1 // SPDX-License-Identifier: GPL-2.0-only
3  * TI/National Semiconductor LP3943 GPIO driver
12 #include <linux/gpio/driver.h>
42 	u16 input_mask;		/* 1 = GPIO is input direction, 0 = output */
48 	struct lp3943 *lp3943 = lp3943_gpio->lp3943;  in lp3943_gpio_request()
51 	if (test_and_set_bit(offset, &lp3943->pin_used))  in lp3943_gpio_request()
52 		return -EBUSY;  in lp3943_gpio_request()
60 	struct lp3943 *lp3943 = lp3943_gpio->lp3943;  in lp3943_gpio_free()
62 	clear_bit(offset, &lp3943->pin_used);  in lp3943_gpio_free()
68 	struct lp3943 *lp3943 = lp3943_gpio->lp3943;  in lp3943_gpio_set_mode()
69 	const struct lp3943_reg_cfg *mux = lp3943->mux_cfg;  in lp3943_gpio_set_mode()  local
71 	return lp3943_update_bits(lp3943, mux[offset].reg, mux[offset].mask,  in lp3943_gpio_set_mode()
72 				  val << mux[offset].shift);  in lp3943_gpio_set_mode()
79 	lp3943_gpio->input_mask |= BIT(offset);  in lp3943_gpio_direction_input()
96 		offset = offset - 8;  in lp3943_get_gpio_in_status()
99 		return -EINVAL;  in lp3943_get_gpio_in_status()
102 	err = lp3943_read_byte(lp3943_gpio->lp3943, addr, &read);  in lp3943_get_gpio_in_status()
112 	struct lp3943 *lp3943 = lp3943_gpio->lp3943;  in lp3943_get_gpio_out_status()
113 	const struct lp3943_reg_cfg *mux = lp3943->mux_cfg;  in lp3943_get_gpio_out_status()  local
117 	err = lp3943_read_byte(lp3943, mux[offset].reg, &read);  in lp3943_get_gpio_out_status()
121 	read = (read & mux[offset].mask) >> mux[offset].shift;  in lp3943_get_gpio_out_status()
128 		return -EINVAL;  in lp3943_get_gpio_out_status()
137 	 *   LP3943 doesn't have the GPIO direction register. It provides  in lp3943_gpio_get()
144 	if (lp3943_gpio->input_mask & BIT(offset))  in lp3943_gpio_get()
169 	lp3943_gpio->input_mask &= ~BIT(offset);  in lp3943_gpio_direction_output()
183 	.base			= -1,
190 	struct lp3943 *lp3943 = dev_get_drvdata(pdev->dev.parent);  in lp3943_gpio_probe()
193 	lp3943_gpio = devm_kzalloc(&pdev->dev, sizeof(*lp3943_gpio),  in lp3943_gpio_probe()
196 		return -ENOMEM;  in lp3943_gpio_probe()
198 	lp3943_gpio->lp3943 = lp3943;  in lp3943_gpio_probe()
199 	lp3943_gpio->chip = lp3943_gpio_chip;  in lp3943_gpio_probe()
200 	lp3943_gpio->chip.parent = &pdev->dev;  in lp3943_gpio_probe()
204 	return devm_gpiochip_add_data(&pdev->dev, &lp3943_gpio->chip,  in lp3943_gpio_probe()
209 	{ .compatible = "ti,lp3943-gpio", },
217 		.name = "lp3943-gpio",
223 MODULE_DESCRIPTION("LP3943 GPIO driver");
224 MODULE_ALIAS("platform:lp3943-gpio");