1 // SPDX-License-Identifier: GPL-2.0
3  * The Gateworks System Controller (GSC) is a multi-function
6  * system functions such as push-button monitoring, multiple ADC's for
7  * voltage and temperature monitoring, fan controller and watchdog monitor.
15 #include <linux/mfd/gsc.h>
26  * The GSC suffers from an errata where occasionally during
40 		 * -EAGAIN returned when the i2c host controller is busy  in gsc_write()
41 		 * -EIO returned when i2c device is busy  in gsc_write()
43 		if (ret != -EAGAIN && ret != -EIO)  in gsc_write()
59 		 * -EAGAIN returned when the i2c host controller is busy  in gsc_read()
60 		 * -EIO returned when i2c device is busy  in gsc_read()
62 		if (ret != -EAGAIN && ret != -EIO)  in gsc_read()
72  * gsc_powerdown - API to use GSC to power down board for a specific time
74  * secs - number of seconds to remain powered off
76 static int gsc_powerdown(struct gsc_dev *gsc, unsigned long secs)  in gsc_powerdown()  argument
81 	dev_info(&gsc->i2c->dev, "GSC powerdown for %ld seconds\n",  in gsc_powerdown()
85 	ret = regmap_bulk_write(gsc->regmap, GSC_TIME_ADD, regs, 4);  in gsc_powerdown()
89 	ret = regmap_update_bits(gsc->regmap, GSC_CTRL_1,  in gsc_powerdown()
95 	ret = regmap_update_bits(gsc->regmap, GSC_CTRL_1,  in gsc_powerdown()
108 	struct gsc_dev *gsc = dev_get_drvdata(dev);  in gsc_show()  local
109 	const char *name = attr->attr.name;  in gsc_show()
113 		rz = sprintf(buf, "%d\n", gsc->fwver);  in gsc_show()
115 		rz = sprintf(buf, "0x%04x\n", gsc->fwcrc);  in gsc_show()
125 	struct gsc_dev *gsc = dev_get_drvdata(dev);  in gsc_store()  local
126 	const char *name = attr->attr.name;  in gsc_store()
131 			gsc_powerdown(gsc, value);  in gsc_store()
158 	{ .compatible = "gw,gsc", },
187 	.name = "gateworks-gsc",
199 	struct device *dev = &client->dev;  in gsc_probe()
200 	struct gsc_dev *gsc;  in gsc_probe()  local
205 	gsc = devm_kzalloc(dev, sizeof(*gsc), GFP_KERNEL);  in gsc_probe()
206 	if (!gsc)  in gsc_probe()
207 		return -ENOMEM;  in gsc_probe()
209 	gsc->dev = &client->dev;  in gsc_probe()
210 	gsc->i2c = client;  in gsc_probe()
211 	i2c_set_clientdata(client, gsc);  in gsc_probe()
213 	gsc->regmap = devm_regmap_init(dev, &gsc_regmap_bus, client,  in gsc_probe()
215 	if (IS_ERR(gsc->regmap))  in gsc_probe()
216 		return PTR_ERR(gsc->regmap);  in gsc_probe()
218 	if (regmap_read(gsc->regmap, GSC_FW_VER, &reg))  in gsc_probe()
219 		return -EIO;  in gsc_probe()
220 	gsc->fwver = reg;  in gsc_probe()
222 	regmap_read(gsc->regmap, GSC_FW_CRC, &reg);  in gsc_probe()
223 	gsc->fwcrc = reg;  in gsc_probe()
224 	regmap_read(gsc->regmap, GSC_FW_CRC + 1, &reg);  in gsc_probe()
225 	gsc->fwcrc |= reg << 8;  in gsc_probe()
227 	gsc->i2c_hwmon = devm_i2c_new_dummy_device(dev, client->adapter,  in gsc_probe()
229 	if (IS_ERR(gsc->i2c_hwmon)) {  in gsc_probe()
231 		return PTR_ERR(gsc->i2c_hwmon);  in gsc_probe()
234 	ret = devm_regmap_add_irq_chip(dev, gsc->regmap, client->irq,  in gsc_probe()
242 		 gsc->fwver, gsc->fwcrc);  in gsc_probe()
244 	ret = sysfs_create_group(&dev->kobj, &attr_group);  in gsc_probe()
250 		sysfs_remove_group(&dev->kobj, &attr_group);  in gsc_probe()
259 	sysfs_remove_group(&client->dev.kobj, &attr_group);  in gsc_remove()
264 		.name	= "gateworks-gsc",
273 MODULE_DESCRIPTION("I2C Core interface for GSC");