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Fri, 12 Jun 2026 15:47:06 -0700 (PDT) From: Kurt Borja Date: Fri, 12 Jun 2026 17:46:21 -0500 Subject: [PATCH 3/5] iio: adc: ti-ads1262: Add GPIO controller support Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260612-ads126x-v1-3-894c788d03ed@gmail.com> References: <20260612-ads126x-v1-0-894c788d03ed@gmail.com> In-Reply-To: <20260612-ads126x-v1-0-894c788d03ed@gmail.com> To: Jonathan Cameron , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Linus Walleij , Bartosz Golaszewski Cc: David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, Kurt Borja , Jonathan Cameron X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=5460; i=kuurtb@gmail.com; h=from:subject:message-id; bh=oHvglOPKruBb8v3/CxYpF7DzHgE+dGuZHbuEgkrWZec=; b=owGbwMvMwCUmluBs8WX+lTTG02pJDFk6PUmZU5d+C1WMOdvLfHn7XZ+Hh62W9MvdNyuSW9TWH RC0Mamjo5SFQYyLQVZMkaU9YdG3R1F5b/0OhN6HmcPKBDKEgYtTACYiksLwT9+I6by7ofbspjNO x3O19lVvlo7cKKvg/Xtf+8bq73xSOowMU7xLOl98LvzKduDQe5EI6V1a1oGRe14t2iXZy8vyu7i XFQA= X-Developer-Key: i=kuurtb@gmail.com; a=openpgp; fpr=54D3BE170AEF777983C3C63B57E3B6585920A69A Add support for the GPIO controller capability found in both TI ADS1262 and ADS1263 ADCs. Eight analog input pins can be programmed as GPIO. This configuration does not prevent the pins from being used as analog inputs at the same time, so no considerations were taken in that regard. Signed-off-by: Kurt Borja --- drivers/iio/adc/ti-ads1262.c | 149 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) diff --git a/drivers/iio/adc/ti-ads1262.c b/drivers/iio/adc/ti-ads1262.c index fd1911cf65ac..6d5f22836ad8 100644 --- a/drivers/iio/adc/ti-ads1262.c +++ b/drivers/iio/adc/ti-ads1262.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -314,6 +315,10 @@ static const int ads1262_pga_gain_avail[] = { 1, 2, 4, 8, 16, 32 }; +static const char * const ads1262_gpio_names[] = { + "AIN3", "AIN4", "AIN5", "AIN6", "AIN7", "AIN8", "AIN9", "AINCOM" +}; + static int ads1262_dev_power_on(struct ads1262 *st) { int ret; @@ -1050,6 +1055,146 @@ static irqreturn_t ads1262_trigger_handler(int irq, void *p) return IRQ_HANDLED; } +static int ads1262_gpiochip_request(struct gpio_chip *gc, unsigned int offset) +{ + struct ads1262 *st = gpiochip_get_data(gc); + struct device *dev = &st->spi->dev; + int ret; + + ret = pm_runtime_resume_and_get(dev); + if (ret) + return ret; + + return regmap_update_bits(st->regmap, ADS1262_GPIOCON_REG, + BIT(offset), BIT(offset)); +} + +static void ads1262_gpiochip_free(struct gpio_chip *gc, unsigned int offset) +{ + struct ads1262 *st = gpiochip_get_data(gc); + struct device *dev = &st->spi->dev; + + regmap_update_bits(st->regmap, ADS1262_GPIOCON_REG, BIT(offset), 0); + pm_runtime_put_autosuspend(dev); +} + +static int ads1262_gpiochip_get_direction(struct gpio_chip *gc, + unsigned int offset) +{ + struct ads1262 *st = gpiochip_get_data(gc); + unsigned int val; + int ret; + + ret = regmap_read(st->regmap, ADS1262_GPIODIR_REG, &val); + if (ret) + return ret; + + return val & BIT(offset); +} + +static int ads1262_gpiochip_direction_input(struct gpio_chip *gc, + unsigned int offset) +{ + struct ads1262 *st = gpiochip_get_data(gc); + + return regmap_update_bits(st->regmap, ADS1262_GPIODIR_REG, + BIT(offset), 1); +} + +static int ads1262_gpiochip_direction_output(struct gpio_chip *gc, + unsigned int offset, int value) +{ + struct ads1262 *st = gpiochip_get_data(gc); + int ret; + + ret = regmap_update_bits(st->regmap, ADS1262_GPIODIR_REG, + BIT(offset), 0); + if (ret) + return ret; + + return regmap_update_bits(st->regmap, ADS1262_GPIODAT_REG, + BIT(offset), value ? BIT(offset) : 0); +} + +static int ads1262_gpiochip_get(struct gpio_chip *gc, unsigned int offset) +{ + struct ads1262 *st = gpiochip_get_data(gc); + unsigned int val; + int ret; + + ret = regmap_read(st->regmap, ADS1262_GPIODAT_REG, &val); + if (ret) + return ret; + + return val & BIT(offset); +} + +static int ads1262_gpiochip_get_multiple(struct gpio_chip *gc, + unsigned long *mask, + unsigned long *bits) +{ + struct ads1262 *st = gpiochip_get_data(gc); + unsigned int val; + int ret; + + ret = regmap_read(st->regmap, ADS1262_GPIODAT_REG, &val); + if (ret) + return ret; + + return val & *mask; +} + +static int ads1262_gpiochip_set(struct gpio_chip *gc, unsigned int offset, + int value) +{ + struct ads1262 *st = gpiochip_get_data(gc); + + return regmap_update_bits(st->regmap, ADS1262_GPIODAT_REG, + BIT(offset), value ? BIT(offset) : 0); +} + +static int ads1262_gpiochip_set_multiple(struct gpio_chip *gc, + unsigned long *mask, + unsigned long *bits) +{ + struct ads1262 *st = gpiochip_get_data(gc); + + return regmap_update_bits(st->regmap, ADS1262_GPIODAT_REG, *mask, + *bits); +} + +static int ads1262_gpiochip_setup(struct ads1262 *st, const char *name) +{ + struct device *dev = &st->spi->dev; + struct gpio_chip *gc; + + if (!device_property_present(dev, "gpio-controller")) + return 0; + + gc = devm_kzalloc(dev, sizeof(*gc), GFP_KERNEL); + if (!gc) + return -ENOMEM; + + gc->owner = THIS_MODULE; + gc->label = name; + gc->base = -1; + gc->ngpio = ARRAY_SIZE(ads1262_gpio_names); + gc->parent = dev; + gc->can_sleep = true; + gc->request = ads1262_gpiochip_request; + gc->free = ads1262_gpiochip_free; + gc->get_direction = ads1262_gpiochip_get_direction; + gc->direction_input = ads1262_gpiochip_direction_input; + gc->direction_output = ads1262_gpiochip_direction_output; + gc->get = ads1262_gpiochip_get; + gc->get_multiple = ads1262_gpiochip_get_multiple; + gc->set = ads1262_gpiochip_set; + gc->set_multiple = ads1262_gpiochip_set_multiple; + gc->names = ads1262_gpio_names; + + return devm_gpiochip_add_data(dev, gc, st); +} + static int ads1262_parse_channel_data(struct ads1262 *st, struct ads1262_channel *chan_data, struct fwnode_handle *node) @@ -1750,6 +1895,10 @@ static int ads1262_spi_probe(struct spi_device *spi) if (ret) return ret; + ret = ads1262_gpiochip_setup(st, name); + if (ret) + return ret; + return devm_iio_device_register(dev, indio_dev); } -- 2.54.0