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1da177e4 LT |
1 | /* |
2 | * i2c-pca-isa.c driver for PCA9564 on ISA boards | |
3 | * Copyright (C) 2004 Arcom Control Systems | |
c01b0831 | 4 | * Copyright (C) 2008 Pengutronix |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
1da177e4 LT |
15 | */ |
16 | ||
1da177e4 LT |
17 | #include <linux/kernel.h> |
18 | #include <linux/ioport.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/moduleparam.h> | |
21 | #include <linux/delay.h> | |
2378bc09 | 22 | #include <linux/jiffies.h> |
1da177e4 LT |
23 | #include <linux/init.h> |
24 | #include <linux/interrupt.h> | |
1da177e4 | 25 | #include <linux/wait.h> |
5cedb05d | 26 | #include <linux/isa.h> |
1da177e4 LT |
27 | #include <linux/i2c.h> |
28 | #include <linux/i2c-algo-pca.h> | |
21782180 | 29 | #include <linux/io.h> |
1da177e4 | 30 | |
1da177e4 LT |
31 | #include <asm/irq.h> |
32 | ||
c01b0831 | 33 | #define DRIVER "i2c-pca-isa" |
1da177e4 LT |
34 | #define IO_SIZE 4 |
35 | ||
ce564033 RH |
36 | static unsigned long base; |
37 | static int irq = -1; | |
1da177e4 LT |
38 | |
39 | /* Data sheet recommends 59kHz for 100kHz operation due to variation | |
40 | * in the actual clock rate */ | |
eff9ec95 | 41 | static int clock = 59000; |
1da177e4 | 42 | |
2378bc09 | 43 | static struct i2c_adapter pca_isa_ops; |
1da177e4 LT |
44 | static wait_queue_head_t pca_wait; |
45 | ||
c01b0831 | 46 | static void pca_isa_writebyte(void *pd, int reg, int val) |
1da177e4 LT |
47 | { |
48 | #ifdef DEBUG_IO | |
49 | static char *names[] = { "T/O", "DAT", "ADR", "CON" }; | |
154d22b0 FS |
50 | printk(KERN_DEBUG "*** write %s at %#lx <= %#04x\n", names[reg], |
51 | base+reg, val); | |
1da177e4 LT |
52 | #endif |
53 | outb(val, base+reg); | |
54 | } | |
55 | ||
c01b0831 | 56 | static int pca_isa_readbyte(void *pd, int reg) |
1da177e4 LT |
57 | { |
58 | int res = inb(base+reg); | |
59 | #ifdef DEBUG_IO | |
60 | { | |
3d438291 | 61 | static char *names[] = { "STA", "DAT", "ADR", "CON" }; |
154d22b0 | 62 | printk(KERN_DEBUG "*** read %s => %#04x\n", names[reg], res); |
1da177e4 LT |
63 | } |
64 | #endif | |
65 | return res; | |
66 | } | |
67 | ||
c01b0831 | 68 | static int pca_isa_waitforcompletion(void *pd) |
1da177e4 | 69 | { |
2378bc09 | 70 | unsigned long timeout; |
6abb930a | 71 | long ret; |
1da177e4 LT |
72 | |
73 | if (irq > -1) { | |
22f8b269 | 74 | ret = wait_event_timeout(pca_wait, |
2378bc09 WS |
75 | pca_isa_readbyte(pd, I2C_PCA_CON) |
76 | & I2C_PCA_CON_SI, pca_isa_ops.timeout); | |
1da177e4 | 77 | } else { |
2378bc09 WS |
78 | /* Do polling */ |
79 | timeout = jiffies + pca_isa_ops.timeout; | |
6abb930a YY |
80 | do { |
81 | ret = time_before(jiffies, timeout); | |
82 | if (pca_isa_readbyte(pd, I2C_PCA_CON) | |
83 | & I2C_PCA_CON_SI) | |
84 | break; | |
1da177e4 | 85 | udelay(100); |
6abb930a | 86 | } while (ret); |
1da177e4 | 87 | } |
6abb930a | 88 | |
2378bc09 | 89 | return ret > 0; |
1da177e4 LT |
90 | } |
91 | ||
c01b0831 WS |
92 | static void pca_isa_resetchip(void *pd) |
93 | { | |
94 | /* apparently only an external reset will do it. not a lot can be done */ | |
95 | printk(KERN_WARNING DRIVER ": Haven't figured out how to do a reset yet\n"); | |
96 | } | |
97 | ||
7d12e780 | 98 | static irqreturn_t pca_handler(int this_irq, void *dev_id) { |
22f8b269 | 99 | wake_up(&pca_wait); |
1da177e4 LT |
100 | return IRQ_HANDLED; |
101 | } | |
102 | ||
103 | static struct i2c_algo_pca_data pca_isa_data = { | |
c01b0831 | 104 | /* .data intentionally left NULL, not needed with ISA */ |
1da177e4 LT |
105 | .write_byte = pca_isa_writebyte, |
106 | .read_byte = pca_isa_readbyte, | |
c01b0831 WS |
107 | .wait_for_completion = pca_isa_waitforcompletion, |
108 | .reset_chip = pca_isa_resetchip, | |
1da177e4 LT |
109 | }; |
110 | ||
111 | static struct i2c_adapter pca_isa_ops = { | |
112 | .owner = THIS_MODULE, | |
1da177e4 | 113 | .algo_data = &pca_isa_data, |
eff9ec95 | 114 | .name = "PCA9564/PCA9665 ISA Adapter", |
8e99ada8 | 115 | .timeout = HZ, |
1da177e4 LT |
116 | }; |
117 | ||
0b255e92 | 118 | static int pca_isa_match(struct device *dev, unsigned int id) |
ce564033 RH |
119 | { |
120 | int match = base != 0; | |
121 | ||
122 | if (match) { | |
123 | if (irq <= -1) | |
124 | dev_warn(dev, "Using polling mode (specify irq)\n"); | |
125 | } else | |
126 | dev_err(dev, "Please specify I/O base\n"); | |
127 | ||
128 | return match; | |
129 | } | |
130 | ||
0b255e92 | 131 | static int pca_isa_probe(struct device *dev, unsigned int id) |
1da177e4 | 132 | { |
1da177e4 LT |
133 | init_waitqueue_head(&pca_wait); |
134 | ||
5cedb05d | 135 | dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq); |
1da177e4 | 136 | |
68e1ee62 | 137 | #ifdef CONFIG_PPC |
104cb574 CK |
138 | if (check_legacy_ioport(base)) { |
139 | dev_err(dev, "I/O address %#08lx is not available\n", base); | |
140 | goto out; | |
141 | } | |
142 | #endif | |
143 | ||
1da177e4 | 144 | if (!request_region(base, IO_SIZE, "i2c-pca-isa")) { |
5cedb05d | 145 | dev_err(dev, "I/O address %#08lx is in use\n", base); |
1da177e4 LT |
146 | goto out; |
147 | } | |
148 | ||
149 | if (irq > -1) { | |
150 | if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) { | |
5cedb05d | 151 | dev_err(dev, "Request irq%d failed\n", irq); |
1da177e4 LT |
152 | goto out_region; |
153 | } | |
154 | } | |
155 | ||
c01b0831 | 156 | pca_isa_data.i2c_clock = clock; |
1da177e4 | 157 | if (i2c_pca_add_bus(&pca_isa_ops) < 0) { |
5cedb05d | 158 | dev_err(dev, "Failed to add i2c bus\n"); |
1da177e4 LT |
159 | goto out_irq; |
160 | } | |
161 | ||
162 | return 0; | |
163 | ||
164 | out_irq: | |
165 | if (irq > -1) | |
166 | free_irq(irq, &pca_isa_ops); | |
167 | out_region: | |
168 | release_region(base, IO_SIZE); | |
169 | out: | |
170 | return -ENODEV; | |
171 | } | |
172 | ||
0b255e92 | 173 | static int pca_isa_remove(struct device *dev, unsigned int id) |
1da177e4 | 174 | { |
3269711b | 175 | i2c_del_adapter(&pca_isa_ops); |
1da177e4 | 176 | |
ce564033 | 177 | if (irq > -1) { |
1da177e4 LT |
178 | disable_irq(irq); |
179 | free_irq(irq, &pca_isa_ops); | |
180 | } | |
181 | release_region(base, IO_SIZE); | |
5cedb05d JD |
182 | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static struct isa_driver pca_isa_driver = { | |
ce564033 | 187 | .match = pca_isa_match, |
5cedb05d | 188 | .probe = pca_isa_probe, |
0b255e92 | 189 | .remove = pca_isa_remove, |
5cedb05d JD |
190 | .driver = { |
191 | .owner = THIS_MODULE, | |
c01b0831 | 192 | .name = DRIVER, |
5cedb05d JD |
193 | } |
194 | }; | |
195 | ||
196 | static int __init pca_isa_init(void) | |
197 | { | |
198 | return isa_register_driver(&pca_isa_driver, 1); | |
199 | } | |
200 | ||
201 | static void __exit pca_isa_exit(void) | |
202 | { | |
203 | isa_unregister_driver(&pca_isa_driver); | |
1da177e4 LT |
204 | } |
205 | ||
206 | MODULE_AUTHOR("Ian Campbell <icampbell@arcom.com>"); | |
eff9ec95 | 207 | MODULE_DESCRIPTION("ISA base PCA9564/PCA9665 driver"); |
1da177e4 LT |
208 | MODULE_LICENSE("GPL"); |
209 | ||
210 | module_param(base, ulong, 0); | |
211 | MODULE_PARM_DESC(base, "I/O base address"); | |
212 | ||
213 | module_param(irq, int, 0); | |
214 | MODULE_PARM_DESC(irq, "IRQ"); | |
215 | module_param(clock, int, 0); | |
eff9ec95 MAC |
216 | MODULE_PARM_DESC(clock, "Clock rate in hertz.\n\t\t" |
217 | "For PCA9564: 330000,288000,217000,146000," | |
218 | "88000,59000,44000,36000\n" | |
219 | "\t\tFor PCA9665:\tStandard: 60300 - 100099\n" | |
220 | "\t\t\t\tFast: 100100 - 400099\n" | |
221 | "\t\t\t\tFast+: 400100 - 10000099\n" | |
222 | "\t\t\t\tTurbo: Up to 1265800"); | |
1da177e4 | 223 | |
1da177e4 LT |
224 | module_init(pca_isa_init); |
225 | module_exit(pca_isa_exit); |