1 // SPDX-License-Identifier: GPL-2.0-only OR MIT
3  * Apple SMC GPIO driver
6  * This driver implements basic SMC PMU GPIO support that can read inputs
12 #include <linux/gpio/driver.h>
19  * Commands 0-6 are, presumably, the intended API.
73 	struct apple_smc *smc;  member
85 		return -1;  in macsmc_gpio_nr()
97 	struct apple_smc *smc = smcgp->smc;  in macsmc_gpio_find_first_gpio_index()  local
103 	ret = apple_smc_get_key_by_index(smc, 0, &first_key);  in macsmc_gpio_find_first_gpio_index()
107 		return -ENODEV;  in macsmc_gpio_find_first_gpio_index()
109 	ret = apple_smc_get_key_by_index(smc, smc->key_count - 1, &last_key);  in macsmc_gpio_find_first_gpio_index()
113 		return -ENODEV;  in macsmc_gpio_find_first_gpio_index()
115 	/* Binary search to find index of first SMC key bigger or equal to key */  in macsmc_gpio_find_first_gpio_index()
117 	count = smc->key_count;  in macsmc_gpio_find_first_gpio_index()
120 		int pivot = start + ((count - 1) >> 1);  in macsmc_gpio_find_first_gpio_index()
122 		ret = apple_smc_get_key_by_index(smc, pivot, &pkey);  in macsmc_gpio_find_first_gpio_index()
132 			count -= pivot - start;  in macsmc_gpio_find_first_gpio_index()
135 			count = pivot - start;  in macsmc_gpio_find_first_gpio_index()
150 	ret = apple_smc_rw_u32(smcgp->smc, key, CMD_PINMODE, &val);  in macsmc_gpio_get_direction()
158 	ret = apple_smc_rw_u32(smcgp->smc, key, CMD_IRQ_MODE, &val);  in macsmc_gpio_get_direction()
178 	ret = apple_smc_rw_u32(smcgp->smc, key, cmd, &val);  in macsmc_gpio_get()
192 	ret = apple_smc_write_u32(smcgp->smc, key, CMD_OUTPUT | value);  in macsmc_gpio_set()
194 		dev_err(smcgp->dev, "GPIO set failed %p4ch = 0x%x\n",  in macsmc_gpio_set()
207 	count = min(smcgp->smc->key_count, MAX_GPIO);  in macsmc_gpio_init_valid_mask()
215 		ret = apple_smc_get_key_by_index(smcgp->smc, smcgp->first_index + i, &key);  in macsmc_gpio_init_valid_mask()
224 			dev_err(smcgp->dev, "Bad GPIO key %p4ch\n", &key);  in macsmc_gpio_init_valid_mask()
237 	struct apple_smc *smc = dev_get_drvdata(pdev->dev.parent);  in macsmc_gpio_probe()  local
241 	smcgp = devm_kzalloc(&pdev->dev, sizeof(*smcgp), GFP_KERNEL);  in macsmc_gpio_probe()
243 		return -ENOMEM;  in macsmc_gpio_probe()
245 	smcgp->dev = &pdev->dev;  in macsmc_gpio_probe()
246 	smcgp->smc = smc;  in macsmc_gpio_probe()
248 	smcgp->first_index = macsmc_gpio_find_first_gpio_index(smcgp);  in macsmc_gpio_probe()
249 	if (smcgp->first_index < 0)  in macsmc_gpio_probe()
250 		return smcgp->first_index;  in macsmc_gpio_probe()
252 	ret = apple_smc_get_key_by_index(smc, smcgp->first_index, &key);  in macsmc_gpio_probe()
256 	if (key > macsmc_gpio_key(MAX_GPIO - 1))  in macsmc_gpio_probe()
257 		return -ENODEV;  in macsmc_gpio_probe()
259 	dev_info(smcgp->dev, "First GPIO key: %p4ch\n", &key);  in macsmc_gpio_probe()
261 	smcgp->gc.label = "macsmc-pmu-gpio";  in macsmc_gpio_probe()
262 	smcgp->gc.owner = THIS_MODULE;  in macsmc_gpio_probe()
263 	smcgp->gc.get = macsmc_gpio_get;  in macsmc_gpio_probe()
264 	smcgp->gc.set = macsmc_gpio_set;  in macsmc_gpio_probe()
265 	smcgp->gc.get_direction = macsmc_gpio_get_direction;  in macsmc_gpio_probe()
266 	smcgp->gc.init_valid_mask = macsmc_gpio_init_valid_mask;  in macsmc_gpio_probe()
267 	smcgp->gc.can_sleep = true;  in macsmc_gpio_probe()
268 	smcgp->gc.ngpio = MAX_GPIO;  in macsmc_gpio_probe()
269 	smcgp->gc.base = -1;  in macsmc_gpio_probe()
270 	smcgp->gc.parent = &pdev->dev;  in macsmc_gpio_probe()
272 	return devm_gpiochip_add_data(&pdev->dev, &smcgp->gc, smcgp);  in macsmc_gpio_probe()
276 	{ .compatible = "apple,smc-gpio", },
283 		.name = "macsmc-gpio",
292 MODULE_DESCRIPTION("Apple SMC GPIO driver");