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8b7c3b68 RS |
1 | /* |
2 | * NXP ISP1301 USB transceiver driver | |
3 | * | |
4 | * Copyright (C) 2012 Roland Stigge | |
5 | * | |
6 | * Author: Roland Stigge <stigge@antcom.de> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
790d3a5a | 14 | #include <linux/mutex.h> |
8b7c3b68 | 15 | #include <linux/i2c.h> |
790d3a5a | 16 | #include <linux/usb/phy.h> |
c38a4f3f | 17 | #include <linux/usb/isp1301.h> |
8b7c3b68 RS |
18 | |
19 | #define DRV_NAME "isp1301" | |
20 | ||
790d3a5a FB |
21 | struct isp1301 { |
22 | struct usb_phy phy; | |
23 | struct mutex mutex; | |
24 | ||
25 | struct i2c_client *client; | |
26 | }; | |
27 | ||
c38a4f3f FB |
28 | #define phy_to_isp(p) (container_of((p), struct isp1301, phy)) |
29 | ||
8b7c3b68 RS |
30 | static const struct i2c_device_id isp1301_id[] = { |
31 | { "isp1301", 0 }, | |
32 | { } | |
33 | }; | |
8fb7ab50 | 34 | MODULE_DEVICE_TABLE(i2c, isp1301_id); |
8b7c3b68 | 35 | |
fd567653 JMC |
36 | static const struct of_device_id isp1301_of_match[] = { |
37 | {.compatible = "nxp,isp1301" }, | |
38 | { }, | |
39 | }; | |
40 | MODULE_DEVICE_TABLE(of, isp1301_of_match); | |
41 | ||
8b7c3b68 RS |
42 | static struct i2c_client *isp1301_i2c_client; |
43 | ||
c38a4f3f FB |
44 | static int __isp1301_write(struct isp1301 *isp, u8 reg, u8 value, u8 clear) |
45 | { | |
46 | return i2c_smbus_write_byte_data(isp->client, reg | clear, value); | |
47 | } | |
48 | ||
49 | static int isp1301_write(struct isp1301 *isp, u8 reg, u8 value) | |
50 | { | |
51 | return __isp1301_write(isp, reg, value, 0); | |
52 | } | |
53 | ||
54 | static int isp1301_clear(struct isp1301 *isp, u8 reg, u8 value) | |
55 | { | |
56 | return __isp1301_write(isp, reg, value, ISP1301_I2C_REG_CLEAR_ADDR); | |
57 | } | |
58 | ||
59 | static int isp1301_phy_init(struct usb_phy *phy) | |
60 | { | |
61 | struct isp1301 *isp = phy_to_isp(phy); | |
62 | ||
63 | /* Disable transparent UART mode first */ | |
64 | isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_UART_EN); | |
65 | isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_1, ~MC1_SPEED_REG); | |
66 | isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_SPEED_REG); | |
67 | isp1301_clear(isp, ISP1301_I2C_MODE_CONTROL_2, ~0); | |
68 | isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_2, (MC2_BI_DI | MC2_PSW_EN | |
69 | | MC2_SPD_SUSP_CTRL)); | |
70 | ||
71 | isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, ~0); | |
72 | isp1301_write(isp, ISP1301_I2C_MODE_CONTROL_1, MC1_DAT_SE0); | |
73 | isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLDOWN | |
74 | | OTG1_DP_PULLDOWN)); | |
75 | isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, (OTG1_DM_PULLUP | |
76 | | OTG1_DP_PULLUP)); | |
77 | ||
78 | /* mask all interrupts */ | |
79 | isp1301_clear(isp, ISP1301_I2C_INTERRUPT_LATCH, ~0); | |
80 | isp1301_clear(isp, ISP1301_I2C_INTERRUPT_FALLING, ~0); | |
81 | isp1301_clear(isp, ISP1301_I2C_INTERRUPT_RISING, ~0); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int isp1301_phy_set_vbus(struct usb_phy *phy, int on) | |
87 | { | |
88 | struct isp1301 *isp = phy_to_isp(phy); | |
89 | ||
90 | if (on) | |
91 | isp1301_write(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV); | |
92 | else | |
93 | isp1301_clear(isp, ISP1301_I2C_OTG_CONTROL_1, OTG1_VBUS_DRV); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | ||
8b7c3b68 RS |
98 | static int isp1301_probe(struct i2c_client *client, |
99 | const struct i2c_device_id *i2c_id) | |
100 | { | |
790d3a5a FB |
101 | struct isp1301 *isp; |
102 | struct usb_phy *phy; | |
103 | ||
104 | isp = devm_kzalloc(&client->dev, sizeof(*isp), GFP_KERNEL); | |
105 | if (!isp) | |
106 | return -ENOMEM; | |
107 | ||
108 | isp->client = client; | |
109 | mutex_init(&isp->mutex); | |
110 | ||
111 | phy = &isp->phy; | |
1abd8b31 | 112 | phy->dev = &client->dev; |
790d3a5a | 113 | phy->label = DRV_NAME; |
c38a4f3f FB |
114 | phy->init = isp1301_phy_init; |
115 | phy->set_vbus = isp1301_phy_set_vbus; | |
790d3a5a FB |
116 | phy->type = USB_PHY_TYPE_USB2; |
117 | ||
118 | i2c_set_clientdata(client, isp); | |
119 | usb_add_phy_dev(phy); | |
120 | ||
8b7c3b68 | 121 | isp1301_i2c_client = client; |
790d3a5a | 122 | |
8b7c3b68 RS |
123 | return 0; |
124 | } | |
125 | ||
126 | static int isp1301_remove(struct i2c_client *client) | |
127 | { | |
790d3a5a FB |
128 | struct isp1301 *isp = i2c_get_clientdata(client); |
129 | ||
130 | usb_remove_phy(&isp->phy); | |
131 | isp1301_i2c_client = NULL; | |
132 | ||
8b7c3b68 RS |
133 | return 0; |
134 | } | |
135 | ||
136 | static struct i2c_driver isp1301_driver = { | |
137 | .driver = { | |
138 | .name = DRV_NAME, | |
a7f12a21 | 139 | .of_match_table = isp1301_of_match, |
8b7c3b68 RS |
140 | }, |
141 | .probe = isp1301_probe, | |
142 | .remove = isp1301_remove, | |
143 | .id_table = isp1301_id, | |
144 | }; | |
145 | ||
146 | module_i2c_driver(isp1301_driver); | |
147 | ||
148 | static int match(struct device *dev, void *data) | |
149 | { | |
150 | struct device_node *node = (struct device_node *)data; | |
151 | return (dev->of_node == node) && | |
152 | (dev->driver == &isp1301_driver.driver); | |
153 | } | |
154 | ||
155 | struct i2c_client *isp1301_get_client(struct device_node *node) | |
156 | { | |
157 | if (node) { /* reference of ISP1301 I2C node via DT */ | |
158 | struct device *dev = bus_find_device(&i2c_bus_type, NULL, | |
159 | node, match); | |
160 | if (!dev) | |
161 | return NULL; | |
162 | return to_i2c_client(dev); | |
163 | } else { /* non-DT: only one ISP1301 chip supported */ | |
164 | return isp1301_i2c_client; | |
165 | } | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(isp1301_get_client); | |
168 | ||
169 | MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>"); | |
170 | MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver"); | |
171 | MODULE_LICENSE("GPL"); |