修改led为gpio

hc

2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d

 kernel/drivers/i2c/muxes/i2c-mux-gpio.c
..
..
@@ -1,11 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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2
 /*
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  * I2C multiplexer using GPIO API
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  *
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  * Peter Korsgaard <peter.korsgaard@barco.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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6
  */
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7
 
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 #include <linux/i2c.h>
..
..
@@ -14,26 +11,24 @@
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11
 #include <linux/platform_device.h>
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12
 #include <linux/module.h>
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 #include <linux/slab.h>
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-#include <linux/gpio.h>
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+#include <linux/bits.h>
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+#include <linux/gpio/consumer.h>
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+/* FIXME: stop poking around inside gpiolib */
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 #include "../../gpio/gpiolib.h"
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-#include <linux/of_gpio.h>
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18
 
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 struct gpiomux {
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 	struct i2c_mux_gpio_platform_data data;
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-	unsigned gpio_base;
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+	int ngpios;
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22
 	struct gpio_desc **gpios;
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-	int *values;
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23
 };
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24
 
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 static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val)
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26
 {
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-	int i;
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+	DECLARE_BITMAP(values, BITS_PER_TYPE(val));
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28
 
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-	for (i = 0; i < mux->data.n_gpios; i++)
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-		mux->values[i] = (val >> i) & 1;
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+	values[0] = val;
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30
 
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-	gpiod_set_array_value_cansleep(mux->data.n_gpios,
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-				       mux->gpios, mux->values);
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+	gpiod_set_array_value_cansleep(mux->ngpios, mux->gpios, NULL, values);
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32
 }
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33
 
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 static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
..
..
@@ -54,12 +49,6 @@
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 	return 0;
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 }
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51
 
57
-static int match_gpio_chip_by_label(struct gpio_chip *chip,
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-					      void *data)
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-{
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-	return !strcmp(chip->label, data);
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-}
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-
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52
 #ifdef CONFIG_OF
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 static int i2c_mux_gpio_probe_dt(struct gpiomux *mux,
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54
 					struct platform_device *pdev)
..
..
@@ -67,8 +56,8 @@
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 	struct device_node *np = pdev->dev.of_node;
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 	struct device_node *adapter_np, *child;
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 	struct i2c_adapter *adapter;
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-	unsigned *values, *gpios;
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-	int i = 0, ret;
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+	unsigned *values;
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+	int i = 0;
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61
 
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 	if (!np)
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63
 		return -ENODEV;
..
..
@@ -105,29 +94,6 @@
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94
 	if (of_property_read_u32(np, "idle-state", &mux->data.idle))
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95
 		mux->data.idle = I2C_MUX_GPIO_NO_IDLE;
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96
 
108
-	mux->data.n_gpios = of_gpio_named_count(np, "mux-gpios");
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-	if (mux->data.n_gpios < 0) {
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-		dev_err(&pdev->dev, "Missing mux-gpios property in the DT.\n");
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-		return -EINVAL;
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-	}
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-
114
-	gpios = devm_kcalloc(&pdev->dev,
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-			     mux->data.n_gpios, sizeof(*mux->data.gpios),
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-			     GFP_KERNEL);
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-	if (!gpios) {
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-		dev_err(&pdev->dev, "Cannot allocate gpios array");
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-		return -ENOMEM;
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-	}
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-
122
-	for (i = 0; i < mux->data.n_gpios; i++) {
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-		ret = of_get_named_gpio(np, "mux-gpios", i);
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-		if (ret < 0)
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-			return ret;
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-		gpios[i] = ret;
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-	}
128
-
129
-	mux->data.gpios = gpios;
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-
131
97
 	return 0;
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98
 }
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99
 #else
..
..
@@ -144,8 +110,8 @@
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110
 	struct gpiomux *mux;
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111
 	struct i2c_adapter *parent;
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112
 	struct i2c_adapter *root;
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-	unsigned initial_state, gpio_base;
148
-	int i, ret;
113
+	unsigned initial_state;
114
+	int i, ngpios, ret;
149
115
 
150
116
 	mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);
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117
 	if (!mux)
..
..
@@ -160,37 +126,25 @@
160
126
 			sizeof(mux->data));
161
127
 	}
162
128
 
163
-	/*
164
-	 * If a GPIO chip name is provided, the GPIO pin numbers provided are
165
-	 * relative to its base GPIO number. Otherwise they are absolute.
166
-	 */
167
-	if (mux->data.gpio_chip) {
168
-		struct gpio_chip *gpio;
169
-
170
-		gpio = gpiochip_find(mux->data.gpio_chip,
171
-				     match_gpio_chip_by_label);
172
-		if (!gpio)
173
-			return -EPROBE_DEFER;
174
-
175
-		gpio_base = gpio->base;
176
-	} else {
177
-		gpio_base = 0;
129
+	ngpios = gpiod_count(&pdev->dev, "mux");
130
+	if (ngpios <= 0) {
131
+		dev_err(&pdev->dev, "no valid gpios provided\n");
132
+		return ngpios ?: -EINVAL;
178
133
 	}
134
+	mux->ngpios = ngpios;
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135
 
180
136
 	parent = i2c_get_adapter(mux->data.parent);
181
137
 	if (!parent)
182
138
 		return -EPROBE_DEFER;
183
139
 
184
140
 	muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,
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-			     mux->data.n_gpios * sizeof(*mux->gpios) +
186
-			     mux->data.n_gpios * sizeof(*mux->values), 0,
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+			     ngpios * sizeof(*mux->gpios), 0,
187
142
 			     i2c_mux_gpio_select, NULL);
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143
 	if (!muxc) {
189
144
 		ret = -ENOMEM;
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145
 		goto alloc_failed;
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146
 	}
192
147
 	mux->gpios = muxc->priv;
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-	mux->values = (int *)(mux->gpios + mux->data.n_gpios);
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148
 	muxc->priv = mux;
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149
 
196
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 	platform_set_drvdata(pdev, muxc);
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@@ -198,7 +152,6 @@
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 	root = i2c_root_adapter(&parent->dev);
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153
 
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 	muxc->mux_locked = true;
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-	mux->gpio_base = gpio_base;
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155
 
203
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 	if (mux->data.idle != I2C_MUX_GPIO_NO_IDLE) {
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157
 		initial_state = mux->data.idle;
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@@ -207,34 +160,28 @@
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160
 		initial_state = mux->data.values[0];
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161
 	}
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162
 
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-	for (i = 0; i < mux->data.n_gpios; i++) {
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+	for (i = 0; i < ngpios; i++) {
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164
 		struct device *gpio_dev;
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-		struct gpio_desc *gpio_desc;
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+		struct gpio_desc *gpiod;
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+		enum gpiod_flags flag;
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167
 
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-		ret = gpio_request(gpio_base + mux->data.gpios[i], "i2c-mux-gpio");
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-		if (ret) {
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-			dev_err(&pdev->dev, "Failed to request GPIO %d\n",
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-				mux->data.gpios[i]);
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-			goto err_request_gpio;
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+		if (initial_state & BIT(i))
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+			flag = GPIOD_OUT_HIGH;
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+		else
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+			flag = GPIOD_OUT_LOW;
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+		gpiod = devm_gpiod_get_index(&pdev->dev, "mux", i, flag);
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+		if (IS_ERR(gpiod)) {
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+			ret = PTR_ERR(gpiod);
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+			goto alloc_failed;
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 		}
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-		ret = gpio_direction_output(gpio_base + mux->data.gpios[i],
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-					    initial_state & (1 << i));
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-		if (ret) {
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-			dev_err(&pdev->dev,
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-				"Failed to set direction of GPIO %d to output\n",
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-				mux->data.gpios[i]);
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-			i++;	/* gpio_request above succeeded, so must free */
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-			goto err_request_gpio;
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-		}
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-
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-		gpio_desc = gpio_to_desc(gpio_base + mux->data.gpios[i]);
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-		mux->gpios[i] = gpio_desc;
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+		mux->gpios[i] = gpiod;
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179
 
234
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 		if (!muxc->mux_locked)
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181
 			continue;
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182
 
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-		gpio_dev = &gpio_desc->gdev->dev;
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+		/* FIXME: find a proper way to access the GPIO device */
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+		gpio_dev = &gpiod->gdev->dev;
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 		muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;
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186
 	}
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187
 
..
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@@ -257,10 +204,6 @@
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204
 
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205
 add_adapter_failed:
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206
 	i2c_mux_del_adapters(muxc);
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-	i = mux->data.n_gpios;
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-err_request_gpio:
262
-	for (; i > 0; i--)
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-		gpio_free(gpio_base + mux->data.gpios[i - 1]);
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207
 alloc_failed:
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208
 	i2c_put_adapter(parent);
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209
 
..
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@@ -270,14 +213,8 @@
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213
 static int i2c_mux_gpio_remove(struct platform_device *pdev)
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214
 {
272
215
 	struct i2c_mux_core *muxc = platform_get_drvdata(pdev);
273
-	struct gpiomux *mux = i2c_mux_priv(muxc);
274
-	int i;
275
216
 
276
217
 	i2c_mux_del_adapters(muxc);
277
-
278
-	for (i = 0; i < mux->data.n_gpios; i++)
279
-		gpio_free(mux->gpio_base + mux->data.gpios[i]);
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-
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218
 	i2c_put_adapter(muxc->parent);
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219
 
283
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 	return 0;