Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * The Gateworks System Controller (GSC) is a multi-function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * device designed for use in Gateworks Single Board Computers.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * The control interface is I2C, with an interrupt. The device supports
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * system functions such as push-button monitoring, multiple ADC's for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * voltage and temperature monitoring, fan controller and watchdog monitor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Copyright (C) 2020 Gateworks Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/mfd/gsc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/of.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/regmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  * The GSC suffers from an errata where occasionally during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  * ADC cycles the chip can NAK I2C transactions. To ensure we have reliable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  * register access we place retries around register access.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #define I2C_RETRIES	3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) int gsc_write(void *context, unsigned int reg, unsigned int val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct i2c_client *client = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	int retry, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	for (retry = 0; retry < I2C_RETRIES; retry++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 		ret = i2c_smbus_write_byte_data(client, reg, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		 * -EAGAIN returned when the i2c host controller is busy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 		 * -EIO returned when i2c device is busy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 		if (ret != -EAGAIN && ret != -EIO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) EXPORT_SYMBOL_GPL(gsc_write);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) int gsc_read(void *context, unsigned int reg, unsigned int *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	struct i2c_client *client = context;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	int retry, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	for (retry = 0; retry < I2C_RETRIES; retry++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		ret = i2c_smbus_read_byte_data(client, reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 		/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		 * -EAGAIN returned when the i2c host controller is busy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		 * -EIO returned when i2c device is busy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		if (ret != -EAGAIN && ret != -EIO)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	*val = ret & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) EXPORT_SYMBOL_GPL(gsc_read);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72)  * gsc_powerdown - API to use GSC to power down board for a specific time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74)  * secs - number of seconds to remain powered off
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static int gsc_powerdown(struct gsc_dev *gsc, unsigned long secs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	unsigned char regs[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	dev_info(&gsc->i2c->dev, "GSC powerdown for %ld seconds\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		 secs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	put_unaligned_le32(secs, regs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	ret = regmap_bulk_write(gsc->regmap, GSC_TIME_ADD, regs, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	ret = regmap_update_bits(gsc->regmap, GSC_CTRL_1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 				 BIT(GSC_CTRL_1_SLEEP_ADD),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 				 BIT(GSC_CTRL_1_SLEEP_ADD));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	ret = regmap_update_bits(gsc->regmap, GSC_CTRL_1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 				 BIT(GSC_CTRL_1_SLEEP_ACTIVATE) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 				 BIT(GSC_CTRL_1_SLEEP_ENABLE),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 				 BIT(GSC_CTRL_1_SLEEP_ACTIVATE) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 				 BIT(GSC_CTRL_1_SLEEP_ENABLE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static ssize_t gsc_show(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 			char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	struct gsc_dev *gsc = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	const char *name = attr->attr.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	int rz = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	if (strcasecmp(name, "fw_version") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 		rz = sprintf(buf, "%d\n", gsc->fwver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	else if (strcasecmp(name, "fw_crc") == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		rz = sprintf(buf, "0x%04x\n", gsc->fwcrc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		dev_err(dev, "invalid command: '%s'\n", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	return rz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static ssize_t gsc_store(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 			 const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	struct gsc_dev *gsc = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	const char *name = attr->attr.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	long value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	if (strcasecmp(name, "powerdown") == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 		if (kstrtol(buf, 0, &value) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 			gsc_powerdown(gsc, value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		dev_err(dev, "invalid command: '%s\n", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) static struct device_attribute attr_fwver =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	__ATTR(fw_version, 0440, gsc_show, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static struct device_attribute attr_fwcrc =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	__ATTR(fw_crc, 0440, gsc_show, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static struct device_attribute attr_pwrdown =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	__ATTR(powerdown, 0220, NULL, gsc_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static struct attribute *gsc_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	&attr_fwver.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	&attr_fwcrc.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	&attr_pwrdown.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static struct attribute_group attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	.attrs = gsc_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static const struct of_device_id gsc_of_match[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	{ .compatible = "gw,gsc", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	{ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) MODULE_DEVICE_TABLE(of, gsc_of_match);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) static struct regmap_bus gsc_regmap_bus = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	.reg_read = gsc_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	.reg_write = gsc_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static const struct regmap_config gsc_regmap_config = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	.reg_bits = 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	.val_bits = 8,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	.cache_type = REGCACHE_NONE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	.max_register = GSC_WP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) static const struct regmap_irq gsc_irqs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	REGMAP_IRQ_REG(GSC_IRQ_PB, 0, BIT(GSC_IRQ_PB)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	REGMAP_IRQ_REG(GSC_IRQ_KEY_ERASED, 0, BIT(GSC_IRQ_KEY_ERASED)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	REGMAP_IRQ_REG(GSC_IRQ_EEPROM_WP, 0, BIT(GSC_IRQ_EEPROM_WP)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	REGMAP_IRQ_REG(GSC_IRQ_RESV, 0, BIT(GSC_IRQ_RESV)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	REGMAP_IRQ_REG(GSC_IRQ_GPIO, 0, BIT(GSC_IRQ_GPIO)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	REGMAP_IRQ_REG(GSC_IRQ_TAMPER, 0, BIT(GSC_IRQ_TAMPER)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	REGMAP_IRQ_REG(GSC_IRQ_WDT_TIMEOUT, 0, BIT(GSC_IRQ_WDT_TIMEOUT)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	REGMAP_IRQ_REG(GSC_IRQ_SWITCH_HOLD, 0, BIT(GSC_IRQ_SWITCH_HOLD)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) static const struct regmap_irq_chip gsc_irq_chip = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	.name = "gateworks-gsc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	.irqs = gsc_irqs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	.num_irqs = ARRAY_SIZE(gsc_irqs),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	.num_regs = 1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	.status_base = GSC_IRQ_STATUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	.mask_base = GSC_IRQ_ENABLE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	.mask_invert = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	.ack_base = GSC_IRQ_STATUS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	.ack_invert = true,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static int gsc_probe(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	struct device *dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	struct gsc_dev *gsc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	struct regmap_irq_chip_data *irq_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	unsigned int reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	gsc = devm_kzalloc(dev, sizeof(*gsc), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	if (!gsc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	gsc->dev = &client->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	gsc->i2c = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	i2c_set_clientdata(client, gsc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	gsc->regmap = devm_regmap_init(dev, &gsc_regmap_bus, client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 				       &gsc_regmap_config);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	if (IS_ERR(gsc->regmap))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 		return PTR_ERR(gsc->regmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (regmap_read(gsc->regmap, GSC_FW_VER, &reg))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	gsc->fwver = reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	regmap_read(gsc->regmap, GSC_FW_CRC, &reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	gsc->fwcrc = reg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	regmap_read(gsc->regmap, GSC_FW_CRC + 1, &reg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	gsc->fwcrc |= reg << 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	gsc->i2c_hwmon = devm_i2c_new_dummy_device(dev, client->adapter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 						   GSC_HWMON);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	if (IS_ERR(gsc->i2c_hwmon)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		dev_err(dev, "Failed to allocate I2C device for HWMON\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		return PTR_ERR(gsc->i2c_hwmon);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	ret = devm_regmap_add_irq_chip(dev, gsc->regmap, client->irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 				       IRQF_ONESHOT | IRQF_SHARED |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 				       IRQF_TRIGGER_LOW, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 				       &gsc_irq_chip, &irq_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	dev_info(dev, "Gateworks System Controller v%d: fw 0x%04x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		 gsc->fwver, gsc->fwcrc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	ret = sysfs_create_group(&dev->kobj, &attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		dev_err(dev, "failed to create sysfs attrs\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	ret = devm_of_platform_populate(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		sysfs_remove_group(&dev->kobj, &attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static int gsc_remove(struct i2c_client *client)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	sysfs_remove_group(&client->dev.kobj, &attr_group);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static struct i2c_driver gsc_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		.name	= "gateworks-gsc",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 		.of_match_table = gsc_of_match,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	.probe_new	= gsc_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	.remove		= gsc_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) module_i2c_driver(gsc_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) MODULE_AUTHOR("Tim Harvey <tharvey@gateworks.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) MODULE_DESCRIPTION("I2C Core interface for GSC");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) MODULE_LICENSE("GPL v2");