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e789995d VK |
1 | /* |
2 | * ST Microelectronics MFD: stmpe's spi client specific driver | |
3 | * | |
4 | * Copyright (C) ST Microelectronics SA 2011 | |
5 | * | |
6 | * License Terms: GNU General Public License, version 2 | |
10d8935f | 7 | * Author: Viresh Kumar <viresh.linux@gmail.com> for ST Microelectronics |
e789995d VK |
8 | */ |
9 | ||
10 | #include <linux/spi/spi.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/types.h> | |
15 | #include "stmpe.h" | |
16 | ||
17 | #define READ_CMD (1 << 7) | |
18 | ||
19 | static int spi_reg_read(struct stmpe *stmpe, u8 reg) | |
20 | { | |
21 | struct spi_device *spi = stmpe->client; | |
22 | int status = spi_w8r16(spi, reg | READ_CMD); | |
23 | ||
24 | return (status < 0) ? status : status >> 8; | |
25 | } | |
26 | ||
27 | static int spi_reg_write(struct stmpe *stmpe, u8 reg, u8 val) | |
28 | { | |
29 | struct spi_device *spi = stmpe->client; | |
30 | u16 cmd = (val << 8) | reg; | |
31 | ||
32 | return spi_write(spi, (const u8 *)&cmd, 2); | |
33 | } | |
34 | ||
35 | static int spi_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values) | |
36 | { | |
37 | int ret, i; | |
38 | ||
39 | for (i = 0; i < length; i++) { | |
40 | ret = spi_reg_read(stmpe, reg + i); | |
41 | if (ret < 0) | |
42 | return ret; | |
43 | *(values + i) = ret; | |
44 | } | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static int spi_block_write(struct stmpe *stmpe, u8 reg, u8 length, | |
50 | const u8 *values) | |
51 | { | |
52 | int ret = 0, i; | |
53 | ||
54 | for (i = length; i > 0; i--, reg++) { | |
55 | ret = spi_reg_write(stmpe, reg, *(values + i - 1)); | |
56 | if (ret < 0) | |
57 | return ret; | |
58 | } | |
59 | ||
60 | return ret; | |
61 | } | |
62 | ||
63 | static void spi_init(struct stmpe *stmpe) | |
64 | { | |
65 | struct spi_device *spi = stmpe->client; | |
66 | ||
67 | spi->bits_per_word = 8; | |
68 | ||
69 | /* This register is only present for stmpe811 */ | |
70 | if (stmpe->variant->id_val == 0x0811) | |
71 | spi_reg_write(stmpe, STMPE811_REG_SPI_CFG, spi->mode); | |
72 | ||
73 | if (spi_setup(spi) < 0) | |
74 | dev_dbg(&spi->dev, "spi_setup failed\n"); | |
75 | } | |
76 | ||
77 | static struct stmpe_client_info spi_ci = { | |
78 | .read_byte = spi_reg_read, | |
79 | .write_byte = spi_reg_write, | |
80 | .read_block = spi_block_read, | |
81 | .write_block = spi_block_write, | |
82 | .init = spi_init, | |
83 | }; | |
84 | ||
f791be49 | 85 | static int |
e789995d VK |
86 | stmpe_spi_probe(struct spi_device *spi) |
87 | { | |
88 | const struct spi_device_id *id = spi_get_device_id(spi); | |
89 | ||
90 | /* don't exceed max specified rate - 1MHz - Limitation of STMPE */ | |
91 | if (spi->max_speed_hz > 1000000) { | |
92 | dev_dbg(&spi->dev, "f(sample) %d KHz?\n", | |
93 | (spi->max_speed_hz/1000)); | |
94 | return -EINVAL; | |
95 | } | |
96 | ||
97 | spi_ci.irq = spi->irq; | |
98 | spi_ci.client = spi; | |
99 | spi_ci.dev = &spi->dev; | |
100 | ||
101 | return stmpe_probe(&spi_ci, id->driver_data); | |
102 | } | |
103 | ||
4740f73f | 104 | static int stmpe_spi_remove(struct spi_device *spi) |
e789995d VK |
105 | { |
106 | struct stmpe *stmpe = dev_get_drvdata(&spi->dev); | |
107 | ||
108 | return stmpe_remove(stmpe); | |
109 | } | |
110 | ||
111 | static const struct spi_device_id stmpe_spi_id[] = { | |
1cda2394 | 112 | { "stmpe610", STMPE610 }, |
7f7f4ea1 | 113 | { "stmpe801", STMPE801 }, |
e789995d VK |
114 | { "stmpe811", STMPE811 }, |
115 | { "stmpe1601", STMPE1601 }, | |
116 | { "stmpe2401", STMPE2401 }, | |
117 | { "stmpe2403", STMPE2403 }, | |
118 | { } | |
119 | }; | |
120 | MODULE_DEVICE_TABLE(spi, stmpe_id); | |
121 | ||
122 | static struct spi_driver stmpe_spi_driver = { | |
123 | .driver = { | |
124 | .name = "stmpe-spi", | |
e789995d VK |
125 | .owner = THIS_MODULE, |
126 | #ifdef CONFIG_PM | |
127 | .pm = &stmpe_dev_pm_ops, | |
128 | #endif | |
129 | }, | |
130 | .probe = stmpe_spi_probe, | |
84449216 | 131 | .remove = stmpe_spi_remove, |
e789995d VK |
132 | .id_table = stmpe_spi_id, |
133 | }; | |
134 | ||
135 | static int __init stmpe_init(void) | |
136 | { | |
137 | return spi_register_driver(&stmpe_spi_driver); | |
138 | } | |
139 | subsys_initcall(stmpe_init); | |
140 | ||
141 | static void __exit stmpe_exit(void) | |
142 | { | |
143 | spi_unregister_driver(&stmpe_spi_driver); | |
144 | } | |
145 | module_exit(stmpe_exit); | |
146 | ||
147 | MODULE_LICENSE("GPL v2"); | |
148 | MODULE_DESCRIPTION("STMPE MFD SPI Interface Driver"); | |
10d8935f | 149 | MODULE_AUTHOR("Viresh Kumar <viresh.linux@gmail.com>"); |