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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * i2c_pca_platform.c
4 *
5 * Platform driver for the PCA9564 I2C controller.
6 *
7 * Copyright (C) 2008 Pengutronix
8 *
9
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/delay.h>
15#include <linux/jiffies.h>
16#include <linux/errno.h>
17#include <linux/i2c.h>
18#include <linux/interrupt.h>
19#include <linux/platform_device.h>
20#include <linux/i2c-algo-pca.h>
21#include <linux/platform_data/i2c-pca-platform.h>
22#include <linux/gpio/consumer.h>
23#include <linux/io.h>
24#include <linux/of.h>
25
26#include <asm/irq.h>
27
28struct i2c_pca_pf_data {
29 void __iomem *reg_base;
30 int irq; /* if 0, use polling */
31 struct gpio_desc *gpio;
32 wait_queue_head_t wait;
33 struct i2c_adapter adap;
34 struct i2c_algo_pca_data algo_data;
35};
36
37/* Read/Write functions for different register alignments */
38
39static int i2c_pca_pf_readbyte8(void *pd, int reg)
40{
41 struct i2c_pca_pf_data *i2c = pd;
42 return ioread8(i2c->reg_base + reg);
43}
44
45static int i2c_pca_pf_readbyte16(void *pd, int reg)
46{
47 struct i2c_pca_pf_data *i2c = pd;
48 return ioread8(i2c->reg_base + reg * 2);
49}
50
51static int i2c_pca_pf_readbyte32(void *pd, int reg)
52{
53 struct i2c_pca_pf_data *i2c = pd;
54 return ioread8(i2c->reg_base + reg * 4);
55}
56
57static void i2c_pca_pf_writebyte8(void *pd, int reg, int val)
58{
59 struct i2c_pca_pf_data *i2c = pd;
60 iowrite8(val, i2c->reg_base + reg);
61}
62
63static void i2c_pca_pf_writebyte16(void *pd, int reg, int val)
64{
65 struct i2c_pca_pf_data *i2c = pd;
66 iowrite8(val, i2c->reg_base + reg * 2);
67}
68
69static void i2c_pca_pf_writebyte32(void *pd, int reg, int val)
70{
71 struct i2c_pca_pf_data *i2c = pd;
72 iowrite8(val, i2c->reg_base + reg * 4);
73}
74
75
76static int i2c_pca_pf_waitforcompletion(void *pd)
77{
78 struct i2c_pca_pf_data *i2c = pd;
79 unsigned long timeout;
80 long ret;
81
82 if (i2c->irq) {
83 ret = wait_event_timeout(i2c->wait,
84 i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
85 & I2C_PCA_CON_SI, i2c->adap.timeout);
86 } else {
87 /* Do polling */
88 timeout = jiffies + i2c->adap.timeout;
89 do {
90 ret = time_before(jiffies, timeout);
91 if (i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
92 & I2C_PCA_CON_SI)
93 break;
94 udelay(100);
95 } while (ret);
96 }
97
98 return ret > 0;
99}
100
101static void i2c_pca_pf_dummyreset(void *pd)
102{
103 struct i2c_pca_pf_data *i2c = pd;
104
105 dev_warn(&i2c->adap.dev, "No reset-pin found. Chip may get stuck!\n");
106}
107
108static void i2c_pca_pf_resetchip(void *pd)
109{
110 struct i2c_pca_pf_data *i2c = pd;
111
112 gpiod_set_value(i2c->gpio, 1);
113 ndelay(100);
114 gpiod_set_value(i2c->gpio, 0);
115}
116
117static irqreturn_t i2c_pca_pf_handler(int this_irq, void *dev_id)
118{
119 struct i2c_pca_pf_data *i2c = dev_id;
120
121 if ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
122 return IRQ_NONE;
123
124 wake_up(&i2c->wait);
125
126 return IRQ_HANDLED;
127}
128
129
130static int i2c_pca_pf_probe(struct platform_device *pdev)
131{
132 struct i2c_pca_pf_data *i2c;
133 struct resource *res;
134 struct i2c_pca9564_pf_platform_data *platform_data =
135 dev_get_platdata(&pdev->dev);
136 struct device_node *np = pdev->dev.of_node;
137 int ret = 0;
138 int irq;
139
140 irq = platform_get_irq_optional(pdev, 0);
141 /* If irq is 0, we do polling. */
142 if (irq < 0)
143 irq = 0;
144
145 i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
146 if (!i2c)
147 return -ENOMEM;
148
149 i2c->reg_base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
150 if (IS_ERR(i2c->reg_base))
151 return PTR_ERR(i2c->reg_base);
152
153
154 init_waitqueue_head(&i2c->wait);
155
156 i2c->irq = irq;
157
158 i2c->adap.nr = pdev->id;
159 i2c->adap.owner = THIS_MODULE;
160 snprintf(i2c->adap.name, sizeof(i2c->adap.name),
161 "PCA9564/PCA9665 at 0x%08lx",
162 (unsigned long) res->start);
163 i2c->adap.algo_data = &i2c->algo_data;
164 i2c->adap.dev.parent = &pdev->dev;
165 i2c->adap.dev.of_node = np;
166
167 i2c->gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
168 if (IS_ERR(i2c->gpio))
169 return PTR_ERR(i2c->gpio);
170
171 i2c->adap.timeout = HZ;
172 ret = device_property_read_u32(&pdev->dev, "clock-frequency",
173 &i2c->algo_data.i2c_clock);
174 if (ret)
175 i2c->algo_data.i2c_clock = 59000;
176
177 if (platform_data) {
178 i2c->adap.timeout = platform_data->timeout;
179 i2c->algo_data.i2c_clock = platform_data->i2c_clock_speed;
180 }
181
182 i2c->algo_data.data = i2c;
183 i2c->algo_data.wait_for_completion = i2c_pca_pf_waitforcompletion;
184 if (i2c->gpio)
185 i2c->algo_data.reset_chip = i2c_pca_pf_resetchip;
186 else
187 i2c->algo_data.reset_chip = i2c_pca_pf_dummyreset;
188
189 switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {
190 case IORESOURCE_MEM_32BIT:
191 i2c->algo_data.write_byte = i2c_pca_pf_writebyte32;
192 i2c->algo_data.read_byte = i2c_pca_pf_readbyte32;
193 break;
194 case IORESOURCE_MEM_16BIT:
195 i2c->algo_data.write_byte = i2c_pca_pf_writebyte16;
196 i2c->algo_data.read_byte = i2c_pca_pf_readbyte16;
197 break;
198 case IORESOURCE_MEM_8BIT:
199 default:
200 i2c->algo_data.write_byte = i2c_pca_pf_writebyte8;
201 i2c->algo_data.read_byte = i2c_pca_pf_readbyte8;
202 break;
203 }
204
205 if (irq) {
206 ret = devm_request_irq(&pdev->dev, irq, i2c_pca_pf_handler,
207 IRQF_TRIGGER_FALLING, pdev->name, i2c);
208 if (ret)
209 return ret;
210 }
211
212 ret = i2c_pca_add_numbered_bus(&i2c->adap);
213 if (ret)
214 return ret;
215
216 platform_set_drvdata(pdev, i2c);
217
218 dev_info(&pdev->dev, "registered.\n");
219
220 return 0;
221}
222
223static void i2c_pca_pf_remove(struct platform_device *pdev)
224{
225 struct i2c_pca_pf_data *i2c = platform_get_drvdata(pdev);
226
227 i2c_del_adapter(&i2c->adap);
228}
229
230#ifdef CONFIG_OF
231static const struct of_device_id i2c_pca_of_match_table[] = {
232 { .compatible = "nxp,pca9564" },
233 { .compatible = "nxp,pca9665" },
234 {},
235};
236MODULE_DEVICE_TABLE(of, i2c_pca_of_match_table);
237#endif
238
239static struct platform_driver i2c_pca_pf_driver = {
240 .probe = i2c_pca_pf_probe,
241 .remove_new = i2c_pca_pf_remove,
242 .driver = {
243 .name = "i2c-pca-platform",
244 .of_match_table = of_match_ptr(i2c_pca_of_match_table),
245 },
246};
247
248module_platform_driver(i2c_pca_pf_driver);
249
250MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
251MODULE_DESCRIPTION("I2C-PCA9564/PCA9665 platform driver");
252MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * i2c_pca_platform.c
4 *
5 * Platform driver for the PCA9564 I2C controller.
6 *
7 * Copyright (C) 2008 Pengutronix
8 *
9
10 */
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/delay.h>
15#include <linux/jiffies.h>
16#include <linux/errno.h>
17#include <linux/i2c.h>
18#include <linux/interrupt.h>
19#include <linux/platform_device.h>
20#include <linux/i2c-algo-pca.h>
21#include <linux/platform_data/i2c-pca-platform.h>
22#include <linux/gpio/consumer.h>
23#include <linux/io.h>
24#include <linux/of.h>
25#include <linux/of_device.h>
26
27#include <asm/irq.h>
28
29struct i2c_pca_pf_data {
30 void __iomem *reg_base;
31 int irq; /* if 0, use polling */
32 struct gpio_desc *gpio;
33 wait_queue_head_t wait;
34 struct i2c_adapter adap;
35 struct i2c_algo_pca_data algo_data;
36 unsigned long io_base;
37 unsigned long io_size;
38};
39
40/* Read/Write functions for different register alignments */
41
42static int i2c_pca_pf_readbyte8(void *pd, int reg)
43{
44 struct i2c_pca_pf_data *i2c = pd;
45 return ioread8(i2c->reg_base + reg);
46}
47
48static int i2c_pca_pf_readbyte16(void *pd, int reg)
49{
50 struct i2c_pca_pf_data *i2c = pd;
51 return ioread8(i2c->reg_base + reg * 2);
52}
53
54static int i2c_pca_pf_readbyte32(void *pd, int reg)
55{
56 struct i2c_pca_pf_data *i2c = pd;
57 return ioread8(i2c->reg_base + reg * 4);
58}
59
60static void i2c_pca_pf_writebyte8(void *pd, int reg, int val)
61{
62 struct i2c_pca_pf_data *i2c = pd;
63 iowrite8(val, i2c->reg_base + reg);
64}
65
66static void i2c_pca_pf_writebyte16(void *pd, int reg, int val)
67{
68 struct i2c_pca_pf_data *i2c = pd;
69 iowrite8(val, i2c->reg_base + reg * 2);
70}
71
72static void i2c_pca_pf_writebyte32(void *pd, int reg, int val)
73{
74 struct i2c_pca_pf_data *i2c = pd;
75 iowrite8(val, i2c->reg_base + reg * 4);
76}
77
78
79static int i2c_pca_pf_waitforcompletion(void *pd)
80{
81 struct i2c_pca_pf_data *i2c = pd;
82 unsigned long timeout;
83 long ret;
84
85 if (i2c->irq) {
86 ret = wait_event_timeout(i2c->wait,
87 i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
88 & I2C_PCA_CON_SI, i2c->adap.timeout);
89 } else {
90 /* Do polling */
91 timeout = jiffies + i2c->adap.timeout;
92 do {
93 ret = time_before(jiffies, timeout);
94 if (i2c->algo_data.read_byte(i2c, I2C_PCA_CON)
95 & I2C_PCA_CON_SI)
96 break;
97 udelay(100);
98 } while (ret);
99 }
100
101 return ret > 0;
102}
103
104static void i2c_pca_pf_dummyreset(void *pd)
105{
106 struct i2c_pca_pf_data *i2c = pd;
107
108 dev_warn(&i2c->adap.dev, "No reset-pin found. Chip may get stuck!\n");
109}
110
111static void i2c_pca_pf_resetchip(void *pd)
112{
113 struct i2c_pca_pf_data *i2c = pd;
114
115 gpiod_set_value(i2c->gpio, 1);
116 ndelay(100);
117 gpiod_set_value(i2c->gpio, 0);
118}
119
120static irqreturn_t i2c_pca_pf_handler(int this_irq, void *dev_id)
121{
122 struct i2c_pca_pf_data *i2c = dev_id;
123
124 if ((i2c->algo_data.read_byte(i2c, I2C_PCA_CON) & I2C_PCA_CON_SI) == 0)
125 return IRQ_NONE;
126
127 wake_up(&i2c->wait);
128
129 return IRQ_HANDLED;
130}
131
132
133static int i2c_pca_pf_probe(struct platform_device *pdev)
134{
135 struct i2c_pca_pf_data *i2c;
136 struct resource *res;
137 struct i2c_pca9564_pf_platform_data *platform_data =
138 dev_get_platdata(&pdev->dev);
139 struct device_node *np = pdev->dev.of_node;
140 int ret = 0;
141 int irq;
142
143 irq = platform_get_irq(pdev, 0);
144 /* If irq is 0, we do polling. */
145 if (irq < 0)
146 irq = 0;
147
148 i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
149 if (!i2c)
150 return -ENOMEM;
151
152 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
153 i2c->reg_base = devm_ioremap_resource(&pdev->dev, res);
154 if (IS_ERR(i2c->reg_base))
155 return PTR_ERR(i2c->reg_base);
156
157
158 init_waitqueue_head(&i2c->wait);
159
160 i2c->io_base = res->start;
161 i2c->io_size = resource_size(res);
162 i2c->irq = irq;
163
164 i2c->adap.nr = pdev->id;
165 i2c->adap.owner = THIS_MODULE;
166 snprintf(i2c->adap.name, sizeof(i2c->adap.name),
167 "PCA9564/PCA9665 at 0x%08lx",
168 (unsigned long) res->start);
169 i2c->adap.algo_data = &i2c->algo_data;
170 i2c->adap.dev.parent = &pdev->dev;
171 i2c->adap.dev.of_node = np;
172
173 i2c->gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
174 if (IS_ERR(i2c->gpio))
175 return PTR_ERR(i2c->gpio);
176
177 i2c->adap.timeout = HZ;
178 ret = device_property_read_u32(&pdev->dev, "clock-frequency",
179 &i2c->algo_data.i2c_clock);
180 if (ret)
181 i2c->algo_data.i2c_clock = 59000;
182
183 if (platform_data) {
184 i2c->adap.timeout = platform_data->timeout;
185 i2c->algo_data.i2c_clock = platform_data->i2c_clock_speed;
186 }
187
188 i2c->algo_data.data = i2c;
189 i2c->algo_data.wait_for_completion = i2c_pca_pf_waitforcompletion;
190 if (i2c->gpio)
191 i2c->algo_data.reset_chip = i2c_pca_pf_resetchip;
192 else
193 i2c->algo_data.reset_chip = i2c_pca_pf_dummyreset;
194
195 switch (res->flags & IORESOURCE_MEM_TYPE_MASK) {
196 case IORESOURCE_MEM_32BIT:
197 i2c->algo_data.write_byte = i2c_pca_pf_writebyte32;
198 i2c->algo_data.read_byte = i2c_pca_pf_readbyte32;
199 break;
200 case IORESOURCE_MEM_16BIT:
201 i2c->algo_data.write_byte = i2c_pca_pf_writebyte16;
202 i2c->algo_data.read_byte = i2c_pca_pf_readbyte16;
203 break;
204 case IORESOURCE_MEM_8BIT:
205 default:
206 i2c->algo_data.write_byte = i2c_pca_pf_writebyte8;
207 i2c->algo_data.read_byte = i2c_pca_pf_readbyte8;
208 break;
209 }
210
211 if (irq) {
212 ret = devm_request_irq(&pdev->dev, irq, i2c_pca_pf_handler,
213 IRQF_TRIGGER_FALLING, pdev->name, i2c);
214 if (ret)
215 return ret;
216 }
217
218 ret = i2c_pca_add_numbered_bus(&i2c->adap);
219 if (ret)
220 return ret;
221
222 platform_set_drvdata(pdev, i2c);
223
224 dev_info(&pdev->dev, "registered.\n");
225
226 return 0;
227}
228
229static int i2c_pca_pf_remove(struct platform_device *pdev)
230{
231 struct i2c_pca_pf_data *i2c = platform_get_drvdata(pdev);
232
233 i2c_del_adapter(&i2c->adap);
234
235 return 0;
236}
237
238#ifdef CONFIG_OF
239static const struct of_device_id i2c_pca_of_match_table[] = {
240 { .compatible = "nxp,pca9564" },
241 { .compatible = "nxp,pca9665" },
242 {},
243};
244MODULE_DEVICE_TABLE(of, i2c_pca_of_match_table);
245#endif
246
247static struct platform_driver i2c_pca_pf_driver = {
248 .probe = i2c_pca_pf_probe,
249 .remove = i2c_pca_pf_remove,
250 .driver = {
251 .name = "i2c-pca-platform",
252 .of_match_table = of_match_ptr(i2c_pca_of_match_table),
253 },
254};
255
256module_platform_driver(i2c_pca_pf_driver);
257
258MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
259MODULE_DESCRIPTION("I2C-PCA9564/PCA9665 platform driver");
260MODULE_LICENSE("GPL");