers/mfd/da9052-core.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include @@ -518,9 +519,6 @@ static const struct mfd_cell da9052_subdev_info[] = { { .name = "da9052-wled3", }, - { - .name = "da9052-tsi", - }, { .name = "da9052-bat", }, @@ -529,6 +527,10 @@ static const struct mfd_cell da9052_subdev_info[] = { }, }; +static const struct mfd_cell da9052_tsi_subdev_info[] = { + { .name = "da9052-tsi" }, +}; + const struct regmap_config da9052_regmap_config = { .reg_bits = 8, .val_bits = 8, @@ -619,9 +621,27 @@ int da9052_device_init(struct da9052 *da9052, u8 chip_id) goto err; } + /* + * Check if touchscreen pins are used are analogue input instead + * of having a touchscreen connected to them. The analogue input + * functionality will be provided by hwmon driver (if enabled). + */ + if (!device_property_read_bool(da9052->dev, "dlg,tsi-as-adc")) { + ret = mfd_add_devices(da9052->dev, PLATFORM_DEVID_AUTO, + da9052_tsi_subdev_info, + ARRAY_SIZE(da9052_tsi_subdev_info), + NULL, 0, NULL); + if (ret) { + dev_err(da9052->dev, "failed to add TSI subdev: %d\n", + ret); + goto err; + } + } + return 0; err: + mfd_remove_devices(da9052->dev); da9052_irq_exit(da9052); return ret; From 4f16cab19a3d57638dd5d962ff6e87c154a6cab2 Mon Sep 17 00:00:00 2001 From: Sebastian Reichel Date: Mon, 21 Aug 2017 16:54:04 +0200 Subject: [PATCH 4/4] hwmon: da9052: Add support for TSI channel 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. Acked-by: Guenter Roeck Signed-off-by: Sebastian Reichel Signed-off-by: Lee Jones --- drivers/hwmon/da9052-hwmon.c | 249 ++++++++++++++++++++++++++++++++++- 1 file changed, 245 insertions(+), 4 deletions(-) diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c index 708c91ac601f..97a62f5b9ea4 100644 --- a/drivers/hwmon/da9052-hwmon.c +++ b/drivers/hwmon/da9052-hwmon.c @@ -20,13 +20,19 @@ #include #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 regulator *tsiref; + struct completion tsidone; }; static const char * const input_names[] = { @@ -37,6 +43,10 @@ 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 +69,11 @@ 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 +169,97 @@ 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 = DA9052_TSICONTB_TSIMAN; + + switch (channel) { + case DA9052_ADC_TSI_XP: + val |= DA9052_TSICONTB_TSIMUX_XP; + break; + case DA9052_ADC_TSI_YP: + val |= DA9052_TSICONTB_TSIMUX_YP; + break; + case DA9052_ADC_TSI_XN: + val |= DA9052_TSICONTB_TSIMUX_XN; + break; + case DA9052_ADC_TSI_YN: + val |= DA9052_TSICONTB_TSIMUX_YN; + 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) +{ + u8 regs[3]; + int msb, lsb, err; + + /* block read to avoid separation of MSB and LSB */ + err = da9052_group_read(hwmon->da9052, DA9052_TSI_X_MSB_REG, + ARRAY_SIZE(regs), regs); + if (err) + return err; + + switch (channel) { + case DA9052_ADC_TSI_XP: + case DA9052_ADC_TSI_XN: + msb = regs[0] << DA9052_TSILSB_TSIXL_BITS; + lsb = regs[2] & DA9052_TSILSB_TSIXL; + lsb >>= DA9052_TSILSB_TSIXL_SHIFT; + break; + case DA9052_ADC_TSI_YP: + case DA9052_ADC_TSI_YN: + msb = regs[1] << DA9052_TSILSB_TSIYL_BITS; + lsb = regs[2] & DA9052_TSILSB_TSIYL; + lsb >>= DA9052_TSILSB_TSIYL_SHIFT; + break; + default: + return -EINVAL; + } + + return msb | lsb; +} + + +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))) + 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 +302,28 @@ 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 *attr, int index) +{ + struct device *dev = container_of(kobj, struct device, kobj); + struct da9052_hwmon *hwmon = dev_get_drvdata(dev); + struct device_attribute *dattr = container_of(attr, + struct device_attribute, attr); + struct sensor_device_attribute *sattr = to_sensor_dev_attr(dattr); + + if (!hwmon->tsi_as_adc) { + switch (sattr->index) { + case DA9052_ADC_TSI_XP: + case DA9052_ADC_TSI_YP: + case DA9052_ADC_TSI_XN: + case DA9052_ADC_TSI_YN: + return 0; + } + } + + return attr->mode; +} + static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL, DA9052_ADC_VDDOUT); static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL, @@ -221,6 +349,23 @@ static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL, static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL, DA9052_ADC_VBBAT); +static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL, + DA9052_ADC_TSI_XP); +static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL, + DA9052_ADC_TSI_XP); +static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL, + DA9052_ADC_TSI_XN); +static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL, + DA9052_ADC_TSI_XN); +static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL, + DA9052_ADC_TSI_YP); +static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL, + DA9052_ADC_TSI_YP); +static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL, + DA9052_ADC_TSI_YN); +static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL, + DA9052_ADC_TSI_YN); + static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL, DA9052_ADC_ICH); static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL, @@ -246,6 +391,14 @@ 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 +410,117 @@ 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; + + 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, "dlg,tsi-as-adc"); + + if (hwmon->tsi_as_adc) { + hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref"); + if (IS_ERR(hwmon->tsiref)) { + err = PTR_ERR(hwmon->tsiref); + dev_err(&pdev->dev, "failed to get tsiref: %d", err); + return err; + } + + err = regulator_enable(hwmon->tsiref); + if (err) + return err; + + hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref); + if (hwmon->tsiref_mv < 0) { + err = hwmon->tsiref_mv; + goto exit_regulator; + } + + /* convert from microvolt (DT) to millivolt (hwmon) */ + hwmon->tsiref_mv /= 1000; + + /* TSIREF limits from datasheet */ + if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) { + dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d", + hwmon->tsiref_mv); + err = -ENXIO; + goto exit_regulator; + } + + /* 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(&pdev->dev, "Failed to register TSIRDY IRQ: %d", + err); + goto exit_regulator; + } + } + 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) + goto exit_irq; + + return 0; + +exit_irq: + if (hwmon->tsi_as_adc) + da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon); +exit_regulator: + if (hwmon->tsiref) + regulator_disable(hwmon->tsiref); + + return err; +} + +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); + regulator_disable(hwmon->tsiref); + } + + return 0; } static struct platform_driver da9052_hwmon_driver = { .probe = da9052_hwmon_probe, + .remove = da9052_hwmon_remove, .driver = { .name = "da9052-hwmon", },