1 // SPDX-License-Identifier: GPL-2.0-only
2 /* MCP23S08 SPI GPIO driver */
8 #include <linux/spi/spi.h>
10 #include "pinctrl-mcp23s08.h"
18  * Driver data holds all the per-chip data.
29 	struct spi_device *spi = to_spi_device(mcp->dev);  in mcp23sxx_spi_write()  local
31 	struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, },  in mcp23sxx_spi_write()
38 	return spi_sync(spi, &m);  in mcp23sxx_spi_write()
46 	struct spi_device *spi = to_spi_device(mcp->dev);  in mcp23sxx_spi_gather_write()  local
48 	struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, },  in mcp23sxx_spi_gather_write()
57 	return spi_sync(spi, &m);  in mcp23sxx_spi_gather_write()
64 	struct spi_device *spi = to_spi_device(mcp->dev);  in mcp23sxx_spi_read()  local
68 		return -EINVAL;  in mcp23sxx_spi_read()
70 	tx[0] = mcp->addr | 0x01;  in mcp23sxx_spi_read()
73 	return spi_write_then_read(spi, tx, sizeof(tx), val, val_size);  in mcp23sxx_spi_read()
89 	switch (info->type) {  in mcp23s08_spi_regmap_init()
91 		mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s08.%d", addr);  in mcp23s08_spi_regmap_init()
92 		if (!mcp->chip.label)  in mcp23s08_spi_regmap_init()
93 			return -ENOMEM;  in mcp23s08_spi_regmap_init()
97 			return -ENOMEM;  in mcp23s08_spi_regmap_init()
102 		mcp->chip.label = devm_kasprintf(dev, GFP_KERNEL, "mcp23s17.%d", addr);  in mcp23s08_spi_regmap_init()
103 		if (!mcp->chip.label)  in mcp23s08_spi_regmap_init()
104 			return -ENOMEM;  in mcp23s08_spi_regmap_init()
108 			return -ENOMEM;  in mcp23s08_spi_regmap_init()
113 		mcp->chip.label = info->label;  in mcp23s08_spi_regmap_init()
114 		name = info->regmap->name;  in mcp23s08_spi_regmap_init()
118 		dev_err(dev, "invalid device type (%d)\n", info->type);  in mcp23s08_spi_regmap_init()
119 		return -EINVAL;  in mcp23s08_spi_regmap_init()
122 	mcp->reg_shift = info->reg_shift;  in mcp23s08_spi_regmap_init()
123 	mcp->chip.ngpio = info->ngpio;  in mcp23s08_spi_regmap_init()
124 	copy = devm_kmemdup(dev, info->regmap, sizeof(*info->regmap), GFP_KERNEL);  in mcp23s08_spi_regmap_init()
126 		return -ENOMEM;  in mcp23s08_spi_regmap_init()
128 	copy->name = name;  in mcp23s08_spi_regmap_init()
130 	mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, copy);  in mcp23s08_spi_regmap_init()
131 	if (IS_ERR(mcp->regmap))  in mcp23s08_spi_regmap_init()
132 		dev_err(dev, "regmap init failed for %s\n", mcp->chip.label);  in mcp23s08_spi_regmap_init()
133 	return PTR_ERR_OR_ZERO(mcp->regmap);  in mcp23s08_spi_regmap_init()
136 static int mcp23s08_probe(struct spi_device *spi)  in mcp23s08_probe()  argument
140 	struct device *dev = &spi->dev;  in mcp23s08_probe()
148 	info = spi_get_device_match_data(spi);  in mcp23s08_probe()
150 	ret = device_property_read_u32(dev, "microchip,spi-present-mask", &v);  in mcp23s08_probe()
152 		ret = device_property_read_u32(dev, "mcp,spi-present-mask", &v);  in mcp23s08_probe()
154 			dev_err(dev, "missing spi-present-mask");  in mcp23s08_probe()
161 		dev_err(dev, "invalid spi-present-mask");  in mcp23s08_probe()
162 		return -ENODEV;  in mcp23s08_probe()
169 		return -ENOMEM;  in mcp23s08_probe()
171 	spi_set_drvdata(spi, data);  in mcp23s08_probe()
174 		data->mcp[addr] = &data->chip[--chips];  in mcp23s08_probe()
175 		data->mcp[addr]->irq = spi->irq;  in mcp23s08_probe()
177 		ret = mcp23s08_spi_regmap_init(data->mcp[addr], dev, addr, info);  in mcp23s08_probe()
181 		data->mcp[addr]->pinctrl_desc.name = devm_kasprintf(dev, GFP_KERNEL,  in mcp23s08_probe()
182 								    "mcp23xxx-pinctrl.%d",  in mcp23s08_probe()
184 		if (!data->mcp[addr]->pinctrl_desc.name)  in mcp23s08_probe()
185 			return -ENOMEM;  in mcp23s08_probe()
187 		ret = mcp23s08_probe_one(data->mcp[addr], dev, 0x40 | (addr << 1),  in mcp23s08_probe()
188 					 info->type, -1);  in mcp23s08_probe()
192 		ngpio += data->mcp[addr]->chip.ngpio;  in mcp23s08_probe()
194 	data->ngpio = ngpio;  in mcp23s08_probe()
227 MODULE_DEVICE_TABLE(spi, mcp23s08_ids);
255  * Register after SPI postcore initcall and before
266 MODULE_DESCRIPTION("MCP23S08 SPI GPIO driver");